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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / scsi / arm / arxescsi.c
bloba750aa72b8ef27249a8925e49feee8cf5baf1811
1 /*
2 * linux/drivers/scsi/arm/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/proc_fs.h>
27 #include <linux/unistd.h>
28 #include <linux/stat.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/interrupt.h>
32
33 #include <asm/dma.h>
34 #include <asm/io.h>
35 #include <asm/ecard.h>
36
37 #include "../scsi.h"
38 #include <scsi/scsi_host.h>
39 #include "fas216.h"
40
41 struct arxescsi_info {
42 FAS216_Info info;
43 struct expansion_card *ec;
44 void __iomem *base;
45 };
46
47 #define DMADATA_OFFSET (0x200)
48
49 #define DMASTAT_OFFSET (0x600)
50 #define DMASTAT_DRQ (1 << 0)
51
52 #define CSTATUS_IRQ (1 << 0)
53
54 #define VERSION "1.10 (23/01/2003 2.5.57)"
55
56 /*
57 * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
58 * Purpose : initialises DMA/PIO
59 * Params : host - host
60 * SCpnt - command
61 * direction - DMA on to/off of card
62 * min_type - minimum DMA support that we must have for this transfer
63 * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
64 */
65 static fasdmatype_t
66 arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
67 fasdmadir_t direction, fasdmatype_t min_type)
68 {
69 /*
70 * We don't do real DMA
71 */
72 return fasdma_pseudo;
73 }
74
75 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
76 {
77 __asm__ __volatile__(
78 " stmdb sp!, {r0-r12}\n"
79 " mov r3, %0\n"
80 " mov r1, %1\n"
81 " add r2, r1, #512\n"
82 " mov r4, #256\n"
83 ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"
84 " mov r5, r6, lsl #16\n"
85 " mov r7, r8, lsl #16\n"
86 ".loop_2: ldrb r0, [r1, #1536]\n"
87 " tst r0, #1\n"
88 " beq .loop_2\n"
89 " stmia r2, {r5-r8}\n\t"
90 " mov r9, r10, lsl #16\n"
91 " mov r11, r12, lsl #16\n"
92 ".loop_3: ldrb r0, [r1, #1536]\n"
93 " tst r0, #1\n"
94 " beq .loop_3\n"
95 " stmia r2, {r9-r12}\n"
96 " subs r4, r4, #16\n"
97 " bne .loop_1\n"
98 " ldmia sp!, {r0-r12}\n"
99 :
100 : "r" (addr), "r" (base));
101 }
102
103 /*
104 * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
105 * Purpose : handles pseudo DMA
106 * Params : host - host
107 * SCpnt - command
108 * direction - DMA on to/off of card
109 * transfer - minimum number of bytes we expect to transfer
110 */
111 static void
112 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
113 fasdmadir_t direction, int transfer)
114 {
115 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
116 unsigned int length, error = 0;
117 void __iomem *base = info->info.scsi.io_base;
118 unsigned char *addr;
119
120 length = SCp->this_residual;
121 addr = SCp->ptr;
122
123 if (direction == DMA_OUT) {
124 unsigned int word;
125 while (length > 256) {
126 if (readb(base + 0x80) & STAT_INT) {
127 error = 1;
128 break;
129 }
130 arxescsi_pseudo_dma_write(addr, base);
131 addr += 256;
132 length -= 256;
133 }
134
135 if (!error)
136 while (length > 0) {
137 if (readb(base + 0x80) & STAT_INT)
138 break;
139
140 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
141 continue;
142
143 word = *addr | *(addr + 1) << 8;
144
145 writew(word, base + DMADATA_OFFSET);
146 if (length > 1) {
147 addr += 2;
148 length -= 2;
149 } else {
150 addr += 1;
151 length -= 1;
152 }
153 }
154 }
155 else {
156 if (transfer && (transfer & 255)) {
157 while (length >= 256) {
158 if (readb(base + 0x80) & STAT_INT) {
159 error = 1;
160 break;
161 }
162
163 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
164 continue;
165
166 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
167 addr += 256;
168 length -= 256;
169 }
170 }
171
172 if (!(error))
173 while (length > 0) {
174 unsigned long word;
175
176 if (readb(base + 0x80) & STAT_INT)
177 break;
178
179 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
180 continue;
181
182 word = readw(base + DMADATA_OFFSET);
183 *addr++ = word;
184 if (--length > 0) {
185 *addr++ = word >> 8;
186 length --;
187 }
188 }
189 }
190 }
191
192 /*
193 * Function: int arxescsi_dma_stop(host, SCpnt)
194 * Purpose : stops DMA/PIO
195 * Params : host - host
196 * SCpnt - command
197 */
198 static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
199 {
200 /*
201 * no DMA to stop
202 */
203 }
204
205 /*
206 * Function: const char *arxescsi_info(struct Scsi_Host * host)
207 * Purpose : returns a descriptive string about this interface,
208 * Params : host - driver host structure to return info for.
209 * Returns : pointer to a static buffer containing null terminated string.
