1 /*
2 * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink Multiport
5 * high speed multiprotocol serial adapter.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 * This code is released under the GNU General Public License (GPL)
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25 * OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 # define BREAKPOINT() asm(" int $3");
31 #else
32 # define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/seq_file.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60
61 #include <asm/io.h>
62 #include <asm/irq.h>
63 #include <asm/dma.h>
64 #include <linux/bitops.h>
65 #include <asm/types.h>
66 #include <linux/termios.h>
67 #include <linux/workqueue.h>
68 #include <linux/hdlc.h>
69 #include <linux/synclink.h>
70
71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
72 #define SYNCLINK_GENERIC_HDLC 1
73 #else
74 #define SYNCLINK_GENERIC_HDLC 0
75 #endif
76
77 #define GET_USER(error,value,addr) error = get_user(value,addr)
78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
81
82 #include <asm/uaccess.h>
83
84 static MGSL_PARAMS default_params = {
85 MGSL_MODE_HDLC, /* unsigned long mode */
86 0, /* unsigned char loopback; */
87 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
88 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
89 0, /* unsigned long clock_speed; */
90 0xff, /* unsigned char addr_filter; */
91 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
92 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
93 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
94 9600, /* unsigned long data_rate; */
95 8, /* unsigned char data_bits; */
96 1, /* unsigned char stop_bits; */
97 ASYNC_PARITY_NONE /* unsigned char parity; */
98 };
99
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE 1024
102 #define SCA_MEM_SIZE 0x40000
103 #define SCA_BASE_SIZE 512
104 #define SCA_REG_SIZE 16
105 #define SCA_MAX_PORTS 4
106 #define SCAMAXDESC 128
107
108 #define BUFFERLISTSIZE 4096
109
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113 u16 next; /* lower l6 bits of next descriptor addr */
114 u16 buf_ptr; /* lower 16 bits of buffer addr */
115 u8 buf_base; /* upper 8 bits of buffer addr */
116 u8 pad1;
117 u16 length; /* length of buffer */
118 u8 status; /* status of buffer */
119 u8 pad2;
120 } SCADESC, *PSCADESC;
121
122 typedef struct _SCADESC_EX
123 {
124 /* device driver bookkeeping section */
125 char *virt_addr; /* virtual address of data buffer */
126 u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128
129 /* The queue of BH actions to be performed */
130
131 #define BH_RECEIVE 1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS 4
134
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136
137 struct _input_signal_events {
138 int ri_up;
139 int ri_down;
140 int dsr_up;
141 int dsr_down;
142 int dcd_up;
143 int dcd_down;
144 int cts_up;
145 int cts_down;
146 };
147
148 /*
149 * Device instance data structure
150 */
151 typedef struct _synclinkmp_info {
152 void *if_ptr; /* General purpose pointer (used by SPPP) */
153 int magic;
154 struct tty_port port;
155 int line;
156 unsigned short close_delay;
157 unsigned short closing_wait; /* time to wait before closing */
158
159 struct mgsl_icount icount;
160
161 int timeout;
162 int x_char; /* xon/xoff character */
163 u16 read_status_mask1; /* break detection (SR1 indications) */
164 u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
165 unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
166 unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
167 unsigned char *tx_buf;
168 int tx_put;
169 int tx_get;
170 int tx_count;
171
172 wait_queue_head_t status_event_wait_q;
173 wait_queue_head_t event_wait_q;
174 struct timer_list tx_timer; /* HDLC transmit timeout timer */
175 struct _synclinkmp_info *next_device; /* device list link */
176 struct timer_list status_timer; /* input signal status check timer */
177
178 spinlock_t lock; /* spinlock for synchronizing with ISR */
179 struct work_struct task; /* task structure for scheduling bh */
180
181 u32 max_frame_size; /* as set by device config */
182
183 u32 pending_bh;
184
185 bool bh_running; /* Protection from multiple */
186 int isr_overflow;
187 bool bh_requested;
188
189 int dcd_chkcount; /* check counts to prevent */
190 int cts_chkcount; /* too many IRQs if a signal */
191 int dsr_chkcount; /* is floating */
192 int ri_chkcount;
193
194 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
195 unsigned long buffer_list_phys;
196
197 unsigned int rx_buf_count; /* count of total allocated Rx buffers */
198 SCADESC *rx_buf_list; /* list of receive buffer entries */
199 SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
200 unsigned int current_rx_buf;
201
202 unsigned int tx_buf_count; /* count of total allocated Tx buffers */
203 SCADESC *tx_buf_list; /* list of transmit buffer entries */
204 SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
205 unsigned int last_tx_buf;
206
207 unsigned char *tmp_rx_buf;
208 unsigned int tmp_rx_buf_count;
209
210 bool rx_enabled;
211 bool rx_overflow;
212
213 bool tx_enabled;
214 bool tx_active;
215 u32 idle_mode;
216
217 unsigned char ie0_value;
218 unsigned char ie1_value;
219 unsigned char ie2_value;
220 unsigned char ctrlreg_value;
221 unsigned char old_signals;
222
223 char device_name[25]; /* device instance name */
224
225 int port_count;
226 int adapter_num;
227 int port_num;
228
229 struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
230
231 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
232
233 unsigned int irq_level; /* interrupt level */
234 unsigned long irq_flags;
235 bool irq_requested; /* true if IRQ requested */
236
237 MGSL_PARAMS params; /* communications parameters */
238
239 unsigned char serial_signals; /* current serial signal states */
240
241 bool irq_occurred; /* for diagnostics use */
242 unsigned int init_error; /* Initialization startup error */
243
244 u32 last_mem_alloc;
245 unsigned char* memory_base; /* shared memory address (PCI only) */
246 u32 phys_memory_base;
247 int shared_mem_requested;
248
249 unsigned char* sca_base; /* HD64570 SCA Memory address */
250 u32 phys_sca_base;
251 u32 sca_offset;
252 bool sca_base_requested;
253
254 unsigned char* lcr_base; /* local config registers (PCI only) */
255 u32 phys_lcr_base;
256 u32 lcr_offset;
257 int lcr_mem_requested;
258
259 unsigned char* statctrl_base; /* status/control register memory */
260 u32 phys_statctrl_base;
261 u32 statctrl_offset;
262 bool sca_statctrl_requested;
263
264 u32 misc_ctrl_value;
265 char *flag_buf;
266 bool drop_rts_on_tx_done;
267
268 struct _input_signal_events input_signal_events;
269
270 /* SPPP/Cisco HDLC device parts */
271 int netcount;
272 spinlock_t netlock;
273
274 #if SYNCLINK_GENERIC_HDLC
275 struct net_device *netdev;
276 #endif
277
278 } SLMP_INFO;
279
280 #define MGSL_MAGIC 0x5401
281
282 /*
283 * define serial signal status change macros
284 */
285 #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
286 #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
287 #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
288 #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
289
290 /* Common Register macros */
291 #define LPR 0x00
292 #define PABR0 0x02
293 #define PABR1 0x03
294 #define WCRL 0x04
295 #define WCRM 0x05
296 #define WCRH 0x06
297 #define DPCR 0x08
298 #define DMER 0x09
299 #define ISR0 0x10
300 #define ISR1 0x11
301 #define ISR2 0x12
302 #define IER0 0x14
303 #define IER1 0x15
304 #define IER2 0x16
305 #define ITCR 0x18
306 #define INTVR 0x1a
307 #define IMVR 0x1c
308
309 /* MSCI Register macros */
310 #define TRB 0x20
311 #define TRBL 0x20
312 #define TRBH 0x21
313 #define SR0 0x22
314 #define SR1 0x23
315 #define SR2 0x24
316 #define SR3 0x25
317 #define FST 0x26
318 #define IE0 0x28
319 #define IE1 0x29
320 #define IE2 0x2a
321 #define FIE 0x2b
322 #define CMD 0x2c
323 #define MD0 0x2e
324 #define MD1 0x2f
325 #define MD2 0x30
326 #define CTL 0x31
327 #define SA0 0x32
328 #define SA1 0x33
329 #define IDL 0x34
330 #define TMC 0x35
331 #define RXS 0x36
332 #define TXS 0x37
333 #define TRC0 0x38
334 #define TRC1 0x39
335 #define RRC 0x3a
336 #define CST0 0x3c
337 #define CST1 0x3d
338
339 /* Timer Register Macros */
340 #define TCNT 0x60
341 #define TCNTL 0x60
342 #define TCNTH 0x61
343 #define TCONR 0x62
344 #define TCONRL 0x62
345 #define TCONRH 0x63
346 #define TMCS 0x64
347 #define TEPR 0x65
348
349 /* DMA Controller Register macros */
350 #define DARL 0x80
351 #define DARH 0x81
352 #define DARB 0x82
353 #define BAR 0x80
354 #define BARL 0x80
355 #define BARH 0x81
356 #define BARB 0x82
357 #define SAR 0x84
358 #define SARL 0x84
359 #define SARH 0x85
360 #define SARB 0x86
361 #define CPB 0x86
362 #define CDA 0x88
363 #define CDAL 0x88
364 #define CDAH 0x89
365 #define EDA 0x8a
366 #define EDAL 0x8a
367 #define EDAH 0x8b
368 #define BFL 0x8c
369 #define BFLL 0x8c
370 #define BFLH 0x8d
371 #define BCR 0x8e
372 #define BCRL 0x8e
373 #define BCRH 0x8f
374 #define DSR 0x90
375 #define DMR 0x91
376 #define FCT 0x93
377 #define DIR 0x94
378 #define DCMD 0x95
379
380 /* combine with timer or DMA register address */
381 #define TIMER0 0x00
382 #define TIMER1 0x08
383 #define TIMER2 0x10
384 #define TIMER3 0x18
385 #define RXDMA 0x00
386 #define TXDMA 0x20
387
388 /* SCA Command Codes */
389 #define NOOP 0x00
390 #define TXRESET 0x01
391 #define TXENABLE 0x02
392 #define TXDISABLE 0x03
393 #define TXCRCINIT 0x04
394 #define TXCRCEXCL 0x05
395 #define TXEOM 0x06
396 #define TXABORT 0x07
397 #define MPON 0x08
398 #define TXBUFCLR 0x09
399 #define RXRESET 0x11
400 #define RXENABLE 0x12
401 #define RXDISABLE 0x13
402 #define RXCRCINIT 0x14
403 #define RXREJECT 0x15
404 #define SEARCHMP 0x16
405 #define RXCRCEXCL 0x17
406 #define RXCRCCALC 0x18
407 #define CHRESET 0x21
408 #define HUNT 0x31
409
410 /* DMA command codes */
411 #define SWABORT 0x01
412 #define FEICLEAR 0x02
413
414 /* IE0 */
415 #define TXINTE BIT7
416 #define RXINTE BIT6
417 #define TXRDYE BIT1
418 #define RXRDYE BIT0
419
420 /* IE1 & SR1 */
421 #define UDRN BIT7
422 #define IDLE BIT6
423 #define SYNCD BIT4
424 #define FLGD BIT4
425 #define CCTS BIT3
426 #define CDCD BIT2
427 #define BRKD BIT1
428 #define ABTD BIT1
429 #define GAPD BIT1
430 #define BRKE BIT0
431 #define IDLD BIT0
432
433 /* IE2 & SR2 */
434 #define EOM BIT7
435 #define PMP BIT6
436 #define SHRT BIT6
437 #define PE BIT5
438 #define ABT BIT5
439 #define FRME BIT4
440 #define RBIT BIT4
441 #define OVRN BIT3
442 #define CRCE BIT2
443
444
445 /*
446 * Global linked list of SyncLink devices
447 */
448 static SLMP_INFO *synclinkmp_device_list = NULL;
449 static int synclinkmp_adapter_count = -1;
450 static int synclinkmp_device_count = 0;
451
452 /*
453 * Set this param to non-zero to load eax with the
454 * .text section address and breakpoint on module load.
455 * This is useful for use with gdb and add-symbol-file command.
456 */
457 static bool break_on_load = 0;
458
459 /*
460 * Driver major number, defaults to zero to get auto
461 * assigned major number. May be forced as module parameter.
462 */
463 static int ttymajor = 0;
464
465 /*
466 * Array of user specified options for ISA adapters.
467 */
468 static int debug_level = 0;
469 static int maxframe[MAX_DEVICES] = {0,};
470
471 module_param(break_on_load, bool, 0);
472 module_param(ttymajor, int, 0);
473 module_param(debug_level, int, 0);
474 module_param_array(maxframe, int, NULL, 0);
475
476 static char *driver_name = "SyncLink MultiPort driver";
477 static char *driver_version = "$Revision: 4.38 $";
478
479 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
480 static void synclinkmp_remove_one(struct pci_dev *dev);
481
482 static struct pci_device_id synclinkmp_pci_tbl[] = {
483 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
484 { 0, }, /* terminate list */
485 };
486 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
487
488 MODULE_LICENSE("GPL");
489
490 static struct pci_driver synclinkmp_pci_driver = {
491 .name = "synclinkmp",
492 .id_table = synclinkmp_pci_tbl,
493 .probe = synclinkmp_init_one,
494 .remove = synclinkmp_remove_one,
495 };
496
497
498 static struct tty_driver *serial_driver;
499
500 /* number of characters left in xmit buffer before we ask for more */
501 #define WAKEUP_CHARS 256
502
503
504 /* tty callbacks */
505
506 static int open(struct tty_struct *tty, struct file * filp);
507 static void close(struct tty_struct *tty, struct file * filp);
508 static void hangup(struct tty_struct *tty);
509 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
510
511 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
512 static int put_char(struct tty_struct *tty, unsigned char ch);
513 static void send_xchar(struct tty_struct *tty, char ch);
514 static void wait_until_sent(struct tty_struct *tty, int timeout);
515 static int write_room(struct tty_struct *tty);
516 static void flush_chars(struct tty_struct *tty);
517 static void flush_buffer(struct tty_struct *tty);
518 static void tx_hold(struct tty_struct *tty);
519 static void tx_release(struct tty_struct *tty);
520
521 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
522 static int chars_in_buffer(struct tty_struct *tty);
523 static void throttle(struct tty_struct * tty);
524 static void unthrottle(struct tty_struct * tty);
525 static int set_break(struct tty_struct *tty, int break_state);
526
527 #if SYNCLINK_GENERIC_HDLC
528 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
529 static void hdlcdev_tx_done(SLMP_INFO *info);
530 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
531 static int hdlcdev_init(SLMP_INFO *info);
532 static void hdlcdev_exit(SLMP_INFO *info);
533 #endif
534
535 /* ioctl handlers */
536
537 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
538 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
539 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
540 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
541 static int set_txidle(SLMP_INFO *info, int idle_mode);
542 static int tx_enable(SLMP_INFO *info, int enable);
543 static int tx_abort(SLMP_INFO *info);
544 static int rx_enable(SLMP_INFO *info, int enable);
545 static int modem_input_wait(SLMP_INFO *info,int arg);
546 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
547 static int tiocmget(struct tty_struct *tty);
548 static int tiocmset(struct tty_struct *tty,
549 unsigned int set, unsigned int clear);
550 static int set_break(struct tty_struct *tty, int break_state);
551
552 static void add_device(SLMP_INFO *info);
553 static void device_init(int adapter_num, struct pci_dev *pdev);
554 static int claim_resources(SLMP_INFO *info);
555 static void release_resources(SLMP_INFO *info);
556
557 static int startup(SLMP_INFO *info);
558 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
559 static int carrier_raised(struct tty_port *port);
560 static void shutdown(SLMP_INFO *info);
561 static void program_hw(SLMP_INFO *info);
562 static void change_params(SLMP_INFO *info);
563
564 static bool init_adapter(SLMP_INFO *info);
565 static bool register_test(SLMP_INFO *info);
566 static bool irq_test(SLMP_INFO *info);
567 static bool loopback_test(SLMP_INFO *info);
568 static int adapter_test(SLMP_INFO *info);
569 static bool memory_test(SLMP_INFO *info);
570
571 static void reset_adapter(SLMP_INFO *info);
572 static void reset_port(SLMP_INFO *info);
573 static void async_mode(SLMP_INFO *info);
574 static void hdlc_mode(SLMP_INFO *info);
575
576 static void rx_stop(SLMP_INFO *info);
577 static void rx_start(SLMP_INFO *info);
578 static void rx_reset_buffers(SLMP_INFO *info);
579 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
580 static bool rx_get_frame(SLMP_INFO *info);
581
582 static void tx_start(SLMP_INFO *info);
583 static void tx_stop(SLMP_INFO *info);
584 static void tx_load_fifo(SLMP_INFO *info);
585 static void tx_set_idle(SLMP_INFO *info);
586 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
587
588 static void get_signals(SLMP_INFO *info);
589 static void set_signals(SLMP_INFO *info);
590 static void enable_loopback(SLMP_INFO *info, int enable);
591 static void set_rate(SLMP_INFO *info, u32 data_rate);
592
593 static int bh_action(SLMP_INFO *info);
594 static void bh_handler(struct work_struct *work);
595 static void bh_receive(SLMP_INFO *info);
596 static void bh_transmit(SLMP_INFO *info);
597 static void bh_status(SLMP_INFO *info);
598 static void isr_timer(SLMP_INFO *info);
599 static void isr_rxint(SLMP_INFO *info);
600 static void isr_rxrdy(SLMP_INFO *info);
601 static void isr_txint(SLMP_INFO *info);
602 static void isr_txrdy(SLMP_INFO *info);
603 static void isr_rxdmaok(SLMP_INFO *info);
604 static void isr_rxdmaerror(SLMP_INFO *info);
605 static void isr_txdmaok(SLMP_INFO *info);
606 static void isr_txdmaerror(SLMP_INFO *info);
607 static void isr_io_pin(SLMP_INFO *info, u16 status);
608
609 static int alloc_dma_bufs(SLMP_INFO *info);
610 static void free_dma_bufs(SLMP_INFO *info);
611 static int alloc_buf_list(SLMP_INFO *info);
612 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
613 static int alloc_tmp_rx_buf(SLMP_INFO *info);
614 static void free_tmp_rx_buf(SLMP_INFO *info);
615
616 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
617 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
618 static void tx_timeout(unsigned long context);
619 static void status_timeout(unsigned long context);
620
621 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
622 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
623 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
624 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
625 static unsigned char read_status_reg(SLMP_INFO * info);
626 static void write_control_reg(SLMP_INFO * info);
627
628
629 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
630 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
631 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
632
633 static u32 misc_ctrl_value = 0x007e4040;
634 static u32 lcr1_brdr_value = 0x00800028;
635
636 static u32 read_ahead_count = 8;
637
638 /* DPCR, DMA Priority Control
639 *
640 * 07..05 Not used, must be 0
641 * 04 BRC, bus release condition: 0=all transfers complete
642 * 1=release after 1 xfer on all channels
643 * 03 CCC, channel change condition: 0=every cycle
644 * 1=after each channel completes all xfers
645 * 02..00 PR<2..0>, priority 100=round robin
646 *
647 * 00000100 = 0x00
648 */
649 static unsigned char dma_priority = 0x04;
650
651 // Number of bytes that can be written to shared RAM
652 // in a single write operation
653 static u32 sca_pci_load_interval = 64;
654
655 /*
656 * 1st function defined in .text section. Calling this function in
657 * init_module() followed by a breakpoint allows a remote debugger
658 * (gdb) to get the .text address for the add-symbol-file command.
659 * This allows remote debugging of dynamically loadable modules.
660 */
661 static void* synclinkmp_get_text_ptr(void);
synclinkmp_get_text_ptr(void)662 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
663
sanity_check(SLMP_INFO * info,char * name,const char * routine)664 static inline int sanity_check(SLMP_INFO *info,
665 char *name, const char *routine)
666 {
667 #ifdef SANITY_CHECK
668 static const char *badmagic =
669 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
670 static const char *badinfo =
671 "Warning: null synclinkmp_struct for (%s) in %s\n";
672
673 if (!info) {
674 printk(badinfo, name, routine);
675 return 1;
676 }
677 if (info->magic != MGSL_MAGIC) {
678 printk(badmagic, name, routine);
679 return 1;
680 }
681 #else
682 if (!info)
683 return 1;
684 #endif
685 return 0;
686 }
687
688 /**
689 * line discipline callback wrappers
690 *
691 * The wrappers maintain line discipline references
692 * while calling into the line discipline.
693 *
694 * ldisc_receive_buf - pass receive data to line discipline
695 */
696
ldisc_receive_buf(struct tty_struct * tty,const __u8 * data,char * flags,int count)697 static void ldisc_receive_buf(struct tty_struct *tty,
698 const __u8 *data, char *flags, int count)
699 {
700 struct tty_ldisc *ld;
701 if (!tty)
702 return;
703 ld = tty_ldisc_ref(tty);
704 if (ld) {
705 if (ld->ops->receive_buf)
706 ld->ops->receive_buf(tty, data, flags, count);
707 tty_ldisc_deref(ld);
708 }
709 }
710
711 /* tty callbacks */
712
install(struct tty_driver * driver,struct tty_struct * tty)713 static int install(struct tty_driver *driver, struct tty_struct *tty)
714 {
715 SLMP_INFO *info;
716 int line = tty->index;
717
718 if (line >= synclinkmp_device_count) {
719 printk("%s(%d): open with invalid line #%d.\n",
720 __FILE__,__LINE__,line);
721 return -ENODEV;
722 }
723
724 info = synclinkmp_device_list;
725 while (info && info->line != line)
726 info = info->next_device;
727 if (sanity_check(info, tty->name, "open"))
728 return -ENODEV;
729 if (info->init_error) {
730 printk("%s(%d):%s device is not allocated, init error=%d\n",
731 __FILE__, __LINE__, info->device_name,
732 info->init_error);
733 return -ENODEV;
734 }
735
736 tty->driver_data = info;
737
738 return tty_port_install(&info->port, driver, tty);
739 }
740
741 /* Called when a port is opened. Init and enable port.
