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 <asm/io.h>
101 #include <scsi/scsi_host.h>
102 #include <scsi/scsi_device.h>
103 #include <scsi/scsi_transport.h>
104 #include <scsi/scsi_transport_spi.h>
105
106 #include "53c700.h"
107 #include "NCR_D700.h"
108
109 char *NCR_D700; /* command line from insmod */
110
111 MODULE_AUTHOR("James Bottomley");
112 MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
113 MODULE_LICENSE("GPL");
114 module_param(NCR_D700, charp, 0);
115
116 static __u8 __initdata id_array[2*(MCA_MAX_SLOT_NR + 1)] =
117 { [0 ... 2*(MCA_MAX_SLOT_NR + 1)-1] = 7 };
118
119 #ifdef MODULE
120 #define ARG_SEP ' '
121 #else
122 #define ARG_SEP ','
123 #endif
124
125 static int __init
126 param_setup(char *string)
127 {
128 char *pos = string, *next;
129 int slot = -1, siop = -1;
130
131 while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
132 int val = (int)simple_strtoul(++next, NULL, 0);
133
134 if(!strncmp(pos, "slot:", 5))
135 slot = val;
136 else if(!strncmp(pos, "siop:", 5))
137 siop = val;
138 else if(!strncmp(pos, "id:", 3)) {
139 if(slot == -1) {
140 printk(KERN_WARNING "NCR D700: Must specify slot for id parameter\n");
141 } else if(slot > MCA_MAX_SLOT_NR) {
142 printk(KERN_WARNING "NCR D700: Illegal slot %d for id %d\n", slot, val);
143 } else {
144 if(siop != 0 && siop != 1) {
145 id_array[slot*2] = val;
146 id_array[slot*2 + 1] =val;
147 } else {
148 id_array[slot*2 + siop] = val;
149 }
150 }
151 }
152 if((pos = strchr(pos, ARG_SEP)) != NULL)
153 pos++;
154 }
155 return 1;
156 }
157
158 /* Host template. The 53c700 routine NCR_700_detect will
159 * fill in all of the missing routines */
160 static struct scsi_host_template NCR_D700_driver_template = {
161 .module = THIS_MODULE,
162 .name = "NCR Dual 700 MCA",
163 .proc_name = "NCR_D700",
164 .this_id = 7,
165 };
166
167 /* We needs this helper because we have two hosts per struct device */
168 struct NCR_D700_private {
169 struct device *dev;
170 struct Scsi_Host *hosts[2];
171 };
172
173 static int
174 NCR_D700_probe_one(struct NCR_D700_private *p, int siop,
175 int irq, int slot, u32 region, int differential)
176 {
177 struct NCR_700_Host_Parameters *hostdata;
178 struct Scsi_Host *host;
179 int ret;
180
181 hostdata = kmalloc(sizeof(*hostdata), GFP_KERNEL);
182 if (!hostdata) {
183 printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
184 "data, detatching\n", siop);
185 return -ENOMEM;
186 }
187 memset(hostdata, 0, sizeof(*hostdata));
188
189 if (!request_region(region, 64, "NCR_D700")) {
190 printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n",
191 region);
192 ret = -ENODEV;
193 goto region_failed;
194 }
195
196 /* Fill in the three required pieces of hostdata */
197 hostdata->base = region;
198 hostdata->differential = (((1<<siop) & differential) != 0);
199 hostdata->clock = NCR_D700_CLOCK_MHZ;
200
201 NCR_700_set_io_mapped(hostdata);
202
203 /* and register the siop */
204 host = NCR_700_detect(&NCR_D700_driver_template, hostdata,
205 p->dev, irq,
206 /* FIXME: read this from SUS */
207 id_array[slot * 2 + siop]);
208 if (!host) {
209 ret = -ENOMEM;
210 goto detect_failed;
211 }
212
213 scsi_scan_host(host);
214
215 p->hosts[siop] = host;
216 return 0;
217
218 detect_failed:
219 release_region(host->base, 64);
220 region_failed:
221 kfree(hostdata);
222
223 return ret;
224 }
225
226 /* Detect a D700 card. Note, because of the setup --- the chips are
227 * essentially connectecd to the MCA bus independently, it is easier
228 * to set them up as two separate host adapters, rather than one
229 * adapter with two channels */
230 static int
231 NCR_D700_probe(struct device *dev)
232 {
233 struct NCR_D700_private *p;
234 int differential;
235 static int banner = 1;
236 struct mca_device *mca_dev = to_mca_device(dev);
