drivers/mmc/host/omap_hsmmc.c

   1 /*
   2  * drivers/mmc/host/omap_hsmmc.c
   3  *
   4  * Driver for OMAP2430/3430 MMC controller.
   5  *
   6  * Copyright (C) 2007 Texas Instruments.
   7  *
   8  * Authors:
   9  *      Syed Mohammed Khasim    <x0khasim@ti.com>
  10  *      Madhusudhan             <madhu.cr@ti.com>
  11  *      Mohit Jalori            <mjalori@ti.com>
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2. This program is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/debugfs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/delay.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/timer.h>
  28 #include <linux/clk.h>
  29 #include <linux/mmc/host.h>
  30 #include <linux/mmc/core.h>
  31 #include <linux/mmc/mmc.h>
  32 #include <linux/io.h>
  33 #include <linux/semaphore.h>
  34 #include <linux/gpio.h>
  35 #include <linux/regulator/consumer.h>
  36 #include <linux/pm_runtime.h>
  37 #include <plat/dma.h>
  38 #include <mach/hardware.h>
  39 #include <plat/board.h>
  40 #include <plat/mmc.h>
  41 #include <plat/cpu.h>
  42
  43 /* OMAP HSMMC Host Controller Registers */
  44 #define OMAP_HSMMC_SYSCONFIG    0x0010
  45 #define OMAP_HSMMC_SYSSTATUS    0x0014
  46 #define OMAP_HSMMC_CON          0x002C
  47 #define OMAP_HSMMC_BLK          0x0104
  48 #define OMAP_HSMMC_ARG          0x0108
  49 #define OMAP_HSMMC_CMD          0x010C
  50 #define OMAP_HSMMC_RSP10        0x0110
  51 #define OMAP_HSMMC_RSP32        0x0114
  52 #define OMAP_HSMMC_RSP54        0x0118
  53 #define OMAP_HSMMC_RSP76        0x011C
  54 #define OMAP_HSMMC_DATA         0x0120
  55 #define OMAP_HSMMC_HCTL         0x0128
  56 #define OMAP_HSMMC_SYSCTL       0x012C
  57 #define OMAP_HSMMC_STAT         0x0130
  58 #define OMAP_HSMMC_IE           0x0134
  59 #define OMAP_HSMMC_ISE          0x0138
  60 #define OMAP_HSMMC_CAPA         0x0140
  61
  62 #define VS18                    (1 << 26)
  63 #define VS30                    (1 << 25)
  64 #define SDVS18                  (0x5 << 9)
  65 #define SDVS30                  (0x6 << 9)
  66 #define SDVS33                  (0x7 << 9)
  67 #define SDVS_MASK               0x00000E00
  68 #define SDVSCLR                 0xFFFFF1FF
  69 #define SDVSDET                 0x00000400
  70 #define AUTOIDLE                0x1
  71 #define SDBP                    (1 << 8)
  72 #define DTO                     0xe
  73 #define ICE                     0x1
  74 #define ICS                     0x2
  75 #define CEN                     (1 << 2)
  76 #define CLKD_MASK               0x0000FFC0
  77 #define CLKD_SHIFT              6
  78 #define DTO_MASK                0x000F0000
  79 #define DTO_SHIFT               16
  80 #define INT_EN_MASK             0x307F0033
  81 #define BWR_ENABLE              (1 << 4)
  82 #define BRR_ENABLE              (1 << 5)
  83 #define DTO_ENABLE              (1 << 20)
  84 #define INIT_STREAM             (1 << 1)
  85 #define DP_SELECT               (1 << 21)
  86 #define DDIR                    (1 << 4)
  87 #define DMA_EN                  0x1
  88 #define MSBS                    (1 << 5)
  89 #define BCE                     (1 << 1)
  90 #define FOUR_BIT                (1 << 1)
  91 #define DW8                     (1 << 5)
  92 #define CC                      0x1
  93 #define TC                      0x02
  94 #define OD                      0x1
  95 #define ERR                     (1 << 15)
  96 #define CMD_TIMEOUT             (1 << 16)
  97 #define DATA_TIMEOUT            (1 << 20)
  98 #define CMD_CRC                 (1 << 17)
  99 #define DATA_CRC                (1 << 21)
 100 #define CARD_ERR                (1 << 28)
 101 #define STAT_CLEAR              0xFFFFFFFF
 102 #define INIT_STREAM_CMD         0x00000000
 103 #define DUAL_VOLT_OCR_BIT       7
 104 #define SRC                     (1 << 25)
 105 #define SRD                     (1 << 26)
 106 #define SOFTRESET               (1 << 1)
 107 #define RESETDONE               (1 << 0)
 108
 109 /*
 110  * FIXME: Most likely all the data using these _DEVID defines should come
 111  * from the platform_data, or implemented in controller and slot specific
 112  * functions.
 113  */
 114 #define OMAP_MMC1_DEVID         0
 115 #define OMAP_MMC2_DEVID         1
 116 #define OMAP_MMC3_DEVID         2
 117 #define OMAP_MMC4_DEVID         3
 118 #define OMAP_MMC5_DEVID         4
 119
 120 #define MMC_AUTOSUSPEND_DELAY   100
 121 #define MMC_TIMEOUT_MS          20
 122 #define OMAP_MMC_MASTER_CLOCK   96000000
 123 #define OMAP_MMC_MIN_CLOCK      400000
 124 #define OMAP_MMC_MAX_CLOCK      52000000
 125 #define DRIVER_NAME             "omap_hsmmc"
 126
 127 /*
 128  * One controller can have multiple slots, like on some omap boards using
 129  * omap.c controller driver. Luckily this is not currently done on any known
 130  * omap_hsmmc.c device.
 131  */
 132 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
 133
 134 /*
 135  * MMC Host controller read/write API's
 136  */
 137 #define OMAP_HSMMC_READ(base, reg)      \
 138         __raw_readl((base) + OMAP_HSMMC_##reg)
 139
 140 #define OMAP_HSMMC_WRITE(base, reg, val) \
 141         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
 142
 143 struct omap_hsmmc_next {
 144         unsigned int    dma_len;
 145         s32             cookie;
 146 };
 147
 148 struct omap_hsmmc_host {
 149         struct  device          *dev;
 150         struct  mmc_host        *mmc;
 151         struct  mmc_request     *mrq;
 152         struct  mmc_command     *cmd;
 153         struct  mmc_data        *data;
 154         struct  clk             *fclk;
 155         struct  clk             *dbclk;
 156         /*
 157          * vcc == configured supply
 158          * vcc_aux == optional
 159          *   -  MMC1, supply for DAT4..DAT7
 160          *   -  MMC2/MMC2, external level shifter voltage supply, for
 161          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
 162          */
 163         struct  regulator       *vcc;
 164         struct  regulator       *vcc_aux;
 165         void    __iomem         *base;
 166         resource_size_t         mapbase;
 167         spinlock_t              irq_lock; /* Prevent races with irq handler */
 168         unsigned int            id;
 169         unsigned int            dma_len;
 170         unsigned int            dma_sg_idx;
 171         unsigned char           bus_mode;
 172         unsigned char           power_mode;
 173         u32                     *buffer;
 174         u32                     bytesleft;
 175         int                     suspended;
 176         int                     irq;
 177         int                     use_dma, dma_ch;
 178         int                     dma_line_tx, dma_line_rx;
 179         int                     slot_id;
 180         int                     got_dbclk;
 181         int                     response_busy;
 182         int                     context_loss;
 183         int                     dpm_state;
 184         int                     vdd;
 185         int                     protect_card;
 186         int                     reqs_blocked;
 187         int                     use_reg;
 188         int                     req_in_progress;
 189         struct omap_hsmmc_next  next_data;
 190
 191         struct  omap_mmc_platform_data  *pdata;
 192 };
 193
 194 static int omap_hsmmc_card_detect(struct device *dev, int slot)
 195 {
 196         struct omap_mmc_platform_data *mmc = dev->platform_data;
 197
 198         /* NOTE: assumes card detect signal is active-low */
 199         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 200 }
 201
 202 static int omap_hsmmc_get_wp(struct device *dev, int slot)
 203 {
 204         struct omap_mmc_platform_data *mmc = dev->platform_data;
 205
 206         /* NOTE: assumes write protect signal is active-high */
 207         return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
 208 }
 209
 210 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
 211 {
 212         struct omap_mmc_platform_data *mmc = dev->platform_data;
 213
 214         /* NOTE: assumes card detect signal is active-low */
 215         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 216 }
 217
 218 #ifdef CONFIG_PM
 219
 220 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
 221 {
 222         struct omap_mmc_platform_data *mmc = dev->platform_data;
 223
 224         disable_irq(mmc->slots[0].card_detect_irq);
 225         return 0;
 226 }
 227
 228 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
 229 {
 230         struct omap_mmc_platform_data *mmc = dev->platform_data;
 231
 232         enable_irq(mmc->slots[0].card_detect_irq);
 233         return 0;
 234 }
 235
 236 #else
 237
 238 #define omap_hsmmc_suspend_cdirq        NULL
 239 #define omap_hsmmc_resume_cdirq         NULL
 240
 241 #endif
 242
 243 #ifdef CONFIG_REGULATOR
 244
 245 static int omap_hsmmc_1_set_power(struct device *dev, int slot, int power_on,
 246                                   int vdd)
 247 {
 248         struct omap_hsmmc_host *host =
 249                 platform_get_drvdata(to_platform_device(dev));
 250         int ret;
 251
 252         if (mmc_slot(host).before_set_reg)
 253                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
 254
 255         if (power_on)
 256                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 257         else
 258                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
 259
 260         if (mmc_slot(host).after_set_reg)
 261                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
 262
 263         return ret;
 264 }
 265
 266 static int omap_hsmmc_235_set_power(struct device *dev, int slot, int power_on,
 267                                    int vdd)
 268 {
 269         struct omap_hsmmc_host *host =
 270                 platform_get_drvdata(to_platform_device(dev));
 271         int ret = 0;
 272
 273         /*
 274          * If we don't see a Vcc regulator, assume it's a fixed
 275          * voltage always-on regulator.