742 */
open(struct tty_struct * tty,struct file * filp)743 static int open(struct tty_struct *tty, struct file *filp)
744 {
745 SLMP_INFO *info = tty->driver_data;
746 unsigned long flags;
747 int retval;
748
749 info->port.tty = tty;
750
751 if (debug_level >= DEBUG_LEVEL_INFO)
752 printk("%s(%d):%s open(), old ref count = %d\n",
753 __FILE__,__LINE__,tty->driver->name, info->port.count);
754
755 /* If port is closing, signal caller to try again */
756 if (info->port.flags & ASYNC_CLOSING){
757 wait_event_interruptible_tty(tty, info->port.close_wait,
758 !(info->port.flags & ASYNC_CLOSING));
759 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
760 -EAGAIN : -ERESTARTSYS);
761 goto cleanup;
762 }
763
764 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
765
766 spin_lock_irqsave(&info->netlock, flags);
767 if (info->netcount) {
768 retval = -EBUSY;
769 spin_unlock_irqrestore(&info->netlock, flags);
770 goto cleanup;
771 }
772 info->port.count++;
773 spin_unlock_irqrestore(&info->netlock, flags);
774
775 if (info->port.count == 1) {
776 /* 1st open on this device, init hardware */
777 retval = startup(info);
778 if (retval < 0)
779 goto cleanup;
780 }
781
782 retval = block_til_ready(tty, filp, info);
783 if (retval) {
784 if (debug_level >= DEBUG_LEVEL_INFO)
785 printk("%s(%d):%s block_til_ready() returned %d\n",
786 __FILE__,__LINE__, info->device_name, retval);
787 goto cleanup;
788 }
789
790 if (debug_level >= DEBUG_LEVEL_INFO)
791 printk("%s(%d):%s open() success\n",
792 __FILE__,__LINE__, info->device_name);
793 retval = 0;
794
795 cleanup:
796 if (retval) {
797 if (tty->count == 1)
798 info->port.tty = NULL; /* tty layer will release tty struct */
799 if(info->port.count)
800 info->port.count--;
801 }
802
803 return retval;
804 }
805
806 /* Called when port is closed. Wait for remaining data to be
807 * sent. Disable port and free resources.
808 */
close(struct tty_struct * tty,struct file * filp)809 static void close(struct tty_struct *tty, struct file *filp)
810 {
811 SLMP_INFO * info = tty->driver_data;
812
813 if (sanity_check(info, tty->name, "close"))
814 return;
815
816 if (debug_level >= DEBUG_LEVEL_INFO)
817 printk("%s(%d):%s close() entry, count=%d\n",
818 __FILE__,__LINE__, info->device_name, info->port.count);
819
820 if (tty_port_close_start(&info->port, tty, filp) == 0)
821 goto cleanup;
822
823 mutex_lock(&info->port.mutex);
824 if (info->port.flags & ASYNC_INITIALIZED)
825 wait_until_sent(tty, info->timeout);
826
827 flush_buffer(tty);
828 tty_ldisc_flush(tty);
829 shutdown(info);
830 mutex_unlock(&info->port.mutex);
831
832 tty_port_close_end(&info->port, tty);
833 info->port.tty = NULL;
834 cleanup:
835 if (debug_level >= DEBUG_LEVEL_INFO)
836 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
837 tty->driver->name, info->port.count);
838 }
839
840 /* Called by tty_hangup() when a hangup is signaled.
841 * This is the same as closing all open descriptors for the port.
842 */
hangup(struct tty_struct * tty)843 static void hangup(struct tty_struct *tty)
844 {
845 SLMP_INFO *info = tty->driver_data;
846 unsigned long flags;
847
848 if (debug_level >= DEBUG_LEVEL_INFO)
849 printk("%s(%d):%s hangup()\n",
850 __FILE__,__LINE__, info->device_name );
851
852 if (sanity_check(info, tty->name, "hangup"))
853 return;
854
855 mutex_lock(&info->port.mutex);
856 flush_buffer(tty);
857 shutdown(info);
858
859 spin_lock_irqsave(&info->port.lock, flags);
860 info->port.count = 0;
861 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
862 info->port.tty = NULL;
863 spin_unlock_irqrestore(&info->port.lock, flags);
864 mutex_unlock(&info->port.mutex);
865
866 wake_up_interruptible(&info->port.open_wait);
867 }
868
869 /* Set new termios settings
870 */
set_termios(struct tty_struct * tty,struct ktermios * old_termios)871 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
872 {
873 SLMP_INFO *info = tty->driver_data;
874 unsigned long flags;
875
876 if (debug_level >= DEBUG_LEVEL_INFO)
877 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
878 tty->driver->name );
879
880 change_params(info);
881
882 /* Handle transition to B0 status */
883 if (old_termios->c_cflag & CBAUD &&
884 !(tty->termios.c_cflag & CBAUD)) {
885 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
886 spin_lock_irqsave(&info->lock,flags);
887 set_signals(info);
888 spin_unlock_irqrestore(&info->lock,flags);
889 }
890
891 /* Handle transition away from B0 status */
892 if (!(old_termios->c_cflag & CBAUD) &&
893 tty->termios.c_cflag & CBAUD) {
894 info->serial_signals |= SerialSignal_DTR;
895 if (!(tty->termios.c_cflag & CRTSCTS) ||
896 !test_bit(TTY_THROTTLED, &tty->flags)) {
897 info->serial_signals |= SerialSignal_RTS;
898 }
899 spin_lock_irqsave(&info->lock,flags);
900 set_signals(info);
901 spin_unlock_irqrestore(&info->lock,flags);
902 }
903
904 /* Handle turning off CRTSCTS */
905 if (old_termios->c_cflag & CRTSCTS &&
906 !(tty->termios.c_cflag & CRTSCTS)) {
907 tty->hw_stopped = 0;
908 tx_release(tty);
909 }
910 }
911
912 /* Send a block of data
913 *
914 * Arguments:
915 *
916 * tty pointer to tty information structure
917 * buf pointer to buffer containing send data
918 * count size of send data in bytes
919 *
920 * Return Value: number of characters written
921 */
write(struct tty_struct * tty,const unsigned char * buf,int count)922 static int write(struct tty_struct *tty,
923 const unsigned char *buf, int count)
924 {
925 int c, ret = 0;
926 SLMP_INFO *info = tty->driver_data;
927 unsigned long flags;
928
929 if (debug_level >= DEBUG_LEVEL_INFO)
930 printk("%s(%d):%s write() count=%d\n",
931 __FILE__,__LINE__,info->device_name,count);
932
933 if (sanity_check(info, tty->name, "write"))
934 goto cleanup;
935
936 if (!info->tx_buf)
937 goto cleanup;
938
939 if (info->params.mode == MGSL_MODE_HDLC) {
940 if (count > info->max_frame_size) {
941 ret = -EIO;
942 goto cleanup;
943 }
944 if (info->tx_active)
945 goto cleanup;
946 if (info->tx_count) {
947 /* send accumulated data from send_char() calls */
948 /* as frame and wait before accepting more data. */
949 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
950 goto start;
951 }
952 ret = info->tx_count = count;
953 tx_load_dma_buffer(info, buf, count);
954 goto start;
955 }
956
957 for (;;) {
958 c = min_t(int, count,
959 min(info->max_frame_size - info->tx_count - 1,
960 info->max_frame_size - info->tx_put));
961 if (c <= 0)
962 break;
963
964 memcpy(info->tx_buf + info->tx_put, buf, c);
965
966 spin_lock_irqsave(&info->lock,flags);
967 info->tx_put += c;
968 if (info->tx_put >= info->max_frame_size)
969 info->tx_put -= info->max_frame_size;
970 info->tx_count += c;
971 spin_unlock_irqrestore(&info->lock,flags);
972
973 buf += c;
974 count -= c;
975 ret += c;
976 }
977
978 if (info->params.mode == MGSL_MODE_HDLC) {
979 if (count) {
980 ret = info->tx_count = 0;
981 goto cleanup;
982 }
983 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
984 }
985 start:
986 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
987 spin_lock_irqsave(&info->lock,flags);
988 if (!info->tx_active)
989 tx_start(info);
990 spin_unlock_irqrestore(&info->lock,flags);
991 }
992
993 cleanup:
994 if (debug_level >= DEBUG_LEVEL_INFO)
995 printk( "%s(%d):%s write() returning=%d\n",
996 __FILE__,__LINE__,info->device_name,ret);
997 return ret;
998 }
999
1000 /* Add a character to the transmit buffer.
1001 */
put_char(struct tty_struct * tty,unsigned char ch)1002 static int put_char(struct tty_struct *tty, unsigned char ch)
1003 {
1004 SLMP_INFO *info = tty->driver_data;
1005 unsigned long flags;
1006 int ret = 0;
1007
1008 if ( debug_level >= DEBUG_LEVEL_INFO ) {
1009 printk( "%s(%d):%s put_char(%d)\n",
1010 __FILE__,__LINE__,info->device_name,ch);
1011 }
1012
1013 if (sanity_check(info, tty->name, "put_char"))
1014 return 0;
1015
1016 if (!info->tx_buf)
1017 return 0;
1018
1019 spin_lock_irqsave(&info->lock,flags);
1020
1021 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1022 !info->tx_active ) {
1023
1024 if (info->tx_count < info->max_frame_size - 1) {
1025 info->tx_buf[info->tx_put++] = ch;
1026 if (info->tx_put >= info->max_frame_size)
1027 info->tx_put -= info->max_frame_size;
1028 info->tx_count++;
1029 ret = 1;
1030 }
1031 }
1032
1033 spin_unlock_irqrestore(&info->lock,flags);
1034 return ret;
1035 }
1036
1037 /* Send a high-priority XON/XOFF character
1038 */
send_xchar(struct tty_struct * tty,char ch)1039 static void send_xchar(struct tty_struct *tty, char ch)
1040 {
1041 SLMP_INFO *info = tty->driver_data;
1042 unsigned long flags;
1043
1044 if (debug_level >= DEBUG_LEVEL_INFO)
1045 printk("%s(%d):%s send_xchar(%d)\n",
1046 __FILE__,__LINE__, info->device_name, ch );
1047
1048 if (sanity_check(info, tty->name, "send_xchar"))
1049 return;
1050
1051 info->x_char = ch;
1052 if (ch) {
1053 /* Make sure transmit interrupts are on */
1054 spin_lock_irqsave(&info->lock,flags);
1055 if (!info->tx_enabled)
1056 tx_start(info);
1057 spin_unlock_irqrestore(&info->lock,flags);
1058 }
1059 }
1060
1061 /* Wait until the transmitter is empty.
1062 */
wait_until_sent(struct tty_struct * tty,int timeout)1063 static void wait_until_sent(struct tty_struct *tty, int timeout)
1064 {
1065 SLMP_INFO * info = tty->driver_data;
1066 unsigned long orig_jiffies, char_time;
1067
1068 if (!info )
1069 return;
1070
1071 if (debug_level >= DEBUG_LEVEL_INFO)
1072 printk("%s(%d):%s wait_until_sent() entry\n",
1073 __FILE__,__LINE__, info->device_name );
1074
1075 if (sanity_check(info, tty->name, "wait_until_sent"))
1076 return;
1077
1078 if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1079 goto exit;
1080
1081 orig_jiffies = jiffies;
1082
1083 /* Set check interval to 1/5 of estimated time to
1084 * send a character, and make it at least 1. The check
1085 * interval should also be less than the timeout.
1086 * Note: use tight timings here to satisfy the NIST-PCTS.
1087 */
1088
1089 if ( info->params.data_rate ) {
1090 char_time = info->timeout/(32 * 5);
1091 if (!char_time)
1092 char_time++;
1093 } else
1094 char_time = 1;
1095
1096 if (timeout)
1097 char_time = min_t(unsigned long, char_time, timeout);
1098
1099 if ( info->params.mode == MGSL_MODE_HDLC ) {
1100 while (info->tx_active) {
1101 msleep_interruptible(jiffies_to_msecs(char_time));
1102 if (signal_pending(current))
1103 break;
1104 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1105 break;
1106 }
1107 } else {
1108 /*
1109 * TODO: determine if there is something similar to USC16C32
1110 * TXSTATUS_ALL_SENT status
1111 */
1112 while ( info->tx_active && info->tx_enabled) {
1113 msleep_interruptible(jiffies_to_msecs(char_time));
1114 if (signal_pending(current))
1115 break;
1116 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1117 break;
1118 }
1119 }
1120
1121 exit:
1122 if (debug_level >= DEBUG_LEVEL_INFO)
1123 printk("%s(%d):%s wait_until_sent() exit\n",
1124 __FILE__,__LINE__, info->device_name );
1125 }
1126
1127 /* Return the count of free bytes in transmit buffer
1128 */
write_room(struct tty_struct * tty)1129 static int write_room(struct tty_struct *tty)
1130 {
1131 SLMP_INFO *info = tty->driver_data;
1132 int ret;
1133
1134 if (sanity_check(info, tty->name, "write_room"))
1135 return 0;
1136
1137 if (info->params.mode == MGSL_MODE_HDLC) {
1138 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1139 } else {
1140 ret = info->max_frame_size - info->tx_count - 1;
1141 if (ret < 0)
1142 ret = 0;
1143 }
1144
1145 if (debug_level >= DEBUG_LEVEL_INFO)
1146 printk("%s(%d):%s write_room()=%d\n",
1147 __FILE__, __LINE__, info->device_name, ret);
1148
1149 return ret;
1150 }
1151
1152 /* enable transmitter and send remaining buffered characters
1153 */
flush_chars(struct tty_struct * tty)1154 static void flush_chars(struct tty_struct *tty)
1155 {
1156 SLMP_INFO *info = tty->driver_data;
1157 unsigned long flags;
1158
1159 if ( debug_level >= DEBUG_LEVEL_INFO )
1160 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1161 __FILE__,__LINE__,info->device_name,info->tx_count);
1162
1163 if (sanity_check(info, tty->name, "flush_chars"))
1164 return;
1165
1166 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1167 !info->tx_buf)
1168 return;
1169
1170 if ( debug_level >= DEBUG_LEVEL_INFO )
1171 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1172 __FILE__,__LINE__,info->device_name );
1173
1174 spin_lock_irqsave(&info->lock,flags);
1175
1176 if (!info->tx_active) {
1177 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1178 info->tx_count ) {
1179 /* operating in synchronous (frame oriented) mode */
1180 /* copy data from circular tx_buf to */
1181 /* transmit DMA buffer. */
1182 tx_load_dma_buffer(info,
1183 info->tx_buf,info->tx_count);
1184 }
1185 tx_start(info);
1186 }
1187
1188 spin_unlock_irqrestore(&info->lock,flags);
1189 }
1190
1191 /* Discard all data in the send buffer
1192 */
flush_buffer(struct tty_struct * tty)1193 static void flush_buffer(struct tty_struct *tty)
1194 {
1195 SLMP_INFO *info = tty->driver_data;
1196 unsigned long flags;
1197
1198 if (debug_level >= DEBUG_LEVEL_INFO)
1199 printk("%s(%d):%s flush_buffer() entry\n",
1200 __FILE__,__LINE__, info->device_name );
1201
1202 if (sanity_check(info, tty->name, "flush_buffer"))
1203 return;
1204
1205 spin_lock_irqsave(&info->lock,flags);
1206 info->tx_count = info->tx_put = info->tx_get = 0;
1207 del_timer(&info->tx_timer);
1208 spin_unlock_irqrestore(&info->lock,flags);
1209
1210 tty_wakeup(tty);
1211 }
1212
1213 /* throttle (stop) transmitter
1214 */
tx_hold(struct tty_struct * tty)1215 static void tx_hold(struct tty_struct *tty)
1216 {
1217 SLMP_INFO *info = tty->driver_data;
1218 unsigned long flags;
1219
1220 if (sanity_check(info, tty->name, "tx_hold"))
1221 return;
1222
1223 if ( debug_level >= DEBUG_LEVEL_INFO )
1224 printk("%s(%d):%s tx_hold()\n",
1225 __FILE__,__LINE__,info->device_name);
1226
1227 spin_lock_irqsave(&info->lock,flags);
1228 if (info->tx_enabled)
1229 tx_stop(info);
1230 spin_unlock_irqrestore(&info->lock,flags);
1231 }
1232
1233 /* release (start) transmitter
1234 */
tx_release(struct tty_struct * tty)1235 static void tx_release(struct tty_struct *tty)
1236 {
1237 SLMP_INFO *info = tty->driver_data;
1238 unsigned long flags;
1239
1240 if (sanity_check(info, tty->name, "tx_release"))
1241 return;
1242
1243 if ( debug_level >= DEBUG_LEVEL_INFO )
1244 printk("%s(%d):%s tx_release()\n",
1245 __FILE__,__LINE__,info->device_name);
1246
1247 spin_lock_irqsave(&info->lock,flags);
1248 if (!info->tx_enabled)
1249 tx_start(info);
1250 spin_unlock_irqrestore(&info->lock,flags);
1251 }
1252
1253 /* Service an IOCTL request
1254 *
1255 * Arguments:
1256 *
1257 * tty pointer to tty instance data
1258 * cmd IOCTL command code
1259 * arg command argument/context
1260 *
1261 * Return Value: 0 if success, otherwise error code
1262 */
ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1263 static int ioctl(struct tty_struct *tty,
1264 unsigned int cmd, unsigned long arg)
1265 {
1266 SLMP_INFO *info = tty->driver_data;
1267 void __user *argp = (void __user *)arg;
1268
1269 if (debug_level >= DEBUG_LEVEL_INFO)
1270 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1271 info->device_name, cmd );
1272
1273 if (sanity_check(info, tty->name, "ioctl"))
1274 return -ENODEV;
1275
1276 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1277 (cmd != TIOCMIWAIT)) {
1278 if (tty->flags & (1 << TTY_IO_ERROR))
1279 return -EIO;
1280 }
1281
1282 switch (cmd) {
1283 case MGSL_IOCGPARAMS:
1284 return get_params(info, argp);
1285 case MGSL_IOCSPARAMS:
1286 return set_params(info, argp);
1287 case MGSL_IOCGTXIDLE:
1288 return get_txidle(info, argp);
1289 case MGSL_IOCSTXIDLE:
1290 return set_txidle(info, (int)arg);
1291 case MGSL_IOCTXENABLE:
1292 return tx_enable(info, (int)arg);
1293 case MGSL_IOCRXENABLE:
1294 return rx_enable(info, (int)arg);
1295 case MGSL_IOCTXABORT:
1296 return tx_abort(info);
1297 case MGSL_IOCGSTATS:
1298 return get_stats(info, argp);
1299 case MGSL_IOCWAITEVENT:
1300 return wait_mgsl_event(info, argp);
1301 case MGSL_IOCLOOPTXDONE:
1302 return 0; // TODO: Not supported, need to document
1303 /* Wait for modem input (DCD,RI,DSR,CTS) change
1304 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1305 */
1306 case TIOCMIWAIT:
1307 return modem_input_wait(info,(int)arg);
1308
1309 /*
1310 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1311 * Return: write counters to the user passed counter struct
1312 * NB: both 1->0 and 0->1 transitions are counted except for
1313 * RI where only 0->1 is counted.
1314 */
1315 default:
1316 return -ENOIOCTLCMD;
1317 }
1318 return 0;
1319 }
1320
get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)1321 static int get_icount(struct tty_struct *tty,
1322 struct serial_icounter_struct *icount)
1323 {
1324 SLMP_INFO *info = tty->driver_data;
1325 struct mgsl_icount cnow; /* kernel counter temps */
1326 unsigned long flags;
1327
1328 spin_lock_irqsave(&info->lock,flags);
1329 cnow = info->icount;
1330 spin_unlock_irqrestore(&info->lock,flags);
1331
1332 icount->cts = cnow.cts;
1333 icount->dsr = cnow.dsr;
1334 icount->rng = cnow.rng;
1335 icount->dcd = cnow.dcd;
1336 icount->rx = cnow.rx;
1337 icount->tx = cnow.tx;
1338 icount->frame = cnow.frame;
1339 icount->overrun = cnow.overrun;
1340 icount->parity = cnow.parity;
1341 icount->brk = cnow.brk;
1342 icount->buf_overrun = cnow.buf_overrun;
1343
1344 return 0;
1345 }
1346
1347 /*
1348 * /proc fs routines....
