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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / scsi / arm / cumana_2.c
blob0ef0644eeb29138cb74483d7fd951e454be1a13a
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/irq.h>
35 #include <asm/pgtable.h>
36
37 #include "../scsi.h"
38 #include <scsi/scsi_host.h>
39 #include "fas216.h"
40 #include "scsi.h"
41
42 #include <scsi/scsicam.h>
43
44 #define CUMANASCSI2_STATUS (0x0000)
45 #define STATUS_INT (1 << 0)
46 #define STATUS_DRQ (1 << 1)
47 #define STATUS_LATCHED (1 << 3)
48
49 #define CUMANASCSI2_ALATCH (0x0014)
50 #define ALATCH_ENA_INT (3)
51 #define ALATCH_DIS_INT (2)
52 #define ALATCH_ENA_TERM (5)
53 #define ALATCH_DIS_TERM (4)
54 #define ALATCH_ENA_BIT32 (11)
55 #define ALATCH_DIS_BIT32 (10)
56 #define ALATCH_ENA_DMA (13)
57 #define ALATCH_DIS_DMA (12)
58 #define ALATCH_DMA_OUT (15)
59 #define ALATCH_DMA_IN (14)
60
61 #define CUMANASCSI2_PSEUDODMA (0x0200)
62
63 #define CUMANASCSI2_FAS216_OFFSET (0x0300)
64 #define CUMANASCSI2_FAS216_SHIFT 2
65
66 /*
67 * Version
68 */
69 #define VERSION "1.00 (13/11/2002 2.5.47)"
70
71 /*
72 * Use term=0,1,0,0,0 to turn terminators on/off
73 */
74 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
75
76 #define NR_SG 256
77
78 struct cumanascsi2_info {
79 FAS216_Info info;
80 struct expansion_card *ec;
81 void __iomem *base;
82 unsigned int terms; /* Terminator state */
83 struct scatterlist sg[NR_SG]; /* Scatter DMA list */
84 };
85
86 #define CSTATUS_IRQ (1 << 0)
87 #define CSTATUS_DRQ (1 << 1)
88
89 /* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
90 * Purpose : Enable interrupts on Cumana SCSI 2 card
91 * Params : ec - expansion card structure
92 * : irqnr - interrupt number
93 */
94 static void
95 cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
96 {
97 struct cumanascsi2_info *info = ec->irq_data;
98 writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
99 }
100
101 /* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
102 * Purpose : Disable interrupts on Cumana SCSI 2 card
103 * Params : ec - expansion card structure
104 * : irqnr - interrupt number
105 */
106 static void
107 cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
108 {
109 struct cumanascsi2_info *info = ec->irq_data;
110 writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
111 }
112
113 static const expansioncard_ops_t cumanascsi_2_ops = {
114 .irqenable = cumanascsi_2_irqenable,
115 .irqdisable = cumanascsi_2_irqdisable,
116 };
117
118 /* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
119 * Purpose : Turn the Cumana SCSI 2 terminators on or off
120 * Params : host - card to turn on/off
121 * : on_off - !0 to turn on, 0 to turn off
122 */
123 static void
124 cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
125 {
126 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
127
128 if (on_off) {
129 info->terms = 1;
130 writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
131 } else {
132 info->terms = 0;
133 writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
134 }
135 }
136
137 /* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
138 * Purpose : handle interrupts from Cumana SCSI 2 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 cumanascsi_2_intr(int irq, void *dev_id, struct pt_regs *regs)
145 {
146 struct cumanascsi2_info *info = dev_id;
147
148 return fas216_intr(&info->info);
149 }
150
151 /* Prototype: fasdmatype_t cumanascsi_2_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 cumanascsi_2_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
161 fasdmadir_t direction, fasdmatype_t min_type)
162 {
163 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
164 struct device *dev = scsi_get_device(host);
165 int dmach = info->info.scsi.dma;
166
167 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
168
169 if (dmach != NO_DMA &&
170 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
171 int bufs, map_dir, dma_dir, alatch_dir;
172
173 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
174
175 if (direction == DMA_OUT)
176 map_dir = DMA_TO_DEVICE,
177 dma_dir = DMA_MODE_WRITE,
178 alatch_dir = ALATCH_DMA_OUT;
179 else
180 map_dir = DMA_FROM_DEVICE,
181 dma_dir = DMA_MODE_READ,
182 alatch_dir = ALATCH_DMA_IN;
183
184 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
185
186 disable_dma(dmach);
187 set_dma_sg(dmach, info->sg, bufs + 1);
188 writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
189 set_dma_mode(dmach, dma_dir);
190 enable_dma(dmach);