 276          */
 277         if (!host->vcc)
 278                 return 0;
 279
 280         if (mmc_slot(host).before_set_reg)
 281                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
 282
 283         /*
 284          * Assume Vcc regulator is used only to power the card ... OMAP
 285          * VDDS is used to power the pins, optionally with a transceiver to
 286          * support cards using voltages other than VDDS (1.8V nominal).  When a
 287          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 288          *
 289          * In some cases this regulator won't support enable/disable;
 290          * e.g. it's a fixed rail for a WLAN chip.
 291          *
 292          * In other cases vcc_aux switches interface power.  Example, for
 293          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 294          * chips/cards need an interface voltage rail too.
 295          */
 296         if (power_on) {
 297                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 298                 /* Enable interface voltage rail, if needed */
 299                 if (ret == 0 && host->vcc_aux) {
 300                         ret = regulator_enable(host->vcc_aux);
 301                         if (ret < 0)
 302                                 ret = mmc_regulator_set_ocr(host->mmc,
 303                                                         host->vcc, 0);
 304                 }
 305         } else {
 306                 /* Shut down the rail */
 307                 if (host->vcc_aux)
 308                         ret = regulator_disable(host->vcc_aux);
 309                 if (!ret) {
 310                         /* Then proceed to shut down the local regulator */
 311                         ret = mmc_regulator_set_ocr(host->mmc,
 312                                                 host->vcc, 0);
 313                 }
 314         }
 315
 316         if (mmc_slot(host).after_set_reg)
 317                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
 318
 319         return ret;
 320 }
 321
 322 static int omap_hsmmc_4_set_power(struct device *dev, int slot, int power_on,
 323                                         int vdd)
 324 {
 325         return 0;
 326 }
 327
 328 static int omap_hsmmc_1_set_sleep(struct device *dev, int slot, int sleep,
 329                                   int vdd, int cardsleep)
 330 {
 331         struct omap_hsmmc_host *host =
 332                 platform_get_drvdata(to_platform_device(dev));
 333         int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
 334
 335         return regulator_set_mode(host->vcc, mode);
 336 }
 337
 338 static int omap_hsmmc_235_set_sleep(struct device *dev, int slot, int sleep,
 339                                    int vdd, int cardsleep)
 340 {
 341         struct omap_hsmmc_host *host =
 342                 platform_get_drvdata(to_platform_device(dev));
 343         int err, mode;
 344
 345         /*
 346          * If we don't see a Vcc regulator, assume it's a fixed
 347          * voltage always-on regulator.
 348          */
 349         if (!host->vcc)
 350                 return 0;
 351
 352         mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
 353
 354         if (!host->vcc_aux)
 355                 return regulator_set_mode(host->vcc, mode);
 356
 357         if (cardsleep) {
 358                 /* VCC can be turned off if card is asleep */
 359                 if (sleep)
 360                         err = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
 361                 else
 362                         err = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 363         } else
 364                 err = regulator_set_mode(host->vcc, mode);
 365         if (err)
 366                 return err;
 367
 368         if (!mmc_slot(host).vcc_aux_disable_is_sleep)
 369                 return regulator_set_mode(host->vcc_aux, mode);
 370
 371         if (sleep)
 372                 return regulator_disable(host->vcc_aux);
 373         else
 374                 return regulator_enable(host->vcc_aux);
 375 }
 376
 377 static int omap_hsmmc_4_set_sleep(struct device *dev, int slot, int sleep,
 378                                         int vdd, int cardsleep)
 379 {
 380         return 0;
 381 }
 382
 383 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 384 {
 385         struct regulator *reg;
 386         int ret = 0;
 387         int ocr_value = 0;
 388
 389         switch (host->id) {
 390         case OMAP_MMC1_DEVID:
 391                 /* On-chip level shifting via PBIAS0/PBIAS1 */
 392                 mmc_slot(host).set_power = omap_hsmmc_1_set_power;
 393                 mmc_slot(host).set_sleep = omap_hsmmc_1_set_sleep;
 394                 break;
 395         case OMAP_MMC2_DEVID:
 396         case OMAP_MMC3_DEVID:
 397         case OMAP_MMC5_DEVID:
 398                 /* Off-chip level shifting, or none */
 399                 mmc_slot(host).set_power = omap_hsmmc_235_set_power;
 400                 mmc_slot(host).set_sleep = omap_hsmmc_235_set_sleep;
 401                 break;
 402         case OMAP_MMC4_DEVID:
 403                 mmc_slot(host).set_power = omap_hsmmc_4_set_power;
 404                 mmc_slot(host).set_sleep = omap_hsmmc_4_set_sleep;
 405         default:
 406                 pr_err("MMC%d configuration not supported!\n", host->id);
 407                 return -EINVAL;
 408         }
 409
 410         reg = regulator_get(host->dev, "vmmc");
 411         if (IS_ERR(reg)) {
 412                 dev_dbg(host->dev, "vmmc regulator missing\n");
 413                 /*
 414                 * HACK: until fixed.c regulator is usable,
 415                 * we don't require a main regulator
 416                 * for MMC2 or MMC3
 417                 */
 418                 if (host->id == OMAP_MMC1_DEVID) {
 419                         ret = PTR_ERR(reg);
 420                         goto err;
 421                 }
 422         } else {
 423                 host->vcc = reg;
 424                 ocr_value = mmc_regulator_get_ocrmask(reg);
 425                 if (!mmc_slot(host).ocr_mask) {
 426                         mmc_slot(host).ocr_mask = ocr_value;
 427                 } else {
 428                         if (!(mmc_slot(host).ocr_mask & ocr_value)) {
 429                                 pr_err("MMC%d ocrmask %x is not supported\n",
 430                                         host->id, mmc_slot(host).ocr_mask);
 431                                 mmc_slot(host).ocr_mask = 0;
 432                                 return -EINVAL;
 433                         }
 434                 }
 435
 436                 /* Allow an aux regulator */
 437                 reg = regulator_get(host->dev, "vmmc_aux");
 438                 host->vcc_aux = IS_ERR(reg) ? NULL : reg;
 439
 440                 /* For eMMC do not power off when not in sleep state */
 441                 if (mmc_slot(host).no_regulator_off_init)
 442                         return 0;
 443                 /*
 444                 * UGLY HACK:  workaround regulator framework bugs.
 445                 * When the bootloader leaves a supply active, it's
 446                 * initialized with zero usecount ... and we can't
 447                 * disable it without first enabling it.  Until the
 448                 * framework is fixed, we need a workaround like this
 449                 * (which is safe for MMC, but not in general).
