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
12 */
13
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18 #include <linux/blkdev.h>
19 #include <linux/interrupt.h>
20 #include <linux/platform_device.h>
21
22 #include <asm/hwtest.h>
23 #include <asm/io.h>
24 #include <asm/macints.h>
25 #include <asm/setup.h>
26
27 #include <scsi/scsi_host.h>
28
29 /* Definitions for the core NCR5380 driver. */
30
31 #define NCR5380_implementation_fields int pdma_residual
32
33 #define NCR5380_read(reg) in_8(hostdata->io + ((reg) << 4))
34 #define NCR5380_write(reg, value) out_8(hostdata->io + ((reg) << 4), value)
35
36 #define NCR5380_dma_xfer_len macscsi_dma_xfer_len
37 #define NCR5380_dma_recv_setup macscsi_pread
38 #define NCR5380_dma_send_setup macscsi_pwrite
39 #define NCR5380_dma_residual macscsi_dma_residual
40
41 #define NCR5380_intr macscsi_intr
42 #define NCR5380_queue_command macscsi_queue_command
43 #define NCR5380_abort macscsi_abort
44 #define NCR5380_host_reset macscsi_host_reset
45 #define NCR5380_info macscsi_info
46
47 #include "NCR5380.h"
48
49 static int setup_can_queue = -1;
50 module_param(setup_can_queue, int, 0);
51 static int setup_cmd_per_lun = -1;
52 module_param(setup_cmd_per_lun, int, 0);
53 static int setup_sg_tablesize = -1;
54 module_param(setup_sg_tablesize, int, 0);
55 static int setup_use_pdma = -1;
56 module_param(setup_use_pdma, int, 0);
57 static int setup_hostid = -1;
58 module_param(setup_hostid, int, 0);
59 static int setup_toshiba_delay = -1;
60 module_param(setup_toshiba_delay, int, 0);
61
62 #ifndef MODULE
mac_scsi_setup(char * str)63 static int __init mac_scsi_setup(char *str)
64 {
65 int ints[8];
66
67 (void)get_options(str, ARRAY_SIZE(ints), ints);
68
69 if (ints[0] < 1) {
70 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
71 return 0;
72 }
73 if (ints[0] >= 1)
74 setup_can_queue = ints[1];
75 if (ints[0] >= 2)
76 setup_cmd_per_lun = ints[2];
77 if (ints[0] >= 3)
78 setup_sg_tablesize = ints[3];
79 if (ints[0] >= 4)
80 setup_hostid = ints[4];
81 /* ints[5] (use_tagged_queuing) is ignored */
82 if (ints[0] >= 6)
83 setup_use_pdma = ints[6];
84 if (ints[0] >= 7)
85 setup_toshiba_delay = ints[7];
86 return 1;
87 }
88
89 __setup("mac5380=", mac_scsi_setup);
90 #endif /* !MODULE */
91
92 /* Pseudo DMA asm originally by Ove Edlund */
93
94 #define CP_IO_TO_MEM(s,d,n) \
95 __asm__ __volatile__ \
96 (" cmp.w #4,%2\n" \
97 " bls 8f\n" \
98 " move.w %1,%%d0\n" \
99 " neg.b %%d0\n" \
100 " and.w #3,%%d0\n" \
101 " sub.w %%d0,%2\n" \
102 " bra 2f\n" \
103 " 1: move.b (%0),(%1)+\n" \
104 " 2: dbf %%d0,1b\n" \
105 " move.w %2,%%d0\n" \
106 " lsr.w #5,%%d0\n" \
107 " bra 4f\n" \
108 " 3: move.l (%0),(%1)+\n" \
109 "31: move.l (%0),(%1)+\n" \
110 "32: move.l (%0),(%1)+\n" \
111 "33: move.l (%0),(%1)+\n" \
112 "34: move.l (%0),(%1)+\n" \
113 "35: move.l (%0),(%1)+\n" \
114 "36: move.l (%0),(%1)+\n" \
115 "37: move.l (%0),(%1)+\n" \
116 " 4: dbf %%d0,3b\n" \
117 " move.w %2,%%d0\n" \
118 " lsr.w #2,%%d0\n" \
119 " and.w #7,%%d0\n" \
120 " bra 6f\n" \
121 " 5: move.l (%0),(%1)+\n" \
122 " 6: dbf %%d0,5b\n" \
123 " and.w #3,%2\n" \
124 " bra 8f\n" \
125 " 7: move.b (%0),(%1)+\n" \
126 " 8: dbf %2,7b\n" \
127 " moveq.l #0, %2\n" \
128 " 9: \n" \
129 ".section .fixup,\"ax\"\n" \
130 " .even\n" \
131 "91: moveq.l #1, %2\n" \
132 " jra 9b\n" \
133 "94: moveq.l #4, %2\n" \
134 " jra 9b\n" \
135 ".previous\n" \
136 ".section __ex_table,\"a\"\n" \
137 " .align 4\n" \
138 " .long 1b,91b\n" \
139 " .long 3b,94b\n" \
140 " .long 31b,94b\n" \
141 " .long 32b,94b\n" \
142 " .long 33b,94b\n" \
143 " .long 34b,94b\n" \
144 " .long 35b,94b\n" \
145 " .long 36b,94b\n" \
146 " .long 37b,94b\n" \
147 " .long 5b,94b\n" \
148 " .long 7b,91b\n" \
149 ".previous" \
150 : "=a"(s), "=a"(d), "=d"(n) \
151 : "0"(s), "1"(d), "2"(n) \
152 : "d0")
153
macscsi_pread(struct NCR5380_hostdata * hostdata,unsigned char * dst,int len)154 static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
155 unsigned char *dst, int len)
156 {
157 u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
158 unsigned char *d = dst;
159 int n = len;
160 int transferred;