191 writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
192 writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
193 return fasdma_real_all;
194 }
195
196 /*
197 * If we're not doing DMA,
198 * we'll do pseudo DMA
199 */
200 return fasdma_pio;
201 }
202
203 /*
204 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
205 * Purpose : handles pseudo DMA
206 * Params : host - host
207 * SCpnt - command
208 * direction - DMA on to/off of card
209 * transfer - minimum number of bytes we expect to transfer
210 */
211 static void
212 cumanascsi_2_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
213 fasdmadir_t direction, int transfer)
214 {
215 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
216 unsigned int length;
217 unsigned char *addr;
218
219 length = SCp->this_residual;
220 addr = SCp->ptr;
221
222 if (direction == DMA_OUT)
223 #if 0
224 while (length > 1) {
225 unsigned long word;
226 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
227
228 if (status & STATUS_INT)
229 goto end;
230
231 if (!(status & STATUS_DRQ))
232 continue;
233
234 word = *addr | *(addr + 1) << 8;
235 writew(word, info->base + CUMANASCSI2_PSEUDODMA);
236 addr += 2;
237 length -= 2;
238 }
239 #else
240 printk ("PSEUDO_OUT???\n");
241 #endif
242 else {
243 if (transfer && (transfer & 255)) {
244 while (length >= 256) {
245 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
246
247 if (status & STATUS_INT)
248 return;
249
250 if (!(status & STATUS_DRQ))
251 continue;
252
253 readsw(info->base + CUMANASCSI2_PSEUDODMA,
254 addr, 256 >> 1);
255 addr += 256;
256 length -= 256;
257 }
258 }
259
260 while (length > 0) {
261 unsigned long word;
262 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
263
264 if (status & STATUS_INT)
265 return;
266
267 if (!(status & STATUS_DRQ))
268 continue;
269
270 word = readw(info->base + CUMANASCSI2_PSEUDODMA);
271 *addr++ = word;
272 if (--length > 0) {
273 *addr++ = word >> 8;
274 length --;
275 }
276 }
277 }
278 }
279
280 /* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
281 * Purpose : stops DMA/PIO
282 * Params : host - host
283 * SCpnt - command
284 */
285 static void
286 cumanascsi_2_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
287 {
288 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
289 if (info->info.scsi.dma != NO_DMA) {
290 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
291 disable_dma(info->info.scsi.dma);
292 }
293 }
294
295 /* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
296 * Purpose : returns a descriptive string about this interface,
297 * Params : host - driver host structure to return info for.
298 * Returns : pointer to a static buffer containing null terminated string.
299 */
300 const char *cumanascsi_2_info(struct Scsi_Host *host)
301 {
302 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
303 static char string[150];
304
305 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
306 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
307 VERSION, info->terms ? "n" : "ff");
308
309 return string;
310 }
311
312 /* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
313 * Purpose : Set a driver specific function
314 * Params : host - host to setup
315 * : buffer - buffer containing string describing operation
316 * : length - length of string
317 * Returns : -EINVAL, or 0
318 */
319 static int
320 cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
321 {
322 int ret = length;
323
324 if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) {
325 buffer += 11;
326 length -= 11;
327
328 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
329 if (buffer[5] == '1')
330 cumanascsi_2_terminator_ctl(host, 1);
331 else if (buffer[5] == '0')
332 cumanascsi_2_terminator_ctl(host, 0);
333 else
334 ret = -EINVAL;
335 } else
336 ret = -EINVAL;
337 } else
338 ret = -EINVAL;
339
340 return ret;
341 }
342
343 /* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
344 * int length, int host_no, int inout)
345 * Purpose : Return information about the driver to a user process accessing
346 * the /proc filesystem.
347 * Params : buffer - a buffer to write information to
348 * start - a pointer into this buffer set by this routine to the start
349 * of the required information.
350 * offset - offset into information that we have read upto.
351 * length - length of buffer
352 * host_no - host number to return information for
353 * inout - 0 for reading, 1 for writing.
354 * Returns : length of data written to buffer.
