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This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / drivers / scsi / arm / cumana_2.c
blob547987b86384e9fa693e43c0e5b27f23f52ae8b1
1 /*
2 * linux/drivers/acorn/scsi/cumana_2.c
3 *
4 * Copyright (C) 1997-2005 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Changelog:
11 * 30-08-1997 RMK 0.0.0 Created, READONLY version.
12 * 22-01-1998 RMK 0.0.1 Updated to 2.1.80.
13 * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.
14 * 02-05-1998 RMK 0.0.2 Updated & added DMA support.
15 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
16 * 18-08-1998 RMK 0.0.3 Fixed synchronous transfer depth.
17 * 02-04-2000 RMK 0.0.4 Updated for new error handling code.
18 */
19 #include <linux/module.h>
20 #include <linux/blkdev.h>
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/ioport.h>
24 #include <linux/proc_fs.h>
25 #include <linux/delay.h>
26 #include <linux/interrupt.h>
27 #include <linux/init.h>
28 #include <linux/dma-mapping.h>
29
30 #include <asm/dma.h>
31 #include <asm/ecard.h>
32 #include <asm/io.h>
33 #include <asm/pgtable.h>
34
35 #include "../scsi.h"
36 #include <scsi/scsi_host.h>
37 #include "fas216.h"
38 #include "scsi.h"
39
40 #include <scsi/scsicam.h>
41
42 #define CUMANASCSI2_STATUS (0x0000)
43 #define STATUS_INT (1 << 0)
44 #define STATUS_DRQ (1 << 1)
45 #define STATUS_LATCHED (1 << 3)
46
47 #define CUMANASCSI2_ALATCH (0x0014)
48 #define ALATCH_ENA_INT (3)
49 #define ALATCH_DIS_INT (2)
50 #define ALATCH_ENA_TERM (5)
51 #define ALATCH_DIS_TERM (4)
52 #define ALATCH_ENA_BIT32 (11)
53 #define ALATCH_DIS_BIT32 (10)
54 #define ALATCH_ENA_DMA (13)
55 #define ALATCH_DIS_DMA (12)
56 #define ALATCH_DMA_OUT (15)
57 #define ALATCH_DMA_IN (14)
58
59 #define CUMANASCSI2_PSEUDODMA (0x0200)
60
61 #define CUMANASCSI2_FAS216_OFFSET (0x0300)
62 #define CUMANASCSI2_FAS216_SHIFT 2
63
64 /*
65 * Version
66 */
67 #define VERSION "1.00 (13/11/2002 2.5.47)"
68
69 /*
70 * Use term=0,1,0,0,0 to turn terminators on/off
71 */
72 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
73
74 #define NR_SG 256
75
76 struct cumanascsi2_info {
77 FAS216_Info info;
78 struct expansion_card *ec;
79 void __iomem *base;
80 unsigned int terms; /* Terminator state */
81 struct scatterlist sg[NR_SG]; /* Scatter DMA list */
82 };
83
84 #define CSTATUS_IRQ (1 << 0)
85 #define CSTATUS_DRQ (1 << 1)
86
87 /* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
88 * Purpose : Enable interrupts on Cumana SCSI 2 card
89 * Params : ec - expansion card structure
90 * : irqnr - interrupt number
91 */
92 static void
93 cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
94 {
95 struct cumanascsi2_info *info = ec->irq_data;
96 writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
97 }
98
99 /* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
100 * Purpose : Disable interrupts on Cumana SCSI 2 card
101 * Params : ec - expansion card structure
102 * : irqnr - interrupt number
103 */
104 static void
105 cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
106 {
107 struct cumanascsi2_info *info = ec->irq_data;
108 writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
109 }
110
111 static const expansioncard_ops_t cumanascsi_2_ops = {
112 .irqenable = cumanascsi_2_irqenable,
113 .irqdisable = cumanascsi_2_irqdisable,
114 };
115
116 /* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
117 * Purpose : Turn the Cumana SCSI 2 terminators on or off
118 * Params : host - card to turn on/off
119 * : on_off - !0 to turn on, 0 to turn off
120 */
121 static void
122 cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
123 {
124 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
125
126 if (on_off) {
127 info->terms = 1;
128 writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
129 } else {
130 info->terms = 0;
131 writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
132 }
133 }
134
135 /* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
136 * Purpose : handle interrupts from Cumana SCSI 2 card
137 * Params : irq - interrupt number
138 * dev_id - user-defined (Scsi_Host structure)