161
162 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
163 BASR_DRQ | BASR_PHASE_MATCH,
164 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
165 CP_IO_TO_MEM(s, d, n);
166
167 transferred = d - dst - n;
168 hostdata->pdma_residual = len - transferred;
169
170 /* No bus error. */
171 if (n == 0)
172 return 0;
173
174 /* Target changed phase early? */
175 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
176 BUS_AND_STATUS_REG, BASR_ACK, BASR_ACK, HZ / 64) < 0)
177 scmd_printk(KERN_ERR, hostdata->connected,
178 "%s: !REQ and !ACK\n", __func__);
179 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
180 return 0;
181
182 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
183 "%s: bus error (%d/%d)\n", __func__, transferred, len);
184 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
185 d = dst + transferred;
186 n = len - transferred;
187 }
188
189 scmd_printk(KERN_ERR, hostdata->connected,
190 "%s: phase mismatch or !DRQ\n", __func__);
191 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
192 return -1;
193 }
194
195
196 #define CP_MEM_TO_IO(s,d,n) \
197 __asm__ __volatile__ \
198 (" cmp.w #4,%2\n" \
199 " bls 8f\n" \
200 " move.w %0,%%d0\n" \
201 " neg.b %%d0\n" \
202 " and.w #3,%%d0\n" \
203 " sub.w %%d0,%2\n" \
204 " bra 2f\n" \
205 " 1: move.b (%0)+,(%1)\n" \
206 " 2: dbf %%d0,1b\n" \
207 " move.w %2,%%d0\n" \
208 " lsr.w #5,%%d0\n" \
209 " bra 4f\n" \
210 " 3: move.l (%0)+,(%1)\n" \
211 "31: move.l (%0)+,(%1)\n" \
212 "32: move.l (%0)+,(%1)\n" \
213 "33: move.l (%0)+,(%1)\n" \
214 "34: move.l (%0)+,(%1)\n" \
215 "35: move.l (%0)+,(%1)\n" \
216 "36: move.l (%0)+,(%1)\n" \
217 "37: move.l (%0)+,(%1)\n" \
218 " 4: dbf %%d0,3b\n" \
219 " move.w %2,%%d0\n" \
220 " lsr.w #2,%%d0\n" \
221 " and.w #7,%%d0\n" \
222 " bra 6f\n" \
223 " 5: move.l (%0)+,(%1)\n" \
224 " 6: dbf %%d0,5b\n" \
225 " and.w #3,%2\n" \
226 " bra 8f\n" \
227 " 7: move.b (%0)+,(%1)\n" \
228 " 8: dbf %2,7b\n" \
229 " moveq.l #0, %2\n" \
230 " 9: \n" \
231 ".section .fixup,\"ax\"\n" \
232 " .even\n" \
233 "91: moveq.l #1, %2\n" \
234 " jra 9b\n" \
235 "94: moveq.l #4, %2\n" \
236 " jra 9b\n" \
237 ".previous\n" \
238 ".section __ex_table,\"a\"\n" \
239 " .align 4\n" \
240 " .long 1b,91b\n" \
241 " .long 3b,94b\n" \
242 " .long 31b,94b\n" \
243 " .long 32b,94b\n" \
244 " .long 33b,94b\n" \
245 " .long 34b,94b\n" \
246 " .long 35b,94b\n" \
247 " .long 36b,94b\n" \
248 " .long 37b,94b\n" \
249 " .long 5b,94b\n" \
250 " .long 7b,91b\n" \
251 ".previous" \
252 : "=a"(s), "=a"(d), "=d"(n) \
253 : "0"(s), "1"(d), "2"(n) \
254 : "d0")
255
macscsi_pwrite(struct NCR5380_hostdata * hostdata,unsigned char * src,int len)256 static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
257 unsigned char *src, int len)
258 {
259 unsigned char *s = src;
260 u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
261 int n = len;
262 int transferred;
263
264 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
265 BASR_DRQ | BASR_PHASE_MATCH,
266 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
267 CP_MEM_TO_IO(s, d, n);
268
269 transferred = s - src - n;
270 hostdata->pdma_residual = len - transferred;
271
272 /* Target changed phase early? */
273 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
274 BUS_AND_STATUS_REG, BASR_ACK, BASR_ACK, HZ / 64) < 0)
275 scmd_printk(KERN_ERR, hostdata->connected,
276 "%s: !REQ and !ACK\n", __func__);
277 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
278 return 0;
279
280 /* No bus error. */
281 if (n == 0) {
282 if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
283 TCR_LAST_BYTE_SENT,
284 TCR_LAST_BYTE_SENT, HZ / 64) < 0)
285 scmd_printk(KERN_ERR, hostdata->connected,
286 "%s: Last Byte Sent timeout\n", __func__);
287 return 0;
288 }
289
290 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
291 "%s: bus error (%d/%d)\n", __func__, transferred, len);
292 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
293 s = src + transferred;
294 n = len - transferred;
295 }
296
297 scmd_printk(KERN_ERR, hostdata->connected,
298 "%s: phase mismatch or !DRQ\n", __func__);
299 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
