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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / scsi / sun_esp.c
blob3d73aad4bc8201196946e2a1e2c19e4e98157327
1 /* sun_esp.c: ESP front-end for Sparc SBUS systems.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller (davem@davemloft.net)
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/delay.h>
9 #include <linux/module.h>
10 #include <linux/mm.h>
11 #include <linux/init.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/of.h>
14 #include <linux/of_device.h>
15
16 #include <asm/irq.h>
17 #include <asm/io.h>
18 #include <asm/dma.h>
19
20 #include <scsi/scsi_host.h>
21
22 #include "esp_scsi.h"
23
24 #define DRV_MODULE_NAME "sun_esp"
25 #define PFX DRV_MODULE_NAME ": "
26 #define DRV_VERSION "1.100"
27 #define DRV_MODULE_RELDATE "August 27, 2008"
28
29 #define dma_read32(REG) \
30 sbus_readl(esp->dma_regs + (REG))
31 #define dma_write32(VAL, REG) \
32 sbus_writel((VAL), esp->dma_regs + (REG))
33
34 /* DVMA chip revisions */
35 enum dvma_rev {
36 dvmarev0,
37 dvmaesc1,
38 dvmarev1,
39 dvmarev2,
40 dvmarev3,
41 dvmarevplus,
42 dvmahme
43 };
44
45 static int __devinit esp_sbus_setup_dma(struct esp *esp,
46 struct of_device *dma_of)
47 {
48 esp->dma = dma_of;
49
50 esp->dma_regs = of_ioremap(&dma_of->resource[0], 0,
51 resource_size(&dma_of->resource[0]),
52 "espdma");
53 if (!esp->dma_regs)
54 return -ENOMEM;
55
56 switch (dma_read32(DMA_CSR) & DMA_DEVICE_ID) {
57 case DMA_VERS0:
58 esp->dmarev = dvmarev0;
59 break;
60 case DMA_ESCV1:
61 esp->dmarev = dvmaesc1;
62 break;
63 case DMA_VERS1:
64 esp->dmarev = dvmarev1;
65 break;
66 case DMA_VERS2:
67 esp->dmarev = dvmarev2;
68 break;
69 case DMA_VERHME:
70 esp->dmarev = dvmahme;
71 break;
72 case DMA_VERSPLUS:
73 esp->dmarev = dvmarevplus;
74 break;
75 }
76
77 return 0;
78
79 }
80
81 static int __devinit esp_sbus_map_regs(struct esp *esp, int hme)
82 {
83 struct of_device *op = esp->dev;
84 struct resource *res;
85
86 /* On HME, two reg sets exist, first is DVMA,
87 * second is ESP registers.
88 */
89 if (hme)
90 res = &op->resource[1];
91 else
92 res = &op->resource[0];
93
94 esp->regs = of_ioremap(res, 0, SBUS_ESP_REG_SIZE, "ESP");
95 if (!esp->regs)
96 return -ENOMEM;
97
98 return 0;
99 }
100
101 static int __devinit esp_sbus_map_command_block(struct esp *esp)
102 {
103 struct of_device *op = esp->dev;
104
105 esp->command_block = dma_alloc_coherent(&op->dev, 16,
106 &esp->command_block_dma,
107 GFP_ATOMIC);
108 if (!esp->command_block)
109 return -ENOMEM;
110 return 0;
111 }
112
113 static int __devinit esp_sbus_register_irq(struct esp *esp)
114 {
115 struct Scsi_Host *host = esp->host;
116 struct of_device *op = esp->dev;
117
118 host->irq = op->irqs[0];
119 return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
120 }
121
122 static void __devinit esp_get_scsi_id(struct esp *esp, struct of_device *espdma)
123 {
124 struct of_device *op = esp->dev;
125 struct device_node *dp;
126
127 dp = op->node;
128 esp->scsi_id = of_getintprop_default(dp, "initiator-id", 0xff);
129 if (esp->scsi_id != 0xff)
130 goto done;
131
132 esp->scsi_id = of_getintprop_default(dp, "scsi-initiator-id", 0xff);
133 if (esp->scsi_id != 0xff)
134 goto done;
135
136 esp->scsi_id = of_getintprop_default(espdma->node,