 450                 */
 451                 if (regulator_is_enabled(host->vcc) > 0 ||
 452                     (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
 453                         int vdd = ffs(mmc_slot(host).ocr_mask) - 1;
 454
 455                         mmc_slot(host).set_power(host->dev, host->slot_id,
 456                                                  1, vdd);
 457                         mmc_slot(host).set_power(host->dev, host->slot_id,
 458                                                  0, 0);
 459                 }
 460         }
 461
 462         return 0;
 463
 464 err:
 465         mmc_slot(host).set_power = NULL;
 466         mmc_slot(host).set_sleep = NULL;
 467         return ret;
 468 }
 469
 470 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 471 {
 472         regulator_put(host->vcc);
 473         regulator_put(host->vcc_aux);
 474         mmc_slot(host).set_power = NULL;
 475         mmc_slot(host).set_sleep = NULL;
 476 }
 477
 478 static inline int omap_hsmmc_have_reg(void)
 479 {
 480         return 1;
 481 }
 482
 483 #else
 484
 485 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 486 {
 487         return -EINVAL;
 488 }
 489
 490 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 491 {
 492 }
 493
 494 static inline int omap_hsmmc_have_reg(void)
 495 {
 496         return 0;
 497 }
 498
 499 #endif
 500
 501 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
 502 {
 503         int ret;
 504
 505         if (gpio_is_valid(pdata->slots[0].switch_pin)) {
 506                 if (pdata->slots[0].cover)
 507                         pdata->slots[0].get_cover_state =
 508                                         omap_hsmmc_get_cover_state;
 509                 else
 510                         pdata->slots[0].card_detect = omap_hsmmc_card_detect;
 511                 pdata->slots[0].card_detect_irq =
 512                                 gpio_to_irq(pdata->slots[0].switch_pin);
 513                 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
 514                 if (ret)
 515                         return ret;
 516                 ret = gpio_direction_input(pdata->slots[0].switch_pin);
 517                 if (ret)
 518                         goto err_free_sp;
 519         } else
 520                 pdata->slots[0].switch_pin = -EINVAL;
 521
 522         if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
 523                 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
 524                 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
 525                 if (ret)
 526                         goto err_free_cd;
 527                 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
 528                 if (ret)
 529                         goto err_free_wp;
 530         } else
 531                 pdata->slots[0].gpio_wp = -EINVAL;
 532
 533         return 0;
 534
 535 err_free_wp:
 536         gpio_free(pdata->slots[0].gpio_wp);
 537 err_free_cd:
 538         if (gpio_is_valid(pdata->slots[0].switch_pin))
 539 err_free_sp:
 540                 gpio_free(pdata->slots[0].switch_pin);
 541         return ret;
 542 }
 543
 544 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
 545 {
 546         if (gpio_is_valid(pdata->slots[0].gpio_wp))
 547                 gpio_free(pdata->slots[0].gpio_wp);
 548         if (gpio_is_valid(pdata->slots[0].switch_pin))
 549                 gpio_free(pdata->slots[0].switch_pin);
 550 }
 551
 552 /*
 553  * Start clock to the card
 554  */
 555 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
 556 {
 557         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 558                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 559 }
 560
 561 /*
 562  * Stop clock to the card
 563  */
 564 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
 565 {
 566         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 567                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 568         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 569                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
 570 }
 571
 572 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
 573                                   struct mmc_command *cmd)
 574 {
 575         unsigned int irq_mask;
 576
 577         if (host->use_dma)
 578                 irq_mask = INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE);
 579         else
 580                 irq_mask = INT_EN_MASK;
 581
 582         /* Disable timeout for erases */
 583         if (cmd->opcode == MMC_ERASE)
 584                 irq_mask &= ~DTO_ENABLE;
 585
 586         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 587         OMAP_HSMMC_WRITE(host->base, ISE, host->use_dma ? irq_mask : 0);
 588         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 589 }
 590
 591 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
 592 {
 593         OMAP_HSMMC_WRITE(host->base, ISE, 0);
 594         OMAP_HSMMC_WRITE(host->base, IE, 0);
 595         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 596 }
 597
 598 /* Calculate divisor for the given clock frequency */
 599 static u16 calc_divisor(struct mmc_ios *ios)
 600 {
 601         u16 dsor = 0;
 602
 603         if (ios->clock) {
 604                 dsor = DIV_ROUND_UP(OMAP_MMC_MASTER_CLOCK, ios->clock);
 605                 if (dsor > 250)
 606                         dsor = 250;
 607         }
 608
 609         return dsor;
 610 }
 611
 612 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
 613 {
 614         struct mmc_ios *ios = &host->mmc->ios;
 615         unsigned long regval;
 616         unsigned long timeout;
 617
 618         dev_dbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
 619
 620         omap_hsmmc_stop_clock(host);
 621
 622         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 623         regval = regval & ~(CLKD_MASK | DTO_MASK);
 624         regval = regval | (calc_divisor(ios) << 6) | (DTO << 16);
 625         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 626         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 627                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 628
 629         /* Wait till the ICS bit is set */
 630         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 631         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
 632                 && time_before(jiffies, timeout))
 633                 cpu_relax();
 634
 635         omap_hsmmc_start_clock(host);
 636 }
 637
 638 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
 639 {
 640         struct mmc_ios *ios = &host->mmc->ios;
 641         u32 con;
 642
 643         con = OMAP_HSMMC_READ(host->base, CON);
 644         switch (ios->bus_width) {
 645         case MMC_BUS_WIDTH_8:
 646                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
 647                 break;
 648         case MMC_BUS_WIDTH_4:
 649                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 650                 OMAP_HSMMC_WRITE(host->base, HCTL,
 651                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 652                 break;
 653         case MMC_BUS_WIDTH_1:
 654                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 655                 OMAP_HSMMC_WRITE(host->base, HCTL,
 656                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 657                 break;
 658         }
 659 }
 660
 661 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
 662 {
 663         struct mmc_ios *ios = &host->mmc->ios;
 664         u32 con;
 665
 666         con = OMAP_HSMMC_READ(host->base, CON);
 667         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 668                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
 669         else
 670                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
 671 }
 672
 673 #ifdef CONFIG_PM
 674
 675 /*
 676  * Restore the MMC host context, if it was lost as result of a
 677  * power state change.
 678  */
 679 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 680 {
 681         struct mmc_ios *ios = &host->mmc->ios;
 682         struct omap_mmc_platform_data *pdata = host->pdata;
 683         int context_loss = 0;
 684         u32 hctl, capa;
 685         unsigned long timeout;
 686
 687         if (pdata->get_context_loss_count) {
 688                 context_loss = pdata->get_context_loss_count(host->dev);
 689                 if (context_loss < 0)
 690                         return 1;
 691         }
 692
 693         dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
 694                 context_loss == host->context_loss ? "not " : "");
 695         if (host->context_loss == context_loss)
 696                 return 1;
 697
 698         /* Wait for hardware reset */
 699         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 700         while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
 701                 && time_before(jiffies, timeout))
 702                 ;
 703
 704         /* Do software reset */
 705         OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET);
 706         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 707         while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
 708                 && time_before(jiffies, timeout))
 709                 ;
 710
 711         OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
 712                         OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
 713
 714         if (host->id == OMAP_MMC1_DEVID) {
 715                 if (host->power_mode != MMC_POWER_OFF &&
 716                     (1 << ios->vdd) <= MMC_VDD_23_24)
 717                         hctl = SDVS18;
 718                 else
 719                         hctl = SDVS30;
 720                 capa = VS30 | VS18;
 721         } else {
 722                 hctl = SDVS18;
 723                 capa = VS18;
 724         }
 725
 726         OMAP_HSMMC_WRITE(host->base, HCTL,
 727                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
 728
 729         OMAP_HSMMC_WRITE(host->base, CAPA,
 730                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
 731
 732         OMAP_HSMMC_WRITE(host->base, HCTL,
 733                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 734
 735         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 736         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
 737                 && time_before(jiffies, timeout))
 738                 ;
 739
 740         omap_hsmmc_disable_irq(host);
 741
 742         /* Do not initialize card-specific things if the power is off */
 743         if (host->power_mode == MMC_POWER_OFF)
 744                 goto out;
 745
 746         omap_hsmmc_set_bus_width(host);
 747
 748         omap_hsmmc_set_clock(host);
 749
 750         omap_hsmmc_set_bus_mode(host);
 751
 752 out:
 753         host->context_loss = context_loss;
 754
 755         dev_dbg(mmc_dev(host->mmc), "context is restored\n");
 756         return 0;
 757 }
 758
 759 /*
 760  * Save the MMC host context (store the number of power state changes so far).
 761  */
 762 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 763 {
 764         struct omap_mmc_platform_data *pdata = host->pdata;
 765         int context_loss;
 766
 767         if (pdata->get_context_loss_count) {
 768                 context_loss = pdata->get_context_loss_count(host->dev);
 769                 if (context_loss < 0)
 770                         return;
 771                 host->context_loss = context_loss;
 772         }
 773 }
 774
 775 #else
 776
 777 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 778 {
 779         return 0;
 780 }
 781
 782 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 783 {
 784 }
 785
 786 #endif
 787
 788 /*
 789  * Send init stream sequence to card
 790  * before sending IDLE command
 791  */
 792 static void send_init_stream(struct omap_hsmmc_host *host)
 793 {
 794         int reg = 0;
 795         unsigned long timeout;
 796
 797         if (host->protect_card)
 798                 return;
 799
 800         disable_irq(host->irq);
 801
 802         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 803         OMAP_HSMMC_WRITE(host->base, CON,
 804                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 805         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 806
 807         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 808         while ((reg != CC) && time_before(jiffies, timeout))
 809                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
 810
 811         OMAP_HSMMC_WRITE(host->base, CON,
 812                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 813
 814         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 815         OMAP_HSMMC_READ(host->base, STAT);
 816
 817         enable_irq(host->irq);
 818 }
 819
 820 static inline
 821 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
 822 {
 823         int r = 1;
 824
 825         if (mmc_slot(host).get_cover_state)
 826                 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
 827         return r;
 828 }
 829
 830 static ssize_t
 831 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
 832                            char *buf)
 833 {
 834         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 835         struct omap_hsmmc_host *host = mmc_priv(mmc);
 836
 837         return sprintf(buf, "%s\n",
 838                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
 839 }
 840
 841 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
 842
 843 static ssize_t
 844 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
 845                         char *buf)
 846 {
 847         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 848         struct omap_hsmmc_host *host = mmc_priv(mmc);
 849
 850         return sprintf(buf, "%s\n", mmc_slot(host).name);
 851 }
 852
 853 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
 854
 855 /* for hosts with 35xx erratum 2.1.1.128 */
 856 static ssize_t
 857 omap_hsmmc_show_unsafe_read(struct device *dev, struct device_attribute *attr,
 858                         char *buf)
 859 {
 860         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 861         int val = 0;
 862
 863         if (!(mmc->caps2 & MMC_CAP2_NO_MULTI_READ)) {
 864                 val = 1;
 865                 if (mmc->f_max == OMAP_MMC_MAX_CLOCK)
 866                         val = 2;
 867         }
 868
 869         return sprintf(buf, "%d\n", val);
 870 }
 871
 872 static ssize_t
 873 omap_hsmmc_set_unsafe_read(struct device *dev, struct device_attribute *attr,
 874                 const char *buf, size_t count)
 875 {
 876         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 877         unsigned long val;
 878         int ret;
 879
 880         ret = strict_strtoul(buf, 0, &val);
 881         if (ret)
 882                 return -EINVAL;
 883
 884         switch (val) {
 885         case 0:
 886                 mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
 887                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
 888                 break;
 889         case 1:
 890                 mmc->caps2 &= ~MMC_CAP2_NO_MULTI_READ;
 891                 mmc->f_max = 32000000;
 892                 break;
 893         case 2:
 894                 mmc->caps2 &= ~MMC_CAP2_NO_MULTI_READ;
 895                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
 896                 break;
 897         }
 898
 899         return count;
 900 }
 901 static DEVICE_ATTR(unsafe_read, S_IWUSR | S_IRUGO,
 902         omap_hsmmc_show_unsafe_read, omap_hsmmc_set_unsafe_read);
 903
 904 /*
 905  * Configure the response type and send the cmd.
