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/dmaengine.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/sizes.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/delay.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/timer.h>
  30 #include <linux/clk.h>
  31 #include <linux/of.h>
  32 #include <linux/of_irq.h>
  33 #include <linux/of_gpio.h>
  34 #include <linux/of_device.h>
  35 #include <linux/mmc/host.h>
  36 #include <linux/mmc/core.h>
  37 #include <linux/mmc/mmc.h>
  38 #include <linux/mmc/slot-gpio.h>
  39 #include <linux/io.h>
  40 #include <linux/irq.h>
  41 #include <linux/gpio.h>
  42 #include <linux/regulator/consumer.h>
  43 #include <linux/pinctrl/consumer.h>
  44 #include <linux/pm_runtime.h>
  45 #include <linux/pm_wakeirq.h>
  46 #include <linux/platform_data/hsmmc-omap.h>
  47
  48 /* OMAP HSMMC Host Controller Registers */
  49 #define OMAP_HSMMC_SYSSTATUS    0x0014
  50 #define OMAP_HSMMC_CON          0x002C
  51 #define OMAP_HSMMC_SDMASA       0x0100
  52 #define OMAP_HSMMC_BLK          0x0104
  53 #define OMAP_HSMMC_ARG          0x0108
  54 #define OMAP_HSMMC_CMD          0x010C
  55 #define OMAP_HSMMC_RSP10        0x0110
  56 #define OMAP_HSMMC_RSP32        0x0114
  57 #define OMAP_HSMMC_RSP54        0x0118
  58 #define OMAP_HSMMC_RSP76        0x011C
  59 #define OMAP_HSMMC_DATA         0x0120
  60 #define OMAP_HSMMC_PSTATE       0x0124
  61 #define OMAP_HSMMC_HCTL         0x0128
  62 #define OMAP_HSMMC_SYSCTL       0x012C
  63 #define OMAP_HSMMC_STAT         0x0130
  64 #define OMAP_HSMMC_IE           0x0134
  65 #define OMAP_HSMMC_ISE          0x0138
  66 #define OMAP_HSMMC_AC12         0x013C
  67 #define OMAP_HSMMC_CAPA         0x0140
  68
  69 #define VS18                    (1 << 26)
  70 #define VS30                    (1 << 25)
  71 #define HSS                     (1 << 21)
  72 #define SDVS18                  (0x5 << 9)
  73 #define SDVS30                  (0x6 << 9)
  74 #define SDVS33                  (0x7 << 9)
  75 #define SDVS_MASK               0x00000E00
  76 #define SDVSCLR                 0xFFFFF1FF
  77 #define SDVSDET                 0x00000400
  78 #define AUTOIDLE                0x1
  79 #define SDBP                    (1 << 8)
  80 #define DTO                     0xe
  81 #define ICE                     0x1
  82 #define ICS                     0x2
  83 #define CEN                     (1 << 2)
  84 #define CLKD_MAX                0x3FF           /* max clock divisor: 1023 */
  85 #define CLKD_MASK               0x0000FFC0
  86 #define CLKD_SHIFT              6
  87 #define DTO_MASK                0x000F0000
  88 #define DTO_SHIFT               16
  89 #define INIT_STREAM             (1 << 1)
  90 #define ACEN_ACMD23             (2 << 2)
  91 #define DP_SELECT               (1 << 21)
  92 #define DDIR                    (1 << 4)
  93 #define DMAE                    0x1
  94 #define MSBS                    (1 << 5)
  95 #define BCE                     (1 << 1)
  96 #define FOUR_BIT                (1 << 1)
  97 #define HSPE                    (1 << 2)
  98 #define IWE                     (1 << 24)
  99 #define DDR                     (1 << 19)
 100 #define CLKEXTFREE              (1 << 16)
 101 #define CTPL                    (1 << 11)
 102 #define DW8                     (1 << 5)
 103 #define OD                      0x1
 104 #define STAT_CLEAR              0xFFFFFFFF
 105 #define INIT_STREAM_CMD         0x00000000
 106 #define DUAL_VOLT_OCR_BIT       7
 107 #define SRC                     (1 << 25)
 108 #define SRD                     (1 << 26)
 109 #define SOFTRESET               (1 << 1)
 110
 111 /* PSTATE */
 112 #define DLEV_DAT(x)             (1 << (20 + (x)))
 113
 114 /* Interrupt masks for IE and ISE register */
 115 #define CC_EN                   (1 << 0)
 116 #define TC_EN                   (1 << 1)
 117 #define BWR_EN                  (1 << 4)
 118 #define BRR_EN                  (1 << 5)
 119 #define CIRQ_EN                 (1 << 8)
 120 #define ERR_EN                  (1 << 15)
 121 #define CTO_EN                  (1 << 16)
 122 #define CCRC_EN                 (1 << 17)
 123 #define CEB_EN                  (1 << 18)
 124 #define CIE_EN                  (1 << 19)
 125 #define DTO_EN                  (1 << 20)
 126 #define DCRC_EN                 (1 << 21)
 127 #define DEB_EN                  (1 << 22)
 128 #define ACE_EN                  (1 << 24)
 129 #define CERR_EN                 (1 << 28)
 130 #define BADA_EN                 (1 << 29)
 131
 132 #define INT_EN_MASK (BADA_EN | CERR_EN | ACE_EN | DEB_EN | DCRC_EN |\
 133                 DTO_EN | CIE_EN | CEB_EN | CCRC_EN | CTO_EN | \
 134                 BRR_EN | BWR_EN | TC_EN | CC_EN)
 135
 136 #define CNI     (1 << 7)
 137 #define ACIE    (1 << 4)
 138 #define ACEB    (1 << 3)
 139 #define ACCE    (1 << 2)
 140 #define ACTO    (1 << 1)
 141 #define ACNE    (1 << 0)
 142
 143 #define MMC_AUTOSUSPEND_DELAY   100
 144 #define MMC_TIMEOUT_MS          20              /* 20 mSec */
 145 #define MMC_TIMEOUT_US          20000           /* 20000 micro Sec */
 146 #define OMAP_MMC_MIN_CLOCK      400000
 147 #define OMAP_MMC_MAX_CLOCK      52000000
 148 #define DRIVER_NAME             "omap_hsmmc"
 149
 150 #define VDD_1V8                 1800000         /* 180000 uV */
 151 #define VDD_3V0                 3000000         /* 300000 uV */
 152 #define VDD_165_195             (ffs(MMC_VDD_165_195) - 1)
 153
 154 /*
 155  * One controller can have multiple slots, like on some omap boards using
 156  * omap.c controller driver. Luckily this is not currently done on any known
 157  * omap_hsmmc.c device.
 158  */
 159 #define mmc_pdata(host)         host->pdata
 160
 161 /*
 162  * MMC Host controller read/write API's
 163  */
 164 #define OMAP_HSMMC_READ(base, reg)      \
 165         __raw_readl((base) + OMAP_HSMMC_##reg)
 166
 167 #define OMAP_HSMMC_WRITE(base, reg, val) \
 168         __raw_writel((val), (base) + OMAP_HSMMC_##reg)
 169
 170 struct omap_hsmmc_next {
 171         unsigned int    dma_len;
 172         s32             cookie;
 173 };
 174
 175 struct omap_hsmmc_host {
 176         struct  device          *dev;
 177         struct  mmc_host        *mmc;
 178         struct  mmc_request     *mrq;
 179         struct  mmc_command     *cmd;
 180         struct  mmc_data        *data;
 181         struct  clk             *fclk;
 182         struct  clk             *dbclk;
 183         struct  regulator       *pbias;
 184         bool                    pbias_enabled;
 185         void    __iomem         *base;
 186         int                     vqmmc_enabled;
 187         resource_size_t         mapbase;
 188         spinlock_t              irq_lock; /* Prevent races with irq handler */
 189         unsigned int            dma_len;
 190         unsigned int            dma_sg_idx;
 191         unsigned char           bus_mode;
 192         unsigned char           power_mode;
 193         int                     suspended;
 194         u32                     con;
 195         u32                     hctl;
 196         u32                     sysctl;
 197         u32                     capa;
 198         int                     irq;
 199         int                     wake_irq;
 200         int                     use_dma, dma_ch;
 201         struct dma_chan         *tx_chan;
 202         struct dma_chan         *rx_chan;
 203         int                     response_busy;
 204         int                     context_loss;
 205         int                     protect_card;
 206         int                     reqs_blocked;
 207         int                     req_in_progress;
 208         unsigned long           clk_rate;
 209         unsigned int            flags;
 210 #define AUTO_CMD23              (1 << 0)        /* Auto CMD23 support */
 211 #define HSMMC_SDIO_IRQ_ENABLED  (1 << 1)        /* SDIO irq enabled */
 212         struct omap_hsmmc_next  next_data;
 213         struct  omap_hsmmc_platform_data        *pdata;
 214
 215         /* return MMC cover switch state, can be NULL if not supported.
