summaryrefslogtreecommitdiffstats
path: root/drivers/ata/libahci_platform.c
blob: c7f787e9939b15bbb4fe6168068be3abbff3f0ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
/*
 * AHCI SATA platform library
 *
 * Copyright 2004-2005  Red Hat, Inc.
 *   Jeff Garzik <jgarzik@pobox.com>
 * Copyright 2010  MontaVista Software, LLC.
 *   Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 */

#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <linux/ahci_platform.h>
#include <linux/phy/phy.h>
#include <linux/pm_runtime.h>
#include "ahci.h"

static void ahci_host_stop(struct ata_host *host);

struct ata_port_operations ahci_platform_ops = {
	.inherits	= &ahci_ops,
	.host_stop	= ahci_host_stop,
};
EXPORT_SYMBOL_GPL(ahci_platform_ops);

static struct scsi_host_template ahci_platform_sht = {
	AHCI_SHT("ahci_platform"),
};

/**
 * ahci_platform_enable_phys - Enable PHYs
 * @hpriv: host private area to store config values
 *
 * This function enables all the PHYs found in hpriv->phys, if any.
 * If a PHY fails to be enabled, it disables all the PHYs already
 * enabled in reverse order and returns an error.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
static int ahci_platform_enable_phys(struct ahci_host_priv *hpriv)
{
	int rc, i;

	for (i = 0; i < hpriv->nports; i++) {
		if (!hpriv->phys[i])
			continue;

		rc = phy_init(hpriv->phys[i]);
		if (rc)
			goto disable_phys;

		rc = phy_power_on(hpriv->phys[i]);
		if (rc) {
			phy_exit(hpriv->phys[i]);
			goto disable_phys;
		}
	}

	return 0;

disable_phys:
	while (--i >= 0) {
		phy_power_off(hpriv->phys[i]);
		phy_exit(hpriv->phys[i]);
	}
	return rc;
}

/**
 * ahci_platform_disable_phys - Disable PHYs
 * @hpriv: host private area to store config values
 *
 * This function disables all PHYs found in hpriv->phys.
 */
static void ahci_platform_disable_phys(struct ahci_host_priv *hpriv)
{
	int i;

	for (i = 0; i < hpriv->nports; i++) {
		if (!hpriv->phys[i])
			continue;

		phy_power_off(hpriv->phys[i]);
		phy_exit(hpriv->phys[i]);
	}
}

/**
 * ahci_platform_enable_clks - Enable platform clocks
 * @hpriv: host private area to store config values
 *
 * This function enables all the clks found in hpriv->clks, starting at
 * index 0. If any clk fails to enable it disables all the clks already
 * enabled in reverse order, and then returns an error.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_enable_clks(struct ahci_host_priv *hpriv)
{
	int c, rc;

	for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) {
		rc = clk_prepare_enable(hpriv->clks[c]);
		if (rc)
			goto disable_unprepare_clk;
	}
	return 0;

disable_unprepare_clk:
	while (--c >= 0)
		clk_disable_unprepare(hpriv->clks[c]);
	return rc;
}
EXPORT_SYMBOL_GPL(ahci_platform_enable_clks);

/**
 * ahci_platform_disable_clks - Disable platform clocks
 * @hpriv: host private area to store config values
 *
 * This function disables all the clks found in hpriv->clks, in reverse
 * order of ahci_platform_enable_clks (starting at the end of the array).
 */
void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
{
	int c;

	for (c = AHCI_MAX_CLKS - 1; c >= 0; c--)
		if (hpriv->clks[c])
			clk_disable_unprepare(hpriv->clks[c]);
}
EXPORT_SYMBOL_GPL(ahci_platform_disable_clks);

