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Merge master.kernel.org:/pub/scm/linux/kernel/git/perex/alsa
[wrt350n-kernel.git] / drivers / scsi / arm / eesox.c
blobdcbb4b2b3fe054ca4b70968b870c295c56ccfe17
1 /*
2 * linux/drivers/acorn/scsi/eesox.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 * This driver is based on experimentation. Hence, it may have made
11 * assumptions about the particular card that I have available, and
12 * may not be reliable!
13 *
14 * Changelog:
15 * 01-10-1997 RMK Created, READONLY version
16 * 15-02-1998 RMK READ/WRITE version
17 * added DMA support and hardware definitions
18 * 14-03-1998 RMK Updated DMA support
19 * Added terminator control
20 * 15-04-1998 RMK Only do PIO if FAS216 will allow it.
21 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
22 * 02-04-2000 RMK 0.0.3 Fixed NO_IRQ/NO_DMA problem, updated for new
23 * error handling code.
24 */
25 #include <linux/module.h>
26 #include <linux/blkdev.h>
27 #include <linux/kernel.h>
28 #include <linux/string.h>
29 #include <linux/ioport.h>
30 #include <linux/sched.h>
31 #include <linux/proc_fs.h>
32 #include <linux/delay.h>
33 #include <linux/interrupt.h>
34 #include <linux/init.h>
35 #include <linux/dma-mapping.h>
36
37 #include <asm/io.h>
38 #include <asm/dma.h>
39 #include <asm/ecard.h>
40 #include <asm/pgtable.h>
41
42 #include "../scsi.h"
43 #include <scsi/scsi_host.h>
44 #include "fas216.h"
45 #include "scsi.h"
46
47 #include <scsi/scsicam.h>
48
49 #define EESOX_FAS216_OFFSET 0x3000
50 #define EESOX_FAS216_SHIFT 5
51
52 #define EESOX_DMASTAT 0x2800
53 #define EESOX_STAT_INTR 0x01
54 #define EESOX_STAT_DMA 0x02
55
56 #define EESOX_CONTROL 0x2800
57 #define EESOX_INTR_ENABLE 0x04
58 #define EESOX_TERM_ENABLE 0x02
59 #define EESOX_RESET 0x01
60
61 #define EESOX_DMADATA 0x3800
62
63 #define VERSION "1.10 (17/01/2003 2.5.59)"
64
65 /*
66 * Use term=0,1,0,0,0 to turn terminators on/off
67 */
68 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
69
70 #define NR_SG 256
71
72 struct eesoxscsi_info {
73 FAS216_Info info;
74 struct expansion_card *ec;
75 void __iomem *base;
76 void __iomem *ctl_port;
77 unsigned int control;
78 struct scatterlist sg[NR_SG]; /* Scatter DMA list */
79 };
80
81 /* Prototype: void eesoxscsi_irqenable(ec, irqnr)
82 * Purpose : Enable interrupts on EESOX SCSI card
83 * Params : ec - expansion card structure
84 * : irqnr - interrupt number
85 */
86 static void
87 eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
88 {
89 struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
90
91 info->control |= EESOX_INTR_ENABLE;
92
93 writeb(info->control, info->ctl_port);
94 }
95
96 /* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
97 * Purpose : Disable interrupts on EESOX SCSI card
98 * Params : ec - expansion card structure
99 * : irqnr - interrupt number
100 */
101 static void
102 eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
103 {
104 struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
105
106 info->control &= ~EESOX_INTR_ENABLE;
107
108 writeb(info->control, info->ctl_port);
109 }
110
111 static const expansioncard_ops_t eesoxscsi_ops = {
112 .irqenable = eesoxscsi_irqenable,
113 .irqdisable = eesoxscsi_irqdisable,
114 };
115
116 /* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
117 * Purpose : Turn the EESOX SCSI 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 eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
123 {
124 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
125 unsigned long flags;
126
127 spin_lock_irqsave(host->host_lock, flags);
128 if (on_off)
129 info->control |= EESOX_TERM_ENABLE;
130 else
131 info->control &= ~EESOX_TERM_ENABLE;
132
133 writeb(info->control, info->ctl_port);
