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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / drivers / ata / pata_icside.c
blobd7c732042a4fe74775d24d8625d8b7c8e10249b2
1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
4 #include <linux/blkdev.h>
5 #include <linux/gfp.h>
6 #include <scsi/scsi_host.h>
7 #include <linux/ata.h>
8 #include <linux/libata.h>
9
10 #include <asm/dma.h>
11 #include <asm/ecard.h>
12
13 #define DRV_NAME "pata_icside"
14
15 #define ICS_IDENT_OFFSET 0x2280
16
17 #define ICS_ARCIN_V5_INTRSTAT 0x0000
18 #define ICS_ARCIN_V5_INTROFFSET 0x0004
19
20 #define ICS_ARCIN_V6_INTROFFSET_1 0x2200
21 #define ICS_ARCIN_V6_INTRSTAT_1 0x2290
22 #define ICS_ARCIN_V6_INTROFFSET_2 0x3200
23 #define ICS_ARCIN_V6_INTRSTAT_2 0x3290
24
25 struct portinfo {
26 unsigned int dataoffset;
27 unsigned int ctrloffset;
28 unsigned int stepping;
29 };
30
31 static const struct portinfo pata_icside_portinfo_v5 = {
32 .dataoffset = 0x2800,
33 .ctrloffset = 0x2b80,
34 .stepping = 6,
35 };
36
37 static const struct portinfo pata_icside_portinfo_v6_1 = {
38 .dataoffset = 0x2000,
39 .ctrloffset = 0x2380,
40 .stepping = 6,
41 };
42
43 static const struct portinfo pata_icside_portinfo_v6_2 = {
44 .dataoffset = 0x3000,
45 .ctrloffset = 0x3380,
46 .stepping = 6,
47 };
48
49 struct pata_icside_state {
50 void __iomem *irq_port;
51 void __iomem *ioc_base;
52 unsigned int type;
53 unsigned int dma;
54 struct {
55 u8 port_sel;
56 u8 disabled;
57 unsigned int speed[ATA_MAX_DEVICES];
58 } port[2];
59 };
60
61 struct pata_icside_info {
62 struct pata_icside_state *state;
63 struct expansion_card *ec;
64 void __iomem *base;
65 void __iomem *irqaddr;
66 unsigned int irqmask;
67 const expansioncard_ops_t *irqops;
68 unsigned int mwdma_mask;
69 unsigned int nr_ports;
70 const struct portinfo *port[2];
71 unsigned long raw_base;
72 unsigned long raw_ioc_base;
73 };
74
75 #define ICS_TYPE_A3IN 0
76 #define ICS_TYPE_A3USER 1
77 #define ICS_TYPE_V6 3
78 #define ICS_TYPE_V5 15
79 #define ICS_TYPE_NOTYPE ((unsigned int)-1)
80
81 /* ---------------- Version 5 PCB Support Functions --------------------- */
82 /* Prototype: pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
83 * Purpose : enable interrupts from card
84 */
85 static void pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
86 {
87 struct pata_icside_state *state = ec->irq_data;
88
89 writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET);
90 }
91
92 /* Prototype: pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
93 * Purpose : disable interrupts from card
94 */
95 static void pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
96 {
97 struct pata_icside_state *state = ec->irq_data;
98
99 readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET);
100 }
101
102 static const expansioncard_ops_t pata_icside_ops_arcin_v5 = {
103 .irqenable = pata_icside_irqenable_arcin_v5,
104 .irqdisable = pata_icside_irqdisable_arcin_v5,
105 };
106
107
108 /* ---------------- Version 6 PCB Support Functions --------------------- */
109 /* Prototype: pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
110 * Purpose : enable interrupts from card
111 */
112 static void pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
113 {
114 struct pata_icside_state *state = ec->irq_data;
115 void __iomem *base = state->irq_port;
116
117 if (!state->port[0].disabled)
118 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1);
119 if (!state->port[1].disabled)
120 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2);
121 }
122
123 /* Prototype: pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
124 * Purpose : disable interrupts from card
125 */
126 static void pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
127 {
128 struct pata_icside_state *state = ec->irq_data;
129
130 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
131 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
132 }
133
134 /* Prototype: pata_icside_irqprobe(struct expansion_card *ec)
135 * Purpose : detect an active interrupt from card
136 */
137 static int pata_icside_irqpending_arcin_v6(struct expansion_card *ec)
138 {
139 struct pata_icside_state *state = ec->irq_data;
140
141 return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 ||
142 readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1;
143 }
144
145 static const expansioncard_ops_t pata_icside_ops_arcin_v6 = {
146 .irqenable = pata_icside_irqenable_arcin_v6,
147 .irqdisable = pata_icside_irqdisable_arcin_v6,
148 .irqpending = pata_icside_irqpending_arcin_v6,
149 };
150
151
152 /*
153 * SG-DMA support.