 216          *
 217          * possible return values:
 218          *   0 - closed
 219          *   1 - open
 220          */
 221         int (*get_cover_state)(struct device *dev);
 222
 223         int (*card_detect)(struct device *dev);
 224 };
 225
 226 struct omap_mmc_of_data {
 227         u32 reg_offset;
 228         u8 controller_flags;
 229 };
 230
 231 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
 232
 233 static int omap_hsmmc_card_detect(struct device *dev)
 234 {
 235         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 236
 237         return mmc_gpio_get_cd(host->mmc);
 238 }
 239
 240 static int omap_hsmmc_get_cover_state(struct device *dev)
 241 {
 242         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
 243
 244         return mmc_gpio_get_cd(host->mmc);
 245 }
 246
 247 static int omap_hsmmc_enable_supply(struct mmc_host *mmc)
 248 {
 249         int ret;
 250         struct omap_hsmmc_host *host = mmc_priv(mmc);
 251         struct mmc_ios *ios = &mmc->ios;
 252
 253         if (mmc->supply.vmmc) {
 254                 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
 255                 if (ret)
 256                         return ret;
 257         }
 258
 259         /* Enable interface voltage rail, if needed */
 260         if (mmc->supply.vqmmc && !host->vqmmc_enabled) {
 261                 ret = regulator_enable(mmc->supply.vqmmc);
 262                 if (ret) {
 263                         dev_err(mmc_dev(mmc), "vmmc_aux reg enable failed\n");
 264                         goto err_vqmmc;
 265                 }
 266                 host->vqmmc_enabled = 1;
 267         }
 268
 269         return 0;
 270
 271 err_vqmmc:
 272         if (mmc->supply.vmmc)
 273                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
 274
 275         return ret;
 276 }
 277
 278 static int omap_hsmmc_disable_supply(struct mmc_host *mmc)
 279 {
 280         int ret;
 281         int status;
 282         struct omap_hsmmc_host *host = mmc_priv(mmc);
 283
 284         if (mmc->supply.vqmmc && host->vqmmc_enabled) {
 285                 ret = regulator_disable(mmc->supply.vqmmc);
 286                 if (ret) {
 287                         dev_err(mmc_dev(mmc), "vmmc_aux reg disable failed\n");
 288                         return ret;
 289                 }
 290                 host->vqmmc_enabled = 0;
 291         }
 292
 293         if (mmc->supply.vmmc) {
 294                 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
 295                 if (ret)
 296                         goto err_set_ocr;
 297         }
 298
 299         return 0;
 300
 301 err_set_ocr:
 302         if (mmc->supply.vqmmc) {
 303                 status = regulator_enable(mmc->supply.vqmmc);
 304                 if (status)
 305                         dev_err(mmc_dev(mmc), "vmmc_aux re-enable failed\n");
 306         }
 307
 308         return ret;
 309 }
 310
 311 static int omap_hsmmc_set_pbias(struct omap_hsmmc_host *host, bool power_on,
 312                                 int vdd)
 313 {
 314         int ret;
 315
 316         if (!host->pbias)
 317                 return 0;
 318
 319         if (power_on) {
 320                 if (vdd <= VDD_165_195)
 321                         ret = regulator_set_voltage(host->pbias, VDD_1V8,
 322                                                     VDD_1V8);
 323                 else
 324                         ret = regulator_set_voltage(host->pbias, VDD_3V0,
 325                                                     VDD_3V0);
 326                 if (ret < 0) {
 327                         dev_err(host->dev, "pbias set voltage fail\n");
 328                         return ret;
 329                 }
 330
 331                 if (host->pbias_enabled == 0) {
 332                         ret = regulator_enable(host->pbias);
 333                         if (ret) {
 334                                 dev_err(host->dev, "pbias reg enable fail\n");
 335                                 return ret;
 336                         }
 337                         host->pbias_enabled = 1;
 338                 }
 339         } else {
 340                 if (host->pbias_enabled == 1) {
 341                         ret = regulator_disable(host->pbias);
 342                         if (ret) {
 343                                 dev_err(host->dev, "pbias reg disable fail\n");
 344                                 return ret;
 345                         }
 346                         host->pbias_enabled = 0;
 347                 }
 348         }
 349
 350         return 0;
 351 }
 352
 353 static int omap_hsmmc_set_power(struct omap_hsmmc_host *host, int power_on,
 354                                 int vdd)
 355 {
 356         struct mmc_host *mmc = host->mmc;
 357         int ret = 0;
 358
 359         if (mmc_pdata(host)->set_power)
 360                 return mmc_pdata(host)->set_power(host->dev, power_on, vdd);
 361
 362         /*
 363          * If we don't see a Vcc regulator, assume it's a fixed
 364          * voltage always-on regulator.
 365          */
 366         if (!mmc->supply.vmmc)
 367                 return 0;
 368
 369         if (mmc_pdata(host)->before_set_reg)
 370                 mmc_pdata(host)->before_set_reg(host->dev, power_on, vdd);
 371
 372         ret = omap_hsmmc_set_pbias(host, false, 0);
 373         if (ret)
 374                 return ret;
 375
 376         /*
 377          * Assume Vcc regulator is used only to power the card ... OMAP
 378          * VDDS is used to power the pins, optionally with a transceiver to
 379          * support cards using voltages other than VDDS (1.8V nominal).  When a
 380          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 381          *
 382          * In some cases this regulator won't support enable/disable;
 383          * e.g. it's a fixed rail for a WLAN chip.
 384          *
 385          * In other cases vcc_aux switches interface power.  Example, for
 386          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 387          * chips/cards need an interface voltage rail too.
 388          */
 389         if (power_on) {
 390                 ret = omap_hsmmc_enable_supply(mmc);
 391                 if (ret)
 392                         return ret;
 393
 394                 ret = omap_hsmmc_set_pbias(host, true, vdd);
 395                 if (ret)
 396                         goto err_set_voltage;
 397         } else {
 398                 ret = omap_hsmmc_disable_supply(mmc);
 399                 if (ret)
 400                         return ret;
 401         }
 402
 403         if (mmc_pdata(host)->after_set_reg)
 404                 mmc_pdata(host)->after_set_reg(host->dev, power_on, vdd);
 405
 406         return 0;
 407
 408 err_set_voltage:
 409         omap_hsmmc_disable_supply(mmc);
 410
 411         return ret;
 412 }
 413
 414 static int omap_hsmmc_disable_boot_regulator(struct regulator *reg)
 415 {
 416         int ret;
 417
 418         if (!reg)
 419                 return 0;
 420
 421         if (regulator_is_enabled(reg)) {
 422                 ret = regulator_enable(reg);
 423                 if (ret)
 424                         return ret;
 425
 426                 ret = regulator_disable(reg);
 427                 if (ret)
 428                         return ret;
 429         }
 430
 431         return 0;
 432 }
 433
 434 static int omap_hsmmc_disable_boot_regulators(struct omap_hsmmc_host *host)
 435 {
 436         struct mmc_host *mmc = host->mmc;
 437         int ret;
 438
 439         /*
 440          * disable regulators enabled during boot and get the usecount
 441          * right so that regulators can be enabled/disabled by checking
 442          * the return value of regulator_is_enabled
 443          */
 444         ret = omap_hsmmc_disable_boot_regulator(mmc->supply.vmmc);
 445         if (ret) {
 446                 dev_err(host->dev, "fail to disable boot enabled vmmc reg\n");
 447                 return ret;
 448         }
 449
 450         ret = omap_hsmmc_disable_boot_regulator(mmc->supply.vqmmc);
 451         if (ret) {
 452                 dev_err(host->dev,
 453                         "fail to disable boot enabled vmmc_aux reg\n");
 454                 return ret;
 455         }
 456
 457         ret = omap_hsmmc_disable_boot_regulator(host->pbias);
 458         if (ret) {
 459                 dev_err(host->dev,
 460                         "failed to disable boot enabled pbias reg\n");
 461                 return ret;
 462         }
 463
 464         return 0;
 465 }
 466
 467 static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 468 {
 469         int ocr_value = 0;
 470         int ret;
 471         struct mmc_host *mmc = host->mmc;
 472
 473         if (mmc_pdata(host)->set_power)
 474                 return 0;
 475
 476         mmc->supply.vmmc = devm_regulator_get_optional(host->dev, "vmmc");
 477         if (IS_ERR(mmc->supply.vmmc)) {
 478                 ret = PTR_ERR(mmc->supply.vmmc);
 479                 if ((ret != -ENODEV) && host->dev->of_node)
 480                         return ret;
 481                 dev_dbg(host->dev, "unable to get vmmc regulator %ld\n",
 482                         PTR_ERR(mmc->supply.vmmc));
 483                 mmc->supply.vmmc = NULL;
 484         } else {
 485                 ocr_value = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
 486                 if (ocr_value > 0)
 487                         mmc_pdata(host)->ocr_mask = ocr_value;
 488         }
 489
 490         /* Allow an aux regulator */
 491         mmc->supply.vqmmc = devm_regulator_get_optional(host->dev, "vmmc_aux");
 492         if (IS_ERR(mmc->supply.vqmmc)) {
 493                 ret = PTR_ERR(mmc->supply.vqmmc);
 494                 if ((ret != -ENODEV) && host->dev->of_node)
 495                         return ret;
 496                 dev_dbg(host->dev, "unable to get vmmc_aux regulator %ld\n",
 497                         PTR_ERR(mmc->supply.vqmmc));
 498                 mmc->supply.vqmmc = NULL;
 499         }
 500
 501         host->pbias = devm_regulator_get_optional(host->dev, "pbias");
 502         if (IS_ERR(host->pbias)) {
 503                 ret = PTR_ERR(host->pbias);
 504                 if ((ret != -ENODEV) && host->dev->of_node) {
 505                         dev_err(host->dev,
 506                         "SD card detect fail? enable CONFIG_REGULATOR_PBIAS\n");
 507                         return ret;
 508                 }
 509                 dev_dbg(host->dev, "unable to get pbias regulator %ld\n",
 510                         PTR_ERR(host->pbias));
 511                 host->pbias = NULL;
 512         }
 513
 514         /* For eMMC do not power off when not in sleep state */
 515         if (mmc_pdata(host)->no_regulator_off_init)
 516                 return 0;
 517
 518         ret = omap_hsmmc_disable_boot_regulators(host);
 519         if (ret)
 520                 return ret;
 521
 522         return 0;
 523 }
 524
 525 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id);
 526
 527 static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
 528                                 struct omap_hsmmc_host *host,
 529                                 struct omap_hsmmc_platform_data *pdata)
 530 {
 531         int ret;
 532
 533         if (gpio_is_valid(pdata->gpio_cod)) {
 534                 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cod, 0);
 535                 if (ret)
 536                         return ret;
 537
 538                 host->get_cover_state = omap_hsmmc_get_cover_state;
 539                 mmc_gpio_set_cd_isr(mmc, omap_hsmmc_cover_irq);
 540         } else if (gpio_is_valid(pdata->gpio_cd)) {
 541                 ret = mmc_gpio_request_cd(mmc, pdata->gpio_cd, 0);
 542                 if (ret)
 543                         return ret;
 544
 545                 host->card_detect = omap_hsmmc_card_detect;
 546         }
 547
 548         if (gpio_is_valid(pdata->gpio_wp)) {
 549                 ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
