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/workqueue.h>
  28 #include <linux/timer.h>
  29 #include <linux/clk.h>
  30 #include <linux/mmc/host.h>
  31 #include <linux/mmc/core.h>
  32 #include <linux/mmc/mmc.h>
  33 #include <linux/io.h>
  34 #include <linux/semaphore.h>
  35 #include <linux/gpio.h>
  36 #include <linux/regulator/consumer.h>
  37 #include <linux/pm_runtime.h>
  38 #include <plat/dma.h>
  39 #include <mach/hardware.h>
  40 #include <plat/board.h>
  41 #include <plat/mmc.h>
  42 #include <plat/cpu.h>
  43
  44 /* OMAP HSMMC Host Controller Registers */
  45 #define OMAP_HSMMC_SYSCONFIG    0x0010
  46 #define OMAP_HSMMC_SYSSTATUS    0x0014
  47 #define OMAP_HSMMC_CON          0x002C
  48 #define OMAP_HSMMC_BLK          0x0104
  49 #define OMAP_HSMMC_ARG          0x0108
  50 #define OMAP_HSMMC_CMD          0x010C
  51 #define OMAP_HSMMC_RSP10        0x0110
  52 #define OMAP_HSMMC_RSP32        0x0114
  53 #define OMAP_HSMMC_RSP54        0x0118
  54 #define OMAP_HSMMC_RSP76        0x011C
  55 #define OMAP_HSMMC_DATA         0x0120
  56 #define OMAP_HSMMC_HCTL         0x0128
  57 #define OMAP_HSMMC_SYSCTL       0x012C
  58 #define OMAP_HSMMC_STAT         0x0130
  59 #define OMAP_HSMMC_IE           0x0134
  60 #define OMAP_HSMMC_ISE          0x0138
  61 #define OMAP_HSMMC_CAPA         0x0140
  62
  63 #define VS18                    (1 << 26)
  64 #define VS30                    (1 << 25)
  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 INT_EN_MASK             0x307F0033
  82 #define BWR_ENABLE              (1 << 4)
  83 #define BRR_ENABLE              (1 << 5)
  84 #define DTO_ENABLE              (1 << 20)
  85 #define INIT_STREAM             (1 << 1)
  86 #define DP_SELECT               (1 << 21)
  87 #define DDIR                    (1 << 4)
  88 #define DMA_EN                  0x1
  89 #define MSBS                    (1 << 5)
  90 #define BCE                     (1 << 1)
  91 #define FOUR_BIT                (1 << 1)
  92 #define DW8                     (1 << 5)
  93 #define CC                      0x1
  94 #define TC                      0x02
  95 #define OD                      0x1
  96 #define ERR                     (1 << 15)
  97 #define CMD_TIMEOUT             (1 << 16)
  98 #define DATA_TIMEOUT            (1 << 20)
  99 #define CMD_CRC                 (1 << 17)
 100 #define DATA_CRC                (1 << 21)
 101 #define CARD_ERR                (1 << 28)
 102 #define STAT_CLEAR              0xFFFFFFFF
 103 #define INIT_STREAM_CMD         0x00000000
 104 #define DUAL_VOLT_OCR_BIT       7
 105 #define SRC                     (1 << 25)
 106 #define SRD                     (1 << 26)
 107 #define SOFTRESET               (1 << 1)
 108 #define RESETDONE               (1 << 0)
 109
 110 /*
 111  * FIXME: Most likely all the data using these _DEVID defines should come
 112  * from the platform_data, or implemented in controller and slot specific
 113  * functions.
 114  */
 115 #define OMAP_MMC1_DEVID         0
 116 #define OMAP_MMC2_DEVID         1
 117 #define OMAP_MMC3_DEVID         2
 118 #define OMAP_MMC4_DEVID         3
 119 #define OMAP_MMC5_DEVID         4
 120
 121 #define MMC_AUTOSUSPEND_DELAY   100
 122 #define MMC_TIMEOUT_MS          20
 123 #define OMAP_MMC_MASTER_CLOCK   96000000
 124 #define OMAP_MMC_MIN_CLOCK      400000
 125 #define OMAP_MMC_MAX_CLOCK      52000000
 126 #define DRIVER_NAME             "omap_hsmmc"
 127
 128 /*
 129  * One controller can have multiple slots, like on some omap boards using
 130  * omap.c controller driver. Luckily this is not currently done on any known
 131  * omap_hsmmc.c device.
 132  */
 133 #define mmc_slot(host)          (host->pdata->slots[host->slot_id])
 134
 135 /*
 136  * MMC Host controller read/write API's
 137  */
 138 #define OMAP_HSMMC_READ(base, reg)      \
 139         __raw_readl((base) + OMAP_HSMMC_##reg)
 140
 141 #define OMAP_HSMMC_WRITE(base, reg, val) \
 142         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
 143
 144 struct omap_hsmmc_next {
 145         unsigned int    dma_len;
 146         s32             cookie;
 147 };
 148
 149 struct omap_hsmmc_host {
 150         struct  device          *dev;
 151         struct  mmc_host        *mmc;
 152         struct  mmc_request     *mrq;
 153         struct  mmc_command     *cmd;
 154         struct  mmc_data        *data;
 155         struct  clk             *fclk;
 156         struct  clk             *dbclk;
 157         /*
 158          * vcc == configured supply
 159          * vcc_aux == optional
 160          *   -  MMC1, supply for DAT4..DAT7
 161          *   -  MMC2/MMC2, external level shifter voltage supply, for
 162          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
 163          */
 164         struct  regulator       *vcc;
 165         struct  regulator       *vcc_aux;
 166         struct  work_struct     mmc_carddetect_work;
 167         void    __iomem         *base;
 168         resource_size_t         mapbase;
 169         spinlock_t              irq_lock; /* Prevent races with irq handler */
 170         unsigned int            id;
 171         unsigned int            dma_len;
 172         unsigned int            dma_sg_idx;
 173         unsigned char           bus_mode;
 174         unsigned char           power_mode;
 175         u32                     *buffer;
 176         u32                     bytesleft;
 177         int                     suspended;
 178         int                     irq;
 179         int                     use_dma, dma_ch;
 180         int                     dma_line_tx, dma_line_rx;
 181         int                     slot_id;
 182         int                     got_dbclk;
 183         int                     response_busy;
 184         int                     context_loss;
 185         int                     dpm_state;
 186         int                     vdd;
 187         int                     protect_card;
 188         int                     reqs_blocked;
 189         int                     use_reg;
 190         int                     req_in_progress;
 191         struct omap_hsmmc_next  next_data;
 192
 193         struct  omap_mmc_platform_data  *pdata;
 194 };
 195
 196 static int omap_hsmmc_card_detect(struct device *dev, int slot)
 197 {
 198         struct omap_mmc_platform_data *mmc = dev->platform_data;
 199
 200         /* NOTE: assumes card detect signal is active-low */
 201         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 202 }
 203
 204 static int omap_hsmmc_get_wp(struct device *dev, int slot)
 205 {
 206         struct omap_mmc_platform_data *mmc = dev->platform_data;
 207
 208         /* NOTE: assumes write protect signal is active-high */
 209         return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
 210 }
 211
 212 static int omap_hsmmc_get_cover_state(struct device *dev, int slot)
 213 {
 214         struct omap_mmc_platform_data *mmc = dev->platform_data;
 215
 216         /* NOTE: assumes card detect signal is active-low */
 217         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
 218 }
 219
 220 #ifdef CONFIG_PM
 221
 222 static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot)
 223 {
 224         struct omap_mmc_platform_data *mmc = dev->platform_data;
 225
 226         disable_irq(mmc->slots[0].card_detect_irq);
 227         return 0;
 228 }
 229
 230 static int omap_hsmmc_resume_cdirq(struct device *dev, int slot)
 231 {
 232         struct omap_mmc_platform_data *mmc = dev->platform_data;
 233
 234         enable_irq(mmc->slots[0].card_detect_irq);
 235         return 0;
 236 }
 237
 238 #else
 239
 240 #define omap_hsmmc_suspend_cdirq        NULL
 241 #define omap_hsmmc_resume_cdirq         NULL
 242
 243 #endif
 244
 245 #ifdef CONFIG_REGULATOR
 246
 247 static int omap_hsmmc_1_set_power(struct device *dev, int slot, int power_on,
 248                                   int vdd)
 249 {
 250         struct omap_hsmmc_host *host =
 251                 platform_get_drvdata(to_platform_device(dev));
 252         int ret;
 253
 254         if (mmc_slot(host).before_set_reg)
 255                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
 256
 257         if (power_on)
 258                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 259         else
 260                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
 261
 262         if (mmc_slot(host).after_set_reg)
 263                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
 264
 265         return ret;
 266 }
 267
 268 static int omap_hsmmc_235_set_power(struct device *dev, int slot, int power_on,
 269                                    int vdd)
 270 {
 271         struct omap_hsmmc_host *host =
 272                 platform_get_drvdata(to_platform_device(dev));
 273         int ret = 0;
 274
 275         /*
 276          * If we don't see a Vcc regulator, assume it's a fixed
 277          * voltage always-on regulator.
