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          * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
 134          * is most naturally TWL VSIM; those pins also use PBIAS.
 135          *
 136          * FIXME handle VMMC1A as needed ...
 137          */
 138         reg = omap4_ctrl_pad_readl(control_pbias_offset);
 139         reg &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
 140                 OMAP4_MMC1_PWRDNZ_MASK);
 141         omap4_ctrl_pad_writel(reg, control_pbias_offset);
 142 }
 143
 144 static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
 145                                  int power_on, int vdd)
 146 {
 147         u32 reg;
 148         unsigned long timeout;
 149
 150         if (power_on) {
 151                 reg = omap4_ctrl_pad_readl(control_pbias_offset);
 152                 reg |= OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK;
 153                 if ((1 << vdd) <= MMC_VDD_165_195)
 154                         reg &= ~OMAP4_MMC1_PBIASLITE_VMODE_MASK;
 155                 else
 156                         reg |= OMAP4_MMC1_PBIASLITE_VMODE_MASK;
 157                 reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
 158                         OMAP4_MMC1_PWRDNZ_MASK);
 159                 omap4_ctrl_pad_writel(reg, control_pbias_offset);
 160
 161                 timeout = jiffies + msecs_to_jiffies(5);
 162                 do {
 163                         reg = omap4_ctrl_pad_readl(control_pbias_offset);
 164                         if (!(reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK))
 165                                 break;
 166                         usleep_range(100, 200);
 167                 } while (!time_after(jiffies, timeout));
 168
 169                 if (reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK) {
 170                         pr_err("Pbias Voltage is not same as LDO\n");
 171                         /* Caution : On VMODE_ERROR Power Down MMC IO */
 172                         reg &= ~(OMAP4_MMC1_PWRDNZ_MASK);
 173                         omap4_ctrl_pad_writel(reg, control_pbias_offset);
 174                 }
 175         } else {
 176                 reg = omap4_ctrl_pad_readl(control_pbias_offset);
 177                 reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
 178                         OMAP4_MMC1_PWRDNZ_MASK |
 179                         OMAP4_MMC1_PBIASLITE_VMODE_MASK);
 180                 omap4_ctrl_pad_writel(reg, control_pbias_offset);
 181         }
 182 }
 183
 184 static void hsmmc23_before_set_reg(struct device *dev, int slot,
 185                                    int power_on, int vdd)
 186 {
 187         struct omap_mmc_platform_data *mmc = dev->platform_data;
 188
 189         if (mmc->slots[0].remux)
 190                 mmc->slots[0].remux(dev, slot, power_on);
 191
 192         if (power_on) {
 193                 /* Only MMC2 supports a CLKIN */
 194                 if (mmc->slots[0].internal_clock) {
 195                         u32 reg;
 196
 197                         reg = omap_ctrl_readl(control_devconf1_offset);
 198                         reg |= OMAP2_MMCSDIO2ADPCLKISEL;
 199                         omap_ctrl_writel(reg, control_devconf1_offset);
 200                 }
 201         }
 202 }
 203
 204 static int nop_mmc_set_power(struct device *dev, int slot, int power_on,
 205                                                         int vdd)
 206 {
 207         return 0;
 208 }
 209
 210 static inline void omap_hsmmc_mux(struct omap_mmc_platform_data *mmc_controller,
 211                         int controller_nr)
 212 {
 213         if (gpio_is_valid(mmc_controller->slots[0].switch_pin))
 214                 omap_mux_init_gpio(mmc_controller->slots[0].switch_pin,
 215                                         OMAP_PIN_INPUT_PULLUP);
 216         if (gpio_is_valid(mmc_controller->slots[0].gpio_wp))
 217                 omap_mux_init_gpio(mmc_controller->slots[0].gpio_wp,
 218                                         OMAP_PIN_INPUT_PULLUP);
 219         if (cpu_is_omap34xx()) {
 220                 if (controller_nr == 0) {
 221                         omap_mux_init_signal("sdmmc1_clk",
 222                                 OMAP_PIN_INPUT_PULLUP);
 223                         omap_mux_init_signal("sdmmc1_cmd",
 224                                 OMAP_PIN_INPUT_PULLUP);
 225                         omap_mux_init_signal("sdmmc1_dat0",
 226                                 OMAP_PIN_INPUT_PULLUP);
 227                         if (mmc_controller->slots[0].caps &
 228                                 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
 229                                 omap_mux_init_signal("sdmmc1_dat1",
 230                                         OMAP_PIN_INPUT_PULLUP);
 231                                 omap_mux_init_signal("sdmmc1_dat2",
 232                                         OMAP_PIN_INPUT_PULLUP);
 233                                 omap_mux_init_signal("sdmmc1_dat3",
 234                                         OMAP_PIN_INPUT_PULLUP);