 550                 if (ret)
 551                         return ret;
 552         }
 553
 554         return 0;
 555 }
 556
 557 /*
 558  * Start clock to the card
 559  */
 560 static void omap_hsmmc_start_clock(struct omap_hsmmc_host *host)
 561 {
 562         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 563                 OMAP_HSMMC_READ(host->base, SYSCTL) | CEN);
 564 }
 565
 566 /*
 567  * Stop clock to the card
 568  */
 569 static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
 570 {
 571         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 572                 OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN);
 573         if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0)
 574                 dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stopped\n");
 575 }
 576
 577 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
 578                                   struct mmc_command *cmd)
 579 {
 580         u32 irq_mask = INT_EN_MASK;
 581         unsigned long flags;
 582
 583         if (host->use_dma)
 584                 irq_mask &= ~(BRR_EN | BWR_EN);
 585
 586         /* Disable timeout for erases */
 587         if (cmd->opcode == MMC_ERASE)
 588                 irq_mask &= ~DTO_EN;
 589
 590         spin_lock_irqsave(&host->irq_lock, flags);
 591         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 592         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
 593
 594         /* latch pending CIRQ, but don't signal MMC core */
 595         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
 596                 irq_mask |= CIRQ_EN;
 597         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 598         spin_unlock_irqrestore(&host->irq_lock, flags);
 599 }
 600
 601 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
 602 {
 603         u32 irq_mask = 0;
 604         unsigned long flags;
 605
 606         spin_lock_irqsave(&host->irq_lock, flags);
 607         /* no transfer running but need to keep cirq if enabled */
 608         if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
 609                 irq_mask |= CIRQ_EN;
 610         OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
 611         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 612         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 613         spin_unlock_irqrestore(&host->irq_lock, flags);
 614 }
 615
 616 /* Calculate divisor for the given clock frequency */
 617 static u16 calc_divisor(struct omap_hsmmc_host *host, struct mmc_ios *ios)
 618 {
 619         u16 dsor = 0;
 620
 621         if (ios->clock) {
 622                 dsor = DIV_ROUND_UP(clk_get_rate(host->fclk), ios->clock);
 623                 if (dsor > CLKD_MAX)
 624                         dsor = CLKD_MAX;
 625         }
 626
 627         return dsor;
 628 }
 629
 630 static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host)
 631 {
 632         struct mmc_ios *ios = &host->mmc->ios;
 633         unsigned long regval;
 634         unsigned long timeout;
 635         unsigned long clkdiv;
 636
 637         dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock);
 638
 639         omap_hsmmc_stop_clock(host);
 640
 641         regval = OMAP_HSMMC_READ(host->base, SYSCTL);
 642         regval = regval & ~(CLKD_MASK | DTO_MASK);
 643         clkdiv = calc_divisor(host, ios);
 644         regval = regval | (clkdiv << 6) | (DTO << 16);
 645         OMAP_HSMMC_WRITE(host->base, SYSCTL, regval);
 646         OMAP_HSMMC_WRITE(host->base, SYSCTL,
 647                 OMAP_HSMMC_READ(host->base, SYSCTL) | ICE);
 648
 649         /* Wait till the ICS bit is set */
 650         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 651         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS
 652                 && time_before(jiffies, timeout))
 653                 cpu_relax();
 654
 655         /*
 656          * Enable High-Speed Support
 657          * Pre-Requisites
 658          *      - Controller should support High-Speed-Enable Bit
 659          *      - Controller should not be using DDR Mode
 660          *      - Controller should advertise that it supports High Speed
 661          *        in capabilities register
 662          *      - MMC/SD clock coming out of controller > 25MHz
 663          */
 664         if ((mmc_pdata(host)->features & HSMMC_HAS_HSPE_SUPPORT) &&
 665             (ios->timing != MMC_TIMING_MMC_DDR52) &&
 666             (ios->timing != MMC_TIMING_UHS_DDR50) &&
 667             ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) {
 668                 regval = OMAP_HSMMC_READ(host->base, HCTL);
 669                 if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000)
 670                         regval |= HSPE;
 671                 else
 672                         regval &= ~HSPE;
 673
 674                 OMAP_HSMMC_WRITE(host->base, HCTL, regval);
 675         }
 676
 677         omap_hsmmc_start_clock(host);
 678 }
 679
 680 static void omap_hsmmc_set_bus_width(struct omap_hsmmc_host *host)
 681 {
 682         struct mmc_ios *ios = &host->mmc->ios;
 683         u32 con;
 684
 685         con = OMAP_HSMMC_READ(host->base, CON);
 686         if (ios->timing == MMC_TIMING_MMC_DDR52 ||
 687             ios->timing == MMC_TIMING_UHS_DDR50)
 688                 con |= DDR;     /* configure in DDR mode */
 689         else
 690                 con &= ~DDR;
 691         switch (ios->bus_width) {
 692         case MMC_BUS_WIDTH_8:
 693                 OMAP_HSMMC_WRITE(host->base, CON, con | DW8);
 694                 break;
 695         case MMC_BUS_WIDTH_4:
 696                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 697                 OMAP_HSMMC_WRITE(host->base, HCTL,
 698                         OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT);
 699                 break;
 700         case MMC_BUS_WIDTH_1:
 701                 OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8);
 702                 OMAP_HSMMC_WRITE(host->base, HCTL,
 703                         OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT);
 704                 break;
 705         }
 706 }
 707
 708 static void omap_hsmmc_set_bus_mode(struct omap_hsmmc_host *host)
 709 {
 710         struct mmc_ios *ios = &host->mmc->ios;
 711         u32 con;
 712
 713         con = OMAP_HSMMC_READ(host->base, CON);
 714         if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
 715                 OMAP_HSMMC_WRITE(host->base, CON, con | OD);
 716         else
 717                 OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
 718 }
 719
 720 #ifdef CONFIG_PM
 721
 722 /*
 723  * Restore the MMC host context, if it was lost as result of a
 724  * power state change.
 725  */
 726 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 727 {
 728         struct mmc_ios *ios = &host->mmc->ios;
 729         u32 hctl, capa;
 730         unsigned long timeout;
 731
 732         if (host->con == OMAP_HSMMC_READ(host->base, CON) &&
 733             host->hctl == OMAP_HSMMC_READ(host->base, HCTL) &&
 734             host->sysctl == OMAP_HSMMC_READ(host->base, SYSCTL) &&
 735             host->capa == OMAP_HSMMC_READ(host->base, CAPA))
 736                 return 0;
 737
 738         host->context_loss++;
 739
 740         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
 741                 if (host->power_mode != MMC_POWER_OFF &&
 742                     (1 << ios->vdd) <= MMC_VDD_23_24)
 743                         hctl = SDVS18;
 744                 else
 745                         hctl = SDVS30;
 746                 capa = VS30 | VS18;
 747         } else {
 748                 hctl = SDVS18;
 749                 capa = VS18;
 750         }
 751
 752         if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
 753                 hctl |= IWE;
 754
 755         OMAP_HSMMC_WRITE(host->base, HCTL,
 756                         OMAP_HSMMC_READ(host->base, HCTL) | hctl);
 757
 758         OMAP_HSMMC_WRITE(host->base, CAPA,
 759                         OMAP_HSMMC_READ(host->base, CAPA) | capa);
 760
 761         OMAP_HSMMC_WRITE(host->base, HCTL,
 762                         OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
 763
 764         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 765         while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP
 766                 && time_before(jiffies, timeout))
 767                 ;
 768
 769         OMAP_HSMMC_WRITE(host->base, ISE, 0);
 770         OMAP_HSMMC_WRITE(host->base, IE, 0);
 771         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 772
 773         /* Do not initialize card-specific things if the power is off */
 774         if (host->power_mode == MMC_POWER_OFF)
 775                 goto out;
 776
 777         omap_hsmmc_set_bus_width(host);
 778
 779         omap_hsmmc_set_clock(host);
 780
 781         omap_hsmmc_set_bus_mode(host);
 782
 783 out:
 784         dev_dbg(mmc_dev(host->mmc), "context is restored: restore count %d\n",
 785                 host->context_loss);
 786         return 0;
 787 }
 788
 789 /*
 790  * Save the MMC host context (store the number of power state changes so far).
 791  */
 792 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 793 {
 794         host->con =  OMAP_HSMMC_READ(host->base, CON);
 795         host->hctl = OMAP_HSMMC_READ(host->base, HCTL);
 796         host->sysctl =  OMAP_HSMMC_READ(host->base, SYSCTL);
 797         host->capa = OMAP_HSMMC_READ(host->base, CAPA);
 798 }
 799
 800 #else
 801
 802 static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host)
 803 {
 804         return 0;
 805 }
 806
 807 static void omap_hsmmc_context_save(struct omap_hsmmc_host *host)
 808 {
 809 }
 810
 811 #endif
 812
 813 /*
 814  * Send init stream sequence to card
 815  * before sending IDLE command
 816  */
 817 static void send_init_stream(struct omap_hsmmc_host *host)
 818 {
 819         int reg = 0;
 820         unsigned long timeout;
 821
 822         if (host->protect_card)
 823                 return;
 824
 825         disable_irq(host->irq);
 826
 827         OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK);
 828         OMAP_HSMMC_WRITE(host->base, CON,
 829                 OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
 830         OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD);
 831
 832         timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
 833         while ((reg != CC_EN) && time_before(jiffies, timeout))
 834                 reg = OMAP_HSMMC_READ(host->base, STAT) & CC_EN;
 835
 836         OMAP_HSMMC_WRITE(host->base, CON,
 837                 OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM);
 838
 839         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 840         OMAP_HSMMC_READ(host->base, STAT);
 841
 842         enable_irq(host->irq);
 843 }
 844
 845 static inline
 846 int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host)
 847 {
 848         int r = 1;
 849
 850         if (host->get_cover_state)
 851                 r = host->get_cover_state(host->dev);
 852         return r;
 853 }
 854
 855 static ssize_t
 856 omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr,
 857                            char *buf)
 858 {
 859         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 860         struct omap_hsmmc_host *host = mmc_priv(mmc);
 861
 862         return sprintf(buf, "%s\n",
 863                         omap_hsmmc_cover_is_closed(host) ? "closed" : "open");
 864 }
 865
 866 static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL);
 867
 868 static ssize_t
 869 omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr,
 870                         char *buf)
 871 {
 872         struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev);
 873         struct omap_hsmmc_host *host = mmc_priv(mmc);
 874
 875         return sprintf(buf, "%s\n", mmc_pdata(host)->name);
 876 }
 877
 878 static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL);
 879
 880 /*
 881  * Configure the response type and send the cmd.
