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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/mmc/core/bus.c
4 *
5 * Copyright (C) 2003 Russell King, All Rights Reserved.
6 * Copyright (C) 2007 Pierre Ossman
7 *
8 * MMC card bus driver model
9 */
10
11#include <linux/export.h>
12#include <linux/device.h>
13#include <linux/err.h>
14#include <linux/slab.h>
15#include <linux/stat.h>
16#include <linux/of.h>
17#include <linux/pm_runtime.h>
18#include <linux/sysfs.h>
19
20#include <linux/mmc/card.h>
21#include <linux/mmc/host.h>
22#include <linux/mmc/mmc.h>
23
24#include "core.h"
25#include "card.h"
26#include "host.h"
27#include "sdio_cis.h"
28#include "bus.h"
29
30#define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
31
32static ssize_t type_show(struct device *dev,
33 struct device_attribute *attr, char *buf)
34{
35 struct mmc_card *card = mmc_dev_to_card(dev);
36
37 switch (card->type) {
38 case MMC_TYPE_MMC:
39 return sysfs_emit(buf, "MMC\n");
40 case MMC_TYPE_SD:
41 return sysfs_emit(buf, "SD\n");
42 case MMC_TYPE_SDIO:
43 return sysfs_emit(buf, "SDIO\n");
44 case MMC_TYPE_SD_COMBO:
45 return sysfs_emit(buf, "SDcombo\n");
46 default:
47 return -EFAULT;
48 }
49}
50static DEVICE_ATTR_RO(type);
51
52static struct attribute *mmc_dev_attrs[] = {
53 &dev_attr_type.attr,
54 NULL,
55};
56ATTRIBUTE_GROUPS(mmc_dev);
57
58static int
59mmc_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
60{
61 const struct mmc_card *card = mmc_dev_to_card(dev);
62 const char *type;
63 unsigned int i;
64 int retval = 0;
65
66 switch (card->type) {
67 case MMC_TYPE_MMC:
68 type = "MMC";
69 break;
70 case MMC_TYPE_SD:
71 type = "SD";
72 break;
73 case MMC_TYPE_SDIO:
74 type = "SDIO";
75 break;
76 case MMC_TYPE_SD_COMBO:
77 type = "SDcombo";
78 break;
79 default:
80 type = NULL;
81 }
82
83 if (type) {
84 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
85 if (retval)
86 return retval;
87 }
88
89 if (mmc_card_sdio(card) || mmc_card_sd_combo(card)) {
90 retval = add_uevent_var(env, "SDIO_ID=%04X:%04X",
91 card->cis.vendor, card->cis.device);
92 if (retval)
93 return retval;
94
95 retval = add_uevent_var(env, "SDIO_REVISION=%u.%u",
96 card->major_rev, card->minor_rev);
97 if (retval)
98 return retval;
99
100 for (i = 0; i < card->num_info; i++) {
101 retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]);
102 if (retval)
103 return retval;
104 }
105 }
106
107 /*
108 * SDIO (non-combo) cards are not handled by mmc_block driver and do not
109 * have accessible CID register which used by mmc_card_name() function.
110 */
111 if (mmc_card_sdio(card))
112 return 0;
113
114 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
115 if (retval)
116 return retval;
117
118 /*
119 * Request the mmc_block device. Note: that this is a direct request
120 * for the module it carries no information as to what is inserted.
