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ocfs2: avoid inode removal while nfsd is accessing it
[linux/fpc-iii.git] / drivers / ata / pata_icside.c
blob08543aeb009398ccd2261173a622ca7803818011
1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/kernel.h>
3 #include <linux/module.h>
4 #include <linux/init.h>
5 #include <linux/blkdev.h>
6 #include <linux/gfp.h>
7 #include <scsi/scsi_host.h>
8 #include <linux/ata.h>
9 #include <linux/libata.h>
10
11 #include <asm/dma.h>
12 #include <asm/ecard.h>
13
14 #define DRV_NAME "pata_icside"
15
16 #define ICS_IDENT_OFFSET 0x2280
17
18 #define ICS_ARCIN_V5_INTRSTAT 0x0000
19 #define ICS_ARCIN_V5_INTROFFSET 0x0004
20
21 #define ICS_ARCIN_V6_INTROFFSET_1 0x2200
22 #define ICS_ARCIN_V6_INTRSTAT_1 0x2290
23 #define ICS_ARCIN_V6_INTROFFSET_2 0x3200
24 #define ICS_ARCIN_V6_INTRSTAT_2 0x3290
25
26 struct portinfo {
27 unsigned int dataoffset;
28 unsigned int ctrloffset;
29 unsigned int stepping;
30 };
31
32 static const struct portinfo pata_icside_portinfo_v5 = {
33 .dataoffset = 0x2800,
34 .ctrloffset = 0x2b80,
35 .stepping = 6,
36 };
37
38 static const struct portinfo pata_icside_portinfo_v6_1 = {
39 .dataoffset = 0x2000,
40 .ctrloffset = 0x2380,
41 .stepping = 6,
42 };
43
44 static const struct portinfo pata_icside_portinfo_v6_2 = {
45 .dataoffset = 0x3000,
46 .ctrloffset = 0x3380,
47 .stepping = 6,
48 };
49
50 struct pata_icside_state {
51 void __iomem *irq_port;
52 void __iomem *ioc_base;
53 unsigned int type;
54 unsigned int dma;
55 struct {
56 u8 port_sel;
57 u8 disabled;
58 unsigned int speed[ATA_MAX_DEVICES];
59 } port[2];
60 };
61
62 struct pata_icside_info {
63 struct pata_icside_state *state;
64 struct expansion_card *ec;
65 void __iomem *base;
66 void __iomem *irqaddr;
67 unsigned int irqmask;
68 const expansioncard_ops_t *irqops;
69 unsigned int mwdma_mask;
70 unsigned int nr_ports;
71 const struct portinfo *port[2];
72 unsigned long raw_base;
73 unsigned long raw_ioc_base;
74 };
75
76 #define ICS_TYPE_A3IN 0
77 #define ICS_TYPE_A3USER 1
78 #define ICS_TYPE_V6 3
79 #define ICS_TYPE_V5 15
80 #define ICS_TYPE_NOTYPE ((unsigned int)-1)
81
82 /* ---------------- Version 5 PCB Support Functions --------------------- */
83 /* Prototype: pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
84 * Purpose : enable interrupts from card
85 */
86 static void pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
87 {
88 struct pata_icside_state *state = ec->irq_data;
89
90 writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET);
91 }
92
93 /* Prototype: pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
94 * Purpose : disable interrupts from card
95 */
96 static void pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
97 {
98 struct pata_icside_state *state = ec->irq_data;
99
100 readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET);
101 }
102
103 static const expansioncard_ops_t pata_icside_ops_arcin_v5 = {
104 .irqenable = pata_icside_irqenable_arcin_v5,
105 .irqdisable = pata_icside_irqdisable_arcin_v5,
106 };
107
108
109 /* ---------------- Version 6 PCB Support Functions --------------------- */
110 /* Prototype: pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
111 * Purpose : enable interrupts from card
112 */
113 static void pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
114 {
115 struct pata_icside_state *state = ec->irq_data;
116 void __iomem *base = state->irq_port;
117
118 if (!state->port[0].disabled)
119 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1);
120 if (!state->port[1].disabled)
121 writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2);
122 }
123
124 /* Prototype: pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
125 * Purpose : disable interrupts from card
126 */
127 static void pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
128 {
129 struct pata_icside_state *state = ec->irq_data;
130
131 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
132 readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
133 }
134
135 /* Prototype: pata_icside_irqprobe(struct expansion_card *ec)
136 * Purpose : detect an active interrupt from card
137 */
138 static int pata_icside_irqpending_arcin_v6(struct expansion_card *ec)
139 {
140 struct pata_icside_state *state = ec->irq_data;
141
142 return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 ||
143 readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1;
144 }
145
146 static const expansioncard_ops_t pata_icside_ops_arcin_v6 = {
147 .irqenable = pata_icside_irqenable_arcin_v6,
148 .irqdisable = pata_icside_irqdisable_arcin_v6,
149 .irqpending = pata_icside_irqpending_arcin_v6,
150 };
151
152
153 /*
154 * SG-DMA support.