 278          */
 279         if (!host->vcc)
 280                 return 0;
 281
 282         if (mmc_slot(host).before_set_reg)
 283                 mmc_slot(host).before_set_reg(dev, slot, power_on, vdd);
 284
 285         /*
 286          * Assume Vcc regulator is used only to power the card ... OMAP
 287          * VDDS is used to power the pins, optionally with a transceiver to
 288          * support cards using voltages other than VDDS (1.8V nominal).  When a
 289          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 290          *
 291          * In some cases this regulator won't support enable/disable;
 292          * e.g. it's a fixed rail for a WLAN chip.
 293          *
 294          * In other cases vcc_aux switches interface power.  Example, for
 295          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 296          * chips/cards need an interface voltage rail too.
 297          */
 298         if (power_on) {
 299                 ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 300                 /* Enable interface voltage rail, if needed */
 301                 if (ret == 0 && host->vcc_aux) {
 302                         ret = regulator_enable(host->vcc_aux);
 303                         if (ret < 0)
 304                                 ret = mmc_regulator_set_ocr(host->mmc,
 305                                                         host->vcc, 0);
 306                 }
 307         } else {
 308                 /* Shut down the rail */
 309                 if (host->vcc_aux)
 310                         ret = regulator_disable(host->vcc_aux);
 311                 if (!ret) {
 312                         /* Then proceed to shut down the local regulator */
 313                         ret = mmc_regulator_set_ocr(host->mmc,
 314                                                 host->vcc, 0);
 315                 }
 316         }
 317
 318         if (mmc_slot(host).after_set_reg)
 319                 mmc_slot(host).after_set_reg(dev, slot, power_on, vdd);
 320
 321         return ret;
 322 }
 323
 324 static int omap_hsmmc_4_set_power(struct device *dev, int slot, int power_on,
 325                                         int vdd)
 326 {
 327         return 0;
 328 }
 329
 330 static int omap_hsmmc_1_set_sleep(struct device *dev, int slot, int sleep,
 331                                   int vdd, int cardsleep)
 332 {
 333         struct omap_hsmmc_host *host =
 334                 platform_get_drvdata(to_platform_device(dev));
 335         int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
 336
 337         return regulator_set_mode(host->vcc, mode);
 338 }
 339
 340 static int omap_hsmmc_235_set_sleep(struct device *dev, int slot, int sleep,
 341                                    int vdd, int cardsleep)
 342 {
 343         struct omap_hsmmc_host *host =
 344                 platform_get_drvdata(to_platform_device(dev));
 345         int err, mode;
 346
 347         /*
 348          * If we don't see a Vcc regulator, assume it's a fixed
 349          * voltage always-on regulator.
 350          */
 351         if (!host->vcc)
 352                 return 0;
 353
 354         mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
 355
 356         if (!host->vcc_aux)
 357                 return regulator_set_mode(host->vcc, mode);
 358
 359         if (cardsleep) {
 360                 /* VCC can be turned off if card is asleep */
 361                 if (sleep)
 362                         err = mmc_regulator_set_ocr(host->mmc, host->vcc, 0);
 363                 else
 364                         err = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd);
 365         } else
 366                 err = regulator_set_mode(host->vcc, mode);
 367         if (err)
 368                 return err;
 369
 370         if (!mmc_slot(host).vcc_aux_disable_is_sleep)
 371                 return regulator_set_mode(host->vcc_aux, mode);
 372
 373         if (sleep)
 374                 return regulator_disable(host->vcc_aux);
 375         else
 376                 return regulator_enable(host->vcc_aux);
 377 }
 378
 379 static int omap_hsmmc_4_set_sleep(struct device *dev, int slot, int sleep,
 380                                         int vdd, int cardsleep)
 381 {
 382         return 0;
 383 }
 384
 385 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 386 {
 387         struct regulator *reg;
 388         int ret = 0;
 389         int ocr_value = 0;
 390
 391         switch (host->id) {
 392         case OMAP_MMC1_DEVID:
 393                 /* On-chip level shifting via PBIAS0/PBIAS1 */
 394                 mmc_slot(host).set_power = omap_hsmmc_1_set_power;
 395                 mmc_slot(host).set_sleep = omap_hsmmc_1_set_sleep;
 396                 break;
 397         case OMAP_MMC2_DEVID:
 398         case OMAP_MMC3_DEVID:
 399         case OMAP_MMC5_DEVID:
 400                 /* Off-chip level shifting, or none */
 401                 mmc_slot(host).set_power = omap_hsmmc_235_set_power;
 402                 mmc_slot(host).set_sleep = omap_hsmmc_235_set_sleep;
 403                 break;
 404         case OMAP_MMC4_DEVID:
 405                 mmc_slot(host).set_power = omap_hsmmc_4_set_power;
 406                 mmc_slot(host).set_sleep = omap_hsmmc_4_set_sleep;
 407         default:
 408                 pr_err("MMC%d configuration not supported!\n", host->id);
 409                 return -EINVAL;
 410         }
 411
 412         reg = regulator_get(host->dev, "vmmc");
 413         if (IS_ERR(reg)) {
 414                 dev_dbg(host->dev, "vmmc regulator missing\n");
 415                 /*
 416                 * HACK: until fixed.c regulator is usable,
 417                 * we don't require a main regulator
 418                 * for MMC2 or MMC3
 419                 */
 420                 if (host->id == OMAP_MMC1_DEVID) {
 421                         ret = PTR_ERR(reg);
 422                         goto err;
 423                 }
 424         } else {
 425                 host->vcc = reg;
 426                 ocr_value = mmc_regulator_get_ocrmask(reg);
 427                 if (!mmc_slot(host).ocr_mask) {
 428                         mmc_slot(host).ocr_mask = ocr_value;
 429                 } else {
 430                         if (!(mmc_slot(host).ocr_mask & ocr_value)) {
 431                                 pr_err("MMC%d ocrmask %x is not supported\n",
 432                                         host->id, mmc_slot(host).ocr_mask);
 433                                 mmc_slot(host).ocr_mask = 0;
 434                                 return -EINVAL;
 435                         }
 436                 }
 437
 438                 /* Allow an aux regulator */
 439                 reg = regulator_get(host->dev, "vmmc_aux");
 440                 host->vcc_aux = IS_ERR(reg) ? NULL : reg;
 441
 442                 /* For eMMC do not power off when not in sleep state */
 443                 if (mmc_slot(host).no_regulator_off_init)
 444                         return 0;
 445                 /*
 446                 * UGLY HACK:  workaround regulator framework bugs.
 447                 * When the bootloader leaves a supply active, it's
 448                 * initialized with zero usecount ... and we can't
 449                 * disable it without first enabling it.  Until the
 450                 * framework is fixed, we need a workaround like this
 451                 * (which is safe for MMC, but not in general).
