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    <[email protected]>
  10  *      Madhusudhan             <[email protected]>
  11  *      Mohit Jalori            <[email protected]>
  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/dmaengine.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/delay.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/timer.h>
  29 #include <linux/clk.h>
  30 #include <linux/of.h>
  31 #include <linux/of_gpio.h>
  32 #include <linux/of_device.h>
  33 #include <linux/omap-dma.h>
  34 #include <linux/mmc/host.h>
  35 #include <linux/mmc/core.h>
  36 #include <linux/mmc/mmc.h>
  37 #include <linux/io.h>
  38 #include <linux/gpio.h>
  39 #include <linux/regulator/consumer.h>
  40 #include <linux/pinctrl/consumer.h>
  41 #include <linux/pm_runtime.h>
  42 #include <linux/platform_data/mmc-omap.h>
  43
  44 /* OMAP HSMMC Host Controller Registers */
  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 HSS                     (1 << 21)
  65 #define SDVS18                  (0x5 << 9)
  66 #define SDVS30                  (0x6 << 9)
  67 #define SDVS33                  (0x7 << 9)
  68 #define SDVS_MASK               0x00000E00
  69 #define SDVSCLR                 0xFFFFF1FF
  70 #define SDVSDET                 0x00000400
  71 #define AUTOIDLE                0x1
  72 #define SDBP                    (1 << 8)
  73 #define DTO                     0xe
  74 #define ICE                     0x1
  75 #define ICS                     0x2
  76 #define CEN                     (1 << 2)
  77 #define CLKD_MASK               0x0000FFC0
  78 #define CLKD_SHIFT              6
  79 #define DTO_MASK                0x000F0000
  80 #define DTO_SHIFT               16
  81 #define INIT_STREAM             (1 << 1)
  82 #define DP_SELECT               (1 << 21)
  83 #define DDIR                    (1 << 4)
  84 #define DMAE                    0x1
  85 #define MSBS                    (1 << 5)
  86 #define BCE                     (1 << 1)
  87 #define FOUR_BIT                (1 << 1)
  88 #define HSPE                    (1 << 2)
  89 #define DDR                     (1 << 19)
  90 #define DW8                     (1 << 5)
  91 #define OD                      0x1
  92 #define STAT_CLEAR              0xFFFFFFFF
  93 #define INIT_STREAM_CMD         0x00000000
  94 #define DUAL_VOLT_OCR_BIT       7
  95 #define SRC                     (1 << 25)
  96 #define SRD                     (1 << 26)
  97 #define SOFTRESET               (1 << 1)
  98 #define RESETDONE               (1 << 0)
  99
 100 /* Interrupt masks for IE and ISE register */
 101 #define CC_EN                   (1 << 0)
 102 #define TC_EN                   (1 << 1)
 103 #define BWR_EN                  (1 << 4)
 104 #define BRR_EN                  (1 << 5)
 105 #define ERR_EN                  (1 << 15)
 106 #define CTO_EN                  (1 << 16)
 107 #define CCRC_EN                 (1 << 17)
 108 #define CEB_EN                  (1 << 18)
 109 #define CIE_EN                  (1 << 19)
 110 #define DTO_EN                  (1 << 20)
 111 #define DCRC_EN                 (1 << 21)
 112 #define DEB_EN                  (1 << 22)
 113 #define CERR_EN                 (1 << 28)
 114 #define BADA_EN                 (1 << 29)
 115
 116 #define INT_EN_MASK             (BADA_EN | CERR_EN | DEB_EN | DCRC_EN |\
 117                 DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
 118                 BRR_EN | BWR_EN | TC_EN | CC_EN)
 119
 120 #define MMC_AUTOSUSPEND_DELAY   100
 121 #define MMC_TIMEOUT_MS          20
 122 #define OMAP_MMC_MIN_CLOCK      400000
 123 #define OMAP_MMC_MAX_CLOCK      52000000
 124 #define DRIVER_NAME             "omap_hsmmc"
 125
 126 /*
 127  * One controller can have multiple slots, like on some omap boards using
 128  * omap.c controller driver. Luckily this is not currently done on any known
 129  * omap_hsmmc.c device.
 130  */
 131 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
 132
 133 /*
 134  * MMC Host controller read/write API's
 135  */
 136 #define OMAP_HSMMC_READ(base, reg)      \
 137         __raw_readl((base) + OMAP_HSMMC_##reg)
 138
 139 #define OMAP_HSMMC_WRITE(base, reg, val) \
 140         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
 141
 142 struct omap_hsmmc_next {
 143         unsigned int    dma_len;
 144         s32             cookie;
 145 };
 146
 147 struct omap_hsmmc_host {
 148         struct  device          *dev;
 149         struct  mmc_host        *mmc;
 150         struct  mmc_request     *mrq;
 151         struct  mmc_command     *cmd;
 152         struct  mmc_data        *data;
 153         struct  clk             *fclk;
 154         struct  clk             *dbclk;
 155         /*
 156          * vcc == configured supply
 157          * vcc_aux == optional
 158          *   -  MMC1, supply for DAT4..DAT7
 159          *   -  MMC2/MMC2, external level shifter voltage supply, for
 160          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
 161          */
 162         struct  regulator       *vcc;
 163         struct  regulator       *vcc_aux;
 164         void    __iomem         *base;
 165         resource_size_t         mapbase;
 166         spinlock_t              irq_lock; /* Prevent races with irq handler */
 167         unsigned int            dma_len;
 168         unsigned int            dma_sg_idx;
 169         unsigned char           bus_mode;
 170         unsigned char           power_mode;
 171         int                     suspended;
 172         int                     irq;
 173         int                     use_dma, dma_ch;
 174         struct dma_chan         *tx_chan;
 175         struct dma_chan         *rx_chan;
 176         int                     slot_id;
 177         int                     response_busy;
 178         int                     context_loss;
 179         int                     protect_card;
 180         int                     reqs_blocked;
 181         int                     use_reg;
 182         int                     req_in_progress;
 183         struct omap_hsmmc_next  next_data;
 184
 185         struct  omap_mmc_platform_data  *pdata;
 186 };
 187
 188 static int omap_hsmmc_card_detect(struct device *dev, int slot)
 189 {
 190         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 191         struct omap_mmc_platform_data *mmc = host->pdata;
 192
 193         /* NOTE: assumes card detect signal is active-low */
 194         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 195 }
 196
 197 static int omap_hsmmc_get_wp(struct device *dev, int slot)
 198 {
 199         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 200         struct omap_mmc_platform_data *mmc = host->pdata;
 201
 202         /* NOTE: assumes write protect signal is active-high */
 203         return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
 204 }
 205
 206 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
 207 {
 208         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 209         struct omap_mmc_platform_data *mmc = host->pdata;
 210
 211         /* NOTE: assumes card detect signal is active-low */
 212         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 213 }
 214
 215 #ifdef CONFIG_PM
 216
 217 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
 218 {
 219         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 220         struct omap_mmc_platform_data *mmc = host->pdata;
 221
 222         disable_irq(mmc->slots[0].card_detect_irq);
 223         return 0;
 224 }
 225
 226 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
 227 {
 228         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 229         struct omap_mmc_platform_data *mmc = host->pdata;
 230
 231         enable_irq(mmc->slots[0].card_detect_irq);
 232         return 0;
 233 }
 234
 235 #else
 236
 237 #define omap_hsmmc_suspend_cdirq        NULL
 238 #define omap_hsmmc_resume_cdirq         NULL
 239
 240 #endif
 241
 242 #ifdef CONFIG_REGULATOR
 243
 244 static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on,
 245                                    int vdd)
 246 {
 247         struct omap_hsmmc_host *host =
 248                 platform_get_drvdata(to_platform_device(dev));
 249         int ret = 0;
 250
 251         /*
 252          * If we don't see a Vcc regulator, assume it's a fixed
 253          * voltage always-on regulator.
 254          */
 255         if (!host->vcc)
 256                 return 0;
 257         /*
 258          * With DT, never turn OFF the regulator. This is because
 259          * the pbias cell programming support is still missing when
 260          * booting with Device tree
 261          */
 262         if (dev->of_node && !vdd)
 263                 return 0;
 264
 265         if (mmc_slot(host).before_set_reg)
 266                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
 267
 268         /*
 269          * Assume Vcc regulator is used only to power the card ... OMAP
 270          * VDDS is used to power the pins, optionally with a transceiver to
 271          * support cards using voltages other than VDDS (1.8V nominal).  When a
 272          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 273          *
 274          * In some cases this regulator won't support enable/disable;
 275          * e.g. it's a fixed rail for a WLAN chip.
