File: /usr/src/linux/drivers/acorn/scsi/arxescsi.c
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/blk.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
33 #include <asm/dma.h>
34 #include <asm/io.h>
35 #include <asm/irq.h>
36 #include <asm/ecard.h>
37
38 #include "../../scsi/sd.h"
39 #include "../../scsi/hosts.h"
40 #include "arxescsi.h"
41 #include "fas216.h"
42
43 /* Hmm - this should go somewhere else */
44 #define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
45
46 /* Configuration */
47 #define ARXESCSI_XTALFREQ 24
48 #define ARXESCSI_ASYNC_PERIOD 200
49 #define ARXESCSI_SYNC_DEPTH 0
50
51 /*
52 * List of devices that the driver will recognise
53 */
54 #define ARXESCSI_LIST { MANU_ARXE, PROD_ARXE_SCSI }
55
56 /*
57 * Version
58 */
59 #define VER_MAJOR 0
60 #define VER_MINOR 1
61 #define VER_PATCH 1
62
63 static struct expansion_card *ecs[MAX_ECARDS];
64
65 /*
66 * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
67 * Purpose : initialises DMA/PIO
68 * Params : host - host
69 * SCpnt - command
70 * direction - DMA on to/off of card
71 * min_type - minimum DMA support that we must have for this transfer
72 * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
73 */
74 static fasdmatype_t
75 arxescsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp,
76 fasdmadir_t direction, fasdmatype_t min_type)
77 {
78 /*
79 * We don't do real DMA
80 */
81 return fasdma_pseudo;
82 }
83
84
85
86 /* Faster transfer routines, written by SH to speed up the loops */
87
88 static __inline__ unsigned char getb(unsigned int address, unsigned int reg)
89 {
90 unsigned char value;
91
92 __asm__ __volatile__(
93 "ldrb %0, [%1, %2, lsl #5]"
94 : "=r" (value)
95 : "r" (address), "r" (reg) );
96 return value;
97 }
98
99 static __inline__ unsigned int getw(unsigned int address, unsigned int reg)
100 {
101 unsigned int value;
102
103 __asm__ __volatile__(
104 "ldr %0, [%1, %2, lsl #5]\n\t"
105 "mov %0, %0, lsl #16\n\t"
106 "mov %0, %0, lsr #16"
107 : "=r" (value)
108 : "r" (address), "r" (reg) );
109 return value;
110 }
111
112 static __inline__ void putw(unsigned int address, unsigned int reg, unsigned long value)
113 {
114 __asm__ __volatile__(
115 "mov %0, %0, lsl #16\n\t"
116 "str %0, [%1, %2, lsl #5]"
117 :
118 : "r" (value), "r" (address), "r" (reg) );
119 }
120
121 void arxescsi_pseudo_dma_write(unsigned char *addr, unsigned int io)
122 {
123 __asm__ __volatile__(
124 " stmdb sp!, {r0-r12}\n"
125 " mov r3, %0\n"
126 " mov r1, %1\n"
127 " add r2, r1, #512\n"
128 " mov r4, #256\n"
129 ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"
130 " mov r5, r6, lsl #16\n"
131 " mov r7, r8, lsl #16\n"
132 ".loop_2: ldrb r0, [r1, #1536]\n"
133 " tst r0, #1\n"
134 " beq .loop_2\n"
135 " stmia r2, {r5-r8}\n\t"
136 " mov r9, r10, lsl #16\n"
137 " mov r11, r12, lsl #16\n"
138 ".loop_3: ldrb r0, [r1, #1536]\n"
139 " tst r0, #1\n"
140 " beq .loop_3\n"
141 " stmia r2, {r9-r12}\n"
142 " subs r4, r4, #16\n"
143 " bne .loop_1\n"
144 " ldmia sp!, {r0-r12}\n"
145 :
146 : "r" (addr), "r" (io) );
147 }
148
149 /*
150 * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
151 * Purpose : handles pseudo DMA
152 * Params : host - host
153 * SCpnt - command
154 * direction - DMA on to/off of card
155 * transfer - minimum number of bytes we expect to transfer
156 */
157 void arxescsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
158 fasdmadir_t direction, int transfer)
159 {
160 ARXEScsi_Info *info = (ARXEScsi_Info *)host->hostdata;
161 unsigned int length, io, error=0;
162 unsigned char *addr;
163
164 length = SCp->this_residual;
165 addr = SCp->ptr;
166 io = __ioaddr(host->io_port);
167
168 if (direction == DMA_OUT) {
169 unsigned int word;
