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                                 goto err;
 123                         }
 124                         hsmmc[i].vcc = reg;
 125                         mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);
 126
 127                         /* allow an aux regulator */
 128                         reg = regulator_get(dev, "vmmc_aux");
 129                         hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;
 130
 131                         /* UGLY HACK:  workaround regulator framework bugs.
 132                          * When the bootloader leaves a supply active, it's
 133                          * initialized with zero usecount ... and we can't
 134                          * disable it without first enabling it.  Until the
 135                          * framework is fixed, we need a workaround like this
 136                          * (which is safe for MMC, but not in general).
 137                          */
 138                         if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
 139                                 regulator_enable(hsmmc[i].vcc);
 140                                 regulator_disable(hsmmc[i].vcc);
 141                         }
 142                         if (hsmmc[i].vcc_aux) {
 143                                 if (regulator_is_enabled(reg) > 0) {
 144                                         regulator_enable(reg);
 145                                         regulator_disable(reg);
 146                                 }
 147                         }
 148
 149                         break;
 150                 }
 151         }
 152
 153         return 0;
 154
 155 err:
 156         gpio_free(mmc->slots[0].switch_pin);
 157 done:
 158         mmc->slots[0].card_detect_irq = 0;
 159         mmc->slots[0].card_detect = NULL;
 160
 161         dev_err(dev, "err %d configuring card detect\n", ret);
 162         return ret;
 163 }
 164
 165 static void twl_mmc_cleanup(struct device *dev)
 166 {
 167         struct omap_mmc_platform_data *mmc = dev->platform_data;
 168
 169         gpio_free(mmc->slots[0].switch_pin);
 170 }
 171
 172 #ifdef CONFIG_PM
 173
 174 static int twl_mmc_suspend(struct device *dev, int slot)
 175 {
 176         struct omap_mmc_platform_data *mmc = dev->platform_data;
 177
 178         disable_irq(mmc->slots[0].card_detect_irq);
 179         return 0;
 180 }
 181
 182 static int twl_mmc_resume(struct device *dev, int slot)
 183 {
 184         struct omap_mmc_platform_data *mmc = dev->platform_data;
 185
 186         enable_irq(mmc->slots[0].card_detect_irq);
 187         return 0;
 188 }
 189
 190 #else
 191 #define twl_mmc_suspend NULL
 192 #define twl_mmc_resume  NULL
 193 #endif
 194
 195 static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
 196                                 int vdd)
 197 {
 198         u32 reg;
 199         int ret = 0;
 200         struct twl_mmc_controller *c = &hsmmc[0];
 201         struct omap_mmc_platform_data *mmc = dev->platform_data;
 202
 203         /*
 204          * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
 205          * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
 206          * 1.8V and 3.0V modes, controlled by the PBIAS register.
 207          *
 208          * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
 209          * is most naturally TWL VSIM; those pins also use PBIAS.
 210          *
 211          * FIXME handle VMMC1A as needed ...
 212          */
 213         if (power_on) {
 214                 if (cpu_is_omap2430()) {
 215                         reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
 216                         if ((1 << vdd) >= MMC_VDD_30_31)
 217                                 reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
 218                         else
 219                                 reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
 220                         omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
 221                 }
 222
 223                 if (mmc->slots[0].internal_clock) {
 224                         reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
 225                         reg |= OMAP2_MMCSDIO1ADPCLKISEL;
 226                         omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
 227                 }
 228
 229                 reg = omap_ctrl_readl(control_pbias_offset);
 230                 reg |= OMAP2_PBIASSPEEDCTRL0;
 231                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
 232                 omap_ctrl_writel(reg, control_pbias_offset);
 233
 234                 ret = mmc_regulator_set_ocr(c->vcc, vdd);
 235
 236                 /* 100ms delay required for PBIAS configuration */
 237                 msleep(100);
 238                 reg = omap_ctrl_readl(control_pbias_offset);
 239                 reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
 240                 if ((1 << vdd) <= MMC_VDD_165_195)
 241                         reg &= ~OMAP2_PBIASLITEVMODE0;
 242                 else
 243                         reg |= OMAP2_PBIASLITEVMODE0;
 244                 omap_ctrl_writel(reg, control_pbias_offset);
 245         } else {
 246                 reg = omap_ctrl_readl(control_pbias_offset);
 247                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
 248                 omap_ctrl_writel(reg, control_pbias_offset);
 249
 250                 ret = mmc_regulator_set_ocr(c->vcc, 0);
 251
 252                 /* 100ms delay required for PBIAS configuration */
 253                 msleep(100);
 254                 reg = omap_ctrl_readl(control_pbias_offset);
 255                 reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
 256                         OMAP2_PBIASLITEVMODE0);
 257                 omap_ctrl_writel(reg, control_pbias_offset);
 258         }
 259
 260         return ret;
 261 }
 262
 263 static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
 264 {
 265         int ret = 0;
 266         struct twl_mmc_controller *c = &hsmmc[1];
 267         struct omap_mmc_platform_data *mmc = dev->platform_data;
 268
 269         /* If we don't see a Vcc regulator, assume it's a fixed
 270          * voltage always-on regulator.
 271          */
 272         if (!c->vcc)
 273                 return 0;
 274
 275         /*
 276          * Assume Vcc regulator is used only to power the card ... OMAP
 277          * VDDS is used to power the pins, optionally with a transceiver to
 278          * support cards using voltages other than VDDS (1.8V nominal).  When a
 279          * transceiver is used, DAT3..7 are muxed as transceiver control pins.