134 spin_unlock_irqrestore(host->host_lock, flags);
135 }
136
137 /* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
138 * Purpose : handle interrupts from EESOX SCSI card
139 * Params : irq - interrupt number
140 * dev_id - user-defined (Scsi_Host structure)
141 * regs - processor registers at interrupt
142 */
143 static irqreturn_t
144 eesoxscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
145 {
146 struct eesoxscsi_info *info = dev_id;
147
148 return fas216_intr(&info->info);
149 }
150
151 /* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
152 * Purpose : initialises DMA/PIO
153 * Params : host - host
154 * SCpnt - command
155 * direction - DMA on to/off of card
156 * min_type - minimum DMA support that we must have for this transfer
157 * Returns : type of transfer to be performed
158 */
159 static fasdmatype_t
160 eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
161 fasdmadir_t direction, fasdmatype_t min_type)
162 {
163 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
164 struct device *dev = scsi_get_device(host);
165 int dmach = info->info.scsi.dma;
166
167 if (dmach != NO_DMA &&
168 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
169 int bufs, map_dir, dma_dir;
170
171 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
172
173 if (direction == DMA_OUT)
174 map_dir = DMA_TO_DEVICE,
175 dma_dir = DMA_MODE_WRITE;
176 else
177 map_dir = DMA_FROM_DEVICE,
178 dma_dir = DMA_MODE_READ;
179
180 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
181
182 disable_dma(dmach);
183 set_dma_sg(dmach, info->sg, bufs + 1);
184 set_dma_mode(dmach, dma_dir);
185 enable_dma(dmach);
186 return fasdma_real_all;
187 }
188 /*
189 * We don't do DMA, we only do slow PIO
190 *
191 * Some day, we will do Pseudo DMA
192 */
193 return fasdma_pseudo;
194 }
195
196 static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
197 {
198 const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
199 const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
200 const void __iomem *reg_dmadata = base + EESOX_DMADATA;
201 const register unsigned long mask = 0xffff;
202
203 do {
204 unsigned int status;
205
206 /*
207 * Interrupt request?
208 */
209 status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
210 if (status & STAT_INT)
211 break;
212
213 /*
214 * DMA request active?
215 */
216 status = readb(reg_dmastat);
217 if (!(status & EESOX_STAT_DMA))
218 continue;
219
220 /*
221 * Get number of bytes in FIFO
222 */
223 status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
224 if (status > 16)
225 status = 16;
226 if (status > length)
227 status = length;
228
229 /*
230 * Align buffer.
231 */
232 if (((u32)buf) & 2 && status >= 2) {
233 *(u16 *)buf = readl(reg_dmadata);
234 buf += 2;
235 status -= 2;
236 length -= 2;
237 }
238
239 if (status >= 8) {
240 unsigned long l1, l2;
241
242 l1 = readl(reg_dmadata) & mask;
243 l1 |= readl(reg_dmadata) << 16;
244 l2 = readl(reg_dmadata) & mask;
245 l2 |= readl(reg_dmadata) << 16;
246 *(u32 *)buf = l1;
247 buf += 4;
248 *(u32 *)buf = l2;
249 buf += 4;
250 length -= 8;
251 continue;
252 }
253
254 if (status >= 4) {
255 unsigned long l1;
256
257 l1 = readl(reg_dmadata) & mask;
258 l1 |= readl(reg_dmadata) << 16;
259
260 *(u32 *)buf = l1;
261 buf += 4;
262 length -= 4;
263 continue;
264 }
265
266 if (status >= 2) {
267 *(u16 *)buf = readl(reg_dmadata);
268 buf += 2;
269 length -= 2;
270 }
271 } while (length);
272 }
273
274 static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
275 {
276 const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
277 const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
278 const void __iomem *reg_dmadata = base + EESOX_DMADATA;
279
280 do {
281 unsigned int status;
282
283 /*
284 * Interrupt request?
