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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / scsi / arm / arxescsi.c
blob5914141207542d538cf968ce18953d7682ebc337
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/scsi/arm/arxescsi.c
4 *
5 * Copyright (C) 1997-2000 Russell King, Stefan Hanske
6 *
7 * This driver is based on experimentation. Hence, it may have made
8 * assumptions about the particular card that I have available, and
9 * may not be reliable!
10 *
11 * Changelog:
12 * 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c
13 * 22-01-1998 RMK 0.0.1 Updated to 2.1.80
14 * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.
15 * 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card
16 * enabled writing
17 * 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing
18 * (arxescsi_pseudo_dma_write)
19 * 02-04-2000 RMK 0.1.1 Updated for new error handling code.
20 * 22-10-2000 SH Updated for new registering scheme.
21 */
22 #include <linux/module.h>
23 #include <linux/blkdev.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/ioport.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 static int
225 arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
226 {
227 struct arxescsi_info *info;
228 info = (struct arxescsi_info *)host->hostdata;
229
230 seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
231 fas216_print_host(&info->info, m);
232 fas216_print_stats(&info->info, m);
233 fas216_print_devices(&info->info, m);
234 return 0;
235 }
236
237 static struct scsi_host_template arxescsi_template = {
238 .show_info = arxescsi_show_info,
239 .name = "ARXE SCSI card",
240 .info = arxescsi_info,
241 .queuecommand = fas216_noqueue_command,
242 .eh_host_reset_handler = fas216_eh_host_reset,
243 .eh_bus_reset_handler = fas216_eh_bus_reset,
244 .eh_device_reset_handler = fas216_eh_device_reset,
245 .eh_abort_handler = fas216_eh_abort,
246 .can_queue = 0,
247 .this_id = 7,
248 .sg_tablesize = SG_ALL,
249 .dma_boundary = PAGE_SIZE - 1,
250 .proc_name = "arxescsi",
251 };
252
253 static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
254 {
255 struct Scsi_Host *host;
256 struct arxescsi_info *info;
257 void __iomem *base;
258 int ret;
259
260 ret = ecard_request_resources(ec);
261 if (ret)
262 goto out;
263
264 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
265 if (!base) {
266 ret = -ENOMEM;
267 goto out_region;
268 }
269
270 host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
271 if (!host) {
272 ret = -ENOMEM;
273 goto out_region;
274 }
275
276 info = (struct arxescsi_info *)host->hostdata;
277 info->ec = ec;
278 info->base = base;
279
280 info->info.scsi.io_base = base + 0x2000;
281 info->info.scsi.irq = 0;
282 info->info.scsi.dma = NO_DMA;
283 info->info.scsi.io_shift = 5;
284 info->info.ifcfg.clockrate = 24; /* MHz */
285 info->info.ifcfg.select_timeout = 255;
286 info->info.ifcfg.asyncperiod = 200; /* ns */
287 info->info.ifcfg.sync_max_depth = 0;
288 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
289 info->info.ifcfg.disconnect_ok = 0;
290 info->info.ifcfg.wide_max_size = 0;
291 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
292 info->info.dma.setup = arxescsi_dma_setup;
293 info->info.dma.pseudo = arxescsi_dma_pseudo;
294 info->info.dma.stop = arxescsi_dma_stop;
295
296 ec->irqaddr = base;
297 ec->irqmask = CSTATUS_IRQ;
298
299 ret = fas216_init(host);
300 if (ret)
301 goto out_unregister;
302
303 ret = fas216_add(host, &ec->dev);
304 if (ret == 0)
305 goto out;
306
307 fas216_release(host);
308 out_unregister:
309 scsi_host_put(host);
310 out_region:
311 ecard_release_resources(ec);
312 out:
313 return ret;
314 }
315
316 static void arxescsi_remove(struct expansion_card *ec)
317 {
318 struct Scsi_Host *host = ecard_get_drvdata(ec);
319
320 ecard_set_drvdata(ec, NULL);
321 fas216_remove(host);
322
323 fas216_release(host);
324 scsi_host_put(host);
325 ecard_release_resources(ec);
326 }
327
328 static const struct ecard_id arxescsi_cids[] = {
329 { MANU_ARXE, PROD_ARXE_SCSI },
330 { 0xffff, 0xffff },
331 };
332
333 static struct ecard_driver arxescsi_driver = {
334 .probe = arxescsi_probe,
335 .remove = arxescsi_remove,
336 .id_table = arxescsi_cids,
337 .drv = {
338 .name = "arxescsi",
339 },
340 };
341
342 static int __init init_arxe_scsi_driver(void)
343 {
344 return ecard_register_driver(&arxescsi_driver);
345 }
346
347 static void __exit exit_arxe_scsi_driver(void)
348 {
349 ecard_remove_driver(&arxescsi_driver);
350 }
351
352 module_init(init_arxe_scsi_driver);
353 module_exit(exit_arxe_scsi_driver);
354
355 MODULE_AUTHOR("Stefan Hanske");
356 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
357 MODULE_LICENSE("GPL");
358
Linux with added FPC-III support