 280          *
 281          * In some cases this regulator won't support enable/disable;
 282          * e.g. it's a fixed rail for a WLAN chip.
 283          *
 284          * In other cases vcc_aux switches interface power.  Example, for
 285          * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
 286          * chips/cards need an interface voltage rail too.
 287          */
 288         if (power_on) {
 289                 /* only MMC2 supports a CLKIN */
 290                 if (mmc->slots[0].internal_clock) {
 291                         u32 reg;
 292
 293                         reg = omap_ctrl_readl(control_devconf1_offset);
 294                         reg |= OMAP2_MMCSDIO2ADPCLKISEL;
 295                         omap_ctrl_writel(reg, control_devconf1_offset);
 296                 }
 297                 ret = mmc_regulator_set_ocr(c->vcc, vdd);
 298                 /* enable interface voltage rail, if needed */
 299                 if (ret == 0 && c->vcc_aux) {
 300                         ret = regulator_enable(c->vcc_aux);
 301                         if (ret < 0)
 302                                 ret = mmc_regulator_set_ocr(c->vcc, 0);
 303                 }
 304         } else {
 305                 if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
 306                         ret = regulator_disable(c->vcc_aux);
 307                 if (ret == 0)
 308                         ret = mmc_regulator_set_ocr(c->vcc, 0);
 309         }
 310
 311         return ret;
 312 }
 313
 314 static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
 315
 316 void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
 317 {
 318         struct twl4030_hsmmc_info *c;
 319         int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
 320
 321         if (cpu_is_omap2430()) {
 322                 control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
 323                 control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
 324                 nr_hsmmc = 2;
 325         } else {
 326                 control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
 327                 control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
 328         }
 329
 330         for (c = controllers; c->mmc; c++) {
 331                 struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
 332                 struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
 333
 334                 if (!c->mmc || c->mmc > nr_hsmmc) {
 335                         pr_debug("MMC%d: no such controller\n", c->mmc);
 336                         continue;
 337                 }
 338                 if (mmc) {
 339                         pr_debug("MMC%d: already configured\n", c->mmc);
 340                         continue;
 341                 }
 342
 343                 mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
 344                 if (!mmc) {
 345                         pr_err("Cannot allocate memory for mmc device!\n");
 346                         return;
 347                 }
 348
 349                 if (c->name)
 350                         strncpy(twl->name, c->name, HSMMC_NAME_LEN);
 351                 else
 352                         snprintf(twl->name, ARRAY_SIZE(twl->name),
 353                                 "mmc%islot%i", c->mmc, 1);
 354                 mmc->slots[0].name = twl->name;
 355                 mmc->nr_slots = 1;
 356                 mmc->slots[0].wires = c->wires;
 357                 mmc->slots[0].internal_clock = !c->ext_clock;
 358                 mmc->dma_mask = 0xffffffff;
 359                 mmc->init = twl_mmc_late_init;
 360
 361                 /* note: twl4030 card detect GPIOs can disable VMMCx ... */
 362                 if (gpio_is_valid(c->gpio_cd)) {
 363                         mmc->cleanup = twl_mmc_cleanup;
 364                         mmc->suspend = twl_mmc_suspend;
 365                         mmc->resume = twl_mmc_resume;
 366
 367                         mmc->slots[0].switch_pin = c->gpio_cd;
 368                         mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
 369                         if (c->cover_only)
 370                                 mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
 371                         else
 372                                 mmc->slots[0].card_detect = twl_mmc_card_detect;
 373                 } else
 374                         mmc->slots[0].switch_pin = -EINVAL;
 375
 376                 /* write protect normally uses an OMAP gpio */
 377                 if (gpio_is_valid(c->gpio_wp)) {
 378                         gpio_request(c->gpio_wp, "mmc_wp");
 379                         gpio_direction_input(c->gpio_wp);
 380
 381                         mmc->slots[0].gpio_wp = c->gpio_wp;
 382                         mmc->slots[0].get_ro = twl_mmc_get_ro;
 383                 } else
 384                         mmc->slots[0].gpio_wp = -EINVAL;
 385
 386                 /* NOTE:  MMC slots should have a Vcc regulator set up.
 387                  * This may be from a TWL4030-family chip, another
 388                  * controllable regulator, or a fixed supply.
 389                  *
 390                  * temporary HACK: ocr_mask instead of fixed supply
 391                  */
 392                 mmc->slots[0].ocr_mask = c->ocr_mask;
 393
 394                 switch (c->mmc) {
 395                 case 1:
 396                         /* on-chip level shifting via PBIAS0/PBIAS1 */
 397                         mmc->slots[0].set_power = twl_mmc1_set_power;
 398                         break;
 399                 case 2:
 400                         if (c->ext_clock)
 401                                 c->transceiver = 1;
 402                         if (c->transceiver && c->wires > 4)
 403                                 c->wires = 4;
 404                         /* FALLTHROUGH */
 405                 case 3:
 406                         /* off-chip level shifting, or none */
 407                         mmc->slots[0].set_power = twl_mmc23_set_power;
 408                         break;
 409                 default:
 410                         pr_err("MMC%d configuration not supported!\n", c->mmc);
 411                         kfree(mmc);
 412                         continue;
 413                 }
 414                 hsmmc_data[c->mmc - 1] = mmc;
 415         }
 416
 417         omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
 418
 419         /* pass the device nodes back to board setup code */
 420         for (c = controllers; c->mmc; c++) {
 421                 struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
 422
 423                 if (!c->mmc || c->mmc > nr_hsmmc)
 424                         continue;
 425                 c->dev = mmc->dev;
 426         }
 427 }
 428
 429 #endif