Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6
[linux-2.6] / drivers / scsi / arm / cumana_2.c
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 + 1, map_dir);
182
183                 disable_dma(dmach);
184                 set_dma_sg(dmach, info->sg, bufs + 1);
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 && strcmp(buffer, "CUMANASCSI2") == 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 upto.
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                   = SG_ALL,
394         .cmd_per_lun                    = 1,
395         .use_clustering                 = DISABLE_CLUSTERING,
396         .proc_name                      = "cumanascsi2",
397 };
398
399 static int __devinit
400 cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
401 {
402         struct Scsi_Host *host;
403         struct cumanascsi2_info *info;
404         unsigned long resbase, reslen;
405         void __iomem *base;
406         int ret;
407
408         ret = ecard_request_resources(ec);
409         if (ret)
410                 goto out;
411
412         resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
413         reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
414         base = ioremap(resbase, reslen);
415         if (!base) {
416                 ret = -ENOMEM;
417                 goto out_region;
418         }
419
420         host = scsi_host_alloc(&cumanascsi2_template,
421                                sizeof(struct cumanascsi2_info));
422         if (!host) {
423                 ret = -ENOMEM;
424                 goto out_unmap;
425         }
426
427         ecard_set_drvdata(ec, host);
428
429         info = (struct cumanascsi2_info *)host->hostdata;
430         info->ec        = ec;
431         info->base      = base;
432
433         cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
434
435         info->info.scsi.io_base         = base + CUMANASCSI2_FAS216_OFFSET;
436         info->info.scsi.io_shift        = CUMANASCSI2_FAS216_SHIFT;
437         info->info.scsi.irq             = ec->irq;
438         info->info.scsi.dma             = ec->dma;
439         info->info.ifcfg.clockrate      = 40; /* MHz */
440         info->info.ifcfg.select_timeout = 255;
441         info->info.ifcfg.asyncperiod    = 200; /* ns */
442         info->info.ifcfg.sync_max_depth = 7;
443         info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
444         info->info.ifcfg.disconnect_ok  = 1;
445         info->info.ifcfg.wide_max_size  = 0;
446         info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
447         info->info.dma.setup            = cumanascsi_2_dma_setup;
448         info->info.dma.pseudo           = cumanascsi_2_dma_pseudo;
449         info->info.dma.stop             = cumanascsi_2_dma_stop;
450
451         ec->irqaddr     = info->base + CUMANASCSI2_STATUS;
452         ec->irqmask     = STATUS_INT;
453         ec->irq_data    = info;
454         ec->ops         = &cumanascsi_2_ops;
455
456         ret = fas216_init(host);
457         if (ret)
458                 goto out_free;
459
460         ret = request_irq(ec->irq, cumanascsi_2_intr,
461                           IRQF_DISABLED, "cumanascsi2", info);
462         if (ret) {
463                 printk("scsi%d: IRQ%d not free: %d\n",
464                        host->host_no, ec->irq, ret);
465                 goto out_release;
466         }
467
468         if (info->info.scsi.dma != NO_DMA) {
469                 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
470                         printk("scsi%d: DMA%d not free, using PIO\n",
471                                host->host_no, info->info.scsi.dma);
472                         info->info.scsi.dma = NO_DMA;
473                 } else {
474                         set_dma_speed(info->info.scsi.dma, 180);
475                         info->info.ifcfg.capabilities |= FASCAP_DMA;
476                 }
477         }
478
479         ret = fas216_add(host, &ec->dev);
480         if (ret == 0)
481                 goto out;
482
483         if (info->info.scsi.dma != NO_DMA)
484                 free_dma(info->info.scsi.dma);
485         free_irq(ec->irq, host);
486
487  out_release:
488         fas216_release(host);
489
490  out_free:
491         scsi_host_put(host);
492
493  out_unmap:
494         iounmap(base);
495
496  out_region:
497         ecard_release_resources(ec);
498
499  out:
500         return ret;
501 }
502
503 static void __devexit cumanascsi2_remove(struct expansion_card *ec)
504 {
505         struct Scsi_Host *host = ecard_get_drvdata(ec);
506         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
507
508         ecard_set_drvdata(ec, NULL);
509         fas216_remove(host);
510
511         if (info->info.scsi.dma != NO_DMA)
512                 free_dma(info->info.scsi.dma);
513         free_irq(ec->irq, info);
514
515         iounmap(info->base);
516
517         fas216_release(host);
518         scsi_host_put(host);
519         ecard_release_resources(ec);
520 }
521
522 static const struct ecard_id cumanascsi2_cids[] = {
523         { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
524         { 0xffff, 0xffff },
525 };
526
527 static struct ecard_driver cumanascsi2_driver = {
528         .probe          = cumanascsi2_probe,
529         .remove         = __devexit_p(cumanascsi2_remove),
530         .id_table       = cumanascsi2_cids,
531         .drv = {
532                 .name           = "cumanascsi2",
533         },
534 };
535
536 static int __init cumanascsi2_init(void)
537 {
538         return ecard_register_driver(&cumanascsi2_driver);
539 }
540
541 static void __exit cumanascsi2_exit(void)
542 {
543         ecard_remove_driver(&cumanascsi2_driver);
544 }
545
546 module_init(cumanascsi2_init);
547 module_exit(cumanascsi2_exit);
548
549 MODULE_AUTHOR("Russell King");
550 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
551 module_param_array(term, int, NULL, 0);
552 MODULE_PARM_DESC(term, "SCSI bus termination");
553 MODULE_LICENSE("GPL");