arch/arm/mach-omap2/hsmmc.c

   1 /*
   2  * linux/arch/arm/mach-omap2/hsmmc.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/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15 #include <linux/delay.h>
  16 #include <linux/gpio.h>
  17 #include <mach/hardware.h>
  18 #include <plat/mmc.h>
  19 #include <plat/omap-pm.h>
  20 #include <plat/mux.h>
  21 #include <plat/omap_device.h>
  22
  23 #include "mux.h"
  24 #include "hsmmc.h"
  25 #include "control.h"
  26
  27 #if defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE)
  28
  29 static u16 control_pbias_offset;
  30 static u16 control_devconf1_offset;
  31 static u16 control_mmc1;
  32
  33 #define HSMMC_NAME_LEN  9
  34
  35 #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
  36
  37 static int hsmmc_get_context_loss(struct device *dev)
  38 {
  39         return omap_pm_get_dev_context_loss_count(dev);
  40 }
  41
  42 #else
  43 #define hsmmc_get_context_loss NULL
  44 #endif
  45
  46 static void omap_hsmmc1_before_set_reg(struct device *dev, int slot,
  47                                   int power_on, int vdd)
  48 {
  49         u32 reg, prog_io;
  50         struct omap_mmc_platform_data *mmc = dev->platform_data;
  51
  52         if (mmc->slots[0].remux)
  53                 mmc->slots[0].remux(dev, slot, power_on);
  54
  55         /*
  56          * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
  57          * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
  58          * 1.8V and 3.0V modes, controlled by the PBIAS register.
  59          *
  60          * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
  61          * is most naturally TWL VSIM; those pins also use PBIAS.
  62          *
  63          * FIXME handle VMMC1A as needed ...
  64          */
  65         if (power_on) {
  66                 if (cpu_is_omap2430()) {
  67                         reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
  68                         if ((1 << vdd) >= MMC_VDD_30_31)
  69                                 reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
  70                         else
  71                                 reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
  72                         omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
  73                 }
  74
  75                 if (mmc->slots[0].internal_clock) {
  76                         reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
  77                         reg |= OMAP2_MMCSDIO1ADPCLKISEL;
  78                         omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
  79                 }
  80
  81                 reg = omap_ctrl_readl(control_pbias_offset);
  82                 if (cpu_is_omap3630()) {
  83                         /* Set MMC I/O to 52Mhz */
  84                         prog_io = omap_ctrl_readl(OMAP343X_CONTROL_PROG_IO1);
  85                         prog_io |= OMAP3630_PRG_SDMMC1_SPEEDCTRL;
  86                         omap_ctrl_writel(prog_io, OMAP343X_CONTROL_PROG_IO1);
  87                 } else {
  88                         reg |= OMAP2_PBIASSPEEDCTRL0;
  89                 }
  90                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
  91                 omap_ctrl_writel(reg, control_pbias_offset);
  92         } else {
  93                 reg = omap_ctrl_readl(control_pbias_offset);
  94                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
  95                 omap_ctrl_writel(reg, control_pbias_offset);
  96         }
  97 }
  98
  99 static void omap_hsmmc1_after_set_reg(struct device *dev, int slot,
 100                                  int power_on, int vdd)
 101 {
 102         u32 reg;
 103
 104         /* 100ms delay required for PBIAS configuration */
 105         msleep(100);
 106
 107         if (power_on) {
 108                 reg = omap_ctrl_readl(control_pbias_offset);
 109                 reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
 110                 if ((1 << vdd) <= MMC_VDD_165_195)
 111                         reg &= ~OMAP2_PBIASLITEVMODE0;
 112                 else
 113                         reg |= OMAP2_PBIASLITEVMODE0;
 114                 omap_ctrl_writel(reg, control_pbias_offset);
 115         } else {
 116                 reg = omap_ctrl_readl(control_pbias_offset);
 117                 reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
 118                         OMAP2_PBIASLITEVMODE0);
 119                 omap_ctrl_writel(reg, control_pbias_offset);
 120         }
 121 }
 122
 123 static void omap4_hsmmc1_before_set_reg(struct device *dev, int slot,
 124                                   int power_on, int vdd)
 125 {
 126         u32 reg;
 127
 128         /*
 129          * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
 130          * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
 131          * 1.8V and 3.0V modes, controlled by the PBIAS register.
