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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / scsi / arm / arxescsi.c
bloba28940156703097e0349a0f5cc5900eaa62296e9
1 /*
2 * linux/arch/arm/drivers/scsi/arxescsi.c
3 *
4 * Copyright (C) 1997-2000 Russell King, Stefan Hanske
5 *
6 * This driver is based on experimentation. Hence, it may have made
7 * assumptions about the particular card that I have available, and
8 * may not be reliable!
9 *
10 * Changelog:
11 * 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c
12 * 22-01-1998 RMK 0.0.1 Updated to 2.1.80
13 * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.
14 * 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card
15 * enabled writing
16 * 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing
17 * (arxescsi_pseudo_dma_write)
18 * 02-04-2000 RMK 0.1.1 Updated for new error handling code.
19 * 22-10-2000 SH Updated for new registering scheme.
20 */
21 #include <linux/module.h>
22 #include <linux/blkdev.h>
23 #include <linux/kernel.h>
24 #include <linux/string.h>
25 #include <linux/ioport.h>
26 #include <linux/sched.h>
27 #include <linux/proc_fs.h>
28 #include <linux/unistd.h>
29 #include <linux/stat.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
32 #include <linux/interrupt.h>
33
34 #include <asm/dma.h>
35 #include <asm/io.h>
36 #include <asm/ecard.h>
37
38 #include "../scsi.h"
39 #include <scsi/scsi_host.h>
40 #include "fas216.h"
41
42 struct arxescsi_info {
43 FAS216_Info info;
44 struct expansion_card *ec;
45 void __iomem *base;
46 };
47
48 #define DMADATA_OFFSET (0x200)
49
50 #define DMASTAT_OFFSET (0x600)
51 #define DMASTAT_DRQ (1 << 0)
52
53 #define CSTATUS_IRQ (1 << 0)
54
55 #define VERSION "1.10 (23/01/2003 2.5.57)"
56
57 /*
58 * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
59 * Purpose : initialises DMA/PIO
60 * Params : host - host
61 * SCpnt - command
62 * direction - DMA on to/off of card
63 * min_type - minimum DMA support that we must have for this transfer
64 * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
65 */
66 static fasdmatype_t
67 arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
68 fasdmadir_t direction, fasdmatype_t min_type)
69 {
70 /*
71 * We don't do real DMA
72 */
73 return fasdma_pseudo;
74 }
75
76 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
77 {
78 __asm__ __volatile__(
79 " stmdb sp!, {r0-r12}\n"
80 " mov r3, %0\n"
81 " mov r1, %1\n"
82 " add r2, r1, #512\n"
83 " mov r4, #256\n"
84 ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"
85 " mov r5, r6, lsl #16\n"
86 " mov r7, r8, lsl #16\n"
87 ".loop_2: ldrb r0, [r1, #1536]\n"
88 " tst r0, #1\n"
89 " beq .loop_2\n"
90 " stmia r2, {r5-r8}\n\t"
91 " mov r9, r10, lsl #16\n"
92 " mov r11, r12, lsl #16\n"
93 ".loop_3: ldrb r0, [r1, #1536]\n"
94 " tst r0, #1\n"
95 " beq .loop_3\n"
96 " stmia r2, {r9-r12}\n"
97 " subs r4, r4, #16\n"
98 " bne .loop_1\n"
99 " ldmia sp!, {r0-r12}\n"
100 :
101 : "r" (addr), "r" (base));
102 }
103
104 /*
105 * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
106 * Purpose : handles pseudo DMA
107 * Params : host - host
108 * SCpnt - command
109 * direction - DMA on to/off of card
110 * transfer - minimum number of bytes we expect to transfer
111 */
112 static void
113 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
114 fasdmadir_t direction, int transfer)
115 {
116 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
117 unsigned int length, error = 0;
118 void __iomem *base = info->info.scsi.io_base;
119 unsigned char *addr;
120
121 length = SCp->this_residual;
122 addr = SCp->ptr;
123
124 if (direction == DMA_OUT) {
125 unsigned int word;
126 while (length > 256) {
127 if (readb(base + 0x80) & STAT_INT) {
128 error = 1;
129 break;
130 }
131 arxescsi_pseudo_dma_write(addr, base);
132 addr += 256;
133 length -= 256;
134 }
135
136 if (!error)
137 while (length > 0) {
138 if (readb(base + 0x80) & STAT_INT)
139 break;
140
141 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
142 continue;
143
144 word = *addr | *(addr + 1) << 8;
145
146 writew(word, base + DMADATA_OFFSET);
147 if (length > 1) {
148 addr += 2;
149 length -= 2;
150 } else {
151 addr += 1;
152 length -= 1;
153 }
154 }
155 }
156 else {
157 if (transfer && (transfer & 255)) {
158 while (length >= 256) {
159 if (readb(base + 0x80) & STAT_INT) {
160 error = 1;
161 break;
162 }
163
164 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
165 continue;
166
167 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
168 addr += 256;
169 length -= 256;
170 }
171 }
172
173 if (!(error))
174 while (length > 0) {
175 unsigned long word;
176
177 if (readb(base + 0x80) & STAT_INT)
178 break;
179
180 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
181 continue;
182
183 word = readw(base + DMADATA_OFFSET);
184 *addr++ = word;
185 if (--length > 0) {
186 *addr++ = word >> 8;
187 length --;
188 }
189 }
190 }
191 }
192
193 /*
194 * Function: int arxescsi_dma_stop(host, SCpnt)
195 * Purpose : stops DMA/PIO
196 * Params : host - host
197 * SCpnt - command
198 */
199 static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
200 {
201 /*
202 * no DMA to stop
203 */
204 }
205
206 /*
207 * Function: const char *arxescsi_info(struct Scsi_Host * host)
208 * Purpose : returns a descriptive string about this interface,
209 * Params : host - driver host structure to return info for.