355 */
356 int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset,
357 int length, int inout)
358 {
359 struct cumanascsi2_info *info;
360 char *p = buffer;
361 int pos;
362
363 if (inout == 1)
364 return cumanascsi_2_set_proc_info(host, buffer, length);
365
366 info = (struct cumanascsi2_info *)host->hostdata;
367
368 p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION);
369 p += fas216_print_host(&info->info, p);
370 p += sprintf(p, "Term : o%s\n",
371 info->terms ? "n" : "ff");
372
373 p += fas216_print_stats(&info->info, p);
374 p += fas216_print_devices(&info->info, p);
375
376 *start = buffer + offset;
377 pos = p - buffer - offset;
378 if (pos > length)
379 pos = length;
380
381 return pos;
382 }
383
384 static Scsi_Host_Template cumanascsi2_template = {
385 .module = THIS_MODULE,
386 .proc_info = cumanascsi_2_proc_info,
387 .name = "Cumana SCSI II",
388 .info = cumanascsi_2_info,
389 .queuecommand = fas216_queue_command,
390 .eh_host_reset_handler = fas216_eh_host_reset,
391 .eh_bus_reset_handler = fas216_eh_bus_reset,
392 .eh_device_reset_handler = fas216_eh_device_reset,
393 .eh_abort_handler = fas216_eh_abort,
394 .can_queue = 1,
395 .this_id = 7,
396 .sg_tablesize = SG_ALL,
397 .cmd_per_lun = 1,
398 .use_clustering = DISABLE_CLUSTERING,
399 .proc_name = "cumanascsi2",
400 };
401
402 static int __devinit
403 cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
404 {
405 struct Scsi_Host *host;
406 struct cumanascsi2_info *info;
407 unsigned long resbase, reslen;
408 void __iomem *base;
409 int ret;
410
411 ret = ecard_request_resources(ec);
412 if (ret)
413 goto out;
414
415 resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
416 reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
417 base = ioremap(resbase, reslen);
418 if (!base) {
419 ret = -ENOMEM;
420 goto out_region;
421 }
422
423 host = scsi_host_alloc(&cumanascsi2_template,
424 sizeof(struct cumanascsi2_info));
425 if (!host) {
426 ret = -ENOMEM;
427 goto out_unmap;
428 }
429
430 ecard_set_drvdata(ec, host);
431
432 info = (struct cumanascsi2_info *)host->hostdata;
433 info->ec = ec;
434 info->base = base;
435
436 cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
437
438 info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET;
439 info->info.scsi.io_shift = CUMANASCSI2_FAS216_SHIFT;
440 info->info.scsi.irq = ec->irq;
441 info->info.scsi.dma = ec->dma;
442 info->info.ifcfg.clockrate = 40; /* MHz */
443 info->info.ifcfg.select_timeout = 255;
444 info->info.ifcfg.asyncperiod = 200; /* ns */
445 info->info.ifcfg.sync_max_depth = 7;
446 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
447 info->info.ifcfg.disconnect_ok = 1;
448 info->info.ifcfg.wide_max_size = 0;
449 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
450 info->info.dma.setup = cumanascsi_2_dma_setup;
451 info->info.dma.pseudo = cumanascsi_2_dma_pseudo;
452 info->info.dma.stop = cumanascsi_2_dma_stop;
453
454 ec->irqaddr = info->base + CUMANASCSI2_STATUS;
455 ec->irqmask = STATUS_INT;
456 ec->irq_data = info;
457 ec->ops = &cumanascsi_2_ops;
458
459 ret = fas216_init(host);
460 if (ret)
461 goto out_free;
462
463 ret = request_irq(ec->irq, cumanascsi_2_intr,
464 SA_INTERRUPT, "cumanascsi2", info);
465 if (ret) {
466 printk("scsi%d: IRQ%d not free: %d\n",
467 host->host_no, ec->irq, ret);
468 goto out_release;
469 }
470
471 if (info->info.scsi.dma != NO_DMA) {
472 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
473 printk("scsi%d: DMA%d not free, using PIO\n",
474 host->host_no, info->info.scsi.dma);
475 info->info.scsi.dma = NO_DMA;
476 } else {
477 set_dma_speed(info->info.scsi.dma, 180);
478 info->info.ifcfg.capabilities |= FASCAP_DMA;
479 }
480 }
481
482 ret = fas216_add(host, &ec->dev);
483 if (ret == 0)
484 goto out;
485
486 if (info->info.scsi.dma != NO_DMA)
487 free_dma(info->info.scsi.dma);
488 free_irq(ec->irq, host);
489
490 out_release:
491 fas216_release(host);
492
493 out_free:
494 scsi_host_put(host);
495
496 out_unmap:
497 iounmap(base);
498
499 out_region:
500 ecard_release_resources(ec);
501
502 out:
503 return ret;
504 }
505
506 static void __devexit cumanascsi2_remove(struct expansion_card *ec)
507 {
508 struct Scsi_Host *host = ecard_get_drvdata(ec);
509 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
510
511 ecard_set_drvdata(ec, NULL);
512 fas216_remove(host);
513
514 if (info->info.scsi.dma != NO_DMA)
515 free_dma(info->info.scsi.dma);
516 free_irq(ec->irq, info);
517
518 iounmap(info->base);
519
520 fas216_release(host);
521 scsi_host_put(host);
522 ecard_release_resources(ec);
523 }
524
525 static const struct ecard_id cumanascsi2_cids[] = {
526 { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
527 { 0xffff, 0xffff },
528 };
529
530 static struct ecard_driver cumanascsi2_driver = {
531 .probe = cumanascsi2_probe,
532 .remove = __devexit_p(cumanascsi2_remove),
533 .id_table = cumanascsi2_cids,
534 .drv = {
535 .name = "cumanascsi2",
536 },
537 };
538
539 static int __init cumanascsi2_init(void)
540 {
541 return ecard_register_driver(&cumanascsi2_driver);
542 }
543
544 static void __exit cumanascsi2_exit(void)
545 {
546 ecard_remove_driver(&cumanascsi2_driver);
547 }
548
549 module_init(cumanascsi2_init);
550 module_exit(cumanascsi2_exit);
551
552 MODULE_AUTHOR("Russell King");
553 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
554 MODULE_PARM(term, "1-8i");
555 MODULE_PARM_DESC(term, "SCSI bus termination");
556 MODULE_LICENSE("GPL");
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