 132          */
 133         reg = omap4_ctrl_pad_readl(control_pbias_offset);
 134         reg &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
 135                 OMAP4_MMC1_PWRDNZ_MASK |
 136                 OMAP4_MMC1_PBIASLITE_VMODE_MASK);
 137         omap4_ctrl_pad_writel(reg, control_pbias_offset);
 138 }
 139
 140 static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
 141                                  int power_on, int vdd)
 142 {
 143         u32 reg;
 144         unsigned long timeout;
 145
 146         if (power_on) {
 147                 reg = omap4_ctrl_pad_readl(control_pbias_offset);
 148                 reg |= OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK;
 149                 if ((1 << vdd) <= MMC_VDD_165_195)
 150                         reg &= ~OMAP4_MMC1_PBIASLITE_VMODE_MASK;
 151                 else
 152                         reg |= OMAP4_MMC1_PBIASLITE_VMODE_MASK;
 153                 reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
 154                         OMAP4_MMC1_PWRDNZ_MASK);
 155                 omap4_ctrl_pad_writel(reg, control_pbias_offset);
 156
 157                 timeout = jiffies + msecs_to_jiffies(5);
 158                 do {
 159                         reg = omap4_ctrl_pad_readl(control_pbias_offset);
 160                         if (!(reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK))
 161                                 break;
 162                         usleep_range(100, 200);
 163                 } while (!time_after(jiffies, timeout));
 164
 165                 if (reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK) {
 166                         pr_err("Pbias Voltage is not same as LDO\n");
 167                         /* Caution : On VMODE_ERROR Power Down MMC IO */
 168                         reg &= ~(OMAP4_MMC1_PWRDNZ_MASK);
 169                         omap4_ctrl_pad_writel(reg, control_pbias_offset);
 170                 }
 171         }
 172 }
 173
 174 static void hsmmc2_select_input_clk_src(struct omap_mmc_platform_data *mmc)
 175 {
 176         u32 reg;
 177
 178         reg = omap_ctrl_readl(control_devconf1_offset);
 179         if (mmc->slots[0].internal_clock)
 180                 reg |= OMAP2_MMCSDIO2ADPCLKISEL;
 181         else
 182                 reg &= ~OMAP2_MMCSDIO2ADPCLKISEL;
 183         omap_ctrl_writel(reg, control_devconf1_offset);
 184 }
 185
 186 static void hsmmc2_before_set_reg(struct device *dev, int slot,
 187                                    int power_on, int vdd)
 188 {
 189         struct omap_mmc_platform_data *mmc = dev->platform_data;
 190
 191         if (mmc->slots[0].remux)
 192                 mmc->slots[0].remux(dev, slot, power_on);
 193
 194         if (power_on)
 195                 hsmmc2_select_input_clk_src(mmc);
 196 }
 197
 198 static int am35x_hsmmc2_set_power(struct device *dev, int slot,
 199                                   int power_on, int vdd)
 200 {
 201         struct omap_mmc_platform_data *mmc = dev->platform_data;
 202
 203         if (power_on)
 204                 hsmmc2_select_input_clk_src(mmc);
 205
 206         return 0;
 207 }
 208
 209 static int nop_mmc_set_power(struct device *dev, int slot, int power_on,
 210                                                         int vdd)
 211 {
 212         return 0;
 213 }
 214
 215 static inline void omap_hsmmc_mux(struct omap_mmc_platform_data *mmc_controller,
 216                         int controller_nr)
 217 {
 218         if (gpio_is_valid(mmc_controller->slots[0].switch_pin) &&
 219                 (mmc_controller->slots[0].switch_pin < OMAP_MAX_GPIO_LINES))
 220                 omap_mux_init_gpio(mmc_controller->slots[0].switch_pin,
 221                                         OMAP_PIN_INPUT_PULLUP);
 222         if (gpio_is_valid(mmc_controller->slots[0].gpio_wp) &&
 223                 (mmc_controller->slots[0].gpio_wp < OMAP_MAX_GPIO_LINES))
 224                 omap_mux_init_gpio(mmc_controller->slots[0].gpio_wp,
 225                                         OMAP_PIN_INPUT_PULLUP);
 226         if (cpu_is_omap34xx()) {
 227                 if (controller_nr == 0) {
 228                         omap_mux_init_signal("sdmmc1_clk",
 229                                 OMAP_PIN_INPUT_PULLUP);
 230                         omap_mux_init_signal("sdmmc1_cmd",
 231                                 OMAP_PIN_INPUT_PULLUP);
 232                         omap_mux_init_signal("sdmmc1_dat0",
 233                                 OMAP_PIN_INPUT_PULLUP);
 234                         if (mmc_controller->slots[0].caps &
 235                                 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
 236                                 omap_mux_init_signal("sdmmc1_dat1",
 237                                         OMAP_PIN_INPUT_PULLUP);
 238                                 omap_mux_init_signal("sdmmc1_dat2",
 239                                         OMAP_PIN_INPUT_PULLUP);
 240                                 omap_mux_init_signal("sdmmc1_dat3",
 241                                         OMAP_PIN_INPUT_PULLUP);
 242                         }
