summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/NCR_D700.c
blob: 8647256ad66df3540e0fee4c264c202ef9bc0eca (plain) (blame)
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
/* -*- mode: c; c-basic-offset: 8 -*- */

/* NCR Dual 700 MCA SCSI Driver
 *
 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
**-----------------------------------------------------------------------------
**  
**  This program is free software; you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation; either version 2 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
 */

/* Notes:
 *
 * Most of the work is done in the chip specific module, 53c700.o
 *
 * TODO List:
 *
 * 1. Extract the SCSI ID from the voyager CMOS table (necessary to
 *    support multi-host environments.
 *
 * */


/* CHANGELOG 
 *
 * Version 2.2
 *
 * Added mca_set_adapter_name().
 *
 * Version 2.1
 *
 * Modularise the driver into a Board piece (this file) and a chip
 * piece 53c700.[ch] and 53c700.scr, added module options.  You can
 * now specify the scsi id by the parameters
 *
 * NCR_D700=slot:<n> [siop:<n>] id:<n> ....
 *
 * They need to be comma separated if compiled into the kernel
 *
 * Version 2.0
 *
 * Initial implementation of TCQ (Tag Command Queueing).  TCQ is full
 * featured and uses the clock algorithm to keep track of outstanding
 * tags and guard against individual tag starvation.  Also fixed a bug
 * in all of the 1.x versions where the D700_data_residue() function
 * was returning results off by 32 bytes (and thus causing the same 32
 * bytes to be written twice corrupting the data block).  It turns out
 * the 53c700 only has a 6 bit DBC and DFIFO registers not 7 bit ones
 * like the 53c710 (The 710 is the only data manual still available,
 * which I'd been using to program the 700).
 *
 * Version 1.2
 *
 * Much improved message handling engine
 *
 * Version 1.1
 *
 * Add code to handle selection reasonably correctly.  By the time we
 * get the selection interrupt, we've already responded, but drop off the
 * bus and hope the selector will go away.
 *
 * Version 1.0:
 *
 *   Initial release.  Fully functional except for procfs and tag
 * command queueing.  Has only been tested on cards with 53c700-66
 * chips and only single ended. Features are
 *
 * 1. Synchronous data transfers to offset 8 (limit of 700-66) and
 *    100ns (10MHz) limit of SCSI-2
 *
 * 2. Disconnection and reselection
 *
 * Testing:
 * 
 *  I've only really tested this with the 700-66 chip, but have done
 * soak tests in multi-device environments to verify that
 * disconnections and reselections are being processed correctly.
 * */

#define NCR_D700_VERSION "2.2"

#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mca.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>

#include "53c700.h"
#include "NCR_D700.h"

static char *NCR_D700;		/* command line from insmod */

MODULE_AUTHOR("James Bottomley");
MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
MODULE_LICENSE("GPL");
module_param(NCR_D700, charp, 0);

static __u8 __devinitdata id_array[2*(MCA_MAX_SLOT_NR + 1)] =
	{ [0 ... 2*(MCA_MAX_SLOT_NR + 1)-1] = 7 };

#ifdef MODULE
#define ARG_SEP ' '
#else
#define ARG_SEP ','
#endif

static int __init
param_setup(char *string)
{
	char *pos = string, *next;
	int slot = -1, siop = -1;

	while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
		int val = (int)simple_strtoul(++next, NULL, 0);

		if(!strncmp(pos, "slot:", 5))
			slot = val;
		else if(!strncmp(pos, "siop:", 5))
			siop = val;
		else if(!strncmp(pos, "id:", 3)) {
			if(slot == -1) {
				printk(KERN_WARNING "NCR D700: Must specify slot for id parameter\n");
			} else if(slot > MCA_MAX_SLOT_NR) {
				printk(KERN_WARNING "NCR D700: Illegal slot %d for id %d\n", slot, val);
			} else {
				if(siop != 0 && siop != 1) {
					id_array[slot*2] = val;
					id_array[slot*2 + 1] =val;
				} else {
					id_array[slot*2 + siop] = val;
				}
			}
		}
		if((pos = strchr(pos, ARG_SEP)) != NULL)
			pos++;
	}
	return 1;
}

