drivers/mmc/core/bus.c

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