arch/arm/mach-omap2/mmc-twl4030.c

   1 /*
   2  * linux/arch/arm/mach-omap2/mmc-twl4030.c
   3  *
   4  * Copyright (C) 2007-2008 Texas Instruments
   5  * Copyright (C) 2008 Nokia Corporation
   6  * Author: Texas Instruments
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/gpio.h>
  19 #include <linux/mmc/host.h>
  20 #include <linux/regulator/consumer.h>
  21
  22 #include <mach/hardware.h>
  23 #include <mach/control.h>
  24 #include <mach/mmc.h>
  25 #include <mach/board.h>
  26
  27 #include "mmc-twl4030.h"
  28
  29
  30 #if defined(CONFIG_REGULATOR) && \
  31         (defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
  32
  33 static u16 control_pbias_offset;
  34 static u16 control_devconf1_offset;
  35
  36 #define HSMMC_NAME_LEN  9
  37
  38 static struct twl_mmc_controller {
  39         struct omap_mmc_platform_data   *mmc;
  40         /* Vcc == configured supply
  41          * Vcc_alt == optional
  42          *   -  MMC1, supply for DAT4..DAT7
  43          *   -  MMC2/MMC2, external level shifter voltage supply, for
  44          *      chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
  45          */
  46         struct regulator                *vcc;
  47         struct regulator                *vcc_aux;
  48         char                            name[HSMMC_NAME_LEN + 1];
  49 } hsmmc[OMAP34XX_NR_MMC];
  50
  51 static int twl_mmc_card_detect(int irq)
  52 {
  53         unsigned i;
  54
  55         for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
  56                 struct omap_mmc_platform_data *mmc;
  57
  58                 mmc = hsmmc[i].mmc;
  59                 if (!mmc)
  60                         continue;
  61                 if (irq != mmc->slots[0].card_detect_irq)
  62                         continue;
  63
  64                 /* NOTE: assumes card detect signal is active-low */
  65                 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
  66         }
  67         return -ENOSYS;
  68 }
  69
  70 static int twl_mmc_get_ro(struct device *dev, int slot)
  71 {
  72         struct omap_mmc_platform_data *mmc = dev->platform_data;
  73
  74         /* NOTE: assumes write protect signal is active-high */
  75         return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
  76 }
  77
  78 static int twl_mmc_get_cover_state(struct device *dev, int slot)
  79 {
  80         struct omap_mmc_platform_data *mmc = dev->platform_data;
  81
  82         /* NOTE: assumes card detect signal is active-low */
  83         return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
  84 }
  85
  86 /*
  87  * MMC Slot Initialization.
  88  */
  89 static int twl_mmc_late_init(struct device *dev)
  90 {
  91         struct omap_mmc_platform_data *mmc = dev->platform_data;
  92         int ret = 0;
  93         int i;
  94
  95         /* MMC/SD/SDIO doesn't require a card detect switch */
  96         if (gpio_is_valid(mmc->slots[0].switch_pin)) {
  97                 ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
  98                 if (ret)
  99                         goto done;
 100                 ret = gpio_direction_input(mmc->slots[0].switch_pin);
 101                 if (ret)
 102                         goto err;
 103         }
 104
 105         /* require at least main regulator */
 106         for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
 107                 if (hsmmc[i].name == mmc->slots[0].name) {
 108                         struct regulator *reg;
 109
 110                         hsmmc[i].mmc = mmc;
 111
 112                         reg = regulator_get(dev, "vmmc");
 113                         if (IS_ERR(reg)) {
 114                                 dev_dbg(dev, "vmmc regulator missing\n");
 115                                 /* HACK: until fixed.c regulator is usable,
 116                                  * we don't require a main regulator
 117                                  * for MMC2 or MMC3
 118                                  */
 119                                 if (i != 0)
 120                                         break;
 121                                 ret = PTR_ERR(reg);
 122                                 hsmmc[i].vcc = NULL;
 123                                 goto err;
 124                         }
 125                         hsmmc[i].vcc = reg;
 126                         mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);
 127
 128                         /* allow an aux regulator */
 129                         reg = regulator_get(dev, "vmmc_aux");
 130                         hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;
 131
 132                         /* UGLY HACK:  workaround regulator framework bugs.
