kernel/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 bxt_get_cd(struct mmc_host *mmc)
 150 {
 151         int gpio_cd = mmc_gpio_get_cd(mmc);
 152         struct sdhci_host *host = mmc_priv(mmc);
 153         unsigned long flags;
 154         int ret = 0;
 155
 156         if (!gpio_cd)
 157                 return 0;
 158
 159         pm_runtime_get_sync(mmc->parent);
 160
 161         spin_lock_irqsave(&host->lock, flags);
 162
 163         if (host->flags & SDHCI_DEVICE_DEAD)
 164                 goto out;
 165
 166         ret = !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
 167 out:
 168         spin_unlock_irqrestore(&host->lock, flags);
 169
 170         pm_runtime_mark_last_busy(mmc->parent);
 171         pm_runtime_put_autosuspend(mmc->parent);
 172
 173         return ret;
 174 }
 175
 176 static int sdhci_acpi_emmc_probe_slot(struct platform_device *pdev,
 177                                       const char *hid, const char *uid)
 178 {
 179         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 180         struct sdhci_host *host;
 181
 182         if (!c || !c->host)
 183                 return 0;
 184
 185         host = c->host;
 186
 187         /* Platform specific code during emmc probe slot goes here */
 188
 189         if (hid && uid && !strcmp(hid, "80860F14") && !strcmp(uid, "1") &&
 190             sdhci_readl(host, SDHCI_CAPABILITIES) == 0x446cc8b2 &&
 191             sdhci_readl(host, SDHCI_CAPABILITIES_1) == 0x00000807)
 192                 host->timeout_clk = 1000; /* 1000 kHz i.e. 1 MHz */
 193
 194         return 0;
 195 }
 196
 197 static int sdhci_acpi_sdio_probe_slot(struct platform_device *pdev,
 198                                       const char *hid, const char *uid)
 199 {
 200         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 201         struct sdhci_host *host;
 202
 203         if (!c || !c->host)
 204                 return 0;
 205
 206         host = c->host;
 207
 208         /* Platform specific code during sdio probe slot goes here */
 209
 210         return 0;
 211 }
 212
 213 static int sdhci_acpi_sd_probe_slot(struct platform_device *pdev,
 214                                     const char *hid, const char *uid)
 215 {
 216         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 217         struct sdhci_host *host;
 218
 219         if (!c || !c->host || !c->slot)
 220                 return 0;
 221
 222         host = c->host;
 223
 224         /* Platform specific code during sd probe slot goes here */
 225
 226         if (hid && !strcmp(hid, "80865ACA"))
 227                 host->mmc_host_ops.get_cd = bxt_get_cd;
 228
 229         return 0;
 230 }
 231
 232 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
 233         .chip    = &sdhci_acpi_chip_int,
 234         .caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE |
 235                    MMC_CAP_HW_RESET | MMC_CAP_1_8V_DDR |
 236                    MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 237         .caps2   = MMC_CAP2_HC_ERASE_SZ,
 238         .flags   = SDHCI_ACPI_RUNTIME_PM,
 239         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 240         .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
 241                    SDHCI_QUIRK2_STOP_WITH_TC |
 242                    SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400,
 243         .probe_slot     = sdhci_acpi_emmc_probe_slot,
 244 };
 245
 246 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
 247         .quirks  = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
 248                    SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 249         .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
 250         .caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD |
 251                    MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 252         .flags   = SDHCI_ACPI_RUNTIME_PM,
 253         .pm_caps = MMC_PM_KEEP_POWER,
 254         .probe_slot     = sdhci_acpi_sdio_probe_slot,
 255 };
 256
 257 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
 258         .flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
 259                    SDHCI_ACPI_RUNTIME_PM,
 260         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 261         .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
 262                    SDHCI_QUIRK2_STOP_WITH_TC,