285 */
286 status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
287 if (status & STAT_INT)
288 break;
289
290 /*
291 * DMA request active?
292 */
293 status = readb(reg_dmastat);
294 if (!(status & EESOX_STAT_DMA))
295 continue;
296
297 /*
298 * Get number of bytes in FIFO
299 */
300 status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
301 if (status > 16)
302 status = 16;
303 status = 16 - status;
304 if (status > length)
305 status = length;
306 status &= ~1;
307
308 /*
309 * Align buffer.
310 */
311 if (((u32)buf) & 2 && status >= 2) {
312 writel(*(u16 *)buf << 16, reg_dmadata);
313 buf += 2;
314 status -= 2;
315 length -= 2;
316 }
317
318 if (status >= 8) {
319 unsigned long l1, l2;
320
321 l1 = *(u32 *)buf;
322 buf += 4;
323 l2 = *(u32 *)buf;
324 buf += 4;
325
326 writel(l1 << 16, reg_dmadata);
327 writel(l1, reg_dmadata);
328 writel(l2 << 16, reg_dmadata);
329 writel(l2, reg_dmadata);
330 length -= 8;
331 continue;
332 }
333
334 if (status >= 4) {
335 unsigned long l1;
336
337 l1 = *(u32 *)buf;
338 buf += 4;
339
340 writel(l1 << 16, reg_dmadata);
341 writel(l1, reg_dmadata);
342 length -= 4;
343 continue;
344 }
345
346 if (status >= 2) {
347 writel(*(u16 *)buf << 16, reg_dmadata);
348 buf += 2;
349 length -= 2;
350 }
351 } while (length);
352 }
353
354 static void
355 eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
356 fasdmadir_t dir, int transfer_size)
357 {
358 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
359 if (dir == DMA_IN) {
360 eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
361 } else {
362 eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
363 }
364 }
365
366 /* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
367 * Purpose : stops DMA/PIO
368 * Params : host - host
369 * SCpnt - command
370 */
371 static void
372 eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
373 {
374 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
375 if (info->info.scsi.dma != NO_DMA)
376 disable_dma(info->info.scsi.dma);
377 }
378
379 /* Prototype: const char *eesoxscsi_info(struct Scsi_Host * host)
380 * Purpose : returns a descriptive string about this interface,
381 * Params : host - driver host structure to return info for.
382 * Returns : pointer to a static buffer containing null terminated string.
383 */
384 const char *eesoxscsi_info(struct Scsi_Host *host)
385 {
386 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
387 static char string[150];
388
389 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
390 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
391 VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
392
393 return string;
394 }
395
396 /* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
397 * Purpose : Set a driver specific function
398 * Params : host - host to setup
399 * : buffer - buffer containing string describing operation
400 * : length - length of string
401 * Returns : -EINVAL, or 0
402 */
403 static int
404 eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
405 {
406 int ret = length;
407
408 if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
409 buffer += 9;
410 length -= 9;
411
412 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
413 if (buffer[5] == '1')
414 eesoxscsi_terminator_ctl(host, 1);
415 else if (buffer[5] == '0')
416 eesoxscsi_terminator_ctl(host, 0);
417 else
418 ret = -EINVAL;
419 } else
420 ret = -EINVAL;
421 } else
422 ret = -EINVAL;
423
424 return ret;
425 }
426
427 /* Prototype: int eesoxscsi_proc_info(char *buffer, char **start, off_t offset,
428 * int length, int host_no, int inout)
429 * Purpose : Return information about the driver to a user process accessing
430 * the /proc filesystem.
431 * Params : buffer - a buffer to write information to
432 * start - a pointer into this buffer set by this routine to the start
433 * of the required information.
434 * offset - offset into information that we have read upto.
435 * length - length of buffer
436 * host_no - host number to return information for
437 * inout - 0 for reading, 1 for writing.