 133                          * When the bootloader leaves a supply active, it's
 134                          * initialized with zero usecount ... and we can't
 135                          * disable it without first enabling it.  Until the
 136                          * framework is fixed, we need a workaround like this
 137                          * (which is safe for MMC, but not in general).
 138                          */
 139                         if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
 140                                 regulator_enable(hsmmc[i].vcc);
 141                                 regulator_disable(hsmmc[i].vcc);
 142                         }
 143                         if (hsmmc[i].vcc_aux) {
 144                                 if (regulator_is_enabled(reg) > 0) {
 145                                         regulator_enable(reg);
 146                                         regulator_disable(reg);
 147                                 }
 148                         }
 149
 150                         break;
 151                 }
 152         }
 153
 154         return 0;
 155
 156 err:
 157         gpio_free(mmc->slots[0].switch_pin);
 158 done:
 159         mmc->slots[0].card_detect_irq = 0;
 160         mmc->slots[0].card_detect = NULL;
 161
 162         dev_err(dev, "err %d configuring card detect\n", ret);
 163         return ret;
 164 }
 165
 166 static void twl_mmc_cleanup(struct device *dev)
 167 {
 168         struct omap_mmc_platform_data *mmc = dev->platform_data;
 169         int i;
 170
 171         gpio_free(mmc->slots[0].switch_pin);
 172         for(i = 0; i < ARRAY_SIZE(hsmmc); i++) {
 173                 regulator_put(hsmmc[i].vcc);
 174                 regulator_put(hsmmc[i].vcc_aux);
 175         }
 176 }
 177
 178 #ifdef CONFIG_PM
 179
 180 static int twl_mmc_suspend(struct device *dev, int slot)
 181 {
 182         struct omap_mmc_platform_data *mmc = dev->platform_data;
 183
 184         disable_irq(mmc->slots[0].card_detect_irq);
 185         return 0;
 186 }
 187
 188 static int twl_mmc_resume(struct device *dev, int slot)
 189 {
 190         struct omap_mmc_platform_data *mmc = dev->platform_data;
 191
 192         enable_irq(mmc->slots[0].card_detect_irq);
 193         return 0;
 194 }
 195
 196 #else
 197 #define twl_mmc_suspend NULL
 198 #define twl_mmc_resume  NULL
 199 #endif
 200
 201 static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
 202                                 int vdd)
 203 {
 204         u32 reg;
 205         int ret = 0;
 206         struct twl_mmc_controller *c = &hsmmc[0];
 207         struct omap_mmc_platform_data *mmc = dev->platform_data;
 208
 209         /*
 210          * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
 211          * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
 212          * 1.8V and 3.0V modes, controlled by the PBIAS register.
 213          *
 214          * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
 215          * is most naturally TWL VSIM; those pins also use PBIAS.
 216          *
 217          * FIXME handle VMMC1A as needed ...