 263         .caps    = MMC_CAP_BUS_WIDTH_TEST | MMC_CAP_WAIT_WHILE_BUSY,
 264         .probe_slot     = sdhci_acpi_sd_probe_slot,
 265 };
 266
 267 struct sdhci_acpi_uid_slot {
 268         const char *hid;
 269         const char *uid;
 270         const struct sdhci_acpi_slot *slot;
 271 };
 272
 273 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
 274         { "80865ACA", NULL, &sdhci_acpi_slot_int_sd },
 275         { "80865ACC", NULL, &sdhci_acpi_slot_int_emmc },
 276         { "80865AD0", NULL, &sdhci_acpi_slot_int_sdio },
 277         { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
 278         { "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
 279         { "80860F16" , NULL, &sdhci_acpi_slot_int_sd   },
 280         { "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
 281         { "INT33BB"  , "3" , &sdhci_acpi_slot_int_sd },
 282         { "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
 283         { "INT3436"  , NULL, &sdhci_acpi_slot_int_sdio },
 284         { "INT344D"  , NULL, &sdhci_acpi_slot_int_sdio },
 285         { "PNP0FFF"  , "3" , &sdhci_acpi_slot_int_sd   },
 286         { "PNP0D40"  },
 287         { },
 288 };
 289
 290 static const struct acpi_device_id sdhci_acpi_ids[] = {
 291         { "80865ACA" },
 292         { "80865ACC" },
 293         { "80865AD0" },
 294         { "80860F14" },
 295         { "80860F16" },
 296         { "INT33BB"  },
 297         { "INT33C6"  },
 298         { "INT3436"  },
 299         { "INT344D"  },
 300         { "PNP0D40"  },
 301         { },
 302 };
 303 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 304
 305 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid,
 306                                                          const char *uid)
 307 {
 308         const struct sdhci_acpi_uid_slot *u;
 309
 310         for (u = sdhci_acpi_uids; u->hid; u++) {
 311                 if (strcmp(u->hid, hid))
 312                         continue;
 313                 if (!u->uid)
 314                         return u->slot;
 315                 if (uid && !strcmp(u->uid, uid))
 316                         return u->slot;
 317         }
 318         return NULL;
 319 }
 320
 321 static int sdhci_acpi_probe(struct platform_device *pdev)
 322 {
 323         struct device *dev = &pdev->dev;
 324         acpi_handle handle = ACPI_HANDLE(dev);
 325         struct acpi_device *device;
 326         struct sdhci_acpi_host *c;
 327         struct sdhci_host *host;
 328         struct resource *iomem;
 329         resource_size_t len;
 330         const char *hid;
 331         const char *uid;
 332         int err;
 333
 334         if (acpi_bus_get_device(handle, &device))
 335                 return -ENODEV;
 336
 337         if (acpi_bus_get_status(device) || !device->status.present)
 338                 return -ENODEV;
 339
 340         hid = acpi_device_hid(device);
 341         uid = device->pnp.unique_id;
 342
 343         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 344         if (!iomem)
 345                 return -ENOMEM;
 346
 347         len = resource_size(iomem);
 348         if (len < 0x100)
 349                 dev_err(dev, "Invalid iomem size!\n");
 350
 351         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 352                 return -ENOMEM;
 353
 354         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 355         if (IS_ERR(host))
 356                 return PTR_ERR(host);
 357
 358         c = sdhci_priv(host);
 359         c->host = host;
 360         c->slot = sdhci_acpi_get_slot(hid, uid);
 361         c->pdev = pdev;
 362         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 363
 364         platform_set_drvdata(pdev, c);
 365
 366         host->hw_name   = "ACPI";
 367         host->ops       = &sdhci_acpi_ops_dflt;
 368         host->irq       = platform_get_irq(pdev, 0);
 369
 370         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 371                                             resource_size(iomem));
 372         if (host->ioaddr == NULL) {
 373                 err = -ENOMEM;
 374                 goto err_free;
 375         }
 376
 377         if (c->slot) {
 378                 if (c->slot->probe_slot) {
 379                         err = c->slot->probe_slot(pdev, hid, uid);
 380                         if (err)
 381                                 goto err_free;
 382                 }
