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Merge branch 'next-queue' into next
[linux-2.6/kvm.git] / drivers / scsi / arm / eesox.c
blobd8435132f46157774559e26a59af0347c2441304
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/proc_fs.h>
31 #include <linux/delay.h>
32 #include <linux/interrupt.h>
33 #include <linux/init.h>
34 #include <linux/dma-mapping.h>
35
36 #include <asm/io.h>
37 #include <asm/dma.h>
38 #include <asm/ecard.h>
39 #include <asm/pgtable.h>
40
41 #include "../scsi.h"
42 #include <scsi/scsi_host.h>
43 #include "fas216.h"
44 #include "scsi.h"
45
46 #include <scsi/scsicam.h>
47
48 #define EESOX_FAS216_OFFSET 0x3000
49 #define EESOX_FAS216_SHIFT 5
50
51 #define EESOX_DMASTAT 0x2800
52 #define EESOX_STAT_INTR 0x01
53 #define EESOX_STAT_DMA 0x02
54
55 #define EESOX_CONTROL 0x2800
56 #define EESOX_INTR_ENABLE 0x04
57 #define EESOX_TERM_ENABLE 0x02
58 #define EESOX_RESET 0x01
59
60 #define EESOX_DMADATA 0x3800
61
62 #define VERSION "1.10 (17/01/2003 2.5.59)"
63
64 /*
65 * Use term=0,1,0,0,0 to turn terminators on/off
66 */
67 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
68
69 #define NR_SG 256
70
71 struct eesoxscsi_info {
72 FAS216_Info info;
73 struct expansion_card *ec;
74 void __iomem *base;
75 void __iomem *ctl_port;
76 unsigned int control;
77 struct scatterlist sg[NR_SG]; /* Scatter DMA list */
78 };
79
80 /* Prototype: void eesoxscsi_irqenable(ec, irqnr)
81 * Purpose : Enable interrupts on EESOX SCSI card
82 * Params : ec - expansion card structure
83 * : irqnr - interrupt number
84 */
85 static void
86 eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
87 {
88 struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
89
90 info->control |= EESOX_INTR_ENABLE;
91
92 writeb(info->control, info->ctl_port);
93 }
94
95 /* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
96 * Purpose : Disable interrupts on EESOX SCSI card
97 * Params : ec - expansion card structure
98 * : irqnr - interrupt number
99 */
100 static void
101 eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
102 {
103 struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
104
105 info->control &= ~EESOX_INTR_ENABLE;
106
107 writeb(info->control, info->ctl_port);
108 }
109
110 static const expansioncard_ops_t eesoxscsi_ops = {
111 .irqenable = eesoxscsi_irqenable,
112 .irqdisable = eesoxscsi_irqdisable,
113 };
114
115 /* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
116 * Purpose : Turn the EESOX SCSI terminators on or off
117 * Params : host - card to turn on/off
118 * : on_off - !0 to turn on, 0 to turn off
119 */
120 static void
121 eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
122 {
123 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
124 unsigned long flags;
125
126 spin_lock_irqsave(host->host_lock, flags);
127 if (on_off)
128 info->control |= EESOX_TERM_ENABLE;
129 else
130 info->control &= ~EESOX_TERM_ENABLE;
131
132 writeb(info->control, info->ctl_port);
133 spin_unlock_irqrestore(host->host_lock, flags);
134 }
135
136 /* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
137 * Purpose : handle interrupts from EESOX SCSI card
138 * Params : irq - interrupt number
139 * dev_id - user-defined (Scsi_Host structure)
140 */
141 static irqreturn_t
142 eesoxscsi_intr(int irq, void *dev_id)
143 {
144 struct eesoxscsi_info *info = dev_id;
145
146 return fas216_intr(&info->info);
147 }
148
149 /* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
150 * Purpose : initialises DMA/PIO
151 * Params : host - host
152 * SCpnt - command
153 * direction - DMA on to/off of card
154 * min_type - minimum DMA support that we must have for this transfer
155 * Returns : type of transfer to be performed
156 */
157 static fasdmatype_t
158 eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
159 fasdmadir_t direction, fasdmatype_t min_type)
160 {
161 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
162 struct device *dev = scsi_get_device(host);
163 int dmach = info->info.scsi.dma;
164
165 if (dmach != NO_DMA &&
166 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
167 int bufs, map_dir, dma_dir;
168
169 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
170
171 if (direction == DMA_OUT)
172 map_dir = DMA_TO_DEVICE,
173 dma_dir = DMA_MODE_WRITE;
174 else
175 map_dir = DMA_FROM_DEVICE,
176 dma_dir = DMA_MODE_READ;
177
178 dma_map_sg(dev, info->sg, bufs, map_dir);
179
180 disable_dma(dmach);
181 set_dma_sg(dmach, info->sg, bufs);
182 set_dma_mode(dmach, dma_dir);
183 enable_dma(dmach);
184 return fasdma_real_all;
185 }
186 /*
187 * We don't do DMA, we only do slow PIO
188 *
189 * Some day, we will do Pseudo DMA
190 */
191 return fasdma_pseudo;
192 }
193
194 static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
195 {
196 const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
197 const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
198 const void __iomem *reg_dmadata = base + EESOX_DMADATA;
199 register const unsigned long mask = 0xffff;
200
201 do {
202 unsigned int status;
203
204 /*
205 * Interrupt request?