155 *
156 * Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers.
157 * There is only one DMA controller per card, which means that only
158 * one drive can be accessed at one time. NOTE! We do not enforce that
159 * here, but we rely on the main IDE driver spotting that both
160 * interfaces use the same IRQ, which should guarantee this.
161 */
162
163 /*
164 * Configure the IOMD to give the appropriate timings for the transfer
165 * mode being requested. We take the advice of the ATA standards, and
166 * calculate the cycle time based on the transfer mode, and the EIDE
167 * MW DMA specs that the drive provides in the IDENTIFY command.
168 *
169 * We have the following IOMD DMA modes to choose from:
170 *
171 * Type Active Recovery Cycle
172 * A 250 (250) 312 (550) 562 (800)
173 * B 187 (200) 250 (550) 437 (750)
174 * C 125 (125) 125 (375) 250 (500)
175 * D 62 (50) 125 (375) 187 (425)
176 *
177 * (figures in brackets are actual measured timings on DIOR/DIOW)
178 *
179 * However, we also need to take care of the read/write active and
180 * recovery timings:
181 *
182 * Read Write
183 * Mode Active -- Recovery -- Cycle IOMD type
184 * MW0 215 50 215 480 A
185 * MW1 80 50 50 150 C
186 * MW2 70 25 25 120 C
187 */
188 static void pata_icside_set_dmamode(struct ata_port *ap, struct ata_device *adev)
189 {
190 struct pata_icside_state *state = ap->host->private_data;
191 struct ata_timing t;
192 unsigned int cycle;
193 char iomd_type;
194
195 /*
196 * DMA is based on a 16MHz clock
197 */
198 if (ata_timing_compute(adev, adev->dma_mode, &t, 1000, 1))
199 return;
200
201 /*
202 * Choose the IOMD cycle timing which ensure that the interface
203 * satisfies the measured active, recovery and cycle times.
204 */
205 if (t.active <= 50 && t.recover <= 375 && t.cycle <= 425)
206 iomd_type = 'D', cycle = 187;
207 else if (t.active <= 125 && t.recover <= 375 && t.cycle <= 500)
208 iomd_type = 'C', cycle = 250;
209 else if (t.active <= 200 && t.recover <= 550 && t.cycle <= 750)
210 iomd_type = 'B', cycle = 437;
211 else
212 iomd_type = 'A', cycle = 562;
213
214 ata_dev_info(adev, "timings: act %dns rec %dns cyc %dns (%c)\n",
215 t.active, t.recover, t.cycle, iomd_type);
216
217 state->port[ap->port_no].speed[adev->devno] = cycle;
218 }
219
220 static void pata_icside_bmdma_setup(struct ata_queued_cmd *qc)
221 {
222 struct ata_port *ap = qc->ap;
223 struct pata_icside_state *state = ap->host->private_data;
224 unsigned int write = qc->tf.flags & ATA_TFLAG_WRITE;
225
226 /*
227 * We are simplex; BUG if we try to fiddle with DMA
228 * while it's active.