210 */
211 static const char *arxescsi_info(struct Scsi_Host *host)
212 {
213 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
214 static char string[150];
215
216 sprintf(string, "%s (%s) in slot %d v%s",
217 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
218 VERSION);
219
220 return string;
221 }
222
223 /*
224 * Function: int arxescsi_proc_info(char *buffer, char **start, off_t offset,
225 * int length, int host_no, int inout)
226 * Purpose : Return information about the driver to a user process accessing
227 * the /proc filesystem.
228 * Params : buffer - a buffer to write information to
229 * start - a pointer into this buffer set by this routine to the start
230 * of the required information.
231 * offset - offset into information that we have read up to.
232 * length - length of buffer
233 * host_no - host number to return information for
234 * inout - 0 for reading, 1 for writing.
235 * Returns : length of data written to buffer.
236 */
237 static int
238 arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length,
239 int inout)
240 {
241 struct arxescsi_info *info;
242 char *p = buffer;
243 int pos;
244
245 info = (struct arxescsi_info *)host->hostdata;
246 if (inout == 1)
247 return -EINVAL;
248
249 p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION);
250 p += fas216_print_host(&info->info, p);
251 p += fas216_print_stats(&info->info, p);
252 p += fas216_print_devices(&info->info, p);
253
254 *start = buffer + offset;
255 pos = p - buffer - offset;
256 if (pos > length)
257 pos = length;
258
259 return pos;
260 }
261
262 static struct scsi_host_template arxescsi_template = {
263 .proc_info = arxescsi_proc_info,
264 .name = "ARXE SCSI card",
265 .info = arxescsi_info,
266 .queuecommand = fas216_noqueue_command,
267 .eh_host_reset_handler = fas216_eh_host_reset,
268 .eh_bus_reset_handler = fas216_eh_bus_reset,
269 .eh_device_reset_handler = fas216_eh_device_reset,
270 .eh_abort_handler = fas216_eh_abort,
271 .can_queue = 0,
272 .this_id = 7,
273 .sg_tablesize = SG_ALL,
274 .cmd_per_lun = 1,
275 .use_clustering = DISABLE_CLUSTERING,
276 .proc_name = "arxescsi",
277 };
278
279 static int __devinit
280 arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
281 {
282 struct Scsi_Host *host;
283 struct arxescsi_info *info;
284 void __iomem *base;
285 int ret;
286
287 ret = ecard_request_resources(ec);
288 if (ret)
289 goto out;
290
291 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
292 if (!base) {
293 ret = -ENOMEM;
294 goto out_region;
295 }
296
297 host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
298 if (!host) {
299 ret = -ENOMEM;
300 goto out_region;
301 }
302
303 info = (struct arxescsi_info *)host->hostdata;
304 info->ec = ec;
305 info->base = base;
306
307 info->info.scsi.io_base = base + 0x2000;
308 info->info.scsi.irq = NO_IRQ;
309 info->info.scsi.dma = NO_DMA;
310 info->info.scsi.io_shift = 5;
311 info->info.ifcfg.clockrate = 24; /* MHz */
312 info->info.ifcfg.select_timeout = 255;
313 info->info.ifcfg.asyncperiod = 200; /* ns */
314 info->info.ifcfg.sync_max_depth = 0;
315 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
316 info->info.ifcfg.disconnect_ok = 0;
317 info->info.ifcfg.wide_max_size = 0;
318 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
319 info->info.dma.setup = arxescsi_dma_setup;
320 info->info.dma.pseudo = arxescsi_dma_pseudo;
321 info->info.dma.stop = arxescsi_dma_stop;
322
323 ec->irqaddr = base;
324 ec->irqmask = CSTATUS_IRQ;
325
326 ret = fas216_init(host);
327 if (ret)
328 goto out_unregister;
329
330 ret = fas216_add(host, &ec->dev);
331 if (ret == 0)
332 goto out;
333
334 fas216_release(host);
335 out_unregister:
336 scsi_host_put(host);
337 out_region:
338 ecard_release_resources(ec);
339 out:
340 return ret;
341 }
342
343 static void __devexit arxescsi_remove(struct expansion_card *ec)
344 {
345 struct Scsi_Host *host = ecard_get_drvdata(ec);
346
347 ecard_set_drvdata(ec, NULL);
348 fas216_remove(host);
349
350 fas216_release(host);
351 scsi_host_put(host);
352 ecard_release_resources(ec);
353 }
354
355 static const struct ecard_id arxescsi_cids[] = {
356 { MANU_ARXE, PROD_ARXE_SCSI },
357 { 0xffff, 0xffff },
358 };
359
360 static struct ecard_driver arxescsi_driver = {
361 .probe = arxescsi_probe,
362 .remove = __devexit_p(arxescsi_remove),
363 .id_table = arxescsi_cids,
364 .drv = {
365 .name = "arxescsi",
366 },
367 };
368
369 static int __init init_arxe_scsi_driver(void)
370 {
371 return ecard_register_driver(&arxescsi_driver);
372 }
373
374 static void __exit exit_arxe_scsi_driver(void)
375 {
376 ecard_remove_driver(&arxescsi_driver);
377 }
378
379 module_init(init_arxe_scsi_driver);
380 module_exit(exit_arxe_scsi_driver);
381
382 MODULE_AUTHOR("Stefan Hanske");
383 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
384 MODULE_LICENSE("GPL");
385