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/scsi.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_eh.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_tcq.h>
44 #include "fas216.h"
45
46 struct arxescsi_info {
47 FAS216_Info info;
48 struct expansion_card *ec;
49 void __iomem *base;
50 };
51
52 #define DMADATA_OFFSET (0x200)
53
54 #define DMASTAT_OFFSET (0x600)
55 #define DMASTAT_DRQ (1 << 0)
56
57 #define CSTATUS_IRQ (1 << 0)
58
59 #define VERSION "1.10 (23/01/2003 2.5.57)"
60
61 /*
62 * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
63 * Purpose : initialises DMA/PIO
64 * Params : host - host
65 * SCpnt - command
66 * direction - DMA on to/off of card
67 * min_type - minimum DMA support that we must have for this transfer
68 * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
69 */
70 static fasdmatype_t
arxescsi_dma_setup(struct Scsi_Host * host,struct scsi_pointer * SCp,fasdmadir_t direction,fasdmatype_t min_type)71 arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
72 fasdmadir_t direction, fasdmatype_t min_type)
73 {
74 /*
75 * We don't do real DMA
76 */
77 return fasdma_pseudo;
78 }
79
arxescsi_pseudo_dma_write(unsigned char * addr,void __iomem * base)80 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
81 {
82 __asm__ __volatile__(
83 " stmdb sp!, {r0-r12}\n"
84 " mov r3, %0\n"
85 " mov r1, %1\n"
86 " add r2, r1, #512\n"
87 " mov r4, #256\n"
88 ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"
89 " mov r5, r6, lsl #16\n"
90 " mov r7, r8, lsl #16\n"
91 ".loop_2: ldrb r0, [r1, #1536]\n"
92 " tst r0, #1\n"
93 " beq .loop_2\n"
94 " stmia r2, {r5-r8}\n\t"
95 " mov r9, r10, lsl #16\n"
96 " mov r11, r12, lsl #16\n"
97 ".loop_3: ldrb r0, [r1, #1536]\n"
98 " tst r0, #1\n"
99 " beq .loop_3\n"
100 " stmia r2, {r9-r12}\n"
101 " subs r4, r4, #16\n"
102 " bne .loop_1\n"
103 " ldmia sp!, {r0-r12}\n"
104 :
105 : "r" (addr), "r" (base));
106 }
107
108 /*
109 * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
110 * Purpose : handles pseudo DMA
111 * Params : host - host
112 * SCpnt - command
113 * direction - DMA on to/off of card
114 * transfer - minimum number of bytes we expect to transfer
115 */
116 static void
arxescsi_dma_pseudo(struct Scsi_Host * host,struct scsi_pointer * SCp,fasdmadir_t direction,int transfer)117 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
118 fasdmadir_t direction, int transfer)
119 {
120 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
121 unsigned int length, error = 0;
122 void __iomem *base = info->info.scsi.io_base;
123 unsigned char *addr;
124
125 length = SCp->this_residual;
126 addr = SCp->ptr;
127
128 if (direction == DMA_OUT) {
129 unsigned int word;
130 while (length > 256) {
131 if (readb(base + 0x80) & STAT_INT) {
132 error = 1;
133 break;
134 }
135 arxescsi_pseudo_dma_write(addr, base);
136 addr += 256;
137 length -= 256;
138 }
139
140 if (!error)
141 while (length > 0) {
142 if (readb(base + 0x80) & STAT_INT)
143 break;
144
145 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
146 continue;
147
148 word = *addr | *(addr + 1) << 8;
149
150 writew(word, base + DMADATA_OFFSET);
151 if (length > 1) {
152 addr += 2;
153 length -= 2;
154 } else {
155 addr += 1;
156 length -= 1;
157 }
158 }
159 }
160 else {
161 if (transfer && (transfer & 255)) {
162 while (length >= 256) {
163 if (readb(base + 0x80) & STAT_INT) {
164 error = 1;
165 break;
166 }
167
168 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
169 continue;
170
171 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
172 addr += 256;
173 length -= 256;
174 }
175 }
176
177 if (!(error))
178 while (length > 0) {
179 unsigned long word;
180
181 if (readb(base + 0x80) & STAT_INT)
182 break;
183
184 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
185 continue;
186
187 word = readw(base + DMADATA_OFFSET);
188 *addr++ = word;
189 if (--length > 0) {
190 *addr++ = word >> 8;
191 length --;
192 }
193 }
194 }
195 }
196
197 /*
198 * Function: int arxescsi_dma_stop(host, SCpnt)
199 * Purpose : stops DMA/PIO
200 * Params : host - host
201 * SCpnt - command
202 */
arxescsi_dma_stop(struct Scsi_Host * host,struct scsi_pointer * SCp)203 static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
204 {
205 /*
206 * no DMA to stop
207 */
208 }
209
210 /*
211 * Function: const char *arxescsi_info(struct Scsi_Host * host)
212 * Purpose : returns a descriptive string about this interface,
213 * Params : host - driver host structure to return info for.