 906  */
 907 static void
 908 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
 909         struct mmc_data *data)
 910 {
 911         int cmdreg = 0, resptype = 0, cmdtype = 0;
 912
 913         dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 914                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 915         host->cmd = cmd;
 916
 917         omap_hsmmc_enable_irq(host, cmd);
 918
 919         host->response_busy = 0;
 920         if (cmd->flags & MMC_RSP_PRESENT) {
 921                 if (cmd->flags & MMC_RSP_136)
 922                         resptype = 1;
 923                 else if (cmd->flags & MMC_RSP_BUSY) {
 924                         resptype = 3;
 925                         host->response_busy = 1;
 926                 } else
 927                         resptype = 2;
 928         }
 929
 930         /*
 931          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 932          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 933          * a val of 0x3, rest 0x0.
 934          */
 935         if (cmd == host->mrq->stop)
 936                 cmdtype = 0x3;
 937
 938         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 939
 940         if (data) {
 941                 cmdreg |= DP_SELECT | MSBS | BCE;
 942                 if (data->flags & MMC_DATA_READ)
 943                         cmdreg |= DDIR;
 944                 else
 945                         cmdreg &= ~(DDIR);
 946         }
 947
 948         if (host->use_dma)
 949                 cmdreg |= DMA_EN;
 950
 951         host->req_in_progress = 1;
 952
 953         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 954         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 955 }
 956
 957 static int
 958 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
 959 {
 960         if (data->flags & MMC_DATA_WRITE)
 961                 return DMA_TO_DEVICE;
 962         else
 963                 return DMA_FROM_DEVICE;
 964 }
 965
 966 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
 967 {
 968         int dma_ch;
 969
 970         spin_lock(&host->irq_lock);
 971         host->req_in_progress = 0;
 972         dma_ch = host->dma_ch;
 973         spin_unlock(&host->irq_lock);
 974
 975         omap_hsmmc_disable_irq(host);
 976         /* Do not complete the request if DMA is still in progress */
 977         if (mrq->data && host->use_dma && dma_ch != -1)
 978                 return;
 979         host->mrq = NULL;
 980         mmc_request_done(host->mmc, mrq);
 981 }
 982
 983 /*
 984  * Notify the transfer complete to MMC core
 985  */
 986 static void
 987 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
 988 {
 989         if (!data) {
 990                 struct mmc_request *mrq = host->mrq;
 991
 992                 /* TC before CC from CMD6 - don't know why, but it happens */
 993                 if (host->cmd && host->cmd->opcode == 6 &&
 994                     host->response_busy) {
 995                         host->response_busy = 0;
 996                         return;
 997                 }
 998
 999                 omap_hsmmc_request_done(host, mrq);
1000                 return;
1001         }
1002
1003         host->data = NULL;
1004
1005         if (!data->error)
1006                 data->bytes_xfered += data->blocks * (data->blksz);
1007         else
1008                 data->bytes_xfered = 0;
1009
1010         if (!data->stop) {
1011                 omap_hsmmc_request_done(host, data->mrq);
1012                 return;
1013         }
1014         omap_hsmmc_start_command(host, data->stop, NULL);
1015 }
1016
1017 /*
1018  * Notify the core about command completion
1019  */
1020 static void
1021 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
1022 {
1023         host->cmd = NULL;
1024
1025         if (cmd->flags & MMC_RSP_PRESENT) {
1026                 if (cmd->flags & MMC_RSP_136) {
1027                         /* response type 2 */
1028                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
1029                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
1030                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
1031                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
1032                 } else {
1033                         /* response types 1, 1b, 3, 4, 5, 6 */
1034                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
1035                 }
1036         }
1037         if ((host->data == NULL && !host->response_busy) || cmd->error)
1038                 omap_hsmmc_request_done(host, cmd->mrq);
1039 }
1040
1041 /*
1042  * DMA clean up for command errors
1043  */
1044 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
1045 {
1046         int dma_ch;
1047
1048         host->data->error = errno;
1049
1050         spin_lock(&host->irq_lock);
1051         dma_ch = host->dma_ch;
1052         host->dma_ch = -1;
1053         spin_unlock(&host->irq_lock);
1054
1055         if (host->use_dma && dma_ch != -1) {
1056                 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg,
1057                         host->data->sg_len,
1058                         omap_hsmmc_get_dma_dir(host, host->data));
1059                 omap_free_dma(dma_ch);
1060                 host->data->host_cookie = 0;
1061         }
1062         host->data = NULL;
1063 }
1064
1065 /*
1066  * Readable error output
1067  */
1068 #ifdef CONFIG_MMC_DEBUG
1069 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
1070 {
1071         /* --- means reserved bit without definition at documentation */
1072         static const char *omap_hsmmc_status_bits[] = {
1073                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
1074                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
1075                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
1076                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
1077         };
1078         char res[256];
1079         char *buf = res;
1080         int len, i;
1081
1082         len = sprintf(buf, "MMC IRQ 0x%x :", status);
1083         buf += len;
1084
1085         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
1086                 if (status & (1 << i)) {
1087                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
1088                         buf += len;
1089                 }
1090
1091         dev_dbg(mmc_dev(host->mmc), "%s\n", res);
1092 }
1093 #else
1094 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
1095                                              u32 status)
1096 {
1097 }
1098 #endif  /* CONFIG_MMC_DEBUG */
1099
1100 /*
1101  * MMC controller internal state machines reset
1102  *
1103  * Used to reset command or data internal state machines, using respectively
1104  *  SRC or SRD bit of SYSCTL register
1105  * Can be called from interrupt context
1106  */
1107 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1108                                                    unsigned long bit)
1109 {
1110         unsigned long i = 0;
1111         unsigned long limit = (loops_per_jiffy *
1112                                 msecs_to_jiffies(MMC_TIMEOUT_MS));
1113
1114         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1115                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1116
1117         /*
1118          * OMAP4 ES2 and greater has an updated reset logic.
1119          * Monitor a 0->1 transition first
1120          */
1121         if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
1122                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1123                                         && (i++ < limit))
1124                         cpu_relax();
1125         }
1126         i = 0;
1127
1128         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1129                 (i++ < limit))
1130                 cpu_relax();
1131
1132         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1133                 dev_err(mmc_dev(host->mmc),
1134                         "Timeout waiting on controller reset in %s\n",
1135                         __func__);
1136 }
1137
1138 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1139 {
1140         struct mmc_data *data;
1141         int end_cmd = 0, end_trans = 0;
1142
1143         if (!host->req_in_progress) {
1144                 do {
1145                         OMAP_HSMMC_WRITE(host->base, STAT, status);
1146                         /* Flush posted write */
1147                         status = OMAP_HSMMC_READ(host->base, STAT);
1148                 } while (status & INT_EN_MASK);
1149                 return;
1150         }
1151
1152         data = host->data;
1153         dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1154
1155         if (status & ERR) {
1156                 omap_hsmmc_dbg_report_irq(host, status);
1157                 if ((status & CMD_TIMEOUT) ||
1158                         (status & CMD_CRC)) {
1159                         if (host->cmd) {
1160                                 if (status & CMD_TIMEOUT) {
1161                                         omap_hsmmc_reset_controller_fsm(host,
1162                                                                         SRC);
1163                                         host->cmd->error = -ETIMEDOUT;
1164                                 } else {
1165                                         host->cmd->error = -EILSEQ;
1166                                 }
1167                                 end_cmd = 1;
1168                         }
1169                         if (host->data || host->response_busy) {
1170                                 if (host->data)
1171                                         omap_hsmmc_dma_cleanup(host,
1172                                                                 -ETIMEDOUT);
1173                                 host->response_busy = 0;
1174                                 omap_hsmmc_reset_controller_fsm(host, SRD);
1175                         }
1176                 }
1177                 if ((status & DATA_TIMEOUT) ||
1178                         (status & DATA_CRC)) {
1179                         if (host->data || host->response_busy) {
1180                                 int err = (status & DATA_TIMEOUT) ?
1181                                                 -ETIMEDOUT : -EILSEQ;
1182
1183                                 if (host->data)
1184                                         omap_hsmmc_dma_cleanup(host, err);
1185                                 else
1186                                         host->mrq->cmd->error = err;
1187                                 host->response_busy = 0;
1188                                 omap_hsmmc_reset_controller_fsm(host, SRD);
1189                                 end_trans = 1;
1190                         }
1191                 }
1192                 if (status & CARD_ERR) {
1193                         dev_dbg(mmc_dev(host->mmc),
1194                                 "Ignoring card err CMD%d\n", host->cmd->opcode);
1195                         if (host->cmd)
1196                                 end_cmd = 1;
1197                         if (host->data)
1198                                 end_trans = 1;
1199                 }
1200         }
1201
1202         OMAP_HSMMC_WRITE(host->base, STAT, status);
1203
1204         if (end_cmd || ((status & CC) && host->cmd))
1205                 omap_hsmmc_cmd_done(host, host->cmd);
1206         if ((end_trans || (status & TC)) && host->mrq)
1207                 omap_hsmmc_xfer_done(host, data);
1208 }
1209
1210 /*
1211  * MMC controller IRQ handler
1212  */
1213 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1214 {
1215         struct omap_hsmmc_host *host = dev_id;
1216         int status;
1217
1218         status = OMAP_HSMMC_READ(host->base, STAT);
1219         do {
1220                 omap_hsmmc_do_irq(host, status);
1221                 /* Flush posted write */
1222                 status = OMAP_HSMMC_READ(host->base, STAT);
1223         } while (status & INT_EN_MASK);
1224
1225         return IRQ_HANDLED;
1226 }
1227
1228 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1229 {
1230         unsigned long i;
1231
1232         OMAP_HSMMC_WRITE(host->base, HCTL,
1233                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1234         for (i = 0; i < loops_per_jiffy; i++) {
1235                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1236                         break;
1237                 cpu_relax();
1238         }
1239 }
1240
1241 /*
1242  * Switch MMC interface voltage ... only relevant for MMC1.