1349 */
1350
line_info(struct seq_file * m,SLMP_INFO * info)1351 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1352 {
1353 char stat_buf[30];
1354 unsigned long flags;
1355
1356 seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1357 "\tIRQ=%d MaxFrameSize=%u\n",
1358 info->device_name,
1359 info->phys_sca_base,
1360 info->phys_memory_base,
1361 info->phys_statctrl_base,
1362 info->phys_lcr_base,
1363 info->irq_level,
1364 info->max_frame_size );
1365
1366 /* output current serial signal states */
1367 spin_lock_irqsave(&info->lock,flags);
1368 get_signals(info);
1369 spin_unlock_irqrestore(&info->lock,flags);
1370
1371 stat_buf[0] = 0;
1372 stat_buf[1] = 0;
1373 if (info->serial_signals & SerialSignal_RTS)
1374 strcat(stat_buf, "|RTS");
1375 if (info->serial_signals & SerialSignal_CTS)
1376 strcat(stat_buf, "|CTS");
1377 if (info->serial_signals & SerialSignal_DTR)
1378 strcat(stat_buf, "|DTR");
1379 if (info->serial_signals & SerialSignal_DSR)
1380 strcat(stat_buf, "|DSR");
1381 if (info->serial_signals & SerialSignal_DCD)
1382 strcat(stat_buf, "|CD");
1383 if (info->serial_signals & SerialSignal_RI)
1384 strcat(stat_buf, "|RI");
1385
1386 if (info->params.mode == MGSL_MODE_HDLC) {
1387 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1388 info->icount.txok, info->icount.rxok);
1389 if (info->icount.txunder)
1390 seq_printf(m, " txunder:%d", info->icount.txunder);
1391 if (info->icount.txabort)
1392 seq_printf(m, " txabort:%d", info->icount.txabort);
1393 if (info->icount.rxshort)
1394 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1395 if (info->icount.rxlong)
1396 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1397 if (info->icount.rxover)
1398 seq_printf(m, " rxover:%d", info->icount.rxover);
1399 if (info->icount.rxcrc)
1400 seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1401 } else {
1402 seq_printf(m, "\tASYNC tx:%d rx:%d",
1403 info->icount.tx, info->icount.rx);
1404 if (info->icount.frame)
1405 seq_printf(m, " fe:%d", info->icount.frame);
1406 if (info->icount.parity)
1407 seq_printf(m, " pe:%d", info->icount.parity);
1408 if (info->icount.brk)
1409 seq_printf(m, " brk:%d", info->icount.brk);
1410 if (info->icount.overrun)
1411 seq_printf(m, " oe:%d", info->icount.overrun);
1412 }
1413
1414 /* Append serial signal status to end */
1415 seq_printf(m, " %s\n", stat_buf+1);
1416
1417 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1418 info->tx_active,info->bh_requested,info->bh_running,
1419 info->pending_bh);
1420 }
1421
1422 /* Called to print information about devices
1423 */
synclinkmp_proc_show(struct seq_file * m,void * v)1424 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1425 {
1426 SLMP_INFO *info;
1427
1428 seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1429
1430 info = synclinkmp_device_list;
1431 while( info ) {
1432 line_info(m, info);
1433 info = info->next_device;
1434 }
1435 return 0;
1436 }
1437
synclinkmp_proc_open(struct inode * inode,struct file * file)1438 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1439 {
1440 return single_open(file, synclinkmp_proc_show, NULL);
1441 }
1442
1443 static const struct file_operations synclinkmp_proc_fops = {
1444 .owner = THIS_MODULE,
1445 .open = synclinkmp_proc_open,
1446 .read = seq_read,
1447 .llseek = seq_lseek,
1448 .release = single_release,
1449 };
1450
1451 /* Return the count of bytes in transmit buffer
1452 */
chars_in_buffer(struct tty_struct * tty)1453 static int chars_in_buffer(struct tty_struct *tty)
1454 {
1455 SLMP_INFO *info = tty->driver_data;
1456
1457 if (sanity_check(info, tty->name, "chars_in_buffer"))
1458 return 0;
1459
1460 if (debug_level >= DEBUG_LEVEL_INFO)
1461 printk("%s(%d):%s chars_in_buffer()=%d\n",
1462 __FILE__, __LINE__, info->device_name, info->tx_count);
1463
1464 return info->tx_count;
1465 }
1466
1467 /* Signal remote device to throttle send data (our receive data)
1468 */
throttle(struct tty_struct * tty)1469 static void throttle(struct tty_struct * tty)
1470 {
1471 SLMP_INFO *info = tty->driver_data;
1472 unsigned long flags;
1473
1474 if (debug_level >= DEBUG_LEVEL_INFO)
1475 printk("%s(%d):%s throttle() entry\n",
1476 __FILE__,__LINE__, info->device_name );
1477
1478 if (sanity_check(info, tty->name, "throttle"))
1479 return;
1480
1481 if (I_IXOFF(tty))
1482 send_xchar(tty, STOP_CHAR(tty));
1483
1484 if (tty->termios.c_cflag & CRTSCTS) {
1485 spin_lock_irqsave(&info->lock,flags);
1486 info->serial_signals &= ~SerialSignal_RTS;
1487 set_signals(info);
1488 spin_unlock_irqrestore(&info->lock,flags);
1489 }
1490 }
1491
1492 /* Signal remote device to stop throttling send data (our receive data)
1493 */
unthrottle(struct tty_struct * tty)1494 static void unthrottle(struct tty_struct * tty)
1495 {
1496 SLMP_INFO *info = tty->driver_data;
1497 unsigned long flags;
1498
1499 if (debug_level >= DEBUG_LEVEL_INFO)
1500 printk("%s(%d):%s unthrottle() entry\n",
1501 __FILE__,__LINE__, info->device_name );
1502
1503 if (sanity_check(info, tty->name, "unthrottle"))
1504 return;
1505
1506 if (I_IXOFF(tty)) {
1507 if (info->x_char)
1508 info->x_char = 0;
1509 else
1510 send_xchar(tty, START_CHAR(tty));
1511 }
1512
1513 if (tty->termios.c_cflag & CRTSCTS) {
1514 spin_lock_irqsave(&info->lock,flags);
1515 info->serial_signals |= SerialSignal_RTS;
1516 set_signals(info);
1517 spin_unlock_irqrestore(&info->lock,flags);
1518 }
1519 }
1520
1521 /* set or clear transmit break condition
1522 * break_state -1=set break condition, 0=clear
1523 */
set_break(struct tty_struct * tty,int break_state)1524 static int set_break(struct tty_struct *tty, int break_state)
1525 {
1526 unsigned char RegValue;
1527 SLMP_INFO * info = tty->driver_data;
1528 unsigned long flags;
1529
1530 if (debug_level >= DEBUG_LEVEL_INFO)
1531 printk("%s(%d):%s set_break(%d)\n",
1532 __FILE__,__LINE__, info->device_name, break_state);
1533
1534 if (sanity_check(info, tty->name, "set_break"))
1535 return -EINVAL;
1536
1537 spin_lock_irqsave(&info->lock,flags);
1538 RegValue = read_reg(info, CTL);
1539 if (break_state == -1)
1540 RegValue |= BIT3;
1541 else
1542 RegValue &= ~BIT3;
1543 write_reg(info, CTL, RegValue);
1544 spin_unlock_irqrestore(&info->lock,flags);
1545 return 0;
1546 }
1547
1548 #if SYNCLINK_GENERIC_HDLC
1549
1550 /**
1551 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1552 * set encoding and frame check sequence (FCS) options
1553 *
1554 * dev pointer to network device structure
1555 * encoding serial encoding setting
1556 * parity FCS setting
1557 *
1558 * returns 0 if success, otherwise error code
1559 */
hdlcdev_attach(struct net_device * dev,unsigned short encoding,unsigned short parity)1560 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1561 unsigned short parity)
1562 {
1563 SLMP_INFO *info = dev_to_port(dev);
1564 unsigned char new_encoding;
1565 unsigned short new_crctype;
1566
1567 /* return error if TTY interface open */
1568 if (info->port.count)
1569 return -EBUSY;
1570
1571 switch (encoding)
1572 {
1573 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1574 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1575 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1576 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1577 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1578 default: return -EINVAL;
1579 }
1580
1581 switch (parity)
1582 {
1583 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1584 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1585 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1586 default: return -EINVAL;
1587 }
1588
1589 info->params.encoding = new_encoding;
1590 info->params.crc_type = new_crctype;
1591
1592 /* if network interface up, reprogram hardware */
1593 if (info->netcount)
1594 program_hw(info);
1595
1596 return 0;
1597 }
1598
1599 /**
1600 * called by generic HDLC layer to send frame
1601 *
1602 * skb socket buffer containing HDLC frame
1603 * dev pointer to network device structure
1604 */
hdlcdev_xmit(struct sk_buff * skb,struct net_device * dev)1605 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1606 struct net_device *dev)
1607 {
1608 SLMP_INFO *info = dev_to_port(dev);
1609 unsigned long flags;
1610
1611 if (debug_level >= DEBUG_LEVEL_INFO)
1612 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1613
1614 /* stop sending until this frame completes */
1615 netif_stop_queue(dev);
1616
1617 /* copy data to device buffers */
1618 info->tx_count = skb->len;
1619 tx_load_dma_buffer(info, skb->data, skb->len);
1620
1621 /* update network statistics */
1622 dev->stats.tx_packets++;
1623 dev->stats.tx_bytes += skb->len;
1624
1625 /* done with socket buffer, so free it */
1626 dev_kfree_skb(skb);
1627
1628 /* save start time for transmit timeout detection */
1629 dev->trans_start = jiffies;
1630
1631 /* start hardware transmitter if necessary */
1632 spin_lock_irqsave(&info->lock,flags);
1633 if (!info->tx_active)
1634 tx_start(info);
1635 spin_unlock_irqrestore(&info->lock,flags);
1636
1637 return NETDEV_TX_OK;
1638 }
1639
1640 /**
1641 * called by network layer when interface enabled
1642 * claim resources and initialize hardware
1643 *
1644 * dev pointer to network device structure
1645 *
1646 * returns 0 if success, otherwise error code
1647 */
hdlcdev_open(struct net_device * dev)1648 static int hdlcdev_open(struct net_device *dev)
1649 {
1650 SLMP_INFO *info = dev_to_port(dev);
1651 int rc;
1652 unsigned long flags;
1653
1654 if (debug_level >= DEBUG_LEVEL_INFO)
1655 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1656
1657 /* generic HDLC layer open processing */
1658 if ((rc = hdlc_open(dev)))
1659 return rc;
1660
1661 /* arbitrate between network and tty opens */
1662 spin_lock_irqsave(&info->netlock, flags);
1663 if (info->port.count != 0 || info->netcount != 0) {
1664 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1665 spin_unlock_irqrestore(&info->netlock, flags);
1666 return -EBUSY;
1667 }
1668 info->netcount=1;
1669 spin_unlock_irqrestore(&info->netlock, flags);
1670
1671 /* claim resources and init adapter */
1672 if ((rc = startup(info)) != 0) {
1673 spin_lock_irqsave(&info->netlock, flags);
1674 info->netcount=0;
1675 spin_unlock_irqrestore(&info->netlock, flags);
1676 return rc;
1677 }
1678
1679 /* assert RTS and DTR, apply hardware settings */
1680 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
1681 program_hw(info);
1682
1683 /* enable network layer transmit */
1684 dev->trans_start = jiffies;
1685 netif_start_queue(dev);
1686
1687 /* inform generic HDLC layer of current DCD status */
1688 spin_lock_irqsave(&info->lock, flags);
1689 get_signals(info);
1690 spin_unlock_irqrestore(&info->lock, flags);
1691 if (info->serial_signals & SerialSignal_DCD)
1692 netif_carrier_on(dev);
1693 else
1694 netif_carrier_off(dev);
1695 return 0;
1696 }
1697
1698 /**
1699 * called by network layer when interface is disabled
1700 * shutdown hardware and release resources
1701 *
1702 * dev pointer to network device structure
1703 *
1704 * returns 0 if success, otherwise error code
1705 */
hdlcdev_close(struct net_device * dev)1706 static int hdlcdev_close(struct net_device *dev)
1707 {
1708 SLMP_INFO *info = dev_to_port(dev);
1709 unsigned long flags;
1710
1711 if (debug_level >= DEBUG_LEVEL_INFO)
1712 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1713
1714 netif_stop_queue(dev);
1715
1716 /* shutdown adapter and release resources */
1717 shutdown(info);
1718
1719 hdlc_close(dev);
1720
1721 spin_lock_irqsave(&info->netlock, flags);
1722 info->netcount=0;
1723 spin_unlock_irqrestore(&info->netlock, flags);
1724
1725 return 0;
1726 }
1727
1728 /**
1729 * called by network layer to process IOCTL call to network device
1730 *
1731 * dev pointer to network device structure
1732 * ifr pointer to network interface request structure
1733 * cmd IOCTL command code
1734 *
1735 * returns 0 if success, otherwise error code
1736 */
hdlcdev_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1737 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1738 {
1739 const size_t size = sizeof(sync_serial_settings);
1740 sync_serial_settings new_line;
1741 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1742 SLMP_INFO *info = dev_to_port(dev);
1743 unsigned int flags;
1744
1745 if (debug_level >= DEBUG_LEVEL_INFO)
1746 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1747
1748 /* return error if TTY interface open */
1749 if (info->port.count)
1750 return -EBUSY;
1751
1752 if (cmd != SIOCWANDEV)
1753 return hdlc_ioctl(dev, ifr, cmd);
1754
1755 switch(ifr->ifr_settings.type) {
1756 case IF_GET_IFACE: /* return current sync_serial_settings */
1757
1758 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1759 if (ifr->ifr_settings.size < size) {
1760 ifr->ifr_settings.size = size; /* data size wanted */
1761 return -ENOBUFS;
1762 }
1763
1764 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1765 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1766 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1767 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1768
1769 memset(&new_line, 0, sizeof(new_line));
1770 switch (flags){
1771 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1772 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1773 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1774 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1775 default: new_line.clock_type = CLOCK_DEFAULT;
1776 }
1777
1778 new_line.clock_rate = info->params.clock_speed;
1779 new_line.loopback = info->params.loopback ? 1:0;
1780
1781 if (copy_to_user(line, &new_line, size))
1782 return -EFAULT;
1783 return 0;
1784
1785 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1786
1787 if(!capable(CAP_NET_ADMIN))
1788 return -EPERM;
1789 if (copy_from_user(&new_line, line, size))
1790 return -EFAULT;
1791
1792 switch (new_line.clock_type)
1793 {
1794 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1795 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1796 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1797 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1798 case CLOCK_DEFAULT: flags = info->params.flags &
1799 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1800 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1801 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1802 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1803 default: return -EINVAL;
1804 }
1805
1806 if (new_line.loopback != 0 && new_line.loopback != 1)
1807 return -EINVAL;
1808
1809 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1810 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1811 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1812 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1813 info->params.flags |= flags;
1814
1815 info->params.loopback = new_line.loopback;
1816
1817 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1818 info->params.clock_speed = new_line.clock_rate;
1819 else
1820 info->params.clock_speed = 0;
1821
1822 /* if network interface up, reprogram hardware */
1823 if (info->netcount)
1824 program_hw(info);
1825 return 0;
1826
1827 default:
1828 return hdlc_ioctl(dev, ifr, cmd);
1829 }
1830 }
1831
1832 /**
1833 * called by network layer when transmit timeout is detected
1834 *
1835 * dev pointer to network device structure
1836 */
hdlcdev_tx_timeout(struct net_device * dev)1837 static void hdlcdev_tx_timeout(struct net_device *dev)
1838 {
1839 SLMP_INFO *info = dev_to_port(dev);
1840 unsigned long flags;
1841
1842 if (debug_level >= DEBUG_LEVEL_INFO)
1843 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1844
1845 dev->stats.tx_errors++;
1846 dev->stats.tx_aborted_errors++;
1847
1848 spin_lock_irqsave(&info->lock,flags);
1849 tx_stop(info);
1850 spin_unlock_irqrestore(&info->lock,flags);
1851
1852 netif_wake_queue(dev);
1853 }
1854
1855 /**
1856 * called by device driver when transmit completes
1857 * reenable network layer transmit if stopped
1858 *
1859 * info pointer to device instance information
1860 */
hdlcdev_tx_done(SLMP_INFO * info)1861 static void hdlcdev_tx_done(SLMP_INFO *info)
1862 {
1863 if (netif_queue_stopped(info->netdev))
1864 netif_wake_queue(info->netdev);
1865 }
1866
1867 /**
1868 * called by device driver when frame received
1869 * pass frame to network layer
1870 *
1871 * info pointer to device instance information
1872 * buf pointer to buffer contianing frame data
1873 * size count of data bytes in buf
1874 */
hdlcdev_rx(SLMP_INFO * info,char * buf,int size)1875 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1876 {
1877 struct sk_buff *skb = dev_alloc_skb(size);
1878 struct net_device *dev = info->netdev;
1879
1880 if (debug_level >= DEBUG_LEVEL_INFO)
1881 printk("hdlcdev_rx(%s)\n",dev->name);
1882
1883 if (skb == NULL) {
1884 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1885 dev->name);
1886 dev->stats.rx_dropped++;
1887 return;
1888 }
1889
1890 memcpy(skb_put(skb, size), buf, size);
1891
1892 skb->protocol = hdlc_type_trans(skb, dev);
1893
1894 dev->stats.rx_packets++;
1895 dev->stats.rx_bytes += size;
1896
1897 netif_rx(skb);
1898 }
1899
1900 static const struct net_device_ops hdlcdev_ops = {
1901 .ndo_open = hdlcdev_open,
1902 .ndo_stop = hdlcdev_close,
1903 .ndo_change_mtu = hdlc_change_mtu,
1904 .ndo_start_xmit = hdlc_start_xmit,
1905 .ndo_do_ioctl = hdlcdev_ioctl,
1906 .ndo_tx_timeout = hdlcdev_tx_timeout,
1907 };
1908
1909 /**
1910 * called by device driver when adding device instance
1911 * do generic HDLC initialization
1912 *
1913 * info pointer to device instance information
1914 *
1915 * returns 0 if success, otherwise error code
1916 */
hdlcdev_init(SLMP_INFO * info)1917 static int hdlcdev_init(SLMP_INFO *info)
1918 {
1919 int rc;
1920 struct net_device *dev;
1921 hdlc_device *hdlc;
1922
1923 /* allocate and initialize network and HDLC layer objects */
1924
1925 if (!(dev = alloc_hdlcdev(info))) {
1926 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1927 return -ENOMEM;
1928 }
1929
1930 /* for network layer reporting purposes only */
1931 dev->mem_start = info->phys_sca_base;
1932 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1933 dev->irq = info->irq_level;
1934
1935 /* network layer callbacks and settings */
1936 dev->netdev_ops = &hdlcdev_ops;
1937 dev->watchdog_timeo = 10 * HZ;
1938 dev->tx_queue_len = 50;
1939
1940 /* generic HDLC layer callbacks and settings */
1941 hdlc = dev_to_hdlc(dev);
1942 hdlc->attach = hdlcdev_attach;
1943 hdlc->xmit = hdlcdev_xmit;
1944
1945 /* register objects with HDLC layer */
1946 if ((rc = register_hdlc_device(dev))) {
1947 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1948 free_netdev(dev);
1949 return rc;
1950 }
1951
1952 info->netdev = dev;
1953 return 0;
1954 }
1955
1956 /**
1957 * called by device driver when removing device instance
1958 * do generic HDLC cleanup
1959 *
1960 * info pointer to device instance information
1961 */
hdlcdev_exit(SLMP_INFO * info)1962 static void hdlcdev_exit(SLMP_INFO *info)
1963 {
1964 unregister_hdlc_device(info->netdev);
1965 free_netdev(info->netdev);
1966 info->netdev = NULL;
1967 }
1968
1969 #endif /* CONFIG_HDLC */
1970
1971
1972 /* Return next bottom half action to perform.
1973 * Return Value: BH action code or 0 if nothing to do.
1974 */
bh_action(SLMP_INFO * info)1975 static int bh_action(SLMP_INFO *info)
1976 {
1977 unsigned long flags;
1978 int rc = 0;
1979
1980 spin_lock_irqsave(&info->lock,flags);
1981
1982 if (info->pending_bh & BH_RECEIVE) {
1983 info->pending_bh &= ~BH_RECEIVE;
1984 rc = BH_RECEIVE;
1985 } else if (info->pending_bh & BH_TRANSMIT) {
1986 info->pending_bh &= ~BH_TRANSMIT;
1987 rc = BH_TRANSMIT;
1988 } else if (info->pending_bh & BH_STATUS) {
1989 info->pending_bh &= ~BH_STATUS;
1990 rc = BH_STATUS;
1991 }
1992
1993 if (!rc) {
1994 /* Mark BH routine as complete */
1995 info->bh_running = false;
1996 info->bh_requested = false;
1997 }
1998
1999 spin_unlock_irqrestore(&info->lock,flags);
2000
2001 return rc;
2002 }
2003
2004 /* Perform bottom half processing of work items queued by ISR.