 276          *
 277          * In other cases vcc_aux switches interface power.  Example, for
 278          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 279          * chips/cards need an interface voltage rail too.
 280          */
 281         if (power_on) {
 282                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 283                 /* Enable interface voltage rail, if needed */
 284                 if (ret == 0 && host->vcc_aux) {
 285                         ret = regulator_enable(host->vcc_aux);
 286                         if (ret < 0)
 287                                 ret = mmc_regulator_set_ocr(host->mmc,
 288                                                         host->vcc, 0);
 289                 }
 290         } else {
 291                 /* Shut down the rail */
 292                 if (host->vcc_aux)
 293                         ret = regulator_disable(host->vcc_aux);
 294                 if (!ret) {
 295                         /* Then proceed to shut down the local regulator */
 296                         ret = mmc_regulator_set_ocr(host->mmc,
 297                                                 host->vcc, 0);
 298                 }
 299         }
 300
 301         if (mmc_slot(host).after_set_reg)
 302                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
 303
 304         return ret;
 305 }
 306
 307 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 308 {
 309         struct regulator *reg;
 310         int ocr_value = 0;
 311
 312         reg = regulator_get(host->dev, "vmmc");
 313         if (IS_ERR(reg)) {
 314                 dev_err(host->dev, "vmmc regulator missing\n");
 315                 return PTR_ERR(reg);
 316         } else {
 317                 mmc_slot(host).set_power = omap_hsmmc_set_power;
 318                 host->vcc = reg;
 319                 ocr_value = mmc_regulator_get_ocrmask(reg);
 320                 if (!mmc_slot(host).ocr_mask) {
 321                         mmc_slot(host).ocr_mask = ocr_value;
 322                 } else {
 323                         if (!(mmc_slot(host).ocr_mask & ocr_value)) {
 324                                 dev_err(host->dev, "ocrmask %x is not supported\n",
 325                                         mmc_slot(host).ocr_mask);
 326                                 mmc_slot(host).ocr_mask = 0;
 327                                 return -EINVAL;
 328                         }
 329                 }
 330
 331                 /* Allow an aux regulator */
 332                 reg = regulator_get(host->dev, "vmmc_aux");
 333                 host->vcc_aux = IS_ERR(reg) ? NULL : reg;
 334
 335                 /* For eMMC do not power off when not in sleep state */
 336                 if (mmc_slot(host).no_regulator_off_init)
 337                         return 0;
 338                 /*
 339                 * UGLY HACK:  workaround regulator framework bugs.
 340                 * When the bootloader leaves a supply active, it's
 341                 * initialized with zero usecount ... and we can't
 342                 * disable it without first enabling it.  Until the
 343                 * framework is fixed, we need a workaround like this
 344                 * (which is safe for MMC, but not in general).
 345                 */
 346                 if (regulator_is_enabled(host->vcc) > 0 ||
 347                     (host->vcc_aux && regulator_is_enabled(host->vcc_aux))) {
 348                         int vdd = ffs(mmc_slot(host).ocr_mask) - 1;
 349
 350                         mmc_slot(host).set_power(host->dev, host->slot_id,
 351                                                  1, vdd);
 352                         mmc_slot(host).set_power(host->dev, host->slot_id,
 353                                                  0, 0);
 354                 }
 355         }
 356
 357         return 0;
 358 }
 359
 360 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 361 {
 362         regulator_put(host->vcc);
 363         regulator_put(host->vcc_aux);
 364         mmc_slot(host).set_power = NULL;
 365 }
 366
 367 static inline int omap_hsmmc_have_reg(void)
 368 {
 369         return 1;
 370 }
 371
 372 #else
 373
 374 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 375 {
 376         return -EINVAL;
 377 }
 378
 379 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 380 {
 381 }
 382
 383 static inline int omap_hsmmc_have_reg(void)
 384 {
 385         return 0;
 386 }
 387
 388 #endif
 389
 390 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
 391 {
 392         int ret;
 393
 394         if (gpio_is_valid(pdata->slots[0].switch_pin)) {
 395                 if (pdata->slots[0].cover)
 396                         pdata->slots[0].get_cover_state =
 397                                         omap_hsmmc_get_cover_state;
 398                 else
 399                         pdata->slots[0].card_detect = omap_hsmmc_card_detect;
 400                 pdata->slots[0].card_detect_irq =
 401                                 gpio_to_irq(pdata->slots[0].switch_pin);
 402                 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
 403                 if (ret)
 404                         return ret;
 405                 ret = gpio_direction_input(pdata->slots[0].switch_pin);
 406                 if (ret)
 407                         goto err_free_sp;
 408         } else
 409                 pdata->slots[0].switch_pin = -EINVAL;
 410
 411         if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
 412                 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
 413                 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
 414                 if (ret)
 415                         goto err_free_cd;
 416                 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
 417                 if (ret)
 418                         goto err_free_wp;
 419         } else
 420                 pdata->slots[0].gpio_wp = -EINVAL;
 421
 422         return 0;
 423
 424 err_free_wp:
 425         gpio_free(pdata->slots[0].gpio_wp);
 426 err_free_cd:
 427         if (gpio_is_valid(pdata->slots[0].switch_pin))
 428 err_free_sp:
 429                 gpio_free(pdata->slots[0].switch_pin);
 430         return ret;
 431 }
 432
 433 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
 434 {
 435         if (gpio_is_valid(pdata->slots[0].gpio_wp))
 436                 gpio_free(pdata->slots[0].gpio_wp);
 437         if (gpio_is_valid(pdata->slots[0].switch_pin))
 438                 gpio_free(pdata->slots[0].switch_pin);
 439 }
 440
 441 /*
 442  * Start clock to the card
 443  */
 444 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
 445 {
 446         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 447                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 448 }
 449
 450 /*
 451  * Stop clock to the card
 452  */
 453 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
 454 {
 455         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 456                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 457         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 458                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
 459 }
 460
 461 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
 462                                   struct mmc_command *cmd)
 463 {
 464         unsigned int irq_mask;
 465
 466         if (host->use_dma)
 467                 irq_mask = INT_EN_MASK & ~(BRR_EN | BWR_EN);
 468         else
 469                 irq_mask = INT_EN_MASK;
 470
 471         /* Disable timeout for erases */
 472         if (cmd->opcode == MMC_ERASE)
 473                 irq_mask &= ~DTO_EN;
 474
 475         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 476         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
 477         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 478 }
 479
 480 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
 481 {
 482         OMAP_HSMMC_WRITE(host->base, ISE, 0);
 483         OMAP_HSMMC_WRITE(host->base, IE, 0);
 484         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 485 }
 486
 487 /* Calculate divisor for the given clock frequency */
 488 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
 489 {
 490         u16 dsor = 0;
 491
 492         if (ios->clock) {
 493                 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
 494                 if (dsor > 250)
 495                         dsor = 250;
 496         }
 497
 498         return dsor;
 499 }
 500
 501 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
 502 {
 503         struct mmc_ios *ios = &host->mmc->ios;
 504         unsigned long regval;
 505         unsigned long timeout;
 506         unsigned long clkdiv;
 507
 508         dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
 509
 510         omap_hsmmc_stop_clock(host);
 511
 512         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 513         regval = regval & ~(CLKD_MASK | DTO_MASK);
 514         clkdiv = calc_divisor(host, ios);
 515         regval = regval | (clkdiv << 6) | (DTO << 16);
 516         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 517         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 518                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 519
 520         /* Wait till the ICS bit is set */
 521         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 522         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
 523                 && time_before(jiffies, timeout))
 524                 cpu_relax();
 525
 526         /*
 527          * Enable High-Speed Support
 528          * Pre-Requisites
 529          *      - Controller should support High-Speed-Enable Bit
 530          *      - Controller should not be using DDR Mode
 531          *      - Controller should advertise that it supports High Speed
 532          *        in capabilities register
 533          *      - MMC/SD clock coming out of controller > 25MHz
 534          */
 535         if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) &&
 536             (ios->timing != MMC_TIMING_UHS_DDR50) &&
 537             ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
 538                 regval = OMAP_HSMMC_READ(host->base, HCTL);
 539                 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
 540                         regval |= HSPE;
 541                 else
 542                         regval &= ~HSPE;
 543
 544                 OMAP_HSMMC_WRITE(host->base, HCTL, regval);
 545         }
 546
 547         omap_hsmmc_start_clock(host);
 548 }
 549
 550 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
 551 {
 552         struct mmc_ios *ios = &host->mmc->ios;
 553         u32 con;
 554
 555         con = OMAP_HSMMC_READ(host->base, CON);
 556         if (ios->timing == MMC_TIMING_UHS_DDR50)
 557                 con |= DDR;     /* configure in DDR mode */
 558         else
 559                 con &= ~DDR;
 560         switch (ios->bus_width) {
 561         case MMC_BUS_WIDTH_8:
 562                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
 563                 break;
 564         case MMC_BUS_WIDTH_4:
 565                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 566                 OMAP_HSMMC_WRITE(host->base, HCTL,
 567                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 568                 break;
 569         case MMC_BUS_WIDTH_1:
 570                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 571                 OMAP_HSMMC_WRITE(host->base, HCTL,
 572                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 573                 break;
 574         }
 575 }
 576
 577 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
 578 {
 579         struct mmc_ios *ios = &host->mmc->ios;
 580         u32 con;
 581
 582         con = OMAP_HSMMC_READ(host->base, CON);
 583         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 584                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
 585         else
 586                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
 587 }
 588
 589 #ifdef CONFIG_PM
 590
 591 /*
 592  * Restore the MMC host context, if it was lost as result of a
 593  * power state change.
