summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/arm/arxescsi.c
blob: 29811f5891ee42c1a5bffec259d41212fd3cbc92 (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
/*
 * linux/arch/arm/drivers/scsi/arxescsi.c
 *
 * Copyright (C) 1997-2000 Russell King, Stefan Hanske
 *
 * This driver is based on experimentation.  Hence, it may have made
 * assumptions about the particular card that I have available, and
 * may not be reliable!
 *
 * Changelog:
 *  30-08-1997	RMK	0.0.0	Created, READONLY version as cumana_2.c
 *  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.
 *  11-06-1998 	SH	0.0.2   Changed to support ARXE 16-bit SCSI card
 *				enabled writing
 *  01-01-2000	SH	0.1.0   Added *real* pseudo dma writing
 *				(arxescsi_pseudo_dma_write)
 *  02-04-2000	RMK	0.1.1	Updated for new error handling code.
 *  22-10-2000  SH		Updated for new registering scheme.
 */
#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/unistd.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>

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

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

struct arxescsi_info {
	FAS216_Info		info;
	struct expansion_card	*ec;
	void __iomem		*base;
};

#define DMADATA_OFFSET	(0x200)

#define DMASTAT_OFFSET	(0x600)
#define DMASTAT_DRQ	(1 << 0)

#define CSTATUS_IRQ	(1 << 0)

#define VERSION "1.10 (23/01/2003 2.5.57)"

/*
 * Function: int arxescsi_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 : 0 if we should not set CMD_WITHDMA for transfer info command
 */
static fasdmatype_t
arxescsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
		       fasdmadir_t direction, fasdmatype_t min_type)
{
	/*
	 * We don't do real DMA
	 */
	return fasdma_pseudo;
}

static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
{
       __asm__ __volatile__(
       "               stmdb   sp!, {r0-r12}\n"
       "               mov     r3, %0\n"
       "               mov     r1, %1\n"
       "               add     r2, r1, #512\n"
       "               mov     r4, #256\n"
       ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
       "               mov     r5, r6, lsl #16\n"
       "               mov     r7, r8, lsl #16\n"
       ".loop_2:       ldrb    r0, [r1, #1536]\n"
       "               tst     r0, #1\n"
       "               beq     .loop_2\n"
       "               stmia   r2, {r5-r8}\n\t"
       "               mov     r9, r10, lsl #16\n"
       "               mov     r11, r12, lsl #16\n"
       ".loop_3:       ldrb    r0, [r1, #1536]\n"
       "               tst     r0, #1\n"
       "               beq     .loop_3\n"
       "               stmia   r2, {r9-r12}\n"
       "               subs    r4, r4, #16\n"
       "               bne     .loop_1\n"
       "               ldmia   sp!, {r0-r12}\n"
       :
       : "r" (addr), "r" (base));
}

/*
 * Function: int arxescsi_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
arxescsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
		    fasdmadir_t direction, int transfer)
{
	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
	unsigned int length, error = 0;
	void __iomem *base = info->info.scsi.io_base;
	unsigned char *addr;

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

	if (direction == DMA_OUT) {
		unsigned int word;
		while (length > 256) {
			if (readb(base + 0x80) & STAT_INT) {
				error = 1;
				break;
			}
			arxescsi_pseudo_dma_write(addr, base);
			addr += 256;
			length -= 256;
		}

		if (!error)
			while (length > 0) {
				if (readb(base + 0x80) & STAT_INT)
					break;
	 
				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
					continue;

				word = *addr | *(addr + 1) << 8;

				writew(word, base + DMADATA_OFFSET);
				if (length > 1) {
					addr += 2;
					length -= 2;
				} else {
					addr += 1;
					length -= 1;
				}
			}
	}
	else {
		if (transfer && (transfer & 255)) {
			while (length >= 256) {
				if (readb(base + 0x80) & STAT_INT) {
					error = 1;
					break;
				}
	    
