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