drivers/mmc/host/sdhci-acpi.c

   1 /*
   2  * Secure Digital Host Controller Interface ACPI driver.
   3  *
   4  * Copyright (c) 2012, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/export.h>
  23 #include <linux/module.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/ioport.h>
  27 #include <linux/io.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/compiler.h>
  30 #include <linux/stddef.h>
  31 #include <linux/bitops.h>
  32 #include <linux/types.h>
  33 #include <linux/err.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/acpi.h>
  36 #include <linux/pm.h>
  37 #include <linux/pm_runtime.h>
  38 #include <linux/delay.h>
  39
  40 #include <linux/mmc/host.h>
  41 #include <linux/mmc/pm.h>
  42 #include <linux/mmc/slot-gpio.h>
  43 #include <linux/mmc/sdhci.h>
  44
  45 #include "sdhci.h"
  46
  47 enum {
  48         SDHCI_ACPI_SD_CD                = BIT(0),
  49         SDHCI_ACPI_RUNTIME_PM           = BIT(1),
  50         SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL = BIT(2),
  51 };
  52
  53 struct sdhci_acpi_chip {
  54         const struct    sdhci_ops *ops;
  55         unsigned int    quirks;
  56         unsigned int    quirks2;
  57         unsigned long   caps;
  58         unsigned int    caps2;
  59         mmc_pm_flag_t   pm_caps;
  60 };
  61
  62 struct sdhci_acpi_slot {
  63         const struct    sdhci_acpi_chip *chip;
  64         unsigned int    quirks;
  65         unsigned int    quirks2;
  66         unsigned long   caps;
  67         unsigned int    caps2;
  68         mmc_pm_flag_t   pm_caps;
  69         unsigned int    flags;
  70 };
  71
  72 struct sdhci_acpi_host {
  73         struct sdhci_host               *host;
  74         const struct sdhci_acpi_slot    *slot;
  75         struct platform_device          *pdev;
  76         bool                            use_runtime_pm;
  77 };
  78
  79 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
  80 {
  81         return c->slot && (c->slot->flags & flag);
  82 }
  83
  84 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
  85 {
  86         return 0;
  87 }
  88
  89 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
  90 {
  91         u8 reg;
  92
  93         reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
  94         reg |= 0x10;
  95         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
  96         /* For eMMC, minimum is 1us but give it 9us for good measure */
  97         udelay(9);
  98         reg &= ~0x10;
  99         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 100         /* For eMMC, minimum is 200us but give it 300us for good measure */
 101         usleep_range(300, 1000);
 102 }
 103
 104 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
 105         .set_clock = sdhci_set_clock,
 106         .enable_dma = sdhci_acpi_enable_dma,
 107         .set_bus_width = sdhci_set_bus_width,
 108         .reset = sdhci_reset,
 109         .set_uhs_signaling = sdhci_set_uhs_signaling,
 110 };
 111
 112 static const struct sdhci_ops sdhci_acpi_ops_int = {
 113         .set_clock = sdhci_set_clock,
 114         .enable_dma = sdhci_acpi_enable_dma,
 115         .set_bus_width = sdhci_set_bus_width,
 116         .reset = sdhci_reset,
 117         .set_uhs_signaling = sdhci_set_uhs_signaling,
 118         .hw_reset   = sdhci_acpi_int_hw_reset,
 119 };
 120
 121 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
 122         .ops = &sdhci_acpi_ops_int,
 123 };
 124
 125 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
 126         .chip    = &sdhci_acpi_chip_int,
 127         .caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
 128         .caps2   = MMC_CAP2_HC_ERASE_SZ,
 129         .flags   = SDHCI_ACPI_RUNTIME_PM,
 130 };
 131
 132 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
 133         .quirks  = SDHCI_QUIRK_BROKEN_CARD_DETECTION,
 134         .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
 135         .caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD,
 136         .flags   = SDHCI_ACPI_RUNTIME_PM,
 137         .pm_caps = MMC_PM_KEEP_POWER,
 138 };
 139
 140 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
 141         .flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
 142                    SDHCI_ACPI_RUNTIME_PM,
 143         .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
 144 };
 145
 146 struct sdhci_acpi_uid_slot {
 147         const char *hid;
 148         const char *uid;
 149         const struct sdhci_acpi_slot *slot;
 150 };
 151
 152 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