154 *
155 * Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers.
156 * There is only one DMA controller per card, which means that only
157 * one drive can be accessed at one time. NOTE! We do not enforce that
158 * here, but we rely on the main IDE driver spotting that both
159 * interfaces use the same IRQ, which should guarantee this.
160 */
161
162 /*
163 * Configure the IOMD to give the appropriate timings for the transfer
164 * mode being requested. We take the advice of the ATA standards, and
165 * calculate the cycle time based on the transfer mode, and the EIDE
166 * MW DMA specs that the drive provides in the IDENTIFY command.
167 *
168 * We have the following IOMD DMA modes to choose from:
169 *
170 * Type Active Recovery Cycle
171 * A 250 (250) 312 (550) 562 (800)
172 * B 187 (200) 250 (550) 437 (750)
173 * C 125 (125) 125 (375) 250 (500)
174 * D 62 (50) 125 (375) 187 (425)
175 *
176 * (figures in brackets are actual measured timings on DIOR/DIOW)
177 *
178 * However, we also need to take care of the read/write active and
179 * recovery timings:
180 *
181 * Read Write
182 * Mode Active -- Recovery -- Cycle IOMD type
183 * MW0 215 50 215 480 A
184 * MW1 80 50 50 150 C
185 * MW2 70 25 25 120 C
186 */
187 static void pata_icside_set_dmamode(struct ata_port *ap, struct ata_device *adev)
188 {
189 struct pata_icside_state *state = ap->host->private_data;
190 struct ata_timing t;
191 unsigned int cycle;
192 char iomd_type;
193
194 /*
195 * DMA is based on a 16MHz clock
196 */
197 if (ata_timing_compute(adev, adev->dma_mode, &t, 1000, 1))
198 return;
199
200 /*
201 * Choose the IOMD cycle timing which ensure that the interface
202 * satisfies the measured active, recovery and cycle times.
203 */
204 if (t.active <= 50 && t.recover <= 375 && t.cycle <= 425)
205 iomd_type = 'D', cycle = 187;
206 else if (t.active <= 125 && t.recover <= 375 && t.cycle <= 500)
207 iomd_type = 'C', cycle = 250;
208 else if (t.active <= 200 && t.recover <= 550 && t.cycle <= 750)
209 iomd_type = 'B', cycle = 437;
210 else
211 iomd_type = 'A', cycle = 562;
212
213 ata_dev_info(adev, "timings: act %dns rec %dns cyc %dns (%c)\n",
214 t.active, t.recover, t.cycle, iomd_type);
215
216 state->port[ap->port_no].speed[adev->devno] = cycle;
217 }
218
219 static void pata_icside_bmdma_setup(struct ata_queued_cmd *qc)
220 {
221 struct ata_port *ap = qc->ap;
222 struct pata_icside_state *state = ap->host->private_data;
223 unsigned int write = qc->tf.flags & ATA_TFLAG_WRITE;
224
225 /*
226 * We are simplex; BUG if we try to fiddle with DMA
227 * while it's active.