214 * Returns : pointer to a static buffer containing null terminated string.
215 */
arxescsi_info(struct Scsi_Host * host)216 static const char *arxescsi_info(struct Scsi_Host *host)
217 {
218 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
219 static char string[150];
220
221 sprintf(string, "%s (%s) in slot %d v%s",
222 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
223 VERSION);
224
225 return string;
226 }
227
228 static int
arxescsi_show_info(struct seq_file * m,struct Scsi_Host * host)229 arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
230 {
231 struct arxescsi_info *info;
232 info = (struct arxescsi_info *)host->hostdata;
233
234 seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
235 fas216_print_host(&info->info, m);
236 fas216_print_stats(&info->info, m);
237 fas216_print_devices(&info->info, m);
238 return 0;
239 }
240
241 static const struct scsi_host_template arxescsi_template = {
242 .show_info = arxescsi_show_info,
243 .name = "ARXE SCSI card",
244 .info = arxescsi_info,
245 .queuecommand = fas216_noqueue_command,
246 .eh_host_reset_handler = fas216_eh_host_reset,
247 .eh_bus_reset_handler = fas216_eh_bus_reset,
248 .eh_device_reset_handler = fas216_eh_device_reset,
249 .eh_abort_handler = fas216_eh_abort,
250 .cmd_size = sizeof(struct fas216_cmd_priv),
251 .can_queue = 0,
252 .this_id = 7,
253 .sg_tablesize = SG_ALL,
254 .dma_boundary = PAGE_SIZE - 1,
255 .proc_name = "arxescsi",
256 };
257
arxescsi_probe(struct expansion_card * ec,const struct ecard_id * id)258 static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
259 {
260 struct Scsi_Host *host;
261 struct arxescsi_info *info;
262 void __iomem *base;
263 int ret;
264
265 ret = ecard_request_resources(ec);
266 if (ret)
267 goto out;
268
269 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
270 if (!base) {
271 ret = -ENOMEM;
272 goto out_region;
273 }
274
275 host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
276 if (!host) {
277 ret = -ENOMEM;
278 goto out_region;
279 }
280
281 info = (struct arxescsi_info *)host->hostdata;
282 info->ec = ec;
283 info->base = base;
284
285 info->info.scsi.io_base = base + 0x2000;
286 info->info.scsi.irq = 0;
287 info->info.scsi.dma = NO_DMA;
288 info->info.scsi.io_shift = 5;
289 info->info.ifcfg.clockrate = 24; /* MHz */
290 info->info.ifcfg.select_timeout = 255;
291 info->info.ifcfg.asyncperiod = 200; /* ns */
292 info->info.ifcfg.sync_max_depth = 0;
293 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
294 info->info.ifcfg.disconnect_ok = 0;
295 info->info.ifcfg.wide_max_size = 0;
296 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
297 info->info.dma.setup = arxescsi_dma_setup;
298 info->info.dma.pseudo = arxescsi_dma_pseudo;
299 info->info.dma.stop = arxescsi_dma_stop;
300
301 ec->irqaddr = base;
302 ec->irqmask = CSTATUS_IRQ;
303
304 ret = fas216_init(host);
305 if (ret)
306 goto out_unregister;
307
308 ret = fas216_add(host, &ec->dev);
309 if (ret == 0)
310 goto out;
311
312 fas216_release(host);
313 out_unregister:
314 scsi_host_put(host);
315 out_region:
316 ecard_release_resources(ec);
317 out:
318 return ret;
319 }
320
arxescsi_remove(struct expansion_card * ec)321 static void arxescsi_remove(struct expansion_card *ec)
322 {
323 struct Scsi_Host *host = ecard_get_drvdata(ec);
324
325 ecard_set_drvdata(ec, NULL);
326 fas216_remove(host);
327
328 fas216_release(host);
329 scsi_host_put(host);
330 ecard_release_resources(ec);
331 }
332
333 static const struct ecard_id arxescsi_cids[] = {
334 { MANU_ARXE, PROD_ARXE_SCSI },
335 { 0xffff, 0xffff },
336 };
337
338 static struct ecard_driver arxescsi_driver = {
339 .probe = arxescsi_probe,
340 .remove = arxescsi_remove,
341 .id_table = arxescsi_cids,
342 .drv = {
343 .name = "arxescsi",
344 },
345 };
346
init_arxe_scsi_driver(void)347 static int __init init_arxe_scsi_driver(void)
348 {
349 return ecard_register_driver(&arxescsi_driver);
350 }
351
exit_arxe_scsi_driver(void)352 static void __exit exit_arxe_scsi_driver(void)
353 {
354 ecard_remove_driver(&arxescsi_driver);
355 }
356
357 module_init(init_arxe_scsi_driver);
358 module_exit(exit_arxe_scsi_driver);
359
360 MODULE_AUTHOR("Stefan Hanske");
361 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
362 MODULE_LICENSE("GPL");
363
364