206 */
207 status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
208 if (status & STAT_INT)
209 break;
210
211 /*
212 * DMA request active?
213 */
214 status = readb(reg_dmastat);
215 if (!(status & EESOX_STAT_DMA))
216 continue;
217
218 /*
219 * Get number of bytes in FIFO
220 */
221 status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
222 if (status > 16)
223 status = 16;
224 if (status > length)
225 status = length;
226
227 /*
228 * Align buffer.
229 */
230 if (((u32)buf) & 2 && status >= 2) {
231 *(u16 *)buf = readl(reg_dmadata);
232 buf += 2;
233 status -= 2;
234 length -= 2;
235 }
236
237 if (status >= 8) {
238 unsigned long l1, l2;
239
240 l1 = readl(reg_dmadata) & mask;
241 l1 |= readl(reg_dmadata) << 16;
242 l2 = readl(reg_dmadata) & mask;
243 l2 |= readl(reg_dmadata) << 16;
244 *(u32 *)buf = l1;
245 buf += 4;
246 *(u32 *)buf = l2;
247 buf += 4;
248 length -= 8;
249 continue;
250 }
251
252 if (status >= 4) {
253 unsigned long l1;
254
255 l1 = readl(reg_dmadata) & mask;
256 l1 |= readl(reg_dmadata) << 16;
257
258 *(u32 *)buf = l1;
259 buf += 4;
260 length -= 4;
261 continue;
262 }
263
264 if (status >= 2) {
265 *(u16 *)buf = readl(reg_dmadata);
266 buf += 2;
267 length -= 2;
268 }
269 } while (length);
270 }
271
272 static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
273 {
274 const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
275 const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
276 const void __iomem *reg_dmadata = base + EESOX_DMADATA;
277
278 do {
279 unsigned int status;
280
281 /*
282 * Interrupt request?
283 */
284 status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
285 if (status & STAT_INT)
286 break;
287
288 /*
289 * DMA request active?
290 */
291 status = readb(reg_dmastat);
292 if (!(status & EESOX_STAT_DMA))
293 continue;
294
295 /*
296 * Get number of bytes in FIFO
297 */
298 status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
299 if (status > 16)
300 status = 16;
301 status = 16 - status;
302 if (status > length)
303 status = length;
304 status &= ~1;
305
306 /*
307 * Align buffer.
308 */
309 if (((u32)buf) & 2 && status >= 2) {
310 writel(*(u16 *)buf << 16, reg_dmadata);
311 buf += 2;
312 status -= 2;
313 length -= 2;
314 }
315
316 if (status >= 8) {
317 unsigned long l1, l2;
318
319 l1 = *(u32 *)buf;
320 buf += 4;
321 l2 = *(u32 *)buf;
322 buf += 4;
323
324 writel(l1 << 16, reg_dmadata);
325 writel(l1, reg_dmadata);
326 writel(l2 << 16, reg_dmadata);
327 writel(l2, reg_dmadata);
328 length -= 8;
329 continue;
330 }
331
332 if (status >= 4) {
333 unsigned long l1;
334
335 l1 = *(u32 *)buf;
336 buf += 4;
337
338 writel(l1 << 16, reg_dmadata);
339 writel(l1, reg_dmadata);
340 length -= 4;
341 continue;
342 }
343
344 if (status >= 2) {
345 writel(*(u16 *)buf << 16, reg_dmadata);
346 buf += 2;
347 length -= 2;
348 }
349 } while (length);
350 }
351
352 static void
353 eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
354 fasdmadir_t dir, int transfer_size)
355 {
356 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
357 if (dir == DMA_IN) {
358 eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
359 } else {
360 eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
361 }
362 }
363
364 /* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
365 * Purpose : stops DMA/PIO
366 * Params : host - host
367 * SCpnt - command
368 */
369 static void
370 eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
371 {
372 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
373 if (info->info.scsi.dma != NO_DMA)
374 disable_dma(info->info.scsi.dma);
375 }
376
377 /* Prototype: const char *eesoxscsi_info(struct Scsi_Host * host)
378 * Purpose : returns a descriptive string about this interface,
379 * Params : host - driver host structure to return info for.