				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
					continue;

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

		if (!(error))
			while (length > 0) {
				unsigned long word;

				if (readb(base + 0x80) & STAT_INT)
					break;

				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
					continue;

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

/*
 * Function: int arxescsi_dma_stop(host, SCpnt)
 * Purpose : stops DMA/PIO
 * Params  : host  - host
 *	     SCpnt - command
 */
static void arxescsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
{
	/*
	 * no DMA to stop
	 */
}

/*
 * Function: const char *arxescsi_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.
 */
static const char *arxescsi_info(struct Scsi_Host *host)
{
	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
	static char string[150];

	sprintf(string, "%s (%s) in slot %d v%s",
		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
		VERSION);

	return string;
}

/*
 * Function: int arxescsi_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.
 */
static int
arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length,
		   int inout)
{
	struct arxescsi_info *info;
	char *p = buffer;
	int pos;

	info = (struct arxescsi_info *)host->hostdata;
	if (inout == 1)
		return -EINVAL;

	p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION);
	p += fas216_print_host(&info->info, p);
	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 Scsi_Host_Template arxescsi_template = {
	.proc_info			= arxescsi_proc_info,
	.name				= "ARXE SCSI card",
	.info				= arxescsi_info,
	.queuecommand			= fas216_noqueue_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			= 0,
	.this_id			= 7,
	.sg_tablesize			= SG_ALL,
	.cmd_per_lun			= 1,
	.use_clustering			= DISABLE_CLUSTERING,
	.proc_name			= "arxescsi",
};

static int __devinit
arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
{
	struct Scsi_Host *host;
	struct arxescsi_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(&arxescsi_template, sizeof(struct arxescsi_info));
	if (!host) {
		ret = -ENOMEM;
		goto out_unmap;
	}

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

	info->info.scsi.io_base		= base + 0x2000;
	info->info.scsi.irq		= NO_IRQ;
	info->info.scsi.dma		= NO_DMA;
	info->info.scsi.io_shift	= 5;
	info->info.ifcfg.clockrate	= 24; /* MHz */
	info->info.ifcfg.select_timeout = 255;
	info->info.ifcfg.asyncperiod	= 200; /* ns */
	info->info.ifcfg.sync_max_depth	= 0;
	info->info.ifcfg.cntl3		= CNTL3_FASTSCSI | CNTL3_FASTCLK;
	info->info.ifcfg.disconnect_ok	= 0;
	info->info.ifcfg.wide_max_size	= 0;
	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
	info->info.dma.setup		= arxescsi_dma_setup;
	info->info.dma.pseudo		= arxescsi_dma_pseudo;
	info->info.dma.stop		= arxescsi_dma_stop;
		
	ec->irqaddr = base;
	ec->irqmask = CSTATUS_IRQ;

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

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

	fas216_release(host);
 out_unregister:
	scsi_host_put(host);
 out_unmap:
	iounmap(base);
 out_region:
	ecard_release_resources(ec);
 out:
	return ret;
}

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

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

	iounmap(info->base);

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

static const struct ecard_id arxescsi_cids[] = {
	{ MANU_ARXE, PROD_ARXE_SCSI },
	{ 0xffff, 0xffff },
};

static struct ecard_driver arxescsi_driver = {
	.probe		= arxescsi_probe,
	.remove		= __devexit_p(arxescsi_remove),
	.id_table	= arxescsi_cids,
	.drv = {
		.name		= "arxescsi",
	},
};

static int __init init_arxe_scsi_driver(void)
{
	return ecard_register_driver(&arxescsi_driver);
}

static void __exit exit_arxe_scsi_driver(void)
{
	ecard_remove_driver(&arxescsi_driver);
}

module_init(init_arxe_scsi_driver);
module_exit(exit_arxe_scsi_driver);

MODULE_AUTHOR("Stefan Hanske");
MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
MODULE_LICENSE("GPL");