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atari_scsi: Allow can_queue to be increased for Falcon
[linux-2.6-block.git] / drivers / scsi / mac_scsi.c
CommitLineData
1da177e4
LT		 1/*
2 * Generic Macintosh NCR5380 driver
3 *
4 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
5 *
6 * derived in part from:
7 */
8/*
9 * Generic Generic NCR5380 driver
10 *
11 * Copyright 1995, Russell King
1da177e4
LT		 12 */
13
1da177e4 14#include <linux/types.h>
1da177e4 15#include <linux/module.h>
1da177e4
LT		 16#include <linux/ioport.h>
17#include <linux/init.h>
18#include <linux/blkdev.h>
19#include <linux/interrupt.h>
cbad48de 20#include <linux/platform_device.h>
1da177e4 21
cbad48de 22#include <asm/hwtest.h>
1da177e4 23#include <asm/io.h>
1da177e4 24#include <asm/macints.h>
cbad48de 25#include <asm/setup.h>
1da177e4 26
1da177e4 27#include <scsi/scsi_host.h>
92de3831
FT		 28
29/* Definitions for the core NCR5380 driver. */
e744fdea 30
cbad48de 31#define NCR5380_implementation_fields unsigned char *pdma_base
92de3831 32
54d8fe44
FT		 33#define NCR5380_read(reg) macscsi_read(instance, reg)
34#define NCR5380_write(reg, value) macscsi_write(instance, reg, value)
92de3831 35
7e9ec8d9
FT		 36#define NCR5380_dma_xfer_len(instance, cmd, phase) \
37 macscsi_dma_xfer_len(instance, cmd)
6c4b88ca
FT		 38#define NCR5380_dma_recv_setup macscsi_pread
39#define NCR5380_dma_send_setup macscsi_pwrite
8053b0ee 40#define NCR5380_dma_residual(instance) (0)
92de3831
FT		 41
42#define NCR5380_intr macscsi_intr
43#define NCR5380_queue_command macscsi_queue_command
44#define NCR5380_abort macscsi_abort
45#define NCR5380_bus_reset macscsi_bus_reset
46#define NCR5380_info macscsi_info
92de3831 47
1da177e4
LT		 48#include "NCR5380.h"
49
1da177e4 50static int setup_can_queue = -1;
6e9ae6d5 51module_param(setup_can_queue, int, 0);
1da177e4 52static int setup_cmd_per_lun = -1;
6e9ae6d5 53module_param(setup_cmd_per_lun, int, 0);
1da177e4 54static int setup_sg_tablesize = -1;
6e9ae6d5 55module_param(setup_sg_tablesize, int, 0);
1da177e4 56static int setup_use_pdma = -1;
6e9ae6d5 57module_param(setup_use_pdma, int, 0);
1da177e4 58static int setup_hostid = -1;
6e9ae6d5 59module_param(setup_hostid, int, 0);
9c3f0e2b
FT		 60static int setup_toshiba_delay = -1;
61module_param(setup_toshiba_delay, int, 0);
1da177e4 62
1da177e4
LT		 63/*
64 * NCR 5380 register access functions
65 */
66
cbad48de 67static inline char macscsi_read(struct Scsi_Host *instance, int reg)
1da177e4 68{
cbad48de 69 return in_8(instance->base + (reg << 4));
1da177e4
LT		 70}
71
cbad48de 72static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value)
1da177e4 73{
cbad48de 74 out_8(instance->base + (reg << 4), value);
1da177e4 75}
1da177e4 76
6e9ae6d5
FT		 77#ifndef MODULE
78static int __init mac_scsi_setup(char *str)
79{
9c3f0e2b 80 int ints[8];
6e9ae6d5
FT		 81
82 (void)get_options(str, ARRAY_SIZE(ints), ints);
83
9c3f0e2b
FT		 84 if (ints[0] < 1) {
85 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
6e9ae6d5 86 return 0;
1da177e4 87 }
6e9ae6d5
FT		 88 if (ints[0] >= 1)
89 setup_can_queue = ints[1];
90 if (ints[0] >= 2)
91 setup_cmd_per_lun = ints[2];
92 if (ints[0] >= 3)
93 setup_sg_tablesize = ints[3];
94 if (ints[0] >= 4)
95 setup_hostid = ints[4];
c4ec6f92 96 /* ints[5] (use_tagged_queuing) is ignored */
6e9ae6d5 97 if (ints[0] >= 6)
1da177e4 98 setup_use_pdma = ints[6];
9c3f0e2b
FT		 99 if (ints[0] >= 7)
100 setup_toshiba_delay = ints[7];
1da177e4
LT		 101 return 1;
102}
103
104__setup("mac5380=", mac_scsi_setup);
6e9ae6d5 105#endif /* !MODULE */
1da177e4 106
1da177e4
LT		 107/*
108 Pseudo-DMA: (Ove Edlund)
109 The code attempts to catch bus errors that occur if one for example
110 "trips over the cable".
