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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / scsi / arm / cumana_2.c
blobfad2109268bb3175321afd6c5b10f5e8d9e44ebb
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/sched.h>
25 #include <linux/proc_fs.h>
26 #include <linux/delay.h>
27 #include <linux/interrupt.h>
28 #include <linux/init.h>
29 #include <linux/dma-mapping.h>
30
31 #include <asm/dma.h>
32 #include <asm/ecard.h>
33 #include <asm/io.h>
34 #include <asm/pgtable.h>
35
36 #include "../scsi.h"
37 #include <scsi/scsi_host.h>
38 #include "fas216.h"
39 #include "scsi.h"
40
41 #include <scsi/scsicam.h>
42
43 #define CUMANASCSI2_STATUS (0x0000)
44 #define STATUS_INT (1 << 0)
45 #define STATUS_DRQ (1 << 1)
46 #define STATUS_LATCHED (1 << 3)
47
48 #define CUMANASCSI2_ALATCH (0x0014)
49 #define ALATCH_ENA_INT (3)
50 #define ALATCH_DIS_INT (2)
51 #define ALATCH_ENA_TERM (5)
52 #define ALATCH_DIS_TERM (4)
53 #define ALATCH_ENA_BIT32 (11)
54 #define ALATCH_DIS_BIT32 (10)
55 #define ALATCH_ENA_DMA (13)
56 #define ALATCH_DIS_DMA (12)
57 #define ALATCH_DMA_OUT (15)
58 #define ALATCH_DMA_IN (14)
59
60 #define CUMANASCSI2_PSEUDODMA (0x0200)
61
62 #define CUMANASCSI2_FAS216_OFFSET (0x0300)
63 #define CUMANASCSI2_FAS216_SHIFT 2
64
65 /*
66 * Version
67 */
68 #define VERSION "1.00 (13/11/2002 2.5.47)"
69
70 /*
71 * Use term=0,1,0,0,0 to turn terminators on/off
72 */
73 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
74
75 #define NR_SG 256
76
77 struct cumanascsi2_info {
78 FAS216_Info info;
79 struct expansion_card *ec;
80 void __iomem *base;
81 unsigned int terms; /* Terminator state */
82 struct scatterlist sg[NR_SG]; /* Scatter DMA list */
83 };
84
85 #define CSTATUS_IRQ (1 << 0)
86 #define CSTATUS_DRQ (1 << 1)
87
88 /* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
89 * Purpose : Enable interrupts on Cumana SCSI 2 card
90 * Params : ec - expansion card structure
91 * : irqnr - interrupt number
92 */
93 static void
94 cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
95 {
96 struct cumanascsi2_info *info = ec->irq_data;
97 writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
98 }
99
100 /* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
101 * Purpose : Disable interrupts on Cumana SCSI 2 card
102 * Params : ec - expansion card structure
103 * : irqnr - interrupt number
104 */
105 static void
106 cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
107 {
108 struct cumanascsi2_info *info = ec->irq_data;
109 writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
110 }
111
112 static const expansioncard_ops_t cumanascsi_2_ops = {
113 .irqenable = cumanascsi_2_irqenable,
114 .irqdisable = cumanascsi_2_irqdisable,
115 };
116
117 /* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
118 * Purpose : Turn the Cumana SCSI 2 terminators on or off
119 * Params : host - card to turn on/off
120 * : on_off - !0 to turn on, 0 to turn off
121 */
122 static void
123 cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
124 {
125 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
126
127 if (on_off) {
128 info->terms = 1;
129 writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
130 } else {
131 info->terms = 0;
132 writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
133 }
134 }
135
136 /* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
137 * Purpose : handle interrupts from Cumana SCSI 2 card
138 * Params : irq - interrupt number
139 * dev_id - user-defined (Scsi_Host structure)
140 * regs - processor registers at interrupt
141 */
142 static irqreturn_t
143 cumanascsi_2_intr(int irq, void *dev_id, struct pt_regs *regs)
144 {
145 struct cumanascsi2_info *info = dev_id;
146
147 return fas216_intr(&info->info);
148 }
149
150 /* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
151 * Purpose : initialises DMA/PIO
152 * Params : host - host
153 * SCpnt - command
