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-rw-r--r--drivers/scsi/NCR_D700.c406
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diff --git a/drivers/scsi/NCR_D700.c b/drivers/scsi/NCR_D700.c
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1/* -*- mode: c; c-basic-offset: 8 -*- */
2
3/* NCR Dual 700 MCA SCSI Driver
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6**-----------------------------------------------------------------------------
7**
8** This program is free software; you can redistribute it and/or modify
9** it under the terms of the GNU General Public License as published by
10** the Free Software Foundation; either version 2 of the License, or
11** (at your option) any later version.
12**
13** This program is distributed in the hope that it will be useful,
14** but WITHOUT ANY WARRANTY; without even the implied warranty of
15** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16** GNU General Public License for more details.
17**
18** You should have received a copy of the GNU General Public License
19** along with this program; if not, write to the Free Software
20** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21**
22**-----------------------------------------------------------------------------
23 */
24
25/* Notes:
26 *
27 * Most of the work is done in the chip specific module, 53c700.o
28 *
29 * TODO List:
30 *
31 * 1. Extract the SCSI ID from the voyager CMOS table (necessary to
32 * support multi-host environments.
33 *
34 * */
35
36
37/* CHANGELOG
38 *
39 * Version 2.2
40 *
41 * Added mca_set_adapter_name().
42 *
43 * Version 2.1
44 *
45 * Modularise the driver into a Board piece (this file) and a chip
46 * piece 53c700.[ch] and 53c700.scr, added module options. You can
47 * now specify the scsi id by the parameters
48 *
49 * NCR_D700=slot:<n> [siop:<n>] id:<n> ....
50 *
51 * They need to be comma separated if compiled into the kernel
52 *
53 * Version 2.0
54 *
55 * Initial implementation of TCQ (Tag Command Queueing). TCQ is full
56 * featured and uses the clock algorithm to keep track of outstanding
57 * tags and guard against individual tag starvation. Also fixed a bug
58 * in all of the 1.x versions where the D700_data_residue() function
59 * was returning results off by 32 bytes (and thus causing the same 32
60 * bytes to be written twice corrupting the data block). It turns out
61 * the 53c700 only has a 6 bit DBC and DFIFO registers not 7 bit ones
62 * like the 53c710 (The 710 is the only data manual still available,
63 * which I'd been using to program the 700).
64 *
65 * Version 1.2
66 *
67 * Much improved message handling engine
68 *
69 * Version 1.1
70 *
71 * Add code to handle selection reasonably correctly. By the time we
72 * get the selection interrupt, we've already responded, but drop off the
73 * bus and hope the selector will go away.
74 *
75 * Version 1.0:
76 *
77 * Initial release. Fully functional except for procfs and tag
78 * command queueing. Has only been tested on cards with 53c700-66
79 * chips and only single ended. Features are
80 *
81 * 1. Synchronous data transfers to offset 8 (limit of 700-66) and
82 * 100ns (10MHz) limit of SCSI-2
83 *
84 * 2. Disconnection and reselection
85 *
86 * Testing:
87 *
88 * I've only really tested this with the 700-66 chip, but have done
89 * soak tests in multi-device environments to verify that
90 * disconnections and reselections are being processed correctly.
91 * */
92
93#define NCR_D700_VERSION "2.2"
94
95#include <linux/blkdev.h>
96#include <linux/interrupt.h>
97#include <linux/kernel.h>
98#include <linux/module.h>
99#include <linux/mca.h>
100#include <linux/interrupt.h>
101#include <asm/io.h>
102#include <scsi/scsi_host.h>
103#include <scsi/scsi_device.h>
104#include <scsi/scsi_transport.h>
105#include <scsi/scsi_transport_spi.h>
106
107#include "53c700.h"
108#include "NCR_D700.h"
109
110static char *NCR_D700; /* command line from insmod */