139 */
140 static irqreturn_t
141 cumanascsi_2_intr(int irq, void *dev_id)
142 {
143 struct cumanascsi2_info *info = dev_id;
144
145 return fas216_intr(&info->info);
146 }
147
148 /* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
149 * Purpose : initialises DMA/PIO
150 * Params : host - host
151 * SCpnt - command
152 * direction - DMA on to/off of card
153 * min_type - minimum DMA support that we must have for this transfer
154 * Returns : type of transfer to be performed
155 */
156 static fasdmatype_t
157 cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
158 fasdmadir_t direction, fasdmatype_t min_type)
159 {
160 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
161 struct device *dev = scsi_get_device(host);
162 int dmach = info->info.scsi.dma;
163
164 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
165
166 if (dmach != NO_DMA &&
167 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
168 int bufs, map_dir, dma_dir, alatch_dir;
169
170 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
171
172 if (direction == DMA_OUT)
173 map_dir = DMA_TO_DEVICE,
174 dma_dir = DMA_MODE_WRITE,
175 alatch_dir = ALATCH_DMA_OUT;
176 else
177 map_dir = DMA_FROM_DEVICE,
178 dma_dir = DMA_MODE_READ,
179 alatch_dir = ALATCH_DMA_IN;
180
181 dma_map_sg(dev, info->sg, bufs, map_dir);
182
183 disable_dma(dmach);
184 set_dma_sg(dmach, info->sg, bufs);
185 writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
186 set_dma_mode(dmach, dma_dir);
187 enable_dma(dmach);
188 writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
189 writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
190 return fasdma_real_all;
191 }
192
193 /*
194 * If we're not doing DMA,
195 * we'll do pseudo DMA
196 */
197 return fasdma_pio;
198 }
199
200 /*
201 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
202 * Purpose : handles pseudo DMA
203 * Params : host - host
204 * SCpnt - command
205 * direction - DMA on to/off of card
206 * transfer - minimum number of bytes we expect to transfer
207 */
208 static void
209 cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
210 fasdmadir_t direction, int transfer)
211 {
212 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
213 unsigned int length;
214 unsigned char *addr;
215
216 length = SCp->this_residual;
217 addr = SCp->ptr;
218
219 if (direction == DMA_OUT)
220 #if 0
221 while (length > 1) {
222 unsigned long word;
223 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
224
225 if (status & STATUS_INT)
226 goto end;
227
228 if (!(status & STATUS_DRQ))
229 continue;
230
231 word = *addr | *(addr + 1) << 8;
232 writew(word, info->base + CUMANASCSI2_PSEUDODMA);
233 addr += 2;
234 length -= 2;
235 }
236 #else
237 printk ("PSEUDO_OUT???\n");
238 #endif
239 else {
240 if (transfer && (transfer & 255)) {
241 while (length >= 256) {
242 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
243
244 if (status & STATUS_INT)
245 return;
246
247 if (!(status & STATUS_DRQ))
248 continue;
249
250 readsw(info->base + CUMANASCSI2_PSEUDODMA,
251 addr, 256 >> 1);
252 addr += 256;
253 length -= 256;
254 }
255 }
256
257 while (length > 0) {
258 unsigned long word;
259 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
260
261 if (status & STATUS_INT)
262 return;
263
264 if (!(status & STATUS_DRQ))
265 continue;
266
267 word = readw(info->base + CUMANASCSI2_PSEUDODMA);
268 *addr++ = word;
269 if (--length > 0) {
270 *addr++ = word >> 8;
271 length --;
272 }
273 }
274 }
275 }
276
277 /* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
278 * Purpose : stops DMA/PIO
279 * Params : host - host
280 * SCpnt - command
281 */
282 static void
283 cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
284 {
285 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
286 if (info->info.scsi.dma != NO_DMA) {
287 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
288 disable_dma(info->info.scsi.dma);
289 }
290 }
291
292 /* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
293 * Purpose : returns a descriptive string about this interface,
294 * Params : host - driver host structure to return info for.
