summaryrefslogtreecommitdiff
path: root/drivers/mmc/core/bus.c
blob: a4b49e25fe963b135d71c0532ce0bf5c8951a3cd (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
/*
 *  linux/drivers/mmc/core/bus.c
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *  Copyright (C) 2007 Pierre Ossman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  MMC card bus driver model
 */

#include <linux/export.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>

#include "core.h"
#include "card.h"
#include "host.h"
#include "sdio_cis.h"
#include "bus.h"

#define to_mmc_driver(d)	container_of(d, struct mmc_driver, drv)

static ssize_t type_show(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct mmc_card *card = mmc_dev_to_card(dev);

	switch (card->type) {
	case MMC_TYPE_MMC:
		return sprintf(buf, "MMC\n");
	case MMC_TYPE_SD:
		return sprintf(buf, "SD\n");
	case MMC_TYPE_SDIO:
		return sprintf(buf, "SDIO\n");
	case MMC_TYPE_SD_COMBO:
		return sprintf(buf, "SDcombo\n");
	default:
		return -EFAULT;
	}
}
static DEVICE_ATTR_RO(type);

static struct attribute *mmc_dev_attrs[] = {
	&dev_attr_type.attr,
	NULL,
};
ATTRIBUTE_GROUPS(mmc_dev);

/*
 * This currently matches any MMC driver to any MMC card - drivers
 * themselves make the decision whether to drive this card in their
 * probe method.
 */
static int mmc_bus_match(struct device *dev, struct device_driver *drv)
{
	return 1;
}

static int
mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct mmc_card *card = mmc_dev_to_card(dev);
	const char *type;
	int retval = 0;

	switch (card->type) {
	case MMC_TYPE_MMC:
		type = "MMC";
		break;
	case MMC_TYPE_SD:
		type = "SD";
		break;
	case MMC_TYPE_SDIO:
		type = "SDIO";
		break;
	case MMC_TYPE_SD_COMBO:
		type = "SDcombo";
		break;
	default:
		type = NULL;
	}

	if (type) {
		retval = add_uevent_var(env, "MMC_TYPE=%s", type);
		if (retval)
			return retval;
	}

	retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
	if (retval)
		return retval;

	/*
	 * Request the mmc_block device.  Note: that this is a direct request
	 * for the module it carries no information as to what is inserted.
	 */
	retval = add_uevent_var(env, "MODALIAS=mmc:block");

	return retval;
}

static int mmc_bus_probe(struct device *dev)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = mmc_dev_to_card(dev);

	return drv->probe(card);
}

static int mmc_bus_remove(struct device *dev)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = mmc_dev_to_card(dev);

	drv->remove(card);

	return 0;
}

static void mmc_bus_shutdown(struct device *dev)
{
	struct mmc_driver *drv = to_mmc_driver(dev->driver);
	struct mmc_card *card = mmc_dev_to_card(dev);
	struct mmc_host *host = card->host;
	int ret;

	if (dev->driver && drv->shutdown)
		drv->shutdown(card);

	if (host->bus_ops->shutdown) {
		ret = host->bus_ops->shutdown(host);
		if (ret)
			pr_warn("%s: error %d during shutdown\n",
				mmc_hostname(host), ret);
	}
}

#ifdef CONFIG_PM_SLEEP
static int mmc_bus_suspend(struct device *dev)
{
	struct mmc_card *card = mmc_dev_to_card(dev);
	struct mmc_host *host = card->host;
	int ret;

	ret = pm_generic_suspend(dev);
	if (ret)
		return ret;

	ret = host->bus_ops->suspend(host);
	return ret;
}

static int mmc_bus_resume(struct device *dev)
{
	struct mmc_card *card = mmc_dev_to_card(dev);
	struct mmc_host *host = card->host;
	int ret;

	ret = host->bus_ops->resume(host);
	if (ret)
		pr_warn("%s: error %d during resume (card was removed?)\n",
			mmc_hostname(host), ret);

	ret = pm_generic_resume(dev);
	return ret;
}
#endif

#ifdef CONFIG_PM
static int mmc_runtime_suspend(struct device *dev)
{
	struct mmc_card *card = mmc_dev_to_card(dev);
	struct mmc_host *host = card->host;

	return host->bus_ops->runtime_suspend(host);
}

static int mmc_runtime_resume(struct device *dev)
{
	struct mmc_card *card = mmc_dev_to_card(dev);
	struct mmc_host *host = card->host;

	return host->bus_ops->runtime_resume(host);
}
#endif /* !CONFIG_PM */

static const struct dev_pm_ops mmc_bus_pm_ops = {
	SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
	SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
};

static struct bus_type mmc_bus_type = {
	.name		= "mmc",
	.dev_groups	= mmc_dev_groups,
	.match		= mmc_bus_match,
	.uevent		= mmc_bus_uevent,
	.probe		= mmc_bus_probe,
	.remove		= mmc_bus_remove,
	.shutdown	= mmc_bus_shutdown,
	.pm		= &mmc_bus_pm_ops,
};

int mmc_register_bus(void)
{
	return bus_register(&mmc_bus_type);
}

void mmc_unregister_bus(void)
{
	bus_unregister(&mmc_bus_type);
}

/**
 *	mmc_register_driver - register a media driver
 *	@drv: MMC media driver
 */
int mmc_register_driver(struct mmc_driver *drv)
{
	drv->drv.bus = &mmc_bus_type;
	return driver_register(&drv->drv);
}