229 */
230 BUG_ON(dma_channel_active(state->dma));
231
232 /*
233 * Route the DMA signals to the correct interface
234 */
235 writeb(state->port[ap->port_no].port_sel, state->ioc_base);
236
237 set_dma_speed(state->dma, state->port[ap->port_no].speed[qc->dev->devno]);
238 set_dma_sg(state->dma, qc->sg, qc->n_elem);
239 set_dma_mode(state->dma, write ? DMA_MODE_WRITE : DMA_MODE_READ);
240
241 /* issue r/w command */
242 ap->ops->sff_exec_command(ap, &qc->tf);
243 }
244
245 static void pata_icside_bmdma_start(struct ata_queued_cmd *qc)
246 {
247 struct ata_port *ap = qc->ap;
248 struct pata_icside_state *state = ap->host->private_data;
249
250 BUG_ON(dma_channel_active(state->dma));
251 enable_dma(state->dma);
252 }
253
254 static void pata_icside_bmdma_stop(struct ata_queued_cmd *qc)
255 {
256 struct ata_port *ap = qc->ap;
257 struct pata_icside_state *state = ap->host->private_data;
258
259 disable_dma(state->dma);
260
261 /* see ata_bmdma_stop */
262 ata_sff_dma_pause(ap);
263 }
264
265 static u8 pata_icside_bmdma_status(struct ata_port *ap)
266 {
267 struct pata_icside_state *state = ap->host->private_data;
268 void __iomem *irq_port;
269
270 irq_port = state->irq_port + (ap->port_no ? ICS_ARCIN_V6_INTRSTAT_2 :
271 ICS_ARCIN_V6_INTRSTAT_1);
272
273 return readb(irq_port) & 1 ? ATA_DMA_INTR : 0;
274 }
275
276 static int icside_dma_init(struct pata_icside_info *info)
277 {
278 struct pata_icside_state *state = info->state;
279 struct expansion_card *ec = info->ec;
280 int i;
281
282 for (i = 0; i < ATA_MAX_DEVICES; i++) {
283 state->port[0].speed[i] = 480;
284 state->port[1].speed[i] = 480;
285 }
286
287 if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) {
288 state->dma = ec->dma;
289 info->mwdma_mask = ATA_MWDMA2;
290 }
291
292 return 0;
293 }
294
295
296 static struct scsi_host_template pata_icside_sht = {
297 ATA_BASE_SHT(DRV_NAME),
298 .sg_tablesize = SG_MAX_SEGMENTS,
299 .dma_boundary = IOMD_DMA_BOUNDARY,
300 };
301
302 static void pata_icside_postreset(struct ata_link *link, unsigned int *classes)
303 {
304 struct ata_port *ap = link->ap;
305 struct pata_icside_state *state = ap->host->private_data;
306
307 if (classes[0] != ATA_DEV_NONE || classes[1] != ATA_DEV_NONE)
308 return ata_sff_postreset(link, classes);
309
310 state->port[ap->port_no].disabled = 1;
311
312 if (state->type == ICS_TYPE_V6) {
313 /*
314 * Disable interrupts from this port, otherwise we
315 * receive spurious interrupts from the floating
316 * interrupt line.
317 */
318 void __iomem *irq_port = state->irq_port +
319 (ap->port_no ? ICS_ARCIN_V6_INTROFFSET_2 : ICS_ARCIN_V6_INTROFFSET_1);
320 readb(irq_port);
321 }
322 }
323
324 static struct ata_port_operations pata_icside_port_ops = {
325 .inherits = &ata_bmdma_port_ops,
326 /* no need to build any PRD tables for DMA */
327 .qc_prep = ata_noop_qc_prep,
328 .sff_data_xfer = ata_sff_data_xfer32,
329 .bmdma_setup = pata_icside_bmdma_setup,
330 .bmdma_start = pata_icside_bmdma_start,
331 .bmdma_stop = pata_icside_bmdma_stop,
332 .bmdma_status = pata_icside_bmdma_status,
333
334 .cable_detect = ata_cable_40wire,
335 .set_dmamode = pata_icside_set_dmamode,
336 .postreset = pata_icside_postreset,
337
338 .port_start = ATA_OP_NULL, /* don't need PRD table */
339 };
340
341 static void pata_icside_setup_ioaddr(struct ata_port *ap, void __iomem *base,
342 struct pata_icside_info *info,
343 const struct portinfo *port)
344 {
345 struct ata_ioports *ioaddr = &ap->ioaddr;
346 void __iomem *cmd = base + port->dataoffset;
347
348 ioaddr->cmd_addr = cmd;
349 ioaddr->data_addr = cmd + (ATA_REG_DATA << port->stepping);
350 ioaddr->error_addr = cmd + (ATA_REG_ERR << port->stepping);