228 */
229 BUG_ON(dma_channel_active(state->dma));
230
231 /*
232 * Route the DMA signals to the correct interface
233 */
234 writeb(state->port[ap->port_no].port_sel, state->ioc_base);
235
236 set_dma_speed(state->dma, state->port[ap->port_no].speed[qc->dev->devno]);
237 set_dma_sg(state->dma, qc->sg, qc->n_elem);
238 set_dma_mode(state->dma, write ? DMA_MODE_WRITE : DMA_MODE_READ);
239
240 /* issue r/w command */
241 ap->ops->sff_exec_command(ap, &qc->tf);
242 }
243
244 static void pata_icside_bmdma_start(struct ata_queued_cmd *qc)
245 {
246 struct ata_port *ap = qc->ap;
247 struct pata_icside_state *state = ap->host->private_data;
248
249 BUG_ON(dma_channel_active(state->dma));
250 enable_dma(state->dma);
251 }
252
253 static void pata_icside_bmdma_stop(struct ata_queued_cmd *qc)
254 {
255 struct ata_port *ap = qc->ap;
256 struct pata_icside_state *state = ap->host->private_data;
257
258 disable_dma(state->dma);
259
260 /* see ata_bmdma_stop */
261 ata_sff_dma_pause(ap);
262 }
263
264 static u8 pata_icside_bmdma_status(struct ata_port *ap)
265 {
266 struct pata_icside_state *state = ap->host->private_data;
267 void __iomem *irq_port;
268
269 irq_port = state->irq_port + (ap->port_no ? ICS_ARCIN_V6_INTRSTAT_2 :
270 ICS_ARCIN_V6_INTRSTAT_1);
271
272 return readb(irq_port) & 1 ? ATA_DMA_INTR : 0;
273 }
274
275 static int icside_dma_init(struct pata_icside_info *info)
276 {
277 struct pata_icside_state *state = info->state;
278 struct expansion_card *ec = info->ec;
279 int i;
280
281 for (i = 0; i < ATA_MAX_DEVICES; i++) {
282 state->port[0].speed[i] = 480;
283 state->port[1].speed[i] = 480;
284 }
285
286 if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) {
287 state->dma = ec->dma;
288 info->mwdma_mask = ATA_MWDMA2;
289 }
290
291 return 0;
292 }
293
294
295 static struct scsi_host_template pata_icside_sht = {
296 ATA_BASE_SHT(DRV_NAME),
297 .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
298 .dma_boundary = IOMD_DMA_BOUNDARY,
299 };
300
301 static void pata_icside_postreset(struct ata_link *link, unsigned int *classes)
302 {
303 struct ata_port *ap = link->ap;
304 struct pata_icside_state *state = ap->host->private_data;
305
306 if (classes[0] != ATA_DEV_NONE || classes[1] != ATA_DEV_NONE)
307 return ata_sff_postreset(link, classes);
308
309 state->port[ap->port_no].disabled = 1;
310
311 if (state->type == ICS_TYPE_V6) {
312 /*
313 * Disable interrupts from this port, otherwise we
314 * receive spurious interrupts from the floating
315 * interrupt line.
316 */
317 void __iomem *irq_port = state->irq_port +
318 (ap->port_no ? ICS_ARCIN_V6_INTROFFSET_2 : ICS_ARCIN_V6_INTROFFSET_1);
319 readb(irq_port);
320 }
321 }
322
323 static struct ata_port_operations pata_icside_port_ops = {
324 .inherits = &ata_bmdma_port_ops,
325 /* no need to build any PRD tables for DMA */
326 .qc_prep = ata_noop_qc_prep,
327 .sff_data_xfer = ata_sff_data_xfer_noirq,
328 .bmdma_setup = pata_icside_bmdma_setup,
329 .bmdma_start = pata_icside_bmdma_start,
330 .bmdma_stop = pata_icside_bmdma_stop,
331 .bmdma_status = pata_icside_bmdma_status,
332
333 .cable_detect = ata_cable_40wire,
334 .set_dmamode = pata_icside_set_dmamode,
335 .postreset = pata_icside_postreset,
336
337 .port_start = ATA_OP_NULL, /* don't need PRD table */
338 };
339
340 static void pata_icside_setup_ioaddr(struct ata_port *ap, void __iomem *base,
341 struct pata_icside_info *info,
342 const struct portinfo *port)
343 {
344 struct ata_ioports *ioaddr = &ap->ioaddr;
345 void __iomem *cmd = base + port->dataoffset;
346
347 ioaddr->cmd_addr = cmd;
348 ioaddr->data_addr = cmd + (ATA_REG_DATA << port->stepping);
349 ioaddr->error_addr = cmd + (ATA_REG_ERR << port->stepping);