1243  *
1244  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1245  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1246  * Some chips, like eMMC ones, use internal transceivers.
1247  */
1248 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1249 {
1250         u32 reg_val = 0;
1251         int ret;
1252
1253         /* Disable the clocks */
1254         pm_runtime_put_sync(host->dev);
1255         if (host->got_dbclk)
1256                 clk_disable(host->dbclk);
1257
1258         /* Turn the power off */
1259         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1260
1261         /* Turn the power ON with given VDD 1.8 or 3.0v */
1262         if (!ret)
1263                 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1264                                                vdd);
1265         pm_runtime_get_sync(host->dev);
1266         if (host->got_dbclk)
1267                 clk_enable(host->dbclk);
1268
1269         if (ret != 0)
1270                 goto err;
1271
1272         OMAP_HSMMC_WRITE(host->base, HCTL,
1273                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1274         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1275
1276         /*
1277          * If a MMC dual voltage card is detected, the set_ios fn calls
1278          * this fn with VDD bit set for 1.8V. Upon card removal from the
1279          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1280          *
1281          * Cope with a bit of slop in the range ... per data sheets:
1282          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1283          *    but recommended values are 1.71V to 1.89V
1284          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1285          *    but recommended values are 2.7V to 3.3V
1286          *
1287          * Board setup code shouldn't permit anything very out-of-range.
1288          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1289          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1290          */
1291         if ((1 << vdd) <= MMC_VDD_23_24)
1292                 reg_val |= SDVS18;
1293         else
1294                 reg_val |= SDVS30;
1295
1296         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1297         set_sd_bus_power(host);
1298
1299         return 0;
1300 err:
1301         dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1302         return ret;
1303 }
1304
1305 /* Protect the card while the cover is open */
1306 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1307 {
1308         if (!mmc_slot(host).get_cover_state)
1309                 return;
1310
1311         host->reqs_blocked = 0;
1312         if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1313                 if (host->protect_card) {
1314                         pr_info("%s: cover is closed, "
1315                                          "card is now accessible\n",
1316                                          mmc_hostname(host->mmc));
1317                         host->protect_card = 0;
1318                 }
1319         } else {
1320                 if (!host->protect_card) {
1321                         pr_info("%s: cover is open, "
1322                                          "card is now inaccessible\n",
1323                                          mmc_hostname(host->mmc));
1324                         host->protect_card = 1;
1325                 }
1326         }
1327 }
1328
1329 /*
1330  * irq handler to notify the core about card insertion/removal
1331  */
1332 static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id)
1333 {
1334         struct omap_hsmmc_host *host = dev_id;
1335         struct omap_mmc_slot_data *slot = &mmc_slot(host);
1336         int carddetect;
1337
1338         if (host->suspended)
1339                 return IRQ_HANDLED;
1340
1341         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1342
1343         if (slot->card_detect)
1344                 carddetect = slot->card_detect(host->dev, host->slot_id);
1345         else {
1346                 omap_hsmmc_protect_card(host);
1347                 carddetect = -ENOSYS;
1348         }
1349
1350         if (carddetect)
1351                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1352         else
1353                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1354         return IRQ_HANDLED;
1355 }
1356
1357 static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
1358                                      struct mmc_data *data)
1359 {
1360         int sync_dev;
1361
1362         if (data->flags & MMC_DATA_WRITE)
1363                 sync_dev = host->dma_line_tx;
1364         else
1365                 sync_dev = host->dma_line_rx;
1366         return sync_dev;
1367 }
1368
1369 static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
1370                                        struct mmc_data *data,
1371                                        struct scatterlist *sgl)
1372 {
1373         int blksz, nblk, dma_ch;
1374
1375         dma_ch = host->dma_ch;
1376         if (data->flags & MMC_DATA_WRITE) {
1377                 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1378                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1379                 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1380                         sg_dma_address(sgl), 0, 0);
1381         } else {
1382                 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1383                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1384                 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1385                         sg_dma_address(sgl), 0, 0);
1386         }
1387
1388         blksz = host->data->blksz;
1389         nblk = sg_dma_len(sgl) / blksz;
1390
1391         omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
1392                         blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
1393                         omap_hsmmc_get_dma_sync_dev(host, data),
1394                         !(data->flags & MMC_DATA_WRITE));
1395
1396         omap_start_dma(dma_ch);
1397 }
1398
1399 /*
1400  * DMA call back function
1401  */
1402 static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data)
1403 {
1404         struct omap_hsmmc_host *host = cb_data;
1405         struct mmc_data *data;
1406         int dma_ch, req_in_progress;
1407
1408         if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
1409                 dev_warn(mmc_dev(host->mmc), "unexpected dma status %x\n",
1410                         ch_status);
1411                 return;
1412         }
1413
1414         spin_lock(&host->irq_lock);
1415         if (host->dma_ch < 0) {
1416                 spin_unlock(&host->irq_lock);
1417                 return;
1418         }
1419
1420         data = host->mrq->data;
1421         host->dma_sg_idx++;
1422         if (host->dma_sg_idx < host->dma_len) {
1423                 /* Fire up the next transfer. */
1424                 omap_hsmmc_config_dma_params(host, data,
1425                                            data->sg + host->dma_sg_idx);
1426                 spin_unlock(&host->irq_lock);
1427                 return;
1428         }
1429
1430         if (!data->host_cookie)
1431                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1432                              omap_hsmmc_get_dma_dir(host, data));
1433
1434         req_in_progress = host->req_in_progress;
1435         dma_ch = host->dma_ch;
1436         host->dma_ch = -1;
1437         spin_unlock(&host->irq_lock);
1438
1439         omap_free_dma(dma_ch);
1440
1441         /* If DMA has finished after TC, complete the request */
1442         if (!req_in_progress) {
1443                 struct mmc_request *mrq = host->mrq;
1444
1445                 host->mrq = NULL;
1446                 mmc_request_done(host->mmc, mrq);
1447         }
1448 }
1449
1450 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1451                                        struct mmc_data *data,
1452                                        struct omap_hsmmc_next *next)
1453 {
1454         int dma_len;
1455
1456         if (!next && data->host_cookie &&
1457             data->host_cookie != host->next_data.cookie) {
1458                 pr_warning("[%s] invalid cookie: data->host_cookie %d"
1459                        " host->next_data.cookie %d\n",
1460                        __func__, data->host_cookie, host->next_data.cookie);
1461                 data->host_cookie = 0;
1462         }
1463
1464         /* Check if next job is already prepared */
1465         if (next ||
1466             (!next && data->host_cookie != host->next_data.cookie)) {
1467                 dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
1468                                      data->sg_len,
1469                                      omap_hsmmc_get_dma_dir(host, data));
1470
1471         } else {
1472                 dma_len = host->next_data.dma_len;
1473                 host->next_data.dma_len = 0;
1474         }
1475
1476
1477         if (dma_len == 0)
1478                 return -EINVAL;
1479
1480         if (next) {
1481                 next->dma_len = dma_len;
1482                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1483         } else
1484                 host->dma_len = dma_len;
1485
1486         return 0;
1487 }
1488
1489 /*
1490  * Routine to configure and start DMA for the MMC card
1491  */
1492 static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
1493                                         struct mmc_request *req)
1494 {
1495         int dma_ch = 0, ret = 0, i;
1496         struct mmc_data *data = req->data;
1497
1498         /* Sanity check: all the SG entries must be aligned by block size. */
1499         for (i = 0; i < data->sg_len; i++) {
1500                 struct scatterlist *sgl;
1501
1502                 sgl = data->sg + i;
1503                 if (sgl->length % data->blksz)
1504                         return -EINVAL;
1505         }
1506         if ((data->blksz % 4) != 0)
1507                 /* REVISIT: The MMC buffer increments only when MSB is written.
1508                  * Return error for blksz which is non multiple of four.
1509                  */
1510                 return -EINVAL;
1511
1512         BUG_ON(host->dma_ch != -1);
1513
1514         ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
1515                                "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
1516         if (ret != 0) {
1517                 dev_err(mmc_dev(host->mmc),
1518                         "%s: omap_request_dma() failed with %d\n",
1519                         mmc_hostname(host->mmc), ret);
1520                 return ret;
1521         }
1522         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL);
1523         if (ret)
1524                 return ret;
1525
1526         host->dma_ch = dma_ch;
1527         host->dma_sg_idx = 0;
1528
1529         omap_hsmmc_config_dma_params(host, data, data->sg);
1530
1531         return 0;
1532 }
1533
1534 static void set_data_timeout(struct omap_hsmmc_host *host)
1535 {
1536         uint32_t reg, clkd, dto = 0;
1537
1538         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1539         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1540         if (clkd == 0)
1541                 clkd = 1;
1542
1543     /* Use the maximum timeout value allowed in the standard of 14 or 0xE */
1544         dto = 14;
1545
1546         reg &= ~DTO_MASK;
1547         reg |= dto << DTO_SHIFT;
1548         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1549 }
1550
1551 /*
1552  * Configure block length for MMC/SD cards and initiate the transfer.