154 * direction - DMA on to/off of card
155 * min_type - minimum DMA support that we must have for this transfer
156 * Returns : type of transfer to be performed
157 */
158 static fasdmatype_t
159 cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
160 fasdmadir_t direction, fasdmatype_t min_type)
161 {
162 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
163 struct device *dev = scsi_get_device(host);
164 int dmach = info->info.scsi.dma;
165
166 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
167
168 if (dmach != NO_DMA &&
169 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
170 int bufs, map_dir, dma_dir, alatch_dir;
171
172 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
173
174 if (direction == DMA_OUT)
175 map_dir = DMA_TO_DEVICE,
176 dma_dir = DMA_MODE_WRITE,
177 alatch_dir = ALATCH_DMA_OUT;
178 else
179 map_dir = DMA_FROM_DEVICE,
180 dma_dir = DMA_MODE_READ,
181 alatch_dir = ALATCH_DMA_IN;
182
183 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
184
185 disable_dma(dmach);
186 set_dma_sg(dmach, info->sg, bufs + 1);
187 writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
188 set_dma_mode(dmach, dma_dir);
189 enable_dma(dmach);
190 writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
191 writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
192 return fasdma_real_all;
193 }
194
195 /*
196 * If we're not doing DMA,
197 * we'll do pseudo DMA
198 */
199 return fasdma_pio;
200 }
201
202 /*
203 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
204 * Purpose : handles pseudo DMA
205 * Params : host - host
206 * SCpnt - command
207 * direction - DMA on to/off of card
208 * transfer - minimum number of bytes we expect to transfer
209 */
210 static void
211 cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
212 fasdmadir_t direction, int transfer)
213 {
214 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
215 unsigned int length;
216 unsigned char *addr;
217
218 length = SCp->this_residual;
219 addr = SCp->ptr;
220
221 if (direction == DMA_OUT)
222 #if 0
223 while (length > 1) {
224 unsigned long word;
225 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
226
227 if (status & STATUS_INT)
228 goto end;
229
230 if (!(status & STATUS_DRQ))
231 continue;
232
233 word = *addr | *(addr + 1) << 8;
234 writew(word, info->base + CUMANASCSI2_PSEUDODMA);
235 addr += 2;
236 length -= 2;
237 }
238 #else
239 printk ("PSEUDO_OUT???\n");
240 #endif
241 else {
242 if (transfer && (transfer & 255)) {
243 while (length >= 256) {
244 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
245
246 if (status & STATUS_INT)
247 return;
248
249 if (!(status & STATUS_DRQ))
250 continue;
251
252 readsw(info->base + CUMANASCSI2_PSEUDODMA,
253 addr, 256 >> 1);
254 addr += 256;
255 length -= 256;
256 }
257 }
258
259 while (length > 0) {
260 unsigned long word;
261 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
262
263 if (status & STATUS_INT)
264 return;
265
266 if (!(status & STATUS_DRQ))
267 continue;
268
269 word = readw(info->base + CUMANASCSI2_PSEUDODMA);
270 *addr++ = word;
271 if (--length > 0) {
272 *addr++ = word >> 8;
273 length --;
274 }
275 }
276 }
277 }
278
279 /* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
280 * Purpose : stops DMA/PIO
281 * Params : host - host
282 * SCpnt - command
283 */
284 static void
285 cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
286 {
287 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
288 if (info->info.scsi.dma != NO_DMA) {
289 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
290 disable_dma(info->info.scsi.dma);
291 }
292 }
293
294 /* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
295 * Purpose : returns a descriptive string about this interface,
296 * Params : host - driver host structure to return info for.
297 * Returns : pointer to a static buffer containing null terminated string.