351 ioaddr->feature_addr = cmd + (ATA_REG_FEATURE << port->stepping);
352 ioaddr->nsect_addr = cmd + (ATA_REG_NSECT << port->stepping);
353 ioaddr->lbal_addr = cmd + (ATA_REG_LBAL << port->stepping);
354 ioaddr->lbam_addr = cmd + (ATA_REG_LBAM << port->stepping);
355 ioaddr->lbah_addr = cmd + (ATA_REG_LBAH << port->stepping);
356 ioaddr->device_addr = cmd + (ATA_REG_DEVICE << port->stepping);
357 ioaddr->status_addr = cmd + (ATA_REG_STATUS << port->stepping);
358 ioaddr->command_addr = cmd + (ATA_REG_CMD << port->stepping);
359
360 ioaddr->ctl_addr = base + port->ctrloffset;
361 ioaddr->altstatus_addr = ioaddr->ctl_addr;
362
363 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
364 info->raw_base + port->dataoffset,
365 info->raw_base + port->ctrloffset);
366
367 if (info->raw_ioc_base)
368 ata_port_desc(ap, "iocbase 0x%lx", info->raw_ioc_base);
369 }
370
371 static int pata_icside_register_v5(struct pata_icside_info *info)
372 {
373 struct pata_icside_state *state = info->state;
374 void __iomem *base;
375
376 base = ecardm_iomap(info->ec, ECARD_RES_MEMC, 0, 0);
377 if (!base)
378 return -ENOMEM;
379
380 state->irq_port = base;
381
382 info->base = base;
383 info->irqaddr = base + ICS_ARCIN_V5_INTRSTAT;
384 info->irqmask = 1;
385 info->irqops = &pata_icside_ops_arcin_v5;
386 info->nr_ports = 1;
387 info->port[0] = &pata_icside_portinfo_v5;
388
389 info->raw_base = ecard_resource_start(info->ec, ECARD_RES_MEMC);
390
391 return 0;
392 }
393
394 static int pata_icside_register_v6(struct pata_icside_info *info)
395 {
396 struct pata_icside_state *state = info->state;
397 struct expansion_card *ec = info->ec;
398 void __iomem *ioc_base, *easi_base;
399 unsigned int sel = 0;
400
401 ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
402 if (!ioc_base)
403 return -ENOMEM;
404
405 easi_base = ioc_base;
406
407 if (ecard_resource_flags(ec, ECARD_RES_EASI)) {
408 easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0);
409 if (!easi_base)
410 return -ENOMEM;
411
412 /*
413 * Enable access to the EASI region.
414 */
415 sel = 1 << 5;
416 }
417
418 writeb(sel, ioc_base);
419
420 state->irq_port = easi_base;
421 state->ioc_base = ioc_base;
422 state->port[0].port_sel = sel;
423 state->port[1].port_sel = sel | 1;
424
425 info->base = easi_base;
426 info->irqops = &pata_icside_ops_arcin_v6;
427 info->nr_ports = 2;
428 info->port[0] = &pata_icside_portinfo_v6_1;
429 info->port[1] = &pata_icside_portinfo_v6_2;
430
431 info->raw_base = ecard_resource_start(ec, ECARD_RES_EASI);
432 info->raw_ioc_base = ecard_resource_start(ec, ECARD_RES_IOCFAST);
433
434 return icside_dma_init(info);
435 }
436
437 static int pata_icside_add_ports(struct pata_icside_info *info)
438 {
439 struct expansion_card *ec = info->ec;
440 struct ata_host *host;
441 int i;
442
443 if (info->irqaddr) {
444 ec->irqaddr = info->irqaddr;
445 ec->irqmask = info->irqmask;
446 }
447 if (info->irqops)
448 ecard_setirq(ec, info->irqops, info->state);
449
450 /*
451 * Be on the safe side - disable interrupts
452 */
453 ec->ops->irqdisable(ec, ec->irq);
454
455 host = ata_host_alloc(&ec->dev, info->nr_ports);
456 if (!host)
457 return -ENOMEM;
458
459 host->private_data = info->state;
460 host->flags = ATA_HOST_SIMPLEX;
461
462 for (i = 0; i < info->nr_ports; i++) {
463 struct ata_port *ap = host->ports[i];
464
465 ap->pio_mask = ATA_PIO4;
466 ap->mwdma_mask = info->mwdma_mask;
467 ap->flags |= ATA_FLAG_SLAVE_POSS;
468 ap->ops = &pata_icside_port_ops;
469
470 pata_icside_setup_ioaddr(ap, info->base, info, info->port[i]);
471 }
472
473 return ata_host_activate(host, ec->irq, ata_bmdma_interrupt, 0,
474 &pata_icside_sht);
475 }
476