438 * Returns : length of data written to buffer.
439 */
440 int eesoxscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
441 int length, int inout)
442 {
443 struct eesoxscsi_info *info;
444 char *p = buffer;
445 int pos;
446
447 if (inout == 1)
448 return eesoxscsi_set_proc_info(host, buffer, length);
449
450 info = (struct eesoxscsi_info *)host->hostdata;
451
452 p += sprintf(p, "EESOX SCSI driver v%s\n", VERSION);
453 p += fas216_print_host(&info->info, p);
454 p += sprintf(p, "Term : o%s\n",
455 info->control & EESOX_TERM_ENABLE ? "n" : "ff");
456
457 p += fas216_print_stats(&info->info, p);
458 p += fas216_print_devices(&info->info, p);
459
460 *start = buffer + offset;
461 pos = p - buffer - offset;
462 if (pos > length)
463 pos = length;
464
465 return pos;
466 }
467
468 static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
469 {
470 struct expansion_card *ec = ECARD_DEV(dev);
471 struct Scsi_Host *host = ecard_get_drvdata(ec);
472 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
473
474 return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
475 }
476
477 static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
478 {
479 struct expansion_card *ec = ECARD_DEV(dev);
480 struct Scsi_Host *host = ecard_get_drvdata(ec);
481 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
482 unsigned long flags;
483
484 if (len > 1) {
485 spin_lock_irqsave(host->host_lock, flags);
486 if (buf[0] != '0') {
487 info->control |= EESOX_TERM_ENABLE;
488 } else {
489 info->control &= ~EESOX_TERM_ENABLE;
490 }
491 writeb(info->control, info->ctl_port);
492 spin_unlock_irqrestore(host->host_lock, flags);
493 }
494
495 return len;
496 }
497
498 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
499 eesoxscsi_show_term, eesoxscsi_store_term);
500
501 static struct scsi_host_template eesox_template = {
502 .module = THIS_MODULE,
503 .proc_info = eesoxscsi_proc_info,
504 .name = "EESOX SCSI",
505 .info = eesoxscsi_info,
506 .queuecommand = fas216_queue_command,
507 .eh_host_reset_handler = fas216_eh_host_reset,
508 .eh_bus_reset_handler = fas216_eh_bus_reset,
509 .eh_device_reset_handler = fas216_eh_device_reset,
510 .eh_abort_handler = fas216_eh_abort,
511 .can_queue = 1,
512 .this_id = 7,
513 .sg_tablesize = SG_ALL,
514 .cmd_per_lun = 1,
515 .use_clustering = DISABLE_CLUSTERING,
516 .proc_name = "eesox",
517 };
518
519 static int __devinit
520 eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
521 {
522 struct Scsi_Host *host;
523 struct eesoxscsi_info *info;
524 unsigned long resbase, reslen;
525 void __iomem *base;
526 int ret;
527
528 ret = ecard_request_resources(ec);
529 if (ret)
530 goto out;
531
532 resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST);
533 reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST);
534 base = ioremap(resbase, reslen);
535 if (!base) {
536 ret = -ENOMEM;
537 goto out_region;
538 }
539
540 host = scsi_host_alloc(&eesox_template,
541 sizeof(struct eesoxscsi_info));
542 if (!host) {
543 ret = -ENOMEM;
544 goto out_unmap;
545 }
546
547 ecard_set_drvdata(ec, host);
548
549 info = (struct eesoxscsi_info *)host->hostdata;
550 info->ec = ec;
551 info->base = base;
552 info->ctl_port = base + EESOX_CONTROL;
553 info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
554 writeb(info->control, info->ctl_port);
555
