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
  44 #include "sdhci.h"
  45
  46 enum {
  47         SDHCI_ACPI_SD_CD                = BIT(0),
  48         SDHCI_ACPI_RUNTIME_PM           = BIT(1),
  49         SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL = BIT(2),
  50 };
  51
  52 struct sdhci_acpi_chip {
  53         const struct    sdhci_ops *ops;
  54         unsigned int    quirks;
  55         unsigned int    quirks2;
  56         unsigned long   caps;
  57         unsigned int    caps2;
  58         mmc_pm_flag_t   pm_caps;
  59 };
  60
  61 struct sdhci_acpi_slot {
  62         const struct    sdhci_acpi_chip *chip;
  63         unsigned int    quirks;
  64         unsigned int    quirks2;
  65         unsigned long   caps;
  66         unsigned int    caps2;
  67         mmc_pm_flag_t   pm_caps;
  68         unsigned int    flags;
  69         int (*probe_slot)(struct platform_device *, const char *, const char *);
  70         int (*remove_slot)(struct platform_device *);
  71 };
  72
  73 struct sdhci_acpi_host {
  74         struct sdhci_host               *host;
  75         const struct sdhci_acpi_slot    *slot;
  76         struct platform_device          *pdev;
  77         bool                            use_runtime_pm;
  78         bool                            dma_setup;
  79 };
  80
  81 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
  82 {
  83         return c->slot && (c->slot->flags & flag);
  84 }
  85
  86 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
  87 {
  88         struct sdhci_acpi_host *c = sdhci_priv(host);
  89         struct device *dev = &c->pdev->dev;
  90         int err = -1;
  91
  92         if (c->dma_setup)
  93                 return 0;
  94
  95         if (host->flags & SDHCI_USE_64_BIT_DMA) {
  96                 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) {
  97                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
  98                 } else {
  99                         err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 100                         if (err)
 101                                 dev_warn(dev, "Failed to set 64-bit DMA mask\n");
 102                 }
 103         }
 104
 105         if (err)
 106                 err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 107
 108         c->dma_setup = !err;
 109
 110         return err;
 111 }
 112
 113 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
 114 {
 115         u8 reg;
 116
 117         reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
 118         reg |= 0x10;
 119         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 120         /* For eMMC, minimum is 1us but give it 9us for good measure */
 121         udelay(9);
 122         reg &= ~0x10;
 123         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 124         /* For eMMC, minimum is 200us but give it 300us for good measure */
 125         usleep_range(300, 1000);
 126 }
 127
 128 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
 129         .set_clock = sdhci_set_clock,
 130         .enable_dma = sdhci_acpi_enable_dma,
 131         .set_bus_width = sdhci_set_bus_width,
 132         .reset = sdhci_reset,
 133         .set_uhs_signaling = sdhci_set_uhs_signaling,
 134 };
 135
 136 static const struct sdhci_ops sdhci_acpi_ops_int = {
 137         .set_clock = sdhci_set_clock,
 138         .enable_dma = sdhci_acpi_enable_dma,
 139         .set_bus_width = sdhci_set_bus_width,
 140         .reset = sdhci_reset,
 141         .set_uhs_signaling = sdhci_set_uhs_signaling,
 142         .hw_reset   = sdhci_acpi_int_hw_reset,
 143 };
 144
 145 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
 146         .ops = &sdhci_acpi_ops_int,
 147 };
 148
 149 static int sdhci_acpi_emmc_probe_slot(struct platform_device *pdev,
 150                                       const char *hid, const char *uid)
 151 {
 152         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 153         struct sdhci_host *host;
 154
 155         if (!c || !c->host)
 156                 return 0;
 157
 158         host = c->host;
 159
 160         /* Platform specific code during emmc probe slot goes here */
 161
 162         if (hid && uid && !strcmp(hid, "80860F14") && !strcmp(uid, "1") &&
 163             sdhci_readl(host, SDHCI_CAPABILITIES) == 0x446cc8b2 &&
 164             sdhci_readl(host, SDHCI_CAPABILITIES_1) == 0x00000807)
 165                 host->timeout_clk = 1000; /* 1000 kHz i.e. 1 MHz */
 166
 167         return 0;
 168 }
 169
 170 static int sdhci_acpi_sdio_probe_slot(struct platform_device *pdev,
 171                                       const char *hid, const char *uid)
 172 {
 173         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 174         struct sdhci_host *host;
 175
 176         if (!c || !c->host)
 177                 return 0;
 178
 179         host = c->host;
 180
 181         /* Platform specific code during sdio probe slot goes here */
 182
 183         return 0;
 184 }
 185
 186 static int sdhci_acpi_sd_probe_slot(struct platform_device *pdev,
 187                                     const char *hid, const char *uid)
 188 {