210 * Returns : pointer to a static buffer containing null terminated string.
211 */
212 static const char *arxescsi_info(struct Scsi_Host *host)
213 {
214 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
215 static char string[150];
216
217 sprintf(string, "%s (%s) in slot %d v%s",
218 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
219 VERSION);
220
221 return string;
222 }
223
224 /*
225 * Function: int arxescsi_proc_info(char *buffer, char **start, off_t offset,
226 * int length, int host_no, int inout)
227 * Purpose : Return information about the driver to a user process accessing
228 * the /proc filesystem.
229 * Params : buffer - a buffer to write information to
230 * start - a pointer into this buffer set by this routine to the start
231 * of the required information.
232 * offset - offset into information that we have read upto.
233 * length - length of buffer
234 * host_no - host number to return information for
235 * inout - 0 for reading, 1 for writing.
236 * Returns : length of data written to buffer.
237 */
238 static int
239 arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length,
240 int inout)
241 {
242 struct arxescsi_info *info;
243 char *p = buffer;
244 int pos;
245
246 info = (struct arxescsi_info *)host->hostdata;
247 if (inout == 1)
248 return -EINVAL;
249
250 p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION);
251 p += fas216_print_host(&info->info, p);
252 p += fas216_print_stats(&info->info, p);
253 p += fas216_print_devices(&info->info, p);
254
255 *start = buffer + offset;
256 pos = p - buffer - offset;
257 if (pos > length)
258 pos = length;
259
260 return pos;
261 }
262
263 static struct scsi_host_template arxescsi_template = {
264 .proc_info = arxescsi_proc_info,
265 .name = "ARXE SCSI card",
266 .info = arxescsi_info,
267 .queuecommand = fas216_noqueue_command,
268 .eh_host_reset_handler = fas216_eh_host_reset,
269 .eh_bus_reset_handler = fas216_eh_bus_reset,
270 .eh_device_reset_handler = fas216_eh_device_reset,
271 .eh_abort_handler = fas216_eh_abort,
272 .can_queue = 0,
273 .this_id = 7,
274 .sg_tablesize = SG_ALL,
275 .cmd_per_lun = 1,
276 .use_clustering = DISABLE_CLUSTERING,
277 .proc_name = "arxescsi",
278 };
279
280 static int __devinit
281 arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
282 {
283 struct Scsi_Host *host;
284 struct arxescsi_info *info;
285 unsigned long resbase, reslen;
286 void __iomem *base;
287 int ret;
288
289 ret = ecard_request_resources(ec);
290 if (ret)
291 goto out;
292
293 resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
294 reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
295 base = ioremap(resbase, reslen);
296 if (!base) {
297 ret = -ENOMEM;
298 goto out_region;
299 }
300
301 host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
302 if (!host) {
303 ret = -ENOMEM;
304 goto out_unmap;
305 }
306
307 info = (struct arxescsi_info *)host->hostdata;
308 info->ec = ec;
309 info->base = base;
310
311 info->info.scsi.io_base = base + 0x2000;
312 info->info.scsi.irq = NO_IRQ;
313 info->info.scsi.dma = NO_DMA;
314 info->info.scsi.io_shift = 5;
315 info->info.ifcfg.clockrate = 24; /* MHz */
316 info->info.ifcfg.select_timeout = 255;
317 info->info.ifcfg.asyncperiod = 200; /* ns */
318 info->info.ifcfg.sync_max_depth = 0;
319 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
320 info->info.ifcfg.disconnect_ok = 0;
321 info->info.ifcfg.wide_max_size = 0;
322 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
323 info->info.dma.setup = arxescsi_dma_setup;
324 info->info.dma.pseudo = arxescsi_dma_pseudo;
325 info->info.dma.stop = arxescsi_dma_stop;
326
327 ec->irqaddr = base;
328 ec->irqmask = CSTATUS_IRQ;
329
330 ret = fas216_init(host);
331 if (ret)
332 goto out_unregister;
333
334 ret = fas216_add(host, &ec->dev);
335 if (ret == 0)
336 goto out;
337
338 fas216_release(host);
339 out_unregister:
340 scsi_host_put(host);
341 out_unmap:
342 iounmap(base);
343 out_region:
344 ecard_release_resources(ec);
345 out:
346 return ret;
347 }
348
349 static void __devexit arxescsi_remove(struct expansion_card *ec)
350 {
351 struct Scsi_Host *host = ecard_get_drvdata(ec);
352 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
353
354 ecard_set_drvdata(ec, NULL);
355 fas216_remove(host);
356
357 iounmap(info->base);
358
359 fas216_release(host);
360 scsi_host_put(host);
361 ecard_release_resources(ec);
362 }
363
364 static const struct ecard_id arxescsi_cids[] = {
365 { MANU_ARXE, PROD_ARXE_SCSI },
366 { 0xffff, 0xffff },
367 };
368
369 static struct ecard_driver arxescsi_driver = {
370 .probe = arxescsi_probe,
371 .remove = __devexit_p(arxescsi_remove),
372 .id_table = arxescsi_cids,
373 .drv = {
374 .name = "arxescsi",
375 },
376 };
377
378 static int __init init_arxe_scsi_driver(void)
379 {
380 return ecard_register_driver(&arxescsi_driver);
381 }
382
383 static void __exit exit_arxe_scsi_driver(void)
384 {
385 ecard_remove_driver(&arxescsi_driver);
386 }
387
388 module_init(init_arxe_scsi_driver);
389 module_exit(exit_arxe_scsi_driver);
390
391 MODULE_AUTHOR("Stefan Hanske");
392 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
393 MODULE_LICENSE("GPL");
394
Linux with added FPC-III support