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 #ifdef CONFIG_X86
  45 #include <asm/cpu_device_id.h>
  46 #include <asm/iosf_mbi.h>
  47 #endif
  48
  49 #include "sdhci.h"
  50
  51 enum {
  52         SDHCI_ACPI_SD_CD                = BIT(0),
  53         SDHCI_ACPI_RUNTIME_PM           = BIT(1),
  54         SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL = BIT(2),
  55 };
  56
  57 struct sdhci_acpi_chip {
  58         const struct    sdhci_ops *ops;
  59         unsigned int    quirks;
  60         unsigned int    quirks2;
  61         unsigned long   caps;
  62         unsigned int    caps2;
  63         mmc_pm_flag_t   pm_caps;
  64 };
  65
  66 struct sdhci_acpi_slot {
  67         const struct    sdhci_acpi_chip *chip;
  68         unsigned int    quirks;
  69         unsigned int    quirks2;
  70         unsigned long   caps;
  71         unsigned int    caps2;
  72         mmc_pm_flag_t   pm_caps;
  73         unsigned int    flags;
  74         int (*probe_slot)(struct platform_device *, const char *, const char *);
  75         int (*remove_slot)(struct platform_device *);
  76 };
  77
  78 struct sdhci_acpi_host {
  79         struct sdhci_host               *host;
  80         const struct sdhci_acpi_slot    *slot;
  81         struct platform_device          *pdev;
  82         bool                            use_runtime_pm;
  83         bool                            dma_setup;
  84 };
  85
  86 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
  87 {
  88         return c->slot && (c->slot->flags & flag);
  89 }
  90
  91 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
  92 {
  93         struct sdhci_acpi_host *c = sdhci_priv(host);
  94         struct device *dev = &c->pdev->dev;
  95         int err = -1;
  96
  97         if (c->dma_setup)
  98                 return 0;
  99
 100         if (host->flags & SDHCI_USE_64_BIT_DMA) {
 101                 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA) {
 102                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
 103                 } else {
 104                         err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 105                         if (err)
 106                                 dev_warn(dev, "Failed to set 64-bit DMA mask\n");
 107                 }
 108         }
 109
 110         if (err)
 111                 err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 112
 113         c->dma_setup = !err;
 114
 115         return err;
 116 }
 117
 118 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
 119 {
 120         u8 reg;
 121
 122         reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
 123         reg |= 0x10;
 124         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 125         /* For eMMC, minimum is 1us but give it 9us for good measure */
 126         udelay(9);
 127         reg &= ~0x10;
 128         sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
 129         /* For eMMC, minimum is 200us but give it 300us for good measure */
 130         usleep_range(300, 1000);
 131 }
 132
 133 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
 134         .set_clock = sdhci_set_clock,
 135         .enable_dma = sdhci_acpi_enable_dma,
 136         .set_bus_width = sdhci_set_bus_width,
 137         .reset = sdhci_reset,
 138         .set_uhs_signaling = sdhci_set_uhs_signaling,
 139 };
 140
 141 static const struct sdhci_ops sdhci_acpi_ops_int = {
 142         .set_clock = sdhci_set_clock,
 143         .enable_dma = sdhci_acpi_enable_dma,
 144         .set_bus_width = sdhci_set_bus_width,
 145         .reset = sdhci_reset,
 146         .set_uhs_signaling = sdhci_set_uhs_signaling,
 147         .hw_reset   = sdhci_acpi_int_hw_reset,
 148 };
 149
 150 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
 151         .ops = &sdhci_acpi_ops_int,
 152 };
 153
 154 #ifdef CONFIG_X86
 155
 156 static bool sdhci_acpi_byt(void)
 157 {
 158         static const struct x86_cpu_id byt[] = {
 159                 { X86_VENDOR_INTEL, 6, 0x37 },
 160                 {}
 161         };
 162
 163         return x86_match_cpu(byt);
 164 }
 165
 166 #define BYT_IOSF_SCCEP                  0x63
 167 #define BYT_IOSF_OCP_NETCTRL0           0x1078
 168 #define BYT_IOSF_OCP_TIMEOUT_BASE       GENMASK(10, 8)
 169
 170 static void sdhci_acpi_byt_setting(struct device *dev)
 171 {
 172         u32 val = 0;
 173
 174         if (!sdhci_acpi_byt())
 175                 return;
 176
 177         if (iosf_mbi_read(BYT_IOSF_SCCEP, 0x06, BYT_IOSF_OCP_NETCTRL0,
 178                           &val)) {
 179                 dev_err(dev, "%s read error\n", __func__);
 180                 return;
 181         }
 182
 183         if (!(val & BYT_IOSF_OCP_TIMEOUT_BASE))