 189         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 190         struct sdhci_host *host;
 191
 192         if (!c || !c->host || !c->slot)
 193                 return 0;
 194
 195         host = c->host;
 196
 197         /* Platform specific code during sd probe slot goes here */
 198
 199         return 0;
 200 }
 201
 202 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
 203         .chip    = &sdhci_acpi_chip_int,
 204         .caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE |
 205                    MMC_CAP_HW_RESET | MMC_CAP_1_8V_DDR |
 206                    MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 207         .caps2   = MMC_CAP2_HC_ERASE_SZ,
 208         .flags   = SDHCI_ACPI_RUNTIME_PM,
 209         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 210         .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | SDHCI_QUIRK2_STOP_WITH_TC,
 211         .probe_slot     = sdhci_acpi_emmc_probe_slot,
 212 };
 213
 214 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
 215         .quirks  = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
 216                    SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 217         .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
 218         .caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD |
 219                    MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 220         .flags   = SDHCI_ACPI_RUNTIME_PM,
 221         .pm_caps = MMC_PM_KEEP_POWER,
 222         .probe_slot     = sdhci_acpi_sdio_probe_slot,
 223 };
 224
 225 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
 226         .flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
 227                    SDHCI_ACPI_RUNTIME_PM,
 228         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 229         .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
 230                    SDHCI_QUIRK2_STOP_WITH_TC,
 231         .caps    = MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 232         .probe_slot     = sdhci_acpi_sd_probe_slot,
 233 };
 234
 235 struct sdhci_acpi_uid_slot {
 236         const char *hid;
 237         const char *uid;
 238         const struct sdhci_acpi_slot *slot;
 239 };
 240
 241 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
 242         { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
 243         { "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
 244         { "80860F16" , NULL, &sdhci_acpi_slot_int_sd   },
 245         { "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
 246         { "INT33BB"  , "3" , &sdhci_acpi_slot_int_sd },
 247         { "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
 248         { "INT3436"  , NULL, &sdhci_acpi_slot_int_sdio },
 249         { "INT344D"  , NULL, &sdhci_acpi_slot_int_sdio },
 250         { "PNP0D40"  },
 251         { },
 252 };
 253
 254 static const struct acpi_device_id sdhci_acpi_ids[] = {
 255         { "80860F14" },
 256         { "80860F16" },
 257         { "INT33BB"  },
 258         { "INT33C6"  },
 259         { "INT3436"  },
 260         { "INT344D"  },
 261         { "PNP0D40"  },
 262         { },
 263 };
 264 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 265
 266 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid,
 267                                                          const char *uid)
 268 {
 269         const struct sdhci_acpi_uid_slot *u;
 270
 271         for (u = sdhci_acpi_uids; u->hid; u++) {
 272                 if (strcmp(u->hid, hid))
 273                         continue;
 274                 if (!u->uid)
 275                         return u->slot;
 276                 if (uid && !strcmp(u->uid, uid))
 277                         return u->slot;
 278         }
 279         return NULL;
 280 }
 281
 282 static int sdhci_acpi_probe(struct platform_device *pdev)
 283 {
 284         struct device *dev = &pdev->dev;
 285         acpi_handle handle = ACPI_HANDLE(dev);
 286         struct acpi_device *device;
 287         struct sdhci_acpi_host *c;
 288         struct sdhci_host *host;
 289         struct resource *iomem;
 290         resource_size_t len;
 291         const char *hid;
 292         const char *uid;
 293         int err;
 294
 295         if (acpi_bus_get_device(handle, &device))
 296                 return -ENODEV;
 297
 298         if (acpi_bus_get_status(device) || !device->status.present)
 299                 return -ENODEV;
 300
 301         hid = acpi_device_hid(device);
 302         uid = device->pnp.unique_id;
 303
 304         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 305         if (!iomem)
 306                 return -ENOMEM;
 307
 308         len = resource_size(iomem);
 309         if (len < 0x100)
 310                 dev_err(dev, "Invalid iomem size!\n");
 311
 312         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 313                 return -ENOMEM;
 314
 315         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 316         if (IS_ERR(host))
 317                 return PTR_ERR(host);
 318
 319         c = sdhci_priv(host);
 320         c->host = host;
 321         c->slot = sdhci_acpi_get_slot(hid, uid);
 322         c->pdev = pdev;