 452                 */
 453                 if (regulator_is_enabled(host->vcc) > 0) {
 454                         regulator_enable(host->vcc);
 455                         regulator_disable(host->vcc);
 456                 }
 457                 if (host->vcc_aux) {
 458                         if (regulator_is_enabled(reg) > 0) {
 459                                 regulator_enable(reg);
 460                                 regulator_disable(reg);
 461                         }
 462                 }
 463         }
 464
 465         return 0;
 466
 467 err:
 468         mmc_slot(host).set_power = NULL;
 469         mmc_slot(host).set_sleep = NULL;
 470         return ret;
 471 }
 472
 473 static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 474 {
 475         regulator_put(host->vcc);
 476         regulator_put(host->vcc_aux);
 477         mmc_slot(host).set_power = NULL;
 478         mmc_slot(host).set_sleep = NULL;
 479 }
 480
 481 static inline int omap_hsmmc_have_reg(void)
 482 {
 483         return 1;
 484 }
 485
 486 #else
 487
 488 static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 489 {
 490         return -EINVAL;
 491 }
 492
 493 static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host)
 494 {
 495 }
 496
 497 static inline int omap_hsmmc_have_reg(void)
 498 {
 499         return 0;
 500 }
 501
 502 #endif
 503
 504 static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
 505 {
 506         int ret;
 507
 508         if (gpio_is_valid(pdata->slots[0].switch_pin)) {
 509                 if (pdata->slots[0].cover)
 510                         pdata->slots[0].get_cover_state =
 511                                         omap_hsmmc_get_cover_state;
 512                 else
 513                         pdata->slots[0].card_detect = omap_hsmmc_card_detect;
 514                 pdata->slots[0].card_detect_irq =
 515                                 gpio_to_irq(pdata->slots[0].switch_pin);
 516                 ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd");
 517                 if (ret)
 518                         return ret;
 519                 ret = gpio_direction_input(pdata->slots[0].switch_pin);
 520                 if (ret)
 521                         goto err_free_sp;
 522         } else
 523                 pdata->slots[0].switch_pin = -EINVAL;
 524
 525         if (gpio_is_valid(pdata->slots[0].gpio_wp)) {
 526                 pdata->slots[0].get_ro = omap_hsmmc_get_wp;
 527                 ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp");
 528                 if (ret)
 529                         goto err_free_cd;
 530                 ret = gpio_direction_input(pdata->slots[0].gpio_wp);
 531                 if (ret)
 532                         goto err_free_wp;
 533         } else
 534                 pdata->slots[0].gpio_wp = -EINVAL;
 535
 536         return 0;
 537
 538 err_free_wp:
 539         gpio_free(pdata->slots[0].gpio_wp);
 540 err_free_cd:
 541         if (gpio_is_valid(pdata->slots[0].switch_pin))
 542 err_free_sp:
 543                 gpio_free(pdata->slots[0].switch_pin);
 544         return ret;
 545 }
 546
 547 static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
 548 {
 549         if (gpio_is_valid(pdata->slots[0].gpio_wp))
 550                 gpio_free(pdata->slots[0].gpio_wp);
 551         if (gpio_is_valid(pdata->slots[0].switch_pin))
 552                 gpio_free(pdata->slots[0].switch_pin);
 553 }
 554
 555 /*
 556  * Start clock to the card
 557  */
 558 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
 559 {
 560         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 561                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 562 }
 563
 564 /*
 565  * Stop clock to the card
 566  */
 567 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
 568 {
 569         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 570                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 571         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 572                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n");
 573 }
 574
 575 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
 576                                   struct mmc_command *cmd)
 577 {
 578         unsigned int irq_mask;
 579
 580         if (host->use_dma)
 581                 irq_mask = INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE);
 582         else
 583                 irq_mask = INT_EN_MASK;
 584
 585         /* Disable timeout for erases */
 586         if (cmd->opcode == MMC_ERASE)
 587                 irq_mask &= ~DTO_ENABLE;
 588
 589         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 590         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
 591         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 592 }
 593
 594 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
 595 {
 596         OMAP_HSMMC_WRITE(host->base, ISE, 0);
 597         OMAP_HSMMC_WRITE(host->base, IE, 0);
 598         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 599 }
 600
 601 /* Calculate divisor for the given clock frequency */
 602 static u16 calc_divisor(struct mmc_ios *ios)
 603 {
 604         u16 dsor = 0;
 605
 606         if (ios->clock) {
 607                 dsor = DIV_ROUND_UP(OMAP_MMC_MASTER_CLOCK, ios->clock);
 608                 if (dsor > 250)
 609                         dsor = 250;
 610         }
 611
 612         return dsor;
 613 }
 614
 615 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
 616 {
 617         struct mmc_ios *ios = &host->mmc->ios;
 618         unsigned long regval;
 619         unsigned long timeout;
 620
 621         dev_dbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
 622
 623         omap_hsmmc_stop_clock(host);
 624
 625         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 626         regval = regval & ~(CLKD_MASK | DTO_MASK);
 627         regval = regval | (calc_divisor(ios) << 6) | (DTO << 16);
 628         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 629         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 630                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 631
 632         /* Wait till the ICS bit is set */
 633         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 634         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
 635                 && time_before(jiffies, timeout))
 636                 cpu_relax();
 637
 638         omap_hsmmc_start_clock(host);
 639 }
 640
 641 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
 642 {
 643         struct mmc_ios *ios = &host->mmc->ios;
 644         u32 con;
 645
 646         con = OMAP_HSMMC_READ(host->base, CON);
 647         switch (ios->bus_width) {
 648         case MMC_BUS_WIDTH_8:
 649                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
 650                 break;
 651         case MMC_BUS_WIDTH_4:
 652                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 653                 OMAP_HSMMC_WRITE(host->base, HCTL,
 654                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 655                 break;
 656         case MMC_BUS_WIDTH_1:
 657                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 658                 OMAP_HSMMC_WRITE(host->base, HCTL,
 659                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 660                 break;
 661         }
 662 }
 663
 664 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
 665 {
 666         struct mmc_ios *ios = &host->mmc->ios;
 667         u32 con;
 668
 669         con = OMAP_HSMMC_READ(host->base, CON);
 670         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 671                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
 672         else
 673                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
 674 }
 675
 676 #ifdef CONFIG_PM
 677
 678 /*
 679  * Restore the MMC host context, if it was lost as result of a
 680  * power state change.
 681  */
 682 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 683 {
 684         struct mmc_ios *ios = &host->mmc->ios;
 685         struct omap_mmc_platform_data *pdata = host->pdata;
 686         int context_loss = 0;
 687         u32 hctl, capa;
 688         unsigned long timeout;
 689
 690         if (pdata->get_context_loss_count) {
 691                 context_loss = pdata->get_context_loss_count(host->dev);
 692                 if (context_loss < 0)
 693                         return 1;
 694         }
 695
 696         dev_dbg(mmc_dev(host->mmc), "context was %slost\n",
 697                 context_loss == host->context_loss ? "not " : "");
 698         if (host->context_loss == context_loss)
 699                 return 1;
 700
 701         /* Wait for hardware reset */
 702         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 703         while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
 704                 && time_before(jiffies, timeout))
 705                 ;
 706
 707         /* Do software reset */
 708         OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET);
 709         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 710         while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE
 711                 && time_before(jiffies, timeout))
 712                 ;
 713
 714         OMAP_HSMMC_WRITE(host->base, SYSCONFIG,
 715                         OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE);
 716
 717         if (host->id == OMAP_MMC1_DEVID) {
 718                 if (host->power_mode != MMC_POWER_OFF &&
 719                     (1 << ios->vdd) <= MMC_VDD_23_24)
 720                         hctl = SDVS18;
 721                 else
 722                         hctl = SDVS30;
 723                 capa = VS30 | VS18;
 724         } else {
 725                 hctl = SDVS18;
 726                 capa = VS18;
 727         }
 728
 729         OMAP_HSMMC_WRITE(host->base, HCTL,
 730                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
 731
 732         OMAP_HSMMC_WRITE(host->base, CAPA,
 733                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
 734
 735         OMAP_HSMMC_WRITE(host->base, HCTL,
 736                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 737
 738         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 739         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
 740                 && time_before(jiffies, timeout))
 741                 ;
 742
 743         omap_hsmmc_disable_irq(host);
 744
 745         /* Do not initialize card-specific things if the power is off */
 746         if (host->power_mode == MMC_POWER_OFF)
 747                 goto out;
 748
 749         omap_hsmmc_set_bus_width(host);
 750
 751         omap_hsmmc_set_clock(host);
 752
 753         omap_hsmmc_set_bus_mode(host);
 754
 755 out:
 756         host->context_loss = context_loss;
 757
 758         dev_dbg(mmc_dev(host->mmc), "context is restored\n");
 759         return 0;
 760 }
 761
 762 /*
 763  * Save the MMC host context (store the number of power state changes so far).
 764  */
 765 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 766 {
 767         struct omap_mmc_platform_data *pdata = host->pdata;
 768         int context_loss;
 769
 770         if (pdata->get_context_loss_count) {
 771                 context_loss = pdata->get_context_loss_count(host->dev);
 772                 if (context_loss < 0)
 773                         return;
 774                 host->context_loss = context_loss;
 775         }
 776 }
 777
 778 #else
 779
 780 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 781 {
 782         return 0;
 783 }
 784
 785 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 786 {
 787 }
 788
 789 #endif
 790
 791 /*
 792  * Send init stream sequence to card
 793  * before sending IDLE command
 794  */
 795 static void send_init_stream(struct omap_hsmmc_host *host)
 796 {
 797         int reg = 0;
 798         unsigned long timeout;
 799
 800         if (host->protect_card)
 801                 return;
 802
 803         disable_irq(host->irq);
 804
 805         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 806         OMAP_HSMMC_WRITE(host->base, CON,
 807                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 808         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 809
 810         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 811         while ((reg != CC) && time_before(jiffies, timeout))
 812                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC;
 813
 814         OMAP_HSMMC_WRITE(host->base, CON,
 815                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 816
 817         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 818         OMAP_HSMMC_READ(host->base, STAT);
 819
 820         enable_irq(host->irq);
 821 }
 822
 823 static inline
 824 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
 825 {
 826         int r = 1;
 827
 828         if (mmc_slot(host).get_cover_state)
 829                 r = mmc_slot(host).get_cover_state(host->dev, host->slot_id);
 830         return r;
 831 }
 832
 833 static ssize_t
 834 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
 835                            char *buf)
 836 {
 837         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 838         struct omap_hsmmc_host *host = mmc_priv(mmc);
 839
 840         return sprintf(buf, "%s\n",
 841                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
 842 }
 843
 844 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
 845
 846 static ssize_t
 847 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
 848                         char *buf)
 849 {
 850         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 851         struct omap_hsmmc_host *host = mmc_priv(mmc);
 852
 853         return sprintf(buf, "%s\n", mmc_slot(host).name);
 854 }
 855
 856 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
 857
 858 /*
 859  * Configure the response type and send the cmd.
 860  */
 861 static void
 862 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
 863         struct mmc_data *data)
 864 {
 865         int cmdreg = 0, resptype = 0, cmdtype = 0;
 866
 867         dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 868                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 869         host->cmd = cmd;
 870
 871         omap_hsmmc_enable_irq(host, cmd);
 872
 873         host->response_busy = 0;
 874         if (cmd->flags & MMC_RSP_PRESENT) {
 875                 if (cmd->flags & MMC_RSP_136)
 876                         resptype = 1;
 877                 else if (cmd->flags & MMC_RSP_BUSY) {
 878                         resptype = 3;
 879                         host->response_busy = 1;
 880                 } else
 881                         resptype = 2;
 882         }
 883
 884         /*
 885          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 886          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 887          * a val of 0x3, rest 0x0.