137 "scsi-initiator-id", 7);
138
139 done:
140 esp->host->this_id = esp->scsi_id;
141 esp->scsi_id_mask = (1 << esp->scsi_id);
142 }
143
144 static void __devinit esp_get_differential(struct esp *esp)
145 {
146 struct of_device *op = esp->dev;
147 struct device_node *dp;
148
149 dp = op->node;
150 if (of_find_property(dp, "differential", NULL))
151 esp->flags |= ESP_FLAG_DIFFERENTIAL;
152 else
153 esp->flags &= ~ESP_FLAG_DIFFERENTIAL;
154 }
155
156 static void __devinit esp_get_clock_params(struct esp *esp)
157 {
158 struct of_device *op = esp->dev;
159 struct device_node *bus_dp, *dp;
160 int fmhz;
161
162 dp = op->node;
163 bus_dp = dp->parent;
164
165 fmhz = of_getintprop_default(dp, "clock-frequency", 0);
166 if (fmhz == 0)
167 fmhz = of_getintprop_default(bus_dp, "clock-frequency", 0);
168
169 esp->cfreq = fmhz;
170 }
171
172 static void __devinit esp_get_bursts(struct esp *esp, struct of_device *dma_of)
173 {
174 struct device_node *dma_dp = dma_of->node;
175 struct of_device *op = esp->dev;
176 struct device_node *dp;
177 u8 bursts, val;
178
179 dp = op->node;
180 bursts = of_getintprop_default(dp, "burst-sizes", 0xff);
181 val = of_getintprop_default(dma_dp, "burst-sizes", 0xff);
182 if (val != 0xff)
183 bursts &= val;
184
185 val = of_getintprop_default(dma_dp->parent, "burst-sizes", 0xff);
186 if (val != 0xff)
187 bursts &= val;
188
189 if (bursts == 0xff ||
190 (bursts & DMA_BURST16) == 0 ||
191 (bursts & DMA_BURST32) == 0)
192 bursts = (DMA_BURST32 - 1);
193
194 esp->bursts = bursts;
195 }
196
197 static void __devinit esp_sbus_get_props(struct esp *esp, struct of_device *espdma)
198 {
199 esp_get_scsi_id(esp, espdma);
200 esp_get_differential(esp);
201 esp_get_clock_params(esp);
202 esp_get_bursts(esp, espdma);
203 }
204
205 static void sbus_esp_write8(struct esp *esp, u8 val, unsigned long reg)
206 {
207 sbus_writeb(val, esp->regs + (reg * 4UL));
208 }
209
210 static u8 sbus_esp_read8(struct esp *esp, unsigned long reg)
211 {
212 return sbus_readb(esp->regs + (reg * 4UL));
213 }
214
215 static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf,
216 size_t sz, int dir)
217 {
218 struct of_device *op = esp->dev;
219
220 return dma_map_single(&op->dev, buf, sz, dir);
221 }
222
223 static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg,
224 int num_sg, int dir)
225 {
226 struct of_device *op = esp->dev;
227
228 return dma_map_sg(&op->dev, sg, num_sg, dir);
229 }
230
231 static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr,
232 size_t sz, int dir)
233 {
234 struct of_device *op = esp->dev;
235
236 dma_unmap_single(&op->dev, addr, sz, dir);
237 }
238
239 static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
240 int num_sg, int dir)
241 {
242 struct of_device *op = esp->dev;
243
244 dma_unmap_sg(&op->dev, sg, num_sg, dir);
245 }
246
247 static int sbus_esp_irq_pending(struct esp *esp)
248 {
249 if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
250 return 1;
251 return 0;
252 }
253
254 static void sbus_esp_reset_dma(struct esp *esp)
255 {
256 int can_do_burst16, can_do_burst32, can_do_burst64;
257 int can_do_sbus64, lim;
258 struct of_device *op;
259 u32 val;
260
261 can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
262 can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