380 * Returns : pointer to a static buffer containing null terminated string.
381 */
382 const char *eesoxscsi_info(struct Scsi_Host *host)
383 {
384 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
385 static char string[150];
386
387 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
388 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
389 VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
390
391 return string;
392 }
393
394 /* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
395 * Purpose : Set a driver specific function
396 * Params : host - host to setup
397 * : buffer - buffer containing string describing operation
398 * : length - length of string
399 * Returns : -EINVAL, or 0
400 */
401 static int
402 eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
403 {
404 int ret = length;
405
406 if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
407 buffer += 9;
408 length -= 9;
409
410 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
411 if (buffer[5] == '1')
412 eesoxscsi_terminator_ctl(host, 1);
413 else if (buffer[5] == '0')
414 eesoxscsi_terminator_ctl(host, 0);
415 else
416 ret = -EINVAL;
417 } else
418 ret = -EINVAL;
419 } else
420 ret = -EINVAL;
421
422 return ret;
423 }
424
425 /* Prototype: int eesoxscsi_proc_info(char *buffer, char **start, off_t offset,
426 * int length, int host_no, int inout)
427 * Purpose : Return information about the driver to a user process accessing
428 * the /proc filesystem.
429 * Params : buffer - a buffer to write information to
430 * start - a pointer into this buffer set by this routine to the start
431 * of the required information.
432 * offset - offset into information that we have read upto.
433 * length - length of buffer
434 * host_no - host number to return information for
435 * inout - 0 for reading, 1 for writing.
436 * Returns : length of data written to buffer.
437 */
438 int eesoxscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
439 int length, int inout)
440 {
441 struct eesoxscsi_info *info;
442 char *p = buffer;
443 int pos;
444
445 if (inout == 1)
446 return eesoxscsi_set_proc_info(host, buffer, length);
447
448 info = (struct eesoxscsi_info *)host->hostdata;
449
450 p += sprintf(p, "EESOX SCSI driver v%s\n", VERSION);
451 p += fas216_print_host(&info->info, p);
452 p += sprintf(p, "Term : o%s\n",
453 info->control & EESOX_TERM_ENABLE ? "n" : "ff");
454
455 p += fas216_print_stats(&info->info, p);
456 p += fas216_print_devices(&info->info, p);
457
458 *start = buffer + offset;
459 pos = p - buffer - offset;
460 if (pos > length)
461 pos = length;
462
463 return pos;
464 }
465
466 static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
467 {
468 struct expansion_card *ec = ECARD_DEV(dev);
469 struct Scsi_Host *host = ecard_get_drvdata(ec);
470 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
471
472 return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
473 }
474
475 static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
476 {
477 struct expansion_card *ec = ECARD_DEV(dev);
478 struct Scsi_Host *host = ecard_get_drvdata(ec);
479 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
480 unsigned long flags;
481
482 if (len > 1) {
483 spin_lock_irqsave(host->host_lock, flags);
484 if (buf[0] != '0') {
485 info->control |= EESOX_TERM_ENABLE;
486 } else {
487 info->control &= ~EESOX_TERM_ENABLE;
488 }
489 writeb(info->control, info->ctl_port);
490 spin_unlock_irqrestore(host->host_lock, flags);
491 }
492
493 return len;
494 }
495
496 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
497 eesoxscsi_show_term, eesoxscsi_store_term);
498
499 static struct scsi_host_template eesox_template = {
500 .module = THIS_MODULE,
501 .proc_info = eesoxscsi_proc_info,
502 .name = "EESOX SCSI",
503 .info = eesoxscsi_info,
504 .queuecommand = fas216_queue_command,
505 .eh_host_reset_handler = fas216_eh_host_reset,
506 .eh_bus_reset_handler = fas216_eh_bus_reset,
507 .eh_device_reset_handler = fas216_eh_device_reset,
508 .eh_abort_handler = fas216_eh_abort,
509 .can_queue = 1,
510 .this_id = 7,
511 .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
512 .dma_boundary = IOMD_DMA_BOUNDARY,
513 .cmd_per_lun = 1,