/* Host template.  The 53c700 routine NCR_700_detect will
 * fill in all of the missing routines */
static struct scsi_host_template NCR_D700_driver_template = {
	.module			= THIS_MODULE,
	.name			= "NCR Dual 700 MCA",
	.proc_name		= "NCR_D700",
	.this_id		= 7,
};

/* We needs this helper because we have two hosts per struct device */
struct NCR_D700_private {
	struct device		*dev;
	struct Scsi_Host	*hosts[2];
	char			name[30];
	char			pad;
};

static int __devinit
NCR_D700_probe_one(struct NCR_D700_private *p, int siop, int irq,
		   int slot, u32 region, int differential)
{
	struct NCR_700_Host_Parameters *hostdata;
	struct Scsi_Host *host;
	int ret;

	hostdata = kzalloc(sizeof(*hostdata), GFP_KERNEL);
	if (!hostdata) {
		printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
		       "data, detatching\n", siop);
		return -ENOMEM;
	}

	if (!request_region(region, 64, "NCR_D700")) {
		printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n",
				region);
		ret = -ENODEV;
		goto region_failed;
	}
		
	/* Fill in the three required pieces of hostdata */
	hostdata->base = ioport_map(region, 64);
	hostdata->differential = (((1<<siop) & differential) != 0);
	hostdata->clock = NCR_D700_CLOCK_MHZ;
	hostdata->burst_length = 8;

	/* and register the siop */
	host = NCR_700_detect(&NCR_D700_driver_template, hostdata, p->dev);
	if (!host) {
		ret = -ENOMEM;
		goto detect_failed;
	}

	p->hosts[siop] = host;
	/* FIXME: read this from SUS */
	host->this_id = id_array[slot * 2 + siop];
	host->irq = irq;
	host->base = region;
	scsi_scan_host(host);

	return 0;

 detect_failed:
	release_region(region, 64);
 region_failed:
	kfree(hostdata);

	return ret;
}

static irqreturn_t
NCR_D700_intr(int irq, void *data)
{
	struct NCR_D700_private *p = (struct NCR_D700_private *)data;
	int i, found = 0;

	for (i = 0; i < 2; i++)
		if (p->hosts[i] &&
		    NCR_700_intr(irq, p->hosts[i]) == IRQ_HANDLED)
			found++;

	return found ? IRQ_HANDLED : IRQ_NONE;
}

/* Detect a D700 card.  Note, because of the setup --- the chips are
 * essentially connectecd to the MCA bus independently, it is easier
 * to set them up as two separate host adapters, rather than one
 * adapter with two channels */
static int __devinit
NCR_D700_probe(struct device *dev)
{
	struct NCR_D700_private *p;
	int differential;
	static int banner = 1;
	struct mca_device *mca_dev = to_mca_device(dev);
	int slot = mca_dev->slot;
	int found = 0;
	int irq, i;
	int pos3j, pos3k, pos3a, pos3b, pos4;
	__u32 base_addr, offset_addr;

	/* enable board interrupt */
	pos4 = mca_device_read_pos(mca_dev, 4);
	pos4 |= 0x4;
	mca_device_write_pos(mca_dev, 4, pos4);

	mca_device_write_pos(mca_dev, 6, 9);
	pos3j = mca_device_read_pos(mca_dev, 3);
	mca_device_write_pos(mca_dev, 6, 10);
	pos3k = mca_device_read_pos(mca_dev, 3);
	mca_device_write_pos(mca_dev, 6, 0);
	pos3a = mca_device_read_pos(mca_dev, 3);
	mca_device_write_pos(mca_dev, 6, 1);
	pos3b = mca_device_read_pos(mca_dev, 3);