111
112MODULE_AUTHOR("James Bottomley");
113MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
114MODULE_LICENSE("GPL");
115module_param(NCR_D700, charp, 0);
116
117static __u8 __initdata id_array[2*(MCA_MAX_SLOT_NR + 1)] =
118 { [0 ... 2*(MCA_MAX_SLOT_NR + 1)-1] = 7 };
119
120#ifdef MODULE
121#define ARG_SEP ' '
122#else
123#define ARG_SEP ','
124#endif
125
126static int __init
127param_setup(char *string)
128{
129 char *pos = string, *next;
130 int slot = -1, siop = -1;
131
132 while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
133 int val = (int)simple_strtoul(++next, NULL, 0);
134
135 if(!strncmp(pos, "slot:", 5))
136 slot = val;
137 else if(!strncmp(pos, "siop:", 5))
138 siop = val;
139 else if(!strncmp(pos, "id:", 3)) {
140 if(slot == -1) {
141 printk(KERN_WARNING "NCR D700: Must specify slot for id parameter\n");
142 } else if(slot > MCA_MAX_SLOT_NR) {
143 printk(KERN_WARNING "NCR D700: Illegal slot %d for id %d\n", slot, val);
144 } else {
145 if(siop != 0 && siop != 1) {
146 id_array[slot*2] = val;
147 id_array[slot*2 + 1] =val;
148 } else {
149 id_array[slot*2 + siop] = val;
150 }
151 }
152 }
153 if((pos = strchr(pos, ARG_SEP)) != NULL)
154 pos++;
155 }
156 return 1;
157}
158
159/* Host template. The 53c700 routine NCR_700_detect will
160 * fill in all of the missing routines */
161static struct scsi_host_template NCR_D700_driver_template = {
162 .module = THIS_MODULE,
163 .name = "NCR Dual 700 MCA",
164 .proc_name = "NCR_D700",
165 .this_id = 7,
166};
167
168/* We needs this helper because we have two hosts per struct device */
169struct NCR_D700_private {
170 struct device *dev;
171 struct Scsi_Host *hosts[2];
172 char name[30];
173 char pad;
174};
175
176static int
177NCR_D700_probe_one(struct NCR_D700_private *p, int siop, int irq,
178 int slot, u32 region, int differential)
179{
180 struct NCR_700_Host_Parameters *hostdata;
181 struct Scsi_Host *host;
182 int ret;
183
184 hostdata = kmalloc(sizeof(*hostdata), GFP_KERNEL);
185 if (!hostdata) {
186 printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
187 "data, detatching\n", siop);
188 return -ENOMEM;
189 }
190 memset(hostdata, 0, sizeof(*hostdata));
191
192 if (!request_region(region, 64, "NCR_D700")) {
193 printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n",
194 region);
195 ret = -ENODEV;
196 goto region_failed;
197 }
198
199 /* Fill in the three required pieces of hostdata */
200 hostdata->base = region;
201 hostdata->differential = (((1<<siop) & differential) != 0);
202 hostdata->clock = NCR_D700_CLOCK_MHZ;
203
204 NCR_700_set_io_mapped(hostdata);
205
206 /* and register the siop */
207 host = NCR_700_detect(&NCR_D700_driver_template, hostdata, p->dev);
208 if (!host) {
209 ret = -ENOMEM;
210 goto detect_failed;
211 }
212
213 p->hosts[siop] = host;
214 /* FIXME: read this from SUS */
215 host->this_id = id_array[slot * 2 + siop];
216 host->irq = irq;
217 scsi_scan_host(host);
218
219 return 0;
220
221 detect_failed:
222 release_region(host->base, 64);
223 region_failed:
224 kfree(hostdata);
225
226 return ret;
227}
228
229static int
230NCR_D700_intr(int irq, void *data, struct pt_regs *regs)
231{
232 struct NCR_D700_private *p = (struct NCR_D700_private *)data;
233 int i, found = 0;
234
235 for (i = 0; i < 2; i++)
236 if (p->hosts[i] &&
237 NCR_700_intr(irq, p->hosts[i], regs) == IRQ_HANDLED)
238 found++;
239
240 return found ? IRQ_HANDLED : IRQ_NONE;
241}
242
243/* Detect a D700 card. Note, because of the setup --- the chips are
244 * essentially connectecd to the MCA bus independently, it is easier
245 * to set them up as two separate host adapters, rather than one
246 * adapter with two channels */
247static int
248NCR_D700_probe(struct device *dev)
249{
250 struct NCR_D700_private *p;
251 int differential;
252 static int banner = 1;
253 struct mca_device *mca_dev = to_mca_device(dev);
254 int slot = mca_dev->slot;
255 int found = 0;
256 int irq, i;
