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ACPI: check a return value correctly in acpi_power_get_context()
[linux-2.6.22.y-op.git] / drivers / scsi / sun_esp.c
blobbbeb2451d32f950432b604ecfb18fa3a13f59b00
1 /* sun_esp.c: ESP front-end for Sparc SBUS systems.
2 *
3 * Copyright (C) 2007 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/init.h>
11
12 #include <asm/irq.h>
13 #include <asm/io.h>
14 #include <asm/dma.h>
15
16 #include <asm/sbus.h>
17
18 #include <scsi/scsi_host.h>
19
20 #include "esp_scsi.h"
21
22 #define DRV_MODULE_NAME "sun_esp"
23 #define PFX DRV_MODULE_NAME ": "
24 #define DRV_VERSION "1.000"
25 #define DRV_MODULE_RELDATE "April 19, 2007"
26
27 #define dma_read32(REG) \
28 sbus_readl(esp->dma_regs + (REG))
29 #define dma_write32(VAL, REG) \
30 sbus_writel((VAL), esp->dma_regs + (REG))
31
32 static int __devinit esp_sbus_find_dma(struct esp *esp, struct sbus_dev *dma_sdev)
33 {
34 struct sbus_dev *sdev = esp->dev;
35 struct sbus_dma *dma;
36
37 if (dma_sdev != NULL) {
38 for_each_dvma(dma) {
39 if (dma->sdev == dma_sdev)
40 break;
41 }
42 } else {
43 for_each_dvma(dma) {
44 if (dma->sdev == NULL)
45 break;
46
47 /* If bus + slot are the same and it has the
48 * correct OBP name, it's ours.
49 */
50 if (sdev->bus == dma->sdev->bus &&
51 sdev->slot == dma->sdev->slot &&
52 (!strcmp(dma->sdev->prom_name, "dma") ||
53 !strcmp(dma->sdev->prom_name, "espdma")))
54 break;
55 }
56 }
57
58 if (dma == NULL) {
59 printk(KERN_ERR PFX "[%s] Cannot find dma.\n",
60 sdev->ofdev.node->full_name);
61 return -ENODEV;
62 }
63 esp->dma = dma;
64 esp->dma_regs = dma->regs;
65
66 return 0;
67
68 }
69
70 static int __devinit esp_sbus_map_regs(struct esp *esp, int hme)
71 {
72 struct sbus_dev *sdev = esp->dev;
73 struct resource *res;
74
75 /* On HME, two reg sets exist, first is DVMA,
76 * second is ESP registers.
77 */
78 if (hme)
79 res = &sdev->resource[1];
80 else
81 res = &sdev->resource[0];
82
83 esp->regs = sbus_ioremap(res, 0, SBUS_ESP_REG_SIZE, "ESP");
84 if (!esp->regs)
85 return -ENOMEM;
86
87 return 0;
88 }
89
90 static int __devinit esp_sbus_map_command_block(struct esp *esp)
91 {
92 struct sbus_dev *sdev = esp->dev;
93
94 esp->command_block = sbus_alloc_consistent(sdev, 16,
95 &esp->command_block_dma);
96 if (!esp->command_block)
97 return -ENOMEM;
98 return 0;
99 }
100
101 static int __devinit esp_sbus_register_irq(struct esp *esp)
102 {
103 struct Scsi_Host *host = esp->host;
104 struct sbus_dev *sdev = esp->dev;
105
106 host->irq = sdev->irqs[0];
107 return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
108 }
109
110 static void __devinit esp_get_scsi_id(struct esp *esp)
111 {
112 struct sbus_dev *sdev = esp->dev;
113 struct device_node *dp = sdev->ofdev.node;
114
115 esp->scsi_id = of_getintprop_default(dp, "initiator-id", 0xff);
116 if (esp->scsi_id != 0xff)
117 goto done;
118
119 esp->scsi_id = of_getintprop_default(dp, "scsi-initiator-id", 0xff);
120 if (esp->scsi_id != 0xff)
121 goto done;
122
123 if (!sdev->bus) {
124 /* SUN4 */
125 esp->scsi_id = 7;
126 goto done;
127 }
128
129 esp->scsi_id = of_getintprop_default(sdev->bus->ofdev.node,
130 "scsi-initiator-id", 7);
131
132 done:
133 esp->host->this_id = esp->scsi_id;
