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