263 can_do_burst64 = 0;
264 can_do_sbus64 = 0;
265 op = esp->dev;
266 if (sbus_can_dma_64bit())
267 can_do_sbus64 = 1;
268 if (sbus_can_burst64())
269 can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
270
271 /* Put the DVMA into a known state. */
272 if (esp->dmarev != dvmahme) {
273 val = dma_read32(DMA_CSR);
274 dma_write32(val | DMA_RST_SCSI, DMA_CSR);
275 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
276 }
277 switch (esp->dmarev) {
278 case dvmahme:
279 dma_write32(DMA_RESET_FAS366, DMA_CSR);
280 dma_write32(DMA_RST_SCSI, DMA_CSR);
281
282 esp->prev_hme_dmacsr = (DMA_PARITY_OFF | DMA_2CLKS |
283 DMA_SCSI_DISAB | DMA_INT_ENAB);
284
285 esp->prev_hme_dmacsr &= ~(DMA_ENABLE | DMA_ST_WRITE |
286 DMA_BRST_SZ);
287
288 if (can_do_burst64)
289 esp->prev_hme_dmacsr |= DMA_BRST64;
290 else if (can_do_burst32)
291 esp->prev_hme_dmacsr |= DMA_BRST32;
292
293 if (can_do_sbus64) {
294 esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
295 sbus_set_sbus64(&op->dev, esp->bursts);
296 }
297
298 lim = 1000;
299 while (dma_read32(DMA_CSR) & DMA_PEND_READ) {
300 if (--lim == 0) {
301 printk(KERN_ALERT PFX "esp%d: DMA_PEND_READ "
302 "will not clear!\n",
303 esp->host->unique_id);
304 break;
305 }
306 udelay(1);
307 }
308
309 dma_write32(0, DMA_CSR);
310 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
311
312 dma_write32(0, DMA_ADDR);
313 break;
314
315 case dvmarev2:
316 if (esp->rev != ESP100) {
317 val = dma_read32(DMA_CSR);
318 dma_write32(val | DMA_3CLKS, DMA_CSR);
319 }
320 break;
321
322 case dvmarev3:
323 val = dma_read32(DMA_CSR);
324 val &= ~DMA_3CLKS;
325 val |= DMA_2CLKS;
326 if (can_do_burst32) {
327 val &= ~DMA_BRST_SZ;
328 val |= DMA_BRST32;
329 }
330 dma_write32(val, DMA_CSR);
331 break;
332
333 case dvmaesc1:
334 val = dma_read32(DMA_CSR);
335 val |= DMA_ADD_ENABLE;
336 val &= ~DMA_BCNT_ENAB;
337 if (!can_do_burst32 && can_do_burst16) {
338 val |= DMA_ESC_BURST;
339 } else {
340 val &= ~(DMA_ESC_BURST);
341 }
342 dma_write32(val, DMA_CSR);
343 break;
344
345 default:
346 break;
347 }
348
349 /* Enable interrupts. */
350 val = dma_read32(DMA_CSR);
351 dma_write32(val | DMA_INT_ENAB, DMA_CSR);
352 }
353
354 static void sbus_esp_dma_drain(struct esp *esp)
355 {
356 u32 csr;
357 int lim;
358
359 if (esp->dmarev == dvmahme)
360 return;
361
362 csr = dma_read32(DMA_CSR);
363 if (!(csr & DMA_FIFO_ISDRAIN))
364 return;
365
366 if (esp->dmarev != dvmarev3 && esp->dmarev != dvmaesc1)
367 dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR);
368
369 lim = 1000;
370 while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) {
371 if (--lim == 0) {
372 printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n",
373 esp->host->unique_id);
374 break;
375 }
376 udelay(1);
377 }
378 }
379
380 static void sbus_esp_dma_invalidate(struct esp *esp)
381 {
382 if (esp->dmarev == dvmahme) {
383 dma_write32(DMA_RST_SCSI, DMA_CSR);
384
385 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
386 (DMA_PARITY_OFF | DMA_2CLKS |
387 DMA_SCSI_DISAB | DMA_INT_ENAB)) &
388 ~(DMA_ST_WRITE | DMA_ENABLE));
389
390 dma_write32(0, DMA_CSR);
391 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
392
393 /* This is necessary to avoid having the SCSI channel
394 * engine lock up on us.