298 */
299 const char *cumanascsi_2_info(struct Scsi_Host *host)
300 {
301 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
302 static char string[150];
303
304 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
305 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
306 VERSION, info->terms ? "n" : "ff");
307
308 return string;
309 }
310
311 /* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
312 * Purpose : Set a driver specific function
313 * Params : host - host to setup
314 * : buffer - buffer containing string describing operation
315 * : length - length of string
316 * Returns : -EINVAL, or 0
317 */
318 static int
319 cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
320 {
321 int ret = length;
322
323 if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) {
324 buffer += 11;
325 length -= 11;
326
327 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
328 if (buffer[5] == '1')
329 cumanascsi_2_terminator_ctl(host, 1);
330 else if (buffer[5] == '0')
331 cumanascsi_2_terminator_ctl(host, 0);
332 else
333 ret = -EINVAL;
334 } else
335 ret = -EINVAL;
336 } else
337 ret = -EINVAL;
338
339 return ret;
340 }
341
342 /* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
343 * int length, int host_no, int inout)
344 * Purpose : Return information about the driver to a user process accessing
345 * the /proc filesystem.
346 * Params : buffer - a buffer to write information to
347 * start - a pointer into this buffer set by this routine to the start
348 * of the required information.
349 * offset - offset into information that we have read upto.
350 * length - length of buffer
351 * host_no - host number to return information for
352 * inout - 0 for reading, 1 for writing.
353 * Returns : length of data written to buffer.
354 */
355 int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset,
356 int length, int inout)
357 {
358 struct cumanascsi2_info *info;
359 char *p = buffer;
360 int pos;
361
362 if (inout == 1)
363 return cumanascsi_2_set_proc_info(host, buffer, length);
364
365 info = (struct cumanascsi2_info *)host->hostdata;
366
367 p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION);
368 p += fas216_print_host(&info->info, p);
369 p += sprintf(p, "Term : o%s\n",
370 info->terms ? "n" : "ff");
371
372 p += fas216_print_stats(&info->info, p);
373 p += fas216_print_devices(&info->info, p);
374
375 *start = buffer + offset;
376 pos = p - buffer - offset;
377 if (pos > length)
378 pos = length;
379
380 return pos;
381 }
382
383 static struct scsi_host_template cumanascsi2_template = {
384 .module = THIS_MODULE,
385 .proc_info = cumanascsi_2_proc_info,
386 .name = "Cumana SCSI II",
387 .info = cumanascsi_2_info,
388 .queuecommand = fas216_queue_command,
389 .eh_host_reset_handler = fas216_eh_host_reset,
390 .eh_bus_reset_handler = fas216_eh_bus_reset,
391 .eh_device_reset_handler = fas216_eh_device_reset,
392 .eh_abort_handler = fas216_eh_abort,
393 .can_queue = 1,
394 .this_id = 7,
395 .sg_tablesize = SG_ALL,
396 .cmd_per_lun = 1,
397 .use_clustering = DISABLE_CLUSTERING,
398 .proc_name = "cumanascsi2",
399 };
400
401 static int __devinit
402 cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
403 {
404 struct Scsi_Host *host;
405 struct cumanascsi2_info *info;
406 unsigned long resbase, reslen;
407 void __iomem *base;
408 int ret;
409
410 ret = ecard_request_resources(ec);
411 if (ret)
412 goto out;
413
414 resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
415 reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
416 base = ioremap(resbase, reslen);
417 if (!base) {
418 ret = -ENOMEM;
419 goto out_region;
420 }
421