121 */
122 retval = add_uevent_var(env, "MODALIAS=mmc:block");
123
124 return retval;
125}
126
127static int mmc_bus_probe(struct device *dev)
128{
129 struct mmc_driver *drv = to_mmc_driver(dev->driver);
130 struct mmc_card *card = mmc_dev_to_card(dev);
131
132 return drv->probe(card);
133}
134
135static void mmc_bus_remove(struct device *dev)
136{
137 struct mmc_driver *drv = to_mmc_driver(dev->driver);
138 struct mmc_card *card = mmc_dev_to_card(dev);
139
140 drv->remove(card);
141}
142
143static void mmc_bus_shutdown(struct device *dev)
144{
145 struct mmc_driver *drv = to_mmc_driver(dev->driver);
146 struct mmc_card *card = mmc_dev_to_card(dev);
147 struct mmc_host *host = card->host;
148 int ret;
149
150 if (dev->driver && drv->shutdown)
151 drv->shutdown(card);
152
153 __mmc_stop_host(host);
154
155 if (host->bus_ops->shutdown) {
156 ret = host->bus_ops->shutdown(host);
157 if (ret)
158 pr_warn("%s: error %d during shutdown\n",
159 mmc_hostname(host), ret);
160 }
161}
162
163#ifdef CONFIG_PM_SLEEP
164static int mmc_bus_suspend(struct device *dev)
165{
166 struct mmc_card *card = mmc_dev_to_card(dev);
167 struct mmc_host *host = card->host;
168 int ret;
169
170 ret = pm_generic_suspend(dev);
171 if (ret)
172 return ret;
173
174 ret = host->bus_ops->suspend(host);
175 if (ret)
176 pm_generic_resume(dev);
177
178 return ret;
179}
180
181static int mmc_bus_resume(struct device *dev)
182{
183 struct mmc_card *card = mmc_dev_to_card(dev);
184 struct mmc_host *host = card->host;
185 int ret;
186
187 ret = host->bus_ops->resume(host);
188 if (ret)
189 pr_warn("%s: error %d during resume (card was removed?)\n",
190 mmc_hostname(host), ret);
191
192 ret = pm_generic_resume(dev);
193 return ret;
194}
195#endif
196
197#ifdef CONFIG_PM
198static int mmc_runtime_suspend(struct device *dev)
199{
200 struct mmc_card *card = mmc_dev_to_card(dev);
201 struct mmc_host *host = card->host;
202
203 return host->bus_ops->runtime_suspend(host);
204}
205
206static int mmc_runtime_resume(struct device *dev)
207{
208 struct mmc_card *card = mmc_dev_to_card(dev);
209 struct mmc_host *host = card->host;
210
211 return host->bus_ops->runtime_resume(host);
212}
213#endif /* !CONFIG_PM */
214
215static const struct dev_pm_ops mmc_bus_pm_ops = {
216 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
217 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
218};
219
220static const struct bus_type mmc_bus_type = {
221 .name = "mmc",
222 .dev_groups = mmc_dev_groups,
223 .uevent = mmc_bus_uevent,
224 .probe = mmc_bus_probe,
225 .remove = mmc_bus_remove,
226 .shutdown = mmc_bus_shutdown,
227 .pm = &mmc_bus_pm_ops,
228};
229
230int mmc_register_bus(void)
231{
232 return bus_register(&mmc_bus_type);
233}
234
235void mmc_unregister_bus(void)
236{
237 bus_unregister(&mmc_bus_type);
238}
239
240/**
241 * mmc_register_driver - register a media driver
242 * @drv: MMC media driver
243 */
244int mmc_register_driver(struct mmc_driver *drv)
245{
246 drv->drv.bus = &mmc_bus_type;
247 return driver_register(&drv->drv);
248}
249
250EXPORT_SYMBOL(mmc_register_driver);
251
252/**
253 * mmc_unregister_driver - unregister a media driver
254 * @drv: MMC media driver
255 */
256void mmc_unregister_driver(struct mmc_driver *drv)
257{
258 drv->drv.bus = &mmc_bus_type;
259 driver_unregister(&drv->drv);
260}
261
262EXPORT_SYMBOL(mmc_unregister_driver);
263
264static void mmc_release_card(struct device *dev)
265{
266 struct mmc_card *card = mmc_dev_to_card(dev);
267
268 sdio_free_common_cis(card);
269
270 kfree(card->info);
271
272 kfree(card);
273}
274
275/*
276 * Allocate and initialise a new MMC card structure.
277 */
278struct mmc_card *mmc_alloc_card(struct mmc_host *host, const struct device_type *type)
279{
280 struct mmc_card *card;
281
282 card = kzalloc_obj(struct mmc_card);
283 if (!card)
284 return ERR_PTR(-ENOMEM);
285
286 card->host = host;
287
288 device_initialize(&card->dev);
289
290 card->dev.parent = mmc_classdev(host);
291 card->dev.bus = &mmc_bus_type;
292 card->dev.release = mmc_release_card;
293 card->dev.type = type;
294
295 return card;
296}
297
298/*
299 * Register a new MMC card with the driver model.