/**
 * ahci_platform_enable_resources - Enable platform resources
 * @hpriv: host private area to store config values
 *
 * This function enables all ahci_platform managed resources in the
 * following order:
 * 1) Regulator
 * 2) Clocks (through ahci_platform_enable_clks)
 * 3) Phys
 *
 * If resource enabling fails at any point the previous enabled resources
 * are disabled in reverse order.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
{
	int rc;

	if (hpriv->target_pwr) {
		rc = regulator_enable(hpriv->target_pwr);
		if (rc)
			return rc;
	}

	rc = ahci_platform_enable_clks(hpriv);
	if (rc)
		goto disable_regulator;

	rc = ahci_platform_enable_phys(hpriv);
	if (rc)
		goto disable_clks;

	return 0;

disable_clks:
	ahci_platform_disable_clks(hpriv);

disable_regulator:
	if (hpriv->target_pwr)
		regulator_disable(hpriv->target_pwr);
	return rc;
}
EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);

/**
 * ahci_platform_disable_resources - Disable platform resources
 * @hpriv: host private area to store config values
 *
 * This function disables all ahci_platform managed resources in the
 * following order:
 * 1) Phys
 * 2) Clocks (through ahci_platform_disable_clks)
 * 3) Regulator
 */
void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
{
	ahci_platform_disable_phys(hpriv);

	ahci_platform_disable_clks(hpriv);

	if (hpriv->target_pwr)
		regulator_disable(hpriv->target_pwr);
}
EXPORT_SYMBOL_GPL(ahci_platform_disable_resources);

static void ahci_platform_put_resources(struct device *dev, void *res)
{
	struct ahci_host_priv *hpriv = res;
	int c;

	if (hpriv->got_runtime_pm) {
		pm_runtime_put_sync(dev);
		pm_runtime_disable(dev);
	}

	for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
		clk_put(hpriv->clks[c]);
}

/**
 * ahci_platform_get_resources - Get platform resources
 * @pdev: platform device to get resources for
 *
 * This function allocates an ahci_host_priv struct, and gets the following
 * resources, storing a reference to them inside the returned struct:
 *
 * 1) mmio registers (IORESOURCE_MEM 0, mandatory)
 * 2) regulator for controlling the targets power (optional)
 * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
 *    or for non devicetree enabled platforms a single clock
 *	4) phys (optional)
 *
 * RETURNS:
 * The allocated ahci_host_priv on success, otherwise an ERR_PTR value
 */
struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ahci_host_priv *hpriv;
	struct clk *clk;
	struct device_node *child;
	int i, enabled_ports = 0, rc = -ENOMEM;
	u32 mask_port_map = 0;

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return ERR_PTR(-ENOMEM);

	hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),
			     GFP_KERNEL);
	if (!hpriv)
		goto err_out;

	devres_add(dev, hpriv);

	hpriv->mmio = devm_ioremap_resource(dev,
			      platform_get_resource(pdev, IORESOURCE_MEM, 0));
	if (IS_ERR(hpriv->mmio)) {
		dev_err(dev, "no mmio space\n");
		rc = PTR_ERR(hpriv->mmio);
		goto err_out;
	}

	hpriv->target_pwr = devm_regulator_get_optional(dev, "target");
	if (IS_ERR(hpriv->target_pwr)) {
		rc = PTR_ERR(hpriv->target_pwr);
		if (rc == -EPROBE_DEFER)
			goto err_out;
		hpriv->target_pwr = NULL;
	}

	for (i = 0; i < AHCI_MAX_CLKS; i++) {
		/*
		 * For now we must use clk_get(dev, NULL) for the first clock,
		 * because some platforms (da850, spear13xx) are not yet
		 * converted to use devicetree for clocks.  For new platforms
		 * this is equivalent to of_clk_get(dev->of_node, 0).
		 */
		if (i == 0)
			clk = clk_get(dev, NULL);
		else
			clk = of_clk_get(dev->of_node, i);

		if (IS_ERR(clk)) {
			rc = PTR_ERR(clk);
			if (rc == -EPROBE_DEFER)
				goto err_out;
			break;
		}
		hpriv->clks[i] = clk;
	}

	hpriv->nports = of_get_child_count(dev->of_node);

	if (hpriv->nports) {
		hpriv->phys = devm_kzalloc(dev,
					   hpriv->nports * sizeof(*hpriv->phys),
					   GFP_KERNEL);
		if (!hpriv->phys) {
			rc = -ENOMEM;
			goto err_out;
		}

		for_each_child_of_node(dev->of_node, child) {
			u32 port;