257 int pos3j, pos3k, pos3a, pos3b, pos4;
258 __u32 base_addr, offset_addr;
259
260 /* enable board interrupt */
261 pos4 = mca_device_read_pos(mca_dev, 4);
262 pos4 |= 0x4;
263 mca_device_write_pos(mca_dev, 4, pos4);
264
265 mca_device_write_pos(mca_dev, 6, 9);
266 pos3j = mca_device_read_pos(mca_dev, 3);
267 mca_device_write_pos(mca_dev, 6, 10);
268 pos3k = mca_device_read_pos(mca_dev, 3);
269 mca_device_write_pos(mca_dev, 6, 0);
270 pos3a = mca_device_read_pos(mca_dev, 3);
271 mca_device_write_pos(mca_dev, 6, 1);
272 pos3b = mca_device_read_pos(mca_dev, 3);
273
274 base_addr = ((pos3j << 8) | pos3k) & 0xfffffff0;
275 offset_addr = ((pos3a << 8) | pos3b) & 0xffffff70;
276
277 irq = (pos4 & 0x3) + 11;
278 if(irq >= 13)
279 irq++;
280 if(banner) {
281 printk(KERN_NOTICE "NCR D700: Driver Version " NCR_D700_VERSION "\n"
282 "NCR D700: Copyright (c) 2001 by James.Bottomley@HansenPartnership.com\n"
283 "NCR D700:\n");
284 banner = 0;
285 }
286 /* now do the bus related transforms */
287 irq = mca_device_transform_irq(mca_dev, irq);
288 base_addr = mca_device_transform_ioport(mca_dev, base_addr);
289 offset_addr = mca_device_transform_ioport(mca_dev, offset_addr);
290
291 printk(KERN_NOTICE "NCR D700: found in slot %d irq = %d I/O base = 0x%x\n", slot, irq, offset_addr);
292
293 /*outb(BOARD_RESET, base_addr);*/
294
295 /* clear any pending interrupts */
296 (void)inb(base_addr + 0x08);
297 /* get modctl, used later for setting diff bits */
298 switch(differential = (inb(base_addr + 0x08) >> 6)) {
299 case 0x00:
300 /* only SIOP1 differential */
301 differential = 0x02;
302 break;
303 case 0x01:
304 /* Both SIOPs differential */
305 differential = 0x03;
306 break;
307 case 0x03:
308 /* No SIOPs differential */
309 differential = 0x00;
310 break;
311 default:
312 printk(KERN_ERR "D700: UNEXPECTED DIFFERENTIAL RESULT 0x%02x\n",
313 differential);
314 differential = 0x00;
315 break;
316 }
317
318 p = kmalloc(sizeof(*p), GFP_KERNEL);
319 if (!p)
320 return -ENOMEM;
321 memset(p, '\0', sizeof(*p));
322 p->dev = dev;
323 snprintf(p->name, sizeof(p->name), "D700(%s)", dev->bus_id);
324 if (request_irq(irq, NCR_D700_intr, SA_SHIRQ, p->name, p)) {
325 printk(KERN_ERR "D700: request_irq failed\n");
326 kfree(p);
327 return -EBUSY;
328 }
329 /* plumb in both 700 chips */
330 for (i = 0; i < 2; i++) {
331 int err;
332
333 if ((err = NCR_D700_probe_one(p, i, slot, irq,
334 offset_addr + (0x80 * i),
335 differential)) != 0)
336 printk("D700: SIOP%d: probe failed, error = %d\n",
337 i, err);
338 else
339 found++;
340 }
341
342 if (!found) {
343 kfree(p);
344 return -ENODEV;
345 }
346
347 mca_device_set_claim(mca_dev, 1);
348 mca_device_set_name(mca_dev, "NCR_D700");
349 dev_set_drvdata(dev, p);
350 return 0;
351}
352
353static void
354NCR_D700_remove_one(struct Scsi_Host *host)
355{
356 scsi_remove_host(host);
357 NCR_700_release(host);
358 kfree((struct NCR_700_Host_Parameters *)host->hostdata[0]);
359 free_irq(host->irq, host);
360 release_region(host->base, 64);
361}
362
363static int
364NCR_D700_remove(struct device *dev)
365{
366 struct NCR_D700_private *p = dev_get_drvdata(dev);
367 int i;
368
369 for (i = 0; i < 2; i++)
370 NCR_D700_remove_one(p->hosts[i]);
371
372 kfree(p);
373 return 0;
374}
375
376static short NCR_D700_id_table[] = { NCR_D700_MCA_ID, 0 };
377
378static struct mca_driver NCR_D700_driver = {
379 .id_table = NCR_D700_id_table,
380 .driver = {
381 .name = "NCR_D700",
382 .bus = &mca_bus_type,
383 .probe = NCR_D700_probe,
384 .remove = NCR_D700_remove,
385 },
386};
387
388static int __init NCR_D700_init(void)
389{
390#ifdef MODULE
391 if (NCR_D700)
392 param_setup(NCR_D700);
393#endif
394
395 return mca_register_driver(&NCR_D700_driver);
396}
397
398static void __exit NCR_D700_exit(void)
399{
400 mca_unregister_driver(&NCR_D700_driver);
401}
402
403module_init(NCR_D700_init);
404module_exit(NCR_D700_exit);
405
406__setup("NCR_D700=", param_setup);