2005 */
bh_handler(struct work_struct * work)2006 static void bh_handler(struct work_struct *work)
2007 {
2008 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2009 int action;
2010
2011 if ( debug_level >= DEBUG_LEVEL_BH )
2012 printk( "%s(%d):%s bh_handler() entry\n",
2013 __FILE__,__LINE__,info->device_name);
2014
2015 info->bh_running = true;
2016
2017 while((action = bh_action(info)) != 0) {
2018
2019 /* Process work item */
2020 if ( debug_level >= DEBUG_LEVEL_BH )
2021 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2022 __FILE__,__LINE__,info->device_name, action);
2023
2024 switch (action) {
2025
2026 case BH_RECEIVE:
2027 bh_receive(info);
2028 break;
2029 case BH_TRANSMIT:
2030 bh_transmit(info);
2031 break;
2032 case BH_STATUS:
2033 bh_status(info);
2034 break;
2035 default:
2036 /* unknown work item ID */
2037 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2038 __FILE__,__LINE__,info->device_name,action);
2039 break;
2040 }
2041 }
2042
2043 if ( debug_level >= DEBUG_LEVEL_BH )
2044 printk( "%s(%d):%s bh_handler() exit\n",
2045 __FILE__,__LINE__,info->device_name);
2046 }
2047
bh_receive(SLMP_INFO * info)2048 static void bh_receive(SLMP_INFO *info)
2049 {
2050 if ( debug_level >= DEBUG_LEVEL_BH )
2051 printk( "%s(%d):%s bh_receive()\n",
2052 __FILE__,__LINE__,info->device_name);
2053
2054 while( rx_get_frame(info) );
2055 }
2056
bh_transmit(SLMP_INFO * info)2057 static void bh_transmit(SLMP_INFO *info)
2058 {
2059 struct tty_struct *tty = info->port.tty;
2060
2061 if ( debug_level >= DEBUG_LEVEL_BH )
2062 printk( "%s(%d):%s bh_transmit() entry\n",
2063 __FILE__,__LINE__,info->device_name);
2064
2065 if (tty)
2066 tty_wakeup(tty);
2067 }
2068
bh_status(SLMP_INFO * info)2069 static void bh_status(SLMP_INFO *info)
2070 {
2071 if ( debug_level >= DEBUG_LEVEL_BH )
2072 printk( "%s(%d):%s bh_status() entry\n",
2073 __FILE__,__LINE__,info->device_name);
2074
2075 info->ri_chkcount = 0;
2076 info->dsr_chkcount = 0;
2077 info->dcd_chkcount = 0;
2078 info->cts_chkcount = 0;
2079 }
2080
isr_timer(SLMP_INFO * info)2081 static void isr_timer(SLMP_INFO * info)
2082 {
2083 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2084
2085 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2086 write_reg(info, IER2, 0);
2087
2088 /* TMCS, Timer Control/Status Register
2089 *
2090 * 07 CMF, Compare match flag (read only) 1=match
2091 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2092 * 05 Reserved, must be 0
2093 * 04 TME, Timer Enable
2094 * 03..00 Reserved, must be 0
2095 *
2096 * 0000 0000
2097 */
2098 write_reg(info, (unsigned char)(timer + TMCS), 0);
2099
2100 info->irq_occurred = true;
2101
2102 if ( debug_level >= DEBUG_LEVEL_ISR )
2103 printk("%s(%d):%s isr_timer()\n",
2104 __FILE__,__LINE__,info->device_name);
2105 }
2106
isr_rxint(SLMP_INFO * info)2107 static void isr_rxint(SLMP_INFO * info)
2108 {
2109 struct tty_struct *tty = info->port.tty;
2110 struct mgsl_icount *icount = &info->icount;
2111 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2112 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2113
2114 /* clear status bits */
2115 if (status)
2116 write_reg(info, SR1, status);
2117
2118 if (status2)
2119 write_reg(info, SR2, status2);
2120
2121 if ( debug_level >= DEBUG_LEVEL_ISR )
2122 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2123 __FILE__,__LINE__,info->device_name,status,status2);
2124
2125 if (info->params.mode == MGSL_MODE_ASYNC) {
2126 if (status & BRKD) {
2127 icount->brk++;
2128
2129 /* process break detection if tty control
2130 * is not set to ignore it
2131 */
2132 if (!(status & info->ignore_status_mask1)) {
2133 if (info->read_status_mask1 & BRKD) {
2134 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2135 if (tty && (info->port.flags & ASYNC_SAK))
2136 do_SAK(tty);
2137 }
2138 }
2139 }
2140 }
2141 else {
2142 if (status & (FLGD|IDLD)) {
2143 if (status & FLGD)
2144 info->icount.exithunt++;
2145 else if (status & IDLD)
2146 info->icount.rxidle++;
2147 wake_up_interruptible(&info->event_wait_q);
2148 }
2149 }
2150
2151 if (status & CDCD) {
2152 /* simulate a common modem status change interrupt
2153 * for our handler
2154 */
2155 get_signals( info );
2156 isr_io_pin(info,
2157 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2158 }
2159 }
2160
2161 /*
2162 * handle async rx data interrupts
2163 */
isr_rxrdy(SLMP_INFO * info)2164 static void isr_rxrdy(SLMP_INFO * info)
2165 {
2166 u16 status;
2167 unsigned char DataByte;
2168 struct mgsl_icount *icount = &info->icount;
2169
2170 if ( debug_level >= DEBUG_LEVEL_ISR )
2171 printk("%s(%d):%s isr_rxrdy\n",
2172 __FILE__,__LINE__,info->device_name);
2173
2174 while((status = read_reg(info,CST0)) & BIT0)
2175 {
2176 int flag = 0;
2177 bool over = false;
2178 DataByte = read_reg(info,TRB);
2179
2180 icount->rx++;
2181
2182 if ( status & (PE + FRME + OVRN) ) {
2183 printk("%s(%d):%s rxerr=%04X\n",
2184 __FILE__,__LINE__,info->device_name,status);
2185
2186 /* update error statistics */
2187 if (status & PE)
2188 icount->parity++;
2189 else if (status & FRME)
2190 icount->frame++;
2191 else if (status & OVRN)
2192 icount->overrun++;
2193
2194 /* discard char if tty control flags say so */
2195 if (status & info->ignore_status_mask2)
2196 continue;
2197
2198 status &= info->read_status_mask2;
2199
2200 if (status & PE)
2201 flag = TTY_PARITY;
2202 else if (status & FRME)
2203 flag = TTY_FRAME;
2204 if (status & OVRN) {
2205 /* Overrun is special, since it's
2206 * reported immediately, and doesn't
2207 * affect the current character
2208 */
2209 over = true;
2210 }
2211 } /* end of if (error) */
2212
2213 tty_insert_flip_char(&info->port, DataByte, flag);
2214 if (over)
2215 tty_insert_flip_char(&info->port, 0, TTY_OVERRUN);
2216 }
2217
2218 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2219 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2220 __FILE__,__LINE__,info->device_name,
2221 icount->rx,icount->brk,icount->parity,
2222 icount->frame,icount->overrun);
2223 }
2224
2225 tty_flip_buffer_push(&info->port);
2226 }
2227
isr_txeom(SLMP_INFO * info,unsigned char status)2228 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2229 {
2230 if ( debug_level >= DEBUG_LEVEL_ISR )
2231 printk("%s(%d):%s isr_txeom status=%02x\n",
2232 __FILE__,__LINE__,info->device_name,status);
2233
2234 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2235 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2236 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2237
2238 if (status & UDRN) {
2239 write_reg(info, CMD, TXRESET);
2240 write_reg(info, CMD, TXENABLE);
2241 } else
2242 write_reg(info, CMD, TXBUFCLR);
2243
2244 /* disable and clear tx interrupts */
2245 info->ie0_value &= ~TXRDYE;
2246 info->ie1_value &= ~(IDLE + UDRN);
2247 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2248 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2249
2250 if ( info->tx_active ) {
2251 if (info->params.mode != MGSL_MODE_ASYNC) {
2252 if (status & UDRN)
2253 info->icount.txunder++;
2254 else if (status & IDLE)
2255 info->icount.txok++;
2256 }
2257
2258 info->tx_active = false;
2259 info->tx_count = info->tx_put = info->tx_get = 0;
2260
2261 del_timer(&info->tx_timer);
2262
2263 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2264 info->serial_signals &= ~SerialSignal_RTS;
2265 info->drop_rts_on_tx_done = false;
2266 set_signals(info);
2267 }
2268
2269 #if SYNCLINK_GENERIC_HDLC
2270 if (info->netcount)
2271 hdlcdev_tx_done(info);
2272 else
2273 #endif
2274 {
2275 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2276 tx_stop(info);
2277 return;
2278 }
2279 info->pending_bh |= BH_TRANSMIT;
2280 }
2281 }
2282 }
2283
2284
2285 /*
2286 * handle tx status interrupts
2287 */
isr_txint(SLMP_INFO * info)2288 static void isr_txint(SLMP_INFO * info)
2289 {
2290 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2291
2292 /* clear status bits */
2293 write_reg(info, SR1, status);
2294
2295 if ( debug_level >= DEBUG_LEVEL_ISR )
2296 printk("%s(%d):%s isr_txint status=%02x\n",
2297 __FILE__,__LINE__,info->device_name,status);
2298
2299 if (status & (UDRN + IDLE))
2300 isr_txeom(info, status);
2301
2302 if (status & CCTS) {
2303 /* simulate a common modem status change interrupt
2304 * for our handler
2305 */
2306 get_signals( info );
2307 isr_io_pin(info,
2308 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2309
2310 }
2311 }
2312
2313 /*
2314 * handle async tx data interrupts
2315 */
isr_txrdy(SLMP_INFO * info)2316 static void isr_txrdy(SLMP_INFO * info)
2317 {
2318 if ( debug_level >= DEBUG_LEVEL_ISR )
2319 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2320 __FILE__,__LINE__,info->device_name,info->tx_count);
2321
2322 if (info->params.mode != MGSL_MODE_ASYNC) {
2323 /* disable TXRDY IRQ, enable IDLE IRQ */
2324 info->ie0_value &= ~TXRDYE;
2325 info->ie1_value |= IDLE;
2326 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2327 return;
2328 }
2329
2330 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2331 tx_stop(info);
2332 return;
2333 }
2334
2335 if ( info->tx_count )
2336 tx_load_fifo( info );
2337 else {
2338 info->tx_active = false;
2339 info->ie0_value &= ~TXRDYE;
2340 write_reg(info, IE0, info->ie0_value);
2341 }
2342
2343 if (info->tx_count < WAKEUP_CHARS)
2344 info->pending_bh |= BH_TRANSMIT;
2345 }
2346
isr_rxdmaok(SLMP_INFO * info)2347 static void isr_rxdmaok(SLMP_INFO * info)
2348 {
2349 /* BIT7 = EOT (end of transfer)
2350 * BIT6 = EOM (end of message/frame)
2351 */
2352 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2353
2354 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2355 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2356
2357 if ( debug_level >= DEBUG_LEVEL_ISR )
2358 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2359 __FILE__,__LINE__,info->device_name,status);
2360
2361 info->pending_bh |= BH_RECEIVE;
2362 }
2363
isr_rxdmaerror(SLMP_INFO * info)2364 static void isr_rxdmaerror(SLMP_INFO * info)
2365 {
2366 /* BIT5 = BOF (buffer overflow)
2367 * BIT4 = COF (counter overflow)
2368 */
2369 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2370
2371 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2372 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2373
2374 if ( debug_level >= DEBUG_LEVEL_ISR )
2375 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2376 __FILE__,__LINE__,info->device_name,status);
2377
2378 info->rx_overflow = true;
2379 info->pending_bh |= BH_RECEIVE;
2380 }
2381
isr_txdmaok(SLMP_INFO * info)2382 static void isr_txdmaok(SLMP_INFO * info)
2383 {
2384 unsigned char status_reg1 = read_reg(info, SR1);
2385
2386 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2387 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2388 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2389
2390 if ( debug_level >= DEBUG_LEVEL_ISR )
2391 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2392 __FILE__,__LINE__,info->device_name,status_reg1);
2393
2394 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2395 write_reg16(info, TRC0, 0);
2396 info->ie0_value |= TXRDYE;
2397 write_reg(info, IE0, info->ie0_value);
2398 }
2399
isr_txdmaerror(SLMP_INFO * info)2400 static void isr_txdmaerror(SLMP_INFO * info)
2401 {
2402 /* BIT5 = BOF (buffer overflow)
2403 * BIT4 = COF (counter overflow)
2404 */
2405 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2406
2407 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2408 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2409
2410 if ( debug_level >= DEBUG_LEVEL_ISR )
2411 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2412 __FILE__,__LINE__,info->device_name,status);
2413 }
2414
2415 /* handle input serial signal changes
2416 */
isr_io_pin(SLMP_INFO * info,u16 status)2417 static void isr_io_pin( SLMP_INFO *info, u16 status )
2418 {
2419 struct mgsl_icount *icount;
2420
2421 if ( debug_level >= DEBUG_LEVEL_ISR )
2422 printk("%s(%d):isr_io_pin status=%04X\n",
2423 __FILE__,__LINE__,status);
2424
2425 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2426 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2427 icount = &info->icount;
2428 /* update input line counters */
2429 if (status & MISCSTATUS_RI_LATCHED) {
2430 icount->rng++;
2431 if ( status & SerialSignal_RI )
2432 info->input_signal_events.ri_up++;
2433 else
2434 info->input_signal_events.ri_down++;
2435 }
2436 if (status & MISCSTATUS_DSR_LATCHED) {
2437 icount->dsr++;
2438 if ( status & SerialSignal_DSR )
2439 info->input_signal_events.dsr_up++;
2440 else
2441 info->input_signal_events.dsr_down++;
2442 }
2443 if (status & MISCSTATUS_DCD_LATCHED) {
2444 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2445 info->ie1_value &= ~CDCD;
2446 write_reg(info, IE1, info->ie1_value);
2447 }
2448 icount->dcd++;
2449 if (status & SerialSignal_DCD) {
2450 info->input_signal_events.dcd_up++;
2451 } else
2452 info->input_signal_events.dcd_down++;
2453 #if SYNCLINK_GENERIC_HDLC
2454 if (info->netcount) {
2455 if (status & SerialSignal_DCD)
2456 netif_carrier_on(info->netdev);
2457 else
2458 netif_carrier_off(info->netdev);
2459 }
2460 #endif
2461 }
2462 if (status & MISCSTATUS_CTS_LATCHED)
2463 {
2464 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2465 info->ie1_value &= ~CCTS;
2466 write_reg(info, IE1, info->ie1_value);
2467 }
2468 icount->cts++;
2469 if ( status & SerialSignal_CTS )
2470 info->input_signal_events.cts_up++;
2471 else
2472 info->input_signal_events.cts_down++;
2473 }
2474 wake_up_interruptible(&info->status_event_wait_q);
2475 wake_up_interruptible(&info->event_wait_q);
2476
2477 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2478 (status & MISCSTATUS_DCD_LATCHED) ) {
2479 if ( debug_level >= DEBUG_LEVEL_ISR )
2480 printk("%s CD now %s...", info->device_name,
2481 (status & SerialSignal_DCD) ? "on" : "off");
2482 if (status & SerialSignal_DCD)
2483 wake_up_interruptible(&info->port.open_wait);
2484 else {
2485 if ( debug_level >= DEBUG_LEVEL_ISR )
2486 printk("doing serial hangup...");
2487 if (info->port.tty)
2488 tty_hangup(info->port.tty);
2489 }
2490 }
2491
2492 if (tty_port_cts_enabled(&info->port) &&
2493 (status & MISCSTATUS_CTS_LATCHED) ) {
2494 if ( info->port.tty ) {
2495 if (info->port.tty->hw_stopped) {
2496 if (status & SerialSignal_CTS) {
2497 if ( debug_level >= DEBUG_LEVEL_ISR )
2498 printk("CTS tx start...");
2499 info->port.tty->hw_stopped = 0;
2500 tx_start(info);
2501 info->pending_bh |= BH_TRANSMIT;
2502 return;
2503 }
2504 } else {
2505 if (!(status & SerialSignal_CTS)) {
2506 if ( debug_level >= DEBUG_LEVEL_ISR )
2507 printk("CTS tx stop...");
2508 info->port.tty->hw_stopped = 1;
2509 tx_stop(info);
2510 }
2511 }
2512 }
2513 }
2514 }
2515
2516 info->pending_bh |= BH_STATUS;
2517 }
2518
2519 /* Interrupt service routine entry point.
2520 *
2521 * Arguments:
2522 * irq interrupt number that caused interrupt
2523 * dev_id device ID supplied during interrupt registration
2524 * regs interrupted processor context
2525 */
synclinkmp_interrupt(int dummy,void * dev_id)2526 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2527 {
2528 SLMP_INFO *info = dev_id;
2529 unsigned char status, status0, status1=0;
2530 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2531 unsigned char timerstatus0, timerstatus1=0;
2532 unsigned char shift;
2533 unsigned int i;
2534 unsigned short tmp;
2535
2536 if ( debug_level >= DEBUG_LEVEL_ISR )
2537 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2538 __FILE__, __LINE__, info->irq_level);
2539
2540 spin_lock(&info->lock);
2541
2542 for(;;) {
2543
2544 /* get status for SCA0 (ports 0-1) */
2545 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2546 status0 = (unsigned char)tmp;
2547 dmastatus0 = (unsigned char)(tmp>>8);
2548 timerstatus0 = read_reg(info, ISR2);
2549
2550 if ( debug_level >= DEBUG_LEVEL_ISR )
2551 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2552 __FILE__, __LINE__, info->device_name,
2553 status0, dmastatus0, timerstatus0);
2554
2555 if (info->port_count == 4) {
2556 /* get status for SCA1 (ports 2-3) */
2557 tmp = read_reg16(info->port_array[2], ISR0);
2558 status1 = (unsigned char)tmp;
2559 dmastatus1 = (unsigned char)(tmp>>8);
2560 timerstatus1 = read_reg(info->port_array[2], ISR2);
2561
2562 if ( debug_level >= DEBUG_LEVEL_ISR )
2563 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2564 __FILE__,__LINE__,info->device_name,
2565 status1,dmastatus1,timerstatus1);
2566 }
2567
2568 if (!status0 && !dmastatus0 && !timerstatus0 &&
2569 !status1 && !dmastatus1 && !timerstatus1)
2570 break;
2571
2572 for(i=0; i < info->port_count ; i++) {
2573 if (info->port_array[i] == NULL)
2574 continue;
2575 if (i < 2) {
2576 status = status0;
2577 dmastatus = dmastatus0;
2578 } else {
2579 status = status1;
2580 dmastatus = dmastatus1;
2581 }
2582
2583 shift = i & 1 ? 4 :0;
2584
2585 if (status & BIT0 << shift)
2586 isr_rxrdy(info->port_array[i]);
2587 if (status & BIT1 << shift)
2588 isr_txrdy(info->port_array[i]);
2589 if (status & BIT2 << shift)
2590 isr_rxint(info->port_array[i]);
2591 if (status & BIT3 << shift)
2592 isr_txint(info->port_array[i]);
2593
2594 if (dmastatus & BIT0 << shift)
2595 isr_rxdmaerror(info->port_array[i]);
2596 if (dmastatus & BIT1 << shift)
2597 isr_rxdmaok(info->port_array[i]);
2598 if (dmastatus & BIT2 << shift)
2599 isr_txdmaerror(info->port_array[i]);
2600 if (dmastatus & BIT3 << shift)
2601 isr_txdmaok(info->port_array[i]);
2602 }
2603
2604 if (timerstatus0 & (BIT5 | BIT4))
2605 isr_timer(info->port_array[0]);
2606 if (timerstatus0 & (BIT7 | BIT6))
2607 isr_timer(info->port_array[1]);
2608 if (timerstatus1 & (BIT5 | BIT4))
2609 isr_timer(info->port_array[2]);
2610 if (timerstatus1 & (BIT7 | BIT6))
2611 isr_timer(info->port_array[3]);
2612 }
2613
2614 for(i=0; i < info->port_count ; i++) {
2615 SLMP_INFO * port = info->port_array[i];
2616
2617 /* Request bottom half processing if there's something
2618 * for it to do and the bh is not already running.
2619 *
2620 * Note: startup adapter diags require interrupts.
2621 * do not request bottom half processing if the
2622 * device is not open in a normal mode.
2623 */
2624 if ( port && (port->port.count || port->netcount) &&
2625 port->pending_bh && !port->bh_running &&
2626 !port->bh_requested ) {
2627 if ( debug_level >= DEBUG_LEVEL_ISR )
2628 printk("%s(%d):%s queueing bh task.\n",
2629 __FILE__,__LINE__,port->device_name);
2630 schedule_work(&port->task);
2631 port->bh_requested = true;
2632 }
2633 }
2634
2635 spin_unlock(&info->lock);
2636
2637 if ( debug_level >= DEBUG_LEVEL_ISR )
2638 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2639 __FILE__, __LINE__, info->irq_level);
2640 return IRQ_HANDLED;
2641 }
2642
2643 /* Initialize and start device.
2644 */
startup(SLMP_INFO * info)2645 static int startup(SLMP_INFO * info)
2646 {
2647 if ( debug_level >= DEBUG_LEVEL_INFO )
2648 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2649
2650 if (info->port.flags & ASYNC_INITIALIZED)
2651 return 0;
2652
2653 if (!info->tx_buf) {
2654 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2655 if (!info->tx_buf) {
2656 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2657 __FILE__,__LINE__,info->device_name);
2658 return -ENOMEM;
2659 }
2660 }
2661
2662 info->pending_bh = 0;
2663
2664 memset(&info->icount, 0, sizeof(info->icount));
2665
2666 /* program hardware for current parameters */
2667 reset_port(info);
2668
2669 change_params(info);
2670
2671 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2672
2673 if (info->port.tty)
2674 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2675
2676 info->port.flags |= ASYNC_INITIALIZED;
2677
2678 return 0;
2679 }
2680
2681 /* Called by close() and hangup() to shutdown hardware
2682 */
shutdown(SLMP_INFO * info)2683 static void shutdown(SLMP_INFO * info)
2684 {
2685 unsigned long flags;
2686
2687 if (!(info->port.flags & ASYNC_INITIALIZED))
2688 return;
2689
2690 if (debug_level >= DEBUG_LEVEL_INFO)
2691 printk("%s(%d):%s synclinkmp_shutdown()\n",
2692 __FILE__,__LINE__, info->device_name );
2693
2694 /* clear status wait queue because status changes */
2695 /* can't happen after shutting down the hardware */
2696 wake_up_interruptible(&info->status_event_wait_q);
2697 wake_up_interruptible(&info->event_wait_q);
2698
2699 del_timer(&info->tx_timer);
2700 del_timer(&info->status_timer);
2701
2702 kfree(info->tx_buf);
2703 info->tx_buf = NULL;
2704
2705 spin_lock_irqsave(&info->lock,flags);
2706
2707 reset_port(info);
2708
2709 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2710 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2711 set_signals(info);
2712 }
2713
2714 spin_unlock_irqrestore(&info->lock,flags);
2715
2716 if (info->port.tty)
2717 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2718
2719 info->port.flags &= ~ASYNC_INITIALIZED;
2720 }
2721
program_hw(SLMP_INFO * info)2722 static void program_hw(SLMP_INFO *info)
2723 {
2724 unsigned long flags;
2725
2726 spin_lock_irqsave(&info->lock,flags);
2727
2728 rx_stop(info);
2729 tx_stop(info);
2730
2731 info->tx_count = info->tx_put = info->tx_get = 0;
2732
2733 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2734 hdlc_mode(info);
2735 else
2736 async_mode(info);
2737
2738 set_signals(info);
2739
2740 info->dcd_chkcount = 0;
2741 info->cts_chkcount = 0;
2742 info->ri_chkcount = 0;
2743 info->dsr_chkcount = 0;
2744
2745 info->ie1_value |= (CDCD|CCTS);
2746 write_reg(info, IE1, info->ie1_value);
2747
2748 get_signals(info);
2749
2750 if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2751 rx_start(info);
2752
2753 spin_unlock_irqrestore(&info->lock,flags);
2754 }
2755
2756 /* Reconfigure adapter based on new parameters
2757 */
change_params(SLMP_INFO * info)2758 static void change_params(SLMP_INFO *info)
2759 {
2760 unsigned cflag;
2761 int bits_per_char;
2762
2763 if (!info->port.tty)
2764 return;
2765
2766 if (debug_level >= DEBUG_LEVEL_INFO)
2767 printk("%s(%d):%s change_params()\n",
2768 __FILE__,__LINE__, info->device_name );
2769
2770 cflag = info->port.tty->termios.c_cflag;
2771
2772 /* if B0 rate (hangup) specified then negate RTS and DTR */
2773 /* otherwise assert RTS and DTR */
2774 if (cflag & CBAUD)
2775 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
2776 else
2777 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2778
2779 /* byte size and parity */
2780
2781 switch (cflag & CSIZE) {
2782 case CS5: info->params.data_bits = 5; break;
2783 case CS6: info->params.data_bits = 6; break;
2784 case CS7: info->params.data_bits = 7; break;
2785 case CS8: info->params.data_bits = 8; break;
2786 /* Never happens, but GCC is too dumb to figure it out */
2787 default: info->params.data_bits = 7; break;
2788 }
2789
2790 if (cflag & CSTOPB)
2791 info->params.stop_bits = 2;
2792 else
2793 info->params.stop_bits = 1;
2794
2795 info->params.parity = ASYNC_PARITY_NONE;
2796 if (cflag & PARENB) {
2797 if (cflag & PARODD)
2798 info->params.parity = ASYNC_PARITY_ODD;
2799 else
2800 info->params.parity = ASYNC_PARITY_EVEN;
2801 #ifdef CMSPAR
2802 if (cflag & CMSPAR)
2803 info->params.parity = ASYNC_PARITY_SPACE;
2804 #endif
2805 }
2806
2807 /* calculate number of jiffies to transmit a full
2808 * FIFO (32 bytes) at specified data rate
2809 */
2810 bits_per_char = info->params.data_bits +
2811 info->params.stop_bits + 1;
2812
2813 /* if port data rate is set to 460800 or less then
2814 * allow tty settings to override, otherwise keep the
2815 * current data rate.