 153         { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
 154         { "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
 155         { "80860F16" , NULL, &sdhci_acpi_slot_int_sd   },
 156         { "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
 157         { "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
 158         { "INT3436"  , NULL, &sdhci_acpi_slot_int_sdio },
 159         { "PNP0D40"  },
 160         { },
 161 };
 162
 163 static const struct acpi_device_id sdhci_acpi_ids[] = {
 164         { "80860F14" },
 165         { "80860F16" },
 166         { "INT33BB"  },
 167         { "INT33C6"  },
 168         { "INT3436"  },
 169         { "PNP0D40"  },
 170         { },
 171 };
 172 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 173
 174 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot_by_ids(const char *hid,
 175                                                                 const char *uid)
 176 {
 177         const struct sdhci_acpi_uid_slot *u;
 178
 179         for (u = sdhci_acpi_uids; u->hid; u++) {
 180                 if (strcmp(u->hid, hid))
 181                         continue;
 182                 if (!u->uid)
 183                         return u->slot;
 184                 if (uid && !strcmp(u->uid, uid))
 185                         return u->slot;
 186         }
 187         return NULL;
 188 }
 189
 190 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
 191                                                          const char *hid)
 192 {
 193         const struct sdhci_acpi_slot *slot;
 194         struct acpi_device_info *info;
 195         const char *uid = NULL;
 196         acpi_status status;
 197
 198         status = acpi_get_object_info(handle, &info);
 199         if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID))
 200                 uid = info->unique_id.string;
 201
 202         slot = sdhci_acpi_get_slot_by_ids(hid, uid);
 203
 204         kfree(info);
 205         return slot;
 206 }
 207
 208 static int sdhci_acpi_probe(struct platform_device *pdev)
 209 {
 210         struct device *dev = &pdev->dev;
 211         acpi_handle handle = ACPI_HANDLE(dev);
 212         struct acpi_device *device;
 213         struct sdhci_acpi_host *c;
 214         struct sdhci_host *host;
 215         struct resource *iomem;
 216         resource_size_t len;
 217         const char *hid;
 218         int err;
 219
 220         if (acpi_bus_get_device(handle, &device))
 221                 return -ENODEV;
 222
 223         if (acpi_bus_get_status(device) || !device->status.present)
 224                 return -ENODEV;
 225
 226         hid = acpi_device_hid(device);
 227
 228         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 229         if (!iomem)
 230                 return -ENOMEM;
 231
 232         len = resource_size(iomem);
 233         if (len < 0x100)
 234                 dev_err(dev, "Invalid iomem size!\n");
 235
 236         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 237                 return -ENOMEM;
 238
 239         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 240         if (IS_ERR(host))
 241                 return PTR_ERR(host);
 242
 243         c = sdhci_priv(host);
 244         c->host = host;
 245         c->slot = sdhci_acpi_get_slot(handle, hid);
 246         c->pdev = pdev;
 247         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 248
 249         platform_set_drvdata(pdev, c);
 250
 251         host->hw_name   = "ACPI";
 252         host->ops       = &sdhci_acpi_ops_dflt;
 253         host->irq       = platform_get_irq(pdev, 0);
 254
 255         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 256                                             resource_size(iomem));
 257         if (host->ioaddr == NULL) {
 258                 err = -ENOMEM;
 259                 goto err_free;
 260         }
 261
 262         if (!dev->dma_mask) {
 263                 u64 dma_mask;
 264
 265                 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
 266                         /* 64-bit DMA is not supported at present */
 267                         dma_mask = DMA_BIT_MASK(32);
 268                 } else {
 269                         dma_mask = DMA_BIT_MASK(32);
 270                 }
 271
 272                 err = dma_coerce_mask_and_coherent(dev, dma_mask);
 273                 if (err)
 274                         goto err_free;
 275         }
 276
 277         if (c->slot) {
 278                 if (c->slot->chip) {
 279                         host->ops            = c->slot->chip->ops;