 235                         }
 236                         if (mmc_controller->slots[0].caps &
 237                                                 MMC_CAP_8_BIT_DATA) {
 238                                 omap_mux_init_signal("sdmmc1_dat4",
 239                                         OMAP_PIN_INPUT_PULLUP);
 240                                 omap_mux_init_signal("sdmmc1_dat5",
 241                                         OMAP_PIN_INPUT_PULLUP);
 242                                 omap_mux_init_signal("sdmmc1_dat6",
 243                                         OMAP_PIN_INPUT_PULLUP);
 244                                 omap_mux_init_signal("sdmmc1_dat7",
 245                                         OMAP_PIN_INPUT_PULLUP);
 246                         }
 247                 }
 248                 if (controller_nr == 1) {
 249                         /* MMC2 */
 250                         omap_mux_init_signal("sdmmc2_clk",
 251                                 OMAP_PIN_INPUT_PULLUP);
 252                         omap_mux_init_signal("sdmmc2_cmd",
 253                                 OMAP_PIN_INPUT_PULLUP);
 254                         omap_mux_init_signal("sdmmc2_dat0",
 255                                 OMAP_PIN_INPUT_PULLUP);
 256
 257                         /*
 258                          * For 8 wire configurations, Lines DAT4, 5, 6 and 7
 259                          * need to be muxed in the board-*.c files
 260                          */
 261                         if (mmc_controller->slots[0].caps &
 262                                 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
 263                                 omap_mux_init_signal("sdmmc2_dat1",
 264                                         OMAP_PIN_INPUT_PULLUP);
 265                                 omap_mux_init_signal("sdmmc2_dat2",
 266                                         OMAP_PIN_INPUT_PULLUP);
 267                                 omap_mux_init_signal("sdmmc2_dat3",
 268                                         OMAP_PIN_INPUT_PULLUP);
 269                         }
 270                         if (mmc_controller->slots[0].caps &
 271                                                         MMC_CAP_8_BIT_DATA) {
 272                                 omap_mux_init_signal("sdmmc2_dat4.sdmmc2_dat4",
 273                                         OMAP_PIN_INPUT_PULLUP);
 274                                 omap_mux_init_signal("sdmmc2_dat5.sdmmc2_dat5",
 275                                         OMAP_PIN_INPUT_PULLUP);
 276                                 omap_mux_init_signal("sdmmc2_dat6.sdmmc2_dat6",
 277                                         OMAP_PIN_INPUT_PULLUP);
 278                                 omap_mux_init_signal("sdmmc2_dat7.sdmmc2_dat7",
 279                                         OMAP_PIN_INPUT_PULLUP);
 280                         }
 281                 }
 282
 283                 /*
 284                  * For MMC3 the pins need to be muxed in the board-*.c files
 285                  */
 286         }
 287 }
 288
 289 static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
 290                                         struct omap_mmc_platform_data *mmc)
 291 {
 292         char *hc_name;
 293
 294         hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
 295         if (!hc_name) {
 296                 pr_err("Cannot allocate memory for controller slot name\n");
 297                 kfree(hc_name);
 298                 return -ENOMEM;
 299         }
 300
 301         if (c->name)
 302                 strncpy(hc_name, c->name, HSMMC_NAME_LEN);
 303         else
 304                 snprintf(hc_name, (HSMMC_NAME_LEN + 1), "mmc%islot%i",
 305                                                                 c->mmc, 1);
 306         mmc->slots[0].name = hc_name;
 307         mmc->nr_slots = 1;
 308         mmc->slots[0].caps = c->caps;
 309         mmc->slots[0].internal_clock = !c->ext_clock;
 310         mmc->dma_mask = 0xffffffff;
 311         if (cpu_is_omap44xx())
 312                 mmc->reg_offset = OMAP4_MMC_REG_OFFSET;
 313         else
 314                 mmc->reg_offset = 0;
 315
 316         mmc->get_context_loss_count = hsmmc_get_context_loss;
 317
 318         mmc->slots[0].switch_pin = c->gpio_cd;
 319         mmc->slots[0].gpio_wp = c->gpio_wp;
 320
 321         mmc->slots[0].remux = c->remux;
 322         mmc->slots[0].init_card = c->init_card;
 323
 324         if (c->cover_only)
 325                 mmc->slots[0].cover = 1;
 326
 327         if (c->nonremovable)
 328                 mmc->slots[0].nonremovable = 1;
 329
 330         if (c->power_saving)
 331                 mmc->slots[0].power_saving = 1;
 332
 333         if (c->no_off)
 334                 mmc->slots[0].no_off = 1;
 335
 336         if (c->no_off_init)
 337                 mmc->slots[0].no_regulator_off_init = c->no_off_init;
 338
 339         if (c->vcc_aux_disable_is_sleep)
 340                 mmc->slots[0].vcc_aux_disable_is_sleep = 1;
 341
 342         /*
 343          * NOTE:  MMC slots should have a Vcc regulator set up.