111 XXX: Since bus errors in the PDMA routines never happen on my
112 computer, the bus error code is untested.
113 If the code works as intended, a bus error results in Pseudo-DMA
542cb459 114 being disabled, meaning that the driver switches to slow handshake.
1da177e4
LT		 115 If bus errors are NOT extremely rare, this has to be changed.
116*/
117
118#define CP_IO_TO_MEM(s,d,len) \
119__asm__ __volatile__ \
120 (" cmp.w #4,%2\n" \
121 " bls 8f\n" \
122 " move.w %1,%%d0\n" \
123 " neg.b %%d0\n" \
124 " and.w #3,%%d0\n" \
125 " sub.w %%d0,%2\n" \
126 " bra 2f\n" \
127 " 1: move.b (%0),(%1)+\n" \
128 " 2: dbf %%d0,1b\n" \
129 " move.w %2,%%d0\n" \
130 " lsr.w #5,%%d0\n" \
131 " bra 4f\n" \
132 " 3: move.l (%0),(%1)+\n" \
133 "31: move.l (%0),(%1)+\n" \
134 "32: move.l (%0),(%1)+\n" \
135 "33: move.l (%0),(%1)+\n" \
136 "34: move.l (%0),(%1)+\n" \
137 "35: move.l (%0),(%1)+\n" \
138 "36: move.l (%0),(%1)+\n" \
139 "37: move.l (%0),(%1)+\n" \
140 " 4: dbf %%d0,3b\n" \
141 " move.w %2,%%d0\n" \
142 " lsr.w #2,%%d0\n" \
143 " and.w #7,%%d0\n" \
144 " bra 6f\n" \
145 " 5: move.l (%0),(%1)+\n" \
146 " 6: dbf %%d0,5b\n" \
147 " and.w #3,%2\n" \
148 " bra 8f\n" \
149 " 7: move.b (%0),(%1)+\n" \
150 " 8: dbf %2,7b\n" \
151 " moveq.l #0, %2\n" \
152 " 9: \n" \
153 ".section .fixup,\"ax\"\n" \
154 " .even\n" \
155 "90: moveq.l #1, %2\n" \
156 " jra 9b\n" \
157 ".previous\n" \
158 ".section __ex_table,\"a\"\n" \
159 " .align 4\n" \
160 " .long 1b,90b\n" \
161 " .long 3b,90b\n" \
162 " .long 31b,90b\n" \
163 " .long 32b,90b\n" \
164 " .long 33b,90b\n" \
165 " .long 34b,90b\n" \
166 " .long 35b,90b\n" \
167 " .long 36b,90b\n" \
168 " .long 37b,90b\n" \
169 " .long 5b,90b\n" \
170 " .long 7b,90b\n" \
171 ".previous" \
172 : "=a"(s), "=a"(d), "=d"(len) \
173 : "0"(s), "1"(d), "2"(len) \
174 : "d0")
175
ffdede67
FT		 176static int macscsi_pread(struct Scsi_Host *instance,
177 unsigned char *dst, int len)
1da177e4 178{
cbad48de 179 struct NCR5380_hostdata *hostdata = shost_priv(instance);
ffdede67
FT		 180 unsigned char *d;
181 unsigned char *s;
182
cbad48de 183 s = hostdata->pdma_base + (INPUT_DATA_REG << 4);
ffdede67
FT		 184 d = dst;
185
186 /* These conditions are derived from MacOS */
187
188 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
189 !(NCR5380_read(STATUS_REG) & SR_REQ))
190 ;
191
192 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
193 (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
194 pr_err("Error in macscsi_pread\n");
195 return -1;
196 }
197
198 CP_IO_TO_MEM(s, d, len);
199
200 if (len != 0) {
201 pr_notice("Bus error in macscsi_pread\n");
202 return -1;
203 }
204
205 return 0;
1da177e4
LT		 206}
207
208
209#define CP_MEM_TO_IO(s,d,len) \
210__asm__ __volatile__ \
211 (" cmp.w #4,%2\n" \
212 " bls 8f\n" \
213 " move.w %0,%%d0\n" \
214 " neg.b %%d0\n" \
215 " and.w #3,%%d0\n" \
216 " sub.w %%d0,%2\n" \
217 " bra 2f\n" \
218 " 1: move.b (%0)+,(%1)\n" \
219 " 2: dbf %%d0,1b\n" \
220 " move.w %2,%%d0\n" \
221 " lsr.w #5,%%d0\n" \
222 " bra 4f\n" \