 280                         host->quirks        |= c->slot->chip->quirks;
 281                         host->quirks2       |= c->slot->chip->quirks2;
 282                         host->mmc->caps     |= c->slot->chip->caps;
 283                         host->mmc->caps2    |= c->slot->chip->caps2;
 284                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 285                 }
 286                 host->quirks        |= c->slot->quirks;
 287                 host->quirks2       |= c->slot->quirks2;
 288                 host->mmc->caps     |= c->slot->caps;
 289                 host->mmc->caps2    |= c->slot->caps2;
 290                 host->mmc->pm_caps  |= c->slot->pm_caps;
 291         }
 292
 293         host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 294
 295         if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 296                 bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
 297
 298                 if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0)) {
 299                         dev_warn(dev, "failed to setup card detect gpio\n");
 300                         c->use_runtime_pm = false;
 301                 }
 302         }
 303
 304         err = sdhci_add_host(host);
 305         if (err)
 306                 goto err_free;
 307
 308         if (c->use_runtime_pm) {
 309                 pm_runtime_set_active(dev);
 310                 pm_suspend_ignore_children(dev, 1);
 311                 pm_runtime_set_autosuspend_delay(dev, 50);
 312                 pm_runtime_use_autosuspend(dev);
 313                 pm_runtime_enable(dev);
 314         }
 315
 316         return 0;
 317
 318 err_free:
 319         sdhci_free_host(c->host);
 320         return err;
 321 }
 322
 323 static int sdhci_acpi_remove(struct platform_device *pdev)
 324 {
 325         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 326         struct device *dev = &pdev->dev;
 327         int dead;
 328
 329         if (c->use_runtime_pm) {
 330                 pm_runtime_get_sync(dev);
 331                 pm_runtime_disable(dev);
 332                 pm_runtime_put_noidle(dev);
 333         }
 334
 335         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 336         sdhci_remove_host(c->host, dead);
 337         sdhci_free_host(c->host);
 338
 339         return 0;
 340 }
 341
 342 #ifdef CONFIG_PM_SLEEP
 343
 344 static int sdhci_acpi_suspend(struct device *dev)
 345 {
 346         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 347
 348         return sdhci_suspend_host(c->host);
 349 }
 350
 351 static int sdhci_acpi_resume(struct device *dev)
 352 {
 353         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 354
 355         return sdhci_resume_host(c->host);
 356 }
 357
 358 #else
 359
 360 #define sdhci_acpi_suspend      NULL
 361 #define sdhci_acpi_resume       NULL
 362
 363 #endif
 364
 365 #ifdef CONFIG_PM_RUNTIME
 366
 367 static int sdhci_acpi_runtime_suspend(struct device *dev)
 368 {
 369         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 370
 371         return sdhci_runtime_suspend_host(c->host);
 372 }
 373
 374 static int sdhci_acpi_runtime_resume(struct device *dev)
 375 {
 376         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 377
 378         return sdhci_runtime_resume_host(c->host);
 379 }
 380
 381 static int sdhci_acpi_runtime_idle(struct device *dev)
 382 {
 383         return 0;
 384 }
 385
 386 #else
 387
 388 #define sdhci_acpi_runtime_suspend      NULL
 389 #define sdhci_acpi_runtime_resume       NULL
 390 #define sdhci_acpi_runtime_idle         NULL
 391
 392 #endif
 393
 394 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 395         .suspend                = sdhci_acpi_suspend,
 396         .resume                 = sdhci_acpi_resume,
 397         .runtime_suspend        = sdhci_acpi_runtime_suspend,
 398         .runtime_resume         = sdhci_acpi_runtime_resume,
 399         .runtime_idle           = sdhci_acpi_runtime_idle,
 400 };
 401
 402 static struct platform_driver sdhci_acpi_driver = {
 403         .driver = {
 404                 .name                   = "sdhci-acpi",
 405                 .owner                  = THIS_MODULE,
 406                 .acpi_match_table       = sdhci_acpi_ids,
 407                 .pm                     = &sdhci_acpi_pm_ops,
 408         },
 409         .probe  = sdhci_acpi_probe,
 410         .remove = sdhci_acpi_remove,
 411 };
 412
 413 module_platform_driver(sdhci_acpi_driver);
 414
 415 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 416 MODULE_AUTHOR("Adrian Hunter");
 417 MODULE_LICENSE("GPL v2");