			if (!of_device_is_available(child))
				continue;

			if (of_property_read_u32(child, "reg", &port)) {
				rc = -EINVAL;
				goto err_out;
			}

			if (port >= hpriv->nports) {
				dev_warn(dev, "invalid port number %d\n", port);
				continue;
			}

			mask_port_map |= BIT(port);

			hpriv->phys[port] = devm_of_phy_get(dev, child, NULL);
			if (IS_ERR(hpriv->phys[port])) {
				rc = PTR_ERR(hpriv->phys[port]);
				dev_err(dev,
					"couldn't get PHY in node %s: %d\n",
					child->name, rc);
				goto err_out;
			}

			enabled_ports++;
		}
		if (!enabled_ports) {
			dev_warn(dev, "No port enabled\n");
			rc = -ENODEV;
			goto err_out;
		}

		if (!hpriv->mask_port_map)
			hpriv->mask_port_map = mask_port_map;
	} else {
		/*
		 * If no sub-node was found, keep this for device tree
		 * compatibility
		 */
		struct phy *phy = devm_phy_get(dev, "sata-phy");
		if (!IS_ERR(phy)) {
			hpriv->phys = devm_kzalloc(dev, sizeof(*hpriv->phys),
						   GFP_KERNEL);
			if (!hpriv->phys) {
				rc = -ENOMEM;
				goto err_out;
			}

			hpriv->phys[0] = phy;
			hpriv->nports = 1;
		} else {
			rc = PTR_ERR(phy);
			switch (rc) {
				case -ENOSYS:
					/* No PHY support. Check if PHY is required. */
					if (of_find_property(dev->of_node, "phys", NULL)) {
						dev_err(dev, "couldn't get sata-phy: ENOSYS\n");
						goto err_out;
					}
				case -ENODEV:
					/* continue normally */
					hpriv->phys = NULL;
					break;

				default:
					goto err_out;

			}
		}
	}

	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);
	hpriv->got_runtime_pm = true;

	devres_remove_group(dev, NULL);
	return hpriv;

err_out:
	devres_release_group(dev, NULL);
	return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(ahci_platform_get_resources);

/**
 * ahci_platform_init_host - Bring up an ahci-platform host
 * @pdev: platform device pointer for the host
 * @hpriv: ahci-host private data for the host
 * @pi_template: template for the ata_port_info to use
 *
 * This function does all the usual steps needed to bring up an
 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
 * must be initialized / enabled before calling this.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_init_host(struct platform_device *pdev,
			    struct ahci_host_priv *hpriv,
			    const struct ata_port_info *pi_template)
{
	struct device *dev = &pdev->dev;
	struct ata_port_info pi = *pi_template;
	const struct ata_port_info *ppi[] = { &pi, NULL };
	struct ata_host *host;
	int i, irq, n_ports, rc;

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_err(dev, "no irq\n");
		return -EINVAL;
	}

	/* prepare host */
	pi.private_data = (void *)(unsigned long)hpriv->flags;

	ahci_save_initial_config(dev, hpriv);

	if (hpriv->cap & HOST_CAP_NCQ)
		pi.flags |= ATA_FLAG_NCQ;

	if (hpriv->cap & HOST_CAP_PMP)
		pi.flags |= ATA_FLAG_PMP;

	ahci_set_em_messages(hpriv, &pi);

	/* CAP.NP sometimes indicate the index of the last enabled
	 * port, at other times, that of the last possible port, so
	 * determining the maximum port number requires looking at
	 * both CAP.NP and port_map.
	 */
	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));

	host = ata_host_alloc_pinfo(dev, ppi, n_ports);
	if (!host)
		return -ENOMEM;

	host->private_data = hpriv;

	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
		host->flags |= ATA_HOST_PARALLEL_SCAN;
	else
		dev_info(dev, "SSS flag set, parallel bus scan disabled\n");

	if (pi.flags & ATA_FLAG_EM)
		ahci_reset_em(host);

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		ata_port_desc(ap, "mmio %pR",
			      platform_get_resource(pdev, IORESOURCE_MEM, 0));
		ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);