 323         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 324
 325         platform_set_drvdata(pdev, c);
 326
 327         host->hw_name   = "ACPI";
 328         host->ops       = &sdhci_acpi_ops_dflt;
 329         host->irq       = platform_get_irq(pdev, 0);
 330
 331         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 332                                             resource_size(iomem));
 333         if (host->ioaddr == NULL) {
 334                 err = -ENOMEM;
 335                 goto err_free;
 336         }
 337
 338         if (c->slot) {
 339                 if (c->slot->probe_slot) {
 340                         err = c->slot->probe_slot(pdev, hid, uid);
 341                         if (err)
 342                                 goto err_free;
 343                 }
 344                 if (c->slot->chip) {
 345                         host->ops            = c->slot->chip->ops;
 346                         host->quirks        |= c->slot->chip->quirks;
 347                         host->quirks2       |= c->slot->chip->quirks2;
 348                         host->mmc->caps     |= c->slot->chip->caps;
 349                         host->mmc->caps2    |= c->slot->chip->caps2;
 350                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 351                 }
 352                 host->quirks        |= c->slot->quirks;
 353                 host->quirks2       |= c->slot->quirks2;
 354                 host->mmc->caps     |= c->slot->caps;
 355                 host->mmc->caps2    |= c->slot->caps2;
 356                 host->mmc->pm_caps  |= c->slot->pm_caps;
 357         }
 358
 359         host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 360
 361         if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 362                 bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
 363
 364                 if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
 365                         dev_warn(dev, "failed to setup card detect gpio\n");
 366                         c->use_runtime_pm = false;
 367                 }
 368         }
 369
 370         err = sdhci_add_host(host);
 371         if (err)
 372                 goto err_free;
 373
 374         if (c->use_runtime_pm) {
 375                 pm_runtime_set_active(dev);
 376                 pm_suspend_ignore_children(dev, 1);
 377                 pm_runtime_set_autosuspend_delay(dev, 50);
 378                 pm_runtime_use_autosuspend(dev);
 379                 pm_runtime_enable(dev);
 380         }
 381
 382         return 0;
 383
 384 err_free:
 385         sdhci_free_host(c->host);
 386         return err;
 387 }
 388
 389 static int sdhci_acpi_remove(struct platform_device *pdev)
 390 {
 391         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 392         struct device *dev = &pdev->dev;
 393         int dead;
 394
 395         if (c->use_runtime_pm) {
 396                 pm_runtime_get_sync(dev);
 397                 pm_runtime_disable(dev);
 398                 pm_runtime_put_noidle(dev);
 399         }
 400
 401         if (c->slot && c->slot->remove_slot)
 402                 c->slot->remove_slot(pdev);
 403
 404         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 405         sdhci_remove_host(c->host, dead);
 406         sdhci_free_host(c->host);
 407
 408         return 0;
 409 }
 410
 411 #ifdef CONFIG_PM_SLEEP
 412
 413 static int sdhci_acpi_suspend(struct device *dev)
 414 {
 415         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 416
 417         return sdhci_suspend_host(c->host);
 418 }
 419
 420 static int sdhci_acpi_resume(struct device *dev)
 421 {
 422         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 423
 424         return sdhci_resume_host(c->host);
 425 }
 426
 427 #else
 428
 429 #define sdhci_acpi_suspend      NULL
 430 #define sdhci_acpi_resume       NULL
 431
 432 #endif
 433
 434 #ifdef CONFIG_PM
 435
 436 static int sdhci_acpi_runtime_suspend(struct device *dev)
 437 {
 438         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 439
 440         return sdhci_runtime_suspend_host(c->host);
 441 }
 442
 443 static int sdhci_acpi_runtime_resume(struct device *dev)
 444 {
 445         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 446
 447         return sdhci_runtime_resume_host(c->host);
 448 }
 449
 450 #endif
 451
 452 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 453         .suspend                = sdhci_acpi_suspend,
 454         .resume                 = sdhci_acpi_resume,
 455         SET_RUNTIME_PM_OPS(sdhci_acpi_runtime_suspend,
 456                         sdhci_acpi_runtime_resume, NULL)
 457 };
 458
 459 static struct platform_driver sdhci_acpi_driver = {
 460         .driver = {
 461                 .name                   = "sdhci-acpi",
 462                 .acpi_match_table       = sdhci_acpi_ids,
 463                 .pm                     = &sdhci_acpi_pm_ops,
 464         },
 465         .probe  = sdhci_acpi_probe,
 466         .remove = sdhci_acpi_remove,
 467 };
 468
 469 module_platform_driver(sdhci_acpi_driver);
 470
 471 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 472 MODULE_AUTHOR("Adrian Hunter");
 473 MODULE_LICENSE("GPL v2");