 344          * This may be from a TWL4030-family chip, another
 345          * controllable regulator, or a fixed supply.
 346          *
 347          * temporary HACK: ocr_mask instead of fixed supply
 348          */
 349         mmc->slots[0].ocr_mask = c->ocr_mask;
 350
 351         if (cpu_is_omap3517() || cpu_is_omap3505())
 352                 mmc->slots[0].set_power = nop_mmc_set_power;
 353         else
 354                 mmc->slots[0].features |= HSMMC_HAS_PBIAS;
 355
 356         if (cpu_is_omap44xx() && (omap_rev() > OMAP4430_REV_ES1_0))
 357                 mmc->slots[0].features |= HSMMC_HAS_UPDATED_RESET;
 358
 359         switch (c->mmc) {
 360         case 1:
 361                 if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
 362                         /* on-chip level shifting via PBIAS0/PBIAS1 */
 363                         if (cpu_is_omap44xx()) {
 364                                 mmc->slots[0].before_set_reg =
 365                                                 omap4_hsmmc1_before_set_reg;
 366                                 mmc->slots[0].after_set_reg =
 367                                                 omap4_hsmmc1_after_set_reg;
 368                         } else {
 369                                 mmc->slots[0].before_set_reg =
 370                                                 omap_hsmmc1_before_set_reg;
 371                                 mmc->slots[0].after_set_reg =
 372                                                 omap_hsmmc1_after_set_reg;
 373                         }
 374                 }
 375
 376                 /* OMAP3630 HSMMC1 supports only 4-bit */
 377                 if (cpu_is_omap3630() &&
 378                                 (c->caps & MMC_CAP_8_BIT_DATA)) {
 379                         c->caps &= ~MMC_CAP_8_BIT_DATA;
 380                         c->caps |= MMC_CAP_4_BIT_DATA;
 381                         mmc->slots[0].caps = c->caps;
 382                 }
 383                 break;
 384         case 2:
 385                 if (c->ext_clock)
 386                         c->transceiver = 1;
 387                 if (c->transceiver && (c->caps & MMC_CAP_8_BIT_DATA)) {
 388                         c->caps &= ~MMC_CAP_8_BIT_DATA;
 389                         c->caps |= MMC_CAP_4_BIT_DATA;
 390                 }
 391                 /* FALLTHROUGH */
 392         case 3:
 393                 if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
 394                         /* off-chip level shifting, or none */
 395                         mmc->slots[0].before_set_reg = hsmmc23_before_set_reg;
 396                         mmc->slots[0].after_set_reg = NULL;
 397                 }
 398                 break;
 399         case 4:
 400         case 5:
 401                 mmc->slots[0].before_set_reg = NULL;
 402                 mmc->slots[0].after_set_reg = NULL;
 403                 break;
 404         default:
 405                 pr_err("MMC%d configuration not supported!\n", c->mmc);
 406                 kfree(hc_name);
 407                 return -ENODEV;
 408         }
 409         return 0;
 410 }
 411
 412 static struct omap_device_pm_latency omap_hsmmc_latency[] = {
 413         [0] = {
 414                 .deactivate_func = omap_device_idle_hwmods,
 415                 .activate_func   = omap_device_enable_hwmods,
 416                 .flags           = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
 417         },
 418         /*
 419          * XXX There should also be an entry here to power off/on the
 420          * MMC regulators/PBIAS cells, etc.