237 int slot = mca_dev->slot;
238 int found = 0;
239 int irq, i;
240 int pos3j, pos3k, pos3a, pos3b, pos4;
241 __u32 base_addr, offset_addr;
242
243 /* enable board interrupt */
244 pos4 = mca_device_read_pos(mca_dev, 4);
245 pos4 |= 0x4;
246 mca_device_write_pos(mca_dev, 4, pos4);
247
248 mca_device_write_pos(mca_dev, 6, 9);
249 pos3j = mca_device_read_pos(mca_dev, 3);
250 mca_device_write_pos(mca_dev, 6, 10);
251 pos3k = mca_device_read_pos(mca_dev, 3);
252 mca_device_write_pos(mca_dev, 6, 0);
253 pos3a = mca_device_read_pos(mca_dev, 3);
254 mca_device_write_pos(mca_dev, 6, 1);
255 pos3b = mca_device_read_pos(mca_dev, 3);
256
257 base_addr = ((pos3j << 8) | pos3k) & 0xfffffff0;
258 offset_addr = ((pos3a << 8) | pos3b) & 0xffffff70;
259
260 irq = (pos4 & 0x3) + 11;
261 if(irq >= 13)
262 irq++;
263 if(banner) {
264 printk(KERN_NOTICE "NCR D700: Driver Version " NCR_D700_VERSION "\n"
265 "NCR D700: Copyright (c) 2001 by James.Bottomley@HansenPartnership.com\n"
266 "NCR D700:\n");
267 banner = 0;
268 }
269 /* now do the bus related transforms */
270 irq = mca_device_transform_irq(mca_dev, irq);
271 base_addr = mca_device_transform_ioport(mca_dev, base_addr);
272 offset_addr = mca_device_transform_ioport(mca_dev, offset_addr);
273
274 printk(KERN_NOTICE "NCR D700: found in slot %d irq = %d I/O base = 0x%x\n", slot, irq, offset_addr);
275
276 /*outb(BOARD_RESET, base_addr);*/
277
278 /* clear any pending interrupts */
279 (void)inb(base_addr + 0x08);
280 /* get modctl, used later for setting diff bits */
281 switch(differential = (inb(base_addr + 0x08) >> 6)) {
282 case 0x00:
283 /* only SIOP1 differential */
284 differential = 0x02;
285 break;
286 case 0x01:
287 /* Both SIOPs differential */
288 differential = 0x03;
289 break;
290 case 0x03:
291 /* No SIOPs differential */
292 differential = 0x00;
293 break;
294 default:
295 printk(KERN_ERR "D700: UNEXPECTED DIFFERENTIAL RESULT 0x%02x\n",
296 differential);
297 differential = 0x00;
298 break;
299 }
300
301 p = kmalloc(sizeof(*p), GFP_KERNEL);
302 if (!p)
303 return -ENOMEM;
304 p->dev = dev;
305
306 /* plumb in both 700 chips */
307 for (i = 0; i < 2; i++) {
308 int err;
309
310 if ((err = NCR_D700_probe_one(p, i, irq, slot,
311 offset_addr + (0x80 * i),
312 differential)) != 0)
313 printk("D700: SIOP%d: probe failed, error = %d\n",
314 i, err);
315 else
316 found++;
317 }
318
319 if (!found) {
320 kfree(p);
321 return -ENODEV;
322 }
323
324 mca_device_set_claim(mca_dev, 1);
325 mca_device_set_name(mca_dev, "NCR_D700");
326 dev_set_drvdata(dev, p);
327 return 0;
328 }
329
330 static void
331 NCR_D700_remove_one(struct Scsi_Host *host)
332 {
333 scsi_remove_host(host);
334 NCR_700_release(host);
335 kfree((struct NCR_700_Host_Parameters *)host->hostdata[0]);
336 free_irq(host->irq, host);
337 release_region(host->base, 64);
338 }
339
340 static int
341 NCR_D700_remove(struct device *dev)
342 {
343 struct NCR_D700_private *p = dev_get_drvdata(dev);
344 int i;
345
346 for (i = 0; i < 2; i++)
347 NCR_D700_remove_one(p->hosts[i]);
348
349 kfree(p);
350 return 0;
351 }
352
353 static short NCR_D700_id_table[] = { NCR_D700_MCA_ID, 0 };
354
355 struct mca_driver NCR_D700_driver = {
356 .id_table = NCR_D700_id_table,
357 .driver = {
358 .name = "NCR_D700",
359 .bus = &mca_bus_type,
360 .probe = NCR_D700_probe,
361 .remove = NCR_D700_remove,
362 },
363 };
364
365 static int __init NCR_D700_init(void)
366 {
367 #ifdef MODULE
368 if (NCR_D700)
369 param_setup(NCR_D700);
370 #endif
371
372 return mca_register_driver(&NCR_D700_driver);
373 }
374
375 static void __exit NCR_D700_exit(void)
376 {
377 mca_unregister_driver(&NCR_D700_driver);
378 }
379
380 module_init(NCR_D700_init);
381 module_exit(NCR_D700_exit);
382
383 __setup("NCR_D700=", param_setup);
384
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