Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[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/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                           IRQF_DISABLED, "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");