 594  */
 595 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 596 {
 597         struct mmc_ios *ios = &host->mmc->ios;
 598         struct omap_mmc_platform_data *pdata = host->pdata;
 599         int context_loss = 0;
 600         u32 hctl, capa;
 601         unsigned long timeout;
 602
 603         if (pdata->get_context_loss_count) {
 604                 context_loss = pdata->get_context_loss_count(host->dev);
 605                 if (context_loss < 0)
 606                         return 1;
 607         }
 608
 609         dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
 610                 context_loss == host->context_loss ? "not " : "");
 611         if (host->context_loss == context_loss)
 612                 return 1;
 613
 614         if (!OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE)
 615                 return 1;
 616
 617         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
 618                 if (host->power_mode != MMC_POWER_OFF &&
 619                     (1 << ios->vdd) <= MMC_VDD_23_24)
 620                         hctl = SDVS18;
 621                 else
 622                         hctl = SDVS30;
 623                 capa = VS30 | VS18;
 624         } else {
 625                 hctl = SDVS18;
 626                 capa = VS18;
 627         }
 628
 629         OMAP_HSMMC_WRITE(host->base, HCTL,
 630                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
 631
 632         OMAP_HSMMC_WRITE(host->base, CAPA,
 633                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
 634
 635         OMAP_HSMMC_WRITE(host->base, HCTL,
 636                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 637
 638         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 639         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
 640                 && time_before(jiffies, timeout))
 641                 ;
 642
 643         omap_hsmmc_disable_irq(host);
 644
 645         /* Do not initialize card-specific things if the power is off */
 646         if (host->power_mode == MMC_POWER_OFF)
 647                 goto out;
 648
 649         omap_hsmmc_set_bus_width(host);
 650
 651         omap_hsmmc_set_clock(host);
 652
 653         omap_hsmmc_set_bus_mode(host);
 654
 655 out:
 656         host->context_loss = context_loss;
 657
 658         dev_dbg(mmc_dev(host->mmc), "context is restored\n");
 659         return 0;
 660 }
 661
 662 /*
 663  * Save the MMC host context (store the number of power state changes so far).
 664  */
 665 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 666 {
 667         struct omap_mmc_platform_data *pdata = host->pdata;
 668         int context_loss;
 669
 670         if (pdata->get_context_loss_count) {
 671                 context_loss = pdata->get_context_loss_count(host->dev);
 672                 if (context_loss < 0)
 673                         return;
 674                 host->context_loss = context_loss;
 675         }
 676 }
 677
 678 #else
 679
 680 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 681 {
 682         return 0;
 683 }
 684
 685 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 686 {
 687 }
 688
 689 #endif
 690
 691 /*
 692  * Send init stream sequence to card
 693  * before sending IDLE command
 694  */
 695 static void send_init_stream(struct omap_hsmmc_host *host)
 696 {
 697         int reg = 0;
 698         unsigned long timeout;
 699
 700         if (host->protect_card)
 701                 return;
 702
 703         disable_irq(host->irq);
 704
 705         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 706         OMAP_HSMMC_WRITE(host->base, CON,
 707                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 708         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 709
 710         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 711         while ((reg != CC_EN) && time_before(jiffies, timeout))
 712                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
 713
 714         OMAP_HSMMC_WRITE(host->base, CON,
 715                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 716
 717         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 718         OMAP_HSMMC_READ(host->base, STAT);
 719
 720         enable_irq(host->irq);
 721 }
 722
 723 static inline
 724 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
 725 {
 726         int r = 1;
 727
 728         if (mmc_slot(host).get_cover_state)
 729                 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
 730         return r;
 731 }
 732
 733 static ssize_t
 734 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
 735                            char *buf)
 736 {
 737         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 738         struct omap_hsmmc_host *host = mmc_priv(mmc);
 739
 740         return sprintf(buf, "%s\n",
 741                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
 742 }
 743
 744 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
 745
 746 static ssize_t
 747 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
 748                         char *buf)
 749 {
 750         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 751         struct omap_hsmmc_host *host = mmc_priv(mmc);
 752
 753         return sprintf(buf, "%s\n", mmc_slot(host).name);
 754 }
 755
 756 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
 757
 758 /*
 759  * Configure the response type and send the cmd.
 760  */
 761 static void
 762 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
 763         struct mmc_data *data)
 764 {
 765         int cmdreg = 0, resptype = 0, cmdtype = 0;
 766
 767         dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 768                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 769         host->cmd = cmd;
 770
 771         omap_hsmmc_enable_irq(host, cmd);
 772
 773         host->response_busy = 0;
 774         if (cmd->flags & MMC_RSP_PRESENT) {
 775                 if (cmd->flags & MMC_RSP_136)
 776                         resptype = 1;
 777                 else if (cmd->flags & MMC_RSP_BUSY) {
 778                         resptype = 3;
 779                         host->response_busy = 1;
 780                 } else
 781                         resptype = 2;
 782         }
 783
 784         /*
 785          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 786          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 787          * a val of 0x3, rest 0x0.