134 esp->scsi_id_mask = (1 << esp->scsi_id);
135 }
136
137 static void __devinit esp_get_differential(struct esp *esp)
138 {
139 struct sbus_dev *sdev = esp->dev;
140 struct device_node *dp = sdev->ofdev.node;
141
142 if (of_find_property(dp, "differential", NULL))
143 esp->flags |= ESP_FLAG_DIFFERENTIAL;
144 else
145 esp->flags &= ~ESP_FLAG_DIFFERENTIAL;
146 }
147
148 static void __devinit esp_get_clock_params(struct esp *esp)
149 {
150 struct sbus_dev *sdev = esp->dev;
151 struct device_node *dp = sdev->ofdev.node;
152 struct device_node *bus_dp;
153 int fmhz;
154
155 bus_dp = NULL;
156 if (sdev != NULL && sdev->bus != NULL)
157 bus_dp = sdev->bus->ofdev.node;
158
159 fmhz = of_getintprop_default(dp, "clock-frequency", 0);
160 if (fmhz == 0)
161 fmhz = (!bus_dp) ? 0 :
162 of_getintprop_default(bus_dp, "clock-frequency", 0);
163
164 esp->cfreq = fmhz;
165 }
166
167 static void __devinit esp_get_bursts(struct esp *esp, struct sbus_dev *dma)
168 {
169 struct sbus_dev *sdev = esp->dev;
170 struct device_node *dp = sdev->ofdev.node;
171 u8 bursts;
172
173 bursts = of_getintprop_default(dp, "burst-sizes", 0xff);
174 if (dma) {
175 struct device_node *dma_dp = dma->ofdev.node;
176 u8 val = of_getintprop_default(dma_dp, "burst-sizes", 0xff);
177 if (val != 0xff)
178 bursts &= val;
179 }
180
181 if (sdev->bus) {
182 u8 val = of_getintprop_default(sdev->bus->ofdev.node,
183 "burst-sizes", 0xff);
184 if (val != 0xff)
185 bursts &= val;
186 }
187
188 if (bursts == 0xff ||
189 (bursts & DMA_BURST16) == 0 ||
190 (bursts & DMA_BURST32) == 0)
191 bursts = (DMA_BURST32 - 1);
192
193 esp->bursts = bursts;
194 }
195
196 static void __devinit esp_sbus_get_props(struct esp *esp, struct sbus_dev *espdma)
197 {
198 esp_get_scsi_id(esp);
199 esp_get_differential(esp);
200 esp_get_clock_params(esp);
201 esp_get_bursts(esp, espdma);
202 }
203
204 static void sbus_esp_write8(struct esp *esp, u8 val, unsigned long reg)
205 {
206 sbus_writeb(val, esp->regs + (reg * 4UL));
207 }
208
209 static u8 sbus_esp_read8(struct esp *esp, unsigned long reg)
210 {
211 return sbus_readb(esp->regs + (reg * 4UL));
212 }
213
214 static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf,
215 size_t sz, int dir)
216 {
217 return sbus_map_single(esp->dev, buf, sz, dir);
218 }
219
220 static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg,
221 int num_sg, int dir)
222 {
223 return sbus_map_sg(esp->dev, sg, num_sg, dir);
224 }
225
226 static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr,
227 size_t sz, int dir)
228 {
229 sbus_unmap_single(esp->dev, addr, sz, dir);
230 }
231
232 static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
233 int num_sg, int dir)
234 {
235 sbus_unmap_sg(esp->dev, sg, num_sg, dir);
236 }
237
238 static int sbus_esp_irq_pending(struct esp *esp)
239 {
240 if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
241 return 1;
242 return 0;
243 }
244
245 static void sbus_esp_reset_dma(struct esp *esp)
246 {
247 int can_do_burst16, can_do_burst32, can_do_burst64;
248 int can_do_sbus64, lim;
249 u32 val;
250
251 can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
252 can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
253 can_do_burst64 = 0;
254 can_do_sbus64 = 0;