422 host = scsi_host_alloc(&cumanascsi2_template,
423 sizeof(struct cumanascsi2_info));
424 if (!host) {
425 ret = -ENOMEM;
426 goto out_unmap;
427 }
428
429 ecard_set_drvdata(ec, host);
430
431 info = (struct cumanascsi2_info *)host->hostdata;
432 info->ec = ec;
433 info->base = base;
434
435 cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
436
437 info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET;
438 info->info.scsi.io_shift = CUMANASCSI2_FAS216_SHIFT;
439 info->info.scsi.irq = ec->irq;
440 info->info.scsi.dma = ec->dma;
441 info->info.ifcfg.clockrate = 40; /* MHz */
442 info->info.ifcfg.select_timeout = 255;
443 info->info.ifcfg.asyncperiod = 200; /* ns */
444 info->info.ifcfg.sync_max_depth = 7;
445 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
446 info->info.ifcfg.disconnect_ok = 1;
447 info->info.ifcfg.wide_max_size = 0;
448 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
449 info->info.dma.setup = cumanascsi_2_dma_setup;
450 info->info.dma.pseudo = cumanascsi_2_dma_pseudo;
451 info->info.dma.stop = cumanascsi_2_dma_stop;
452
453 ec->irqaddr = info->base + CUMANASCSI2_STATUS;
454 ec->irqmask = STATUS_INT;
455 ec->irq_data = info;
456 ec->ops = &cumanascsi_2_ops;
457
458 ret = fas216_init(host);
459 if (ret)
460 goto out_free;
461
462 ret = request_irq(ec->irq, cumanascsi_2_intr,
463 SA_INTERRUPT, "cumanascsi2", info);
464 if (ret) {
465 printk("scsi%d: IRQ%d not free: %d\n",
466 host->host_no, ec->irq, ret);
467 goto out_release;
468 }
469
470 if (info->info.scsi.dma != NO_DMA) {
471 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
472 printk("scsi%d: DMA%d not free, using PIO\n",
473 host->host_no, info->info.scsi.dma);
474 info->info.scsi.dma = NO_DMA;
475 } else {
476 set_dma_speed(info->info.scsi.dma, 180);
477 info->info.ifcfg.capabilities |= FASCAP_DMA;
478 }
479 }
480
481 ret = fas216_add(host, &ec->dev);
482 if (ret == 0)
483 goto out;
484
485 if (info->info.scsi.dma != NO_DMA)
486 free_dma(info->info.scsi.dma);
487 free_irq(ec->irq, host);
488
489 out_release:
490 fas216_release(host);
491
492 out_free:
493 scsi_host_put(host);
494
495 out_unmap:
496 iounmap(base);
497
498 out_region:
499 ecard_release_resources(ec);
500
501 out:
502 return ret;
503 }
504
505 static void __devexit cumanascsi2_remove(struct expansion_card *ec)
506 {
507 struct Scsi_Host *host = ecard_get_drvdata(ec);
508 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
509
510 ecard_set_drvdata(ec, NULL);
511 fas216_remove(host);
512
513 if (info->info.scsi.dma != NO_DMA)
514 free_dma(info->info.scsi.dma);
515 free_irq(ec->irq, info);
516
517 iounmap(info->base);
518
519 fas216_release(host);
520 scsi_host_put(host);
521 ecard_release_resources(ec);
522 }
523
524 static const struct ecard_id cumanascsi2_cids[] = {
525 { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
526 { 0xffff, 0xffff },
527 };
528
529 static struct ecard_driver cumanascsi2_driver = {
530 .probe = cumanascsi2_probe,
531 .remove = __devexit_p(cumanascsi2_remove),
532 .id_table = cumanascsi2_cids,
533 .drv = {
534 .name = "cumanascsi2",
535 },
536 };
537
538 static int __init cumanascsi2_init(void)
539 {
540 return ecard_register_driver(&cumanascsi2_driver);
541 }
542
543 static void __exit cumanascsi2_exit(void)
544 {
545 ecard_remove_driver(&cumanascsi2_driver);
546 }
547
548 module_init(cumanascsi2_init);
549 module_exit(cumanascsi2_exit);
550
551 MODULE_AUTHOR("Russell King");
552 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
553 module_param_array(term, int, NULL, 0);
554 MODULE_PARM_DESC(term, "SCSI bus termination");
555 MODULE_LICENSE("GPL");
Linux with added FPC-III support