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