1553  */
1554 static int
1555 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1556 {
1557         int ret;
1558         host->data = req->data;
1559
1560         if (req->data == NULL) {
1561                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1562                 /*
1563                  * Set an arbitrary 100ms data timeout for commands with
1564                  * busy signal.
1565                  */
1566                 if (req->cmd->flags & MMC_RSP_BUSY)
1567                         set_data_timeout(host);
1568                 return 0;
1569         }
1570
1571         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1572                                         | (req->data->blocks << 16));
1573         set_data_timeout(host);
1574
1575         if (host->use_dma) {
1576                 ret = omap_hsmmc_start_dma_transfer(host, req);
1577                 if (ret != 0) {
1578                         dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
1579                         return ret;
1580                 }
1581         }
1582         return 0;
1583 }
1584
1585 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1586                                 int err)
1587 {
1588         struct omap_hsmmc_host *host = mmc_priv(mmc);
1589         struct mmc_data *data = mrq->data;
1590
1591         if (host->use_dma) {
1592                 if (data->host_cookie)
1593                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
1594                                      data->sg_len,
1595                                      omap_hsmmc_get_dma_dir(host, data));
1596                 data->host_cookie = 0;
1597         }
1598 }
1599
1600 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1601                                bool is_first_req)
1602 {
1603         struct omap_hsmmc_host *host = mmc_priv(mmc);
1604
1605         if (mrq->data->host_cookie) {
1606                 mrq->data->host_cookie = 0;
1607                 return ;
1608         }
1609
1610         if (host->use_dma)
1611                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1612                                                 &host->next_data))
1613                         mrq->data->host_cookie = 0;
1614 }
1615
1616 #define BWR (1 << 4)
1617 #define BRR (1 << 5)
1618
1619 static void omap_hsmmc_request_do_pio(struct mmc_host *mmc,
1620         struct mmc_request *req)
1621 {
1622         struct omap_hsmmc_host *host = mmc_priv(mmc);
1623         u32 *data = sg_virt(req->data->sg);
1624         u32 len = req->data->sg->length;
1625         int stat;
1626         int i;
1627
1628         for (i = 0; i < 10000000; i++) {
1629                 stat = OMAP_HSMMC_READ(host->base, STAT);
1630                 if (stat == 0)
1631                         continue;
1632
1633                 //dev_err(mmc_dev(host->mmc), "stat %x, l %d\n", stat, i);
1634
1635                 if (stat & (DATA_TIMEOUT | DATA_CRC))
1636                         omap_hsmmc_reset_controller_fsm(host, SRD);
1637
1638                 if (stat & ERR) {
1639                         req->cmd->error =
1640                         req->data->error = -EINVAL; // ?
1641                         omap_hsmmc_xfer_done(host, host->data);
1642                         return;
1643                 }
1644
1645                 if (req->data->flags & MMC_DATA_WRITE) {
1646                         while (len > 0 && (stat & BWR)) {
1647                                 OMAP_HSMMC_WRITE(host->base, DATA, *data++);
1648                                 len -= 4;
1649                         }
1650                 } else {
1651                         while (len > 0 && (stat & BRR)) {
1652                                 *data++ = OMAP_HSMMC_READ(host->base, DATA);
1653                                 len -= 4;
1654                         }
1655                 }
1656
1657                 if ((stat & CC) && host->cmd)
1658                         omap_hsmmc_cmd_done(host, host->cmd);
1659                 if ((stat & TC) && host->mrq) {
1660                         omap_hsmmc_xfer_done(host, host->data);
1661                         break;
1662                 }
1663         }
1664
1665         if (len > 0) {
1666                 req->cmd->error =
1667                 req->data->error = -ETIMEDOUT;
1668                 omap_hsmmc_xfer_done(host, req->data);
1669         }
1670 }
1671
1672 /*
1673  * Request function. for read/write operation
1674  */
1675 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1676 {
1677         struct omap_hsmmc_host *host = mmc_priv(mmc);
1678         int err;
1679
1680         BUG_ON(host->req_in_progress);
1681         BUG_ON(host->dma_ch != -1);
1682         if (host->protect_card) {
1683                 if (host->reqs_blocked < 3) {
1684                         /*
1685                          * Ensure the controller is left in a consistent
1686                          * state by resetting the command and data state
1687                          * machines.
1688                          */
1689                         omap_hsmmc_reset_controller_fsm(host, SRD);
1690                         omap_hsmmc_reset_controller_fsm(host, SRC);
1691                         host->reqs_blocked += 1;
1692                 }
1693                 req->cmd->error = -EBADF;
1694                 if (req->data)
1695                         req->data->error = -EBADF;
1696                 req->cmd->retries = 0;
1697                 mmc_request_done(mmc, req);
1698                 return;
1699         } else if (host->reqs_blocked)
1700                 host->reqs_blocked = 0;
1701
1702         /* pandora wifi hack.. */
1703         if (host->id == OMAP_MMC3_DEVID && req->data != NULL
1704             && req->data->sg_len == 1 && req->data->sg->length <= 16) {
1705                 host->use_dma = 0;
1706         } else {
1707                 host->use_dma = 1;
1708         }
1709
1710         WARN_ON(host->mrq != NULL);
1711         host->mrq = req;
1712         err = omap_hsmmc_prepare_data(host, req);
1713         if (err) {
1714                 req->cmd->error = err;
1715                 if (req->data)
1716                         req->data->error = err;
1717                 host->mrq = NULL;
1718                 mmc_request_done(mmc, req);
1719                 return;
1720         }
1721
1722         omap_hsmmc_start_command(host, req->cmd, req->data);
1723
1724         if (host->use_dma == 0)
1725                 omap_hsmmc_request_do_pio(mmc, req);
1726 }
1727
1728 /* Routine to configure clock values. Exposed API to core */
1729 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1730 {
1731         struct omap_hsmmc_host *host = mmc_priv(mmc);
1732         int do_send_init_stream = 0;
1733
1734         pm_runtime_get_sync(host->dev);
1735
1736         if (ios->power_mode != host->power_mode) {
1737                 switch (ios->power_mode) {
1738                 case MMC_POWER_OFF:
1739                         mmc_slot(host).set_power(host->dev, host->slot_id,
1740                                                  0, 0);
1741                         host->vdd = 0;
1742                         break;
1743                 case MMC_POWER_UP:
1744                         mmc_slot(host).set_power(host->dev, host->slot_id,
1745                                                  1, ios->vdd);
1746                         host->vdd = ios->vdd;
1747                         break;
1748                 case MMC_POWER_ON:
1749                         do_send_init_stream = 1;
1750                         break;
1751                 }
1752                 host->power_mode = ios->power_mode;
1753         }
1754
1755         /* FIXME: set registers based only on changes to ios */
1756
1757         omap_hsmmc_set_bus_width(host);
1758
1759         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1760                 /* Only MMC1 can interface at 3V without some flavor
1761                  * of external transceiver; but they all handle 1.8V.
1762                  */
1763                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1764                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1765                                 /*
1766                                  * The mmc_select_voltage fn of the core does
1767                                  * not seem to set the power_mode to
1768                                  * MMC_POWER_UP upon recalculating the voltage.
1769                                  * vdd 1.8v.
