summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/arm/cumana_2.c
blob: 583d2d8c8335eba6b6924786984836c30d89e3df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
/*
 *  linux/drivers/acorn/scsi/cumana_2.c
 *
 *  Copyright (C) 1997-2005 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Changelog:
 *   30-08-1997	RMK	0.0.0	Created, READONLY version.
 *   22-01-1998	RMK	0.0.1	Updated to 2.1.80.
 *   15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
 *   02-05-1998	RMK	0.0.2	Updated & added DMA support.
 *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
 *   18-08-1998	RMK	0.0.3	Fixed synchronous transfer depth.
 *   02-04-2000	RMK	0.0.4	Updated for new error handling code.
 */
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/io.h>
#include <asm/pgtable.h>

#include "../scsi.h"
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"

#include <scsi/scsicam.h>

#define CUMANASCSI2_STATUS		(0x0000)
#define STATUS_INT			(1 << 0)
#define STATUS_DRQ			(1 << 1)
#define STATUS_LATCHED			(1 << 3)

#define CUMANASCSI2_ALATCH		(0x0014)
#define ALATCH_ENA_INT			(3)
#define ALATCH_DIS_INT			(2)
#define ALATCH_ENA_TERM			(5)
#define ALATCH_DIS_TERM			(4)
#define ALATCH_ENA_BIT32		(11)
#define ALATCH_DIS_BIT32		(10)
#define ALATCH_ENA_DMA			(13)
#define ALATCH_DIS_DMA			(12)
#define ALATCH_DMA_OUT			(15)
#define ALATCH_DMA_IN			(14)

#define CUMANASCSI2_PSEUDODMA		(0x0200)

#define CUMANASCSI2_FAS216_OFFSET	(0x0300)
#define CUMANASCSI2_FAS216_SHIFT	2

/*
 * Version
 */
#define VERSION "1.00 (13/11/2002 2.5.47)"

/*
 * Use term=0,1,0,0,0 to turn terminators on/off
 */
static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };

#define NR_SG	256

struct cumanascsi2_info {
	FAS216_Info		info;
	struct expansion_card	*ec;
	void __iomem		*base;
	unsigned int		terms;		/* Terminator state	*/
	struct scatterlist	sg[NR_SG];	/* Scatter DMA list	*/
};

#define CSTATUS_IRQ	(1 << 0)
#define CSTATUS_DRQ	(1 << 1)

/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
 * Purpose  : Enable interrupts on Cumana SCSI 2 card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
{
	struct cumanascsi2_info *info = ec->irq_data;
	writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
}

/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
 * Purpose  : Disable interrupts on Cumana SCSI 2 card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
{
	struct cumanascsi2_info *info = ec->irq_data;
	writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
}

static const expansioncard_ops_t cumanascsi_2_ops = {
	.irqenable	= cumanascsi_2_irqenable,
	.irqdisable	= cumanascsi_2_irqdisable,
};

/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
 * Purpose  : Turn the Cumana SCSI 2 terminators on or off
 * Params   : host   - card to turn on/off
 *          : on_off - !0 to turn on, 0 to turn off
 */
static void
cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;

	if (on_off) {
		info->terms = 1;
		writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
	} else {
		info->terms = 0;
		writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
	}
}

/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
 * Purpose  : handle interrupts from Cumana SCSI 2 card
 * Params   : irq    - interrupt number
 *	      dev_id - user-defined (Scsi_Host structure)
 *	      regs   - processor registers at interrupt
 */
static irqreturn_t
cumanascsi_2_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	struct cumanascsi2_info *info = dev_id;

	return fas216_intr(&info->info);
}

/* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
 * Purpose  : initialises DMA/PIO
 * Params   : host      - host
 *	      SCpnt     - command
 *	      direction - DMA on to/off of card
 *	      min_type  - minimum DMA support that we must have for this transfer
 * Returns  : type of transfer to be performed
 */
static fasdmatype_t
cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
		       fasdmadir_t direction, fasdmatype_t min_type)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	struct device *dev = scsi_get_device(host);
	int dmach = info->info.scsi.dma;

	writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);

	if (dmach != NO_DMA &&
	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
		int bufs, map_dir, dma_dir, alatch_dir;

		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);

		if (direction == DMA_OUT)
			map_dir = DMA_TO_DEVICE,
			dma_dir = DMA_MODE_WRITE,
			alatch_dir = ALATCH_DMA_OUT;
		else
			map_dir = DMA_FROM_DEVICE,
			dma_dir = DMA_MODE_READ,
			alatch_dir = ALATCH_DMA_IN;

		dma_map_sg(dev, info->sg, bufs + 1, map_dir);

		disable_dma(dmach);
		set_dma_sg(dmach, info->sg, bufs + 1);
		writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
		set_dma_mode(dmach, dma_dir);
		enable_dma(dmach);
		writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
		writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
		return fasdma_real_all;
	}

