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         int (*probe_slot)(struct platform_device *, const char *, const char *);
  71         int (*remove_slot)(struct platform_device *);
  72 };
  73
  74 struct sdhci_acpi_host {
  75         struct sdhci_host               *host;
  76         const struct sdhci_acpi_slot    *slot;
  77         struct platform_device          *pdev;
  78         bool                            use_runtime_pm;
  79         bool                            dma_setup;
  80 };
  81
  82 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
  83 {
  84         return c->slot && (c->slot->flags & flag);
  85 }
  86
  87 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
  88 {
  89         struct sdhci_acpi_host *c = sdhci_priv(host);
  90         struct device *dev = &c->pdev->dev;
  91         int err = -1;
  92
  93         if (c->dma_setup)
  94                 return 0;
  95
  96         if (host->flags & SDHCI_USE_64_BIT_DMA) {
  97                 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) {
  98                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
  99                 } else {
 100                         err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 101                         if (err)
 102                                 dev_warn(dev, "Failed to set 64-bit DMA mask\n");
 103                 }
 104         }
 105
 106         if (err)
 107                 err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 108
 109         c->dma_setup = !err;
 110
 111         return err;
 112 }
 113
 114 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
 115 {
 116         u8 reg;
 117
 118         reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
 119         reg |= 0x10;
 120         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 121         /* For eMMC, minimum is 1us but give it 9us for good measure */
 122         udelay(9);
 123         reg &= ~0x10;
 124         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 125         /* For eMMC, minimum is 200us but give it 300us for good measure */
 126         usleep_range(300, 1000);
 127 }
 128
 129 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
 130         .set_clock = sdhci_set_clock,
 131         .enable_dma = sdhci_acpi_enable_dma,
 132         .set_bus_width = sdhci_set_bus_width,
 133         .reset = sdhci_reset,
 134         .set_uhs_signaling = sdhci_set_uhs_signaling,
 135 };
 136
 137 static const struct sdhci_ops sdhci_acpi_ops_int = {
 138         .set_clock = sdhci_set_clock,
 139         .enable_dma = sdhci_acpi_enable_dma,
 140         .set_bus_width = sdhci_set_bus_width,
 141         .reset = sdhci_reset,
 142         .set_uhs_signaling = sdhci_set_uhs_signaling,
 143         .hw_reset   = sdhci_acpi_int_hw_reset,
 144 };
 145
 146 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
 147         .ops = &sdhci_acpi_ops_int,
 148 };
 149
 150 static int sdhci_acpi_emmc_probe_slot(struct platform_device *pdev,
 151                                       const char *hid, const char *uid)
 152 {
 153         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 154         struct sdhci_host *host;
 155
 156         if (!c || !c->host)
 157                 return 0;
 158
 159         host = c->host;
 160
 161         /* Platform specific code during emmc proble slot goes here */
 162
 163         if (hid && uid && !strcmp(hid, "80860F14") && !strcmp(uid, "1") &&
 164             sdhci_readl(host, SDHCI_CAPABILITIES) == 0x446cc8b2 &&
 165             sdhci_readl(host, SDHCI_CAPABILITIES_1) == 0x00000807)
 166                 host->timeout_clk = 1000; /* 1000 kHz i.e. 1 MHz */
 167
 168         return 0;
 169 }
 170
 171 static int sdhci_acpi_sdio_probe_slot(struct platform_device *pdev,
 172                                       const char *hid, const char *uid)
 173 {
 174         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 175         struct sdhci_host *host;
 176
 177         if (!c || !c->host)
 178                 return 0;
 179
 180         host = c->host;
 181
 182         /* Platform specific code during emmc proble slot goes here */
 183
 184         return 0;
 185 }
 186
 187 static int sdhci_acpi_sd_probe_slot(struct platform_device *pdev,
 188                                     const char *hid, const char *uid)
 189 {
 190         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 191         struct sdhci_host *host;
 192
 193         if (!c || !c->host || !c->slot)
 194                 return 0;
 195
 196         host = c->host;
 197
 198         /* Platform specific code during emmc proble slot goes here */
 199
 200         return 0;
 201 }
 202
 203 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
 204         .chip    = &sdhci_acpi_chip_int,
 205         .caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE |
 206                    MMC_CAP_HW_RESET | MMC_CAP_1_8V_DDR |
 207                    MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 208         .caps2   = MMC_CAP2_HC_ERASE_SZ,
 209         .flags   = SDHCI_ACPI_RUNTIME_PM,
 210         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 211         .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | SDHCI_QUIRK2_STOP_WITH_TC,
 212         .probe_slot     = sdhci_acpi_emmc_probe_slot,
 213 };
 214
 215 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
 216         .quirks  = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
 217                    SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 218         .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
 219         .caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD |
 220                    MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 221         .flags   = SDHCI_ACPI_RUNTIME_PM,
 222         .pm_caps = MMC_PM_KEEP_POWER,
 223         .probe_slot     = sdhci_acpi_sdio_probe_slot,
 224 };
 225
 226 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
 227         .flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
 228                    SDHCI_ACPI_RUNTIME_PM,
 229         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 230         .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
 231                    SDHCI_QUIRK2_STOP_WITH_TC,
 232         .caps    = MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 233         .probe_slot     = sdhci_acpi_sd_probe_slot,
 234 };
 235
 236 struct sdhci_acpi_uid_slot {
 237         const char *hid;
 238         const char *uid;
 239         const struct sdhci_acpi_slot *slot;
 240 };
 241
 242 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
 243         { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
 244         { "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
 245         { "80860F16" , NULL, &sdhci_acpi_slot_int_sd   },
 246         { "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
 247         { "INT33BB"  , "3" , &sdhci_acpi_slot_int_sd },
 248         { "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
 249         { "INT3436"  , 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         { "PNP0D40"  },
 261         { },
 262 };
 263 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 264
 265 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid,
 266                                                          const char *uid)
 267 {
 268         const struct sdhci_acpi_uid_slot *u;
 269
 270         for (u = sdhci_acpi_uids; u->hid; u++) {
 271                 if (strcmp(u->hid, hid))
 272                         continue;
 273                 if (!u->uid)
 274                         return u->slot;
 275                 if (uid && !strcmp(u->uid, uid))
 276                         return u->slot;
 277         }
 278         return NULL;
 279 }
 280
 281 static int sdhci_acpi_probe(struct platform_device *pdev)
 282 {
 283         struct device *dev = &pdev->dev;
 284         acpi_handle handle = ACPI_HANDLE(dev);
 285         struct acpi_device *device;
 286         struct sdhci_acpi_host *c;
 287         struct sdhci_host *host;
 288         struct resource *iomem;
 289         resource_size_t len;
 290         const char *hid;
 291         const char *uid;
 292         int err;
 293
 294         if (acpi_bus_get_device(handle, &device))
 295                 return -ENODEV;
 296
 297         if (acpi_bus_get_status(device) || !device->status.present)
 298                 return -ENODEV;
 299
 300         hid = acpi_device_hid(device);
 301         uid = device->pnp.unique_id;
 302
 303         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 304         if (!iomem)
 305                 return -ENOMEM;
 306
 307         len = resource_size(iomem);
 308         if (len < 0x100)
 309                 dev_err(dev, "Invalid iomem size!\n");
 310
 311         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 312                 return -ENOMEM;
 313
 314         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 315         if (IS_ERR(host))
 316                 return PTR_ERR(host);
 317
 318         c = sdhci_priv(host);
 319         c->host = host;
 320         c->slot = sdhci_acpi_get_slot(hid, uid);
 321         c->pdev = pdev;
 322         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 323
 324         platform_set_drvdata(pdev, c);
 325
 326         host->hw_name   = "ACPI";
 327         host->ops       = &sdhci_acpi_ops_dflt;
 328         host->irq       = platform_get_irq(pdev, 0);
 329
 330         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 331                                             resource_size(iomem));
 332         if (host->ioaddr == NULL) {
 333                 err = -ENOMEM;
 334                 goto err_free;