223 " 3: move.l (%0)+,(%1)\n" \
224 "31: move.l (%0)+,(%1)\n" \
225 "32: move.l (%0)+,(%1)\n" \
226 "33: move.l (%0)+,(%1)\n" \
227 "34: move.l (%0)+,(%1)\n" \
228 "35: move.l (%0)+,(%1)\n" \
229 "36: move.l (%0)+,(%1)\n" \
230 "37: move.l (%0)+,(%1)\n" \
231 " 4: dbf %%d0,3b\n" \
232 " move.w %2,%%d0\n" \
233 " lsr.w #2,%%d0\n" \
234 " and.w #7,%%d0\n" \
235 " bra 6f\n" \
236 " 5: move.l (%0)+,(%1)\n" \
237 " 6: dbf %%d0,5b\n" \
238 " and.w #3,%2\n" \
239 " bra 8f\n" \
240 " 7: move.b (%0)+,(%1)\n" \
241 " 8: dbf %2,7b\n" \
242 " moveq.l #0, %2\n" \
243 " 9: \n" \
244 ".section .fixup,\"ax\"\n" \
245 " .even\n" \
246 "90: moveq.l #1, %2\n" \
247 " jra 9b\n" \
248 ".previous\n" \
249 ".section __ex_table,\"a\"\n" \
250 " .align 4\n" \
251 " .long 1b,90b\n" \
252 " .long 3b,90b\n" \
253 " .long 31b,90b\n" \
254 " .long 32b,90b\n" \
255 " .long 33b,90b\n" \
256 " .long 34b,90b\n" \
257 " .long 35b,90b\n" \
258 " .long 36b,90b\n" \
259 " .long 37b,90b\n" \
260 " .long 5b,90b\n" \
261 " .long 7b,90b\n" \
262 ".previous" \
263 : "=a"(s), "=a"(d), "=d"(len) \
264 : "0"(s), "1"(d), "2"(len) \
265 : "d0")
266
ffdede67
FT		 267static int macscsi_pwrite(struct Scsi_Host *instance,
268 unsigned char *src, int len)
1da177e4 269{
cbad48de 270 struct NCR5380_hostdata *hostdata = shost_priv(instance);
ffdede67
FT		 271 unsigned char *s;
272 unsigned char *d;
1da177e4 273
ffdede67 274 s = src;
cbad48de 275 d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4);
ffdede67
FT		 276
277 /* These conditions are derived from MacOS */
278
279 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
280 (!(NCR5380_read(STATUS_REG) & SR_REQ) ||
281 (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
282 ;
283
284 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
285 pr_err("Error in macscsi_pwrite\n");
286 return -1;
287 }
288
289 CP_MEM_TO_IO(s, d, len);
290
291 if (len != 0) {
292 pr_notice("Bus error in macscsi_pwrite\n");
293 return -1;
294 }
295
296 return 0;
297}
1da177e4 298
7e9ec8d9
FT		 299static int macscsi_dma_xfer_len(struct Scsi_Host *instance,
300 struct scsi_cmnd *cmd)
301{
302 struct NCR5380_hostdata *hostdata = shost_priv(instance);
303
304 if (hostdata->flags & FLAG_NO_PSEUDO_DMA)
305 return 0;
306
307 return cmd->transfersize;
308}
309
1da177e4
LT		 310#include "NCR5380.c"
311
cbad48de
FT		 312#define DRV_MODULE_NAME "mac_scsi"
313#define PFX DRV_MODULE_NAME ": "
314
315static struct scsi_host_template mac_scsi_template = {
aa2e2cb1
FT		 316 .module = THIS_MODULE,
317 .proc_name = DRV_MODULE_NAME,
aa2e2cb1
FT		 318 .name = "Macintosh NCR5380 SCSI",
319 .info = macscsi_info,
320 .queuecommand = macscsi_queue_command,
321 .eh_abort_handler = macscsi_abort,
322 .eh_bus_reset_handler = macscsi_bus_reset,
323 .can_queue = 16,
324 .this_id = 7,
325 .sg_tablesize = SG_ALL,
326 .cmd_per_lun = 2,
327 .use_clustering = DISABLE_CLUSTERING,
32b26a10 328 .cmd_size = NCR5380_CMD_SIZE,
0a4e3612 329 .max_sectors = 128,
1da177e4
LT		 330};
331
cbad48de
FT		 332static int __init mac_scsi_probe(struct platform_device *pdev)
