1#define PSEUDO_DMA
2
3/*
4 * Trantor T128/T128F/T228 driver
5 *	Note : architecturally, the T100 and T130 are different and won't
6 * 	work
7 *
8 * Copyright 1993, Drew Eckhardt
9 *	Visionary Computing
10 *	(Unix and Linux consulting and custom programming)
11 *	drew@colorado.edu
12 *      +1 (303) 440-4894
13 *
14 * For more information, please consult
15 *
16 * Trantor Systems, Ltd.
17 * T128/T128F/T228 SCSI Host Adapter
18 * Hardware Specifications
19 *
20 * Trantor Systems, Ltd.
21 * 5415 Randall Place
22 * Fremont, CA 94538
23 * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
24 */
25
26/*
27 * The card is detected and initialized in one of several ways :
28 * 1.  Autoprobe (default) - since the board is memory mapped,
29 *     a BIOS signature is scanned for to locate the registers.
30 *     An interrupt is triggered to autoprobe for the interrupt
31 *     line.
32 *
33 * 2.  With command line overrides - t128=address,irq may be
34 *     used on the LILO command line to override the defaults.
35 *
36 * 3.  With the T128_OVERRIDE compile time define.  This is
37 *     specified as an array of address, irq tuples.  Ie, for
38 *     one board at the default 0xcc000 address, IRQ5, I could say
39 *     -DT128_OVERRIDE={{0xcc000, 5}}
40 *
41 *     Note that if the override methods are used, place holders must
42 *     be specified for other boards in the system.
43 *
44 * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
45 * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
46 *
47 * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot
48 * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
49 * cc000   off off
50 * c8000   off on
51 * dc000   on  off
52 * d8000   on  on
53 *
54 *
55 * Interrupts
56 * There is a 12 pin jumper block, jp1, numbered as follows :
57 *   T128 (JP1)  	 T128F (J5)
58 * 2 4 6 8 10 12	11 9  7 5 3 1
59 * 1 3 5 7 9  11	12 10 8 6 4 2
60 *
61 * 3   2-4
62 * 5   1-3
63 * 7   3-5
64 * T128F only
65 * 10 8-10
66 * 12 7-9
67 * 14 10-12
68 * 15 9-11
69 */
70
71#include <linux/signal.h>
72#include <linux/io.h>
73#include <linux/blkdev.h>
74#include <linux/interrupt.h>
75#include <linux/stat.h>
76#include <linux/init.h>
77#include <linux/module.h>
78#include <linux/delay.h>
79
80#include <scsi/scsi_host.h>
81#include "t128.h"
82#define AUTOPROBE_IRQ
83#include "NCR5380.h"
84
85static struct override {
86    unsigned long address;
87    int irq;
88} overrides
89#ifdef T128_OVERRIDE
90    [] __initdata = T128_OVERRIDE;
91#else
92    [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
93        {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
94#endif
95
96#define NO_OVERRIDES ARRAY_SIZE(overrides)
97
98static struct base {
99    unsigned int address;
100    int noauto;
101} bases[] __initdata = {
102    { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
103};
104
105#define NO_BASES ARRAY_SIZE(bases)
106
107static struct signature {
108    const char *string;
109    int offset;
110} signatures[] __initdata = {
111{"TSROM: SCSI BIOS, Version 1.12", 0x36},
112};
113
114#define NO_SIGNATURES ARRAY_SIZE(signatures)
115
116#ifndef MODULE
117/*
118 * Function : t128_setup(char *str, int *ints)
119 *
120 * Purpose : LILO command line initialization of the overrides array,
121 *
122 * Inputs : str - unused, ints - array of integer parameters with ints[0]
123 *	equal to the number of ints.