 383                 if (c->slot->chip) {
 384                         host->ops            = c->slot->chip->ops;
 385                         host->quirks        |= c->slot->chip->quirks;
 386                         host->quirks2       |= c->slot->chip->quirks2;
 387                         host->mmc->caps     |= c->slot->chip->caps;
 388                         host->mmc->caps2    |= c->slot->chip->caps2;
 389                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 390                 }
 391                 host->quirks        |= c->slot->quirks;
 392                 host->quirks2       |= c->slot->quirks2;
 393                 host->mmc->caps     |= c->slot->caps;
 394                 host->mmc->caps2    |= c->slot->caps2;
 395                 host->mmc->pm_caps  |= c->slot->pm_caps;
 396         }
 397
 398         host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 399
 400         if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 401                 bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
 402
 403                 if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
 404                         dev_warn(dev, "failed to setup card detect gpio\n");
 405                         c->use_runtime_pm = false;
 406                 }
 407         }
 408
 409         err = sdhci_add_host(host);
 410         if (err)
 411                 goto err_free;
 412
 413         if (c->use_runtime_pm) {
 414                 pm_runtime_set_active(dev);
 415                 pm_suspend_ignore_children(dev, 1);
 416                 pm_runtime_set_autosuspend_delay(dev, 50);
 417                 pm_runtime_use_autosuspend(dev);
 418                 pm_runtime_enable(dev);
 419         }
 420
 421         return 0;
 422
 423 err_free:
 424         sdhci_free_host(c->host);
 425         return err;
 426 }
 427
 428 static int sdhci_acpi_remove(struct platform_device *pdev)
 429 {
 430         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 431         struct device *dev = &pdev->dev;
 432         int dead;
 433
 434         if (c->use_runtime_pm) {
 435                 pm_runtime_get_sync(dev);
 436                 pm_runtime_disable(dev);
 437                 pm_runtime_put_noidle(dev);
 438         }
 439
 440         if (c->slot && c->slot->remove_slot)
 441                 c->slot->remove_slot(pdev);
 442
 443         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 444         sdhci_remove_host(c->host, dead);
 445         sdhci_free_host(c->host);
 446
 447         return 0;
 448 }
 449
 450 #ifdef CONFIG_PM_SLEEP
 451
 452 static int sdhci_acpi_suspend(struct device *dev)
 453 {
 454         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 455
 456         return sdhci_suspend_host(c->host);
 457 }
 458
 459 static int sdhci_acpi_resume(struct device *dev)
 460 {
 461         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 462
 463         return sdhci_resume_host(c->host);
 464 }
 465
 466 #else
 467
 468 #define sdhci_acpi_suspend      NULL
 469 #define sdhci_acpi_resume       NULL
 470
 471 #endif
 472
 473 #ifdef CONFIG_PM
 474
 475 static int sdhci_acpi_runtime_suspend(struct device *dev)
 476 {
 477         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 478
 479         return sdhci_runtime_suspend_host(c->host);
 480 }
 481
 482 static int sdhci_acpi_runtime_resume(struct device *dev)
 483 {
 484         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 485
 486         return sdhci_runtime_resume_host(c->host);
 487 }
 488
 489 #endif
 490
 491 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 492         .suspend                = sdhci_acpi_suspend,
 493         .resume                 = sdhci_acpi_resume,
 494         SET_RUNTIME_PM_OPS(sdhci_acpi_runtime_suspend,
 495                         sdhci_acpi_runtime_resume, NULL)
 496 };
 497
 498 static struct platform_driver sdhci_acpi_driver = {
 499         .driver = {
 500                 .name                   = "sdhci-acpi",
 501                 .acpi_match_table       = sdhci_acpi_ids,
 502                 .pm                     = &sdhci_acpi_pm_ops,
 503         },
 504         .probe  = sdhci_acpi_probe,
 505         .remove = sdhci_acpi_remove,
 506 };
 507
 508 module_platform_driver(sdhci_acpi_driver);
 509
 510 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 511 MODULE_AUTHOR("Adrian Hunter");
 512 MODULE_LICENSE("GPL v2");