 788          */
 789         if (cmd == host->mrq->stop)
 790                 cmdtype = 0x3;
 791
 792         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 793
 794         if (data) {
 795                 cmdreg |= DP_SELECT | MSBS | BCE;
 796                 if (data->flags & MMC_DATA_READ)
 797                         cmdreg |= DDIR;
 798                 else
 799                         cmdreg &= ~(DDIR);
 800         }
 801
 802         if (host->use_dma)
 803                 cmdreg |= DMAE;
 804
 805         host->req_in_progress = 1;
 806
 807         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 808         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 809 }
 810
 811 static int
 812 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
 813 {
 814         if (data->flags & MMC_DATA_WRITE)
 815                 return DMA_TO_DEVICE;
 816         else
 817                 return DMA_FROM_DEVICE;
 818 }
 819
 820 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
 821         struct mmc_data *data)
 822 {
 823         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
 824 }
 825
 826 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
 827 {
 828         int dma_ch;
 829         unsigned long flags;
 830
 831         spin_lock_irqsave(&host->irq_lock, flags);
 832         host->req_in_progress = 0;
 833         dma_ch = host->dma_ch;
 834         spin_unlock_irqrestore(&host->irq_lock, flags);
 835
 836         omap_hsmmc_disable_irq(host);
 837         /* Do not complete the request if DMA is still in progress */
 838         if (mrq->data && host->use_dma && dma_ch != -1)
 839                 return;
 840         host->mrq = NULL;
 841         mmc_request_done(host->mmc, mrq);
 842 }
 843
 844 /*
 845  * Notify the transfer complete to MMC core
 846  */
 847 static void
 848 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
 849 {
 850         if (!data) {
 851                 struct mmc_request *mrq = host->mrq;
 852
 853                 /* TC before CC from CMD6 - don't know why, but it happens */
 854                 if (host->cmd && host->cmd->opcode == 6 &&
 855                     host->response_busy) {
 856                         host->response_busy = 0;
 857                         return;
 858                 }
 859
 860                 omap_hsmmc_request_done(host, mrq);
 861                 return;
 862         }
 863
 864         host->data = NULL;
 865
 866         if (!data->error)
 867                 data->bytes_xfered += data->blocks * (data->blksz);
 868         else
 869                 data->bytes_xfered = 0;
 870
 871         if (!data->stop) {
 872                 omap_hsmmc_request_done(host, data->mrq);
 873                 return;
 874         }
 875         omap_hsmmc_start_command(host, data->stop, NULL);
 876 }
 877
 878 /*
 879  * Notify the core about command completion
 880  */
 881 static void
 882 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
 883 {
 884         host->cmd = NULL;
 885
 886         if (cmd->flags & MMC_RSP_PRESENT) {
 887                 if (cmd->flags & MMC_RSP_136) {
 888                         /* response type 2 */
 889                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
 890                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
 891                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
 892                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
 893                 } else {
 894                         /* response types 1, 1b, 3, 4, 5, 6 */
 895                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
 896                 }
 897         }
 898         if ((host->data == NULL && !host->response_busy) || cmd->error)
 899                 omap_hsmmc_request_done(host, cmd->mrq);
 900 }
 901
 902 /*
 903  * DMA clean up for command errors
 904  */
 905 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
 906 {
 907         int dma_ch;
 908         unsigned long flags;
 909
 910         host->data->error = errno;
 911
 912         spin_lock_irqsave(&host->irq_lock, flags);
 913         dma_ch = host->dma_ch;
 914         host->dma_ch = -1;
 915         spin_unlock_irqrestore(&host->irq_lock, flags);
 916
 917         if (host->use_dma && dma_ch != -1) {
 918                 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
 919
 920                 dmaengine_terminate_all(chan);
 921                 dma_unmap_sg(chan->device->dev,
 922                         host->data->sg, host->data->sg_len,
 923                         omap_hsmmc_get_dma_dir(host, host->data));
 924
 925                 host->data->host_cookie = 0;
 926         }
 927         host->data = NULL;
 928 }
 929
 930 /*
 931  * Readable error output
 932  */
 933 #ifdef CONFIG_MMC_DEBUG
 934 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
 935 {
 936         /* --- means reserved bit without definition at documentation */
 937         static const char *omap_hsmmc_status_bits[] = {
 938                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
 939                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
 940                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
 941                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
 942         };
 943         char res[256];
 944         char *buf = res;
 945         int len, i;
 946
 947         len = sprintf(buf, "MMC IRQ 0x%x :", status);
 948         buf += len;
 949
 950         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
 951                 if (status & (1 << i)) {
 952                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
 953                         buf += len;
 954                 }
 955
 956         dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
 957 }
 958 #else
 959 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
 960                                              u32 status)
 961 {
 962 }
 963 #endif  /* CONFIG_MMC_DEBUG */
 964
 965 /*
 966  * MMC controller internal state machines reset
 967  *
 968  * Used to reset command or data internal state machines, using respectively
 969  *  SRC or SRD bit of SYSCTL register
 970  * Can be called from interrupt context
 971  */
 972 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
 973                                                    unsigned long bit)
 974 {
 975         unsigned long i = 0;
 976         unsigned long limit = (loops_per_jiffy *
 977                                 msecs_to_jiffies(MMC_TIMEOUT_MS));
 978
 979         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 980                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
 981
 982         /*
 983          * OMAP4 ES2 and greater has an updated reset logic.
 984          * Monitor a 0->1 transition first
 985          */
 986         if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
 987                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
 988                                         && (i++ < limit))
 989                         cpu_relax();
 990         }
 991         i = 0;
 992
 993         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
 994                 (i++ < limit))
 995                 cpu_relax();
 996
 997         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
 998                 dev_err(mmc_dev(host->mmc),
 999                         "Timeout waiting on controller reset in %s\n",
1000                         __func__);
1001 }
1002
1003 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
1004                                         int err, int end_cmd)
1005 {
1006         if (end_cmd) {
1007                 omap_hsmmc_reset_controller_fsm(host, SRC);
1008                 if (host->cmd)
1009                         host->cmd->error = err;
1010         }
1011
1012         if (host->data) {
1013                 omap_hsmmc_reset_controller_fsm(host, SRD);
1014                 omap_hsmmc_dma_cleanup(host, err);
1015         } else if (host->mrq && host->mrq->cmd)
1016                 host->mrq->cmd->error = err;
1017 }
1018
1019 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1020 {
1021         struct mmc_data *data;
1022         int end_cmd = 0, end_trans = 0;
1023
1024         data = host->data;
1025         dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1026
1027         if (status & ERR_EN) {
1028                 omap_hsmmc_dbg_report_irq(host, status);
1029
1030                 if (status & (CTO_EN | CCRC_EN))
1031                         end_cmd = 1;
1032                 if (status & (CTO_EN | DTO_EN))
1033                         hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
1034                 else if (status & (CCRC_EN | DCRC_EN))
1035                         hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
1036
1037                 if (host->data || host->response_busy) {
1038                         end_trans = !end_cmd;
1039                         host->response_busy = 0;
1040                 }
1041         }
1042
1043         if (end_cmd || ((status & CC_EN) && host->cmd))
1044                 omap_hsmmc_cmd_done(host, host->cmd);
1045         if ((end_trans || (status & TC_EN)) && host->mrq)
1046                 omap_hsmmc_xfer_done(host, data);
1047 }
1048
1049 /*
1050  * MMC controller IRQ handler
1051  */
1052 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1053 {
1054         struct omap_hsmmc_host *host = dev_id;
1055         int status;
1056
1057         status = OMAP_HSMMC_READ(host->base, STAT);
1058         while (status & INT_EN_MASK && host->req_in_progress) {
1059                 omap_hsmmc_do_irq(host, status);
1060
1061                 /* Flush posted write */
1062                 OMAP_HSMMC_WRITE(host->base, STAT, status);
1063                 status = OMAP_HSMMC_READ(host->base, STAT);
1064         }
1065
1066         return IRQ_HANDLED;
1067 }
1068
1069 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1070 {
1071         unsigned long i;
1072
1073         OMAP_HSMMC_WRITE(host->base, HCTL,
1074                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1075         for (i = 0; i < loops_per_jiffy; i++) {
1076                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1077                         break;
1078                 cpu_relax();
1079         }
1080 }
1081
1082 /*
1083  * Switch MMC interface voltage ... only relevant for MMC1.
1084  *
1085  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1086  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1087  * Some chips, like eMMC ones, use internal transceivers.
1088  */
1089 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1090 {
1091         u32 reg_val = 0;
1092         int ret;
1093
1094         /* Disable the clocks */
1095         pm_runtime_put_sync(host->dev);
1096         if (host->dbclk)
1097                 clk_disable_unprepare(host->dbclk);
1098
1099         /* Turn the power off */
1100         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1101
1102         /* Turn the power ON with given VDD 1.8 or 3.0v */
1103         if (!ret)
1104                 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1105                                                vdd);
1106         pm_runtime_get_sync(host->dev);
1107         if (host->dbclk)
1108                 clk_prepare_enable(host->dbclk);
1109
1110         if (ret != 0)
1111                 goto err;
1112
1113         OMAP_HSMMC_WRITE(host->base, HCTL,
1114                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1115         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1116
1117         /*
1118          * If a MMC dual voltage card is detected, the set_ios fn calls
1119          * this fn with VDD bit set for 1.8V. Upon card removal from the
1120          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1121          *
1122          * Cope with a bit of slop in the range ... per data sheets:
1123          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1124          *    but recommended values are 1.71V to 1.89V
1125          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1126          *    but recommended values are 2.7V to 3.3V
1127          *
1128          * Board setup code shouldn't permit anything very out-of-range.