2816 */
2817 if (info->params.data_rate <= 460800) {
2818 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2819 }
2820
2821 if ( info->params.data_rate ) {
2822 info->timeout = (32*HZ*bits_per_char) /
2823 info->params.data_rate;
2824 }
2825 info->timeout += HZ/50; /* Add .02 seconds of slop */
2826
2827 if (cflag & CRTSCTS)
2828 info->port.flags |= ASYNC_CTS_FLOW;
2829 else
2830 info->port.flags &= ~ASYNC_CTS_FLOW;
2831
2832 if (cflag & CLOCAL)
2833 info->port.flags &= ~ASYNC_CHECK_CD;
2834 else
2835 info->port.flags |= ASYNC_CHECK_CD;
2836
2837 /* process tty input control flags */
2838
2839 info->read_status_mask2 = OVRN;
2840 if (I_INPCK(info->port.tty))
2841 info->read_status_mask2 |= PE | FRME;
2842 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2843 info->read_status_mask1 |= BRKD;
2844 if (I_IGNPAR(info->port.tty))
2845 info->ignore_status_mask2 |= PE | FRME;
2846 if (I_IGNBRK(info->port.tty)) {
2847 info->ignore_status_mask1 |= BRKD;
2848 /* If ignoring parity and break indicators, ignore
2849 * overruns too. (For real raw support).
2850 */
2851 if (I_IGNPAR(info->port.tty))
2852 info->ignore_status_mask2 |= OVRN;
2853 }
2854
2855 program_hw(info);
2856 }
2857
get_stats(SLMP_INFO * info,struct mgsl_icount __user * user_icount)2858 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2859 {
2860 int err;
2861
2862 if (debug_level >= DEBUG_LEVEL_INFO)
2863 printk("%s(%d):%s get_params()\n",
2864 __FILE__,__LINE__, info->device_name);
2865
2866 if (!user_icount) {
2867 memset(&info->icount, 0, sizeof(info->icount));
2868 } else {
2869 mutex_lock(&info->port.mutex);
2870 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2871 mutex_unlock(&info->port.mutex);
2872 if (err)
2873 return -EFAULT;
2874 }
2875
2876 return 0;
2877 }
2878
get_params(SLMP_INFO * info,MGSL_PARAMS __user * user_params)2879 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2880 {
2881 int err;
2882 if (debug_level >= DEBUG_LEVEL_INFO)
2883 printk("%s(%d):%s get_params()\n",
2884 __FILE__,__LINE__, info->device_name);
2885
2886 mutex_lock(&info->port.mutex);
2887 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2888 mutex_unlock(&info->port.mutex);
2889 if (err) {
2890 if ( debug_level >= DEBUG_LEVEL_INFO )
2891 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2892 __FILE__,__LINE__,info->device_name);
2893 return -EFAULT;
2894 }
2895
2896 return 0;
2897 }
2898
set_params(SLMP_INFO * info,MGSL_PARAMS __user * new_params)2899 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2900 {
2901 unsigned long flags;
2902 MGSL_PARAMS tmp_params;
2903 int err;
2904
2905 if (debug_level >= DEBUG_LEVEL_INFO)
2906 printk("%s(%d):%s set_params\n",
2907 __FILE__,__LINE__,info->device_name );
2908 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2909 if (err) {
2910 if ( debug_level >= DEBUG_LEVEL_INFO )
2911 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2912 __FILE__,__LINE__,info->device_name);
2913 return -EFAULT;
2914 }
2915
2916 mutex_lock(&info->port.mutex);
2917 spin_lock_irqsave(&info->lock,flags);
2918 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2919 spin_unlock_irqrestore(&info->lock,flags);
2920
2921 change_params(info);
2922 mutex_unlock(&info->port.mutex);
2923
2924 return 0;
2925 }
2926
get_txidle(SLMP_INFO * info,int __user * idle_mode)2927 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2928 {
2929 int err;
2930
2931 if (debug_level >= DEBUG_LEVEL_INFO)
2932 printk("%s(%d):%s get_txidle()=%d\n",
2933 __FILE__,__LINE__, info->device_name, info->idle_mode);
2934
2935 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2936 if (err) {
2937 if ( debug_level >= DEBUG_LEVEL_INFO )
2938 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2939 __FILE__,__LINE__,info->device_name);
2940 return -EFAULT;
2941 }
2942
2943 return 0;
2944 }
2945
set_txidle(SLMP_INFO * info,int idle_mode)2946 static int set_txidle(SLMP_INFO * info, int idle_mode)
2947 {
2948 unsigned long flags;
2949
2950 if (debug_level >= DEBUG_LEVEL_INFO)
2951 printk("%s(%d):%s set_txidle(%d)\n",
2952 __FILE__,__LINE__,info->device_name, idle_mode );
2953
2954 spin_lock_irqsave(&info->lock,flags);
2955 info->idle_mode = idle_mode;
2956 tx_set_idle( info );
2957 spin_unlock_irqrestore(&info->lock,flags);
2958 return 0;
2959 }
2960
tx_enable(SLMP_INFO * info,int enable)2961 static int tx_enable(SLMP_INFO * info, int enable)
2962 {
2963 unsigned long flags;
2964
2965 if (debug_level >= DEBUG_LEVEL_INFO)
2966 printk("%s(%d):%s tx_enable(%d)\n",
2967 __FILE__,__LINE__,info->device_name, enable);
2968
2969 spin_lock_irqsave(&info->lock,flags);
2970 if ( enable ) {
2971 if ( !info->tx_enabled ) {
2972 tx_start(info);
2973 }
2974 } else {
2975 if ( info->tx_enabled )
2976 tx_stop(info);
2977 }
2978 spin_unlock_irqrestore(&info->lock,flags);
2979 return 0;
2980 }
2981
2982 /* abort send HDLC frame
2983 */
tx_abort(SLMP_INFO * info)2984 static int tx_abort(SLMP_INFO * info)
2985 {
2986 unsigned long flags;
2987
2988 if (debug_level >= DEBUG_LEVEL_INFO)
2989 printk("%s(%d):%s tx_abort()\n",
2990 __FILE__,__LINE__,info->device_name);
2991
2992 spin_lock_irqsave(&info->lock,flags);
2993 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2994 info->ie1_value &= ~UDRN;
2995 info->ie1_value |= IDLE;
2996 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
2997 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
2998
2999 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
3000 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3001
3002 write_reg(info, CMD, TXABORT);
3003 }
3004 spin_unlock_irqrestore(&info->lock,flags);
3005 return 0;
3006 }
3007
rx_enable(SLMP_INFO * info,int enable)3008 static int rx_enable(SLMP_INFO * info, int enable)
3009 {
3010 unsigned long flags;
3011
3012 if (debug_level >= DEBUG_LEVEL_INFO)
3013 printk("%s(%d):%s rx_enable(%d)\n",
3014 __FILE__,__LINE__,info->device_name,enable);
3015
3016 spin_lock_irqsave(&info->lock,flags);
3017 if ( enable ) {
3018 if ( !info->rx_enabled )
3019 rx_start(info);
3020 } else {
3021 if ( info->rx_enabled )
3022 rx_stop(info);
3023 }
3024 spin_unlock_irqrestore(&info->lock,flags);
3025 return 0;
3026 }
3027
3028 /* wait for specified event to occur
3029 */
wait_mgsl_event(SLMP_INFO * info,int __user * mask_ptr)3030 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3031 {
3032 unsigned long flags;
3033 int s;
3034 int rc=0;
3035 struct mgsl_icount cprev, cnow;
3036 int events;
3037 int mask;
3038 struct _input_signal_events oldsigs, newsigs;
3039 DECLARE_WAITQUEUE(wait, current);
3040
3041 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3042 if (rc) {
3043 return -EFAULT;
3044 }
3045
3046 if (debug_level >= DEBUG_LEVEL_INFO)
3047 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3048 __FILE__,__LINE__,info->device_name,mask);
3049
3050 spin_lock_irqsave(&info->lock,flags);
3051
3052 /* return immediately if state matches requested events */
3053 get_signals(info);
3054 s = info->serial_signals;
3055
3056 events = mask &
3057 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3058 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3059 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3060 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3061 if (events) {
3062 spin_unlock_irqrestore(&info->lock,flags);
3063 goto exit;
3064 }
3065
3066 /* save current irq counts */
3067 cprev = info->icount;
3068 oldsigs = info->input_signal_events;
3069
3070 /* enable hunt and idle irqs if needed */
3071 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3072 unsigned char oldval = info->ie1_value;
3073 unsigned char newval = oldval +
3074 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3075 (mask & MgslEvent_IdleReceived ? IDLD:0);
3076 if ( oldval != newval ) {
3077 info->ie1_value = newval;
3078 write_reg(info, IE1, info->ie1_value);
3079 }
3080 }
3081
3082 set_current_state(TASK_INTERRUPTIBLE);
3083 add_wait_queue(&info->event_wait_q, &wait);
3084
3085 spin_unlock_irqrestore(&info->lock,flags);
3086
3087 for(;;) {
3088 schedule();
3089 if (signal_pending(current)) {
3090 rc = -ERESTARTSYS;
3091 break;
3092 }
3093
3094 /* get current irq counts */
3095 spin_lock_irqsave(&info->lock,flags);
3096 cnow = info->icount;
3097 newsigs = info->input_signal_events;
3098 set_current_state(TASK_INTERRUPTIBLE);
3099 spin_unlock_irqrestore(&info->lock,flags);
3100
3101 /* if no change, wait aborted for some reason */
3102 if (newsigs.dsr_up == oldsigs.dsr_up &&
3103 newsigs.dsr_down == oldsigs.dsr_down &&
3104 newsigs.dcd_up == oldsigs.dcd_up &&
3105 newsigs.dcd_down == oldsigs.dcd_down &&
3106 newsigs.cts_up == oldsigs.cts_up &&
3107 newsigs.cts_down == oldsigs.cts_down &&
3108 newsigs.ri_up == oldsigs.ri_up &&
3109 newsigs.ri_down == oldsigs.ri_down &&
3110 cnow.exithunt == cprev.exithunt &&
3111 cnow.rxidle == cprev.rxidle) {
3112 rc = -EIO;
3113 break;
3114 }
3115
3116 events = mask &
3117 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3118 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3119 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3120 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3121 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3122 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3123 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3124 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3125 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3126 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3127 if (events)
3128 break;
3129
3130 cprev = cnow;
3131 oldsigs = newsigs;
3132 }
3133
3134 remove_wait_queue(&info->event_wait_q, &wait);
3135 set_current_state(TASK_RUNNING);
3136
3137
3138 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3139 spin_lock_irqsave(&info->lock,flags);
3140 if (!waitqueue_active(&info->event_wait_q)) {
3141 /* disable enable exit hunt mode/idle rcvd IRQs */
3142 info->ie1_value &= ~(FLGD|IDLD);
3143 write_reg(info, IE1, info->ie1_value);
3144 }
3145 spin_unlock_irqrestore(&info->lock,flags);
3146 }
3147 exit:
3148 if ( rc == 0 )
3149 PUT_USER(rc, events, mask_ptr);
3150
3151 return rc;
3152 }
3153
modem_input_wait(SLMP_INFO * info,int arg)3154 static int modem_input_wait(SLMP_INFO *info,int arg)
3155 {
3156 unsigned long flags;
3157 int rc;
3158 struct mgsl_icount cprev, cnow;
3159 DECLARE_WAITQUEUE(wait, current);
3160
3161 /* save current irq counts */
3162 spin_lock_irqsave(&info->lock,flags);
3163 cprev = info->icount;
3164 add_wait_queue(&info->status_event_wait_q, &wait);
3165 set_current_state(TASK_INTERRUPTIBLE);
3166 spin_unlock_irqrestore(&info->lock,flags);
3167
3168 for(;;) {
3169 schedule();
3170 if (signal_pending(current)) {
3171 rc = -ERESTARTSYS;
3172 break;
3173 }
3174
3175 /* get new irq counts */
3176 spin_lock_irqsave(&info->lock,flags);
3177 cnow = info->icount;
3178 set_current_state(TASK_INTERRUPTIBLE);
3179 spin_unlock_irqrestore(&info->lock,flags);
3180
3181 /* if no change, wait aborted for some reason */
3182 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3183 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3184 rc = -EIO;
3185 break;
3186 }
3187
3188 /* check for change in caller specified modem input */
3189 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3190 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3191 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3192 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3193 rc = 0;
3194 break;
3195 }
3196
3197 cprev = cnow;
3198 }
3199 remove_wait_queue(&info->status_event_wait_q, &wait);
3200 set_current_state(TASK_RUNNING);
3201 return rc;
3202 }
3203
3204 /* return the state of the serial control and status signals
3205 */
tiocmget(struct tty_struct * tty)3206 static int tiocmget(struct tty_struct *tty)
3207 {
3208 SLMP_INFO *info = tty->driver_data;
3209 unsigned int result;
3210 unsigned long flags;
3211
3212 spin_lock_irqsave(&info->lock,flags);
3213 get_signals(info);
3214 spin_unlock_irqrestore(&info->lock,flags);
3215
3216 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) |
3217 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) |
3218 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) |
3219 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG : 0) |
3220 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) |
3221 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0);
3222
3223 if (debug_level >= DEBUG_LEVEL_INFO)
3224 printk("%s(%d):%s tiocmget() value=%08X\n",
3225 __FILE__,__LINE__, info->device_name, result );
3226 return result;
3227 }
3228
3229 /* set modem control signals (DTR/RTS)
3230 */
tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)3231 static int tiocmset(struct tty_struct *tty,
3232 unsigned int set, unsigned int clear)
3233 {
3234 SLMP_INFO *info = tty->driver_data;
3235 unsigned long flags;
3236
3237 if (debug_level >= DEBUG_LEVEL_INFO)
3238 printk("%s(%d):%s tiocmset(%x,%x)\n",
3239 __FILE__,__LINE__,info->device_name, set, clear);
3240
3241 if (set & TIOCM_RTS)
3242 info->serial_signals |= SerialSignal_RTS;
3243 if (set & TIOCM_DTR)
3244 info->serial_signals |= SerialSignal_DTR;
3245 if (clear & TIOCM_RTS)
3246 info->serial_signals &= ~SerialSignal_RTS;
3247 if (clear & TIOCM_DTR)
3248 info->serial_signals &= ~SerialSignal_DTR;
3249
3250 spin_lock_irqsave(&info->lock,flags);
3251 set_signals(info);
3252 spin_unlock_irqrestore(&info->lock,flags);
3253
3254 return 0;
3255 }
3256
carrier_raised(struct tty_port * port)3257 static int carrier_raised(struct tty_port *port)
3258 {
3259 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3260 unsigned long flags;
3261
3262 spin_lock_irqsave(&info->lock,flags);
3263 get_signals(info);
3264 spin_unlock_irqrestore(&info->lock,flags);
3265
3266 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3267 }
3268
dtr_rts(struct tty_port * port,int on)3269 static void dtr_rts(struct tty_port *port, int on)
3270 {
3271 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3272 unsigned long flags;
3273
3274 spin_lock_irqsave(&info->lock,flags);
3275 if (on)
3276 info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR;
3277 else
3278 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3279 set_signals(info);
3280 spin_unlock_irqrestore(&info->lock,flags);
3281 }
3282
3283 /* Block the current process until the specified port is ready to open.
3284 */
block_til_ready(struct tty_struct * tty,struct file * filp,SLMP_INFO * info)3285 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3286 SLMP_INFO *info)
3287 {
3288 DECLARE_WAITQUEUE(wait, current);
3289 int retval;
3290 bool do_clocal = false;
3291 unsigned long flags;
3292 int cd;
3293 struct tty_port *port = &info->port;
3294
3295 if (debug_level >= DEBUG_LEVEL_INFO)
3296 printk("%s(%d):%s block_til_ready()\n",
3297 __FILE__,__LINE__, tty->driver->name );
3298
3299 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3300 /* nonblock mode is set or port is not enabled */
3301 /* just verify that callout device is not active */
3302 port->flags |= ASYNC_NORMAL_ACTIVE;
3303 return 0;
3304 }
3305
3306 if (tty->termios.c_cflag & CLOCAL)
3307 do_clocal = true;
3308
3309 /* Wait for carrier detect and the line to become
3310 * free (i.e., not in use by the callout). While we are in
3311 * this loop, port->count is dropped by one, so that
3312 * close() knows when to free things. We restore it upon
3313 * exit, either normal or abnormal.
3314 */
3315
3316 retval = 0;
3317 add_wait_queue(&port->open_wait, &wait);
3318
3319 if (debug_level >= DEBUG_LEVEL_INFO)
3320 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3321 __FILE__,__LINE__, tty->driver->name, port->count );
3322
3323 spin_lock_irqsave(&info->lock, flags);
3324 port->count--;
3325 spin_unlock_irqrestore(&info->lock, flags);
3326 port->blocked_open++;
3327
3328 while (1) {
3329 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3330 tty_port_raise_dtr_rts(port);
3331
3332 set_current_state(TASK_INTERRUPTIBLE);
3333
3334 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3335 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3336 -EAGAIN : -ERESTARTSYS;
3337 break;
3338 }
3339
3340 cd = tty_port_carrier_raised(port);
3341
3342 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3343 break;
3344
3345 if (signal_pending(current)) {
3346 retval = -ERESTARTSYS;
3347 break;
3348 }
3349
3350 if (debug_level >= DEBUG_LEVEL_INFO)
3351 printk("%s(%d):%s block_til_ready() count=%d\n",
3352 __FILE__,__LINE__, tty->driver->name, port->count );
3353
3354 tty_unlock(tty);
3355 schedule();
3356 tty_lock(tty);
3357 }
3358
3359 set_current_state(TASK_RUNNING);
3360 remove_wait_queue(&port->open_wait, &wait);
3361 if (!tty_hung_up_p(filp))
3362 port->count++;
3363 port->blocked_open--;
3364
3365 if (debug_level >= DEBUG_LEVEL_INFO)
3366 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3367 __FILE__,__LINE__, tty->driver->name, port->count );
3368
3369 if (!retval)
3370 port->flags |= ASYNC_NORMAL_ACTIVE;
3371
3372 return retval;
3373 }
3374
alloc_dma_bufs(SLMP_INFO * info)3375 static int alloc_dma_bufs(SLMP_INFO *info)
3376 {
3377 unsigned short BuffersPerFrame;
3378 unsigned short BufferCount;
3379
3380 // Force allocation to start at 64K boundary for each port.
3381 // This is necessary because *all* buffer descriptors for a port
3382 // *must* be in the same 64K block. All descriptors on a port
3383 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3384 // into the CBP register.
3385 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3386
3387 /* Calculate the number of DMA buffers necessary to hold the */
3388 /* largest allowable frame size. Note: If the max frame size is */
3389 /* not an even multiple of the DMA buffer size then we need to */
3390 /* round the buffer count per frame up one. */
3391
3392 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3393 if ( info->max_frame_size % SCABUFSIZE )
3394 BuffersPerFrame++;
3395
3396 /* calculate total number of data buffers (SCABUFSIZE) possible
3397 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3398 * for the descriptor list (BUFFERLISTSIZE).
3399 */
3400 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3401
3402 /* limit number of buffers to maximum amount of descriptors */
3403 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3404 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3405
3406 /* use enough buffers to transmit one max size frame */
3407 info->tx_buf_count = BuffersPerFrame + 1;
3408
3409 /* never use more than half the available buffers for transmit */
3410 if (info->tx_buf_count > (BufferCount/2))
3411 info->tx_buf_count = BufferCount/2;
3412
3413 if (info->tx_buf_count > SCAMAXDESC)
3414 info->tx_buf_count = SCAMAXDESC;
3415
3416 /* use remaining buffers for receive */
3417 info->rx_buf_count = BufferCount - info->tx_buf_count;
3418
3419 if (info->rx_buf_count > SCAMAXDESC)
3420 info->rx_buf_count = SCAMAXDESC;
3421
3422 if ( debug_level >= DEBUG_LEVEL_INFO )
3423 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3424 __FILE__,__LINE__, info->device_name,
3425 info->tx_buf_count,info->rx_buf_count);
3426
3427 if ( alloc_buf_list( info ) < 0 ||
3428 alloc_frame_bufs(info,
3429 info->rx_buf_list,
3430 info->rx_buf_list_ex,
3431 info->rx_buf_count) < 0 ||
3432 alloc_frame_bufs(info,
3433 info->tx_buf_list,
3434 info->tx_buf_list_ex,
3435 info->tx_buf_count) < 0 ||
3436 alloc_tmp_rx_buf(info) < 0 ) {
3437 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3438 __FILE__,__LINE__, info->device_name);
3439 return -ENOMEM;
3440 }
3441
3442 rx_reset_buffers( info );
3443
3444 return 0;
3445 }
3446
3447 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3448 */
alloc_buf_list(SLMP_INFO * info)3449 static int alloc_buf_list(SLMP_INFO *info)
3450 {
3451 unsigned int i;
3452
3453 /* build list in adapter shared memory */
3454 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3455 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3456 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3457
3458 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3459
3460 /* Save virtual address pointers to the receive and */
3461 /* transmit buffer lists. (Receive 1st). These pointers will */
3462 /* be used by the processor to access the lists. */
3463 info->rx_buf_list = (SCADESC *)info->buffer_list;
3464
3465 info->tx_buf_list = (SCADESC *)info->buffer_list;
3466 info->tx_buf_list += info->rx_buf_count;
3467
3468 /* Build links for circular buffer entry lists (tx and rx)
3469 *
3470 * Note: links are physical addresses read by the SCA device
3471 * to determine the next buffer entry to use.