		/* set enclosure management message type */
		if (ap->flags & ATA_FLAG_EM)
			ap->em_message_type = hpriv->em_msg_type;

		/* disabled/not-implemented port */
		if (!(hpriv->port_map & (1 << i)))
			ap->ops = &ata_dummy_port_ops;
	}

	if (hpriv->cap & HOST_CAP_64) {
		rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
		if (rc) {
			rc = dma_coerce_mask_and_coherent(dev,
							  DMA_BIT_MASK(32));
			if (rc) {
				dev_err(dev, "Failed to enable 64-bit DMA.\n");
				return rc;
			}
			dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
		}
	}

	rc = ahci_reset_controller(host);
	if (rc)
		return rc;

	ahci_init_controller(host);
	ahci_print_info(host, "platform");

	return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
				 &ahci_platform_sht);
}
EXPORT_SYMBOL_GPL(ahci_platform_init_host);

static void ahci_host_stop(struct ata_host *host)
{
	struct ahci_host_priv *hpriv = host->private_data;

	ahci_platform_disable_resources(hpriv);
}

#ifdef CONFIG_PM_SLEEP
/**
 * ahci_platform_suspend_host - Suspend an ahci-platform host
 * @dev: device pointer for the host
 *
 * This function does all the usual steps needed to suspend an
 * ahci-platform host, note any necessary resources (ie clks, phys, etc.)
 * must be disabled after calling this.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_suspend_host(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;
	void __iomem *mmio = hpriv->mmio;
	u32 ctl;

	if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
		dev_err(dev, "firmware update required for suspend/resume\n");
		return -EIO;
	}

	/*
	 * AHCI spec rev1.1 section 8.3.3:
	 * Software must disable interrupts prior to requesting a
	 * transition of the HBA to D3 state.
	 */
	ctl = readl(mmio + HOST_CTL);
	ctl &= ~HOST_IRQ_EN;
	writel(ctl, mmio + HOST_CTL);
	readl(mmio + HOST_CTL); /* flush */

	return ata_host_suspend(host, PMSG_SUSPEND);
}
EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);

/**
 * ahci_platform_resume_host - Resume an ahci-platform host
 * @dev: device pointer for the host
 *
 * This function does all the usual steps needed to resume an ahci-platform
 * host, note any necessary resources (ie clks, phys, etc.)  must be
 * initialized / enabled before calling this.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_resume_host(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	int rc;

	if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
		rc = ahci_reset_controller(host);
		if (rc)
			return rc;

		ahci_init_controller(host);
	}

	ata_host_resume(host);

	return 0;
}
EXPORT_SYMBOL_GPL(ahci_platform_resume_host);

/**
 * ahci_platform_suspend - Suspend an ahci-platform device
 * @dev: the platform device to suspend
 *
 * This function suspends the host associated with the device, followed by
 * disabling all the resources of the device.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_suspend(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;
	int rc;

	rc = ahci_platform_suspend_host(dev);
	if (rc)
		return rc;

	ahci_platform_disable_resources(hpriv);

	return 0;
}
EXPORT_SYMBOL_GPL(ahci_platform_suspend);

/**
 * ahci_platform_resume - Resume an ahci-platform device
 * @dev: the platform device to resume
 *
 * This function enables all the resources of the device followed by
 * resuming the host associated with the device.
 *
 * RETURNS:
 * 0 on success otherwise a negative error code
 */
int ahci_platform_resume(struct device *dev)
{
	struct ata_host *host = dev_get_drvdata(dev);
	struct ahci_host_priv *hpriv = host->private_data;
	int rc;

	rc = ahci_platform_enable_resources(hpriv);
	if (rc)
		return rc;

	rc = ahci_platform_resume_host(dev);
	if (rc)
		goto disable_resources;

	/* We resumed so update PM runtime state */
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	return 0;

disable_resources:
	ahci_platform_disable_resources(hpriv);

	return rc;
}
EXPORT_SYMBOL_GPL(ahci_platform_resume);
#endif

MODULE_DESCRIPTION("AHCI SATA platform library");
MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
MODULE_LICENSE("GPL");