 882  */
 883 static void
 884 omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd,
 885         struct mmc_data *data)
 886 {
 887         int cmdreg = 0, resptype = 0, cmdtype = 0;
 888
 889         dev_vdbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n",
 890                 mmc_hostname(host->mmc), cmd->opcode, cmd->arg);
 891         host->cmd = cmd;
 892
 893         omap_hsmmc_enable_irq(host, cmd);
 894
 895         host->response_busy = 0;
 896         if (cmd->flags & MMC_RSP_PRESENT) {
 897                 if (cmd->flags & MMC_RSP_136)
 898                         resptype = 1;
 899                 else if (cmd->flags & MMC_RSP_BUSY) {
 900                         resptype = 3;
 901                         host->response_busy = 1;
 902                 } else
 903                         resptype = 2;
 904         }
 905
 906         /*
 907          * Unlike OMAP1 controller, the cmdtype does not seem to be based on
 908          * ac, bc, adtc, bcr. Only commands ending an open ended transfer need
 909          * a val of 0x3, rest 0x0.
 910          */
 911         if (cmd == host->mrq->stop)
 912                 cmdtype = 0x3;
 913
 914         cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22);
 915
 916         if ((host->flags & AUTO_CMD23) && mmc_op_multi(cmd->opcode) &&
 917             host->mrq->sbc) {
 918                 cmdreg |= ACEN_ACMD23;
 919                 OMAP_HSMMC_WRITE(host->base, SDMASA, host->mrq->sbc->arg);
 920         }
 921         if (data) {
 922                 cmdreg |= DP_SELECT | MSBS | BCE;
 923                 if (data->flags & MMC_DATA_READ)
 924                         cmdreg |= DDIR;
 925                 else
 926                         cmdreg &= ~(DDIR);
 927         }
 928
 929         if (host->use_dma)
 930                 cmdreg |= DMAE;
 931
 932         host->req_in_progress = 1;
 933
 934         OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg);
 935         OMAP_HSMMC_WRITE(host->base, CMD, cmdreg);
 936 }
 937
 938 static struct dma_chan *omap_hsmmc_get_dma_chan(struct omap_hsmmc_host *host,
 939         struct mmc_data *data)
 940 {
 941         return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
 942 }
 943
 944 static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq)
 945 {
 946         int dma_ch;
 947         unsigned long flags;
 948
 949         spin_lock_irqsave(&host->irq_lock, flags);
 950         host->req_in_progress = 0;
 951         dma_ch = host->dma_ch;
 952         spin_unlock_irqrestore(&host->irq_lock, flags);
 953
 954         omap_hsmmc_disable_irq(host);
 955         /* Do not complete the request if DMA is still in progress */
 956         if (mrq->data && host->use_dma && dma_ch != -1)
 957                 return;
 958         host->mrq = NULL;
 959         mmc_request_done(host->mmc, mrq);
 960 }
 961
 962 /*
 963  * Notify the transfer complete to MMC core
 964  */
 965 static void
 966 omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data)
 967 {
 968         if (!data) {
 969                 struct mmc_request *mrq = host->mrq;
 970
 971                 /* TC before CC from CMD6 - don't know why, but it happens */
 972                 if (host->cmd && host->cmd->opcode == 6 &&
 973                     host->response_busy) {
 974                         host->response_busy = 0;
 975                         return;
 976                 }
 977
 978                 omap_hsmmc_request_done(host, mrq);
 979                 return;
 980         }
 981
 982         host->data = NULL;
 983
 984         if (!data->error)
 985                 data->bytes_xfered += data->blocks * (data->blksz);
 986         else
 987                 data->bytes_xfered = 0;
 988
 989         if (data->stop && (data->error || !host->mrq->sbc))
 990                 omap_hsmmc_start_command(host, data->stop, NULL);
 991         else
 992                 omap_hsmmc_request_done(host, data->mrq);
 993 }
 994
 995 /*
 996  * Notify the core about command completion
 997  */
 998 static void
 999 omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd)
1000 {
1001         if (host->mrq->sbc && (host->cmd == host->mrq->sbc) &&
1002             !host->mrq->sbc->error && !(host->flags & AUTO_CMD23)) {
1003                 host->cmd = NULL;
1004                 omap_hsmmc_start_dma_transfer(host);
1005                 omap_hsmmc_start_command(host, host->mrq->cmd,
1006                                                 host->mrq->data);
1007                 return;
1008         }
1009
1010         host->cmd = NULL;
1011
1012         if (cmd->flags & MMC_RSP_PRESENT) {
1013                 if (cmd->flags & MMC_RSP_136) {
1014                         /* response type 2 */
1015                         cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10);
1016                         cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32);
1017                         cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54);
1018                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76);
1019                 } else {
1020                         /* response types 1, 1b, 3, 4, 5, 6 */
1021                         cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10);
1022                 }
1023         }
1024         if ((host->data == NULL && !host->response_busy) || cmd->error)
1025                 omap_hsmmc_request_done(host, host->mrq);
1026 }
1027
1028 /*
1029  * DMA clean up for command errors
1030  */
1031 static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno)
1032 {
1033         int dma_ch;
1034         unsigned long flags;
1035
1036         host->data->error = errno;
1037
1038         spin_lock_irqsave(&host->irq_lock, flags);
1039         dma_ch = host->dma_ch;
1040         host->dma_ch = -1;
1041         spin_unlock_irqrestore(&host->irq_lock, flags);
1042
1043         if (host->use_dma && dma_ch != -1) {
1044                 struct dma_chan *chan = omap_hsmmc_get_dma_chan(host, host->data);
1045
1046                 dmaengine_terminate_all(chan);
1047                 dma_unmap_sg(chan->device->dev,
1048                         host->data->sg, host->data->sg_len,
1049                         mmc_get_dma_dir(host->data));
1050
1051                 host->data->host_cookie = 0;
1052         }
1053         host->data = NULL;
1054 }
1055
1056 /*
1057  * Readable error output
1058  */
1059 #ifdef CONFIG_MMC_DEBUG
1060 static void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host, u32 status)
1061 {
1062         /* --- means reserved bit without definition at documentation */
1063         static const char *omap_hsmmc_status_bits[] = {
1064                 "CC"  , "TC"  , "BGE", "---", "BWR" , "BRR" , "---" , "---" ,
1065                 "CIRQ", "OBI" , "---", "---", "---" , "---" , "---" , "ERRI",
1066                 "CTO" , "CCRC", "CEB", "CIE", "DTO" , "DCRC", "DEB" , "---" ,
1067                 "ACE" , "---" , "---", "---", "CERR", "BADA", "---" , "---"
1068         };
1069         char res[256];
1070         char *buf = res;
1071         int len, i;
1072
1073         len = sprintf(buf, "MMC IRQ 0x%x :", status);
1074         buf += len;
1075
1076         for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++)
1077                 if (status & (1 << i)) {
1078                         len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]);
1079                         buf += len;
1080                 }
1081
1082         dev_vdbg(mmc_dev(host->mmc), "%s\n", res);
1083 }
1084 #else
1085 static inline void omap_hsmmc_dbg_report_irq(struct omap_hsmmc_host *host,
1086                                              u32 status)
1087 {
1088 }
1089 #endif  /* CONFIG_MMC_DEBUG */
1090
1091 /*
1092  * MMC controller internal state machines reset
1093  *
1094  * Used to reset command or data internal state machines, using respectively
1095  *  SRC or SRD bit of SYSCTL register
1096  * Can be called from interrupt context
1097  */
1098 static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host,
1099                                                    unsigned long bit)
1100 {
1101         unsigned long i = 0;
1102         unsigned long limit = MMC_TIMEOUT_US;
1103
1104         OMAP_HSMMC_WRITE(host->base, SYSCTL,
1105                          OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
1106
1107         /*
1108          * OMAP4 ES2 and greater has an updated reset logic.
1109          * Monitor a 0->1 transition first
1110          */
1111         if (mmc_pdata(host)->features & HSMMC_HAS_UPDATED_RESET) {
1112                 while ((!(OMAP_HSMMC_READ(host->base, SYSCTL) & bit))
1113                                         && (i++ < limit))
1114                         udelay(1);
1115         }
1116         i = 0;
1117
1118         while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
1119                 (i++ < limit))
1120                 udelay(1);
1121
1122         if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
1123                 dev_err(mmc_dev(host->mmc),
1124                         "Timeout waiting on controller reset in %s\n",
1125                         __func__);
1126 }
1127
1128 static void hsmmc_command_incomplete(struct omap_hsmmc_host *host,
1129                                         int err, int end_cmd)
1130 {
1131         if (end_cmd) {
1132                 omap_hsmmc_reset_controller_fsm(host, SRC);
1133                 if (host->cmd)
1134                         host->cmd->error = err;
1135         }
1136
1137         if (host->data) {
1138                 omap_hsmmc_reset_controller_fsm(host, SRD);
1139                 omap_hsmmc_dma_cleanup(host, err);
1140         } else if (host->mrq && host->mrq->cmd)
1141                 host->mrq->cmd->error = err;
1142 }
1143
1144 static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
1145 {
1146         struct mmc_data *data;
1147         int end_cmd = 0, end_trans = 0;
1148         int error = 0;
1149
1150         data = host->data;
1151         dev_vdbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status);
1152
1153         if (status & ERR_EN) {
1154                 omap_hsmmc_dbg_report_irq(host, status);
1155
1156                 if (status & (CTO_EN | CCRC_EN | CEB_EN))
1157                         end_cmd = 1;
1158                 if (host->data || host->response_busy) {
1159                         end_trans = !end_cmd;
1160                         host->response_busy = 0;
1161                 }
1162                 if (status & (CTO_EN | DTO_EN))
1163                         hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
1164                 else if (status & (CCRC_EN | DCRC_EN | DEB_EN | CEB_EN |
1165                                    BADA_EN))
1166                         hsmmc_command_incomplete(host, -EILSEQ, end_cmd);
1167
1168                 if (status & ACE_EN) {
1169                         u32 ac12;
1170                         ac12 = OMAP_HSMMC_READ(host->base, AC12);
1171                         if (!(ac12 & ACNE) && host->mrq->sbc) {
1172                                 end_cmd = 1;
1173                                 if (ac12 & ACTO)
1174                                         error =  -ETIMEDOUT;
1175                                 else if (ac12 & (ACCE | ACEB | ACIE))
1176                                         error = -EILSEQ;
1177                                 host->mrq->sbc->error = error;
1178                                 hsmmc_command_incomplete(host, error, end_cmd);
1179                         }
1180                         dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
1181                 }
1182         }
1183
1184         OMAP_HSMMC_WRITE(host->base, STAT, status);
1185         if (end_cmd || ((status & CC_EN) && host->cmd))
1186                 omap_hsmmc_cmd_done(host, host->cmd);
1187         if ((end_trans || (status & TC_EN)) && host->mrq)
1188                 omap_hsmmc_xfer_done(host, data);
1189 }
1190
1191 /*
1192  * MMC controller IRQ handler
1193  */
1194 static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
1195 {
1196         struct omap_hsmmc_host *host = dev_id;
1197         int status;
1198
1199         status = OMAP_HSMMC_READ(host->base, STAT);
1200         while (status & (INT_EN_MASK | CIRQ_EN)) {
1201                 if (host->req_in_progress)
1202                         omap_hsmmc_do_irq(host, status);
1203
1204                 if (status & CIRQ_EN)
1205                         mmc_signal_sdio_irq(host->mmc);
1206
1207                 /* Flush posted write */
1208                 status = OMAP_HSMMC_READ(host->base, STAT);
1209         }
1210
1211         return IRQ_HANDLED;
1212 }
1213
1214 static void set_sd_bus_power(struct omap_hsmmc_host *host)
1215 {
1216         unsigned long i;
1217
1218         OMAP_HSMMC_WRITE(host->base, HCTL,
1219                          OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
1220         for (i = 0; i < loops_per_jiffy; i++) {
1221                 if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
1222                         break;
1223                 cpu_relax();
1224         }
1225 }
1226
1227 /*
1228  * Switch MMC interface voltage ... only relevant for MMC1.