295 * Returns : pointer to a static buffer containing null terminated string.
296 */
297 const char *cumanascsi_2_info(struct Scsi_Host *host)
298 {
299 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
300 static char string[150];
301
302 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
303 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
304 VERSION, info->terms ? "n" : "ff");
305
306 return string;
307 }
308
309 /* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
310 * Purpose : Set a driver specific function
311 * Params : host - host to setup
312 * : buffer - buffer containing string describing operation
313 * : length - length of string
314 * Returns : -EINVAL, or 0
315 */
316 static int
317 cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
318 {
319 int ret = length;
320
321 if (length >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) {
322 buffer += 11;
323 length -= 11;
324
325 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
326 if (buffer[5] == '1')
327 cumanascsi_2_terminator_ctl(host, 1);
328 else if (buffer[5] == '0')
329 cumanascsi_2_terminator_ctl(host, 0);
330 else
331 ret = -EINVAL;
332 } else
333 ret = -EINVAL;
334 } else
335 ret = -EINVAL;
336
337 return ret;
338 }
339
340 /* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
341 * int length, int host_no, int inout)
342 * Purpose : Return information about the driver to a user process accessing
343 * the /proc filesystem.
344 * Params : buffer - a buffer to write information to
345 * start - a pointer into this buffer set by this routine to the start
346 * of the required information.
347 * offset - offset into information that we have read up to.
348 * length - length of buffer
349 * host_no - host number to return information for
350 * inout - 0 for reading, 1 for writing.
351 * Returns : length of data written to buffer.
352 */
353 int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset,
354 int length, int inout)
355 {
356 struct cumanascsi2_info *info;
357 char *p = buffer;
358 int pos;
359
360 if (inout == 1)
361 return cumanascsi_2_set_proc_info(host, buffer, length);
362
363 info = (struct cumanascsi2_info *)host->hostdata;
364
365 p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION);
366 p += fas216_print_host(&info->info, p);
367 p += sprintf(p, "Term : o%s\n",
368 info->terms ? "n" : "ff");
369
370 p += fas216_print_stats(&info->info, p);
371 p += fas216_print_devices(&info->info, p);
372
373 *start = buffer + offset;
374 pos = p - buffer - offset;
375 if (pos > length)
376 pos = length;
377
378 return pos;
379 }
380
381 static struct scsi_host_template cumanascsi2_template = {
382 .module = THIS_MODULE,
383 .proc_info = cumanascsi_2_proc_info,
384 .name = "Cumana SCSI II",
385 .info = cumanascsi_2_info,
386 .queuecommand = fas216_queue_command,
387 .eh_host_reset_handler = fas216_eh_host_reset,
388 .eh_bus_reset_handler = fas216_eh_bus_reset,
389 .eh_device_reset_handler = fas216_eh_device_reset,
390 .eh_abort_handler = fas216_eh_abort,
391 .can_queue = 1,
392 .this_id = 7,
393 .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
394 .dma_boundary = IOMD_DMA_BOUNDARY,
395 .cmd_per_lun = 1,
396 .use_clustering = DISABLE_CLUSTERING,
397 .proc_name = "cumanascsi2",
398 };
399
400 static int __devinit
401 cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
402 {
403 struct Scsi_Host *host;
404 struct cumanascsi2_info *info;
405 void __iomem *base;
406 int ret;
407
408 ret = ecard_request_resources(ec);
409 if (ret)
410 goto out;
411
412 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
413 if (!base) {
414 ret = -ENOMEM;