 888          */
 889         if (cmd == host->mrq->stop)
 890                 cmdtype = 0x3;
 891
 892         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 893
 894         if (data) {
 895                 cmdreg |= DP_SELECT | MSBS | BCE;
 896                 if (data->flags & MMC_DATA_READ)
 897                         cmdreg |= DDIR;
 898                 else
 899                         cmdreg &= ~(DDIR);
 900         }
 901
 902         if (host->use_dma)
 903                 cmdreg |= DMA_EN;
 904
 905         host->req_in_progress = 1;
 906
 907         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 908         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 909 }
 910
 911 static int
 912 omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data)
 913 {
 914         if (data->flags & MMC_DATA_WRITE)
 915                 return DMA_TO_DEVICE;
 916         else
 917                 return DMA_FROM_DEVICE;
 918 }
 919
 920 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
 921 {
 922         int dma_ch;
 923
 924         spin_lock(&host->irq_lock);
 925         host->req_in_progress = 0;
 926         dma_ch = host->dma_ch;
 927         spin_unlock(&host->irq_lock);
 928
 929         omap_hsmmc_disable_irq(host);
 930         /* Do not complete the request if DMA is still in progress */
 931         if (mrq->data && host->use_dma && dma_ch != -1)
 932                 return;
 933         host->mrq = NULL;
 934         mmc_request_done(host->mmc, mrq);
 935 }
 936
 937 /*
 938  * Notify the transfer complete to MMC core
 939  */
 940 static void
 941 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
 942 {
 943         if (!data) {
 944                 struct mmc_request *mrq = host->mrq;
 945
 946                 /* TC before CC from CMD6 - don't know why, but it happens */
 947                 if (host->cmd && host->cmd->opcode == 6 &&
 948                     host->response_busy) {
 949                         host->response_busy = 0;
 950                         return;
 951                 }
 952
 953                 omap_hsmmc_request_done(host, mrq);
 954                 return;
 955         }
 956
 957         host->data = NULL;
 958
 959         if (!data->error)
 960                 data->bytes_xfered += data->blocks * (data->blksz);
 961         else
 962                 data->bytes_xfered = 0;
 963
 964         if (!data->stop) {
 965                 omap_hsmmc_request_done(host, data->mrq);
 966                 return;
 967         }
 968         omap_hsmmc_start_command(host, data->stop, NULL);
 969 }
 970
 971 /*
 972  * Notify the core about command completion
 973  */
 974 static void
 975 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
 976 {
 977         host->cmd = NULL;
 978
 979         if (cmd->flags & MMC_RSP_PRESENT) {
 980                 if (cmd->flags & MMC_RSP_136) {
 981                         /* response type 2 */
 982                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
 983                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
 984                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
 985                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
 986                 } else {
 987                         /* response types 1, 1b, 3, 4, 5, 6 */
 988                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
 989                 }
 990         }
 991         if ((host->data == NULL && !host->response_busy) || cmd->error)
 992                 omap_hsmmc_request_done(host, cmd->mrq);
 993 }
 994
 995 /*
 996  * DMA clean up for command errors
 997  */
 998 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
 999 {
1000         int dma_ch;
1001
1002         host->data->error = errno;
1003
1004         spin_lock(&host->irq_lock);
1005         dma_ch = host->dma_ch;
1006         host->dma_ch = -1;
1007         spin_unlock(&host->irq_lock);
1008
1009         if (host->use_dma && dma_ch != -1) {
1010                 dma_unmap_sg(mmc_dev(host->mmc), host->data->sg,
1011                         host->data->sg_len,
1012                         omap_hsmmc_get_dma_dir(host, host->data));
1013                 omap_free_dma(dma_ch);
1014         }
1015         host->data = NULL;
1016 }
1017
1018 /*
1019  * Readable error output
1020  */
1021 #ifdef CONFIG_MMC_DEBUG
1022 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
1023 {
1024         /* --- means reserved bit without definition at documentation */
1025         static const char *omap_hsmmc_status_bits[] = {
1026                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
1027                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
1028                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
1029                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
1030         };
1031         char res[256];
1032         char *buf = res;
1033         int len, i;
1034
1035         len = sprintf(buf, "MMC IRQ 0x%x :", status);
1036         buf += len;
1037
1038         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
1039                 if (status & (1 << i)) {
1040                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
1041                         buf += len;
1042                 }
1043
1044         dev_dbg(mmc_dev(host->mmc), "%s\n", res);
1045 }
1046 #else
1047 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
1048                                              u32 status)
1049 {
1050 }
1051 #endif  /* CONFIG_MMC_DEBUG */
1052
1053 /*
1054  * MMC controller internal state machines reset
1055  *
1056  * Used to reset command or data internal state machines, using respectively
1057  *  SRC or SRD bit of SYSCTL register
1058  * Can be called from interrupt context
1059  */
1060 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1061                                                    unsigned long bit)
1062 {
1063         unsigned long i = 0;
1064         unsigned long limit = (loops_per_jiffy *
1065                                 msecs_to_jiffies(MMC_TIMEOUT_MS));
1066
1067         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1068                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1069
1070         /*
1071          * OMAP4 ES2 and greater has an updated reset logic.
1072          * Monitor a 0->1 transition first
1073          */
1074         if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) {
1075                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1076                                         && (i++ < limit))
1077                         cpu_relax();
1078         }
1079         i = 0;
1080
1081         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1082                 (i++ < limit))
1083                 cpu_relax();
1084
1085         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1086                 dev_err(mmc_dev(host->mmc),
1087                         "Timeout waiting on controller reset in %s\n",
1088                         __func__);
1089 }
1090
1091 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1092 {
1093         struct mmc_data *data;
1094         int end_cmd = 0, end_trans = 0;
1095
1096         if (!host->req_in_progress) {
1097                 do {
1098                         OMAP_HSMMC_WRITE(host->base, STAT, status);
1099                         /* Flush posted write */
1100                         status = OMAP_HSMMC_READ(host->base, STAT);
1101                 } while (status & INT_EN_MASK);
1102                 return;
1103         }
1104
1105         data = host->data;
1106         dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1107
1108         if (status & ERR) {
1109                 omap_hsmmc_dbg_report_irq(host, status);
1110                 if ((status & CMD_TIMEOUT) ||
1111                         (status & CMD_CRC)) {
1112                         if (host->cmd) {
1113                                 if (status & CMD_TIMEOUT) {
1114                                         omap_hsmmc_reset_controller_fsm(host,
1115                                                                         SRC);
1116                                         host->cmd->error = -ETIMEDOUT;
1117                                 } else {
1118                                         host->cmd->error = -EILSEQ;
1119                                 }
1120                                 end_cmd = 1;
1121                         }
1122                         if (host->data || host->response_busy) {
1123                                 if (host->data)
1124                                         omap_hsmmc_dma_cleanup(host,
1125                                                                 -ETIMEDOUT);
1126                                 host->response_busy = 0;
1127                                 omap_hsmmc_reset_controller_fsm(host, SRD);
1128                         }
1129                 }
1130                 if ((status & DATA_TIMEOUT) ||
1131                         (status & DATA_CRC)) {
1132                         if (host->data || host->response_busy) {
1133                                 int err = (status & DATA_TIMEOUT) ?
1134                                                 -ETIMEDOUT : -EILSEQ;
1135
1136                                 if (host->data)
1137                                         omap_hsmmc_dma_cleanup(host, err);
1138                                 else
1139                                         host->mrq->cmd->error = err;
1140                                 host->response_busy = 0;
1141                                 omap_hsmmc_reset_controller_fsm(host, SRD);
1142                                 end_trans = 1;
1143                         }
1144                 }
1145                 if (status & CARD_ERR) {
1146                         dev_dbg(mmc_dev(host->mmc),
1147                                 "Ignoring card err CMD%d\n", host->cmd->opcode);
1148                         if (host->cmd)
1149                                 end_cmd = 1;
1150                         if (host->data)
1151                                 end_trans = 1;
1152                 }
1153         }
1154
1155         OMAP_HSMMC_WRITE(host->base, STAT, status);
1156
1157         if (end_cmd || ((status & CC) && host->cmd))
1158                 omap_hsmmc_cmd_done(host, host->cmd);
1159         if ((end_trans || (status & TC)) && host->mrq)
1160                 omap_hsmmc_xfer_done(host, data);
1161 }
1162
1163 /*
1164  * MMC controller IRQ handler
1165  */
1166 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1167 {
1168         struct omap_hsmmc_host *host = dev_id;
1169         int status;
1170
1171         status = OMAP_HSMMC_READ(host->base, STAT);
1172         do {
1173                 omap_hsmmc_do_irq(host, status);
1174                 /* Flush posted write */
1175                 status = OMAP_HSMMC_READ(host->base, STAT);
1176         } while (status & INT_EN_MASK);
1177
1178         return IRQ_HANDLED;
1179 }
1180
1181 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1182 {
1183         unsigned long i;
1184
1185         OMAP_HSMMC_WRITE(host->base, HCTL,
1186                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1187         for (i = 0; i < loops_per_jiffy; i++) {
1188                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1189                         break;
1190                 cpu_relax();
1191         }
1192 }
1193
1194 /*
1195  * Switch MMC interface voltage ... only relevant for MMC1.