1129          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1130          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1131          */
1132         if ((1 << vdd) <= MMC_VDD_23_24)
1133                 reg_val |= SDVS18;
1134         else
1135                 reg_val |= SDVS30;
1136
1137         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1138         set_sd_bus_power(host);
1139
1140         return 0;
1141 err:
1142         dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1143         return ret;
1144 }
1145
1146 /* Protect the card while the cover is open */
1147 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1148 {
1149         if (!mmc_slot(host).get_cover_state)
1150                 return;
1151
1152         host->reqs_blocked = 0;
1153         if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1154                 if (host->protect_card) {
1155                         dev_info(host->dev, "%s: cover is closed, "
1156                                          "card is now accessible\n",
1157                                          mmc_hostname(host->mmc));
1158                         host->protect_card = 0;
1159                 }
1160         } else {
1161                 if (!host->protect_card) {
1162                         dev_info(host->dev, "%s: cover is open, "
1163                                          "card is now inaccessible\n",
1164                                          mmc_hostname(host->mmc));
1165                         host->protect_card = 1;
1166                 }
1167         }
1168 }
1169
1170 /*
1171  * irq handler to notify the core about card insertion/removal
1172  */
1173 static irqreturn_t omap_hsmmc_detect(int irq, void *dev_id)
1174 {
1175         struct omap_hsmmc_host *host = dev_id;
1176         struct omap_mmc_slot_data *slot = &mmc_slot(host);
1177         int carddetect;
1178
1179         if (host->suspended)
1180                 return IRQ_HANDLED;
1181
1182         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1183
1184         if (slot->card_detect)
1185                 carddetect = slot->card_detect(host->dev, host->slot_id);
1186         else {
1187                 omap_hsmmc_protect_card(host);
1188                 carddetect = -ENOSYS;
1189         }
1190
1191         if (carddetect)
1192                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1193         else
1194                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1195         return IRQ_HANDLED;
1196 }
1197
1198 static void omap_hsmmc_dma_callback(void *param)
1199 {
1200         struct omap_hsmmc_host *host = param;
1201         struct dma_chan *chan;
1202         struct mmc_data *data;
1203         int req_in_progress;
1204
1205         spin_lock_irq(&host->irq_lock);
1206         if (host->dma_ch < 0) {
1207                 spin_unlock_irq(&host->irq_lock);
1208                 return;
1209         }
1210
1211         data = host->mrq->data;
1212         chan = omap_hsmmc_get_dma_chan(host, data);
1213         if (!data->host_cookie)
1214                 dma_unmap_sg(chan->device->dev,
1215                              data->sg, data->sg_len,
1216                              omap_hsmmc_get_dma_dir(host, data));
1217
1218         req_in_progress = host->req_in_progress;
1219         host->dma_ch = -1;
1220         spin_unlock_irq(&host->irq_lock);
1221
1222         /* If DMA has finished after TC, complete the request */
1223         if (!req_in_progress) {
1224                 struct mmc_request *mrq = host->mrq;
1225
1226                 host->mrq = NULL;
1227                 mmc_request_done(host->mmc, mrq);
1228         }
1229 }
1230
1231 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1232                                        struct mmc_data *data,
1233                                        struct omap_hsmmc_next *next,
1234                                        struct dma_chan *chan)
1235 {
1236         int dma_len;
1237
1238         if (!next && data->host_cookie &&
1239             data->host_cookie != host->next_data.cookie) {
1240                 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1241                        " host->next_data.cookie %d\n",
1242                        __func__, data->host_cookie, host->next_data.cookie);
1243                 data->host_cookie = 0;
1244         }
1245
1246         /* Check if next job is already prepared */
1247         if (next ||
1248             (!next && data->host_cookie != host->next_data.cookie)) {
1249                 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
1250                                      omap_hsmmc_get_dma_dir(host, data));
1251
1252         } else {
1253                 dma_len = host->next_data.dma_len;
1254                 host->next_data.dma_len = 0;
1255         }
1256
1257
1258         if (dma_len == 0)
1259                 return -EINVAL;
1260
1261         if (next) {
1262                 next->dma_len = dma_len;
1263                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1264         } else
1265                 host->dma_len = dma_len;
1266
1267         return 0;
1268 }
1269
1270 /*
1271  * Routine to configure and start DMA for the MMC card
1272  */
1273 static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
1274                                         struct mmc_request *req)
1275 {
1276         struct dma_slave_config cfg;
1277         struct dma_async_tx_descriptor *tx;
1278         int ret = 0, i;
1279         struct mmc_data *data = req->data;
1280         struct dma_chan *chan;
1281
1282         /* Sanity check: all the SG entries must be aligned by block size. */
1283         for (i = 0; i < data->sg_len; i++) {
1284                 struct scatterlist *sgl;
1285
1286                 sgl = data->sg + i;
1287                 if (sgl->length % data->blksz)
1288                         return -EINVAL;
1289         }
1290         if ((data->blksz % 4) != 0)
1291                 /* REVISIT: The MMC buffer increments only when MSB is written.
1292                  * Return error for blksz which is non multiple of four.
1293                  */
1294                 return -EINVAL;
1295
1296         BUG_ON(host->dma_ch != -1);
1297
1298         chan = omap_hsmmc_get_dma_chan(host, data);
1299
1300         cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
1301         cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
1302         cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1303         cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1304         cfg.src_maxburst = data->blksz / 4;
1305         cfg.dst_maxburst = data->blksz / 4;
1306
1307         ret = dmaengine_slave_config(chan, &cfg);
1308         if (ret)
1309                 return ret;
1310
1311         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
1312         if (ret)
1313                 return ret;
1314
1315         tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
1316                 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1317                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1318         if (!tx) {
1319                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
1320                 /* FIXME: cleanup */
1321                 return -1;
1322         }
1323
1324         tx->callback = omap_hsmmc_dma_callback;
1325         tx->callback_param = host;
1326
1327         /* Does not fail */
1328         dmaengine_submit(tx);
1329
1330         host->dma_ch = 1;
1331
1332         dma_async_issue_pending(chan);
1333
1334         return 0;
1335 }
1336
1337 static void set_data_timeout(struct omap_hsmmc_host *host,
1338                              unsigned int timeout_ns,
1339                              unsigned int timeout_clks)
1340 {
1341         unsigned int timeout, cycle_ns;
1342         uint32_t reg, clkd, dto = 0;
1343
1344         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1345         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1346         if (clkd == 0)
1347                 clkd = 1;
1348
1349         cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
1350         timeout = timeout_ns / cycle_ns;
1351         timeout += timeout_clks;
1352         if (timeout) {
1353                 while ((timeout & 0x80000000) == 0) {
1354                         dto += 1;
1355                         timeout <<= 1;
1356                 }
1357                 dto = 31 - dto;
1358                 timeout <<= 1;
1359                 if (timeout && dto)
1360                         dto += 1;
1361                 if (dto >= 13)
1362                         dto -= 13;
1363                 else
1364                         dto = 0;
1365                 if (dto > 14)
1366                         dto = 14;
1367         }
1368
1369         reg &= ~DTO_MASK;
1370         reg |= dto << DTO_SHIFT;
1371         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1372 }
1373
1374 /*
1375  * Configure block length for MMC/SD cards and initiate the transfer.
1376  */
1377 static int
1378 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1379 {
1380         int ret;
1381         host->data = req->data;
1382
1383         if (req->data == NULL) {
1384                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1385                 /*
1386                  * Set an arbitrary 100ms data timeout for commands with
1387                  * busy signal.
1388                  */
1389                 if (req->cmd->flags & MMC_RSP_BUSY)
1390                         set_data_timeout(host, 100000000U, 0);
1391                 return 0;
1392         }
1393
1394         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1395                                         | (req->data->blocks << 16));
1396         set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
1397
1398         if (host->use_dma) {
1399                 ret = omap_hsmmc_start_dma_transfer(host, req);
1400                 if (ret != 0) {
1401                         dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
1402                         return ret;
1403                 }
1404         }
1405         return 0;
1406 }
1407
1408 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1409                                 int err)
1410 {
1411         struct omap_hsmmc_host *host = mmc_priv(mmc);
1412         struct mmc_data *data = mrq->data;
1413
1414         if (host->use_dma && data->host_cookie) {
1415                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
1416
1417                 dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
1418                              omap_hsmmc_get_dma_dir(host, data));
1419                 data->host_cookie = 0;
1420         }
1421 }
1422
1423 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1424                                bool is_first_req)
1425 {
1426         struct omap_hsmmc_host *host = mmc_priv(mmc);
1427
1428         if (mrq->data->host_cookie) {
1429                 mrq->data->host_cookie = 0;
1430                 return ;
1431         }
1432
1433         if (host->use_dma) {
1434                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
1435
1436                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1437                                                 &host->next_data, c))
1438                         mrq->data->host_cookie = 0;
1439         }
1440 }
1441
1442 /*
1443  * Request function. for read/write operation
1444  */
1445 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1446 {
1447         struct omap_hsmmc_host *host = mmc_priv(mmc);
1448         int err;
1449
1450         BUG_ON(host->req_in_progress);
1451         BUG_ON(host->dma_ch != -1);
1452         if (host->protect_card) {
1453                 if (host->reqs_blocked < 3) {
1454                         /*
1455                          * Ensure the controller is left in a consistent
1456                          * state by resetting the command and data state
1457                          * machines.