 218          */
 219         if (power_on) {
 220                 if (cpu_is_omap2430()) {
 221                         reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
 222                         if ((1 << vdd) >= MMC_VDD_30_31)
 223                                 reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
 224                         else
 225                                 reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
 226                         omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
 227                 }
 228
 229                 if (mmc->slots[0].internal_clock) {
 230                         reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
 231                         reg |= OMAP2_MMCSDIO1ADPCLKISEL;
 232                         omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
 233                 }
 234
 235                 reg = omap_ctrl_readl(control_pbias_offset);
 236                 reg |= OMAP2_PBIASSPEEDCTRL0;
 237                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
 238                 omap_ctrl_writel(reg, control_pbias_offset);
 239
 240                 ret = mmc_regulator_set_ocr(c->vcc, vdd);
 241
 242                 /* 100ms delay required for PBIAS configuration */
 243                 msleep(100);
 244                 reg = omap_ctrl_readl(control_pbias_offset);
 245                 reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
 246                 if ((1 << vdd) <= MMC_VDD_165_195)
 247                         reg &= ~OMAP2_PBIASLITEVMODE0;
 248                 else
 249                         reg |= OMAP2_PBIASLITEVMODE0;
 250                 omap_ctrl_writel(reg, control_pbias_offset);
 251         } else {
 252                 reg = omap_ctrl_readl(control_pbias_offset);
 253                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
 254                 omap_ctrl_writel(reg, control_pbias_offset);
 255
 256                 ret = mmc_regulator_set_ocr(c->vcc, 0);
 257
 258                 /* 100ms delay required for PBIAS configuration */
 259                 msleep(100);
 260                 reg = omap_ctrl_readl(control_pbias_offset);
 261                 reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
 262                         OMAP2_PBIASLITEVMODE0);
 263                 omap_ctrl_writel(reg, control_pbias_offset);
 264         }
 265
 266         return ret;
 267 }
 268
 269 static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
 270 {
 271         int ret = 0;
 272         struct twl_mmc_controller *c = NULL;
 273         struct omap_mmc_platform_data *mmc = dev->platform_data;
 274         int i;
 275
 276         for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
 277                 if (mmc == hsmmc[i].mmc) {
 278                         c = &hsmmc[i];
 279                         break;
 280                 }
 281         }
 282
 283         if (c == NULL)
 284                 return -ENODEV;
 285
 286         /* If we don't see a Vcc regulator, assume it's a fixed
 287          * voltage always-on regulator.
 288          */
 289         if (!c->vcc)
 290                 return 0;
 291
 292         /*
 293          * Assume Vcc regulator is used only to power the card ... OMAP
 294          * VDDS is used to power the pins, optionally with a transceiver to
 295          * support cards using voltages other than VDDS (1.8V nominal).  When a
 296          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 297          *
 298          * In some cases this regulator won't support enable/disable;
 299          * e.g. it's a fixed rail for a WLAN chip.
 300          *
 301          * In other cases vcc_aux switches interface power.  Example, for
 302          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 303          * chips/cards need an interface voltage rail too.
 304          */
 305         if (power_on) {
 306                 /* only MMC2 supports a CLKIN */
 307                 if (mmc->slots[0].internal_clock) {
 308                         u32 reg;
 309
 310                         reg = omap_ctrl_readl(control_devconf1_offset);
 311                         reg |= OMAP2_MMCSDIO2ADPCLKISEL;
 312                         omap_ctrl_writel(reg, control_devconf1_offset);
 313                 }
 314                 ret = mmc_regulator_set_ocr(c->vcc, vdd);
 315                 /* enable interface voltage rail, if needed */
 316                 if (ret == 0 && c->vcc_aux) {
 317                         ret = regulator_enable(c->vcc_aux);
 318                         if (ret < 0)
 319                                 ret = mmc_regulator_set_ocr(c->vcc, 0);
 320                 }
 321         } else {
 322                 if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
 323                         ret = regulator_disable(c->vcc_aux);
 324                 if (ret == 0)
 325                         ret = mmc_regulator_set_ocr(c->vcc, 0);
 326         }
 327
 328         return ret;
 329 }
 330
 331 static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
 332
 333 void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
 334 {