	/*
	 * If we're not doing DMA,
	 *  we'll do pseudo DMA
	 */
	return fasdma_pio;
}

/*
 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
 * Purpose  : handles pseudo DMA
 * Params   : host      - host
 *	      SCpnt     - command
 *	      direction - DMA on to/off of card
 *	      transfer  - minimum number of bytes we expect to transfer
 */
static void
cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
			fasdmadir_t direction, int transfer)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	unsigned int length;
	unsigned char *addr;

	length = SCp->this_residual;
	addr = SCp->ptr;

	if (direction == DMA_OUT)
#if 0
		while (length > 1) {
			unsigned long word;
			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);

			if (status & STATUS_INT)
				goto end;

			if (!(status & STATUS_DRQ))
				continue;

			word = *addr | *(addr + 1) << 8;
			writew(word, info->base + CUMANASCSI2_PSEUDODMA);
			addr += 2;
			length -= 2;
		}
#else
		printk ("PSEUDO_OUT???\n");
#endif
	else {
		if (transfer && (transfer & 255)) {
			while (length >= 256) {
				unsigned int status = readb(info->base + CUMANASCSI2_STATUS);

				if (status & STATUS_INT)
					return;
	    
				if (!(status & STATUS_DRQ))
					continue;

				readsw(info->base + CUMANASCSI2_PSEUDODMA,
				       addr, 256 >> 1);
				addr += 256;
				length -= 256;
			}
		}

		while (length > 0) {
			unsigned long word;
			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);

			if (status & STATUS_INT)
				return;

			if (!(status & STATUS_DRQ))
				continue;

			word = readw(info->base + CUMANASCSI2_PSEUDODMA);
			*addr++ = word;
			if (--length > 0) {
				*addr++ = word >> 8;
				length --;
			}
		}
	}
}

/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
 * Purpose  : stops DMA/PIO
 * Params   : host  - host
 *	      SCpnt - command
 */
static void
cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	if (info->info.scsi.dma != NO_DMA) {
		writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
		disable_dma(info->info.scsi.dma);
	}
}

/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
 * Purpose  : returns a descriptive string about this interface,
 * Params   : host - driver host structure to return info for.
 * Returns  : pointer to a static buffer containing null terminated string.
 */
const char *cumanascsi_2_info(struct Scsi_Host *host)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	static char string[150];

	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
		VERSION, info->terms ? "n" : "ff");

	return string;
}

/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 * Purpose  : Set a driver specific function
 * Params   : host   - host to setup
 *          : buffer - buffer containing string describing operation
 *          : length - length of string
 * Returns  : -EINVAL, or 0
 */
static int
cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
{
	int ret = length;

	if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) {
		buffer += 11;
		length -= 11;

		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
			if (buffer[5] == '1')
				cumanascsi_2_terminator_ctl(host, 1);
			else if (buffer[5] == '0')
				cumanascsi_2_terminator_ctl(host, 0);
			else
				ret = -EINVAL;
		} else
			ret = -EINVAL;
	} else
		ret = -EINVAL;

	return ret;
}

/* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
 *					 int length, int host_no, int inout)
 * Purpose  : Return information about the driver to a user process accessing
 *	      the /proc filesystem.
 * Params   : buffer - a buffer to write information to
 *	      start  - a pointer into this buffer set by this routine to the start
 *		       of the required information.
 *	      offset - offset into information that we have read upto.
 *	      length - length of buffer
 *	      host_no - host number to return information for
 *	      inout  - 0 for reading, 1 for writing.
 * Returns  : length of data written to buffer.
 */
int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset,
			    int length, int inout)
{
	struct cumanascsi2_info *info;
	char *p = buffer;
	int pos;

	if (inout == 1)
		return cumanascsi_2_set_proc_info(host, buffer, length);

	info = (struct cumanascsi2_info *)host->hostdata;

	p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION);
	p += fas216_print_host(&info->info, p);
	p += sprintf(p, "Term    : o%s\n",
			info->terms ? "n" : "ff");

	p += fas216_print_stats(&info->info, p);
	p += fas216_print_devices(&info->info, p);