 243                         if (mmc_controller->slots[0].caps &
 244                                                 MMC_CAP_8_BIT_DATA) {
 245                                 omap_mux_init_signal("sdmmc1_dat4",
 246                                         OMAP_PIN_INPUT_PULLUP);
 247                                 omap_mux_init_signal("sdmmc1_dat5",
 248                                         OMAP_PIN_INPUT_PULLUP);
 249                                 omap_mux_init_signal("sdmmc1_dat6",
 250                                         OMAP_PIN_INPUT_PULLUP);
 251                                 omap_mux_init_signal("sdmmc1_dat7",
 252                                         OMAP_PIN_INPUT_PULLUP);
 253                         }
 254                 }
 255                 if (controller_nr == 1) {
 256                         /* MMC2 */
 257                         omap_mux_init_signal("sdmmc2_clk",
 258                                 OMAP_PIN_INPUT_PULLUP);
 259                         omap_mux_init_signal("sdmmc2_cmd",
 260                                 OMAP_PIN_INPUT_PULLUP);
 261                         omap_mux_init_signal("sdmmc2_dat0",
 262                                 OMAP_PIN_INPUT_PULLUP);
 263
 264                         /*
 265                          * For 8 wire configurations, Lines DAT4, 5, 6 and 7
 266                          * need to be muxed in the board-*.c files
 267                          */
 268                         if (mmc_controller->slots[0].caps &
 269                                 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
 270                                 omap_mux_init_signal("sdmmc2_dat1",
 271                                         OMAP_PIN_INPUT_PULLUP);
 272                                 omap_mux_init_signal("sdmmc2_dat2",
 273                                         OMAP_PIN_INPUT_PULLUP);
 274                                 omap_mux_init_signal("sdmmc2_dat3",
 275                                         OMAP_PIN_INPUT_PULLUP);
 276                         }
 277                         if (mmc_controller->slots[0].caps &
 278                                                         MMC_CAP_8_BIT_DATA) {
 279                                 omap_mux_init_signal("sdmmc2_dat4.sdmmc2_dat4",
 280                                         OMAP_PIN_INPUT_PULLUP);
 281                                 omap_mux_init_signal("sdmmc2_dat5.sdmmc2_dat5",
 282                                         OMAP_PIN_INPUT_PULLUP);
 283                                 omap_mux_init_signal("sdmmc2_dat6.sdmmc2_dat6",
 284                                         OMAP_PIN_INPUT_PULLUP);
 285                                 omap_mux_init_signal("sdmmc2_dat7.sdmmc2_dat7",
 286                                         OMAP_PIN_INPUT_PULLUP);
 287                         }
 288                 }
 289
 290                 /*
 291                  * For MMC3 the pins need to be muxed in the board-*.c files
 292                  */
 293         }
 294 }
 295
 296 static int omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
 297                                  struct omap_mmc_platform_data *mmc)
 298 {
 299         char *hc_name;
 300
 301         hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
 302         if (!hc_name) {
 303                 pr_err("Cannot allocate memory for controller slot name\n");
 304                 kfree(hc_name);
 305                 return -ENOMEM;
 306         }
 307
 308         if (c->name)
 309                 strncpy(hc_name, c->name, HSMMC_NAME_LEN);
 310         else
 311                 snprintf(hc_name, (HSMMC_NAME_LEN + 1), "mmc%islot%i",
 312                                                                 c->mmc, 1);
 313         mmc->slots[0].name = hc_name;
 314         mmc->nr_slots = 1;
 315         mmc->slots[0].caps = c->caps;
 316         mmc->slots[0].pm_caps = c->pm_caps;
 317         mmc->slots[0].internal_clock = !c->ext_clock;
 318         mmc->dma_mask = 0xffffffff;
 319         if (cpu_is_omap44xx())
 320                 mmc->reg_offset = OMAP4_MMC_REG_OFFSET;
 321         else
 322                 mmc->reg_offset = 0;
 323
 324         mmc->get_context_loss_count = hsmmc_get_context_loss;
 325
 326         mmc->slots[0].switch_pin = c->gpio_cd;
 327         mmc->slots[0].gpio_wp = c->gpio_wp;
 328
 329         mmc->slots[0].remux = c->remux;
 330         mmc->slots[0].init_card = c->init_card;
 331
 332         if (c->cover_only)
 333                 mmc->slots[0].cover = 1;
 334
 335         if (c->nonremovable)
 336                 mmc->slots[0].nonremovable = 1;
 337
 338         if (c->power_saving)
 339                 mmc->slots[0].power_saving = 1;
 340
 341         if (c->no_off)
 342                 mmc->slots[0].no_off = 1;
 343
 344         if (c->no_off_init)
 345                 mmc->slots[0].no_regulator_off_init = c->no_off_init;
 346
 347         if (c->vcc_aux_disable_is_sleep)
 348                 mmc->slots[0].vcc_aux_disable_is_sleep = 1;
 349
 350         /*
 351          * NOTE:  MMC slots should have a Vcc regulator set up.