300 */
301int mmc_add_card(struct mmc_card *card)
302{
303 int ret;
304 const char *type;
305 const char *speed_mode = "";
306 const char *uhs_bus_speed_mode = "";
307 static const char *const uhs_speeds[] = {
308 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
309 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
310 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
311 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
312 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
313 };
314
315
316 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
317 dev_set_removable(&card->dev,
318 mmc_card_is_removable(card->host) ?
319 DEVICE_REMOVABLE : DEVICE_FIXED);
320
321 switch (card->type) {
322 case MMC_TYPE_MMC:
323 type = "MMC";
324 break;
325 case MMC_TYPE_SD:
326 type = "SD";
327 if (mmc_card_blockaddr(card)) {
328 if (mmc_card_ult_capacity(card))
329 type = "SDUC";
330 else if (mmc_card_ext_capacity(card))
331 type = "SDXC";
332 else
333 type = "SDHC";
334 }
335 break;
336 case MMC_TYPE_SDIO:
337 type = "SDIO";
338 break;
339 case MMC_TYPE_SD_COMBO:
340 type = "SD-combo";
341 if (mmc_card_blockaddr(card))
342 type = "SDHC-combo";
343 break;
344 default:
345 type = "?";
346 break;
347 }
348
349 if (mmc_card_hs(card))
350 speed_mode = "high speed ";
351 else if (mmc_card_uhs(card))
352 speed_mode = "UHS-I speed ";
353 else if (mmc_card_uhs2(card->host))
354 speed_mode = "UHS-II speed ";
355 else if (mmc_card_ddr52(card))
356 speed_mode = "high speed DDR ";
357 else if (mmc_card_hs200(card))
358 speed_mode = "HS200 ";
359 else if (mmc_card_hs400es(card))
360 speed_mode = "HS400 Enhanced strobe ";
361 else if (mmc_card_hs400(card))
362 speed_mode = "HS400 ";
363
364 if (mmc_card_uhs(card) &&
365 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
366 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
367
368 if (mmc_host_is_spi(card->host))
369 pr_info("%s: new %s%s card on SPI\n",
370 mmc_hostname(card->host), speed_mode, type);
371 else
372 pr_info("%s: new %s%s%s card at address %04x\n",
373 mmc_hostname(card->host), speed_mode,
374 uhs_bus_speed_mode, type, card->rca);
375
376 mmc_add_card_debugfs(card);
377 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
378
379 device_enable_async_suspend(&card->dev);
380
381 ret = device_add(&card->dev);
382 if (ret)
383 return ret;
384
385 mmc_card_set_present(card);
386
387 /*
388 * Register for undervoltage notification if the card supports
389 * power-off notification, enabling emergency shutdowns.
390 */
391 if (mmc_card_mmc(card) &&
392 card->ext_csd.power_off_notification == EXT_CSD_POWER_ON)
393 mmc_regulator_register_undervoltage_notifier(card->host);
394
395 return 0;
396}
397
398/*
399 * Unregister a new MMC card with the driver model, and
400 * (eventually) free it.
401 */
402void mmc_remove_card(struct mmc_card *card)
403{
404 struct mmc_host *host = card->host;
405
406 if (mmc_card_present(card))
407 mmc_regulator_unregister_undervoltage_notifier(host);
408
409 mmc_remove_card_debugfs(card);
410
411 if (mmc_card_present(card)) {
412 if (mmc_host_is_spi(card->host)) {
413 pr_info("%s: SPI card removed\n",
414 mmc_hostname(card->host));
415 } else {
416 pr_info("%s: card %04x removed\n",
417 mmc_hostname(card->host), card->rca);
418 }
419 device_del(&card->dev);
420 }
421 of_node_put(card->dev.of_node);
422
423 if (host->cqe_enabled) {
424 host->cqe_ops->cqe_disable(host);
425 host->cqe_enabled = false;
426 }
427
428 put_device(&card->dev);
429}