170 while (length > 256) {
171 if (getb(io, 4) & STAT_INT) {
172 error=1;
173 break;
174 }
175 arxescsi_pseudo_dma_write(addr, io);
176 addr += 256;
177 length -= 256;
178 }
179
180 if (!error)
181 while (length > 0) {
182 if (getb(io, 4) & STAT_INT)
183 break;
184
185 if (!(getb(io, 48) & CSTATUS_IRQ))
186 continue;
187
188 word = *addr | *(addr + 1) << 8;
189
190 putw(io, 16, word);
191 if (length > 1) {
192 addr += 2;
193 length -= 2;
194 } else {
195 addr += 1;
196 length -= 1;
197 }
198 }
199 }
200 else {
201 if (transfer && (transfer & 255)) {
202 while (length >= 256) {
203 if (getb(io, 4) & STAT_INT) {
204 error=1;
205 break;
206 }
207
208 if (!(getb(io, 48) & CSTATUS_IRQ))
209 continue;
210
211 insw(info->dmaarea, addr, 256 >> 1);
212 addr += 256;
213 length -= 256;
214 }
215 }
216
217 if (!(error))
218 while (length > 0) {
219 unsigned long word;
220
221 if (getb(io, 4) & STAT_INT)
222 break;
223
224 if (!(getb(io, 48) & CSTATUS_IRQ))
225 continue;
226
227 word = getw(io, 16);
228 *addr++ = word;
229 if (--length > 0) {
230 *addr++ = word >> 8;
231 length --;
232 }
233 }
234 }
235 }
236
237 /*
238 * Function: int arxescsi_dma_stop(host, SCpnt)
239 * Purpose : stops DMA/PIO
240 * Params : host - host
241 * SCpnt - command
242 */
243 static void arxescsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
244 {
245 /*
246 * no DMA to stop
247 */
248 }
249
250 /*
251 * Function: int arxescsi_detect(Scsi_Host_Template * tpnt)
252 * Purpose : initialises ARXE SCSI driver
253 * Params : tpnt - template for this SCSI adapter
254 * Returns : >0 if host found, 0 otherwise.
255 */
256 int arxescsi_detect(Scsi_Host_Template *tpnt)
257 {
258 static const card_ids arxescsi_cids[] = { ARXESCSI_LIST, { 0xffff, 0xffff} };
259 int count = 0;
260 struct Scsi_Host *host;
261
262 tpnt->proc_name = "arxescsi";
263 memset(ecs, 0, sizeof (ecs));
264
265 ecard_startfind();
266
267 while (1) {
268 ARXEScsi_Info *info;
269
270 ecs[count] = ecard_find(0, arxescsi_cids);
271 if (!ecs[count])
272 break;
273
274 ecard_claim(ecs[count]);
275
276 host = scsi_register(tpnt, sizeof (ARXEScsi_Info));
277 if (!host) {
278 ecard_release(ecs[count]);
279 break;
280 }
281
282 host->io_port = ecard_address(ecs[count], ECARD_MEMC, 0) + 0x0800;
283 host->irq = NO_IRQ;
284 host->dma_channel = NO_DMA;
285 host->can_queue = 0; /* no command queueing */
286 info = (ARXEScsi_Info *)host->hostdata;
287
288 info->info.scsi.io_port = host->io_port;
289 info->info.scsi.irq = host->irq;
290 info->info.scsi.io_shift = 3;
291 info->info.ifcfg.clockrate = ARXESCSI_XTALFREQ;
292 info->info.ifcfg.select_timeout = 255;
293 info->info.ifcfg.asyncperiod = ARXESCSI_ASYNC_PERIOD;
294 info->info.ifcfg.sync_max_depth = ARXESCSI_SYNC_DEPTH;
295 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
296 info->info.ifcfg.disconnect_ok = 0;
297 info->info.ifcfg.wide_max_size = 0;
298 info->info.dma.setup = arxescsi_dma_setup;
299 info->info.dma.pseudo = arxescsi_dma_pseudo;
300 info->info.dma.stop = arxescsi_dma_stop;
301 info->dmaarea = host->io_port + 128;
302 info->cstatus = host->io_port + 384;
303
304 ecs[count]->irqaddr = (unsigned char *)BUS_ADDR(host->io_port);
305 ecs[count]->irqmask = CSTATUS_IRQ;
306
307 request_region(host->io_port , 120, "arxescsi-fas");
308 request_region(host->io_port + 128, 384, "arxescsi-dma");
309
310 printk("scsi%d: Has no interrupts - using polling mode\n",
311 host->host_no);
312
313 fas216_init(host);
314 ++count;
315 }
316 return count;
317 }
318
319 /*
320 * Function: int arxescsi_release(struct Scsi_Host * host)
321 * Purpose : releases all resources used by this adapter
322 * Params : host - driver host structure to return info for.