395 */
396 dma_write32(0, DMA_ADDR);
397 } else {
398 u32 val;
399 int lim;
400
401 lim = 1000;
402 while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) {
403 if (--lim == 0) {
404 printk(KERN_ALERT PFX "esp%d: DMA will not "
405 "invalidate!\n", esp->host->unique_id);
406 break;
407 }
408 udelay(1);
409 }
410
411 val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
412 val |= DMA_FIFO_INV;
413 dma_write32(val, DMA_CSR);
414 val &= ~DMA_FIFO_INV;
415 dma_write32(val, DMA_CSR);
416 }
417 }
418
419 static void sbus_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
420 u32 dma_count, int write, u8 cmd)
421 {
422 u32 csr;
423
424 BUG_ON(!(cmd & ESP_CMD_DMA));
425
426 sbus_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
427 sbus_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
428 if (esp->rev == FASHME) {
429 sbus_esp_write8(esp, (esp_count >> 16) & 0xff, FAS_RLO);
430 sbus_esp_write8(esp, 0, FAS_RHI);
431
432 scsi_esp_cmd(esp, cmd);
433
434 csr = esp->prev_hme_dmacsr;
435 csr |= DMA_SCSI_DISAB | DMA_ENABLE;
436 if (write)
437 csr |= DMA_ST_WRITE;
438 else
439 csr &= ~DMA_ST_WRITE;
440 esp->prev_hme_dmacsr = csr;
441
442 dma_write32(dma_count, DMA_COUNT);
443 dma_write32(addr, DMA_ADDR);
444 dma_write32(csr, DMA_CSR);
445 } else {
446 csr = dma_read32(DMA_CSR);
447 csr |= DMA_ENABLE;
448 if (write)
449 csr |= DMA_ST_WRITE;
450 else
451 csr &= ~DMA_ST_WRITE;
452 dma_write32(csr, DMA_CSR);
453 if (esp->dmarev == dvmaesc1) {
454 u32 end = PAGE_ALIGN(addr + dma_count + 16U);
455 dma_write32(end - addr, DMA_COUNT);
456 }
457 dma_write32(addr, DMA_ADDR);
458
459 scsi_esp_cmd(esp, cmd);
460 }
461
462 }
463
464 static int sbus_esp_dma_error(struct esp *esp)
465 {
466 u32 csr = dma_read32(DMA_CSR);
467
468 if (csr & DMA_HNDL_ERROR)
469 return 1;
470
471 return 0;
472 }
473
474 static const struct esp_driver_ops sbus_esp_ops = {
475 .esp_write8 = sbus_esp_write8,
476 .esp_read8 = sbus_esp_read8,
477 .map_single = sbus_esp_map_single,
478 .map_sg = sbus_esp_map_sg,
479 .unmap_single = sbus_esp_unmap_single,
480 .unmap_sg = sbus_esp_unmap_sg,
481 .irq_pending = sbus_esp_irq_pending,
482 .reset_dma = sbus_esp_reset_dma,
483 .dma_drain = sbus_esp_dma_drain,
484 .dma_invalidate = sbus_esp_dma_invalidate,
485 .send_dma_cmd = sbus_esp_send_dma_cmd,
486 .dma_error = sbus_esp_dma_error,
487 };
488
489 static int __devinit esp_sbus_probe_one(struct of_device *op,
490 struct of_device *espdma,
491 int hme)
492 {
493 struct scsi_host_template *tpnt = &scsi_esp_template;
494 struct Scsi_Host *host;
495 struct esp *esp;
496 int err;
497
498 host = scsi_host_alloc(tpnt, sizeof(struct esp));
499
500 err = -ENOMEM;
501 if (!host)
502 goto fail;
503
504 host->max_id = (hme ? 16 : 8);
505 esp = shost_priv(host);
506
507 esp->host = host;
508 esp->dev = op;
509 esp->ops = &sbus_esp_ops;
510
511 if (hme)
512 esp->flags |= ESP_FLAG_WIDE_CAPABLE;
513
514 err = esp_sbus_setup_dma(esp, espdma);
515 if (err < 0)
516 goto fail_unlink;
517
518 err = esp_sbus_map_regs(esp, hme);
519 if (err < 0)
520 goto fail_unlink;
521
522 err = esp_sbus_map_command_block(esp);
523 if (err < 0)
524 goto fail_unmap_regs;
525
526 err = esp_sbus_register_irq(esp);
527 if (err < 0)
528 goto fail_unmap_command_block;
529
530 esp_sbus_get_props(esp, espdma);
531
532 /* Before we try to touch the ESP chip, ESC1 dma can
533 * come up with the reset bit set, so make sure that
534 * is clear first.