1196  *
1197  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1198  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1199  * Some chips, like eMMC ones, use internal transceivers.
1200  */
1201 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1202 {
1203         u32 reg_val = 0;
1204         int ret;
1205
1206         /* Disable the clocks */
1207         pm_runtime_put_sync(host->dev);
1208         if (host->got_dbclk)
1209                 clk_disable(host->dbclk);
1210
1211         /* Turn the power off */
1212         ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
1213
1214         /* Turn the power ON with given VDD 1.8 or 3.0v */
1215         if (!ret)
1216                 ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
1217                                                vdd);
1218         pm_runtime_get_sync(host->dev);
1219         if (host->got_dbclk)
1220                 clk_enable(host->dbclk);
1221
1222         if (ret != 0)
1223                 goto err;
1224
1225         OMAP_HSMMC_WRITE(host->base, HCTL,
1226                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1227         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1228
1229         /*
1230          * If a MMC dual voltage card is detected, the set_ios fn calls
1231          * this fn with VDD bit set for 1.8V. Upon card removal from the
1232          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1233          *
1234          * Cope with a bit of slop in the range ... per data sheets:
1235          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1236          *    but recommended values are 1.71V to 1.89V
1237          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1238          *    but recommended values are 2.7V to 3.3V
1239          *
1240          * Board setup code shouldn't permit anything very out-of-range.
1241          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1242          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1243          */
1244         if ((1 << vdd) <= MMC_VDD_23_24)
1245                 reg_val |= SDVS18;
1246         else
1247                 reg_val |= SDVS30;
1248
1249         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1250         set_sd_bus_power(host);
1251
1252         return 0;
1253 err:
1254         dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1255         return ret;
1256 }
1257
1258 /* Protect the card while the cover is open */
1259 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1260 {
1261         if (!mmc_slot(host).get_cover_state)
1262                 return;
1263
1264         host->reqs_blocked = 0;
1265         if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
1266                 if (host->protect_card) {
1267                         printk(KERN_INFO "%s: cover is closed, "
1268                                          "card is now accessible\n",
1269                                          mmc_hostname(host->mmc));
1270                         host->protect_card = 0;
1271                 }
1272         } else {
1273                 if (!host->protect_card) {
1274                         printk(KERN_INFO "%s: cover is open, "
1275                                          "card is now inaccessible\n",
1276                                          mmc_hostname(host->mmc));
1277                         host->protect_card = 1;
1278                 }
1279         }
1280 }
1281
1282 /*
1283  * Work Item to notify the core about card insertion/removal
1284  */
1285 static void omap_hsmmc_detect(struct work_struct *work)
1286 {
1287         struct omap_hsmmc_host *host =
1288                 container_of(work, struct omap_hsmmc_host, mmc_carddetect_work);
1289         struct omap_mmc_slot_data *slot = &mmc_slot(host);
1290         int carddetect;
1291
1292         if (host->suspended)
1293                 return;
1294
1295         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1296
1297         if (slot->card_detect)
1298                 carddetect = slot->card_detect(host->dev, host->slot_id);
1299         else {
1300                 omap_hsmmc_protect_card(host);
1301                 carddetect = -ENOSYS;
1302         }
1303
1304         if (carddetect)
1305                 mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1306         else
1307                 mmc_detect_change(host->mmc, (HZ * 50) / 1000);
1308 }
1309
1310 /*
1311  * ISR for handling card insertion and removal
1312  */
1313 static irqreturn_t omap_hsmmc_cd_handler(int irq, void *dev_id)
1314 {
1315         struct omap_hsmmc_host *host = (struct omap_hsmmc_host *)dev_id;
1316
1317         if (host->suspended)
1318                 return IRQ_HANDLED;
1319         schedule_work(&host->mmc_carddetect_work);
1320
1321         return IRQ_HANDLED;
1322 }
1323
1324 static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host,
1325                                      struct mmc_data *data)
1326 {
1327         int sync_dev;
1328
1329         if (data->flags & MMC_DATA_WRITE)
1330                 sync_dev = host->dma_line_tx;
1331         else
1332                 sync_dev = host->dma_line_rx;
1333         return sync_dev;
1334 }
1335
1336 static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host,
1337                                        struct mmc_data *data,
1338                                        struct scatterlist *sgl)
1339 {
1340         int blksz, nblk, dma_ch;
1341
1342         dma_ch = host->dma_ch;
1343         if (data->flags & MMC_DATA_WRITE) {
1344                 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1345                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1346                 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1347                         sg_dma_address(sgl), 0, 0);
1348         } else {
1349                 omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT,
1350                         (host->mapbase + OMAP_HSMMC_DATA), 0, 0);
1351                 omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
1352                         sg_dma_address(sgl), 0, 0);
1353         }
1354
1355         blksz = host->data->blksz;
1356         nblk = sg_dma_len(sgl) / blksz;
1357
1358         omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32,
1359                         blksz / 4, nblk, OMAP_DMA_SYNC_FRAME,
1360                         omap_hsmmc_get_dma_sync_dev(host, data),
1361                         !(data->flags & MMC_DATA_WRITE));
1362
1363         omap_start_dma(dma_ch);
1364 }
1365
1366 /*
1367  * DMA call back function
1368  */
1369 static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data)
1370 {
1371         struct omap_hsmmc_host *host = cb_data;
1372         struct mmc_data *data;
1373         int dma_ch, req_in_progress;
1374
1375         if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) {
1376                 dev_warn(mmc_dev(host->mmc), "unexpected dma status %x\n",
1377                         ch_status);
1378                 return;
1379         }
1380
1381         spin_lock(&host->irq_lock);
1382         if (host->dma_ch < 0) {
1383                 spin_unlock(&host->irq_lock);
1384                 return;
1385         }
1386
1387         data = host->mrq->data;
1388         host->dma_sg_idx++;
1389         if (host->dma_sg_idx < host->dma_len) {
1390                 /* Fire up the next transfer. */
1391                 omap_hsmmc_config_dma_params(host, data,
1392                                            data->sg + host->dma_sg_idx);
1393                 spin_unlock(&host->irq_lock);
1394                 return;
1395         }
1396
1397         if (!data->host_cookie)
1398                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1399                              omap_hsmmc_get_dma_dir(host, data));
1400
1401         req_in_progress = host->req_in_progress;
1402         dma_ch = host->dma_ch;
1403         host->dma_ch = -1;
1404         spin_unlock(&host->irq_lock);
1405
1406         omap_free_dma(dma_ch);
1407
1408         /* If DMA has finished after TC, complete the request */
1409         if (!req_in_progress) {
1410                 struct mmc_request *mrq = host->mrq;
1411
1412                 host->mrq = NULL;
1413                 mmc_request_done(host->mmc, mrq);
1414         }
1415 }
1416
1417 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1418                                        struct mmc_data *data,
1419                                        struct omap_hsmmc_next *next)
1420 {
1421         int dma_len;
1422
1423         if (!next && data->host_cookie &&
1424             data->host_cookie != host->next_data.cookie) {
1425                 printk(KERN_WARNING "[%s] invalid cookie: data->host_cookie %d"
1426                        " host->next_data.cookie %d\n",
1427                        __func__, data->host_cookie, host->next_data.cookie);
1428                 data->host_cookie = 0;
1429         }
1430
1431         /* Check if next job is already prepared */
1432         if (next ||
1433             (!next && data->host_cookie != host->next_data.cookie)) {
1434                 dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg,
1435                                      data->sg_len,
1436                                      omap_hsmmc_get_dma_dir(host, data));
1437
1438         } else {
1439                 dma_len = host->next_data.dma_len;
1440                 host->next_data.dma_len = 0;
1441         }
1442
1443
1444         if (dma_len == 0)
1445                 return -EINVAL;
1446
1447         if (next) {
1448                 next->dma_len = dma_len;
1449                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1450         } else
1451                 host->dma_len = dma_len;
1452
1453         return 0;
1454 }
1455
1456 /*
1457  * Routine to configure and start DMA for the MMC card
1458  */
1459 static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host,
1460                                         struct mmc_request *req)
1461 {
1462         int dma_ch = 0, ret = 0, i;
1463         struct mmc_data *data = req->data;
1464
1465         /* Sanity check: all the SG entries must be aligned by block size. */
1466         for (i = 0; i < data->sg_len; i++) {
1467                 struct scatterlist *sgl;
1468
1469                 sgl = data->sg + i;
1470                 if (sgl->length % data->blksz)
1471                         return -EINVAL;
1472         }
1473         if ((data->blksz % 4) != 0)
1474                 /* REVISIT: The MMC buffer increments only when MSB is written.
1475                  * Return error for blksz which is non multiple of four.