 352          * This may be from a TWL4030-family chip, another
 353          * controllable regulator, or a fixed supply.
 354          *
 355          * temporary HACK: ocr_mask instead of fixed supply
 356          */
 357         if (cpu_is_omap3505() || cpu_is_omap3517())
 358                 mmc->slots[0].ocr_mask = MMC_VDD_165_195 |
 359                                          MMC_VDD_26_27 |
 360                                          MMC_VDD_27_28 |
 361                                          MMC_VDD_29_30 |
 362                                          MMC_VDD_30_31 |
 363                                          MMC_VDD_31_32;
 364         else
 365                 mmc->slots[0].ocr_mask = c->ocr_mask;
 366
 367         if (!cpu_is_omap3517() && !cpu_is_omap3505())
 368                 mmc->slots[0].features |= HSMMC_HAS_PBIAS;
 369
 370         if (cpu_is_omap44xx() && (omap_rev() > OMAP4430_REV_ES1_0))
 371                 mmc->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
 372
 373         switch (c->mmc) {
 374         case 1:
 375                 if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
 376                         /* on-chip level shifting via PBIAS0/PBIAS1 */
 377                         if (cpu_is_omap44xx()) {
 378                                 mmc->slots[0].before_set_reg =
 379                                                 omap4_hsmmc1_before_set_reg;
 380                                 mmc->slots[0].after_set_reg =
 381                                                 omap4_hsmmc1_after_set_reg;
 382                         } else {
 383                                 mmc->slots[0].before_set_reg =
 384                                                 omap_hsmmc1_before_set_reg;
 385                                 mmc->slots[0].after_set_reg =
 386                                                 omap_hsmmc1_after_set_reg;
 387                         }
 388                 }
 389
 390                 if (cpu_is_omap3517() || cpu_is_omap3505())
 391                         mmc->slots[0].set_power = nop_mmc_set_power;
 392
 393                 /* OMAP3630 HSMMC1 supports only 4-bit */
 394                 if (cpu_is_omap3630() &&
 395                                 (c->caps & MMC_CAP_8_BIT_DATA)) {
 396                         c->caps &= ~MMC_CAP_8_BIT_DATA;
 397                         c->caps |= MMC_CAP_4_BIT_DATA;
 398                         mmc->slots[0].caps = c->caps;
 399                 }
 400                 break;
 401         case 2:
 402                 if (cpu_is_omap3517() || cpu_is_omap3505())
 403                         mmc->slots[0].set_power = am35x_hsmmc2_set_power;
 404
 405                 if (c->ext_clock)
 406                         c->transceiver = 1;
 407                 if (c->transceiver && (c->caps & MMC_CAP_8_BIT_DATA)) {
 408                         c->caps &= ~MMC_CAP_8_BIT_DATA;
 409                         c->caps |= MMC_CAP_4_BIT_DATA;
 410                 }
 411                 if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
 412                         /* off-chip level shifting, or none */
 413                         mmc->slots[0].before_set_reg = hsmmc2_before_set_reg;
 414                         mmc->slots[0].after_set_reg = NULL;
 415                 }
 416                 break;
 417         case 3:
 418         case 4:
 419         case 5:
 420                 mmc->slots[0].before_set_reg = NULL;
 421                 mmc->slots[0].after_set_reg = NULL;
 422                 break;
 423         default:
 424                 pr_err("MMC%d configuration not supported!\n", c->mmc);
 425                 kfree(hc_name);
 426                 return -ENODEV;
 427         }
 428         return 0;
 429 }
 430
 431 static int omap_hsmmc_done;
 432 #define MAX_OMAP_MMC_HWMOD_NAME_LEN             16
 433