124 *
125 */
126
127static int __init t128_setup(char *str)
128{
129    static int commandline_current = 0;
130    int i;
131    int ints[10];
132
133    get_options(str, ARRAY_SIZE(ints), ints);
134    if (ints[0] != 2)
135	printk("t128_setup : usage t128=address,irq\n");
136    else
137	if (commandline_current < NO_OVERRIDES) {
138	    overrides[commandline_current].address = ints[1];
139	    overrides[commandline_current].irq = ints[2];
140	    for (i = 0; i < NO_BASES; ++i)
141		if (bases[i].address == ints[1]) {
142		    bases[i].noauto = 1;
143		    break;
144		}
145	    ++commandline_current;
146	}
147    return 1;
148}
149
150__setup("t128=", t128_setup);
151#endif
152
153/*
154 * Function : int t128_detect(struct scsi_host_template * tpnt)
155 *
156 * Purpose : detects and initializes T128,T128F, or T228 controllers
157 *	that were autoprobed, overridden on the LILO command line,
158 *	or specified at compile time.
159 *
160 * Inputs : tpnt - template for this SCSI adapter.
161 *
162 * Returns : 1 if a host adapter was found, 0 if not.
163 *
164 */
165
166static int __init t128_detect(struct scsi_host_template *tpnt)
167{
168    static int current_override = 0, current_base = 0;
169    struct Scsi_Host *instance;
170    unsigned long base;
171    void __iomem *p;
172    int sig, count;
173
174    for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
175	base = 0;
176	p = NULL;
177
178	if (overrides[current_override].address) {
179	    base = overrides[current_override].address;
180	    p = ioremap(bases[current_base].address, 0x2000);
181	    if (!p)
182		base = 0;
183	} else
184	    for (; !base && (current_base < NO_BASES); ++current_base) {
185#if (TDEBUG & TDEBUG_INIT)
186    printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
187#endif
188		if (bases[current_base].noauto)
189			continue;
190		p = ioremap(bases[current_base].address, 0x2000);
191		if (!p)
192			continue;
193		for (sig = 0; sig < NO_SIGNATURES; ++sig)
194		    if (check_signature(p + signatures[sig].offset,
195					signatures[sig].string,
196					strlen(signatures[sig].string))) {
197			base = bases[current_base].address;
198#if (TDEBUG & TDEBUG_INIT)
199			printk("scsi-t128 : detected board.\n");
200#endif
201			goto found;
202		    }
203		iounmap(p);
204	    }
205
206#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
207	printk("scsi-t128 : base = %08x\n", (unsigned int) base);
208#endif
209
210	if (!base)
211	    break;
212
213found:
214	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
215	if(instance == NULL)
216		break;
217
218	instance->base = base;
219	((struct NCR5380_hostdata *)instance->hostdata)->base = p;
220
221	NCR5380_init(instance, 0);
222
223	if (overrides[current_override].irq != IRQ_AUTO)
224	    instance->irq = overrides[current_override].irq;
225	else
226	    instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
227
228	/* Compatibility with documented NCR5380 kernel parameters */
229	if (instance->irq == 255)
230		instance->irq = NO_IRQ;
231
232	if (instance->irq != NO_IRQ)
233	    if (request_irq(instance->irq, t128_intr, 0, "t128",
234			    instance)) {
235		printk("scsi%d : IRQ%d not free, interrupts disabled\n",
236		    instance->host_no, instance->irq);
237		instance->irq = NO_IRQ;
238	    }
239
240	if (instance->irq == NO_IRQ) {
241	    printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
242	    printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
243	}
244
245#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
246	printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
247#endif
248
249	++current_override;
250	++count;
251    }
252    return count;
253}
254
255static int t128_release(struct Scsi_Host *shost)
256{
257	NCR5380_local_declare();
258	NCR5380_setup(shost);
259	if (shost->irq != NO_IRQ)
260		free_irq(shost->irq, shost);
261	NCR5380_exit(shost);
262	if (shost->io_port && shost->n_io_port)
263		release_region(shost->io_port, shost->n_io_port);
264	scsi_unregister(shost);
265	iounmap(base);
266	return 0;
267}
268
269/*
270 * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
271 *
272 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
273 *	the specified device / size.