535 */
536 if (esp->dmarev == dvmaesc1) {
537 u32 val = dma_read32(DMA_CSR);
538
539 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
540 }
541
542 dev_set_drvdata(&op->dev, esp);
543
544 err = scsi_esp_register(esp, &op->dev);
545 if (err)
546 goto fail_free_irq;
547
548 return 0;
549
550 fail_free_irq:
551 free_irq(host->irq, esp);
552 fail_unmap_command_block:
553 dma_free_coherent(&op->dev, 16,
554 esp->command_block,
555 esp->command_block_dma);
556 fail_unmap_regs:
557 of_iounmap(&op->resource[(hme ? 1 : 0)], esp->regs, SBUS_ESP_REG_SIZE);
558 fail_unlink:
559 scsi_host_put(host);
560 fail:
561 return err;
562 }
563
564 static int __devinit esp_sbus_probe(struct of_device *op, const struct of_device_id *match)
565 {
566 struct device_node *dma_node = NULL;
567 struct device_node *dp = op->node;
568 struct of_device *dma_of = NULL;
569 int hme = 0;
570
571 if (dp->parent &&
572 (!strcmp(dp->parent->name, "espdma") ||
573 !strcmp(dp->parent->name, "dma")))
574 dma_node = dp->parent;
575 else if (!strcmp(dp->name, "SUNW,fas")) {
576 dma_node = op->node;
577 hme = 1;
578 }
579 if (dma_node)
580 dma_of = of_find_device_by_node(dma_node);
581 if (!dma_of)
582 return -ENODEV;
583
584 return esp_sbus_probe_one(op, dma_of, hme);
585 }
586
587 static int __devexit esp_sbus_remove(struct of_device *op)
588 {
589 struct esp *esp = dev_get_drvdata(&op->dev);
590 struct of_device *dma_of = esp->dma;
591 unsigned int irq = esp->host->irq;
592 bool is_hme;
593 u32 val;
594
595 scsi_esp_unregister(esp);
596
597 /* Disable interrupts. */
598 val = dma_read32(DMA_CSR);
599 dma_write32(val & ~DMA_INT_ENAB, DMA_CSR);
600
601 free_irq(irq, esp);
602
603 is_hme = (esp->dmarev == dvmahme);
604
605 dma_free_coherent(&op->dev, 16,
606 esp->command_block,
607 esp->command_block_dma);
608 of_iounmap(&op->resource[(is_hme ? 1 : 0)], esp->regs,
609 SBUS_ESP_REG_SIZE);
610 of_iounmap(&dma_of->resource[0], esp->dma_regs,
611 resource_size(&dma_of->resource[0]));
612
613 scsi_host_put(esp->host);
614
615 dev_set_drvdata(&op->dev, NULL);
616
617 return 0;
618 }
619
620 static const struct of_device_id esp_match[] = {
621 {
622 .name = "SUNW,esp",
623 },
624 {
625 .name = "SUNW,fas",
626 },
627 {
628 .name = "esp",
629 },
630 {},
631 };
632 MODULE_DEVICE_TABLE(of, esp_match);
633
634 static struct of_platform_driver esp_sbus_driver = {
635 .name = "esp",
636 .match_table = esp_match,
637 .probe = esp_sbus_probe,
638 .remove = __devexit_p(esp_sbus_remove),
639 };
640
641 static int __init sunesp_init(void)
642 {
643 return of_register_driver(&esp_sbus_driver, &of_bus_type);
644 }
645
646 static void __exit sunesp_exit(void)
647 {
648 of_unregister_driver(&esp_sbus_driver);
649 }
650
651 MODULE_DESCRIPTION("Sun ESP SCSI driver");
652 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
653 MODULE_LICENSE("GPL");
654 MODULE_VERSION(DRV_VERSION);
655
656 module_init(sunesp_init);
657 module_exit(sunesp_exit);