1770                                  */
1771                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1772                                 dev_dbg(mmc_dev(host->mmc),
1773                                                 "Switch operation failed\n");
1774                 }
1775         }
1776
1777         omap_hsmmc_set_clock(host);
1778
1779         if (do_send_init_stream)
1780                 send_init_stream(host);
1781
1782         omap_hsmmc_set_bus_mode(host);
1783
1784         pm_runtime_put_autosuspend(host->dev);
1785 }
1786
1787 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1788 {
1789         struct omap_hsmmc_host *host = mmc_priv(mmc);
1790
1791         if (!mmc_slot(host).card_detect)
1792                 return -ENOSYS;
1793         return mmc_slot(host).card_detect(host->dev, host->slot_id);
1794 }
1795
1796 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1797 {
1798         struct omap_hsmmc_host *host = mmc_priv(mmc);
1799
1800         if (!mmc_slot(host).get_ro)
1801                 return -ENOSYS;
1802         return mmc_slot(host).get_ro(host->dev, 0);
1803 }
1804
1805 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1806 {
1807         struct omap_hsmmc_host *host = mmc_priv(mmc);
1808
1809         if (mmc_slot(host).init_card)
1810                 mmc_slot(host).init_card(card);
1811 }
1812
1813 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1814 {
1815         u32 hctl, capa, value;
1816
1817         /* Only MMC1 supports 3.0V */
1818         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1819                 hctl = SDVS30;
1820                 capa = VS30 | VS18;
1821         } else {
1822                 hctl = SDVS18;
1823                 capa = VS18;
1824         }
1825
1826         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1827         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1828
1829         value = OMAP_HSMMC_READ(host->base, CAPA);
1830         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1831
1832         /* Set the controller to AUTO IDLE mode */
1833         value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
1834         OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
1835
1836         /* Set SD bus power bit */
1837         set_sd_bus_power(host);
1838 }
1839
1840 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1841 {
1842         struct omap_hsmmc_host *host = mmc_priv(mmc);
1843
1844         pm_runtime_get_sync(host->dev);
1845
1846         return 0;
1847 }
1848
1849 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
1850 {
1851         struct omap_hsmmc_host *host = mmc_priv(mmc);
1852
1853         pm_runtime_mark_last_busy(host->dev);
1854         pm_runtime_put_autosuspend(host->dev);
1855
1856         return 0;
1857 }
1858
1859 static const struct mmc_host_ops omap_hsmmc_ops = {
1860         .enable = omap_hsmmc_enable_fclk,
1861         .disable = omap_hsmmc_disable_fclk,
1862         .post_req = omap_hsmmc_post_req,
1863         .pre_req = omap_hsmmc_pre_req,
1864         .request = omap_hsmmc_request,
1865         .set_ios = omap_hsmmc_set_ios,
1866         .get_cd = omap_hsmmc_get_cd,
1867         .get_ro = omap_hsmmc_get_ro,
1868         .init_card = omap_hsmmc_init_card,
1869         /* NYET -- enable_sdio_irq */
1870 };
1871
1872 #ifdef CONFIG_DEBUG_FS
1873
1874 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1875 {
1876         struct mmc_host *mmc = s->private;
1877         struct omap_hsmmc_host *host = mmc_priv(mmc);
1878         int context_loss = 0;
1879
1880         if (host->pdata->get_context_loss_count)
1881                 context_loss = host->pdata->get_context_loss_count(host->dev);
1882
1883         seq_printf(s, "mmc%d:\n"
1884                         " enabled:\t%d\n"
1885                         " dpm_state:\t%d\n"
1886                         " nesting_cnt:\t%d\n"
1887                         " ctx_loss:\t%d:%d\n"
1888                         "\nregs:\n",
1889                         mmc->index, mmc->enabled ? 1 : 0,
1890                         host->dpm_state, mmc->nesting_cnt,
1891                         host->context_loss, context_loss);
1892
1893         if (host->suspended) {
1894                 seq_printf(s, "host suspended, can't read registers\n");
1895                 return 0;
1896         }
1897
1898         pm_runtime_get_sync(host->dev);
1899
1900         seq_printf(s, "SYSCONFIG:\t0x%08x\n",
1901                         OMAP_HSMMC_READ(host->base, SYSCONFIG));
1902         seq_printf(s, "CON:\t\t0x%08x\n",
1903                         OMAP_HSMMC_READ(host->base, CON));
1904         seq_printf(s, "HCTL:\t\t0x%08x\n",
1905                         OMAP_HSMMC_READ(host->base, HCTL));
1906         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1907                         OMAP_HSMMC_READ(host->base, SYSCTL));
1908         seq_printf(s, "IE:\t\t0x%08x\n",
1909                         OMAP_HSMMC_READ(host->base, IE));
1910         seq_printf(s, "ISE:\t\t0x%08x\n",
1911                         OMAP_HSMMC_READ(host->base, ISE));
1912         seq_printf(s, "CAPA:\t\t0x%08x\n",
1913                         OMAP_HSMMC_READ(host->base, CAPA));
1914
1915         pm_runtime_mark_last_busy(host->dev);
1916         pm_runtime_put_autosuspend(host->dev);
1917
1918         return 0;
1919 }
1920
1921 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1922 {
1923         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1924 }
1925
1926 static const struct file_operations mmc_regs_fops = {
1927         .open           = omap_hsmmc_regs_open,
1928         .read           = seq_read,
1929         .llseek         = seq_lseek,
1930         .release        = single_release,
1931 };
1932
1933 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1934 {
1935         if (mmc->debugfs_root)
1936                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1937                         mmc, &mmc_regs_fops);
1938 }
1939
1940 #else
1941
1942 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1943 {
1944 }
1945
1946 #endif
1947
1948 static int __init omap_hsmmc_probe(struct platform_device *pdev)
1949 {
1950         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1951         struct mmc_host *mmc;
1952         struct omap_hsmmc_host *host = NULL;
1953         struct resource *res;
1954         int ret, irq;
1955
1956         if (pdata == NULL) {
1957                 dev_err(&pdev->dev, "Platform Data is missing\n");
1958                 return -ENXIO;
1959         }
1960
1961         if (pdata->nr_slots == 0) {
1962                 dev_err(&pdev->dev, "No Slots\n");
1963                 return -ENXIO;
1964         }
1965
1966         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1967         irq = platform_get_irq(pdev, 0);
1968         if (res == NULL || irq < 0)
1969                 return -ENXIO;
1970
1971         res->start += pdata->reg_offset;
1972         res->end += pdata->reg_offset;
1973         res = request_mem_region(res->start, resource_size(res), pdev->name);
1974         if (res == NULL)
1975                 return -EBUSY;
1976
1977         ret = omap_hsmmc_gpio_init(pdata);
1978         if (ret)
1979                 goto err;
1980
1981         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1982         if (!mmc) {
1983                 ret = -ENOMEM;
1984                 goto err_alloc;
1985         }
1986
1987         host            = mmc_priv(mmc);
1988         host->mmc       = mmc;
1989         host->pdata     = pdata;
1990         host->dev       = &pdev->dev;
1991         host->use_dma   = 1;
1992         host->dev->dma_mask = &pdata->dma_mask;
1993         host->dma_ch    = -1;
1994         host->irq       = irq;
1995         host->id        = pdev->id;
1996         host->slot_id   = 0;
1997         host->mapbase   = res->start;
1998         host->base      = ioremap(host->mapbase, SZ_4K);
1999         host->power_mode = MMC_POWER_OFF;
2000         host->next_data.cookie = 1;
2001
2002         platform_set_drvdata(pdev, host);
2003
2004         mmc->ops        = &omap_hsmmc_ops;
2005
2006         /*
2007          * If regulator_disable can only put vcc_aux to sleep then there is
2008          * no off state.
2009          */
2010         if (mmc_slot(host).vcc_aux_disable_is_sleep)
2011                 mmc_slot(host).no_off = 1;
2012
2013         mmc->f_min      = OMAP_MMC_MIN_CLOCK;
2014         mmc->f_max      = OMAP_MMC_MAX_CLOCK;
2015
2016         spin_lock_init(&host->irq_lock);
2017
2018         host->fclk = clk_get(&pdev->dev, "fck");
2019         if (IS_ERR(host->fclk)) {
2020                 ret = PTR_ERR(host->fclk);
2021                 host->fclk = NULL;
2022                 goto err1;
2023         }
2024
2025         omap_hsmmc_context_save(host);
2026
2027         mmc->caps |= MMC_CAP_DISABLE;
2028
2029         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
2030                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
2031                 mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
2032         }
2033
2034         pm_runtime_enable(host->dev);
2035         pm_runtime_get_sync(host->dev);
2036         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
2037         pm_runtime_use_autosuspend(host->dev);
2038
2039         if (cpu_is_omap2430()) {
2040                 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
2041                 /*
2042                  * MMC can still work without debounce clock.