 184                 return;
 185
 186         val &= ~BYT_IOSF_OCP_TIMEOUT_BASE;
 187
 188         if (iosf_mbi_write(BYT_IOSF_SCCEP, 0x07, BYT_IOSF_OCP_NETCTRL0,
 189                            val)) {
 190                 dev_err(dev, "%s write error\n", __func__);
 191                 return;
 192         }
 193
 194         dev_dbg(dev, "%s completed\n", __func__);
 195 }
 196
 197 static bool sdhci_acpi_byt_defer(struct device *dev)
 198 {
 199         if (!sdhci_acpi_byt())
 200                 return false;
 201
 202         if (!iosf_mbi_available())
 203                 return true;
 204
 205         sdhci_acpi_byt_setting(dev);
 206
 207         return false;
 208 }
 209
 210 #else
 211
 212 static inline void sdhci_acpi_byt_setting(struct device *dev)
 213 {
 214 }
 215
 216 static inline bool sdhci_acpi_byt_defer(struct device *dev)
 217 {
 218         return false;
 219 }
 220
 221 #endif
 222
 223 static int bxt_get_cd(struct mmc_host *mmc)
 224 {
 225         int gpio_cd = mmc_gpio_get_cd(mmc);
 226         struct sdhci_host *host = mmc_priv(mmc);
 227         unsigned long flags;
 228         int ret = 0;
 229
 230         if (!gpio_cd)
 231                 return 0;
 232
 233         pm_runtime_get_sync(mmc->parent);
 234
 235         spin_lock_irqsave(&host->lock, flags);
 236
 237         if (host->flags & SDHCI_DEVICE_DEAD)
 238                 goto out;
 239
 240         ret = !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
 241 out:
 242         spin_unlock_irqrestore(&host->lock, flags);
 243
 244         pm_runtime_mark_last_busy(mmc->parent);
 245         pm_runtime_put_autosuspend(mmc->parent);
 246
 247         return ret;
 248 }
 249
 250 static int sdhci_acpi_emmc_probe_slot(struct platform_device *pdev,
 251                                       const char *hid, const char *uid)
 252 {
 253         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 254         struct sdhci_host *host;
 255
 256         if (!c || !c->host)
 257                 return 0;
 258
 259         host = c->host;
 260
 261         /* Platform specific code during emmc probe slot goes here */
 262
 263         if (hid && uid && !strcmp(hid, "80860F14") && !strcmp(uid, "1") &&
 264             sdhci_readl(host, SDHCI_CAPABILITIES) == 0x446cc8b2 &&
 265             sdhci_readl(host, SDHCI_CAPABILITIES_1) == 0x00000807)
 266                 host->timeout_clk = 1000; /* 1000 kHz i.e. 1 MHz */
 267
 268         return 0;
 269 }
 270
 271 static int sdhci_acpi_sdio_probe_slot(struct platform_device *pdev,
 272                                       const char *hid, const char *uid)
 273 {
 274         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 275         struct sdhci_host *host;
 276
 277         if (!c || !c->host)
 278                 return 0;
 279
 280         host = c->host;
 281
 282         /* Platform specific code during sdio probe slot goes here */
 283
 284         return 0;
 285 }
 286
 287 static int sdhci_acpi_sd_probe_slot(struct platform_device *pdev,
 288                                     const char *hid, const char *uid)
 289 {
 290         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 291         struct sdhci_host *host;
 292
 293         if (!c || !c->host || !c->slot)
 294                 return 0;
 295
 296         host = c->host;
 297
 298         /* Platform specific code during sd probe slot goes here */
 299
 300         if (hid && !strcmp(hid, "80865ACA"))
 301                 host->mmc_host_ops.get_cd = bxt_get_cd;
 302
 303         return 0;
 304 }
 305
 306 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
 307         .chip    = &sdhci_acpi_chip_int,
 308         .caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE |
 309                    MMC_CAP_HW_RESET | MMC_CAP_1_8V_DDR |
 310                    MMC_CAP_WAIT_WHILE_BUSY,
 311         .caps2   = MMC_CAP2_HC_ERASE_SZ,
 312         .flags   = SDHCI_ACPI_RUNTIME_PM,
 313         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 314         .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
 315                    SDHCI_QUIRK2_STOP_WITH_TC |
 316                    SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400,
 317         .probe_slot     = sdhci_acpi_emmc_probe_slot,
 318 };
 319
 320 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
 321         .quirks  = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
 322                    SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 323         .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
 324         .caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD |
 325                    MMC_CAP_WAIT_WHILE_BUSY,
 326         .flags   = SDHCI_ACPI_RUNTIME_PM,