1476                  */
1477                 return -EINVAL;
1478
1479         BUG_ON(host->dma_ch != -1);
1480
1481         ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data),
1482                                "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch);
1483         if (ret != 0) {
1484                 dev_err(mmc_dev(host->mmc),
1485                         "%s: omap_request_dma() failed with %d\n",
1486                         mmc_hostname(host->mmc), ret);
1487                 return ret;
1488         }
1489         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL);
1490         if (ret)
1491                 return ret;
1492
1493         host->dma_ch = dma_ch;
1494         host->dma_sg_idx = 0;
1495
1496         omap_hsmmc_config_dma_params(host, data, data->sg);
1497
1498         return 0;
1499 }
1500
1501 static void set_data_timeout(struct omap_hsmmc_host *host,
1502                              unsigned int timeout_ns,
1503                              unsigned int timeout_clks)
1504 {
1505         unsigned int timeout, cycle_ns;
1506         uint32_t reg, clkd, dto = 0;
1507
1508         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1509         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1510         if (clkd == 0)
1511                 clkd = 1;
1512
1513         cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd);
1514         timeout = timeout_ns / cycle_ns;
1515         timeout += timeout_clks;
1516         if (timeout) {
1517                 while ((timeout & 0x80000000) == 0) {
1518                         dto += 1;
1519                         timeout <<= 1;
1520                 }
1521                 dto = 31 - dto;
1522                 timeout <<= 1;
1523                 if (timeout && dto)
1524                         dto += 1;
1525                 if (dto >= 13)
1526                         dto -= 13;
1527                 else
1528                         dto = 0;
1529                 if (dto > 14)
1530                         dto = 14;
1531         }
1532
1533         reg &= ~DTO_MASK;
1534         reg |= dto << DTO_SHIFT;
1535         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1536 }
1537
1538 /*
1539  * Configure block length for MMC/SD cards and initiate the transfer.
1540  */
1541 static int
1542 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1543 {
1544         int ret;
1545         host->data = req->data;
1546
1547         if (req->data == NULL) {
1548                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1549                 /*
1550                  * Set an arbitrary 100ms data timeout for commands with
1551                  * busy signal.
1552                  */
1553                 if (req->cmd->flags & MMC_RSP_BUSY)
1554                         set_data_timeout(host, 100000000U, 0);
1555                 return 0;
1556         }
1557
1558         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1559                                         | (req->data->blocks << 16));
1560         set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks);
1561
1562         if (host->use_dma) {
1563                 ret = omap_hsmmc_start_dma_transfer(host, req);
1564                 if (ret != 0) {
1565                         dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n");
1566                         return ret;
1567                 }
1568         }
1569         return 0;
1570 }
1571
1572 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1573                                 int err)
1574 {
1575         struct omap_hsmmc_host *host = mmc_priv(mmc);
1576         struct mmc_data *data = mrq->data;
1577
1578         if (host->use_dma) {
1579                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
1580                              omap_hsmmc_get_dma_dir(host, data));
1581                 data->host_cookie = 0;
1582         }
1583 }
1584
1585 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
1586                                bool is_first_req)
1587 {
1588         struct omap_hsmmc_host *host = mmc_priv(mmc);
1589
1590         if (mrq->data->host_cookie) {
1591                 mrq->data->host_cookie = 0;
1592                 return ;
1593         }
1594
1595         if (host->use_dma)
1596                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1597                                                 &host->next_data))
1598                         mrq->data->host_cookie = 0;
1599 }
1600
1601 /*
1602  * Request function. for read/write operation
1603  */
1604 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1605 {
1606         struct omap_hsmmc_host *host = mmc_priv(mmc);
1607         int err;
1608
1609         BUG_ON(host->req_in_progress);
1610         BUG_ON(host->dma_ch != -1);
1611         if (host->protect_card) {
1612                 if (host->reqs_blocked < 3) {
1613                         /*
1614                          * Ensure the controller is left in a consistent
1615                          * state by resetting the command and data state
1616                          * machines.
1617                          */
1618                         omap_hsmmc_reset_controller_fsm(host, SRD);
1619                         omap_hsmmc_reset_controller_fsm(host, SRC);
1620                         host->reqs_blocked += 1;
1621                 }
1622                 req->cmd->error = -EBADF;
1623                 if (req->data)
1624                         req->data->error = -EBADF;
1625                 req->cmd->retries = 0;
1626                 mmc_request_done(mmc, req);
1627                 return;
1628         } else if (host->reqs_blocked)
1629                 host->reqs_blocked = 0;
1630         WARN_ON(host->mrq != NULL);
1631         host->mrq = req;
1632         err = omap_hsmmc_prepare_data(host, req);
1633         if (err) {
1634                 req->cmd->error = err;
1635                 if (req->data)
1636                         req->data->error = err;
1637                 host->mrq = NULL;
1638                 mmc_request_done(mmc, req);
1639                 return;
1640         }
1641
1642         omap_hsmmc_start_command(host, req->cmd, req->data);
1643 }
1644
1645 /* Routine to configure clock values. Exposed API to core */
1646 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1647 {
1648         struct omap_hsmmc_host *host = mmc_priv(mmc);
1649         int do_send_init_stream = 0;
1650
1651         pm_runtime_get_sync(host->dev);
1652
1653         if (ios->power_mode != host->power_mode) {
1654                 switch (ios->power_mode) {
1655                 case MMC_POWER_OFF:
1656                         mmc_slot(host).set_power(host->dev, host->slot_id,
1657                                                  0, 0);
1658                         host->vdd = 0;
1659                         break;
1660                 case MMC_POWER_UP:
1661                         mmc_slot(host).set_power(host->dev, host->slot_id,
1662                                                  1, ios->vdd);
1663                         host->vdd = ios->vdd;
1664                         break;
1665                 case MMC_POWER_ON:
1666                         do_send_init_stream = 1;
1667                         break;
1668                 }
1669                 host->power_mode = ios->power_mode;
1670         }
1671
1672         /* FIXME: set registers based only on changes to ios */
1673
1674         omap_hsmmc_set_bus_width(host);
1675
1676         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1677                 /* Only MMC1 can interface at 3V without some flavor
1678                  * of external transceiver; but they all handle 1.8V.
1679                  */
1680                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1681                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1682                                 /*
1683                                  * The mmc_select_voltage fn of the core does
1684                                  * not seem to set the power_mode to
1685                                  * MMC_POWER_UP upon recalculating the voltage.
1686                                  * vdd 1.8v.
1687                                  */
1688                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1689                                 dev_dbg(mmc_dev(host->mmc),
1690                                                 "Switch operation failed\n");
1691                 }
1692         }
1693
1694         omap_hsmmc_set_clock(host);
1695
1696         if (do_send_init_stream)
1697                 send_init_stream(host);
1698
1699         omap_hsmmc_set_bus_mode(host);
1700
1701         pm_runtime_put_autosuspend(host->dev);
1702 }
1703
1704 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1705 {
1706         struct omap_hsmmc_host *host = mmc_priv(mmc);
1707
1708         if (!mmc_slot(host).card_detect)
1709                 return -ENOSYS;
1710         return mmc_slot(host).card_detect(host->dev, host->slot_id);
1711 }
1712
1713 static int omap_hsmmc_get_ro(struct mmc_host *mmc)
1714 {
1715         struct omap_hsmmc_host *host = mmc_priv(mmc);
1716
1717         if (!mmc_slot(host).get_ro)
1718                 return -ENOSYS;
1719         return mmc_slot(host).get_ro(host->dev, 0);
1720 }
1721
1722 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1723 {
1724         struct omap_hsmmc_host *host = mmc_priv(mmc);
1725
1726         if (mmc_slot(host).init_card)
1727                 mmc_slot(host).init_card(card);
1728 }
1729
1730 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1731 {
1732         u32 hctl, capa, value;
1733
1734         /* Only MMC1 supports 3.0V */
1735         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1736                 hctl = SDVS30;
1737                 capa = VS30 | VS18;
1738         } else {
1739                 hctl = SDVS18;
1740                 capa = VS18;
1741         }
1742
1743         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1744         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1745
1746         value = OMAP_HSMMC_READ(host->base, CAPA);
1747         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1748
1749         /* Set the controller to AUTO IDLE mode */