556 info->info.scsi.io_base = base + EESOX_FAS216_OFFSET;
557 info->info.scsi.io_shift = EESOX_FAS216_SHIFT;
558 info->info.scsi.irq = ec->irq;
559 info->info.scsi.dma = ec->dma;
560 info->info.ifcfg.clockrate = 40; /* MHz */
561 info->info.ifcfg.select_timeout = 255;
562 info->info.ifcfg.asyncperiod = 200; /* ns */
563 info->info.ifcfg.sync_max_depth = 7;
564 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
565 info->info.ifcfg.disconnect_ok = 1;
566 info->info.ifcfg.wide_max_size = 0;
567 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
568 info->info.dma.setup = eesoxscsi_dma_setup;
569 info->info.dma.pseudo = eesoxscsi_dma_pseudo;
570 info->info.dma.stop = eesoxscsi_dma_stop;
571
572 ec->irqaddr = base + EESOX_DMASTAT;
573 ec->irqmask = EESOX_STAT_INTR;
574 ec->irq_data = info;
575 ec->ops = &eesoxscsi_ops;
576
577 device_create_file(&ec->dev, &dev_attr_bus_term);
578
579 ret = fas216_init(host);
580 if (ret)
581 goto out_free;
582
583 ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
584 if (ret) {
585 printk("scsi%d: IRQ%d not free: %d\n",
586 host->host_no, ec->irq, ret);
587 goto out_remove;
588 }
589
590 if (info->info.scsi.dma != NO_DMA) {
591 if (request_dma(info->info.scsi.dma, "eesox")) {
592 printk("scsi%d: DMA%d not free, DMA disabled\n",
593 host->host_no, info->info.scsi.dma);
594 info->info.scsi.dma = NO_DMA;
595 } else {
596 set_dma_speed(info->info.scsi.dma, 180);
597 info->info.ifcfg.capabilities |= FASCAP_DMA;
598 info->info.ifcfg.cntl3 |= CNTL3_BS8;
599 }
600 }
601
602 ret = fas216_add(host, &ec->dev);
603 if (ret == 0)
604 goto out;
605
606 if (info->info.scsi.dma != NO_DMA)
607 free_dma(info->info.scsi.dma);
608 free_irq(ec->irq, host);
609
610 out_remove:
611 fas216_remove(host);
612
613 out_free:
614 device_remove_file(&ec->dev, &dev_attr_bus_term);
615 scsi_host_put(host);
616
617 out_unmap:
618 iounmap(base);
619
620 out_region:
621 ecard_release_resources(ec);
622
623 out:
624 return ret;
625 }
626
627 static void __devexit eesoxscsi_remove(struct expansion_card *ec)
628 {
629 struct Scsi_Host *host = ecard_get_drvdata(ec);
630 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
631
632 ecard_set_drvdata(ec, NULL);
633 fas216_remove(host);
634
635 if (info->info.scsi.dma != NO_DMA)
636 free_dma(info->info.scsi.dma);
637 free_irq(ec->irq, info);
638
639 device_remove_file(&ec->dev, &dev_attr_bus_term);
640
641 iounmap(info->base);
642
643 fas216_release(host);
644 scsi_host_put(host);
645 ecard_release_resources(ec);
646 }
647
648 static const struct ecard_id eesoxscsi_cids[] = {
649 { MANU_EESOX, PROD_EESOX_SCSI2 },
650 { 0xffff, 0xffff },
651 };
652
653 static struct ecard_driver eesoxscsi_driver = {
654 .probe = eesoxscsi_probe,
655 .remove = __devexit_p(eesoxscsi_remove),
656 .id_table = eesoxscsi_cids,
657 .drv = {
658 .name = "eesoxscsi",
659 },
660 };
661
662 static int __init eesox_init(void)
663 {
664 return ecard_register_driver(&eesoxscsi_driver);
665 }
666
667 static void __exit eesox_exit(void)
668 {
669 ecard_remove_driver(&eesoxscsi_driver);
670 }
671
672 module_init(eesox_init);
673 module_exit(eesox_exit);
674
675 MODULE_AUTHOR("Russell King");
676 MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
677 module_param_array(term, int, NULL, 0);
678 MODULE_PARM_DESC(term, "SCSI bus termination");
679 MODULE_LICENSE("GPL");
WRT350N Kernel Patches