255 if (sbus_can_dma_64bit(esp->dev))
256 can_do_sbus64 = 1;
257 if (sbus_can_burst64(esp->sdev))
258 can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
259
260 /* Put the DVMA into a known state. */
261 if (esp->dma->revision != dvmahme) {
262 val = dma_read32(DMA_CSR);
263 dma_write32(val | DMA_RST_SCSI, DMA_CSR);
264 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
265 }
266 switch (esp->dma->revision) {
267 case dvmahme:
268 dma_write32(DMA_RESET_FAS366, DMA_CSR);
269 dma_write32(DMA_RST_SCSI, DMA_CSR);
270
271 esp->prev_hme_dmacsr = (DMA_PARITY_OFF | DMA_2CLKS |
272 DMA_SCSI_DISAB | DMA_INT_ENAB);
273
274 esp->prev_hme_dmacsr &= ~(DMA_ENABLE | DMA_ST_WRITE |
275 DMA_BRST_SZ);
276
277 if (can_do_burst64)
278 esp->prev_hme_dmacsr |= DMA_BRST64;
279 else if (can_do_burst32)
280 esp->prev_hme_dmacsr |= DMA_BRST32;
281
282 if (can_do_sbus64) {
283 esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
284 sbus_set_sbus64(esp->dev, esp->bursts);
285 }
286
287 lim = 1000;
288 while (dma_read32(DMA_CSR) & DMA_PEND_READ) {
289 if (--lim == 0) {
290 printk(KERN_ALERT PFX "esp%d: DMA_PEND_READ "
291 "will not clear!\n",
292 esp->host->unique_id);
293 break;
294 }
295 udelay(1);
296 }
297
298 dma_write32(0, DMA_CSR);
299 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
300
301 dma_write32(0, DMA_ADDR);
302 break;
303
304 case dvmarev2:
305 if (esp->rev != ESP100) {
306 val = dma_read32(DMA_CSR);
307 dma_write32(val | DMA_3CLKS, DMA_CSR);
308 }
309 break;
310
311 case dvmarev3:
312 val = dma_read32(DMA_CSR);
313 val &= ~DMA_3CLKS;
314 val |= DMA_2CLKS;
315 if (can_do_burst32) {
316 val &= ~DMA_BRST_SZ;
317 val |= DMA_BRST32;
318 }
319 dma_write32(val, DMA_CSR);
320 break;
321
322 case dvmaesc1:
323 val = dma_read32(DMA_CSR);
324 val |= DMA_ADD_ENABLE;
325 val &= ~DMA_BCNT_ENAB;
326 if (!can_do_burst32 && can_do_burst16) {
327 val |= DMA_ESC_BURST;
328 } else {
329 val &= ~(DMA_ESC_BURST);
330 }
331 dma_write32(val, DMA_CSR);
332 break;
333
334 default:
335 break;
336 }
337
338 /* Enable interrupts. */
339 val = dma_read32(DMA_CSR);
340 dma_write32(val | DMA_INT_ENAB, DMA_CSR);
341 }
342
343 static void sbus_esp_dma_drain(struct esp *esp)
344 {
345 u32 csr;
346 int lim;
347
348 if (esp->dma->revision == dvmahme)
349 return;
350
351 csr = dma_read32(DMA_CSR);
352 if (!(csr & DMA_FIFO_ISDRAIN))
353 return;
354
355 if (esp->dma->revision != dvmarev3 && esp->dma->revision != dvmaesc1)
356 dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR);
357
358 lim = 1000;
359 while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) {
360 if (--lim == 0) {
361 printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n",
362 esp->host->unique_id);
363 break;
364 }
365 udelay(1);
366 }
367 }
368
369 static void sbus_esp_dma_invalidate(struct esp *esp)
370 {
371 if (esp->dma->revision == dvmahme) {
372 dma_write32(DMA_RST_SCSI, DMA_CSR);
373
374 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
375 (DMA_PARITY_OFF | DMA_2CLKS |
376 DMA_SCSI_DISAB | DMA_INT_ENAB)) &
377 ~(DMA_ST_WRITE | DMA_ENABLE));
378
379 dma_write32(0, DMA_CSR);
380 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
381
382 /* This is necessary to avoid having the SCSI channel
383 * engine lock up on us.