1750         value = OMAP_HSMMC_READ(host->base, SYSCONFIG);
1751         OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE);
1752
1753         /* Set SD bus power bit */
1754         set_sd_bus_power(host);
1755 }
1756
1757 static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
1758 {
1759         struct omap_hsmmc_host *host = mmc_priv(mmc);
1760
1761         pm_runtime_get_sync(host->dev);
1762
1763         return 0;
1764 }
1765
1766 static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
1767 {
1768         struct omap_hsmmc_host *host = mmc_priv(mmc);
1769
1770         pm_runtime_mark_last_busy(host->dev);
1771         pm_runtime_put_autosuspend(host->dev);
1772
1773         return 0;
1774 }
1775
1776 static const struct mmc_host_ops omap_hsmmc_ops = {
1777         .enable = omap_hsmmc_enable_fclk,
1778         .disable = omap_hsmmc_disable_fclk,
1779         .post_req = omap_hsmmc_post_req,
1780         .pre_req = omap_hsmmc_pre_req,
1781         .request = omap_hsmmc_request,
1782         .set_ios = omap_hsmmc_set_ios,
1783         .get_cd = omap_hsmmc_get_cd,
1784         .get_ro = omap_hsmmc_get_ro,
1785         .init_card = omap_hsmmc_init_card,
1786         /* NYET -- enable_sdio_irq */
1787 };
1788
1789 #ifdef CONFIG_DEBUG_FS
1790
1791 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1792 {
1793         struct mmc_host *mmc = s->private;
1794         struct omap_hsmmc_host *host = mmc_priv(mmc);
1795         int context_loss = 0;
1796
1797         if (host->pdata->get_context_loss_count)
1798                 context_loss = host->pdata->get_context_loss_count(host->dev);
1799
1800         seq_printf(s, "mmc%d:\n"
1801                         " enabled:\t%d\n"
1802                         " dpm_state:\t%d\n"
1803                         " nesting_cnt:\t%d\n"
1804                         " ctx_loss:\t%d:%d\n"
1805                         "\nregs:\n",
1806                         mmc->index, mmc->enabled ? 1 : 0,
1807                         host->dpm_state, mmc->nesting_cnt,
1808                         host->context_loss, context_loss);
1809
1810         if (host->suspended) {
1811                 seq_printf(s, "host suspended, can't read registers\n");
1812                 return 0;
1813         }
1814
1815         pm_runtime_get_sync(host->dev);
1816
1817         seq_printf(s, "SYSCONFIG:\t0x%08x\n",
1818                         OMAP_HSMMC_READ(host->base, SYSCONFIG));
1819         seq_printf(s, "CON:\t\t0x%08x\n",
1820                         OMAP_HSMMC_READ(host->base, CON));
1821         seq_printf(s, "HCTL:\t\t0x%08x\n",
1822                         OMAP_HSMMC_READ(host->base, HCTL));
1823         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1824                         OMAP_HSMMC_READ(host->base, SYSCTL));
1825         seq_printf(s, "IE:\t\t0x%08x\n",
1826                         OMAP_HSMMC_READ(host->base, IE));
1827         seq_printf(s, "ISE:\t\t0x%08x\n",
1828                         OMAP_HSMMC_READ(host->base, ISE));
1829         seq_printf(s, "CAPA:\t\t0x%08x\n",
1830                         OMAP_HSMMC_READ(host->base, CAPA));
1831
1832         pm_runtime_mark_last_busy(host->dev);
1833         pm_runtime_put_autosuspend(host->dev);
1834
1835         return 0;
1836 }
1837
1838 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1839 {
1840         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1841 }
1842
1843 static const struct file_operations mmc_regs_fops = {
1844         .open           = omap_hsmmc_regs_open,
1845         .read           = seq_read,
1846         .llseek         = seq_lseek,
1847         .release        = single_release,
1848 };
1849
1850 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1851 {
1852         if (mmc->debugfs_root)
1853                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1854                         mmc, &mmc_regs_fops);
1855 }
1856
1857 #else
1858
1859 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1860 {
1861 }
1862
1863 #endif
1864
1865 static int __init omap_hsmmc_probe(struct platform_device *pdev)
1866 {
1867         struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
1868         struct mmc_host *mmc;
1869         struct omap_hsmmc_host *host = NULL;
1870         struct resource *res;
1871         int ret, irq;
1872
1873         if (pdata == NULL) {
1874                 dev_err(&pdev->dev, "Platform Data is missing\n");
1875                 return -ENXIO;
1876         }
1877
1878         if (pdata->nr_slots == 0) {
1879                 dev_err(&pdev->dev, "No Slots\n");
1880                 return -ENXIO;
1881         }
1882
1883         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1884         irq = platform_get_irq(pdev, 0);
1885         if (res == NULL || irq < 0)
1886                 return -ENXIO;
1887
1888         res->start += pdata->reg_offset;
1889         res->end += pdata->reg_offset;
1890         res = request_mem_region(res->start, resource_size(res), pdev->name);
1891         if (res == NULL)
1892                 return -EBUSY;
1893
1894         ret = omap_hsmmc_gpio_init(pdata);
1895         if (ret)
1896                 goto err;
1897
1898         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
1899         if (!mmc) {
1900                 ret = -ENOMEM;
1901                 goto err_alloc;
1902         }
1903
1904         host            = mmc_priv(mmc);
1905         host->mmc       = mmc;
1906         host->pdata     = pdata;
1907         host->dev       = &pdev->dev;
1908         host->use_dma   = 1;
1909         host->dev->dma_mask = &pdata->dma_mask;
1910         host->dma_ch    = -1;
1911         host->irq       = irq;
1912         host->id        = pdev->id;
1913         host->slot_id   = 0;
1914         host->mapbase   = res->start;
1915         host->base      = ioremap(host->mapbase, SZ_4K);
1916         host->power_mode = MMC_POWER_OFF;
1917         host->next_data.cookie = 1;
1918
1919         platform_set_drvdata(pdev, host);
1920         INIT_WORK(&host->mmc_carddetect_work, omap_hsmmc_detect);
1921
1922         mmc->ops        = &omap_hsmmc_ops;
1923
1924         /*
1925          * If regulator_disable can only put vcc_aux to sleep then there is
1926          * no off state.
1927          */
1928         if (mmc_slot(host).vcc_aux_disable_is_sleep)
1929                 mmc_slot(host).no_off = 1;
1930
1931         mmc->f_min      = OMAP_MMC_MIN_CLOCK;
1932         mmc->f_max      = OMAP_MMC_MAX_CLOCK;
1933
1934         spin_lock_init(&host->irq_lock);
1935
1936         host->fclk = clk_get(&pdev->dev, "fck");
1937         if (IS_ERR(host->fclk)) {
1938                 ret = PTR_ERR(host->fclk);
1939                 host->fclk = NULL;
1940                 goto err1;
1941         }
1942
1943         omap_hsmmc_context_save(host);
1944
1945         mmc->caps |= MMC_CAP_DISABLE;
1946
1947         pm_runtime_enable(host->dev);
1948         pm_runtime_get_sync(host->dev);
1949         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
1950         pm_runtime_use_autosuspend(host->dev);
1951
1952         if (cpu_is_omap2430()) {
1953                 host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
1954                 /*
1955                  * MMC can still work without debounce clock.
1956                  */
1957                 if (IS_ERR(host->dbclk))
1958                         dev_warn(mmc_dev(host->mmc),
1959                                 "Failed to get debounce clock\n");
1960                 else
1961                         host->got_dbclk = 1;
1962
1963                 if (host->got_dbclk)
1964                         if (clk_enable(host->dbclk) != 0)
1965                                 dev_dbg(mmc_dev(host->mmc), "Enabling debounce"
1966                                                         " clk failed\n");
1967         }
1968
1969         /* Since we do only SG emulation, we can have as many segs
1970          * as we want. */
1971         mmc->max_segs = 1024;
1972
1973         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
1974         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
1975         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
1976         mmc->max_seg_size = mmc->max_req_size;
1977
1978         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1979                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
1980
1981         mmc->caps |= mmc_slot(host).caps;
1982         if (mmc->caps & MMC_CAP_8_BIT_DATA)
1983                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1984
1985         if (mmc_slot(host).nonremovable)
1986                 mmc->caps |= MMC_CAP_NONREMOVABLE;
1987
1988         omap_hsmmc_conf_bus_power(host);
1989
1990         /* Select DMA lines */
1991         switch (host->id) {
1992         case OMAP_MMC1_DEVID:
1993                 host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
1994                 host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
1995                 break;
1996         case OMAP_MMC2_DEVID:
1997                 host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
1998                 host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
1999                 break;
2000         case OMAP_MMC3_DEVID:
2001                 host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
2002                 host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
2003                 break;
2004         case OMAP_MMC4_DEVID:
2005                 host->dma_line_tx = OMAP44XX_DMA_MMC4_TX;
2006                 host->dma_line_rx = OMAP44XX_DMA_MMC4_RX;
2007                 break;
2008         case OMAP_MMC5_DEVID:
2009                 host->dma_line_tx = OMAP44XX_DMA_MMC5_TX;
2010                 host->dma_line_rx = OMAP44XX_DMA_MMC5_RX;
2011                 break;
2012         default:
2013                 dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
2014                 goto err_irq;
2015         }
2016
2017         /* Request IRQ for MMC operations */
2018         ret = request_irq(host->irq, omap_hsmmc_irq, IRQF_DISABLED,
2019                         mmc_hostname(mmc), host);
2020         if (ret) {
2021                 dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2022                 goto err_irq;