350 ioaddr->feature_addr = cmd + (ATA_REG_FEATURE << port->stepping);
351 ioaddr->nsect_addr = cmd + (ATA_REG_NSECT << port->stepping);
352 ioaddr->lbal_addr = cmd + (ATA_REG_LBAL << port->stepping);
353 ioaddr->lbam_addr = cmd + (ATA_REG_LBAM << port->stepping);
354 ioaddr->lbah_addr = cmd + (ATA_REG_LBAH << port->stepping);
355 ioaddr->device_addr = cmd + (ATA_REG_DEVICE << port->stepping);
356 ioaddr->status_addr = cmd + (ATA_REG_STATUS << port->stepping);
357 ioaddr->command_addr = cmd + (ATA_REG_CMD << port->stepping);
358
359 ioaddr->ctl_addr = base + port->ctrloffset;
360 ioaddr->altstatus_addr = ioaddr->ctl_addr;
361
362 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
363 info->raw_base + port->dataoffset,
364 info->raw_base + port->ctrloffset);
365
366 if (info->raw_ioc_base)
367 ata_port_desc(ap, "iocbase 0x%lx", info->raw_ioc_base);
368 }
369
370 static int pata_icside_register_v5(struct pata_icside_info *info)
371 {
372 struct pata_icside_state *state = info->state;
373 void __iomem *base;
374
375 base = ecardm_iomap(info->ec, ECARD_RES_MEMC, 0, 0);
376 if (!base)
377 return -ENOMEM;
378
379 state->irq_port = base;
380
381 info->base = base;
382 info->irqaddr = base + ICS_ARCIN_V5_INTRSTAT;
383 info->irqmask = 1;
384 info->irqops = &pata_icside_ops_arcin_v5;
385 info->nr_ports = 1;
386 info->port[0] = &pata_icside_portinfo_v5;
387
388 info->raw_base = ecard_resource_start(info->ec, ECARD_RES_MEMC);
389
390 return 0;
391 }
392
393 static int pata_icside_register_v6(struct pata_icside_info *info)
394 {
395 struct pata_icside_state *state = info->state;
396 struct expansion_card *ec = info->ec;
397 void __iomem *ioc_base, *easi_base;
398 unsigned int sel = 0;
399
400 ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
401 if (!ioc_base)
402 return -ENOMEM;
403
404 easi_base = ioc_base;
405
406 if (ecard_resource_flags(ec, ECARD_RES_EASI)) {
407 easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0);
408 if (!easi_base)
409 return -ENOMEM;
410
411 /*
412 * Enable access to the EASI region.
413 */
414 sel = 1 << 5;
415 }
416
417 writeb(sel, ioc_base);
418
419 state->irq_port = easi_base;
420 state->ioc_base = ioc_base;
421 state->port[0].port_sel = sel;
422 state->port[1].port_sel = sel | 1;
423
424 info->base = easi_base;
425 info->irqops = &pata_icside_ops_arcin_v6;
426 info->nr_ports = 2;
427 info->port[0] = &pata_icside_portinfo_v6_1;
428 info->port[1] = &pata_icside_portinfo_v6_2;
429
430 info->raw_base = ecard_resource_start(ec, ECARD_RES_EASI);
431 info->raw_ioc_base = ecard_resource_start(ec, ECARD_RES_IOCFAST);
432
433 return icside_dma_init(info);
434 }
435
436 static int pata_icside_add_ports(struct pata_icside_info *info)
437 {
438 struct expansion_card *ec = info->ec;
439 struct ata_host *host;
440 int i;
441
442 if (info->irqaddr) {
443 ec->irqaddr = info->irqaddr;
444 ec->irqmask = info->irqmask;
445 }
446 if (info->irqops)
447 ecard_setirq(ec, info->irqops, info->state);
448
449 /*
450 * Be on the safe side - disable interrupts
451 */
452 ec->ops->irqdisable(ec, ec->irq);
453
454 host = ata_host_alloc(&ec->dev, info->nr_ports);
455 if (!host)
456 return -ENOMEM;
457
458 host->private_data = info->state;
459 host->flags = ATA_HOST_SIMPLEX;
460
461 for (i = 0; i < info->nr_ports; i++) {
462 struct ata_port *ap = host->ports[i];
463
464 ap->pio_mask = ATA_PIO4;
465 ap->mwdma_mask = info->mwdma_mask;
466 ap->flags |= ATA_FLAG_SLAVE_POSS;
467 ap->ops = &pata_icside_port_ops;
468
469 pata_icside_setup_ioaddr(ap, info->base, info, info->port[i]);
470 }
471
472 return ata_host_activate(host, ec->irq, ata_bmdma_interrupt, 0,
473 &pata_icside_sht);
474 }
475
476 static int pata_icside_probe(struct expansion_card *ec,