415 goto out_region;
416 }
417
418 host = scsi_host_alloc(&cumanascsi2_template,
419 sizeof(struct cumanascsi2_info));
420 if (!host) {
421 ret = -ENOMEM;
422 goto out_region;
423 }
424
425 ecard_set_drvdata(ec, host);
426
427 info = (struct cumanascsi2_info *)host->hostdata;
428 info->ec = ec;
429 info->base = base;
430
431 cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
432
433 info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET;
434 info->info.scsi.io_shift = CUMANASCSI2_FAS216_SHIFT;
435 info->info.scsi.irq = ec->irq;
436 info->info.scsi.dma = ec->dma;
437 info->info.ifcfg.clockrate = 40; /* MHz */
438 info->info.ifcfg.select_timeout = 255;
439 info->info.ifcfg.asyncperiod = 200; /* ns */
440 info->info.ifcfg.sync_max_depth = 7;
441 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
442 info->info.ifcfg.disconnect_ok = 1;
443 info->info.ifcfg.wide_max_size = 0;
444 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
445 info->info.dma.setup = cumanascsi_2_dma_setup;
446 info->info.dma.pseudo = cumanascsi_2_dma_pseudo;
447 info->info.dma.stop = cumanascsi_2_dma_stop;
448
449 ec->irqaddr = info->base + CUMANASCSI2_STATUS;
450 ec->irqmask = STATUS_INT;
451
452 ecard_setirq(ec, &cumanascsi_2_ops, info);
453
454 ret = fas216_init(host);
455 if (ret)
456 goto out_free;
457
458 ret = request_irq(ec->irq, cumanascsi_2_intr,
459 IRQF_DISABLED, "cumanascsi2", info);
460 if (ret) {
461 printk("scsi%d: IRQ%d not free: %d\n",
462 host->host_no, ec->irq, ret);
463 goto out_release;
464 }
465
466 if (info->info.scsi.dma != NO_DMA) {
467 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
468 printk("scsi%d: DMA%d not free, using PIO\n",
469 host->host_no, info->info.scsi.dma);
470 info->info.scsi.dma = NO_DMA;
471 } else {
472 set_dma_speed(info->info.scsi.dma, 180);
473 info->info.ifcfg.capabilities |= FASCAP_DMA;
474 }
475 }
476
477 ret = fas216_add(host, &ec->dev);
478 if (ret == 0)
479 goto out;
480
481 if (info->info.scsi.dma != NO_DMA)
482 free_dma(info->info.scsi.dma);
483 free_irq(ec->irq, host);
484
485 out_release:
486 fas216_release(host);
487
488 out_free:
489 scsi_host_put(host);
490
491 out_region:
492 ecard_release_resources(ec);
493
494 out:
495 return ret;
496 }
497
498 static void __devexit cumanascsi2_remove(struct expansion_card *ec)
499 {
500 struct Scsi_Host *host = ecard_get_drvdata(ec);
501 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
502
503 ecard_set_drvdata(ec, NULL);
504 fas216_remove(host);
505
506 if (info->info.scsi.dma != NO_DMA)
507 free_dma(info->info.scsi.dma);
508 free_irq(ec->irq, info);
509
510 fas216_release(host);
511 scsi_host_put(host);
512 ecard_release_resources(ec);
513 }
514
515 static const struct ecard_id cumanascsi2_cids[] = {
516 { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
517 { 0xffff, 0xffff },
518 };
519
520 static struct ecard_driver cumanascsi2_driver = {
521 .probe = cumanascsi2_probe,
522 .remove = __devexit_p(cumanascsi2_remove),
523 .id_table = cumanascsi2_cids,
524 .drv = {
525 .name = "cumanascsi2",
526 },
527 };
528
529 static int __init cumanascsi2_init(void)
530 {
531 return ecard_register_driver(&cumanascsi2_driver);
532 }
533
534 static void __exit cumanascsi2_exit(void)
535 {
536 ecard_remove_driver(&cumanascsi2_driver);
537 }
538
539 module_init(cumanascsi2_init);
540 module_exit(cumanascsi2_exit);
541
542 MODULE_AUTHOR("Russell King");
543 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
544 module_param_array(term, int, NULL, 0);
545 MODULE_PARM_DESC(term, "SCSI bus termination");
546 MODULE_LICENSE("GPL");
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