1229  *
1230  * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
1231  * The MMC2 transceiver controls are used instead of DAT4..DAT7.
1232  * Some chips, like eMMC ones, use internal transceivers.
1233  */
1234 static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd)
1235 {
1236         u32 reg_val = 0;
1237         int ret;
1238
1239         /* Disable the clocks */
1240         if (host->dbclk)
1241                 clk_disable_unprepare(host->dbclk);
1242
1243         /* Turn the power off */
1244         ret = omap_hsmmc_set_power(host, 0, 0);
1245
1246         /* Turn the power ON with given VDD 1.8 or 3.0v */
1247         if (!ret)
1248                 ret = omap_hsmmc_set_power(host, 1, vdd);
1249         if (host->dbclk)
1250                 clk_prepare_enable(host->dbclk);
1251
1252         if (ret != 0)
1253                 goto err;
1254
1255         OMAP_HSMMC_WRITE(host->base, HCTL,
1256                 OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
1257         reg_val = OMAP_HSMMC_READ(host->base, HCTL);
1258
1259         /*
1260          * If a MMC dual voltage card is detected, the set_ios fn calls
1261          * this fn with VDD bit set for 1.8V. Upon card removal from the
1262          * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
1263          *
1264          * Cope with a bit of slop in the range ... per data sheets:
1265          *  - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
1266          *    but recommended values are 1.71V to 1.89V
1267          *  - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
1268          *    but recommended values are 2.7V to 3.3V
1269          *
1270          * Board setup code shouldn't permit anything very out-of-range.
1271          * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
1272          * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
1273          */
1274         if ((1 << vdd) <= MMC_VDD_23_24)
1275                 reg_val |= SDVS18;
1276         else
1277                 reg_val |= SDVS30;
1278
1279         OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
1280         set_sd_bus_power(host);
1281
1282         return 0;
1283 err:
1284         dev_err(mmc_dev(host->mmc), "Unable to switch operating voltage\n");
1285         return ret;
1286 }
1287
1288 /* Protect the card while the cover is open */
1289 static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
1290 {
1291         if (!host->get_cover_state)
1292                 return;
1293
1294         host->reqs_blocked = 0;
1295         if (host->get_cover_state(host->dev)) {
1296                 if (host->protect_card) {
1297                         dev_info(host->dev, "%s: cover is closed, "
1298                                          "card is now accessible\n",
1299                                          mmc_hostname(host->mmc));
1300                         host->protect_card = 0;
1301                 }
1302         } else {
1303                 if (!host->protect_card) {
1304                         dev_info(host->dev, "%s: cover is open, "
1305                                          "card is now inaccessible\n",
1306                                          mmc_hostname(host->mmc));
1307                         host->protect_card = 1;
1308                 }
1309         }
1310 }
1311
1312 /*
1313  * irq handler when (cell-phone) cover is mounted/removed
1314  */
1315 static irqreturn_t omap_hsmmc_cover_irq(int irq, void *dev_id)
1316 {
1317         struct omap_hsmmc_host *host = dev_id;
1318
1319         sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
1320
1321         omap_hsmmc_protect_card(host);
1322         mmc_detect_change(host->mmc, (HZ * 200) / 1000);
1323         return IRQ_HANDLED;
1324 }
1325
1326 static void omap_hsmmc_dma_callback(void *param)
1327 {
1328         struct omap_hsmmc_host *host = param;
1329         struct dma_chan *chan;
1330         struct mmc_data *data;
1331         int req_in_progress;
1332
1333         spin_lock_irq(&host->irq_lock);
1334         if (host->dma_ch < 0) {
1335                 spin_unlock_irq(&host->irq_lock);
1336                 return;
1337         }
1338
1339         data = host->mrq->data;
1340         chan = omap_hsmmc_get_dma_chan(host, data);
1341         if (!data->host_cookie)
1342                 dma_unmap_sg(chan->device->dev,
1343                              data->sg, data->sg_len,
1344                              mmc_get_dma_dir(data));
1345
1346         req_in_progress = host->req_in_progress;
1347         host->dma_ch = -1;
1348         spin_unlock_irq(&host->irq_lock);
1349
1350         /* If DMA has finished after TC, complete the request */
1351         if (!req_in_progress) {
1352                 struct mmc_request *mrq = host->mrq;
1353
1354                 host->mrq = NULL;
1355                 mmc_request_done(host->mmc, mrq);
1356         }
1357 }
1358
1359 static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
1360                                        struct mmc_data *data,
1361                                        struct omap_hsmmc_next *next,
1362                                        struct dma_chan *chan)
1363 {
1364         int dma_len;
1365
1366         if (!next && data->host_cookie &&
1367             data->host_cookie != host->next_data.cookie) {
1368                 dev_warn(host->dev, "[%s] invalid cookie: data->host_cookie %d"
1369                        " host->next_data.cookie %d\n",
1370                        __func__, data->host_cookie, host->next_data.cookie);
1371                 data->host_cookie = 0;
1372         }
1373
1374         /* Check if next job is already prepared */
1375         if (next || data->host_cookie != host->next_data.cookie) {
1376                 dma_len = dma_map_sg(chan->device->dev, data->sg, data->sg_len,
1377                                      mmc_get_dma_dir(data));
1378
1379         } else {
1380                 dma_len = host->next_data.dma_len;
1381                 host->next_data.dma_len = 0;
1382         }
1383
1384
1385         if (dma_len == 0)
1386                 return -EINVAL;
1387
1388         if (next) {
1389                 next->dma_len = dma_len;
1390                 data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
1391         } else
1392                 host->dma_len = dma_len;
1393
1394         return 0;
1395 }
1396
1397 /*
1398  * Routine to configure and start DMA for the MMC card
1399  */
1400 static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
1401                                         struct mmc_request *req)
1402 {
1403         struct dma_async_tx_descriptor *tx;
1404         int ret = 0, i;
1405         struct mmc_data *data = req->data;
1406         struct dma_chan *chan;
1407         struct dma_slave_config cfg = {
1408                 .src_addr = host->mapbase + OMAP_HSMMC_DATA,
1409                 .dst_addr = host->mapbase + OMAP_HSMMC_DATA,
1410                 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
1411                 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
1412                 .src_maxburst = data->blksz / 4,
1413                 .dst_maxburst = data->blksz / 4,
1414         };
1415
1416         /* Sanity check: all the SG entries must be aligned by block size. */
1417         for (i = 0; i < data->sg_len; i++) {
1418                 struct scatterlist *sgl;
1419
1420                 sgl = data->sg + i;
1421                 if (sgl->length % data->blksz)
1422                         return -EINVAL;
1423         }
1424         if ((data->blksz % 4) != 0)
1425                 /* REVISIT: The MMC buffer increments only when MSB is written.
1426                  * Return error for blksz which is non multiple of four.
1427                  */
1428                 return -EINVAL;
1429
1430         BUG_ON(host->dma_ch != -1);
1431
1432         chan = omap_hsmmc_get_dma_chan(host, data);
1433
1434         ret = dmaengine_slave_config(chan, &cfg);
1435         if (ret)
1436                 return ret;
1437
1438         ret = omap_hsmmc_pre_dma_transfer(host, data, NULL, chan);
1439         if (ret)
1440                 return ret;
1441
1442         tx = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len,
1443                 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
1444                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1445         if (!tx) {
1446                 dev_err(mmc_dev(host->mmc), "prep_slave_sg() failed\n");
1447                 /* FIXME: cleanup */
1448                 return -1;
1449         }
1450
1451         tx->callback = omap_hsmmc_dma_callback;
1452         tx->callback_param = host;
1453
1454         /* Does not fail */
1455         dmaengine_submit(tx);
1456
1457         host->dma_ch = 1;
1458
1459         return 0;
1460 }
1461
1462 static void set_data_timeout(struct omap_hsmmc_host *host,
1463                              unsigned long long timeout_ns,
1464                              unsigned int timeout_clks)
1465 {
1466         unsigned long long timeout = timeout_ns;
1467         unsigned int cycle_ns;
1468         uint32_t reg, clkd, dto = 0;
1469
1470         reg = OMAP_HSMMC_READ(host->base, SYSCTL);
1471         clkd = (reg & CLKD_MASK) >> CLKD_SHIFT;
1472         if (clkd == 0)
1473                 clkd = 1;
1474
1475         cycle_ns = 1000000000 / (host->clk_rate / clkd);
1476         do_div(timeout, cycle_ns);
1477         timeout += timeout_clks;
1478         if (timeout) {
1479                 while ((timeout & 0x80000000) == 0) {
1480                         dto += 1;
1481                         timeout <<= 1;
1482                 }
1483                 dto = 31 - dto;
1484                 timeout <<= 1;
1485                 if (timeout && dto)
1486                         dto += 1;
1487                 if (dto >= 13)
1488                         dto -= 13;
1489                 else
1490                         dto = 0;
1491                 if (dto > 14)
1492                         dto = 14;
1493         }
1494
1495         reg &= ~DTO_MASK;
1496         reg |= dto << DTO_SHIFT;
1497         OMAP_HSMMC_WRITE(host->base, SYSCTL, reg);
1498 }
1499
1500 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host)
1501 {
1502         struct mmc_request *req = host->mrq;
1503         struct dma_chan *chan;
1504
1505         if (!req->data)
1506                 return;
1507         OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz)
1508                                 | (req->data->blocks << 16));
1509         set_data_timeout(host, req->data->timeout_ns,
1510                                 req->data->timeout_clks);
1511         chan = omap_hsmmc_get_dma_chan(host, req->data);
1512         dma_async_issue_pending(chan);
1513 }
1514
1515 /*
1516  * Configure block length for MMC/SD cards and initiate the transfer.