384 */
385 dma_write32(0, DMA_ADDR);
386 } else {
387 u32 val;
388 int lim;
389
390 lim = 1000;
391 while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) {
392 if (--lim == 0) {
393 printk(KERN_ALERT PFX "esp%d: DMA will not "
394 "invalidate!\n", esp->host->unique_id);
395 break;
396 }
397 udelay(1);
398 }
399
400 val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
401 val |= DMA_FIFO_INV;
402 dma_write32(val, DMA_CSR);
403 val &= ~DMA_FIFO_INV;
404 dma_write32(val, DMA_CSR);
405 }
406 }
407
408 static void sbus_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
409 u32 dma_count, int write, u8 cmd)
410 {
411 u32 csr;
412
413 BUG_ON(!(cmd & ESP_CMD_DMA));
414
415 sbus_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
416 sbus_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
417 if (esp->rev == FASHME) {
418 sbus_esp_write8(esp, (esp_count >> 16) & 0xff, FAS_RLO);
419 sbus_esp_write8(esp, 0, FAS_RHI);
420
421 scsi_esp_cmd(esp, cmd);
422
423 csr = esp->prev_hme_dmacsr;
424 csr |= DMA_SCSI_DISAB | DMA_ENABLE;
425 if (write)
426 csr |= DMA_ST_WRITE;
427 else
428 csr &= ~DMA_ST_WRITE;
429 esp->prev_hme_dmacsr = csr;
430
431 dma_write32(dma_count, DMA_COUNT);
432 dma_write32(addr, DMA_ADDR);
433 dma_write32(csr, DMA_CSR);
434 } else {
435 csr = dma_read32(DMA_CSR);
436 csr |= DMA_ENABLE;
437 if (write)
438 csr |= DMA_ST_WRITE;
439 else
440 csr &= ~DMA_ST_WRITE;
441 dma_write32(csr, DMA_CSR);
442 if (esp->dma->revision == dvmaesc1) {
443 u32 end = PAGE_ALIGN(addr + dma_count + 16U);
444 dma_write32(end - addr, DMA_COUNT);
445 }
446 dma_write32(addr, DMA_ADDR);
447
448 scsi_esp_cmd(esp, cmd);
449 }
450
451 }
452
453 static int sbus_esp_dma_error(struct esp *esp)
454 {
455 u32 csr = dma_read32(DMA_CSR);
456
457 if (csr & DMA_HNDL_ERROR)
458 return 1;
459
460 return 0;
461 }
462
463 static const struct esp_driver_ops sbus_esp_ops = {
464 .esp_write8 = sbus_esp_write8,
465 .esp_read8 = sbus_esp_read8,
466 .map_single = sbus_esp_map_single,
467 .map_sg = sbus_esp_map_sg,
468 .unmap_single = sbus_esp_unmap_single,
469 .unmap_sg = sbus_esp_unmap_sg,
470 .irq_pending = sbus_esp_irq_pending,
471 .reset_dma = sbus_esp_reset_dma,
472 .dma_drain = sbus_esp_dma_drain,
473 .dma_invalidate = sbus_esp_dma_invalidate,
474 .send_dma_cmd = sbus_esp_send_dma_cmd,
475 .dma_error = sbus_esp_dma_error,
476 };
477
478 static int __devinit esp_sbus_probe_one(struct device *dev,
479 struct sbus_dev *esp_dev,
480 struct sbus_dev *espdma,
481 struct sbus_bus *sbus,
482 int hme)
483 {
484 struct scsi_host_template *tpnt = &scsi_esp_template;
485 struct Scsi_Host *host;
486 struct esp *esp;
487 int err;
488
489 host = scsi_host_alloc(tpnt, sizeof(struct esp));
490
491 err = -ENOMEM;
492 if (!host)
493 goto fail;
494
495 host->max_id = (hme ? 16 : 8);
496 esp = host_to_esp(host);
497
498 esp->host = host;
499 esp->dev = esp_dev;
500 esp->ops = &sbus_esp_ops;
501
502 if (hme)
503 esp->flags |= ESP_FLAG_WIDE_CAPABLE;
504
505 err = esp_sbus_find_dma(esp, espdma);
506 if (err < 0)
507 goto fail_unlink;
508
509 err = esp_sbus_map_regs(esp, hme);
510 if (err < 0)
511 goto fail_unlink;
512
513 err = esp_sbus_map_command_block(esp);
514 if (err < 0)
515 goto fail_unmap_regs;
516
517 err = esp_sbus_register_irq(esp);
518 if (err < 0)
519 goto fail_unmap_command_block;
520
521 esp_sbus_get_props(esp, espdma);
522
523 /* Before we try to touch the ESP chip, ESC1 dma can
524 * come up with the reset bit set, so make sure that
525 * is clear first.