 335         }
 336
 337         if (c->slot) {
 338                 if (c->slot->probe_slot) {
 339                         err = c->slot->probe_slot(pdev, hid, uid);
 340                         if (err)
 341                                 goto err_free;
 342                 }
 343                 if (c->slot->chip) {
 344                         host->ops            = c->slot->chip->ops;
 345                         host->quirks        |= c->slot->chip->quirks;
 346                         host->quirks2       |= c->slot->chip->quirks2;
 347                         host->mmc->caps     |= c->slot->chip->caps;
 348                         host->mmc->caps2    |= c->slot->chip->caps2;
 349                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 350                 }
 351                 host->quirks        |= c->slot->quirks;
 352                 host->quirks2       |= c->slot->quirks2;
 353                 host->mmc->caps     |= c->slot->caps;
 354                 host->mmc->caps2    |= c->slot->caps2;
 355                 host->mmc->pm_caps  |= c->slot->pm_caps;
 356         }
 357
 358         host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 359
 360         if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 361                 bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
 362
 363                 if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
 364                         dev_warn(dev, "failed to setup card detect gpio\n");
 365                         c->use_runtime_pm = false;
 366                 }
 367         }
 368
 369         err = sdhci_add_host(host);
 370         if (err)
 371                 goto err_free;
 372
 373         if (c->use_runtime_pm) {
 374                 pm_runtime_set_active(dev);
 375                 pm_suspend_ignore_children(dev, 1);
 376                 pm_runtime_set_autosuspend_delay(dev, 50);
 377                 pm_runtime_use_autosuspend(dev);
 378                 pm_runtime_enable(dev);
 379         }
 380
 381         return 0;
 382
 383 err_free:
 384         sdhci_free_host(c->host);
 385         return err;
 386 }
 387
 388 static int sdhci_acpi_remove(struct platform_device *pdev)
 389 {
 390         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 391         struct device *dev = &pdev->dev;
 392         int dead;
 393
 394         if (c->use_runtime_pm) {
 395                 pm_runtime_get_sync(dev);
 396                 pm_runtime_disable(dev);
 397                 pm_runtime_put_noidle(dev);
 398         }
 399
 400         if (c->slot && c->slot->remove_slot)
 401                 c->slot->remove_slot(pdev);
 402
 403         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 404         sdhci_remove_host(c->host, dead);
 405         sdhci_free_host(c->host);
 406
 407         return 0;
 408 }
 409
 410 #ifdef CONFIG_PM_SLEEP
 411
 412 static int sdhci_acpi_suspend(struct device *dev)
 413 {
 414         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 415
 416         return sdhci_suspend_host(c->host);
 417 }
 418
 419 static int sdhci_acpi_resume(struct device *dev)
 420 {
 421         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 422
 423         return sdhci_resume_host(c->host);
 424 }
 425
 426 #else
 427
 428 #define sdhci_acpi_suspend      NULL
 429 #define sdhci_acpi_resume       NULL
 430
 431 #endif
 432
 433 #ifdef CONFIG_PM
 434
 435 static int sdhci_acpi_runtime_suspend(struct device *dev)
 436 {
 437         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 438
 439         return sdhci_runtime_suspend_host(c->host);
 440 }
 441
 442 static int sdhci_acpi_runtime_resume(struct device *dev)
 443 {
 444         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 445
 446         return sdhci_runtime_resume_host(c->host);
 447 }
 448
 449 static int sdhci_acpi_runtime_idle(struct device *dev)
 450 {
 451         return 0;
 452 }
 453
 454 #endif
 455
 456 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 457         .suspend                = sdhci_acpi_suspend,
 458         .resume                 = sdhci_acpi_resume,
 459         SET_RUNTIME_PM_OPS(sdhci_acpi_runtime_suspend,
 460                         sdhci_acpi_runtime_resume, sdhci_acpi_runtime_idle)
 461 };
 462
 463 static struct platform_driver sdhci_acpi_driver = {
 464         .driver = {
 465                 .name                   = "sdhci-acpi",
 466                 .owner                  = THIS_MODULE,
 467                 .acpi_match_table       = sdhci_acpi_ids,
 468                 .pm                     = &sdhci_acpi_pm_ops,
 469         },
 470         .probe  = sdhci_acpi_probe,
 471         .remove = sdhci_acpi_remove,
 472 };
 473
 474 module_platform_driver(sdhci_acpi_driver);
 475
 476 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 477 MODULE_AUTHOR("Adrian Hunter");
 478 MODULE_LICENSE("GPL v2");