 421          */
 422 };
 423
 424 #define MAX_OMAP_MMC_HWMOD_NAME_LEN             16
 425
 426 void __init omap_init_hsmmc(struct omap2_hsmmc_info *hsmmcinfo, int ctrl_nr)
 427 {
 428         struct omap_hwmod *oh;
 429         struct omap_device *od;
 430         struct omap_device_pm_latency *ohl;
 431         char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
 432         struct omap_mmc_platform_data *mmc_data;
 433         struct omap_mmc_dev_attr *mmc_dev_attr;
 434         char *name;
 435         int l;
 436         int ohl_cnt = 0;
 437
 438         mmc_data = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
 439         if (!mmc_data) {
 440                 pr_err("Cannot allocate memory for mmc device!\n");
 441                 goto done;
 442         }
 443
 444         if (omap_hsmmc_pdata_init(hsmmcinfo, mmc_data) < 0) {
 445                 pr_err("%s fails!\n", __func__);
 446                 goto done;
 447         }
 448         omap_hsmmc_mux(mmc_data, (ctrl_nr - 1));
 449
 450         name = "omap_hsmmc";
 451         ohl = omap_hsmmc_latency;
 452         ohl_cnt = ARRAY_SIZE(omap_hsmmc_latency);
 453
 454         l = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
 455                      "mmc%d", ctrl_nr);
 456         WARN(l >= MAX_OMAP_MMC_HWMOD_NAME_LEN,
 457              "String buffer overflow in MMC%d device setup\n", ctrl_nr);
 458         oh = omap_hwmod_lookup(oh_name);
 459         if (!oh) {
 460                 pr_err("Could not look up %s\n", oh_name);
 461                 kfree(mmc_data->slots[0].name);
 462                 goto done;
 463         }
 464
 465         if (oh->dev_attr != NULL) {
 466                 mmc_dev_attr = oh->dev_attr;
 467                 mmc_data->controller_flags = mmc_dev_attr->flags;
 468         }
 469
 470         od = omap_device_build(name, ctrl_nr - 1, oh, mmc_data,
 471                 sizeof(struct omap_mmc_platform_data), ohl, ohl_cnt, false);
 472         if (IS_ERR(od)) {
 473                 WARN(1, "Can't build omap_device for %s:%s.\n", name, oh->name);
 474                 kfree(mmc_data->slots[0].name);
 475                 goto done;
 476         }
 477         /*
 478          * return device handle to board setup code
 479          * required to populate for regulator framework structure
 480          */
 481         hsmmcinfo->dev = &od->pdev.dev;
 482
 483 done:
 484         kfree(mmc_data);
 485 }
 486
 487 void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
 488 {
 489         u32 reg;
 490
 491         if (!cpu_is_omap44xx()) {
 492                 if (cpu_is_omap2430()) {
 493                         control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
 494                         control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
 495                 } else {
 496                         control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
 497                         control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
 498                 }
 499         } else {
 500                 control_pbias_offset =
 501                         OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_PBIASLITE;
 502                 control_mmc1 = OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MMC1;
 503                 reg = omap4_ctrl_pad_readl(control_mmc1);
 504                 reg |= (OMAP4_SDMMC1_PUSTRENGTH_GRP0_MASK |
 505                         OMAP4_SDMMC1_PUSTRENGTH_GRP1_MASK);
 506                 reg &= ~(OMAP4_SDMMC1_PUSTRENGTH_GRP2_MASK |
 507                         OMAP4_SDMMC1_PUSTRENGTH_GRP3_MASK);
 508                 reg |= (OMAP4_USBC1_DR0_SPEEDCTRL_MASK|
 509                         OMAP4_SDMMC1_DR1_SPEEDCTRL_MASK |
 510                         OMAP4_SDMMC1_DR2_SPEEDCTRL_MASK);
 511                 omap4_ctrl_pad_writel(reg, control_mmc1);
 512         }
 513
 514         for (; controllers->mmc; controllers++)
 515                 omap_init_hsmmc(controllers, controllers->mmc);
 516
 517 }
 518
 519 #endif