 327         .pm_caps = MMC_PM_KEEP_POWER,
 328         .probe_slot     = sdhci_acpi_sdio_probe_slot,
 329 };
 330
 331 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
 332         .flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
 333                    SDHCI_ACPI_RUNTIME_PM,
 334         .quirks  = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
 335         .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
 336                    SDHCI_QUIRK2_STOP_WITH_TC,
 337         .caps    = MMC_CAP_WAIT_WHILE_BUSY,
 338         .probe_slot     = sdhci_acpi_sd_probe_slot,
 339 };
 340
 341 struct sdhci_acpi_uid_slot {
 342         const char *hid;
 343         const char *uid;
 344         const struct sdhci_acpi_slot *slot;
 345 };
 346
 347 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
 348         { "80865ACA", NULL, &sdhci_acpi_slot_int_sd },
 349         { "80865ACC", NULL, &sdhci_acpi_slot_int_emmc },
 350         { "80865AD0", NULL, &sdhci_acpi_slot_int_sdio },
 351         { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
 352         { "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
 353         { "80860F16" , NULL, &sdhci_acpi_slot_int_sd   },
 354         { "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
 355         { "INT33BB"  , "3" , &sdhci_acpi_slot_int_sd },
 356         { "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
 357         { "INT3436"  , NULL, &sdhci_acpi_slot_int_sdio },
 358         { "INT344D"  , NULL, &sdhci_acpi_slot_int_sdio },
 359         { "PNP0FFF"  , "3" , &sdhci_acpi_slot_int_sd   },
 360         { "PNP0D40"  },
 361         { },
 362 };
 363
 364 static const struct acpi_device_id sdhci_acpi_ids[] = {
 365         { "80865ACA" },
 366         { "80865ACC" },
 367         { "80865AD0" },
 368         { "80860F14" },
 369         { "80860F16" },
 370         { "INT33BB"  },
 371         { "INT33C6"  },
 372         { "INT3436"  },
 373         { "INT344D"  },
 374         { "PNP0D40"  },
 375         { },
 376 };
 377 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
 378
 379 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid,
 380                                                          const char *uid)
 381 {
 382         const struct sdhci_acpi_uid_slot *u;
 383
 384         for (u = sdhci_acpi_uids; u->hid; u++) {
 385                 if (strcmp(u->hid, hid))
 386                         continue;
 387                 if (!u->uid)
 388                         return u->slot;
 389                 if (uid && !strcmp(u->uid, uid))
 390                         return u->slot;
 391         }
 392         return NULL;
 393 }
 394
 395 static int sdhci_acpi_probe(struct platform_device *pdev)
 396 {
 397         struct device *dev = &pdev->dev;
 398         acpi_handle handle = ACPI_HANDLE(dev);
 399         struct acpi_device *device;
 400         struct sdhci_acpi_host *c;
 401         struct sdhci_host *host;
 402         struct resource *iomem;
 403         resource_size_t len;
 404         const char *hid;
 405         const char *uid;
 406         int err;
 407
 408         if (acpi_bus_get_device(handle, &device))
 409                 return -ENODEV;
 410
 411         if (acpi_bus_get_status(device) || !device->status.present)
 412                 return -ENODEV;
 413
 414         if (sdhci_acpi_byt_defer(dev))
 415                 return -EPROBE_DEFER;
 416
 417         hid = acpi_device_hid(device);
 418         uid = device->pnp.unique_id;
 419
 420         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 421         if (!iomem)
 422                 return -ENOMEM;
 423
 424         len = resource_size(iomem);
 425         if (len < 0x100)
 426                 dev_err(dev, "Invalid iomem size!\n");
 427
 428         if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
 429                 return -ENOMEM;
 430
 431         host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
 432         if (IS_ERR(host))
 433                 return PTR_ERR(host);
 434
 435         c = sdhci_priv(host);
 436         c->host = host;
 437         c->slot = sdhci_acpi_get_slot(hid, uid);
 438         c->pdev = pdev;
 439         c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
 440
 441         platform_set_drvdata(pdev, c);
 442
 443         host->hw_name   = "ACPI";
 444         host->ops       = &sdhci_acpi_ops_dflt;
 445         host->irq       = platform_get_irq(pdev, 0);
 446
 447         host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
 448                                             resource_size(iomem));
 449         if (host->ioaddr == NULL) {
 450                 err = -ENOMEM;
 451                 goto err_free;
 452         }
 453
 454         if (c->slot) {
 455                 if (c->slot->probe_slot) {