	*start = buffer + offset;
	pos = p - buffer - offset;
	if (pos > length)
		pos = length;

	return pos;
}

static struct scsi_host_template cumanascsi2_template = {
	.module				= THIS_MODULE,
	.proc_info			= cumanascsi_2_proc_info,
	.name				= "Cumana SCSI II",
	.info				= cumanascsi_2_info,
	.queuecommand			= fas216_queue_command,
	.eh_host_reset_handler		= fas216_eh_host_reset,
	.eh_bus_reset_handler		= fas216_eh_bus_reset,
	.eh_device_reset_handler	= fas216_eh_device_reset,
	.eh_abort_handler		= fas216_eh_abort,
	.can_queue			= 1,
	.this_id			= 7,
	.sg_tablesize			= SG_ALL,
	.cmd_per_lun			= 1,
	.use_clustering			= DISABLE_CLUSTERING,
	.proc_name			= "cumanascsi2",
};

static int __devinit
cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
{
	struct Scsi_Host *host;
	struct cumanascsi2_info *info;
	unsigned long resbase, reslen;
	void __iomem *base;
	int ret;

	ret = ecard_request_resources(ec);
	if (ret)
		goto out;

	resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
	reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
	base = ioremap(resbase, reslen);
	if (!base) {
		ret = -ENOMEM;
		goto out_region;
	}

	host = scsi_host_alloc(&cumanascsi2_template,
			       sizeof(struct cumanascsi2_info));
	if (!host) {
		ret = -ENOMEM;
		goto out_unmap;
	}

	ecard_set_drvdata(ec, host);

	info = (struct cumanascsi2_info *)host->hostdata;
	info->ec	= ec;
	info->base	= base;

	cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);

	info->info.scsi.io_base		= base + CUMANASCSI2_FAS216_OFFSET;
	info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;
	info->info.scsi.irq		= ec->irq;
	info->info.scsi.dma		= ec->dma;
	info->info.ifcfg.clockrate	= 40; /* MHz */
	info->info.ifcfg.select_timeout	= 255;
	info->info.ifcfg.asyncperiod	= 200; /* ns */
	info->info.ifcfg.sync_max_depth	= 7;
	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
	info->info.ifcfg.disconnect_ok	= 1;
	info->info.ifcfg.wide_max_size	= 0;
	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
	info->info.dma.setup		= cumanascsi_2_dma_setup;
	info->info.dma.pseudo		= cumanascsi_2_dma_pseudo;
	info->info.dma.stop		= cumanascsi_2_dma_stop;

	ec->irqaddr	= info->base + CUMANASCSI2_STATUS;
	ec->irqmask	= STATUS_INT;
	ec->irq_data	= info;
	ec->ops		= &cumanascsi_2_ops;

	ret = fas216_init(host);
	if (ret)
		goto out_free;

	ret = request_irq(ec->irq, cumanascsi_2_intr,
			  SA_INTERRUPT, "cumanascsi2", info);
	if (ret) {
		printk("scsi%d: IRQ%d not free: %d\n",
		       host->host_no, ec->irq, ret);
		goto out_release;
	}

	if (info->info.scsi.dma != NO_DMA) {
		if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
			printk("scsi%d: DMA%d not free, using PIO\n",
			       host->host_no, info->info.scsi.dma);
			info->info.scsi.dma = NO_DMA;
		} else {
			set_dma_speed(info->info.scsi.dma, 180);
			info->info.ifcfg.capabilities |= FASCAP_DMA;
		}
	}

	ret = fas216_add(host, &ec->dev);
	if (ret == 0)
		goto out;

	if (info->info.scsi.dma != NO_DMA)
		free_dma(info->info.scsi.dma);
	free_irq(ec->irq, host);

 out_release:
	fas216_release(host);

 out_free:
	scsi_host_put(host);

 out_unmap:
	iounmap(base);

 out_region:
	ecard_release_resources(ec);

 out:
	return ret;
}

static void __devexit cumanascsi2_remove(struct expansion_card *ec)
{
	struct Scsi_Host *host = ecard_get_drvdata(ec);
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;

	ecard_set_drvdata(ec, NULL);
	fas216_remove(host);

	if (info->info.scsi.dma != NO_DMA)
		free_dma(info->info.scsi.dma);
	free_irq(ec->irq, info);

	iounmap(info->base);

	fas216_release(host);
	scsi_host_put(host);
	ecard_release_resources(ec);
}

static const struct ecard_id cumanascsi2_cids[] = {
	{ MANU_CUMANA, PROD_CUMANA_SCSI_2 },
	{ 0xffff, 0xffff },
};

static struct ecard_driver cumanascsi2_driver = {
	.probe		= cumanascsi2_probe,
	.remove		= __devexit_p(cumanascsi2_remove),
	.id_table	= cumanascsi2_cids,
	.drv = {
		.name		= "cumanascsi2",
	},
};

static int __init cumanascsi2_init(void)
{
	return ecard_register_driver(&cumanascsi2_driver);
}

static void __exit cumanascsi2_exit(void)
{
	ecard_remove_driver(&cumanascsi2_driver);
}

module_init(cumanascsi2_init);
module_exit(cumanascsi2_exit);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
MODULE_PARM(term, "1-8i");
MODULE_PARM_DESC(term, "SCSI bus termination");
MODULE_LICENSE("GPL");