333{
334 struct Scsi_Host *instance;
335 int error;
336 int host_flags = 0;
337 struct resource *irq, *pio_mem, *pdma_mem = NULL;
338
339 pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
340 if (!pio_mem)
341 return -ENODEV;
342
cbad48de 343 pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
cbad48de
FT		 344
345 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
346
347 if (!hwreg_present((unsigned char *)pio_mem->start +
348 (STATUS_REG << 4))) {
349 pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
350 return -ENODEV;
351 }
352
353 if (setup_can_queue > 0)
354 mac_scsi_template.can_queue = setup_can_queue;
355 if (setup_cmd_per_lun > 0)
356 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
357 if (setup_sg_tablesize >= 0)
358 mac_scsi_template.sg_tablesize = setup_sg_tablesize;
359 if (setup_hostid >= 0)
360 mac_scsi_template.this_id = setup_hostid & 7;
cbad48de
FT		 361 if (setup_use_pdma < 0)
362 setup_use_pdma = 0;
363
364 instance = scsi_host_alloc(&mac_scsi_template,
365 sizeof(struct NCR5380_hostdata));
366 if (!instance)
367 return -ENOMEM;
368
369 instance->base = pio_mem->start;
370 if (irq)
371 instance->irq = irq->start;
372 else
373 instance->irq = NO_IRQ;
374
375 if (pdma_mem && setup_use_pdma) {
376 struct NCR5380_hostdata *hostdata = shost_priv(instance);
377
378 hostdata->pdma_base = (unsigned char *)pdma_mem->start;
379 } else
380 host_flags |= FLAG_NO_PSEUDO_DMA;
381
9c3f0e2b 382 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
ca513fc9 383
8053b0ee 384 error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
0ad0eff9
FT		 385 if (error)
386 goto fail_init;
cbad48de
FT		 387
388 if (instance->irq != NO_IRQ) {
389 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
390 "NCR5380", instance);
391 if (error)
392 goto fail_irq;
393 }
394
9c3f0e2b
FT		 395 NCR5380_maybe_reset_bus(instance);
396
cbad48de
FT		 397 error = scsi_add_host(instance, NULL);
398 if (error)
399 goto fail_host;
400
401 platform_set_drvdata(pdev, instance);
402
403 scsi_scan_host(instance);
404 return 0;
405
406fail_host:
407 if (instance->irq != NO_IRQ)
408 free_irq(instance->irq, instance);
409fail_irq:
410 NCR5380_exit(instance);
0ad0eff9 411fail_init:
cbad48de
FT		 412 scsi_host_put(instance);
413 return error;
414}
415
416static int __exit mac_scsi_remove(struct platform_device *pdev)
417{
418 struct Scsi_Host *instance = platform_get_drvdata(pdev);
419
420 scsi_remove_host(instance);
421 if (instance->irq != NO_IRQ)
422 free_irq(instance->irq, instance);
423 NCR5380_exit(instance);
424 scsi_host_put(instance);
425 return 0;
426}
427
428static struct platform_driver mac_scsi_driver = {
429 .remove = __exit_p(mac_scsi_remove),
430 .driver = {
431 .name = DRV_MODULE_NAME,
cbad48de
FT		 432 },
433};
1da177e4 434
cbad48de 435module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
6e9ae6d5 436
cbad48de 437MODULE_ALIAS("platform:" DRV_MODULE_NAME);
6e9ae6d5 438MODULE_LICENSE("GPL");
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