	base_addr = ((pos3j << 8) | pos3k) & 0xfffffff0;
	offset_addr = ((pos3a << 8) | pos3b) & 0xffffff70;

	irq = (pos4 & 0x3) + 11;
	if(irq >= 13)
		irq++;
	if(banner) {
		printk(KERN_NOTICE "NCR D700: Driver Version " NCR_D700_VERSION "\n"
		       "NCR D700:  Copyright (c) 2001 by James.Bottomley@HansenPartnership.com\n"
		       "NCR D700:\n");
		banner = 0;
	}
	/* now do the bus related transforms */
	irq = mca_device_transform_irq(mca_dev, irq);
	base_addr = mca_device_transform_ioport(mca_dev, base_addr);
	offset_addr = mca_device_transform_ioport(mca_dev, offset_addr);

	printk(KERN_NOTICE "NCR D700: found in slot %d  irq = %d  I/O base = 0x%x\n", slot, irq, offset_addr);

	/*outb(BOARD_RESET, base_addr);*/

	/* clear any pending interrupts */
	(void)inb(base_addr + 0x08);
	/* get modctl, used later for setting diff bits */
	switch(differential = (inb(base_addr + 0x08) >> 6)) {
	case 0x00:
		/* only SIOP1 differential */
		differential = 0x02;
		break;
	case 0x01:
		/* Both SIOPs differential */
		differential = 0x03;
		break;
	case 0x03:
		/* No SIOPs differential */
		differential = 0x00;
		break;
	default:
		printk(KERN_ERR "D700: UNEXPECTED DIFFERENTIAL RESULT 0x%02x\n",
		       differential);
		differential = 0x00;
		break;
	}

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return -ENOMEM;

	p->dev = dev;
	snprintf(p->name, sizeof(p->name), "D700(%s)", dev_name(dev));
	if (request_irq(irq, NCR_D700_intr, IRQF_SHARED, p->name, p)) {
		printk(KERN_ERR "D700: request_irq failed\n");
		kfree(p);
		return -EBUSY;
	}
	/* plumb in both 700 chips */
	for (i = 0; i < 2; i++) {
		int err;

		if ((err = NCR_D700_probe_one(p, i, irq, slot,
					      offset_addr + (0x80 * i),
					      differential)) != 0)
			printk("D700: SIOP%d: probe failed, error = %d\n",
			       i, err);
		else
			found++;
	}

	if (!found) {
		kfree(p);
		return -ENODEV;
	}

	mca_device_set_claim(mca_dev, 1);
	mca_device_set_name(mca_dev, "NCR_D700");
	dev_set_drvdata(dev, p);
	return 0;
}

static void __devexit
NCR_D700_remove_one(struct Scsi_Host *host)
{
	scsi_remove_host(host);
	NCR_700_release(host);
	kfree((struct NCR_700_Host_Parameters *)host->hostdata[0]);
	free_irq(host->irq, host);
	release_region(host->base, 64);
}

static int __devexit
NCR_D700_remove(struct device *dev)
{
	struct NCR_D700_private *p = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < 2; i++)
		NCR_D700_remove_one(p->hosts[i]);

	kfree(p);
	return 0;
}

static short NCR_D700_id_table[] = { NCR_D700_MCA_ID, 0 };

static struct mca_driver NCR_D700_driver = {
	.id_table = NCR_D700_id_table,
	.driver = {
		.name		= "NCR_D700",
		.bus		= &mca_bus_type,
		.probe		= NCR_D700_probe,
		.remove		= __devexit_p(NCR_D700_remove),
	},
};

static int __init NCR_D700_init(void)
{
#ifdef MODULE
	if (NCR_D700)
		param_setup(NCR_D700);
#endif

	return mca_register_driver(&NCR_D700_driver);
}

static void __exit NCR_D700_exit(void)
{
	mca_unregister_driver(&NCR_D700_driver);
}

module_init(NCR_D700_init);
module_exit(NCR_D700_exit);

__setup("NCR_D700=", param_setup);