1517  */
1518 static int
1519 omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req)
1520 {
1521         int ret;
1522         unsigned long long timeout;
1523
1524         host->data = req->data;
1525
1526         if (req->data == NULL) {
1527                 OMAP_HSMMC_WRITE(host->base, BLK, 0);
1528                 if (req->cmd->flags & MMC_RSP_BUSY) {
1529                         timeout = req->cmd->busy_timeout * NSEC_PER_MSEC;
1530
1531                         /*
1532                          * Set an arbitrary 100ms data timeout for commands with
1533                          * busy signal and no indication of busy_timeout.
1534                          */
1535                         if (!timeout)
1536                                 timeout = 100000000U;
1537
1538                         set_data_timeout(host, timeout, 0);
1539                 }
1540                 return 0;
1541         }
1542
1543         if (host->use_dma) {
1544                 ret = omap_hsmmc_setup_dma_transfer(host, req);
1545                 if (ret != 0) {
1546                         dev_err(mmc_dev(host->mmc), "MMC start dma failure\n");
1547                         return ret;
1548                 }
1549         }
1550         return 0;
1551 }
1552
1553 static void omap_hsmmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
1554                                 int err)
1555 {
1556         struct omap_hsmmc_host *host = mmc_priv(mmc);
1557         struct mmc_data *data = mrq->data;
1558
1559         if (host->use_dma && data->host_cookie) {
1560                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, data);
1561
1562                 dma_unmap_sg(c->device->dev, data->sg, data->sg_len,
1563                              mmc_get_dma_dir(data));
1564                 data->host_cookie = 0;
1565         }
1566 }
1567
1568 static void omap_hsmmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
1569 {
1570         struct omap_hsmmc_host *host = mmc_priv(mmc);
1571
1572         if (mrq->data->host_cookie) {
1573                 mrq->data->host_cookie = 0;
1574                 return ;
1575         }
1576
1577         if (host->use_dma) {
1578                 struct dma_chan *c = omap_hsmmc_get_dma_chan(host, mrq->data);
1579
1580                 if (omap_hsmmc_pre_dma_transfer(host, mrq->data,
1581                                                 &host->next_data, c))
1582                         mrq->data->host_cookie = 0;
1583         }
1584 }
1585
1586 /*
1587  * Request function. for read/write operation
1588  */
1589 static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req)
1590 {
1591         struct omap_hsmmc_host *host = mmc_priv(mmc);
1592         int err;
1593
1594         BUG_ON(host->req_in_progress);
1595         BUG_ON(host->dma_ch != -1);
1596         if (host->protect_card) {
1597                 if (host->reqs_blocked < 3) {
1598                         /*
1599                          * Ensure the controller is left in a consistent
1600                          * state by resetting the command and data state
1601                          * machines.
1602                          */
1603                         omap_hsmmc_reset_controller_fsm(host, SRD);
1604                         omap_hsmmc_reset_controller_fsm(host, SRC);
1605                         host->reqs_blocked += 1;
1606                 }
1607                 req->cmd->error = -EBADF;
1608                 if (req->data)
1609                         req->data->error = -EBADF;
1610                 req->cmd->retries = 0;
1611                 mmc_request_done(mmc, req);
1612                 return;
1613         } else if (host->reqs_blocked)
1614                 host->reqs_blocked = 0;
1615         WARN_ON(host->mrq != NULL);
1616         host->mrq = req;
1617         host->clk_rate = clk_get_rate(host->fclk);
1618         err = omap_hsmmc_prepare_data(host, req);
1619         if (err) {
1620                 req->cmd->error = err;
1621                 if (req->data)
1622                         req->data->error = err;
1623                 host->mrq = NULL;
1624                 mmc_request_done(mmc, req);
1625                 return;
1626         }
1627         if (req->sbc && !(host->flags & AUTO_CMD23)) {
1628                 omap_hsmmc_start_command(host, req->sbc, NULL);
1629                 return;
1630         }
1631
1632         omap_hsmmc_start_dma_transfer(host);
1633         omap_hsmmc_start_command(host, req->cmd, req->data);
1634 }
1635
1636 /* Routine to configure clock values. Exposed API to core */
1637 static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1638 {
1639         struct omap_hsmmc_host *host = mmc_priv(mmc);
1640         int do_send_init_stream = 0;
1641
1642         if (ios->power_mode != host->power_mode) {
1643                 switch (ios->power_mode) {
1644                 case MMC_POWER_OFF:
1645                         omap_hsmmc_set_power(host, 0, 0);
1646                         break;
1647                 case MMC_POWER_UP:
1648                         omap_hsmmc_set_power(host, 1, ios->vdd);
1649                         break;
1650                 case MMC_POWER_ON:
1651                         do_send_init_stream = 1;
1652                         break;
1653                 }
1654                 host->power_mode = ios->power_mode;
1655         }
1656
1657         /* FIXME: set registers based only on changes to ios */
1658
1659         omap_hsmmc_set_bus_width(host);
1660
1661         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1662                 /* Only MMC1 can interface at 3V without some flavor
1663                  * of external transceiver; but they all handle 1.8V.
1664                  */
1665                 if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
1666                         (ios->vdd == DUAL_VOLT_OCR_BIT)) {
1667                                 /*
1668                                  * The mmc_select_voltage fn of the core does
1669                                  * not seem to set the power_mode to
1670                                  * MMC_POWER_UP upon recalculating the voltage.
1671                                  * vdd 1.8v.
1672                                  */
1673                         if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0)
1674                                 dev_dbg(mmc_dev(host->mmc),
1675                                                 "Switch operation failed\n");
1676                 }
1677         }
1678
1679         omap_hsmmc_set_clock(host);
1680
1681         if (do_send_init_stream)
1682                 send_init_stream(host);
1683
1684         omap_hsmmc_set_bus_mode(host);
1685 }
1686
1687 static int omap_hsmmc_get_cd(struct mmc_host *mmc)
1688 {
1689         struct omap_hsmmc_host *host = mmc_priv(mmc);
1690
1691         if (!host->card_detect)
1692                 return -ENOSYS;
1693         return host->card_detect(host->dev);
1694 }
1695
1696 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
1697 {
1698         struct omap_hsmmc_host *host = mmc_priv(mmc);
1699
1700         if (mmc_pdata(host)->init_card)
1701                 mmc_pdata(host)->init_card(card);
1702 }
1703
1704 static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
1705 {
1706         struct omap_hsmmc_host *host = mmc_priv(mmc);
1707         u32 irq_mask, con;
1708         unsigned long flags;
1709
1710         spin_lock_irqsave(&host->irq_lock, flags);
1711
1712         con = OMAP_HSMMC_READ(host->base, CON);
1713         irq_mask = OMAP_HSMMC_READ(host->base, ISE);
1714         if (enable) {
1715                 host->flags |= HSMMC_SDIO_IRQ_ENABLED;
1716                 irq_mask |= CIRQ_EN;
1717                 con |= CTPL | CLKEXTFREE;
1718         } else {
1719                 host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
1720                 irq_mask &= ~CIRQ_EN;
1721                 con &= ~(CTPL | CLKEXTFREE);
1722         }
1723         OMAP_HSMMC_WRITE(host->base, CON, con);
1724         OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
1725
1726         /*
1727          * if enable, piggy back detection on current request
1728          * but always disable immediately
1729          */
1730         if (!host->req_in_progress || !enable)
1731                 OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
1732
1733         /* flush posted write */
1734         OMAP_HSMMC_READ(host->base, IE);
1735
1736         spin_unlock_irqrestore(&host->irq_lock, flags);
1737 }
1738
1739 static int omap_hsmmc_configure_wake_irq(struct omap_hsmmc_host *host)
1740 {
1741         int ret;
1742
1743         /*
1744          * For omaps with wake-up path, wakeirq will be irq from pinctrl and
1745          * for other omaps, wakeirq will be from GPIO (dat line remuxed to
1746          * gpio). wakeirq is needed to detect sdio irq in runtime suspend state
1747          * with functional clock disabled.