 434 void omap_init_hsmmc(struct omap2_hsmmc_info *hsmmcinfo, int ctrl_nr)
 435 {
 436         struct omap_hwmod *oh;
 437         struct platform_device *pdev;
 438         char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
 439         struct omap_mmc_platform_data *mmc_data;
 440         struct omap_mmc_dev_attr *mmc_dev_attr;
 441         char *name;
 442         int l;
 443
 444         mmc_data = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
 445         if (!mmc_data) {
 446                 pr_err("Cannot allocate memory for mmc device!\n");
 447                 goto done;
 448         }
 449
 450         if (omap_hsmmc_pdata_init(hsmmcinfo, mmc_data) < 0) {
 451                 pr_err("%s fails!\n", __func__);
 452                 goto done;
 453         }
 454         omap_hsmmc_mux(mmc_data, (ctrl_nr - 1));
 455
 456         name = "omap_hsmmc";
 457
 458         l = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
 459                      "mmc%d", ctrl_nr);
 460         WARN(l >= MAX_OMAP_MMC_HWMOD_NAME_LEN,
 461              "String buffer overflow in MMC%d device setup\n", ctrl_nr);
 462         oh = omap_hwmod_lookup(oh_name);
 463         if (!oh) {
 464                 pr_err("Could not look up %s\n", oh_name);
 465                 kfree(mmc_data->slots[0].name);
 466                 goto done;
 467         }
 468
 469         if (oh->dev_attr != NULL) {
 470                 mmc_dev_attr = oh->dev_attr;
 471                 mmc_data->controller_flags = mmc_dev_attr->flags;
 472         }
 473
 474         pdev = omap_device_build(name, ctrl_nr - 1, oh, mmc_data,
 475                 sizeof(struct omap_mmc_platform_data), NULL, 0, false);
 476         if (IS_ERR(pdev)) {
 477                 WARN(1, "Can't build omap_device for %s:%s.\n", name, oh->name);
 478                 kfree(mmc_data->slots[0].name);
 479                 goto done;
 480         }
 481         /*
 482          * return device handle to board setup code
 483          * required to populate for regulator framework structure
 484          */
 485         hsmmcinfo->dev = &pdev->dev;
 486
 487 done:
 488         kfree(mmc_data);
 489 }
 490
 491 void omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
 492 {
 493         u32 reg;
 494
 495         if (omap_hsmmc_done)
 496                 return;
 497
 498         omap_hsmmc_done = 1;
 499
 500         if (!cpu_is_omap44xx()) {
 501                 if (cpu_is_omap2430()) {
 502                         control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
 503                         control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
 504                 } else {
 505                         control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
 506                         control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
 507                 }
 508         } else {
 509                 control_pbias_offset =
 510                         OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_PBIASLITE;
 511                 control_mmc1 = OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MMC1;
 512                 reg = omap4_ctrl_pad_readl(control_mmc1);
 513                 reg |= (OMAP4_SDMMC1_PUSTRENGTH_GRP0_MASK |
 514                         OMAP4_SDMMC1_PUSTRENGTH_GRP1_MASK);
 515                 reg &= ~(OMAP4_SDMMC1_PUSTRENGTH_GRP2_MASK |
 516                         OMAP4_SDMMC1_PUSTRENGTH_GRP3_MASK);
 517                 reg |= (OMAP4_SDMMC1_DR0_SPEEDCTRL_MASK |
 518                         OMAP4_SDMMC1_DR1_SPEEDCTRL_MASK |
 519                         OMAP4_SDMMC1_DR2_SPEEDCTRL_MASK);
 520                 omap4_ctrl_pad_writel(reg, control_mmc1);
 521         }
 522
 523         for (; controllers->mmc; controllers++)
 524                 omap_init_hsmmc(controllers, controllers->mmc);
 525
 526 }
 527
 528 #endif