2023         }
2024
2025         if (pdata->init != NULL) {
2026                 if (pdata->init(&pdev->dev) != 0) {
2027                         dev_dbg(mmc_dev(host->mmc),
2028                                 "Unable to configure MMC IRQs\n");
2029                         goto err_irq_cd_init;
2030                 }
2031         }
2032
2033         if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) {
2034                 ret = omap_hsmmc_reg_get(host);
2035                 if (ret)
2036                         goto err_reg;
2037                 host->use_reg = 1;
2038         }
2039
2040         mmc->ocr_avail = mmc_slot(host).ocr_mask;
2041
2042         /* Request IRQ for card detect */
2043         if ((mmc_slot(host).card_detect_irq)) {
2044                 ret = request_irq(mmc_slot(host).card_detect_irq,
2045                                   omap_hsmmc_cd_handler,
2046                                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
2047                                           | IRQF_DISABLED,
2048                                   mmc_hostname(mmc), host);
2049                 if (ret) {
2050                         dev_dbg(mmc_dev(host->mmc),
2051                                 "Unable to grab MMC CD IRQ\n");
2052                         goto err_irq_cd;
2053                 }
2054                 pdata->suspend = omap_hsmmc_suspend_cdirq;
2055                 pdata->resume = omap_hsmmc_resume_cdirq;
2056         }
2057
2058         omap_hsmmc_disable_irq(host);
2059
2060         omap_hsmmc_protect_card(host);
2061
2062         mmc_add_host(mmc);
2063
2064         if (mmc_slot(host).name != NULL) {
2065                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2066                 if (ret < 0)
2067                         goto err_slot_name;
2068         }
2069         if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) {
2070                 ret = device_create_file(&mmc->class_dev,
2071                                         &dev_attr_cover_switch);
2072                 if (ret < 0)
2073                         goto err_slot_name;
2074         }
2075
2076         omap_hsmmc_debugfs(mmc);
2077         pm_runtime_mark_last_busy(host->dev);
2078         pm_runtime_put_autosuspend(host->dev);
2079
2080         return 0;
2081
2082 err_slot_name:
2083         mmc_remove_host(mmc);
2084         free_irq(mmc_slot(host).card_detect_irq, host);
2085 err_irq_cd:
2086         if (host->use_reg)
2087                 omap_hsmmc_reg_put(host);
2088 err_reg:
2089         if (host->pdata->cleanup)
2090                 host->pdata->cleanup(&pdev->dev);
2091 err_irq_cd_init:
2092         free_irq(host->irq, host);
2093 err_irq:
2094         pm_runtime_mark_last_busy(host->dev);
2095         pm_runtime_put_autosuspend(host->dev);
2096         clk_put(host->fclk);
2097         if (host->got_dbclk) {
2098                 clk_disable(host->dbclk);
2099                 clk_put(host->dbclk);
2100         }
2101 err1:
2102         iounmap(host->base);
2103         platform_set_drvdata(pdev, NULL);
2104         mmc_free_host(mmc);
2105 err_alloc:
2106         omap_hsmmc_gpio_free(pdata);
2107 err:
2108         release_mem_region(res->start, resource_size(res));
2109         return ret;
2110 }
2111
2112 static int omap_hsmmc_remove(struct platform_device *pdev)
2113 {
2114         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2115         struct resource *res;
2116
2117         if (host) {
2118                 pm_runtime_get_sync(host->dev);
2119                 mmc_remove_host(host->mmc);
2120                 if (host->use_reg)
2121                         omap_hsmmc_reg_put(host);
2122                 if (host->pdata->cleanup)
2123                         host->pdata->cleanup(&pdev->dev);
2124                 free_irq(host->irq, host);
2125                 if (mmc_slot(host).card_detect_irq)
2126                         free_irq(mmc_slot(host).card_detect_irq, host);
2127                 flush_work_sync(&host->mmc_carddetect_work);
2128
2129                 pm_runtime_put_sync(host->dev);
2130                 pm_runtime_disable(host->dev);
2131                 clk_put(host->fclk);
2132                 if (host->got_dbclk) {
2133                         clk_disable(host->dbclk);
2134                         clk_put(host->dbclk);
2135                 }
2136
2137                 mmc_free_host(host->mmc);
2138                 iounmap(host->base);
2139                 omap_hsmmc_gpio_free(pdev->dev.platform_data);
2140         }
2141
2142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2143         if (res)
2144                 release_mem_region(res->start, resource_size(res));
2145         platform_set_drvdata(pdev, NULL);
2146
2147         return 0;
2148 }
2149
2150 #ifdef CONFIG_PM
2151 static int omap_hsmmc_suspend(struct device *dev)
2152 {
2153         int ret = 0;
2154         struct platform_device *pdev = to_platform_device(dev);
2155         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2156
2157         if (host && host->suspended)
2158                 return 0;
2159
2160         if (host) {
2161                 pm_runtime_get_sync(host->dev);
2162                 host->suspended = 1;
2163                 if (host->pdata->suspend) {
2164                         ret = host->pdata->suspend(&pdev->dev,
2165                                                         host->slot_id);
2166                         if (ret) {
2167                                 dev_dbg(mmc_dev(host->mmc),
2168                                         "Unable to handle MMC board"
2169                                         " level suspend\n");
2170                                 host->suspended = 0;
2171                                 return ret;
2172                         }
2173                 }
2174                 cancel_work_sync(&host->mmc_carddetect_work);
2175                 ret = mmc_suspend_host(host->mmc);
2176
2177                 if (ret == 0) {
2178                         omap_hsmmc_disable_irq(host);
2179                         OMAP_HSMMC_WRITE(host->base, HCTL,
2180                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2181                         if (host->got_dbclk)
2182                                 clk_disable(host->dbclk);
2183                 } else {
2184                         host->suspended = 0;
2185                         if (host->pdata->resume) {
2186                                 ret = host->pdata->resume(&pdev->dev,
2187                                                           host->slot_id);
2188                                 if (ret)
2189                                         dev_dbg(mmc_dev(host->mmc),
2190                                                 "Unmask interrupt failed\n");
2191                         }
2192                 }
2193                 pm_runtime_put_sync(host->dev);
2194         }
2195         return ret;
2196 }
2197
2198 /* Routine to resume the MMC device */
2199 static int omap_hsmmc_resume(struct device *dev)
2200 {
2201         int ret = 0;
2202         struct platform_device *pdev = to_platform_device(dev);
2203         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2204
2205         if (host && !host->suspended)
2206                 return 0;
2207
2208         if (host) {
2209                 pm_runtime_get_sync(host->dev);
2210
2211                 if (host->got_dbclk)
2212                         clk_enable(host->dbclk);
2213
2214                 omap_hsmmc_conf_bus_power(host);
2215
2216                 if (host->pdata->resume) {
2217                         ret = host->pdata->resume(&pdev->dev, host->slot_id);
2218                         if (ret)
2219                                 dev_dbg(mmc_dev(host->mmc),
2220                                         "Unmask interrupt failed\n");
2221                 }
2222
2223                 omap_hsmmc_protect_card(host);
2224
2225                 /* Notify the core to resume the host */
2226                 ret = mmc_resume_host(host->mmc);
2227                 if (ret == 0)
2228                         host->suspended = 0;
2229
2230                 pm_runtime_mark_last_busy(host->dev);
2231                 pm_runtime_put_autosuspend(host->dev);
2232         }
2233
2234         return ret;
2235
2236 }
2237
2238 #else
2239 #define omap_hsmmc_suspend      NULL
2240 #define omap_hsmmc_resume               NULL
2241 #endif
2242
2243 static int omap_hsmmc_runtime_suspend(struct device *dev)
2244 {
2245         struct omap_hsmmc_host *host;
2246
2247         host = platform_get_drvdata(to_platform_device(dev));
2248         omap_hsmmc_context_save(host);
2249         dev_dbg(mmc_dev(host->mmc), "disabled\n");
2250
2251         return 0;
2252 }
2253
2254 static int omap_hsmmc_runtime_resume(struct device *dev)
2255 {
2256         struct omap_hsmmc_host *host;
2257
2258         host = platform_get_drvdata(to_platform_device(dev));
2259         omap_hsmmc_context_restore(host);
2260         dev_dbg(mmc_dev(host->mmc), "enabled\n");
2261
2262         return 0;
2263 }
2264
2265 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2266         .suspend        = omap_hsmmc_suspend,
2267         .resume         = omap_hsmmc_resume,
2268         .runtime_suspend = omap_hsmmc_runtime_suspend,
2269         .runtime_resume = omap_hsmmc_runtime_resume,
2270 };
2271
2272 static struct platform_driver omap_hsmmc_driver = {
2273         .remove         = omap_hsmmc_remove,
2274         .driver         = {
2275                 .name = DRIVER_NAME,
2276                 .owner = THIS_MODULE,
2277                 .pm = &omap_hsmmc_dev_pm_ops,
2278         },
2279 };
2280
2281 static int __init omap_hsmmc_init(void)
2282 {
2283         /* Register the MMC driver */
2284         return platform_driver_probe(&omap_hsmmc_driver, omap_hsmmc_probe);
2285 }
2286
2287 static void __exit omap_hsmmc_cleanup(void)
2288 {
2289         /* Unregister MMC driver */
2290         platform_driver_unregister(&omap_hsmmc_driver);
2291 }
2292
2293 module_init(omap_hsmmc_init);
2294 module_exit(omap_hsmmc_cleanup);
2295
2296 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2297 MODULE_LICENSE("GPL");
2298 MODULE_ALIAS("platform:" DRIVER_NAME);
2299 MODULE_AUTHOR("Texas Instruments Inc");