477 static int pata_icside_probe(struct expansion_card *ec,
478 const struct ecard_id *id)
479 {
480 struct pata_icside_state *state;
481 struct pata_icside_info info;
482 void __iomem *idmem;
483 int ret;
484
485 ret = ecard_request_resources(ec);
486 if (ret)
487 goto out;
488
489 state = devm_kzalloc(&ec->dev, sizeof(*state), GFP_KERNEL);
490 if (!state) {
491 ret = -ENOMEM;
492 goto release;
493 }
494
495 state->type = ICS_TYPE_NOTYPE;
496 state->dma = NO_DMA;
497
498 idmem = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
499 if (idmem) {
500 unsigned int type;
501
502 type = readb(idmem + ICS_IDENT_OFFSET) & 1;
503 type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1;
504 type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2;
505 type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3;
506 ecardm_iounmap(ec, idmem);
507
508 state->type = type;
509 }
510
511 memset(&info, 0, sizeof(info));
512 info.state = state;
513 info.ec = ec;
514
515 switch (state->type) {
516 case ICS_TYPE_A3IN:
517 dev_warn(&ec->dev, "A3IN unsupported\n");
518 ret = -ENODEV;
519 break;
520
521 case ICS_TYPE_A3USER:
522 dev_warn(&ec->dev, "A3USER unsupported\n");
523 ret = -ENODEV;
524 break;
525
526 case ICS_TYPE_V5:
527 ret = pata_icside_register_v5(&info);
528 break;
529
530 case ICS_TYPE_V6:
531 ret = pata_icside_register_v6(&info);
532 break;
533
534 default:
535 dev_warn(&ec->dev, "unknown interface type\n");
536 ret = -ENODEV;
537 break;
538 }
539
540 if (ret == 0)
541 ret = pata_icside_add_ports(&info);
542
543 if (ret == 0)
544 goto out;
545
546 release:
547 ecard_release_resources(ec);
548 out:
549 return ret;
550 }
551
552 static void pata_icside_shutdown(struct expansion_card *ec)
553 {
554 struct ata_host *host = ecard_get_drvdata(ec);
555 unsigned long flags;
556
557 /*
558 * Disable interrupts from this card. We need to do
559 * this before disabling EASI since we may be accessing
560 * this register via that region.
561 */
562 local_irq_save(flags);
563 ec->ops->irqdisable(ec, ec->irq);
564 local_irq_restore(flags);
565
566 /*
567 * Reset the ROM pointer so that we can read the ROM
568 * after a soft reboot. This also disables access to
569 * the IDE taskfile via the EASI region.
570 */
571 if (host) {
572 struct pata_icside_state *state = host->private_data;
573 if (state->ioc_base)
574 writeb(0, state->ioc_base);
575 }
576 }
577
578 static void pata_icside_remove(struct expansion_card *ec)
579 {
580 struct ata_host *host = ecard_get_drvdata(ec);
581 struct pata_icside_state *state = host->private_data;
582
583 ata_host_detach(host);
584
585 pata_icside_shutdown(ec);
586
587 /*
588 * don't NULL out the drvdata - devres/libata wants it
589 * to free the ata_host structure.
590 */
591 if (state->dma != NO_DMA)
592 free_dma(state->dma);
593
594 ecard_release_resources(ec);
595 }
596
597 static const struct ecard_id pata_icside_ids[] = {
598 { MANU_ICS, PROD_ICS_IDE },
599 { MANU_ICS2, PROD_ICS2_IDE },
600 { 0xffff, 0xffff }
601 };
602
603 static struct ecard_driver pata_icside_driver = {
604 .probe = pata_icside_probe,
605 .remove = pata_icside_remove,
606 .shutdown = pata_icside_shutdown,
607 .id_table = pata_icside_ids,
608 .drv = {
609 .name = DRV_NAME,
610 },
611 };
612
613 static int __init pata_icside_init(void)
614 {
615 return ecard_register_driver(&pata_icside_driver);
616 }
617
618 static void __exit pata_icside_exit(void)
619 {
620 ecard_remove_driver(&pata_icside_driver);
621 }
622
623 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
624 MODULE_LICENSE("GPL");
625 MODULE_DESCRIPTION("ICS PATA driver");
626
627 module_init(pata_icside_init);
628 module_exit(pata_icside_exit);
Linux with added FPC-III support