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