274 *
275 * Inputs : size = size of device in sectors (512 bytes), dev = block device
276 *	major / minor, ip[] = {heads, sectors, cylinders}
277 *
278 * Returns : always 0 (success), initializes ip
279 *
280 */
281
282/*
283 * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
284 * using hard disks on a trantor should verify that this mapping corresponds
285 * to that used by the BIOS / ASPI driver by running the linux fdisk program
286 * and matching the H_C_S coordinates to what DOS uses.
287 */
288
289static int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
290                          sector_t capacity, int *ip)
291{
292  ip[0] = 64;
293  ip[1] = 32;
294  ip[2] = capacity >> 11;
295  return 0;
296}
297
298/*
299 * Function : int NCR5380_pread (struct Scsi_Host *instance,
300 *	unsigned char *dst, int len)
301 *
302 * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
303 *	dst
304 *
305 * Inputs : dst = destination, len = length in bytes
306 *
307 * Returns : 0 on success, non zero on a failure such as a watchdog
308 * 	timeout.
309 */
310
311static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
312    int len) {
313    NCR5380_local_declare();
314    void __iomem *reg;
315    unsigned char *d = dst;
316    register int i = len;
317
318    NCR5380_setup(instance);
319    reg = base + T_DATA_REG_OFFSET;
320
321#if 0
322    for (; i; --i) {
323	while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
324#else
325    while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
326    for (; i; --i) {
327#endif
328	*d++ = readb(reg);
329    }
330
331    if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
332	unsigned char tmp;
333	void __iomem *foo = base + T_CONTROL_REG_OFFSET;
334	tmp = readb(foo);
335	writeb(tmp | T_CR_CT, foo);
336	writeb(tmp, foo);
337	printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
338	    instance->host_no);
339	return -1;
340    } else
341	return 0;
342}
343
344/*
345 * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
346 *	unsigned char *src, int len)
347 *
348 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
349 *	src
350 *
351 * Inputs : src = source, len = length in bytes
352 *
353 * Returns : 0 on success, non zero on a failure such as a watchdog
354 * 	timeout.
355 */
356
357static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
358    int len) {
359    NCR5380_local_declare();
360    void __iomem *reg;
361    unsigned char *s = src;
362    register int i = len;
363
364    NCR5380_setup(instance);
365    reg = base + T_DATA_REG_OFFSET;
366
367#if 0
368    for (; i; --i) {
369	while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
370#else
371    while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
372    for (; i; --i) {
373#endif
374	writeb(*s++, reg);
375    }
376
377    if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
378	unsigned char tmp;
379	void __iomem *foo = base + T_CONTROL_REG_OFFSET;
380	tmp = readb(foo);
381	writeb(tmp | T_CR_CT, foo);
382	writeb(tmp, foo);
383	printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
384	    instance->host_no);
385	return -1;
386    } else
387	return 0;
388}
389
390MODULE_LICENSE("GPL");
391
392#include "NCR5380.c"
393
394static struct scsi_host_template driver_template = {
395	.name           = "Trantor T128/T128F/T228",
396	.detect         = t128_detect,
397	.release        = t128_release,
398	.proc_name      = "t128",
399	.show_info      = t128_show_info,
400	.write_info     = t128_write_info,
401	.info           = t128_info,
402	.queuecommand   = t128_queue_command,
403	.eh_abort_handler = t128_abort,
404	.eh_bus_reset_handler    = t128_bus_reset,
405	.bios_param     = t128_biosparam,
406	.can_queue      = CAN_QUEUE,
407        .this_id        = 7,
408	.sg_tablesize   = SG_ALL,
409	.cmd_per_lun    = CMD_PER_LUN,
410	.use_clustering = DISABLE_CLUSTERING,
411};
412#include "scsi_module.c"
413