526 */
527 if (esp->dma->revision == dvmaesc1) {
528 u32 val = dma_read32(DMA_CSR);
529
530 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
531 }
532
533 dev_set_drvdata(&esp_dev->ofdev.dev, esp);
534
535 err = scsi_esp_register(esp, dev);
536 if (err)
537 goto fail_free_irq;
538
539 return 0;
540
541 fail_free_irq:
542 free_irq(host->irq, esp);
543 fail_unmap_command_block:
544 sbus_free_consistent(esp->dev, 16,
545 esp->command_block,
546 esp->command_block_dma);
547 fail_unmap_regs:
548 sbus_iounmap(esp->regs, SBUS_ESP_REG_SIZE);
549 fail_unlink:
550 scsi_host_put(host);
551 fail:
552 return err;
553 }
554
555 static int __devinit esp_sbus_probe(struct of_device *dev, const struct of_device_id *match)
556 {
557 struct sbus_dev *sdev = to_sbus_device(&dev->dev);
558 struct device_node *dp = dev->node;
559 struct sbus_dev *dma_sdev = NULL;
560 int hme = 0;
561
562 if (dp->parent &&
563 (!strcmp(dp->parent->name, "espdma") ||
564 !strcmp(dp->parent->name, "dma")))
565 dma_sdev = sdev->parent;
566 else if (!strcmp(dp->name, "SUNW,fas")) {
567 dma_sdev = sdev;
568 hme = 1;
569 }
570
571 return esp_sbus_probe_one(&dev->dev, sdev, dma_sdev,
572 sdev->bus, hme);
573 }
574
575 static int __devexit esp_sbus_remove(struct of_device *dev)
576 {
577 struct esp *esp = dev_get_drvdata(&dev->dev);
578 unsigned int irq = esp->host->irq;
579 u32 val;
580
581 scsi_esp_unregister(esp);
582
583 /* Disable interrupts. */
584 val = dma_read32(DMA_CSR);
585 dma_write32(val & ~DMA_INT_ENAB, DMA_CSR);
586
587 free_irq(irq, esp);
588 sbus_free_consistent(esp->dev, 16,
589 esp->command_block,
590 esp->command_block_dma);
591 sbus_iounmap(esp->regs, SBUS_ESP_REG_SIZE);
592
593 scsi_host_put(esp->host);
594
595 return 0;
596 }
597
598 static struct of_device_id esp_match[] = {
599 {
600 .name = "SUNW,esp",
601 },
602 {
603 .name = "SUNW,fas",
604 },
605 {
606 .name = "esp",
607 },
608 {},
609 };
610 MODULE_DEVICE_TABLE(of, esp_match);
611
612 static struct of_platform_driver esp_sbus_driver = {
613 .name = "esp",
614 .match_table = esp_match,
615 .probe = esp_sbus_probe,
616 .remove = __devexit_p(esp_sbus_remove),
617 };
618
619 static int __init sunesp_init(void)
620 {
621 return of_register_driver(&esp_sbus_driver, &sbus_bus_type);
622 }
623
624 static void __exit sunesp_exit(void)
625 {
626 of_unregister_driver(&esp_sbus_driver);
627 }
628
629 MODULE_DESCRIPTION("Sun ESP SCSI driver");
630 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
631 MODULE_LICENSE("GPL");
632 MODULE_VERSION(DRV_VERSION);
633
634 module_init(sunesp_init);
635 module_exit(sunesp_exit);
linux v2.6.22.y-op