2043                  */
2044                 if (IS_ERR(host->dbclk))
2045                         dev_warn(mmc_dev(host->mmc),
2046                                 "Failed to get debounce clock\n");
2047                 else
2048                         host->got_dbclk = 1;
2049
2050                 if (host->got_dbclk)
2051                         if (clk_enable(host->dbclk) != 0)
2052                                 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
2053                                                         " clk failed\n");
2054         }
2055
2056         /* Since we do only SG emulation, we can have as many segs
2057          * as we want. */
2058         mmc->max_segs = 1024;
2059
2060         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
2061         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
2062         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2063         mmc->max_seg_size = mmc->max_req_size;
2064
2065         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2066                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
2067
2068         mmc->caps |= mmc_slot(host).caps;
2069         if (mmc->caps & MMC_CAP_8_BIT_DATA)
2070                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2071
2072         if (mmc_slot(host).nonremovable)
2073                 mmc->caps |= MMC_CAP_NONREMOVABLE;
2074
2075         omap_hsmmc_conf_bus_power(host);
2076
2077         /* Select DMA lines */
2078         switch (host->id) {
2079         case OMAP_MMC1_DEVID:
2080                 host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
2081                 host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
2082                 break;
2083         case OMAP_MMC2_DEVID:
2084                 host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
2085                 host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
2086                 break;
2087         case OMAP_MMC3_DEVID:
2088                 host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
2089                 host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
2090                 break;
2091         case OMAP_MMC4_DEVID:
2092                 host->dma_line_tx = OMAP44XX_DMA_MMC4_TX;
2093                 host->dma_line_rx = OMAP44XX_DMA_MMC4_RX;
2094                 break;
2095         case OMAP_MMC5_DEVID:
2096                 host->dma_line_tx = OMAP44XX_DMA_MMC5_TX;
2097                 host->dma_line_rx = OMAP44XX_DMA_MMC5_RX;
2098                 break;
2099         default:
2100                 dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
2101                 goto err_irq;
2102         }
2103
2104         /* Request IRQ for MMC operations */
2105         ret = request_irq(host->irq, omap_hsmmc_irq, 0,
2106                         mmc_hostname(mmc), host);
2107         if (ret) {
2108                 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2109                 goto err_irq;
2110         }
2111
2112         if (pdata->init != NULL) {
2113                 if (pdata->init(&pdev->dev) != 0) {
2114                         dev_dbg(mmc_dev(host->mmc),
2115                                 "Unable to configure MMC IRQs\n");
2116                         goto err_irq_cd_init;
2117                 }
2118         }
2119
2120         if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
2121                 ret = omap_hsmmc_reg_get(host);
2122                 if (ret)
2123                         goto err_reg;
2124                 host->use_reg = 1;
2125         }
2126
2127         mmc->ocr_avail = mmc_slot(host).ocr_mask;
2128
2129         /* Request IRQ for card detect */
2130         if ((mmc_slot(host).card_detect_irq)) {
2131                 ret = request_threaded_irq(mmc_slot(host).card_detect_irq,
2132                                            NULL,
2133                                            omap_hsmmc_detect,
2134                                            IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
2135                                            mmc_hostname(mmc), host);
2136                 if (ret) {
2137                         dev_dbg(mmc_dev(host->mmc),
2138                                 "Unable to grab MMC CD IRQ\n");
2139                         goto err_irq_cd;
2140                 }
2141                 pdata->suspend = omap_hsmmc_suspend_cdirq;
2142                 pdata->resume = omap_hsmmc_resume_cdirq;
2143         }
2144
2145         omap_hsmmc_disable_irq(host);
2146
2147         omap_hsmmc_protect_card(host);
2148
2149         mmc_add_host(mmc);
2150
2151         if (mmc_slot(host).name != NULL) {
2152                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2153                 if (ret < 0)
2154                         goto err_slot_name;
2155         }
2156         if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
2157                 ret = device_create_file(&mmc->class_dev,
2158                                         &dev_attr_cover_switch);
2159                 if (ret < 0)
2160                         goto err_slot_name;
2161         }
2162
2163         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
2164                 ret = device_create_file(&mmc->class_dev, &dev_attr_unsafe_read);
2165
2166                 /* MMC_CAP2_NO_MULTI_READ makes it crawl, try a different workaround */
2167                 mmc->caps2 &= ~MMC_CAP2_NO_MULTI_READ;
2168                 mmc->max_segs = 1;
2169                 mmc->f_max = 32000000;
2170         }
2171
2172         omap_hsmmc_debugfs(mmc);
2173         pm_runtime_mark_last_busy(host->dev);
2174         pm_runtime_put_autosuspend(host->dev);
2175
2176         return 0;
2177
2178 err_slot_name:
2179         mmc_remove_host(mmc);
2180         free_irq(mmc_slot(host).card_detect_irq, host);
2181 err_irq_cd:
2182         if (host->use_reg)
2183                 omap_hsmmc_reg_put(host);
2184 err_reg:
2185         if (host->pdata->cleanup)
2186                 host->pdata->cleanup(&pdev->dev);
2187 err_irq_cd_init:
2188         free_irq(host->irq, host);
2189 err_irq:
2190         pm_runtime_mark_last_busy(host->dev);
2191         pm_runtime_put_autosuspend(host->dev);
2192         clk_put(host->fclk);
2193         if (host->got_dbclk) {
2194                 clk_disable(host->dbclk);
2195                 clk_put(host->dbclk);
2196         }
2197 err1:
2198         iounmap(host->base);
2199         platform_set_drvdata(pdev, NULL);
2200         mmc_free_host(mmc);
2201 err_alloc:
2202         omap_hsmmc_gpio_free(pdata);
2203 err:
2204         release_mem_region(res->start, resource_size(res));
2205         return ret;
2206 }
2207
2208 static int omap_hsmmc_remove(struct platform_device *pdev)
2209 {
2210         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2211         struct resource *res;
2212
2213         if (host) {
2214                 pm_runtime_get_sync(host->dev);
2215                 mmc_remove_host(host->mmc);
2216                 if (host->use_reg)
2217                         omap_hsmmc_reg_put(host);
2218                 if (host->pdata->cleanup)
2219                         host->pdata->cleanup(&pdev->dev);
2220                 free_irq(host->irq, host);
2221                 if (mmc_slot(host).card_detect_irq)
2222                         free_irq(mmc_slot(host).card_detect_irq, host);
2223
2224                 pm_runtime_put_sync(host->dev);
2225                 pm_runtime_disable(host->dev);
2226                 clk_put(host->fclk);
2227                 if (host->got_dbclk) {
2228                         clk_disable(host->dbclk);
2229                         clk_put(host->dbclk);
2230                 }
2231
2232                 mmc_free_host(host->mmc);
2233                 iounmap(host->base);
2234                 omap_hsmmc_gpio_free(pdev->dev.platform_data);
2235         }
2236
2237         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2238         if (res)
2239                 release_mem_region(res->start, resource_size(res));
2240         platform_set_drvdata(pdev, NULL);
2241
2242         return 0;
2243 }
2244
2245 #ifdef CONFIG_PM
2246 static int omap_hsmmc_suspend(struct device *dev)
2247 {
2248         int ret = 0;
2249         struct platform_device *pdev = to_platform_device(dev);
2250         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2251
2252         if (host && host->suspended)
2253                 return 0;
2254
2255         if (host) {
2256                 pm_runtime_get_sync(host->dev);
2257                 host->suspended = 1;
2258                 if (host->pdata->suspend) {
2259                         ret = host->pdata->suspend(&pdev->dev,
2260                                                         host->slot_id);
2261                         if (ret) {
2262                                 dev_dbg(mmc_dev(host->mmc),
2263                                         "Unable to handle MMC board"
2264                                         " level suspend\n");
2265                                 host->suspended = 0;
2266                                 return ret;
2267                         }
2268                 }
2269                 ret = mmc_suspend_host(host->mmc);
2270
2271                 if (ret == 0) {
2272                         omap_hsmmc_disable_irq(host);
2273                         OMAP_HSMMC_WRITE(host->base, HCTL,
2274                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2275                         if (host->got_dbclk)
2276                                 clk_disable(host->dbclk);
2277                 } else {
2278                         host->suspended = 0;
2279                         if (host->pdata->resume) {
2280                                 if (host->pdata->resume(&pdev->dev, host->slot_id))
2281                                         dev_dbg(mmc_dev(host->mmc),
2282                                                 "Unmask interrupt failed\n");
2283                         }
2284                 }
2285                 pm_runtime_put_sync(host->dev);
2286         }
2287         return ret;
2288 }
2289
2290 /* Routine to resume the MMC device */
2291 static int omap_hsmmc_resume(struct device *dev)
2292 {
2293         int ret = 0;
2294         struct platform_device *pdev = to_platform_device(dev);
2295         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2296
2297         if (host && !host->suspended)
2298                 return 0;
2299
2300         if (host) {
2301                 pm_runtime_get_sync(host->dev);
2302
2303                 if (host->got_dbclk)
2304                         clk_enable(host->dbclk);
2305
2306                 omap_hsmmc_conf_bus_power(host);
2307
2308                 if (host->pdata->resume) {
2309                         ret = host->pdata->resume(&pdev->dev, host->slot_id);
2310                         if (ret)
2311                                 dev_dbg(mmc_dev(host->mmc),
2312                                         "Unmask interrupt failed\n");
2313                 }
2314
2315                 omap_hsmmc_protect_card(host);
2316
2317                 /* Notify the core to resume the host */
2318                 ret = mmc_resume_host(host->mmc);
2319                 if (ret == 0)
2320                         host->suspended = 0;
2321
2322                 pm_runtime_mark_last_busy(host->dev);
2323                 pm_runtime_put_autosuspend(host->dev);
2324         }
2325
2326         return ret;
2327
2328 }
2329
2330 #else
2331 #define omap_hsmmc_suspend      NULL
2332 #define omap_hsmmc_resume               NULL
2333 #endif
2334
2335 static int omap_hsmmc_runtime_suspend(struct device *dev)
2336 {
2337         struct omap_hsmmc_host *host;
2338
2339         host = platform_get_drvdata(to_platform_device(dev));
2340         omap_hsmmc_context_save(host);
2341         dev_dbg(mmc_dev(host->mmc), "disabled\n");
2342
2343         return 0;
2344 }
2345
2346 static int omap_hsmmc_runtime_resume(struct device *dev)
2347 {
2348         struct omap_hsmmc_host *host;
2349
2350         host = platform_get_drvdata(to_platform_device(dev));
2351         omap_hsmmc_context_restore(host);
2352         dev_dbg(mmc_dev(host->mmc), "enabled\n");
2353
2354         return 0;
2355 }
2356
2357 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2358         .suspend        = omap_hsmmc_suspend,
2359         .resume         = omap_hsmmc_resume,
2360         .runtime_suspend = omap_hsmmc_runtime_suspend,
2361         .runtime_resume = omap_hsmmc_runtime_resume,
2362 };
2363
2364 static struct platform_driver omap_hsmmc_driver = {
2365         .remove         = omap_hsmmc_remove,
2366         .driver         = {
2367                 .name = DRIVER_NAME,
2368                 .owner = THIS_MODULE,
2369                 .pm = &omap_hsmmc_dev_pm_ops,
2370         },
2371 };
2372
2373 static int __init omap_hsmmc_init(void)
2374 {
2375         /* Register the MMC driver */
2376         return platform_driver_probe(&omap_hsmmc_driver, omap_hsmmc_probe);
2377 }
2378
2379 static void __exit omap_hsmmc_cleanup(void)
2380 {
2381         /* Unregister MMC driver */
2382         platform_driver_unregister(&omap_hsmmc_driver);
2383 }
2384
2385 module_init(omap_hsmmc_init);
2386 module_exit(omap_hsmmc_cleanup);
2387
2388 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2389 MODULE_LICENSE("GPL");
2390 MODULE_ALIAS("platform:" DRIVER_NAME);
2391 MODULE_AUTHOR("Texas Instruments Inc");