1458                          */
1459                         omap_hsmmc_reset_controller_fsm(host, SRD);
1460                         omap_hsmmc_reset_controller_fsm(host, SRC);
1461                         host->reqs_blocked += 1;
1462                 }
1463                 req->cmd->error = -EBADF;
1464                 if (req->data)
1465                         req->data->error = -EBADF;
1466                 req->cmd->retries = 0;
1467                 mmc_request_done(mmc, req);
1468                 return;
1469         } else if (host->reqs_blocked)
1470                 host->reqs_blocked = 0;
1471         WARN_ON(host->mrq != NULL);
1472         host->mrq = req;
1473         err = omap_hsmmc_prepare_data(host, req);
1474         if (err) {
1475                 req->cmd->error = err;
1476                 if (req->data)
1477                         req->data->error = err;
1478                 host->mrq = NULL;
1479                 mmc_request_done(mmc, req);
1480                 return;
1481         }
1482
1483         omap_hsmmc_start_command(host, req->cmd, req->data);
1484 }
1485
1486 /* Routine to configure clock values. Exposed API to core */
1487 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1488 {
1489         struct omap_hsmmc_host *host = mmc_priv(mmc);
1490         int do_send_init_stream = 0;
1491
1492         pm_runtime_get_sync(host->dev);
1493
1494         if (ios->power_mode != host->power_mode) {
1495                 switch (ios->power_mode) {
1496                 case MMC_POWER_OFF:
1497                         mmc_slot(host).set_power(host->dev, host->slot_id,
1498                                                  0, 0);
1499                         break;
1500                 case MMC_POWER_UP:
1501                         mmc_slot(host).set_power(host->dev, host->slot_id,
1502                                                  1, ios->vdd);
1503                         break;
1504                 case MMC_POWER_ON:
1505                         do_send_init_stream = 1;
1506                         break;
1507                 }
1508                 host->power_mode = ios->power_mode;
1509         }
1510
1511         /* FIXME: set registers based only on changes to ios */
1512
1513         omap_hsmmc_set_bus_width(host);
1514
1515         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1516                 /* Only MMC1 can interface at 3V without some flavor
1517                  * of external transceiver; but they all handle 1.8V.
1518                  */
1519                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1520                         (ios->vdd == DUAL_VOLT_OCR_BIT) &&
1521                         /*
1522                          * With pbias cell programming missing, this
1523                          * can't be allowed when booting with device
1524                          * tree.
1525                          */
1526                         !host->dev->of_node) {
1527                                 /*
1528                                  * The mmc_select_voltage fn of the core does
1529                                  * not seem to set the power_mode to
1530                                  * MMC_POWER_UP upon recalculating the voltage.
1531                                  * vdd 1.8v.
1532                                  */
1533                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1534                                 dev_dbg(mmc_dev(host->mmc),
1535                                                 "Switch operation failed\n");
1536                 }
1537         }
1538
1539         omap_hsmmc_set_clock(host);
1540
1541         if (do_send_init_stream)
1542                 send_init_stream(host);
1543
1544         omap_hsmmc_set_bus_mode(host);
1545
1546         pm_runtime_put_autosuspend(host->dev);
1547 }
1548
1549 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1550 {
1551         struct omap_hsmmc_host *host = mmc_priv(mmc);
1552
1553         if (!mmc_slot(host).card_detect)
1554                 return -ENOSYS;
1555         return mmc_slot(host).card_detect(host->dev, host->slot_id);
1556 }
1557
1558 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1559 {
1560         struct omap_hsmmc_host *host = mmc_priv(mmc);
1561
1562         if (!mmc_slot(host).get_ro)
1563                 return -ENOSYS;
1564         return mmc_slot(host).get_ro(host->dev, 0);
1565 }
1566
1567 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1568 {
1569         struct omap_hsmmc_host *host = mmc_priv(mmc);
1570
1571         if (mmc_slot(host).init_card)
1572                 mmc_slot(host).init_card(card);
1573 }
1574
1575 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1576 {
1577         u32 hctl, capa, value;
1578
1579         /* Only MMC1 supports 3.0V */
1580         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1581                 hctl = SDVS30;
1582                 capa = VS30 | VS18;
1583         } else {
1584                 hctl = SDVS18;
1585                 capa = VS18;
1586         }
1587
1588         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1589         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1590
1591         value = OMAP_HSMMC_READ(host->base, CAPA);
1592         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1593
1594         /* Set SD bus power bit */
1595         set_sd_bus_power(host);
1596 }
1597
1598 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1599 {
1600         struct omap_hsmmc_host *host = mmc_priv(mmc);
1601
1602         pm_runtime_get_sync(host->dev);
1603
1604         return 0;
1605 }
1606
1607 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc)
1608 {
1609         struct omap_hsmmc_host *host = mmc_priv(mmc);
1610
1611         pm_runtime_mark_last_busy(host->dev);
1612         pm_runtime_put_autosuspend(host->dev);
1613
1614         return 0;
1615 }
1616
1617 static const struct mmc_host_ops omap_hsmmc_ops = {
1618         .enable = omap_hsmmc_enable_fclk,
1619         .disable = omap_hsmmc_disable_fclk,
1620         .post_req = omap_hsmmc_post_req,
1621         .pre_req = omap_hsmmc_pre_req,
1622         .request = omap_hsmmc_request,
1623         .set_ios = omap_hsmmc_set_ios,
1624         .get_cd = omap_hsmmc_get_cd,
1625         .get_ro = omap_hsmmc_get_ro,
1626         .init_card = omap_hsmmc_init_card,
1627         /* NYET -- enable_sdio_irq */
1628 };
1629
1630 #ifdef CONFIG_DEBUG_FS
1631
1632 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1633 {
1634         struct mmc_host *mmc = s->private;
1635         struct omap_hsmmc_host *host = mmc_priv(mmc);
1636         int context_loss = 0;
1637
1638         if (host->pdata->get_context_loss_count)
1639                 context_loss = host->pdata->get_context_loss_count(host->dev);
1640
1641         seq_printf(s, "mmc%d:\n ctx_loss:\t%d:%d\n\nregs:\n",
1642                         mmc->index, host->context_loss, context_loss);
1643
1644         if (host->suspended) {
1645                 seq_printf(s, "host suspended, can't read registers\n");
1646                 return 0;
1647         }
1648
1649         pm_runtime_get_sync(host->dev);
1650
1651         seq_printf(s, "CON:\t\t0x%08x\n",
1652                         OMAP_HSMMC_READ(host->base, CON));
1653         seq_printf(s, "HCTL:\t\t0x%08x\n",
1654                         OMAP_HSMMC_READ(host->base, HCTL));
1655         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1656                         OMAP_HSMMC_READ(host->base, SYSCTL));
1657         seq_printf(s, "IE:\t\t0x%08x\n",
1658                         OMAP_HSMMC_READ(host->base, IE));
1659         seq_printf(s, "ISE:\t\t0x%08x\n",
1660                         OMAP_HSMMC_READ(host->base, ISE));
1661         seq_printf(s, "CAPA:\t\t0x%08x\n",
1662                         OMAP_HSMMC_READ(host->base, CAPA));
1663
1664         pm_runtime_mark_last_busy(host->dev);
1665         pm_runtime_put_autosuspend(host->dev);
1666
1667         return 0;
1668 }
1669
1670 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1671 {
1672         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1673 }
1674
1675 static const struct file_operations mmc_regs_fops = {
1676         .open           = omap_hsmmc_regs_open,
1677         .read           = seq_read,
1678         .llseek         = seq_lseek,
1679         .release        = single_release,
1680 };
1681
1682 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1683 {
1684         if (mmc->debugfs_root)
1685                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1686                         mmc, &mmc_regs_fops);
1687 }
1688
1689 #else
1690
1691 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1692 {
1693 }
1694
1695 #endif
1696
1697 #ifdef CONFIG_OF
1698 static u16 omap4_reg_offset = 0x100;
1699
1700 static const struct of_device_id omap_mmc_of_match[] = {
1701         {
1702                 .compatible = "ti,omap2-hsmmc",
1703         },
1704         {
1705                 .compatible = "ti,omap3-hsmmc",
1706         },
1707         {
1708                 .compatible = "ti,omap4-hsmmc",