EXPORT_SYMBOL(mmc_register_driver);

/**
 *	mmc_unregister_driver - unregister a media driver
 *	@drv: MMC media driver
 */
void mmc_unregister_driver(struct mmc_driver *drv)
{
	drv->drv.bus = &mmc_bus_type;
	driver_unregister(&drv->drv);
}

EXPORT_SYMBOL(mmc_unregister_driver);

static void mmc_release_card(struct device *dev)
{
	struct mmc_card *card = mmc_dev_to_card(dev);

	sdio_free_common_cis(card);

	kfree(card->info);

	kfree(card);
}

/*
 * Allocate and initialise a new MMC card structure.
 */
struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
{
	struct mmc_card *card;

	card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
	if (!card)
		return ERR_PTR(-ENOMEM);

	card->host = host;

	device_initialize(&card->dev);

	card->dev.parent = mmc_classdev(host);
	card->dev.bus = &mmc_bus_type;
	card->dev.release = mmc_release_card;
	card->dev.type = type;

	return card;
}

/*
 * Register a new MMC card with the driver model.
 */
int mmc_add_card(struct mmc_card *card)
{
	int ret;
	const char *type;
	const char *uhs_bus_speed_mode = "";
	static const char *const uhs_speeds[] = {
		[UHS_SDR12_BUS_SPEED] = "SDR12 ",
		[UHS_SDR25_BUS_SPEED] = "SDR25 ",
		[UHS_SDR50_BUS_SPEED] = "SDR50 ",
		[UHS_SDR104_BUS_SPEED] = "SDR104 ",
		[UHS_DDR50_BUS_SPEED] = "DDR50 ",
	};


	dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);

	switch (card->type) {
	case MMC_TYPE_MMC:
		type = "MMC";
		break;
	case MMC_TYPE_SD:
		type = "SD";
		if (mmc_card_blockaddr(card)) {
			if (mmc_card_ext_capacity(card))
				type = "SDXC";
			else
				type = "SDHC";
		}
		break;
	case MMC_TYPE_SDIO:
		type = "SDIO";
		break;
	case MMC_TYPE_SD_COMBO:
		type = "SD-combo";
		if (mmc_card_blockaddr(card))
			type = "SDHC-combo";
		break;
	default:
		type = "?";
		break;
	}

	if (mmc_card_uhs(card) &&
		(card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
		uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];

	if (mmc_host_is_spi(card->host)) {
		pr_info("%s: new %s%s%s card on SPI\n",
			mmc_hostname(card->host),
			mmc_card_hs(card) ? "high speed " : "",
			mmc_card_ddr52(card) ? "DDR " : "",
			type);
	} else {
		pr_info("%s: new %s%s%s%s%s%s card at address %04x\n",
			mmc_hostname(card->host),
			mmc_card_uhs(card) ? "ultra high speed " :
			(mmc_card_hs(card) ? "high speed " : ""),
			mmc_card_hs400(card) ? "HS400 " :
			(mmc_card_hs200(card) ? "HS200 " : ""),
			mmc_card_hs400es(card) ? "Enhanced strobe " : "",
			mmc_card_ddr52(card) ? "DDR " : "",
			uhs_bus_speed_mode, type, card->rca);
	}

#ifdef CONFIG_DEBUG_FS
	mmc_add_card_debugfs(card);
#endif
	mmc_init_context_info(card->host);

	card->dev.of_node = mmc_of_find_child_device(card->host, 0);

	device_enable_async_suspend(&card->dev);

	ret = device_add(&card->dev);
	if (ret)
		return ret;

	mmc_card_set_present(card);

	return 0;
}

/*
 * Unregister a new MMC card with the driver model, and
 * (eventually) free it.
 */
void mmc_remove_card(struct mmc_card *card)
{
	struct mmc_host *host = card->host;

#ifdef CONFIG_DEBUG_FS
	mmc_remove_card_debugfs(card);
#endif

	if (host->cqe_enabled) {
		host->cqe_ops->cqe_disable(host);
		host->cqe_enabled = false;
	}

	if (mmc_card_present(card)) {
		if (mmc_host_is_spi(card->host)) {
			pr_info("%s: SPI card removed\n",
				mmc_hostname(card->host));
		} else {
			pr_info("%s: card %04x removed\n",
				mmc_hostname(card->host), card->rca);
		}
		device_del(&card->dev);
		of_node_put(card->dev.of_node);
	}

	put_device(&card->dev);
}