 335         struct twl4030_hsmmc_info *c;
 336         int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
 337
 338         if (cpu_is_omap2430()) {
 339                 control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
 340                 control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
 341                 nr_hsmmc = 2;
 342         } else {
 343                 control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
 344                 control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
 345         }
 346
 347         for (c = controllers; c->mmc; c++) {
 348                 struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
 349                 struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
 350
 351                 if (!c->mmc || c->mmc > nr_hsmmc) {
 352                         pr_debug("MMC%d: no such controller\n", c->mmc);
 353                         continue;
 354                 }
 355                 if (mmc) {
 356                         pr_debug("MMC%d: already configured\n", c->mmc);
 357                         continue;
 358                 }
 359
 360                 mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
 361                 if (!mmc) {
 362                         pr_err("Cannot allocate memory for mmc device!\n");
 363                         return;
 364                 }
 365
 366                 if (c->name)
 367                         strncpy(twl->name, c->name, HSMMC_NAME_LEN);
 368                 else
 369                         snprintf(twl->name, ARRAY_SIZE(twl->name),
 370                                 "mmc%islot%i", c->mmc, 1);
 371                 mmc->slots[0].name = twl->name;
 372                 mmc->nr_slots = 1;
 373                 mmc->slots[0].wires = c->wires;
 374                 mmc->slots[0].internal_clock = !c->ext_clock;
 375                 mmc->dma_mask = 0xffffffff;
 376                 mmc->init = twl_mmc_late_init;
 377
 378                 /* note: twl4030 card detect GPIOs can disable VMMCx ... */
 379                 if (gpio_is_valid(c->gpio_cd)) {
 380                         mmc->cleanup = twl_mmc_cleanup;
 381                         mmc->suspend = twl_mmc_suspend;
 382                         mmc->resume = twl_mmc_resume;
 383
 384                         mmc->slots[0].switch_pin = c->gpio_cd;
 385                         mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
 386                         if (c->cover_only)
 387                                 mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
 388                         else
 389                                 mmc->slots[0].card_detect = twl_mmc_card_detect;
 390                 } else
 391                         mmc->slots[0].switch_pin = -EINVAL;
 392
 393                 /* write protect normally uses an OMAP gpio */
 394                 if (gpio_is_valid(c->gpio_wp)) {
 395                         gpio_request(c->gpio_wp, "mmc_wp");
 396                         gpio_direction_input(c->gpio_wp);
 397
 398                         mmc->slots[0].gpio_wp = c->gpio_wp;
 399                         mmc->slots[0].get_ro = twl_mmc_get_ro;
 400                 } else
 401                         mmc->slots[0].gpio_wp = -EINVAL;
 402
 403                 /* NOTE:  MMC slots should have a Vcc regulator set up.
 404                  * This may be from a TWL4030-family chip, another
 405                  * controllable regulator, or a fixed supply.
 406                  *
 407                  * temporary HACK: ocr_mask instead of fixed supply
 408                  */
 409                 mmc->slots[0].ocr_mask = c->ocr_mask;
 410
 411                 switch (c->mmc) {
 412                 case 1:
 413                         /* on-chip level shifting via PBIAS0/PBIAS1 */
 414                         mmc->slots[0].set_power = twl_mmc1_set_power;
 415                         break;
 416                 case 2:
 417                         if (c->ext_clock)
 418                                 c->transceiver = 1;
 419                         if (c->transceiver && c->wires > 4)
 420                                 c->wires = 4;
 421                         /* FALLTHROUGH */
 422                 case 3:
 423                         /* off-chip level shifting, or none */
 424                         mmc->slots[0].set_power = twl_mmc23_set_power;
 425                         break;
 426                 default:
 427                         pr_err("MMC%d configuration not supported!\n", c->mmc);
 428                         kfree(mmc);
 429                         continue;
 430                 }
 431                 hsmmc_data[c->mmc - 1] = mmc;
 432         }
 433
 434         omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
 435
 436         /* pass the device nodes back to board setup code */
 437         for (c = controllers; c->mmc; c++) {
 438                 struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
 439
 440                 if (!c->mmc || c->mmc > nr_hsmmc)
 441                         continue;
 442                 c->dev = mmc->dev;
 443         }
 444 }
 445
 446 #endif