3472 */
3473
3474 for ( i = 0; i < info->rx_buf_count; i++ ) {
3475 /* calculate and store physical address of this buffer entry */
3476 info->rx_buf_list_ex[i].phys_entry =
3477 info->buffer_list_phys + (i * SCABUFSIZE);
3478
3479 /* calculate and store physical address of */
3480 /* next entry in cirular list of entries */
3481 info->rx_buf_list[i].next = info->buffer_list_phys;
3482 if ( i < info->rx_buf_count - 1 )
3483 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3484
3485 info->rx_buf_list[i].length = SCABUFSIZE;
3486 }
3487
3488 for ( i = 0; i < info->tx_buf_count; i++ ) {
3489 /* calculate and store physical address of this buffer entry */
3490 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3491 ((info->rx_buf_count + i) * sizeof(SCADESC));
3492
3493 /* calculate and store physical address of */
3494 /* next entry in cirular list of entries */
3495
3496 info->tx_buf_list[i].next = info->buffer_list_phys +
3497 info->rx_buf_count * sizeof(SCADESC);
3498
3499 if ( i < info->tx_buf_count - 1 )
3500 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3501 }
3502
3503 return 0;
3504 }
3505
3506 /* Allocate the frame DMA buffers used by the specified buffer list.
3507 */
alloc_frame_bufs(SLMP_INFO * info,SCADESC * buf_list,SCADESC_EX * buf_list_ex,int count)3508 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3509 {
3510 int i;
3511 unsigned long phys_addr;
3512
3513 for ( i = 0; i < count; i++ ) {
3514 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3515 phys_addr = info->port_array[0]->last_mem_alloc;
3516 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3517
3518 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3519 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3520 }
3521
3522 return 0;
3523 }
3524
free_dma_bufs(SLMP_INFO * info)3525 static void free_dma_bufs(SLMP_INFO *info)
3526 {
3527 info->buffer_list = NULL;
3528 info->rx_buf_list = NULL;
3529 info->tx_buf_list = NULL;
3530 }
3531
3532 /* allocate buffer large enough to hold max_frame_size.
3533 * This buffer is used to pass an assembled frame to the line discipline.
3534 */
alloc_tmp_rx_buf(SLMP_INFO * info)3535 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3536 {
3537 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3538 if (info->tmp_rx_buf == NULL)
3539 return -ENOMEM;
3540 /* unused flag buffer to satisfy receive_buf calling interface */
3541 info->flag_buf = kzalloc(info->max_frame_size, GFP_KERNEL);
3542 if (!info->flag_buf) {
3543 kfree(info->tmp_rx_buf);
3544 info->tmp_rx_buf = NULL;
3545 return -ENOMEM;
3546 }
3547 return 0;
3548 }
3549
free_tmp_rx_buf(SLMP_INFO * info)3550 static void free_tmp_rx_buf(SLMP_INFO *info)
3551 {
3552 kfree(info->tmp_rx_buf);
3553 info->tmp_rx_buf = NULL;
3554 kfree(info->flag_buf);
3555 info->flag_buf = NULL;
3556 }
3557
claim_resources(SLMP_INFO * info)3558 static int claim_resources(SLMP_INFO *info)
3559 {
3560 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3561 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3562 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3563 info->init_error = DiagStatus_AddressConflict;
3564 goto errout;
3565 }
3566 else
3567 info->shared_mem_requested = true;
3568
3569 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3570 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3571 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3572 info->init_error = DiagStatus_AddressConflict;
3573 goto errout;
3574 }
3575 else
3576 info->lcr_mem_requested = true;
3577
3578 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3579 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3580 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3581 info->init_error = DiagStatus_AddressConflict;
3582 goto errout;
3583 }
3584 else
3585 info->sca_base_requested = true;
3586
3587 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3588 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3589 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3590 info->init_error = DiagStatus_AddressConflict;
3591 goto errout;
3592 }
3593 else
3594 info->sca_statctrl_requested = true;
3595
3596 info->memory_base = ioremap_nocache(info->phys_memory_base,
3597 SCA_MEM_SIZE);
3598 if (!info->memory_base) {
3599 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3600 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3601 info->init_error = DiagStatus_CantAssignPciResources;
3602 goto errout;
3603 }
3604
3605 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3606 if (!info->lcr_base) {
3607 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3608 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3609 info->init_error = DiagStatus_CantAssignPciResources;
3610 goto errout;
3611 }
3612 info->lcr_base += info->lcr_offset;
3613
3614 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3615 if (!info->sca_base) {
3616 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3617 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3618 info->init_error = DiagStatus_CantAssignPciResources;
3619 goto errout;
3620 }
3621 info->sca_base += info->sca_offset;
3622
3623 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3624 PAGE_SIZE);
3625 if (!info->statctrl_base) {
3626 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3627 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3628 info->init_error = DiagStatus_CantAssignPciResources;
3629 goto errout;
3630 }
3631 info->statctrl_base += info->statctrl_offset;
3632
3633 if ( !memory_test(info) ) {
3634 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3635 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3636 info->init_error = DiagStatus_MemoryError;
3637 goto errout;
3638 }
3639
3640 return 0;
3641
3642 errout:
3643 release_resources( info );
3644 return -ENODEV;
3645 }
3646
release_resources(SLMP_INFO * info)3647 static void release_resources(SLMP_INFO *info)
3648 {
3649 if ( debug_level >= DEBUG_LEVEL_INFO )
3650 printk( "%s(%d):%s release_resources() entry\n",
3651 __FILE__,__LINE__,info->device_name );
3652
3653 if ( info->irq_requested ) {
3654 free_irq(info->irq_level, info);
3655 info->irq_requested = false;
3656 }
3657
3658 if ( info->shared_mem_requested ) {
3659 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3660 info->shared_mem_requested = false;
3661 }
3662 if ( info->lcr_mem_requested ) {
3663 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3664 info->lcr_mem_requested = false;
3665 }
3666 if ( info->sca_base_requested ) {
3667 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3668 info->sca_base_requested = false;
3669 }
3670 if ( info->sca_statctrl_requested ) {
3671 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3672 info->sca_statctrl_requested = false;
3673 }
3674
3675 if (info->memory_base){
3676 iounmap(info->memory_base);
3677 info->memory_base = NULL;
3678 }
3679
3680 if (info->sca_base) {
3681 iounmap(info->sca_base - info->sca_offset);
3682 info->sca_base=NULL;
3683 }
3684
3685 if (info->statctrl_base) {
3686 iounmap(info->statctrl_base - info->statctrl_offset);
3687 info->statctrl_base=NULL;
3688 }
3689
3690 if (info->lcr_base){
3691 iounmap(info->lcr_base - info->lcr_offset);
3692 info->lcr_base = NULL;
3693 }
3694
3695 if ( debug_level >= DEBUG_LEVEL_INFO )
3696 printk( "%s(%d):%s release_resources() exit\n",
3697 __FILE__,__LINE__,info->device_name );
3698 }
3699
3700 /* Add the specified device instance data structure to the
3701 * global linked list of devices and increment the device count.
3702 */
add_device(SLMP_INFO * info)3703 static void add_device(SLMP_INFO *info)
3704 {
3705 info->next_device = NULL;
3706 info->line = synclinkmp_device_count;
3707 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3708
3709 if (info->line < MAX_DEVICES) {
3710 if (maxframe[info->line])
3711 info->max_frame_size = maxframe[info->line];
3712 }
3713
3714 synclinkmp_device_count++;
3715
3716 if ( !synclinkmp_device_list )
3717 synclinkmp_device_list = info;
3718 else {
3719 SLMP_INFO *current_dev = synclinkmp_device_list;
3720 while( current_dev->next_device )
3721 current_dev = current_dev->next_device;
3722 current_dev->next_device = info;
3723 }
3724
3725 if ( info->max_frame_size < 4096 )
3726 info->max_frame_size = 4096;
3727 else if ( info->max_frame_size > 65535 )
3728 info->max_frame_size = 65535;
3729
3730 printk( "SyncLink MultiPort %s: "
3731 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3732 info->device_name,
3733 info->phys_sca_base,
3734 info->phys_memory_base,
3735 info->phys_statctrl_base,
3736 info->phys_lcr_base,
3737 info->irq_level,
3738 info->max_frame_size );
3739
3740 #if SYNCLINK_GENERIC_HDLC
3741 hdlcdev_init(info);
3742 #endif
3743 }
3744
3745 static const struct tty_port_operations port_ops = {
3746 .carrier_raised = carrier_raised,
3747 .dtr_rts = dtr_rts,
3748 };
3749
3750 /* Allocate and initialize a device instance structure
3751 *
3752 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3753 */
alloc_dev(int adapter_num,int port_num,struct pci_dev * pdev)3754 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3755 {
3756 SLMP_INFO *info;
3757
3758 info = kzalloc(sizeof(SLMP_INFO),
3759 GFP_KERNEL);
3760
3761 if (!info) {
3762 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3763 __FILE__,__LINE__, adapter_num, port_num);
3764 } else {
3765 tty_port_init(&info->port);
3766 info->port.ops = &port_ops;
3767 info->magic = MGSL_MAGIC;
3768 INIT_WORK(&info->task, bh_handler);
3769 info->max_frame_size = 4096;
3770 info->port.close_delay = 5*HZ/10;
3771 info->port.closing_wait = 30*HZ;
3772 init_waitqueue_head(&info->status_event_wait_q);
3773 init_waitqueue_head(&info->event_wait_q);
3774 spin_lock_init(&info->netlock);
3775 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3776 info->idle_mode = HDLC_TXIDLE_FLAGS;
3777 info->adapter_num = adapter_num;
3778 info->port_num = port_num;
3779
3780 /* Copy configuration info to device instance data */
3781 info->irq_level = pdev->irq;
3782 info->phys_lcr_base = pci_resource_start(pdev,0);
3783 info->phys_sca_base = pci_resource_start(pdev,2);
3784 info->phys_memory_base = pci_resource_start(pdev,3);
3785 info->phys_statctrl_base = pci_resource_start(pdev,4);
3786
3787 /* Because veremap only works on page boundaries we must map
3788 * a larger area than is actually implemented for the LCR
3789 * memory range. We map a full page starting at the page boundary.
3790 */
3791 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3792 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3793
3794 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3795 info->phys_sca_base &= ~(PAGE_SIZE-1);
3796
3797 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3798 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3799
3800 info->bus_type = MGSL_BUS_TYPE_PCI;
3801 info->irq_flags = IRQF_SHARED;
3802
3803 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3804 setup_timer(&info->status_timer, status_timeout,
3805 (unsigned long)info);
3806
3807 /* Store the PCI9050 misc control register value because a flaw
3808 * in the PCI9050 prevents LCR registers from being read if
3809 * BIOS assigns an LCR base address with bit 7 set.
3810 *
3811 * Only the misc control register is accessed for which only
3812 * write access is needed, so set an initial value and change
3813 * bits to the device instance data as we write the value
3814 * to the actual misc control register.
3815 */
3816 info->misc_ctrl_value = 0x087e4546;
3817
3818 /* initial port state is unknown - if startup errors
3819 * occur, init_error will be set to indicate the
3820 * problem. Once the port is fully initialized,
3821 * this value will be set to 0 to indicate the
3822 * port is available.
3823 */
3824 info->init_error = -1;
3825 }
3826
3827 return info;
3828 }
3829
device_init(int adapter_num,struct pci_dev * pdev)3830 static void device_init(int adapter_num, struct pci_dev *pdev)
3831 {
3832 SLMP_INFO *port_array[SCA_MAX_PORTS];
3833 int port;
3834
3835 /* allocate device instances for up to SCA_MAX_PORTS devices */
3836 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3837 port_array[port] = alloc_dev(adapter_num,port,pdev);
3838 if( port_array[port] == NULL ) {
3839 for (--port; port >= 0; --port) {
3840 tty_port_destroy(&port_array[port]->port);
3841 kfree(port_array[port]);
3842 }
3843 return;
3844 }
3845 }
3846
3847 /* give copy of port_array to all ports and add to device list */
3848 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3849 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3850 add_device( port_array[port] );
3851 spin_lock_init(&port_array[port]->lock);
3852 }
3853
3854 /* Allocate and claim adapter resources */
3855 if ( !claim_resources(port_array[0]) ) {
3856
3857 alloc_dma_bufs(port_array[0]);
3858
3859 /* copy resource information from first port to others */
3860 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3861 port_array[port]->lock = port_array[0]->lock;
3862 port_array[port]->irq_level = port_array[0]->irq_level;
3863 port_array[port]->memory_base = port_array[0]->memory_base;
3864 port_array[port]->sca_base = port_array[0]->sca_base;
3865 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3866 port_array[port]->lcr_base = port_array[0]->lcr_base;
3867 alloc_dma_bufs(port_array[port]);
3868 }
3869
3870 if ( request_irq(port_array[0]->irq_level,
3871 synclinkmp_interrupt,
3872 port_array[0]->irq_flags,
3873 port_array[0]->device_name,
3874 port_array[0]) < 0 ) {
3875 printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3876 __FILE__,__LINE__,
3877 port_array[0]->device_name,
3878 port_array[0]->irq_level );
3879 }
3880 else {
3881 port_array[0]->irq_requested = true;
3882 adapter_test(port_array[0]);
3883 }
3884 }
3885 }
3886
3887 static const struct tty_operations ops = {
3888 .install = install,
3889 .open = open,
3890 .close = close,
3891 .write = write,
3892 .put_char = put_char,
3893 .flush_chars = flush_chars,
3894 .write_room = write_room,
3895 .chars_in_buffer = chars_in_buffer,
3896 .flush_buffer = flush_buffer,
3897 .ioctl = ioctl,
3898 .throttle = throttle,
3899 .unthrottle = unthrottle,
3900 .send_xchar = send_xchar,
3901 .break_ctl = set_break,
3902 .wait_until_sent = wait_until_sent,
3903 .set_termios = set_termios,
3904 .stop = tx_hold,
3905 .start = tx_release,
3906 .hangup = hangup,
3907 .tiocmget = tiocmget,
3908 .tiocmset = tiocmset,
3909 .get_icount = get_icount,
3910 .proc_fops = &synclinkmp_proc_fops,
3911 };
3912
3913
synclinkmp_cleanup(void)3914 static void synclinkmp_cleanup(void)
3915 {
3916 int rc;
3917 SLMP_INFO *info;
3918 SLMP_INFO *tmp;
3919
3920 printk("Unloading %s %s\n", driver_name, driver_version);
3921
3922 if (serial_driver) {
3923 if ((rc = tty_unregister_driver(serial_driver)))
3924 printk("%s(%d) failed to unregister tty driver err=%d\n",
3925 __FILE__,__LINE__,rc);
3926 put_tty_driver(serial_driver);
3927 }
3928
3929 /* reset devices */
3930 info = synclinkmp_device_list;
3931 while(info) {
3932 reset_port(info);
3933 info = info->next_device;
3934 }
3935
3936 /* release devices */
3937 info = synclinkmp_device_list;
3938 while(info) {
3939 #if SYNCLINK_GENERIC_HDLC
3940 hdlcdev_exit(info);
3941 #endif
3942 free_dma_bufs(info);
3943 free_tmp_rx_buf(info);
3944 if ( info->port_num == 0 ) {
3945 if (info->sca_base)
3946 write_reg(info, LPR, 1); /* set low power mode */
3947 release_resources(info);
3948 }
3949 tmp = info;
3950 info = info->next_device;
3951 tty_port_destroy(&tmp->port);
3952 kfree(tmp);
3953 }
3954
3955 pci_unregister_driver(&synclinkmp_pci_driver);
3956 }
3957
3958 /* Driver initialization entry point.
3959 */
3960
synclinkmp_init(void)3961 static int __init synclinkmp_init(void)
3962 {
3963 int rc;
3964
3965 if (break_on_load) {
3966 synclinkmp_get_text_ptr();
3967 BREAKPOINT();
3968 }
3969
3970 printk("%s %s\n", driver_name, driver_version);
3971
3972 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3973 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3974 return rc;
3975 }
3976
3977 serial_driver = alloc_tty_driver(128);
3978 if (!serial_driver) {
3979 rc = -ENOMEM;
3980 goto error;
3981 }
3982
3983 /* Initialize the tty_driver structure */
3984
3985 serial_driver->driver_name = "synclinkmp";
3986 serial_driver->name = "ttySLM";
3987 serial_driver->major = ttymajor;
3988 serial_driver->minor_start = 64;
3989 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3990 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3991 serial_driver->init_termios = tty_std_termios;
3992 serial_driver->init_termios.c_cflag =
3993 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3994 serial_driver->init_termios.c_ispeed = 9600;
3995 serial_driver->init_termios.c_ospeed = 9600;
3996 serial_driver->flags = TTY_DRIVER_REAL_RAW;
3997 tty_set_operations(serial_driver, &ops);
3998 if ((rc = tty_register_driver(serial_driver)) < 0) {
3999 printk("%s(%d):Couldn't register serial driver\n",
4000 __FILE__,__LINE__);
4001 put_tty_driver(serial_driver);
4002 serial_driver = NULL;
4003 goto error;
4004 }
4005
4006 printk("%s %s, tty major#%d\n",
4007 driver_name, driver_version,
4008 serial_driver->major);
4009
4010 return 0;
4011
4012 error:
4013 synclinkmp_cleanup();
4014 return rc;
4015 }
4016
synclinkmp_exit(void)4017 static void __exit synclinkmp_exit(void)
4018 {
4019 synclinkmp_cleanup();
4020 }
4021
4022 module_init(synclinkmp_init);
4023 module_exit(synclinkmp_exit);
4024
4025 /* Set the port for internal loopback mode.
4026 * The TxCLK and RxCLK signals are generated from the BRG and
4027 * the TxD is looped back to the RxD internally.
4028 */
enable_loopback(SLMP_INFO * info,int enable)4029 static void enable_loopback(SLMP_INFO *info, int enable)
4030 {
4031 if (enable) {
4032 /* MD2 (Mode Register 2)
4033 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4034 */
4035 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4036
4037 /* degate external TxC clock source */
4038 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4039 write_control_reg(info);
4040
4041 /* RXS/TXS (Rx/Tx clock source)
4042 * 07 Reserved, must be 0
4043 * 06..04 Clock Source, 100=BRG
4044 * 03..00 Clock Divisor, 0000=1
4045 */
4046 write_reg(info, RXS, 0x40);
4047 write_reg(info, TXS, 0x40);
4048
4049 } else {
4050 /* MD2 (Mode Register 2)
4051 * 01..00 CNCT<1..0> Channel connection, 0=normal
4052 */
4053 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4054
4055 /* RXS/TXS (Rx/Tx clock source)
4056 * 07 Reserved, must be 0
4057 * 06..04 Clock Source, 000=RxC/TxC Pin
4058 * 03..00 Clock Divisor, 0000=1
4059 */
4060 write_reg(info, RXS, 0x00);
4061 write_reg(info, TXS, 0x00);
4062 }
4063
4064 /* set LinkSpeed if available, otherwise default to 2Mbps */
4065 if (info->params.clock_speed)
4066 set_rate(info, info->params.clock_speed);
4067 else
4068 set_rate(info, 3686400);
4069 }
4070
4071 /* Set the baud rate register to the desired speed
4072 *
4073 * data_rate data rate of clock in bits per second
4074 * A data rate of 0 disables the AUX clock.
4075 */
set_rate(SLMP_INFO * info,u32 data_rate)4076 static void set_rate( SLMP_INFO *info, u32 data_rate )
4077 {
4078 u32 TMCValue;
4079 unsigned char BRValue;
4080 u32 Divisor=0;
4081
4082 /* fBRG = fCLK/(TMC * 2^BR)
4083 */
4084 if (data_rate != 0) {
4085 Divisor = 14745600/data_rate;
4086 if (!Divisor)
4087 Divisor = 1;
4088
4089 TMCValue = Divisor;
4090
4091 BRValue = 0;
4092 if (TMCValue != 1 && TMCValue != 2) {
4093 /* BRValue of 0 provides 50/50 duty cycle *only* when
4094 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4095 * 50/50 duty cycle.
4096 */
4097 BRValue = 1;
4098 TMCValue >>= 1;
4099 }
4100
4101 /* while TMCValue is too big for TMC register, divide
4102 * by 2 and increment BR exponent.
4103 */
4104 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4105 TMCValue >>= 1;
4106
4107 write_reg(info, TXS,
4108 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4109 write_reg(info, RXS,
4110 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4111 write_reg(info, TMC, (unsigned char)TMCValue);
4112 }
4113 else {
4114 write_reg(info, TXS,0);
4115 write_reg(info, RXS,0);
4116 write_reg(info, TMC, 0);
4117 }
4118 }
4119
4120 /* Disable receiver
4121 */
rx_stop(SLMP_INFO * info)4122 static void rx_stop(SLMP_INFO *info)
4123 {
4124 if (debug_level >= DEBUG_LEVEL_ISR)
4125 printk("%s(%d):%s rx_stop()\n",
4126 __FILE__,__LINE__, info->device_name );
4127
4128 write_reg(info, CMD, RXRESET);
4129
4130 info->ie0_value &= ~RXRDYE;
4131 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4132
4133 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4134 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4135 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4136
4137 info->rx_enabled = false;
4138 info->rx_overflow = false;
4139 }
4140
4141 /* enable the receiver
4142 */
rx_start(SLMP_INFO * info)4143 static void rx_start(SLMP_INFO *info)
4144 {
4145 int i;
4146
4147 if (debug_level >= DEBUG_LEVEL_ISR)
4148 printk("%s(%d):%s rx_start()\n",
4149 __FILE__,__LINE__, info->device_name );
4150
4151 write_reg(info, CMD, RXRESET);
4152
4153 if ( info->params.mode == MGSL_MODE_HDLC ) {
4154 /* HDLC, disabe IRQ on rxdata */
4155 info->ie0_value &= ~RXRDYE;
4156 write_reg(info, IE0, info->ie0_value);
4157
4158 /* Reset all Rx DMA buffers and program rx dma */
4159 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4160 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4161
4162 for (i = 0; i < info->rx_buf_count; i++) {
4163 info->rx_buf_list[i].status = 0xff;
4164
4165 // throttle to 4 shared memory writes at a time to prevent
4166 // hogging local bus (keep latency time for DMA requests low).