 456                         err = c->slot->probe_slot(pdev, hid, uid);
 457                         if (err)
 458                                 goto err_free;
 459                 }
 460                 if (c->slot->chip) {
 461                         host->ops            = c->slot->chip->ops;
 462                         host->quirks        |= c->slot->chip->quirks;
 463                         host->quirks2       |= c->slot->chip->quirks2;
 464                         host->mmc->caps     |= c->slot->chip->caps;
 465                         host->mmc->caps2    |= c->slot->chip->caps2;
 466                         host->mmc->pm_caps  |= c->slot->chip->pm_caps;
 467                 }
 468                 host->quirks        |= c->slot->quirks;
 469                 host->quirks2       |= c->slot->quirks2;
 470                 host->mmc->caps     |= c->slot->caps;
 471                 host->mmc->caps2    |= c->slot->caps2;
 472                 host->mmc->pm_caps  |= c->slot->pm_caps;
 473         }
 474
 475         host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 476
 477         if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
 478                 bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
 479
 480                 if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
 481                         dev_warn(dev, "failed to setup card detect gpio\n");
 482                         c->use_runtime_pm = false;
 483                 }
 484         }
 485
 486         err = sdhci_add_host(host);
 487         if (err)
 488                 goto err_free;
 489
 490         if (c->use_runtime_pm) {
 491                 pm_runtime_set_active(dev);
 492                 pm_suspend_ignore_children(dev, 1);
 493                 pm_runtime_set_autosuspend_delay(dev, 50);
 494                 pm_runtime_use_autosuspend(dev);
 495                 pm_runtime_enable(dev);
 496         }
 497
 498         return 0;
 499
 500 err_free:
 501         sdhci_free_host(c->host);
 502         return err;
 503 }
 504
 505 static int sdhci_acpi_remove(struct platform_device *pdev)
 506 {
 507         struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
 508         struct device *dev = &pdev->dev;
 509         int dead;
 510
 511         if (c->use_runtime_pm) {
 512                 pm_runtime_get_sync(dev);
 513                 pm_runtime_disable(dev);
 514                 pm_runtime_put_noidle(dev);
 515         }
 516
 517         if (c->slot && c->slot->remove_slot)
 518                 c->slot->remove_slot(pdev);
 519
 520         dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
 521         sdhci_remove_host(c->host, dead);
 522         sdhci_free_host(c->host);
 523
 524         return 0;
 525 }
 526
 527 #ifdef CONFIG_PM_SLEEP
 528
 529 static int sdhci_acpi_suspend(struct device *dev)
 530 {
 531         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 532
 533         return sdhci_suspend_host(c->host);
 534 }
 535
 536 static int sdhci_acpi_resume(struct device *dev)
 537 {
 538         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 539
 540         sdhci_acpi_byt_setting(&c->pdev->dev);
 541
 542         return sdhci_resume_host(c->host);
 543 }
 544
 545 #else
 546
 547 #define sdhci_acpi_suspend      NULL
 548 #define sdhci_acpi_resume       NULL
 549
 550 #endif
 551
 552 #ifdef CONFIG_PM
 553
 554 static int sdhci_acpi_runtime_suspend(struct device *dev)
 555 {
 556         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 557
 558         return sdhci_runtime_suspend_host(c->host);
 559 }
 560
 561 static int sdhci_acpi_runtime_resume(struct device *dev)
 562 {
 563         struct sdhci_acpi_host *c = dev_get_drvdata(dev);
 564
 565         sdhci_acpi_byt_setting(&c->pdev->dev);
 566
 567         return sdhci_runtime_resume_host(c->host);
 568 }
 569
 570 #endif
 571
 572 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
 573         .suspend                = sdhci_acpi_suspend,
 574         .resume                 = sdhci_acpi_resume,
 575         SET_RUNTIME_PM_OPS(sdhci_acpi_runtime_suspend,
 576                         sdhci_acpi_runtime_resume, NULL)
 577 };
 578
 579 static struct platform_driver sdhci_acpi_driver = {
 580         .driver = {
 581                 .name                   = "sdhci-acpi",
 582                 .acpi_match_table       = sdhci_acpi_ids,
 583                 .pm                     = &sdhci_acpi_pm_ops,
 584         },
 585         .probe  = sdhci_acpi_probe,
 586         .remove = sdhci_acpi_remove,
 587 };
 588
 589 module_platform_driver(sdhci_acpi_driver);
 590
 591 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
 592 MODULE_AUTHOR("Adrian Hunter");
 593 MODULE_LICENSE("GPL v2");