323 * Returns : nothing
324 */
325 int arxescsi_release(struct Scsi_Host *host)
326 {
327 int i;
328
329 fas216_release(host);
330
331 release_region(host->io_port, 120);
332 release_region(host->io_port + 128, 384);
333
334 for (i = 0; i < MAX_ECARDS; i++)
335 if (ecs[i] && host->io_port == (ecard_address(ecs[i], ECARD_MEMC, 0) + 0x0800))
336 ecard_release(ecs[i]);
337 return 0;
338 }
339
340 /*
341 * Function: const char *arxescsi_info(struct Scsi_Host * host)
342 * Purpose : returns a descriptive string about this interface,
343 * Params : host - driver host structure to return info for.
344 * Returns : pointer to a static buffer containing null terminated string.
345 */
346 const char *arxescsi_info(struct Scsi_Host *host)
347 {
348 ARXEScsi_Info *info = (ARXEScsi_Info *)host->hostdata;
349 static char string[100], *p;
350
351 p = string;
352 p += sprintf(p, "%s ", host->hostt->name);
353 p += fas216_info(&info->info, p);
354 p += sprintf(p, "v%d.%d.%d", VER_MAJOR, VER_MINOR, VER_PATCH);
355
356 return string;
357 }
358
359 /*
360 * Function: int arxescsi_proc_info(char *buffer, char **start, off_t offset,
361 * int length, int host_no, int inout)
362 * Purpose : Return information about the driver to a user process accessing
363 * the /proc filesystem.
364 * Params : buffer - a buffer to write information to
365 * start - a pointer into this buffer set by this routine to the start
366 * of the required information.
367 * offset - offset into information that we have read upto.
368 * length - length of buffer
369 * host_no - host number to return information for
370 * inout - 0 for reading, 1 for writing.
371 * Returns : length of data written to buffer.
372 */
373 int arxescsi_proc_info(char *buffer, char **start, off_t offset,
374 int length, int host_no, int inout)
375 {
376 int pos, begin;
377 struct Scsi_Host *host = scsi_hostlist;
378 ARXEScsi_Info *info;
379 Scsi_Device *scd;
380
381 while (host) {
382 if (host->host_no == host_no)
383 break;
384 host = host->next;
385 }
386 if (!host)
387 return 0;
388
389 info = (ARXEScsi_Info *)host->hostdata;
390 if (inout == 1)
391 return -EINVAL;
392
393 begin = 0;
394 pos = sprintf(buffer,
395 "ARXE 16-bit SCSI driver version %d.%d.%d\n",
396 VER_MAJOR, VER_MINOR, VER_PATCH);
397 pos += fas216_print_host(&info->info, buffer + pos);
398 pos += fas216_print_stats(&info->info, buffer + pos);
399
400 pos += sprintf (buffer+pos, "\nAttached devices:\n");
401
402 for (scd = host->host_queue; scd; scd = scd->next) {
403 pos += fas216_print_device(&info->info, scd, buffer + pos);
404
405 if (pos + begin < offset) {
406 begin += pos;
407 pos = 0;
408 }
409 if (pos + begin > offset + length)
410 break;
411 }
412
413 *start = buffer + (offset - begin);
414 pos -= offset - begin;
415 if (pos > length)
416 pos = length;
417
418 return pos;
419 }
420
421 static Scsi_Host_Template arxescsi_template = ARXEScsi;
422
423 static int __init init_arxe_scsi_driver(void)
424 {
425 arxescsi_template.module = THIS_MODULE;
426 scsi_register_module(MODULE_SCSI_HA, &arxescsi_template);
427 if (arxescsi_template.present)
428 return 0;
429
430 scsi_unregister_module(MODULE_SCSI_HA, &arxescsi_template);
431 return -ENODEV;
432 }
433
434 static void __exit exit_arxe_scsi_driver(void)
435 {
436 scsi_unregister_module(MODULE_SCSI_HA, &arxescsi_template);
437 }
438
439 module_init(init_arxe_scsi_driver);
440 module_exit(exit_arxe_scsi_driver);
441
442 MODULE_LICENSE("GPL");
443