4167 if (!(i % 4))
4168 read_status_reg(info);
4169 }
4170 info->current_rx_buf = 0;
4171
4172 /* set current/1st descriptor address */
4173 write_reg16(info, RXDMA + CDA,
4174 info->rx_buf_list_ex[0].phys_entry);
4175
4176 /* set new last rx descriptor address */
4177 write_reg16(info, RXDMA + EDA,
4178 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4179
4180 /* set buffer length (shared by all rx dma data buffers) */
4181 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4182
4183 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4184 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4185 } else {
4186 /* async, enable IRQ on rxdata */
4187 info->ie0_value |= RXRDYE;
4188 write_reg(info, IE0, info->ie0_value);
4189 }
4190
4191 write_reg(info, CMD, RXENABLE);
4192
4193 info->rx_overflow = false;
4194 info->rx_enabled = true;
4195 }
4196
4197 /* Enable the transmitter and send a transmit frame if
4198 * one is loaded in the DMA buffers.
4199 */
tx_start(SLMP_INFO * info)4200 static void tx_start(SLMP_INFO *info)
4201 {
4202 if (debug_level >= DEBUG_LEVEL_ISR)
4203 printk("%s(%d):%s tx_start() tx_count=%d\n",
4204 __FILE__,__LINE__, info->device_name,info->tx_count );
4205
4206 if (!info->tx_enabled ) {
4207 write_reg(info, CMD, TXRESET);
4208 write_reg(info, CMD, TXENABLE);
4209 info->tx_enabled = true;
4210 }
4211
4212 if ( info->tx_count ) {
4213
4214 /* If auto RTS enabled and RTS is inactive, then assert */
4215 /* RTS and set a flag indicating that the driver should */
4216 /* negate RTS when the transmission completes. */
4217
4218 info->drop_rts_on_tx_done = false;
4219
4220 if (info->params.mode != MGSL_MODE_ASYNC) {
4221
4222 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4223 get_signals( info );
4224 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4225 info->serial_signals |= SerialSignal_RTS;
4226 set_signals( info );
4227 info->drop_rts_on_tx_done = true;
4228 }
4229 }
4230
4231 write_reg16(info, TRC0,
4232 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4233
4234 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4235 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4236
4237 /* set TX CDA (current descriptor address) */
4238 write_reg16(info, TXDMA + CDA,
4239 info->tx_buf_list_ex[0].phys_entry);
4240
4241 /* set TX EDA (last descriptor address) */
4242 write_reg16(info, TXDMA + EDA,
4243 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4244
4245 /* enable underrun IRQ */
4246 info->ie1_value &= ~IDLE;
4247 info->ie1_value |= UDRN;
4248 write_reg(info, IE1, info->ie1_value);
4249 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4250
4251 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4252 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4253
4254 mod_timer(&info->tx_timer, jiffies +
4255 msecs_to_jiffies(5000));
4256 }
4257 else {
4258 tx_load_fifo(info);
4259 /* async, enable IRQ on txdata */
4260 info->ie0_value |= TXRDYE;
4261 write_reg(info, IE0, info->ie0_value);
4262 }
4263
4264 info->tx_active = true;
4265 }
4266 }
4267
4268 /* stop the transmitter and DMA
4269 */
tx_stop(SLMP_INFO * info)4270 static void tx_stop( SLMP_INFO *info )
4271 {
4272 if (debug_level >= DEBUG_LEVEL_ISR)
4273 printk("%s(%d):%s tx_stop()\n",
4274 __FILE__,__LINE__, info->device_name );
4275
4276 del_timer(&info->tx_timer);
4277
4278 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4279 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4280
4281 write_reg(info, CMD, TXRESET);
4282
4283 info->ie1_value &= ~(UDRN + IDLE);
4284 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4285 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4286
4287 info->ie0_value &= ~TXRDYE;
4288 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4289
4290 info->tx_enabled = false;
4291 info->tx_active = false;
4292 }
4293
4294 /* Fill the transmit FIFO until the FIFO is full or
4295 * there is no more data to load.
4296 */
tx_load_fifo(SLMP_INFO * info)4297 static void tx_load_fifo(SLMP_INFO *info)
4298 {
4299 u8 TwoBytes[2];
4300
4301 /* do nothing is now tx data available and no XON/XOFF pending */
4302
4303 if ( !info->tx_count && !info->x_char )
4304 return;
4305
4306 /* load the Transmit FIFO until FIFOs full or all data sent */
4307
4308 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4309
4310 /* there is more space in the transmit FIFO and */
4311 /* there is more data in transmit buffer */
4312
4313 if ( (info->tx_count > 1) && !info->x_char ) {
4314 /* write 16-bits */
4315 TwoBytes[0] = info->tx_buf[info->tx_get++];
4316 if (info->tx_get >= info->max_frame_size)
4317 info->tx_get -= info->max_frame_size;
4318 TwoBytes[1] = info->tx_buf[info->tx_get++];
4319 if (info->tx_get >= info->max_frame_size)
4320 info->tx_get -= info->max_frame_size;
4321
4322 write_reg16(info, TRB, *((u16 *)TwoBytes));
4323
4324 info->tx_count -= 2;
4325 info->icount.tx += 2;
4326 } else {
4327 /* only 1 byte left to transmit or 1 FIFO slot left */
4328
4329 if (info->x_char) {
4330 /* transmit pending high priority char */
4331 write_reg(info, TRB, info->x_char);
4332 info->x_char = 0;
4333 } else {
4334 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4335 if (info->tx_get >= info->max_frame_size)
4336 info->tx_get -= info->max_frame_size;
4337 info->tx_count--;
4338 }
4339 info->icount.tx++;
4340 }
4341 }
4342 }
4343
4344 /* Reset a port to a known state
4345 */
reset_port(SLMP_INFO * info)4346 static void reset_port(SLMP_INFO *info)
4347 {
4348 if (info->sca_base) {
4349
4350 tx_stop(info);
4351 rx_stop(info);
4352
4353 info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4354 set_signals(info);
4355
4356 /* disable all port interrupts */
4357 info->ie0_value = 0;
4358 info->ie1_value = 0;
4359 info->ie2_value = 0;
4360 write_reg(info, IE0, info->ie0_value);
4361 write_reg(info, IE1, info->ie1_value);
4362 write_reg(info, IE2, info->ie2_value);
4363
4364 write_reg(info, CMD, CHRESET);
4365 }
4366 }
4367
4368 /* Reset all the ports to a known state.
4369 */
reset_adapter(SLMP_INFO * info)4370 static void reset_adapter(SLMP_INFO *info)
4371 {
4372 int i;
4373
4374 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4375 if (info->port_array[i])
4376 reset_port(info->port_array[i]);
4377 }
4378 }
4379
4380 /* Program port for asynchronous communications.
4381 */
async_mode(SLMP_INFO * info)4382 static void async_mode(SLMP_INFO *info)
4383 {
4384
4385 unsigned char RegValue;
4386
4387 tx_stop(info);
4388 rx_stop(info);
4389
4390 /* MD0, Mode Register 0
4391 *
4392 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4393 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4394 * 03 Reserved, must be 0
4395 * 02 CRCCC, CRC Calculation, 0=disabled
4396 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4397 *
4398 * 0000 0000
4399 */
4400 RegValue = 0x00;
4401 if (info->params.stop_bits != 1)
4402 RegValue |= BIT1;
4403 write_reg(info, MD0, RegValue);
4404
4405 /* MD1, Mode Register 1
4406 *
4407 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4408 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4409 * 03..02 RXCHR<1..0>, rx char size
4410 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4411 *
4412 * 0100 0000
4413 */
4414 RegValue = 0x40;
4415 switch (info->params.data_bits) {
4416 case 7: RegValue |= BIT4 + BIT2; break;
4417 case 6: RegValue |= BIT5 + BIT3; break;
4418 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4419 }
4420 if (info->params.parity != ASYNC_PARITY_NONE) {
4421 RegValue |= BIT1;
4422 if (info->params.parity == ASYNC_PARITY_ODD)
4423 RegValue |= BIT0;
4424 }
4425 write_reg(info, MD1, RegValue);
4426
4427 /* MD2, Mode Register 2
4428 *
4429 * 07..02 Reserved, must be 0
4430 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4431 *
4432 * 0000 0000
4433 */
4434 RegValue = 0x00;
4435 if (info->params.loopback)
4436 RegValue |= (BIT1 + BIT0);
4437 write_reg(info, MD2, RegValue);
4438
4439 /* RXS, Receive clock source
4440 *
4441 * 07 Reserved, must be 0
4442 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4443 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4444 */
4445 RegValue=BIT6;
4446 write_reg(info, RXS, RegValue);
4447
4448 /* TXS, Transmit clock source
4449 *
4450 * 07 Reserved, must be 0
4451 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4452 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4453 */
4454 RegValue=BIT6;
4455 write_reg(info, TXS, RegValue);
4456
4457 /* Control Register
4458 *
4459 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4460 */
4461 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4462 write_control_reg(info);
4463
4464 tx_set_idle(info);
4465
4466 /* RRC Receive Ready Control 0
4467 *
4468 * 07..05 Reserved, must be 0
4469 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4470 */
4471 write_reg(info, RRC, 0x00);
4472
4473 /* TRC0 Transmit Ready Control 0
4474 *
4475 * 07..05 Reserved, must be 0
4476 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4477 */
4478 write_reg(info, TRC0, 0x10);
4479
4480 /* TRC1 Transmit Ready Control 1
4481 *
4482 * 07..05 Reserved, must be 0
4483 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4484 */
4485 write_reg(info, TRC1, 0x1e);
4486
4487 /* CTL, MSCI control register
4488 *
4489 * 07..06 Reserved, set to 0
4490 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4491 * 04 IDLC, idle control, 0=mark 1=idle register
4492 * 03 BRK, break, 0=off 1 =on (async)
4493 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4494 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4495 * 00 RTS, RTS output control, 0=active 1=inactive
4496 *
4497 * 0001 0001
4498 */
4499 RegValue = 0x10;
4500 if (!(info->serial_signals & SerialSignal_RTS))
4501 RegValue |= 0x01;
4502 write_reg(info, CTL, RegValue);
4503
4504 /* enable status interrupts */
4505 info->ie0_value |= TXINTE + RXINTE;
4506 write_reg(info, IE0, info->ie0_value);
4507
4508 /* enable break detect interrupt */
4509 info->ie1_value = BRKD;
4510 write_reg(info, IE1, info->ie1_value);
4511
4512 /* enable rx overrun interrupt */
4513 info->ie2_value = OVRN;
4514 write_reg(info, IE2, info->ie2_value);
4515
4516 set_rate( info, info->params.data_rate * 16 );
4517 }
4518
4519 /* Program the SCA for HDLC communications.
4520 */
hdlc_mode(SLMP_INFO * info)4521 static void hdlc_mode(SLMP_INFO *info)
4522 {
4523 unsigned char RegValue;
4524 u32 DpllDivisor;
4525
4526 // Can't use DPLL because SCA outputs recovered clock on RxC when
4527 // DPLL mode selected. This causes output contention with RxC receiver.
4528 // Use of DPLL would require external hardware to disable RxC receiver
4529 // when DPLL mode selected.
4530 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4531
4532 /* disable DMA interrupts */
4533 write_reg(info, TXDMA + DIR, 0);
4534 write_reg(info, RXDMA + DIR, 0);
4535
4536 /* MD0, Mode Register 0
4537 *
4538 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4539 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4540 * 03 Reserved, must be 0
4541 * 02 CRCCC, CRC Calculation, 1=enabled
4542 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4543 * 00 CRC0, CRC initial value, 1 = all 1s
4544 *
4545 * 1000 0001
4546 */
4547 RegValue = 0x81;
4548 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4549 RegValue |= BIT4;
4550 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4551 RegValue |= BIT4;
4552 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4553 RegValue |= BIT2 + BIT1;
4554 write_reg(info, MD0, RegValue);
4555
4556 /* MD1, Mode Register 1
4557 *
4558 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4559 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4560 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4561 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4562 *
4563 * 0000 0000
4564 */
4565 RegValue = 0x00;
4566 write_reg(info, MD1, RegValue);
4567
4568 /* MD2, Mode Register 2
4569 *
4570 * 07 NRZFM, 0=NRZ, 1=FM
4571 * 06..05 CODE<1..0> Encoding, 00=NRZ
4572 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4573 * 02 Reserved, must be 0
4574 * 01..00 CNCT<1..0> Channel connection, 0=normal
4575 *
4576 * 0000 0000
4577 */
4578 RegValue = 0x00;
4579 switch(info->params.encoding) {
4580 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4581 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4582 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4583 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4584 #if 0
4585 case HDLC_ENCODING_NRZB: /* not supported */
4586 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4587 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4588 #endif
4589 }
4590 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4591 DpllDivisor = 16;
4592 RegValue |= BIT3;
4593 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4594 DpllDivisor = 8;
4595 } else {
4596 DpllDivisor = 32;
4597 RegValue |= BIT4;
4598 }
4599 write_reg(info, MD2, RegValue);
4600
4601
4602 /* RXS, Receive clock source
4603 *
4604 * 07 Reserved, must be 0
4605 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4606 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4607 */
4608 RegValue=0;
4609 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4610 RegValue |= BIT6;
4611 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4612 RegValue |= BIT6 + BIT5;
4613 write_reg(info, RXS, RegValue);
4614
4615 /* TXS, Transmit clock source
4616 *
4617 * 07 Reserved, must be 0
4618 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4619 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4620 */
4621 RegValue=0;
4622 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4623 RegValue |= BIT6;
4624 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4625 RegValue |= BIT6 + BIT5;
4626 write_reg(info, TXS, RegValue);
4627
4628 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4629 set_rate(info, info->params.clock_speed * DpllDivisor);
4630 else
4631 set_rate(info, info->params.clock_speed);
4632
4633 /* GPDATA (General Purpose I/O Data Register)
4634 *
4635 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4636 */
4637 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4638 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4639 else
4640 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4641 write_control_reg(info);
4642
4643 /* RRC Receive Ready Control 0
4644 *
4645 * 07..05 Reserved, must be 0
4646 * 04..00 RRC<4..0> Rx FIFO trigger active
4647 */
4648 write_reg(info, RRC, rx_active_fifo_level);
4649
4650 /* TRC0 Transmit Ready Control 0
4651 *
4652 * 07..05 Reserved, must be 0
4653 * 04..00 TRC<4..0> Tx FIFO trigger active
4654 */
4655 write_reg(info, TRC0, tx_active_fifo_level);
4656
4657 /* TRC1 Transmit Ready Control 1
4658 *
4659 * 07..05 Reserved, must be 0
4660 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4661 */
4662 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4663
4664 /* DMR, DMA Mode Register
4665 *
4666 * 07..05 Reserved, must be 0
4667 * 04 TMOD, Transfer Mode: 1=chained-block
4668 * 03 Reserved, must be 0
4669 * 02 NF, Number of Frames: 1=multi-frame
4670 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4671 * 00 Reserved, must be 0
4672 *
4673 * 0001 0100
4674 */
4675 write_reg(info, TXDMA + DMR, 0x14);
4676 write_reg(info, RXDMA + DMR, 0x14);
4677
4678 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4679 write_reg(info, RXDMA + CPB,
4680 (unsigned char)(info->buffer_list_phys >> 16));
4681
4682 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4683 write_reg(info, TXDMA + CPB,
4684 (unsigned char)(info->buffer_list_phys >> 16));
4685
4686 /* enable status interrupts. other code enables/disables
4687 * the individual sources for these two interrupt classes.
4688 */
4689 info->ie0_value |= TXINTE + RXINTE;
4690 write_reg(info, IE0, info->ie0_value);
4691
4692 /* CTL, MSCI control register
4693 *
4694 * 07..06 Reserved, set to 0
4695 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4696 * 04 IDLC, idle control, 0=mark 1=idle register
4697 * 03 BRK, break, 0=off 1 =on (async)
4698 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4699 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4700 * 00 RTS, RTS output control, 0=active 1=inactive
4701 *
4702 * 0001 0001
4703 */
4704 RegValue = 0x10;
4705 if (!(info->serial_signals & SerialSignal_RTS))
4706 RegValue |= 0x01;
4707 write_reg(info, CTL, RegValue);
4708
4709 /* preamble not supported ! */
4710
4711 tx_set_idle(info);
4712 tx_stop(info);
4713 rx_stop(info);
4714
4715 set_rate(info, info->params.clock_speed);
4716
4717 if (info->params.loopback)
4718 enable_loopback(info,1);
4719 }
4720
4721 /* Set the transmit HDLC idle mode
4722 */
tx_set_idle(SLMP_INFO * info)4723 static void tx_set_idle(SLMP_INFO *info)
4724 {
4725 unsigned char RegValue = 0xff;
4726
4727 /* Map API idle mode to SCA register bits */
4728 switch(info->idle_mode) {
4729 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4730 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4731 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4732 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4733 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4734 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4735 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4736 }
4737
4738 write_reg(info, IDL, RegValue);
4739 }
4740
4741 /* Query the adapter for the state of the V24 status (input) signals.
4742 */
get_signals(SLMP_INFO * info)4743 static void get_signals(SLMP_INFO *info)
4744 {
4745 u16 status = read_reg(info, SR3);
4746 u16 gpstatus = read_status_reg(info);
4747 u16 testbit;
4748
4749 /* clear all serial signals except RTS and DTR */
4750 info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR;
4751
4752 /* set serial signal bits to reflect MISR */
4753
4754 if (!(status & BIT3))
4755 info->serial_signals |= SerialSignal_CTS;
4756
4757 if ( !(status & BIT2))
4758 info->serial_signals |= SerialSignal_DCD;
4759
4760 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4761 if (!(gpstatus & testbit))
4762 info->serial_signals |= SerialSignal_RI;
4763
4764 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4765 if (!(gpstatus & testbit))
4766 info->serial_signals |= SerialSignal_DSR;
4767 }
4768
4769 /* Set the state of RTS and DTR based on contents of
4770 * serial_signals member of device context.
4771 */
set_signals(SLMP_INFO * info)4772 static void set_signals(SLMP_INFO *info)
4773 {
4774 unsigned char RegValue;
4775 u16 EnableBit;
4776
4777 RegValue = read_reg(info, CTL);
4778 if (info->serial_signals & SerialSignal_RTS)
4779 RegValue &= ~BIT0;
4780 else
4781 RegValue |= BIT0;
4782 write_reg(info, CTL, RegValue);
4783
4784 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4785 EnableBit = BIT1 << (info->port_num*2);
4786 if (info->serial_signals & SerialSignal_DTR)
4787 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4788 else
4789 info->port_array[0]->ctrlreg_value |= EnableBit;
4790 write_control_reg(info);
4791 }
4792
4793 /*******************/
4794 /* DMA Buffer Code */
4795 /*******************/
4796
4797 /* Set the count for all receive buffers to SCABUFSIZE
4798 * and set the current buffer to the first buffer. This effectively
4799 * makes all buffers free and discards any data in buffers.
4800 */
rx_reset_buffers(SLMP_INFO * info)4801 static void rx_reset_buffers(SLMP_INFO *info)
4802 {
4803 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4804 }
4805
4806 /* Free the buffers used by a received frame
4807 *
4808 * info pointer to device instance data
4809 * first index of 1st receive buffer of frame
4810 * last index of last receive buffer of frame
4811 */
rx_free_frame_buffers(SLMP_INFO * info,unsigned int first,unsigned int last)4812 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4813 {
4814 bool done = false;
4815
4816 while(!done) {
4817 /* reset current buffer for reuse */
4818 info->rx_buf_list[first].status = 0xff;
4819
4820 if (first == last) {
4821 done = true;
4822 /* set new last rx descriptor address */
4823 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4824 }
4825
4826 first++;
4827 if (first == info->rx_buf_count)
4828 first = 0;
4829 }
4830
4831 /* set current buffer to next buffer after last buffer of frame */
4832 info->current_rx_buf = first;
4833 }
4834
4835 /* Return a received frame from the receive DMA buffers.
4836 * Only frames received without errors are returned.
4837 *
4838 * Return Value: true if frame returned, otherwise false
4839 */
rx_get_frame(SLMP_INFO * info)4840 static bool rx_get_frame(SLMP_INFO *info)
4841 {
4842 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4843 unsigned short status;
4844 unsigned int framesize = 0;
4845 bool ReturnCode = false;
4846 unsigned long flags;
4847 struct tty_struct *tty = info->port.tty;
4848 unsigned char addr_field = 0xff;
4849 SCADESC *desc;
4850 SCADESC_EX *desc_ex;
4851
4852 CheckAgain:
4853 /* assume no frame returned, set zero length */
4854 framesize = 0;
4855 addr_field = 0xff;
4856
4857 /*
4858 * current_rx_buf points to the 1st buffer of the next available
4859 * receive frame. To find the last buffer of the frame look for
4860 * a non-zero status field in the buffer entries. (The status
4861 * field is set by the 16C32 after completing a receive frame.
4862 */
4863 StartIndex = EndIndex = info->current_rx_buf;
4864
4865 for ( ;; ) {
4866 desc = &info->rx_buf_list[EndIndex];
4867 desc_ex = &info->rx_buf_list_ex[EndIndex];
4868
4869 if (desc->status == 0xff)
4870 goto Cleanup; /* current desc still in use, no frames available */
4871
4872 if (framesize == 0 && info->params.addr_filter != 0xff)
4873 addr_field = desc_ex->virt_addr[0];
4874
4875 framesize += desc->length;
4876
4877 /* Status != 0 means last buffer of frame */
4878 if (desc->status)
4879 break;
4880
4881 EndIndex++;
4882 if (EndIndex == info->rx_buf_count)
4883 EndIndex = 0;
4884
4885 if (EndIndex == info->current_rx_buf) {
4886 /* all buffers have been 'used' but none mark */
4887 /* the end of a frame. Reset buffers and receiver. */
4888 if ( info->rx_enabled ){
4889 spin_lock_irqsave(&info->lock,flags);
4890 rx_start(info);
4891 spin_unlock_irqrestore(&info->lock,flags);
4892 }
4893 goto Cleanup;
4894 }
4895
4896 }
4897
4898 /* check status of receive frame */
4899
4900 /* frame status is byte stored after frame data
4901 *
4902 * 7 EOM (end of msg), 1 = last buffer of frame
4903 * 6 Short Frame, 1 = short frame
4904 * 5 Abort, 1 = frame aborted
4905 * 4 Residue, 1 = last byte is partial
4906 * 3 Overrun, 1 = overrun occurred during frame reception
4907 * 2 CRC, 1 = CRC error detected
4908 *
4909 */
4910 status = desc->status;
4911
4912 /* ignore CRC bit if not using CRC (bit is undefined) */
4913 /* Note:CRC is not save to data buffer */
4914 if (info->params.crc_type == HDLC_CRC_NONE)
4915 status &= ~BIT2;
4916
4917 if (framesize == 0 ||
4918 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4919 /* discard 0 byte frames, this seems to occur sometime
4920 * when remote is idling flags.