1748          */
1749         if (!host->dev->of_node || !host->wake_irq)
1750                 return -ENODEV;
1751
1752         ret = dev_pm_set_dedicated_wake_irq(host->dev, host->wake_irq);
1753         if (ret) {
1754                 dev_err(mmc_dev(host->mmc), "Unable to request wake IRQ\n");
1755                 goto err;
1756         }
1757
1758         /*
1759          * Some omaps don't have wake-up path from deeper idle states
1760          * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
1761          */
1762         if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
1763                 struct pinctrl *p = devm_pinctrl_get(host->dev);
1764                 if (IS_ERR(p)) {
1765                         ret = PTR_ERR(p);
1766                         goto err_free_irq;
1767                 }
1768                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_DEFAULT))) {
1769                         dev_info(host->dev, "missing default pinctrl state\n");
1770                         devm_pinctrl_put(p);
1771                         ret = -EINVAL;
1772                         goto err_free_irq;
1773                 }
1774
1775                 if (IS_ERR(pinctrl_lookup_state(p, PINCTRL_STATE_IDLE))) {
1776                         dev_info(host->dev, "missing idle pinctrl state\n");
1777                         devm_pinctrl_put(p);
1778                         ret = -EINVAL;
1779                         goto err_free_irq;
1780                 }
1781                 devm_pinctrl_put(p);
1782         }
1783
1784         OMAP_HSMMC_WRITE(host->base, HCTL,
1785                          OMAP_HSMMC_READ(host->base, HCTL) | IWE);
1786         return 0;
1787
1788 err_free_irq:
1789         dev_pm_clear_wake_irq(host->dev);
1790 err:
1791         dev_warn(host->dev, "no SDIO IRQ support, falling back to polling\n");
1792         host->wake_irq = 0;
1793         return ret;
1794 }
1795
1796 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
1797 {
1798         u32 hctl, capa, value;
1799
1800         /* Only MMC1 supports 3.0V */
1801         if (host->pdata->controller_flags & OMAP_HSMMC_SUPPORTS_DUAL_VOLT) {
1802                 hctl = SDVS30;
1803                 capa = VS30 | VS18;
1804         } else {
1805                 hctl = SDVS18;
1806                 capa = VS18;
1807         }
1808
1809         value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK;
1810         OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl);
1811
1812         value = OMAP_HSMMC_READ(host->base, CAPA);
1813         OMAP_HSMMC_WRITE(host->base, CAPA, value | capa);
1814
1815         /* Set SD bus power bit */
1816         set_sd_bus_power(host);
1817 }
1818
1819 static int omap_hsmmc_multi_io_quirk(struct mmc_card *card,
1820                                      unsigned int direction, int blk_size)
1821 {
1822         /* This controller can't do multiblock reads due to hw bugs */
1823         if (direction == MMC_DATA_READ)
1824                 return 1;
1825
1826         return blk_size;
1827 }
1828
1829 static struct mmc_host_ops omap_hsmmc_ops = {
1830         .post_req = omap_hsmmc_post_req,
1831         .pre_req = omap_hsmmc_pre_req,
1832         .request = omap_hsmmc_request,
1833         .set_ios = omap_hsmmc_set_ios,
1834         .get_cd = omap_hsmmc_get_cd,
1835         .get_ro = mmc_gpio_get_ro,
1836         .init_card = omap_hsmmc_init_card,
1837         .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
1838 };
1839
1840 #ifdef CONFIG_DEBUG_FS
1841
1842 static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
1843 {
1844         struct mmc_host *mmc = s->private;
1845         struct omap_hsmmc_host *host = mmc_priv(mmc);
1846
1847         seq_printf(s, "mmc%d:\n", mmc->index);
1848         seq_printf(s, "sdio irq mode\t%s\n",
1849                    (mmc->caps & MMC_CAP_SDIO_IRQ) ? "interrupt" : "polling");
1850
1851         if (mmc->caps & MMC_CAP_SDIO_IRQ) {
1852                 seq_printf(s, "sdio irq \t%s\n",
1853                            (host->flags & HSMMC_SDIO_IRQ_ENABLED) ?  "enabled"
1854                            : "disabled");
1855         }
1856         seq_printf(s, "ctx_loss:\t%d\n", host->context_loss);
1857
1858         pm_runtime_get_sync(host->dev);
1859         seq_puts(s, "\nregs:\n");
1860         seq_printf(s, "CON:\t\t0x%08x\n",
1861                         OMAP_HSMMC_READ(host->base, CON));
1862         seq_printf(s, "PSTATE:\t\t0x%08x\n",
1863                    OMAP_HSMMC_READ(host->base, PSTATE));
1864         seq_printf(s, "HCTL:\t\t0x%08x\n",
1865                         OMAP_HSMMC_READ(host->base, HCTL));
1866         seq_printf(s, "SYSCTL:\t\t0x%08x\n",
1867                         OMAP_HSMMC_READ(host->base, SYSCTL));
1868         seq_printf(s, "IE:\t\t0x%08x\n",
1869                         OMAP_HSMMC_READ(host->base, IE));
1870         seq_printf(s, "ISE:\t\t0x%08x\n",
1871                         OMAP_HSMMC_READ(host->base, ISE));
1872         seq_printf(s, "CAPA:\t\t0x%08x\n",
1873                         OMAP_HSMMC_READ(host->base, CAPA));
1874
1875         pm_runtime_mark_last_busy(host->dev);
1876         pm_runtime_put_autosuspend(host->dev);
1877
1878         return 0;
1879 }
1880
1881 static int omap_hsmmc_regs_open(struct inode *inode, struct file *file)
1882 {
1883         return single_open(file, omap_hsmmc_regs_show, inode->i_private);
1884 }
1885
1886 static const struct file_operations mmc_regs_fops = {
1887         .open           = omap_hsmmc_regs_open,
1888         .read           = seq_read,
1889         .llseek         = seq_lseek,
1890         .release        = single_release,
1891 };
1892
1893 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1894 {
1895         if (mmc->debugfs_root)
1896                 debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root,
1897                         mmc, &mmc_regs_fops);
1898 }
1899
1900 #else
1901
1902 static void omap_hsmmc_debugfs(struct mmc_host *mmc)
1903 {
1904 }
1905
1906 #endif
1907
1908 #ifdef CONFIG_OF
1909 static const struct omap_mmc_of_data omap3_pre_es3_mmc_of_data = {
1910         /* See 35xx errata 2.1.1.128 in SPRZ278F */
1911         .controller_flags = OMAP_HSMMC_BROKEN_MULTIBLOCK_READ,
1912 };
1913
1914 static const struct omap_mmc_of_data omap4_mmc_of_data = {
1915         .reg_offset = 0x100,
1916 };
1917 static const struct omap_mmc_of_data am33xx_mmc_of_data = {
1918         .reg_offset = 0x100,
1919         .controller_flags = OMAP_HSMMC_SWAKEUP_MISSING,
1920 };
1921
1922 static const struct of_device_id omap_mmc_of_match[] = {
1923         {
1924                 .compatible = "ti,omap2-hsmmc",
1925         },
1926         {
1927                 .compatible = "ti,omap3-pre-es3-hsmmc",
1928                 .data = &omap3_pre_es3_mmc_of_data,
1929         },
1930         {
1931                 .compatible = "ti,omap3-hsmmc",
1932         },
1933         {
1934                 .compatible = "ti,omap4-hsmmc",
1935                 .data = &omap4_mmc_of_data,
1936         },
1937         {
1938                 .compatible = "ti,am33xx-hsmmc",
1939                 .data = &am33xx_mmc_of_data,
1940         },
1941         {},
1942 };
1943 MODULE_DEVICE_TABLE(of, omap_mmc_of_match);
1944
1945 static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
1946 {
1947         struct omap_hsmmc_platform_data *pdata, *legacy;
1948         struct device_node *np = dev->of_node;
1949
1950         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
1951         if (!pdata)
1952                 return ERR_PTR(-ENOMEM); /* out of memory */
1953
1954         legacy = dev_get_platdata(dev);
1955         if (legacy && legacy->name)
1956                 pdata->name = legacy->name;
1957
1958         if (of_find_property(np, "ti,dual-volt", NULL))
1959                 pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
1960
1961         pdata->gpio_cd = -EINVAL;
1962         pdata->gpio_cod = -EINVAL;
1963         pdata->gpio_wp = -EINVAL;
1964
1965         if (of_find_property(np, "ti,non-removable", NULL)) {
1966                 pdata->nonremovable = true;
1967                 pdata->no_regulator_off_init = true;
1968         }
1969
1970         if (of_find_property(np, "ti,needs-special-reset", NULL))
1971                 pdata->features |= HSMMC_HAS_UPDATED_RESET;
1972
1973         if (of_find_property(np, "ti,needs-special-hs-handling", NULL))
1974                 pdata->features |= HSMMC_HAS_HSPE_SUPPORT;
1975
1976         return pdata;
1977 }
1978 #else
1979 static inline struct omap_hsmmc_platform_data
1980                         *of_get_hsmmc_pdata(struct device *dev)
1981 {
1982         return ERR_PTR(-EINVAL);
1983 }
1984 #endif
1985
1986 static int omap_hsmmc_probe(struct platform_device *pdev)
1987 {
1988         struct omap_hsmmc_platform_data *pdata = pdev->dev.platform_data;
1989         struct mmc_host *mmc;
1990         struct omap_hsmmc_host *host = NULL;
1991         struct resource *res;
1992         int ret, irq;
1993         const struct of_device_id *match;
1994         const struct omap_mmc_of_data *data;
1995         void __iomem *base;
1996
1997         match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
1998         if (match) {
1999                 pdata = of_get_hsmmc_pdata(&pdev->dev);
2000
2001                 if (IS_ERR(pdata))
2002                         return PTR_ERR(pdata);
2003
2004                 if (match->data) {
2005                         data = match->data;
2006                         pdata->reg_offset = data->reg_offset;
2007                         pdata->controller_flags |= data->controller_flags;
2008                 }
2009         }
2010
2011         if (pdata == NULL) {
2012                 dev_err(&pdev->dev, "Platform Data is missing\n");
2013                 return -ENXIO;
2014         }
2015
2016         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2017         irq = platform_get_irq(pdev, 0);
2018         if (res == NULL || irq < 0)
2019                 return -ENXIO;
2020
2021         base = devm_ioremap_resource(&pdev->dev, res);
2022         if (IS_ERR(base))
2023                 return PTR_ERR(base);
2024
2025         mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev);
2026         if (!mmc) {
2027                 ret = -ENOMEM;
2028                 goto err;
2029         }
2030
2031         ret = mmc_of_parse(mmc);
2032         if (ret)
2033                 goto err1;
2034
2035         host            = mmc_priv(mmc);
2036         host->mmc       = mmc;
2037         host->pdata     = pdata;
2038         host->dev       = &pdev->dev;
2039         host->use_dma   = 1;
2040         host->dma_ch    = -1;
2041         host->irq       = irq;
2042         host->mapbase   = res->start + pdata->reg_offset;
2043         host->base      = base + pdata->reg_offset;
2044         host->power_mode = MMC_POWER_OFF;
2045         host->next_data.cookie = 1;
2046         host->pbias_enabled = 0;
2047         host->vqmmc_enabled = 0;
2048
2049         ret = omap_hsmmc_gpio_init(mmc, host, pdata);
2050         if (ret)
2051                 goto err_gpio;
2052
2053         platform_set_drvdata(pdev, host);
2054
2055         if (pdev->dev.of_node)
2056                 host->wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1);
2057
2058         mmc->ops        = &omap_hsmmc_ops;
2059
2060         mmc->f_min = OMAP_MMC_MIN_CLOCK;
2061
2062         if (pdata->max_freq > 0)
2063                 mmc->f_max = pdata->max_freq;
2064         else if (mmc->f_max == 0)
2065                 mmc->f_max = OMAP_MMC_MAX_CLOCK;
2066
2067         spin_lock_init(&host->irq_lock);
2068
2069         host->fclk = devm_clk_get(&pdev->dev, "fck");
2070         if (IS_ERR(host->fclk)) {
2071                 ret = PTR_ERR(host->fclk);
2072                 host->fclk = NULL;
2073                 goto err1;
2074         }
2075
2076         if (host->pdata->controller_flags & OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
2077                 dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
2078                 omap_hsmmc_ops.multi_io_quirk = omap_hsmmc_multi_io_quirk;
2079         }
2080
2081         device_init_wakeup(&pdev->dev, true);
2082         pm_runtime_enable(host->dev);
2083         pm_runtime_get_sync(host->dev);
2084         pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
2085         pm_runtime_use_autosuspend(host->dev);
2086
2087         omap_hsmmc_context_save(host);
2088
2089         host->dbclk = devm_clk_get(&pdev->dev, "mmchsdb_fck");
2090         /*
2091          * MMC can still work without debounce clock.