1709                 .data = &omap4_reg_offset,
1710         },
1711         {},
1712 };
1713 MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1714
1715 static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1716 {
1717         struct omap_mmc_platform_data *pdata;
1718         struct device_node *np = dev->of_node;
1719         u32 bus_width, max_freq;
1720
1721         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1722         if (!pdata)
1723                 return NULL; /* out of memory */
1724
1725         if (of_find_property(np, "ti,dual-volt", NULL))
1726                 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1727
1728         /* This driver only supports 1 slot */
1729         pdata->nr_slots = 1;
1730         pdata->slots[0].switch_pin = of_get_named_gpio(np, "cd-gpios", 0);
1731         pdata->slots[0].gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
1732
1733         if (of_find_property(np, "ti,non-removable", NULL)) {
1734                 pdata->slots[0].nonremovable = true;
1735                 pdata->slots[0].no_regulator_off_init = true;
1736         }
1737         of_property_read_u32(np, "bus-width", &bus_width);
1738         if (bus_width == 4)
1739                 pdata->slots[0].caps |= MMC_CAP_4_BIT_DATA;
1740         else if (bus_width == 8)
1741                 pdata->slots[0].caps |= MMC_CAP_8_BIT_DATA;
1742
1743         if (of_find_property(np, "ti,needs-special-reset", NULL))
1744                 pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
1745
1746         if (!of_property_read_u32(np, "max-frequency", &max_freq))
1747                 pdata->max_freq = max_freq;
1748
1749         if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
1750                 pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT;
1751
1752         return pdata;
1753 }
1754 #else
1755 static inline struct omap_mmc_platform_data
1756                         *of_get_hsmmc_pdata(struct device *dev)
1757 {
1758         return NULL;
1759 }
1760 #endif
1761
1762 static int omap_hsmmc_probe(struct platform_device *pdev)
1763 {
1764         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1765         struct mmc_host *mmc;
1766         struct omap_hsmmc_host *host = NULL;
1767         struct resource *res;
1768         int ret, irq;
1769         const struct of_device_id *match;
1770         dma_cap_mask_t mask;
1771         unsigned tx_req, rx_req;
1772         struct pinctrl *pinctrl;
1773
1774         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
1775         if (match) {
1776                 pdata = of_get_hsmmc_pdata(&pdev->dev);
1777                 if (match->data) {
1778                         const u16 *offsetp = match->data;
1779                         pdata->reg_offset = *offsetp;
1780                 }
1781         }
1782
1783         if (pdata == NULL) {
1784                 dev_err(&pdev->dev, "Platform Data is missing\n");
1785                 return -ENXIO;
1786         }
1787
1788         if (pdata->nr_slots == 0) {
1789                 dev_err(&pdev->dev, "No Slots\n");
1790                 return -ENXIO;
1791         }
1792
1793         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1794         irq = platform_get_irq(pdev, 0);
1795         if (res == NULL || irq < 0)
1796                 return -ENXIO;
1797
1798         res = request_mem_region(res->start, resource_size(res), pdev->name);
1799         if (res == NULL)
1800                 return -EBUSY;
1801
1802         ret = omap_hsmmc_gpio_init(pdata);
1803         if (ret)
1804                 goto err;
1805
1806         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1807         if (!mmc) {
1808                 ret = -ENOMEM;
1809                 goto err_alloc;
1810         }
1811
1812         host            = mmc_priv(mmc);
1813         host->mmc       = mmc;
1814         host->pdata     = pdata;
1815         host->dev       = &pdev->dev;
1816         host->use_dma   = 1;
1817         host->dma_ch    = -1;
1818         host->irq       = irq;
1819         host->slot_id   = 0;
1820         host->mapbase   = res->start + pdata->reg_offset;
1821         host->base      = ioremap(host->mapbase, SZ_4K);
1822         host->power_mode = MMC_POWER_OFF;
1823         host->next_data.cookie = 1;
1824
1825         platform_set_drvdata(pdev, host);
1826
1827         mmc->ops        = &omap_hsmmc_ops;
1828
1829         /*
1830          * If regulator_disable can only put vcc_aux to sleep then there is
1831          * no off state.
1832          */
1833         if (mmc_slot(host).vcc_aux_disable_is_sleep)
1834                 mmc_slot(host).no_off = 1;
1835
1836         mmc->f_min = OMAP_MMC_MIN_CLOCK;
1837
1838         if (pdata->max_freq > 0)
1839                 mmc->f_max = pdata->max_freq;
1840         else
1841                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
1842
1843         spin_lock_init(&host->irq_lock);
1844
1845         host->fclk = clk_get(&pdev->dev, "fck");
1846         if (IS_ERR(host->fclk)) {
1847                 ret = PTR_ERR(host->fclk);
1848                 host->fclk = NULL;
1849                 goto err1;
1850         }
1851
1852         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
1853                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
1854                 mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
1855         }
1856
1857         pm_runtime_enable(host->dev);
1858         pm_runtime_get_sync(host->dev);
1859         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
1860         pm_runtime_use_autosuspend(host->dev);
1861
1862         omap_hsmmc_context_save(host);
1863
1864         host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
1865         /*
1866          * MMC can still work without debounce clock.
1867          */
1868         if (IS_ERR(host->dbclk)) {
1869                 host->dbclk = NULL;
1870         } else if (clk_prepare_enable(host->dbclk) != 0) {
1871                 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
1872                 clk_put(host->dbclk);
1873                 host->dbclk = NULL;
1874         }
1875
1876         /* Since we do only SG emulation, we can have as many segs
1877          * as we want. */
1878         mmc->max_segs = 1024;
1879
1880         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
1881         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
1882         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1883         mmc->max_seg_size = mmc->max_req_size;
1884
1885         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1886                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
1887
1888         mmc->caps |= mmc_slot(host).caps;
1889         if (mmc->caps & MMC_CAP_8_BIT_DATA)
1890                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1891
1892         if (mmc_slot(host).nonremovable)
1893                 mmc->caps |= MMC_CAP_NONREMOVABLE;
1894
1895         mmc->pm_caps = mmc_slot(host).pm_caps;
1896
1897         omap_hsmmc_conf_bus_power(host);
1898
1899         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1900         if (!res) {
1901                 dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
1902                 ret = -ENXIO;
1903                 goto err_irq;
1904         }
1905         tx_req = res->start;
1906
1907         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1908         if (!res) {
1909                 dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
1910                 ret = -ENXIO;
1911                 goto err_irq;
1912         }
1913         rx_req = res->start;
1914
1915         dma_cap_zero(mask);
1916         dma_cap_set(DMA_SLAVE, mask);
1917
1918         host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &rx_req);
1919         if (!host->rx_chan) {
1920                 dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
1921                 ret = -ENXIO;
1922                 goto err_irq;
1923         }
1924
1925         host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &tx_req);
1926         if (!host->tx_chan) {
1927                 dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
1928                 ret = -ENXIO;
1929                 goto err_irq;
1930         }
1931
1932         /* Request IRQ for MMC operations */
1933         ret = request_irq(host->irq, omap_hsmmc_irq, 0,
1934                         mmc_hostname(mmc), host);
1935         if (ret) {
1936                 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
1937                 goto err_irq;
1938         }
1939
1940         if (pdata->init != NULL) {
1941                 if (pdata->init(&pdev->dev) != 0) {
1942                         dev_err(mmc_dev(host->mmc),
1943                                 "Unable to configure MMC IRQs\n");
1944                         goto err_irq_cd_init;
1945                 }
1946         }
1947
1948         if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
1949                 ret = omap_hsmmc_reg_get(host);
1950                 if (ret)