4921 */
4922 rx_free_frame_buffers(info, StartIndex, EndIndex);
4923 goto CheckAgain;
4924 }
4925
4926 if (framesize < 2)
4927 status |= BIT6;
4928
4929 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4930 /* received frame has errors,
4931 * update counts and mark frame size as 0
4932 */
4933 if (status & BIT6)
4934 info->icount.rxshort++;
4935 else if (status & BIT5)
4936 info->icount.rxabort++;
4937 else if (status & BIT3)
4938 info->icount.rxover++;
4939 else
4940 info->icount.rxcrc++;
4941
4942 framesize = 0;
4943 #if SYNCLINK_GENERIC_HDLC
4944 {
4945 info->netdev->stats.rx_errors++;
4946 info->netdev->stats.rx_frame_errors++;
4947 }
4948 #endif
4949 }
4950
4951 if ( debug_level >= DEBUG_LEVEL_BH )
4952 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4953 __FILE__,__LINE__,info->device_name,status,framesize);
4954
4955 if ( debug_level >= DEBUG_LEVEL_DATA )
4956 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4957 min_t(unsigned int, framesize, SCABUFSIZE), 0);
4958
4959 if (framesize) {
4960 if (framesize > info->max_frame_size)
4961 info->icount.rxlong++;
4962 else {
4963 /* copy dma buffer(s) to contiguous intermediate buffer */
4964 int copy_count = framesize;
4965 int index = StartIndex;
4966 unsigned char *ptmp = info->tmp_rx_buf;
4967 info->tmp_rx_buf_count = framesize;
4968
4969 info->icount.rxok++;
4970
4971 while(copy_count) {
4972 int partial_count = min(copy_count,SCABUFSIZE);
4973 memcpy( ptmp,
4974 info->rx_buf_list_ex[index].virt_addr,
4975 partial_count );
4976 ptmp += partial_count;
4977 copy_count -= partial_count;
4978
4979 if ( ++index == info->rx_buf_count )
4980 index = 0;
4981 }
4982
4983 #if SYNCLINK_GENERIC_HDLC
4984 if (info->netcount)
4985 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4986 else
4987 #endif
4988 ldisc_receive_buf(tty,info->tmp_rx_buf,
4989 info->flag_buf, framesize);
4990 }
4991 }
4992 /* Free the buffers used by this frame. */
4993 rx_free_frame_buffers( info, StartIndex, EndIndex );
4994
4995 ReturnCode = true;
4996
4997 Cleanup:
4998 if ( info->rx_enabled && info->rx_overflow ) {
4999 /* Receiver is enabled, but needs to restarted due to
5000 * rx buffer overflow. If buffers are empty, restart receiver.
5001 */
5002 if (info->rx_buf_list[EndIndex].status == 0xff) {
5003 spin_lock_irqsave(&info->lock,flags);
5004 rx_start(info);
5005 spin_unlock_irqrestore(&info->lock,flags);
5006 }
5007 }
5008
5009 return ReturnCode;
5010 }
5011
5012 /* load the transmit DMA buffer with data
5013 */
tx_load_dma_buffer(SLMP_INFO * info,const char * buf,unsigned int count)5014 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5015 {
5016 unsigned short copy_count;
5017 unsigned int i = 0;
5018 SCADESC *desc;
5019 SCADESC_EX *desc_ex;
5020
5021 if ( debug_level >= DEBUG_LEVEL_DATA )
5022 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5023
5024 /* Copy source buffer to one or more DMA buffers, starting with
5025 * the first transmit dma buffer.
5026 */
5027 for(i=0;;)
5028 {
5029 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5030
5031 desc = &info->tx_buf_list[i];
5032 desc_ex = &info->tx_buf_list_ex[i];
5033
5034 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5035
5036 desc->length = copy_count;
5037 desc->status = 0;
5038
5039 buf += copy_count;
5040 count -= copy_count;
5041
5042 if (!count)
5043 break;
5044
5045 i++;
5046 if (i >= info->tx_buf_count)
5047 i = 0;
5048 }
5049
5050 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5051 info->last_tx_buf = ++i;
5052 }
5053
register_test(SLMP_INFO * info)5054 static bool register_test(SLMP_INFO *info)
5055 {
5056 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5057 static unsigned int count = ARRAY_SIZE(testval);
5058 unsigned int i;
5059 bool rc = true;
5060 unsigned long flags;
5061
5062 spin_lock_irqsave(&info->lock,flags);
5063 reset_port(info);
5064
5065 /* assume failure */
5066 info->init_error = DiagStatus_AddressFailure;
5067
5068 /* Write bit patterns to various registers but do it out of */
5069 /* sync, then read back and verify values. */
5070
5071 for (i = 0 ; i < count ; i++) {
5072 write_reg(info, TMC, testval[i]);
5073 write_reg(info, IDL, testval[(i+1)%count]);
5074 write_reg(info, SA0, testval[(i+2)%count]);
5075 write_reg(info, SA1, testval[(i+3)%count]);
5076
5077 if ( (read_reg(info, TMC) != testval[i]) ||
5078 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5079 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5080 (read_reg(info, SA1) != testval[(i+3)%count]) )
5081 {
5082 rc = false;
5083 break;
5084 }
5085 }
5086
5087 reset_port(info);
5088 spin_unlock_irqrestore(&info->lock,flags);
5089
5090 return rc;
5091 }
5092
irq_test(SLMP_INFO * info)5093 static bool irq_test(SLMP_INFO *info)
5094 {
5095 unsigned long timeout;
5096 unsigned long flags;
5097
5098 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5099
5100 spin_lock_irqsave(&info->lock,flags);
5101 reset_port(info);
5102
5103 /* assume failure */
5104 info->init_error = DiagStatus_IrqFailure;
5105 info->irq_occurred = false;
5106
5107 /* setup timer0 on SCA0 to interrupt */
5108
5109 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5110 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5111
5112 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5113 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5114
5115
5116 /* TMCS, Timer Control/Status Register
5117 *
5118 * 07 CMF, Compare match flag (read only) 1=match
5119 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5120 * 05 Reserved, must be 0
5121 * 04 TME, Timer Enable
5122 * 03..00 Reserved, must be 0
5123 *
5124 * 0101 0000
5125 */
5126 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5127
5128 spin_unlock_irqrestore(&info->lock,flags);
5129
5130 timeout=100;
5131 while( timeout-- && !info->irq_occurred ) {
5132 msleep_interruptible(10);
5133 }
5134
5135 spin_lock_irqsave(&info->lock,flags);
5136 reset_port(info);
5137 spin_unlock_irqrestore(&info->lock,flags);
5138
5139 return info->irq_occurred;
5140 }
5141
5142 /* initialize individual SCA device (2 ports)
5143 */
sca_init(SLMP_INFO * info)5144 static bool sca_init(SLMP_INFO *info)
5145 {
5146 /* set wait controller to single mem partition (low), no wait states */
5147 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5148 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5149 write_reg(info, WCRL, 0); /* wait controller low range */
5150 write_reg(info, WCRM, 0); /* wait controller mid range */
5151 write_reg(info, WCRH, 0); /* wait controller high range */
5152
5153 /* DPCR, DMA Priority Control
5154 *
5155 * 07..05 Not used, must be 0
5156 * 04 BRC, bus release condition: 0=all transfers complete
5157 * 03 CCC, channel change condition: 0=every cycle
5158 * 02..00 PR<2..0>, priority 100=round robin
5159 *
5160 * 00000100 = 0x04
5161 */
5162 write_reg(info, DPCR, dma_priority);
5163
5164 /* DMA Master Enable, BIT7: 1=enable all channels */
5165 write_reg(info, DMER, 0x80);
5166
5167 /* enable all interrupt classes */
5168 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5169 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5170 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5171
5172 /* ITCR, interrupt control register
5173 * 07 IPC, interrupt priority, 0=MSCI->DMA
5174 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5175 * 04 VOS, Vector Output, 0=unmodified vector
5176 * 03..00 Reserved, must be 0
5177 */
5178 write_reg(info, ITCR, 0);
5179
5180 return true;
5181 }
5182
5183 /* initialize adapter hardware
5184 */
init_adapter(SLMP_INFO * info)5185 static bool init_adapter(SLMP_INFO *info)
5186 {
5187 int i;
5188
5189 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5190 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5191 u32 readval;
5192
5193 info->misc_ctrl_value |= BIT30;
5194 *MiscCtrl = info->misc_ctrl_value;
5195
5196 /*
5197 * Force at least 170ns delay before clearing
5198 * reset bit. Each read from LCR takes at least
5199 * 30ns so 10 times for 300ns to be safe.
5200 */
5201 for(i=0;i<10;i++)
5202 readval = *MiscCtrl;
5203
5204 info->misc_ctrl_value &= ~BIT30;
5205 *MiscCtrl = info->misc_ctrl_value;
5206
5207 /* init control reg (all DTRs off, all clksel=input) */
5208 info->ctrlreg_value = 0xaa;
5209 write_control_reg(info);
5210
5211 {
5212 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5213 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5214
5215 switch(read_ahead_count)
5216 {
5217 case 16:
5218 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5219 break;
5220 case 8:
5221 lcr1_brdr_value |= BIT5 + BIT4;
5222 break;
5223 case 4:
5224 lcr1_brdr_value |= BIT5 + BIT3;
5225 break;
5226 case 0:
5227 lcr1_brdr_value |= BIT5;
5228 break;
5229 }
5230
5231 *LCR1BRDR = lcr1_brdr_value;
5232 *MiscCtrl = misc_ctrl_value;
5233 }
5234
5235 sca_init(info->port_array[0]);
5236 sca_init(info->port_array[2]);
5237
5238 return true;
5239 }
5240
5241 /* Loopback an HDLC frame to test the hardware
5242 * interrupt and DMA functions.
5243 */
loopback_test(SLMP_INFO * info)5244 static bool loopback_test(SLMP_INFO *info)
5245 {
5246 #define TESTFRAMESIZE 20
5247
5248 unsigned long timeout;
5249 u16 count = TESTFRAMESIZE;
5250 unsigned char buf[TESTFRAMESIZE];
5251 bool rc = false;
5252 unsigned long flags;
5253
5254 struct tty_struct *oldtty = info->port.tty;
5255 u32 speed = info->params.clock_speed;
5256
5257 info->params.clock_speed = 3686400;
5258 info->port.tty = NULL;
5259
5260 /* assume failure */
5261 info->init_error = DiagStatus_DmaFailure;
5262
5263 /* build and send transmit frame */
5264 for (count = 0; count < TESTFRAMESIZE;++count)
5265 buf[count] = (unsigned char)count;
5266
5267 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5268
5269 /* program hardware for HDLC and enabled receiver */
5270 spin_lock_irqsave(&info->lock,flags);
5271 hdlc_mode(info);
5272 enable_loopback(info,1);
5273 rx_start(info);
5274 info->tx_count = count;
5275 tx_load_dma_buffer(info,buf,count);
5276 tx_start(info);
5277 spin_unlock_irqrestore(&info->lock,flags);
5278
5279 /* wait for receive complete */
5280 /* Set a timeout for waiting for interrupt. */
5281 for ( timeout = 100; timeout; --timeout ) {
5282 msleep_interruptible(10);
5283
5284 if (rx_get_frame(info)) {
5285 rc = true;
5286 break;
5287 }
5288 }
5289
5290 /* verify received frame length and contents */
5291 if (rc &&
5292 ( info->tmp_rx_buf_count != count ||
5293 memcmp(buf, info->tmp_rx_buf,count))) {
5294 rc = false;
5295 }
5296
5297 spin_lock_irqsave(&info->lock,flags);
5298 reset_adapter(info);
5299 spin_unlock_irqrestore(&info->lock,flags);
5300
5301 info->params.clock_speed = speed;
5302 info->port.tty = oldtty;
5303
5304 return rc;
5305 }
5306
5307 /* Perform diagnostics on hardware
5308 */
adapter_test(SLMP_INFO * info)5309 static int adapter_test( SLMP_INFO *info )
5310 {
5311 unsigned long flags;
5312 if ( debug_level >= DEBUG_LEVEL_INFO )
5313 printk( "%s(%d):Testing device %s\n",
5314 __FILE__,__LINE__,info->device_name );
5315
5316 spin_lock_irqsave(&info->lock,flags);
5317 init_adapter(info);
5318 spin_unlock_irqrestore(&info->lock,flags);
5319
5320 info->port_array[0]->port_count = 0;
5321
5322 if ( register_test(info->port_array[0]) &&
5323 register_test(info->port_array[1])) {
5324
5325 info->port_array[0]->port_count = 2;
5326
5327 if ( register_test(info->port_array[2]) &&
5328 register_test(info->port_array[3]) )
5329 info->port_array[0]->port_count += 2;
5330 }
5331 else {
5332 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5333 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5334 return -ENODEV;
5335 }
5336
5337 if ( !irq_test(info->port_array[0]) ||
5338 !irq_test(info->port_array[1]) ||
5339 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5340 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5341 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5342 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5343 return -ENODEV;
5344 }
5345
5346 if (!loopback_test(info->port_array[0]) ||
5347 !loopback_test(info->port_array[1]) ||
5348 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5349 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5350 printk( "%s(%d):DMA test failure for device %s\n",
5351 __FILE__,__LINE__,info->device_name);
5352 return -ENODEV;
5353 }
5354
5355 if ( debug_level >= DEBUG_LEVEL_INFO )
5356 printk( "%s(%d):device %s passed diagnostics\n",
5357 __FILE__,__LINE__,info->device_name );
5358
5359 info->port_array[0]->init_error = 0;
5360 info->port_array[1]->init_error = 0;
5361 if ( info->port_count > 2 ) {
5362 info->port_array[2]->init_error = 0;
5363 info->port_array[3]->init_error = 0;
5364 }
5365
5366 return 0;
5367 }
5368
5369 /* Test the shared memory on a PCI adapter.
5370 */
memory_test(SLMP_INFO * info)5371 static bool memory_test(SLMP_INFO *info)
5372 {
5373 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5374 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5375 unsigned long count = ARRAY_SIZE(testval);
5376 unsigned long i;
5377 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5378 unsigned long * addr = (unsigned long *)info->memory_base;
5379
5380 /* Test data lines with test pattern at one location. */
5381
5382 for ( i = 0 ; i < count ; i++ ) {
5383 *addr = testval[i];
5384 if ( *addr != testval[i] )
5385 return false;
5386 }
5387
5388 /* Test address lines with incrementing pattern over */
5389 /* entire address range. */
5390
5391 for ( i = 0 ; i < limit ; i++ ) {
5392 *addr = i * 4;
5393 addr++;
5394 }
5395
5396 addr = (unsigned long *)info->memory_base;
5397
5398 for ( i = 0 ; i < limit ; i++ ) {
5399 if ( *addr != i * 4 )
5400 return false;
5401 addr++;
5402 }
5403
5404 memset( info->memory_base, 0, SCA_MEM_SIZE );
5405 return true;
5406 }
5407
5408 /* Load data into PCI adapter shared memory.
5409 *
5410 * The PCI9050 releases control of the local bus
5411 * after completing the current read or write operation.
5412 *
5413 * While the PCI9050 write FIFO not empty, the
5414 * PCI9050 treats all of the writes as a single transaction
5415 * and does not release the bus. This causes DMA latency problems
5416 * at high speeds when copying large data blocks to the shared memory.
5417 *
5418 * This function breaks a write into multiple transations by
5419 * interleaving a read which flushes the write FIFO and 'completes'
5420 * the write transation. This allows any pending DMA request to gain control
5421 * of the local bus in a timely fasion.
5422 */
load_pci_memory(SLMP_INFO * info,char * dest,const char * src,unsigned short count)5423 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5424 {
5425 /* A load interval of 16 allows for 4 32-bit writes at */
5426 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5427
5428 unsigned short interval = count / sca_pci_load_interval;
5429 unsigned short i;
5430
5431 for ( i = 0 ; i < interval ; i++ )
5432 {
5433 memcpy(dest, src, sca_pci_load_interval);
5434 read_status_reg(info);
5435 dest += sca_pci_load_interval;
5436 src += sca_pci_load_interval;
5437 }
5438
5439 memcpy(dest, src, count % sca_pci_load_interval);
5440 }
5441
trace_block(SLMP_INFO * info,const char * data,int count,int xmit)5442 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5443 {
5444 int i;
5445 int linecount;
5446 if (xmit)
5447 printk("%s tx data:\n",info->device_name);
5448 else
5449 printk("%s rx data:\n",info->device_name);
5450
5451 while(count) {
5452 if (count > 16)
5453 linecount = 16;
5454 else
5455 linecount = count;
5456
5457 for(i=0;i<linecount;i++)
5458 printk("%02X ",(unsigned char)data[i]);
5459 for(;i<17;i++)
5460 printk(" ");
5461 for(i=0;i<linecount;i++) {
5462 if (data[i]>=040 && data[i]<=0176)
5463 printk("%c",data[i]);
5464 else
5465 printk(".");
5466 }
5467 printk("\n");
5468
5469 data += linecount;
5470 count -= linecount;
5471 }
5472 } /* end of trace_block() */
5473
5474 /* called when HDLC frame times out
5475 * update stats and do tx completion processing
5476 */
tx_timeout(unsigned long context)5477 static void tx_timeout(unsigned long context)
5478 {
5479 SLMP_INFO *info = (SLMP_INFO*)context;
5480 unsigned long flags;
5481
5482 if ( debug_level >= DEBUG_LEVEL_INFO )
5483 printk( "%s(%d):%s tx_timeout()\n",
5484 __FILE__,__LINE__,info->device_name);
5485 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5486 info->icount.txtimeout++;
5487 }
5488 spin_lock_irqsave(&info->lock,flags);
5489 info->tx_active = false;
5490 info->tx_count = info->tx_put = info->tx_get = 0;
5491
5492 spin_unlock_irqrestore(&info->lock,flags);
5493
5494 #if SYNCLINK_GENERIC_HDLC
5495 if (info->netcount)
5496 hdlcdev_tx_done(info);
5497 else
5498 #endif
5499 bh_transmit(info);
5500 }
5501
5502 /* called to periodically check the DSR/RI modem signal input status
5503 */
status_timeout(unsigned long context)5504 static void status_timeout(unsigned long context)
5505 {
5506 u16 status = 0;
5507 SLMP_INFO *info = (SLMP_INFO*)context;
5508 unsigned long flags;
5509 unsigned char delta;
5510
5511
5512 spin_lock_irqsave(&info->lock,flags);
5513 get_signals(info);
5514 spin_unlock_irqrestore(&info->lock,flags);
5515
5516 /* check for DSR/RI state change */
5517
5518 delta = info->old_signals ^ info->serial_signals;
5519 info->old_signals = info->serial_signals;
5520
5521 if (delta & SerialSignal_DSR)
5522 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5523
5524 if (delta & SerialSignal_RI)
5525 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5526
5527 if (delta & SerialSignal_DCD)
5528 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5529
5530 if (delta & SerialSignal_CTS)
5531 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5532
5533 if (status)
5534 isr_io_pin(info,status);
5535
5536 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5537 }
5538
5539
5540 /* Register Access Routines -
5541 * All registers are memory mapped
5542 */
5543 #define CALC_REGADDR() \
5544 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5545 if (info->port_num > 1) \
5546 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5547 if ( info->port_num & 1) { \
5548 if (Addr > 0x7f) \
5549 RegAddr += 0x40; /* DMA access */ \
5550 else if (Addr > 0x1f && Addr < 0x60) \
5551 RegAddr += 0x20; /* MSCI access */ \
5552 }
5553
5554
read_reg(SLMP_INFO * info,unsigned char Addr)5555 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5556 {
5557 CALC_REGADDR();
5558 return *RegAddr;
5559 }
write_reg(SLMP_INFO * info,unsigned char Addr,unsigned char Value)5560 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5561 {
5562 CALC_REGADDR();
5563 *RegAddr = Value;
5564 }
5565
read_reg16(SLMP_INFO * info,unsigned char Addr)5566 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5567 {
5568 CALC_REGADDR();
5569 return *((u16 *)RegAddr);
5570 }
5571
write_reg16(SLMP_INFO * info,unsigned char Addr,u16 Value)5572 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5573 {
5574 CALC_REGADDR();
5575 *((u16 *)RegAddr) = Value;
5576 }
5577
read_status_reg(SLMP_INFO * info)5578 static unsigned char read_status_reg(SLMP_INFO * info)
5579 {
5580 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5581 return *RegAddr;
5582 }
5583
write_control_reg(SLMP_INFO * info)5584 static void write_control_reg(SLMP_INFO * info)
5585 {
5586 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5587 *RegAddr = info->port_array[0]->ctrlreg_value;
5588 }
5589
5590
synclinkmp_init_one(struct pci_dev * dev,const struct pci_device_id * ent)5591 static int synclinkmp_init_one (struct pci_dev *dev,
5592 const struct pci_device_id *ent)
5593 {
5594 if (pci_enable_device(dev)) {
5595 printk("error enabling pci device %p\n", dev);
5596 return -EIO;
5597 }
5598 device_init( ++synclinkmp_adapter_count, dev );
5599 return 0;
5600 }
5601
synclinkmp_remove_one(struct pci_dev * dev)5602 static void synclinkmp_remove_one (struct pci_dev *dev)
5603 {
5604 }
5605