477 const struct ecard_id *id)
478 {
479 struct pata_icside_state *state;
480 struct pata_icside_info info;
481 void __iomem *idmem;
482 int ret;
483
484 ret = ecard_request_resources(ec);
485 if (ret)
486 goto out;
487
488 state = devm_kzalloc(&ec->dev, sizeof(*state), GFP_KERNEL);
489 if (!state) {
490 ret = -ENOMEM;
491 goto release;
492 }
493
494 state->type = ICS_TYPE_NOTYPE;
495 state->dma = NO_DMA;
496
497 idmem = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
498 if (idmem) {
499 unsigned int type;
500
501 type = readb(idmem + ICS_IDENT_OFFSET) & 1;
502 type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1;
503 type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2;
504 type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3;
505 ecardm_iounmap(ec, idmem);
506
507 state->type = type;
508 }
509
510 memset(&info, 0, sizeof(info));
511 info.state = state;
512 info.ec = ec;
513
514 switch (state->type) {
515 case ICS_TYPE_A3IN:
516 dev_warn(&ec->dev, "A3IN unsupported\n");
517 ret = -ENODEV;
518 break;
519
520 case ICS_TYPE_A3USER:
521 dev_warn(&ec->dev, "A3USER unsupported\n");
522 ret = -ENODEV;
523 break;
524
525 case ICS_TYPE_V5:
526 ret = pata_icside_register_v5(&info);
527 break;
528
529 case ICS_TYPE_V6:
530 ret = pata_icside_register_v6(&info);
531 break;
532
533 default:
534 dev_warn(&ec->dev, "unknown interface type\n");
535 ret = -ENODEV;
536 break;
537 }
538
539 if (ret == 0)
540 ret = pata_icside_add_ports(&info);
541
542 if (ret == 0)
543 goto out;
544
545 release:
546 ecard_release_resources(ec);
547 out:
548 return ret;
549 }
550
551 static void pata_icside_shutdown(struct expansion_card *ec)
552 {
553 struct ata_host *host = ecard_get_drvdata(ec);
554 unsigned long flags;
555
556 /*
557 * Disable interrupts from this card. We need to do
558 * this before disabling EASI since we may be accessing
559 * this register via that region.
560 */
561 local_irq_save(flags);
562 ec->ops->irqdisable(ec, ec->irq);
563 local_irq_restore(flags);
564
565 /*
566 * Reset the ROM pointer so that we can read the ROM
567 * after a soft reboot. This also disables access to
568 * the IDE taskfile via the EASI region.
569 */
570 if (host) {
571 struct pata_icside_state *state = host->private_data;
572 if (state->ioc_base)
573 writeb(0, state->ioc_base);
574 }
575 }
576
577 static void pata_icside_remove(struct expansion_card *ec)
578 {
579 struct ata_host *host = ecard_get_drvdata(ec);
580 struct pata_icside_state *state = host->private_data;
581
582 ata_host_detach(host);
583
584 pata_icside_shutdown(ec);
585
586 /*
587 * don't NULL out the drvdata - devres/libata wants it
588 * to free the ata_host structure.
589 */
590 if (state->dma != NO_DMA)
591 free_dma(state->dma);
592
593 ecard_release_resources(ec);
594 }
595
596 static const struct ecard_id pata_icside_ids[] = {
597 { MANU_ICS, PROD_ICS_IDE },
598 { MANU_ICS2, PROD_ICS2_IDE },
599 { 0xffff, 0xffff }
600 };
601
602 static struct ecard_driver pata_icside_driver = {
603 .probe = pata_icside_probe,
604 .remove = pata_icside_remove,
605 .shutdown = pata_icside_shutdown,
606 .id_table = pata_icside_ids,
607 .drv = {
608 .name = DRV_NAME,
609 },
610 };
611
612 static int __init pata_icside_init(void)
613 {
614 return ecard_register_driver(&pata_icside_driver);
615 }
616
617 static void __exit pata_icside_exit(void)
618 {
619 ecard_remove_driver(&pata_icside_driver);
620 }
621
622 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
623 MODULE_LICENSE("GPL");
624 MODULE_DESCRIPTION("ICS PATA driver");
625
626 module_init(pata_icside_init);
627 module_exit(pata_icside_exit);
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