300
301 return -1;
302 }
303
macscsi_dma_xfer_len(struct NCR5380_hostdata * hostdata,struct scsi_cmnd * cmd)304 static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
305 struct scsi_cmnd *cmd)
306 {
307 if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
308 cmd->SCp.this_residual < 16)
309 return 0;
310
311 return cmd->SCp.this_residual;
312 }
313
macscsi_dma_residual(struct NCR5380_hostdata * hostdata)314 static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
315 {
316 return hostdata->pdma_residual;
317 }
318
319 #include "NCR5380.c"
320
321 #define DRV_MODULE_NAME "mac_scsi"
322 #define PFX DRV_MODULE_NAME ": "
323
324 static struct scsi_host_template mac_scsi_template = {
325 .module = THIS_MODULE,
326 .proc_name = DRV_MODULE_NAME,
327 .name = "Macintosh NCR5380 SCSI",
328 .info = macscsi_info,
329 .queuecommand = macscsi_queue_command,
330 .eh_abort_handler = macscsi_abort,
331 .eh_host_reset_handler = macscsi_host_reset,
332 .can_queue = 16,
333 .this_id = 7,
334 .sg_tablesize = 1,
335 .cmd_per_lun = 2,
336 .use_clustering = DISABLE_CLUSTERING,
337 .cmd_size = NCR5380_CMD_SIZE,
338 .max_sectors = 128,
339 };
340
mac_scsi_probe(struct platform_device * pdev)341 static int __init mac_scsi_probe(struct platform_device *pdev)
342 {
343 struct Scsi_Host *instance;
344 struct NCR5380_hostdata *hostdata;
345 int error;
346 int host_flags = 0;
347 struct resource *irq, *pio_mem, *pdma_mem = NULL;
348
349 pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
350 if (!pio_mem)
351 return -ENODEV;
352
353 pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
354
355 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
356
357 if (!hwreg_present((unsigned char *)pio_mem->start +
358 (STATUS_REG << 4))) {
359 pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
360 return -ENODEV;
361 }
362
363 if (setup_can_queue > 0)
364 mac_scsi_template.can_queue = setup_can_queue;
365 if (setup_cmd_per_lun > 0)
366 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
367 if (setup_sg_tablesize >= 0)
368 mac_scsi_template.sg_tablesize = setup_sg_tablesize;
369 if (setup_hostid >= 0)
370 mac_scsi_template.this_id = setup_hostid & 7;
371
372 instance = scsi_host_alloc(&mac_scsi_template,
373 sizeof(struct NCR5380_hostdata));
374 if (!instance)
375 return -ENOMEM;
376
377 if (irq)
378 instance->irq = irq->start;
379 else
380 instance->irq = NO_IRQ;
381
382 hostdata = shost_priv(instance);
383 hostdata->base = pio_mem->start;
384 hostdata->io = (u8 __iomem *)pio_mem->start;
385
386 if (pdma_mem && setup_use_pdma)
387 hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
388 else
389 host_flags |= FLAG_NO_PSEUDO_DMA;
390
391 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
392
393 error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
394 if (error)
395 goto fail_init;
396
397 if (instance->irq != NO_IRQ) {
398 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
399 "NCR5380", instance);
400 if (error)
401 goto fail_irq;
402 }
403
404 NCR5380_maybe_reset_bus(instance);
405
406 error = scsi_add_host(instance, NULL);
407 if (error)
408 goto fail_host;
409
410 platform_set_drvdata(pdev, instance);
411
412 scsi_scan_host(instance);
413 return 0;
414
415 fail_host:
416 if (instance->irq != NO_IRQ)
417 free_irq(instance->irq, instance);
418 fail_irq:
419 NCR5380_exit(instance);
420 fail_init:
421 scsi_host_put(instance);
422 return error;
423 }
424
mac_scsi_remove(struct platform_device * pdev)425 static int __exit mac_scsi_remove(struct platform_device *pdev)
426 {
427 struct Scsi_Host *instance = platform_get_drvdata(pdev);
428
429 scsi_remove_host(instance);
430 if (instance->irq != NO_IRQ)
431 free_irq(instance->irq, instance);
432 NCR5380_exit(instance);
433 scsi_host_put(instance);
434 return 0;
435 }
436
437 static struct platform_driver mac_scsi_driver = {
438 .remove = __exit_p(mac_scsi_remove),
439 .driver = {
440 .name = DRV_MODULE_NAME,
441 },
442 };
443
444 module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
445
446 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
447 MODULE_LICENSE("GPL");
448