1951                         goto err_reg;
1952                 host->use_reg = 1;
1953         }
1954
1955         mmc->ocr_avail = mmc_slot(host).ocr_mask;
1956
1957         /* Request IRQ for card detect */
1958         if ((mmc_slot(host).card_detect_irq)) {
1959                 ret = request_threaded_irq(mmc_slot(host).card_detect_irq,
1960                                            NULL,
1961                                            omap_hsmmc_detect,
1962                                            IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1963                                            mmc_hostname(mmc), host);
1964                 if (ret) {
1965                         dev_err(mmc_dev(host->mmc),
1966                                 "Unable to grab MMC CD IRQ\n");
1967                         goto err_irq_cd;
1968                 }
1969                 pdata->suspend = omap_hsmmc_suspend_cdirq;
1970                 pdata->resume = omap_hsmmc_resume_cdirq;
1971         }
1972
1973         omap_hsmmc_disable_irq(host);
1974
1975         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
1976         if (IS_ERR(pinctrl))
1977                 dev_warn(&pdev->dev,
1978                         "pins are not configured from the driver\n");
1979
1980         omap_hsmmc_protect_card(host);
1981
1982         mmc_add_host(mmc);
1983
1984         if (mmc_slot(host).name != NULL) {
1985                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
1986                 if (ret < 0)
1987                         goto err_slot_name;
1988         }
1989         if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
1990                 ret = device_create_file(&mmc->class_dev,
1991                                         &dev_attr_cover_switch);
1992                 if (ret < 0)
1993                         goto err_slot_name;
1994         }
1995
1996         omap_hsmmc_debugfs(mmc);
1997         pm_runtime_mark_last_busy(host->dev);
1998         pm_runtime_put_autosuspend(host->dev);
1999
2000         return 0;
2001
2002 err_slot_name:
2003         mmc_remove_host(mmc);
2004         free_irq(mmc_slot(host).card_detect_irq, host);
2005 err_irq_cd:
2006         if (host->use_reg)
2007                 omap_hsmmc_reg_put(host);
2008 err_reg:
2009         if (host->pdata->cleanup)
2010                 host->pdata->cleanup(&pdev->dev);
2011 err_irq_cd_init:
2012         free_irq(host->irq, host);
2013 err_irq:
2014         if (host->tx_chan)
2015                 dma_release_channel(host->tx_chan);
2016         if (host->rx_chan)
2017                 dma_release_channel(host->rx_chan);
2018         pm_runtime_put_sync(host->dev);
2019         pm_runtime_disable(host->dev);
2020         clk_put(host->fclk);
2021         if (host->dbclk) {
2022                 clk_disable_unprepare(host->dbclk);
2023                 clk_put(host->dbclk);
2024         }
2025 err1:
2026         iounmap(host->base);
2027         platform_set_drvdata(pdev, NULL);
2028         mmc_free_host(mmc);
2029 err_alloc:
2030         omap_hsmmc_gpio_free(pdata);
2031 err:
2032         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2033         if (res)
2034                 release_mem_region(res->start, resource_size(res));
2035         return ret;
2036 }
2037
2038 static int omap_hsmmc_remove(struct platform_device *pdev)
2039 {
2040         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2041         struct resource *res;
2042
2043         pm_runtime_get_sync(host->dev);
2044         mmc_remove_host(host->mmc);
2045         if (host->use_reg)
2046                 omap_hsmmc_reg_put(host);
2047         if (host->pdata->cleanup)
2048                 host->pdata->cleanup(&pdev->dev);
2049         free_irq(host->irq, host);
2050         if (mmc_slot(host).card_detect_irq)
2051                 free_irq(mmc_slot(host).card_detect_irq, host);
2052
2053         if (host->tx_chan)
2054                 dma_release_channel(host->tx_chan);
2055         if (host->rx_chan)
2056                 dma_release_channel(host->rx_chan);
2057
2058         pm_runtime_put_sync(host->dev);
2059         pm_runtime_disable(host->dev);
2060         clk_put(host->fclk);
2061         if (host->dbclk) {
2062                 clk_disable_unprepare(host->dbclk);
2063                 clk_put(host->dbclk);
2064         }
2065
2066         omap_hsmmc_gpio_free(host->pdata);
2067         iounmap(host->base);
2068         mmc_free_host(host->mmc);
2069
2070         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2071         if (res)
2072                 release_mem_region(res->start, resource_size(res));
2073         platform_set_drvdata(pdev, NULL);
2074
2075         return 0;
2076 }
2077
2078 #ifdef CONFIG_PM
2079 static int omap_hsmmc_prepare(struct device *dev)
2080 {
2081         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2082
2083         if (host->pdata->suspend)
2084                 return host->pdata->suspend(dev, host->slot_id);
2085
2086         return 0;
2087 }
2088
2089 static void omap_hsmmc_complete(struct device *dev)
2090 {
2091         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2092
2093         if (host->pdata->resume)
2094                 host->pdata->resume(dev, host->slot_id);
2095
2096 }
2097
2098 static int omap_hsmmc_suspend(struct device *dev)
2099 {
2100         int ret = 0;
2101         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2102
2103         if (!host)
2104                 return 0;
2105
2106         if (host && host->suspended)
2107                 return 0;
2108
2109         pm_runtime_get_sync(host->dev);
2110         host->suspended = 1;
2111         ret = mmc_suspend_host(host->mmc);
2112
2113         if (ret) {
2114                 host->suspended = 0;
2115                 goto err;
2116         }
2117
2118         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2119                 omap_hsmmc_disable_irq(host);
2120                 OMAP_HSMMC_WRITE(host->base, HCTL,
2121                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2122         }
2123
2124         if (host->dbclk)
2125                 clk_disable_unprepare(host->dbclk);
2126 err:
2127         pm_runtime_put_sync(host->dev);
2128         return ret;
2129 }
2130
2131 /* Routine to resume the MMC device */
2132 static int omap_hsmmc_resume(struct device *dev)
2133 {
2134         int ret = 0;
2135         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2136
2137         if (!host)
2138                 return 0;
2139
2140         if (host && !host->suspended)
2141                 return 0;
2142
2143         pm_runtime_get_sync(host->dev);
2144
2145         if (host->dbclk)
2146                 clk_prepare_enable(host->dbclk);
2147
2148         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2149                 omap_hsmmc_conf_bus_power(host);
2150
2151         omap_hsmmc_protect_card(host);
2152
2153         /* Notify the core to resume the host */
2154         ret = mmc_resume_host(host->mmc);
2155         if (ret == 0)
2156                 host->suspended = 0;
2157
2158         pm_runtime_mark_last_busy(host->dev);
2159         pm_runtime_put_autosuspend(host->dev);
2160
2161         return ret;
2162
2163 }
2164
2165 #else
2166 #define omap_hsmmc_prepare      NULL
2167 #define omap_hsmmc_complete     NULL
2168 #define omap_hsmmc_suspend      NULL
2169 #define omap_hsmmc_resume       NULL
2170 #endif
2171
2172 static int omap_hsmmc_runtime_suspend(struct device *dev)
2173 {
2174         struct omap_hsmmc_host *host;
2175
2176         host = platform_get_drvdata(to_platform_device(dev));
2177         omap_hsmmc_context_save(host);
2178         dev_dbg(dev, "disabled\n");
2179
2180         return 0;
2181 }
2182
2183 static int omap_hsmmc_runtime_resume(struct device *dev)
2184 {
2185         struct omap_hsmmc_host *host;
2186
2187         host = platform_get_drvdata(to_platform_device(dev));
2188         omap_hsmmc_context_restore(host);
2189         dev_dbg(dev, "enabled\n");
2190
2191         return 0;
2192 }
2193
2194 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2195         .suspend        = omap_hsmmc_suspend,
2196         .resume         = omap_hsmmc_resume,
2197         .prepare        = omap_hsmmc_prepare,
2198         .complete       = omap_hsmmc_complete,
2199         .runtime_suspend = omap_hsmmc_runtime_suspend,
2200         .runtime_resume = omap_hsmmc_runtime_resume,
2201 };
2202
2203 static struct platform_driver omap_hsmmc_driver = {
2204         .probe          = omap_hsmmc_probe,
2205         .remove         = omap_hsmmc_remove,
2206         .driver         = {
2207                 .name = DRIVER_NAME,
2208                 .owner = THIS_MODULE,
2209                 .pm = &omap_hsmmc_dev_pm_ops,
2210                 .of_match_table = of_match_ptr(omap_mmc_of_match),
2211         },
2212 };
2213
2214 module_platform_driver(omap_hsmmc_driver);
2215 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2216 MODULE_LICENSE("GPL");
2217 MODULE_ALIAS("platform:" DRIVER_NAME);
2218 MODULE_AUTHOR("Texas Instruments Inc");