2092          */
2093         if (IS_ERR(host->dbclk)) {
2094                 host->dbclk = NULL;
2095         } else if (clk_prepare_enable(host->dbclk) != 0) {
2096                 dev_warn(mmc_dev(host->mmc), "Failed to enable debounce clk\n");
2097                 host->dbclk = NULL;
2098         }
2099
2100         /* Since we do only SG emulation, we can have as many segs
2101          * as we want. */
2102         mmc->max_segs = 1024;
2103
2104         mmc->max_blk_size = 512;       /* Block Length at max can be 1024 */
2105         mmc->max_blk_count = 0xFFFF;    /* No. of Blocks is 16 bits */
2106         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2107         mmc->max_seg_size = mmc->max_req_size;
2108
2109         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
2110                      MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
2111
2112         mmc->caps |= mmc_pdata(host)->caps;
2113         if (mmc->caps & MMC_CAP_8_BIT_DATA)
2114                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2115
2116         if (mmc_pdata(host)->nonremovable)
2117                 mmc->caps |= MMC_CAP_NONREMOVABLE;
2118
2119         mmc->pm_caps |= mmc_pdata(host)->pm_caps;
2120
2121         omap_hsmmc_conf_bus_power(host);
2122
2123         host->rx_chan = dma_request_chan(&pdev->dev, "rx");
2124         if (IS_ERR(host->rx_chan)) {
2125                 dev_err(mmc_dev(host->mmc), "RX DMA channel request failed\n");
2126                 ret = PTR_ERR(host->rx_chan);
2127                 goto err_irq;
2128         }
2129
2130         host->tx_chan = dma_request_chan(&pdev->dev, "tx");
2131         if (IS_ERR(host->tx_chan)) {
2132                 dev_err(mmc_dev(host->mmc), "TX DMA channel request failed\n");
2133                 ret = PTR_ERR(host->tx_chan);
2134                 goto err_irq;
2135         }
2136
2137         /* Request IRQ for MMC operations */
2138         ret = devm_request_irq(&pdev->dev, host->irq, omap_hsmmc_irq, 0,
2139                         mmc_hostname(mmc), host);
2140         if (ret) {
2141                 dev_err(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n");
2142                 goto err_irq;
2143         }
2144
2145         ret = omap_hsmmc_reg_get(host);
2146         if (ret)
2147                 goto err_irq;
2148
2149         mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
2150
2151         omap_hsmmc_disable_irq(host);
2152
2153         /*
2154          * For now, only support SDIO interrupt if we have a separate
2155          * wake-up interrupt configured from device tree. This is because
2156          * the wake-up interrupt is needed for idle state and some
2157          * platforms need special quirks. And we don't want to add new
2158          * legacy mux platform init code callbacks any longer as we
2159          * are moving to DT based booting anyways.
2160          */
2161         ret = omap_hsmmc_configure_wake_irq(host);
2162         if (!ret)
2163                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2164
2165         omap_hsmmc_protect_card(host);
2166
2167         mmc_add_host(mmc);
2168
2169         if (mmc_pdata(host)->name != NULL) {
2170                 ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name);
2171                 if (ret < 0)
2172                         goto err_slot_name;
2173         }
2174         if (host->get_cover_state) {
2175                 ret = device_create_file(&mmc->class_dev,
2176                                          &dev_attr_cover_switch);
2177                 if (ret < 0)
2178                         goto err_slot_name;
2179         }
2180
2181         omap_hsmmc_debugfs(mmc);
2182         pm_runtime_mark_last_busy(host->dev);
2183         pm_runtime_put_autosuspend(host->dev);
2184
2185         return 0;
2186
2187 err_slot_name:
2188         mmc_remove_host(mmc);
2189 err_irq:
2190         device_init_wakeup(&pdev->dev, false);
2191         if (!IS_ERR_OR_NULL(host->tx_chan))
2192                 dma_release_channel(host->tx_chan);
2193         if (!IS_ERR_OR_NULL(host->rx_chan))
2194                 dma_release_channel(host->rx_chan);
2195         pm_runtime_dont_use_autosuspend(host->dev);
2196         pm_runtime_put_sync(host->dev);
2197         pm_runtime_disable(host->dev);
2198         if (host->dbclk)
2199                 clk_disable_unprepare(host->dbclk);
2200 err1:
2201 err_gpio:
2202         mmc_free_host(mmc);
2203 err:
2204         return ret;
2205 }
2206
2207 static int omap_hsmmc_remove(struct platform_device *pdev)
2208 {
2209         struct omap_hsmmc_host *host = platform_get_drvdata(pdev);
2210
2211         pm_runtime_get_sync(host->dev);
2212         mmc_remove_host(host->mmc);
2213
2214         dma_release_channel(host->tx_chan);
2215         dma_release_channel(host->rx_chan);
2216
2217         pm_runtime_dont_use_autosuspend(host->dev);
2218         pm_runtime_put_sync(host->dev);
2219         pm_runtime_disable(host->dev);
2220         device_init_wakeup(&pdev->dev, false);
2221         if (host->dbclk)
2222                 clk_disable_unprepare(host->dbclk);
2223
2224         mmc_free_host(host->mmc);
2225
2226         return 0;
2227 }
2228
2229 #ifdef CONFIG_PM_SLEEP
2230 static int omap_hsmmc_suspend(struct device *dev)
2231 {
2232         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2233
2234         if (!host)
2235                 return 0;
2236
2237         pm_runtime_get_sync(host->dev);
2238
2239         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER)) {
2240                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2241                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2242                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2243                 OMAP_HSMMC_WRITE(host->base, HCTL,
2244                                 OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
2245         }
2246
2247         if (host->dbclk)
2248                 clk_disable_unprepare(host->dbclk);
2249
2250         pm_runtime_put_sync(host->dev);
2251         return 0;
2252 }
2253
2254 /* Routine to resume the MMC device */
2255 static int omap_hsmmc_resume(struct device *dev)
2256 {
2257         struct omap_hsmmc_host *host = dev_get_drvdata(dev);
2258
2259         if (!host)
2260                 return 0;
2261
2262         pm_runtime_get_sync(host->dev);
2263
2264         if (host->dbclk)
2265                 clk_prepare_enable(host->dbclk);
2266
2267         if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
2268                 omap_hsmmc_conf_bus_power(host);
2269
2270         omap_hsmmc_protect_card(host);
2271         pm_runtime_mark_last_busy(host->dev);
2272         pm_runtime_put_autosuspend(host->dev);
2273         return 0;
2274 }
2275 #endif
2276
2277 static int omap_hsmmc_runtime_suspend(struct device *dev)
2278 {
2279         struct omap_hsmmc_host *host;
2280         unsigned long flags;
2281         int ret = 0;
2282
2283         host = platform_get_drvdata(to_platform_device(dev));
2284         omap_hsmmc_context_save(host);
2285         dev_dbg(dev, "disabled\n");
2286
2287         spin_lock_irqsave(&host->irq_lock, flags);
2288         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2289             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2290                 /* disable sdio irq handling to prevent race */
2291                 OMAP_HSMMC_WRITE(host->base, ISE, 0);
2292                 OMAP_HSMMC_WRITE(host->base, IE, 0);
2293
2294                 if (!(OMAP_HSMMC_READ(host->base, PSTATE) & DLEV_DAT(1))) {
2295                         /*
2296                          * dat1 line low, pending sdio irq
2297                          * race condition: possible irq handler running on
2298                          * multi-core, abort
2299                          */
2300                         dev_dbg(dev, "pending sdio irq, abort suspend\n");
2301                         OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2302                         OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2303                         OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2304                         pm_runtime_mark_last_busy(dev);
2305                         ret = -EBUSY;
2306                         goto abort;
2307                 }
2308
2309                 pinctrl_pm_select_idle_state(dev);
2310         } else {
2311                 pinctrl_pm_select_idle_state(dev);
2312         }
2313
2314 abort:
2315         spin_unlock_irqrestore(&host->irq_lock, flags);
2316         return ret;
2317 }
2318
2319 static int omap_hsmmc_runtime_resume(struct device *dev)
2320 {
2321         struct omap_hsmmc_host *host;
2322         unsigned long flags;
2323
2324         host = platform_get_drvdata(to_platform_device(dev));
2325         omap_hsmmc_context_restore(host);
2326         dev_dbg(dev, "enabled\n");
2327
2328         spin_lock_irqsave(&host->irq_lock, flags);
2329         if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
2330             (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
2331
2332                 pinctrl_pm_select_default_state(host->dev);
2333
2334                 /* irq lost, if pinmux incorrect */
2335                 OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
2336                 OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
2337                 OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
2338         } else {
2339                 pinctrl_pm_select_default_state(host->dev);
2340         }
2341         spin_unlock_irqrestore(&host->irq_lock, flags);
2342         return 0;
2343 }
2344
2345 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
2346         SET_SYSTEM_SLEEP_PM_OPS(omap_hsmmc_suspend, omap_hsmmc_resume)
2347         .runtime_suspend = omap_hsmmc_runtime_suspend,
2348         .runtime_resume = omap_hsmmc_runtime_resume,
2349 };
2350
2351 static struct platform_driver omap_hsmmc_driver = {
2352         .probe          = omap_hsmmc_probe,
2353         .remove         = omap_hsmmc_remove,
2354         .driver         = {
2355                 .name = DRIVER_NAME,
2356                 .pm = &omap_hsmmc_dev_pm_ops,
2357                 .of_match_table = of_match_ptr(omap_mmc_of_match),
2358         },
2359 };
2360
2361 module_platform_driver(omap_hsmmc_driver);
2362 MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver");
2363 MODULE_LICENSE("GPL");
2364 MODULE_ALIAS("platform:" DRIVER_NAME);
2365 MODULE_AUTHOR("Texas Instruments Inc");