514 .use_clustering = DISABLE_CLUSTERING,
515 .proc_name = "eesox",
516 };
517
518 static int __devinit
519 eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
520 {
521 struct Scsi_Host *host;
522 struct eesoxscsi_info *info;
523 void __iomem *base;
524 int ret;
525
526 ret = ecard_request_resources(ec);
527 if (ret)
528 goto out;
529
530 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
531 if (!base) {
532 ret = -ENOMEM;
533 goto out_region;
534 }
535
536 host = scsi_host_alloc(&eesox_template,
537 sizeof(struct eesoxscsi_info));
538 if (!host) {
539 ret = -ENOMEM;
540 goto out_region;
541 }
542
543 ecard_set_drvdata(ec, host);
544
545 info = (struct eesoxscsi_info *)host->hostdata;
546 info->ec = ec;
547 info->base = base;
548 info->ctl_port = base + EESOX_CONTROL;
549 info->control = term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
550 writeb(info->control, info->ctl_port);
551
552 info->info.scsi.io_base = base + EESOX_FAS216_OFFSET;
553 info->info.scsi.io_shift = EESOX_FAS216_SHIFT;
554 info->info.scsi.irq = ec->irq;
555 info->info.scsi.dma = ec->dma;
556 info->info.ifcfg.clockrate = 40; /* MHz */
557 info->info.ifcfg.select_timeout = 255;
558 info->info.ifcfg.asyncperiod = 200; /* ns */
559 info->info.ifcfg.sync_max_depth = 7;
560 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
561 info->info.ifcfg.disconnect_ok = 1;
562 info->info.ifcfg.wide_max_size = 0;
563 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
564 info->info.dma.setup = eesoxscsi_dma_setup;
565 info->info.dma.pseudo = eesoxscsi_dma_pseudo;
566 info->info.dma.stop = eesoxscsi_dma_stop;
567
568 ec->irqaddr = base + EESOX_DMASTAT;
569 ec->irqmask = EESOX_STAT_INTR;
570
571 ecard_setirq(ec, &eesoxscsi_ops, info);
572
573 device_create_file(&ec->dev, &dev_attr_bus_term);
574
575 ret = fas216_init(host);
576 if (ret)
577 goto out_free;
578
579 ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
580 if (ret) {
581 printk("scsi%d: IRQ%d not free: %d\n",
582 host->host_no, ec->irq, ret);
583 goto out_remove;
584 }
585
586 if (info->info.scsi.dma != NO_DMA) {
587 if (request_dma(info->info.scsi.dma, "eesox")) {
588 printk("scsi%d: DMA%d not free, DMA disabled\n",
589 host->host_no, info->info.scsi.dma);
590 info->info.scsi.dma = NO_DMA;
591 } else {
592 set_dma_speed(info->info.scsi.dma, 180);
593 info->info.ifcfg.capabilities |= FASCAP_DMA;
594 info->info.ifcfg.cntl3 |= CNTL3_BS8;
595 }
596 }
597
598 ret = fas216_add(host, &ec->dev);
599 if (ret == 0)
600 goto out;
601
602 if (info->info.scsi.dma != NO_DMA)
603 free_dma(info->info.scsi.dma);
604 free_irq(ec->irq, host);
605
606 out_remove:
607 fas216_remove(host);
608
609 out_free:
610 device_remove_file(&ec->dev, &dev_attr_bus_term);
611 scsi_host_put(host);
612
613 out_region:
614 ecard_release_resources(ec);
615
616 out:
617 return ret;
618 }
619
620 static void __devexit eesoxscsi_remove(struct expansion_card *ec)
621 {
622 struct Scsi_Host *host = ecard_get_drvdata(ec);
623 struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
624
625 ecard_set_drvdata(ec, NULL);
626 fas216_remove(host);
627
628 if (info->info.scsi.dma != NO_DMA)
629 free_dma(info->info.scsi.dma);
630 free_irq(ec->irq, info);
631
632 device_remove_file(&ec->dev, &dev_attr_bus_term);
633
634 fas216_release(host);
635 scsi_host_put(host);
636 ecard_release_resources(ec);
637 }
638
639 static const struct ecard_id eesoxscsi_cids[] = {
640 { MANU_EESOX, PROD_EESOX_SCSI2 },
641 { 0xffff, 0xffff },
642 };
643
644 static struct ecard_driver eesoxscsi_driver = {
645 .probe = eesoxscsi_probe,
646 .remove = __devexit_p(eesoxscsi_remove),
647 .id_table = eesoxscsi_cids,
648 .drv = {
649 .name = "eesoxscsi",
650 },
651 };
652
653 static int __init eesox_init(void)
654 {
655 return ecard_register_driver(&eesoxscsi_driver);
656 }
657
658 static void __exit eesox_exit(void)
659 {
660 ecard_remove_driver(&eesoxscsi_driver);
661 }
662
663 module_init(eesox_init);
664 module_exit(eesox_exit);
665
666 MODULE_AUTHOR("Russell King");
667 MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
668 module_param_array(term, int, NULL, 0);
669 MODULE_PARM_DESC(term, "SCSI bus termination");
670 MODULE_LICENSE("GPL");
kernel-based virtual machine