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 <linux/mmc/host.h>
  18 #include <linux/platform_data/gpio-omap.h>
  19 #include <linux/platform_data/hsmmc-omap.h>
  20
  21 #include "soc.h"
  22 #include "omap_device.h"
  23 #include "omap-pm.h"
  24
  25 #include "mux.h"
  26 #include "hsmmc.h"
  27 #include "control.h"
  28
  29 #if defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE)
  30
  31 static u16 control_pbias_offset;
  32 static u16 control_devconf1_offset;
  33
  34 #define HSMMC_NAME_LEN  9
  35
  36 static void omap_hsmmc1_before_set_reg(struct device *dev,
  37                                        int power_on, int vdd)
  38 {
  39         u32 reg, prog_io;
  40         struct omap_hsmmc_platform_data *mmc = dev->platform_data;
  41
  42         if (mmc->remux)
  43                 mmc->remux(dev, power_on);
  44
  45         /*
  46          * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
  47          * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
  48          * 1.8V and 3.0V modes, controlled by the PBIAS register.
  49          *
  50          * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
  51          * is most naturally TWL VSIM; those pins also use PBIAS.
  52          *
  53          * FIXME handle VMMC1A as needed ...
  54          */
  55         if (power_on) {
  56                 if (cpu_is_omap2430()) {
  57                         reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
  58                         if ((1 << vdd) >= MMC_VDD_30_31)
  59                                 reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
  60                         else
  61                                 reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
  62                         omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
  63                 }
  64
  65                 if (mmc->internal_clock) {
  66                         reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
  67                         reg |= OMAP2_MMCSDIO1ADPCLKISEL;
  68                         omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
  69                 }
  70
  71                 reg = omap_ctrl_readl(control_pbias_offset);
  72                 if (cpu_is_omap3630()) {
  73                         /* Set MMC I/O to 52MHz */
  74                         prog_io = omap_ctrl_readl(OMAP343X_CONTROL_PROG_IO1);
  75                         prog_io |= OMAP3630_PRG_SDMMC1_SPEEDCTRL;
  76                         omap_ctrl_writel(prog_io, OMAP343X_CONTROL_PROG_IO1);
  77                 } else {
  78                         reg |= OMAP2_PBIASSPEEDCTRL0;
  79                 }
  80                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
  81                 omap_ctrl_writel(reg, control_pbias_offset);
  82         } else {
  83                 reg = omap_ctrl_readl(control_pbias_offset);
  84                 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
  85                 omap_ctrl_writel(reg, control_pbias_offset);
  86         }
  87 }
  88
  89 static void omap_hsmmc1_after_set_reg(struct device *dev, int power_on, int vdd)
  90 {
  91         u32 reg;
  92
  93         /* 100ms delay required for PBIAS configuration */
  94         msleep(100);
  95
  96         if (power_on) {
  97                 reg = omap_ctrl_readl(control_pbias_offset);
  98                 reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
  99                 if ((1 << vdd) <= MMC_VDD_165_195)
 100                         reg &= ~OMAP2_PBIASLITEVMODE0;
 101                 else
 102                         reg |= OMAP2_PBIASLITEVMODE0;
 103                 omap_ctrl_writel(reg, control_pbias_offset);
 104         } else {
 105                 reg = omap_ctrl_readl(control_pbias_offset);
 106                 reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
 107                         OMAP2_PBIASLITEVMODE0);
 108                 omap_ctrl_writel(reg, control_pbias_offset);
 109         }
 110 }
 111
 112 static void hsmmc2_select_input_clk_src(struct omap_hsmmc_platform_data *mmc)
 113 {
 114         u32 reg;
 115
 116         reg = omap_ctrl_readl(control_devconf1_offset);
 117         if (mmc->internal_clock)
 118                 reg |= OMAP2_MMCSDIO2ADPCLKISEL;
 119         else
 120                 reg &= ~OMAP2_MMCSDIO2ADPCLKISEL;
 121         omap_ctrl_writel(reg, control_devconf1_offset);
 122 }
 123
 124 static void hsmmc2_before_set_reg(struct device *dev, int power_on, int vdd)
 125 {
 126         struct omap_hsmmc_platform_data *mmc = dev->platform_data;
 127
 128         if (mmc->remux)
 129                 mmc->remux(dev, power_on);
 130
 131         if (power_on)
 132                 hsmmc2_select_input_clk_src(mmc);
 133 }
 134
 135 static int am35x_hsmmc2_set_power(struct device *dev, int power_on, int vdd)
 136 {
 137         struct omap_hsmmc_platform_data *mmc = dev->platform_data;
 138
 139         if (power_on)
 140                 hsmmc2_select_input_clk_src(mmc);
 141
 142         return 0;
 143 }
 144
 145 static int nop_mmc_set_power(struct device *dev, int power_on, int vdd)
 146 {
 147         return 0;
 148 }
 149
 150 static inline void omap_hsmmc_mux(struct omap_hsmmc_platform_data
 151                                   *mmc_controller, int controller_nr)
 152 {
 153         if (gpio_is_valid(mmc_controller->gpio_cd) &&
 154             (mmc_controller->gpio_cd < OMAP_MAX_GPIO_LINES))
 155                 omap_mux_init_gpio(mmc_controller->gpio_cd,
 156                                    OMAP_PIN_INPUT_PULLUP);
 157         if (gpio_is_valid(mmc_controller->gpio_cod) &&
 158             (mmc_controller->gpio_cod < OMAP_MAX_GPIO_LINES))
 159                 omap_mux_init_gpio(mmc_controller->gpio_cod,
 160                                    OMAP_PIN_INPUT_PULLUP);
 161         if (gpio_is_valid(mmc_controller->gpio_wp) &&
 162             (mmc_controller->gpio_wp < OMAP_MAX_GPIO_LINES))
 163                 omap_mux_init_gpio(mmc_controller->gpio_wp,
 164                                    OMAP_PIN_INPUT_PULLUP);
 165         if (cpu_is_omap34xx()) {
 166                 if (controller_nr == 0) {
 167                         omap_mux_init_signal("sdmmc1_clk",
 168                                 OMAP_PIN_INPUT_PULLUP);
 169                         omap_mux_init_signal("sdmmc1_cmd",
 170                                 OMAP_PIN_INPUT_PULLUP);
 171                         omap_mux_init_signal("sdmmc1_dat0",
 172                                 OMAP_PIN_INPUT_PULLUP);
 173                         if (mmc_controller->caps &
 174                                 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
 175                                 omap_mux_init_signal("sdmmc1_dat1",
 176                                         OMAP_PIN_INPUT_PULLUP);
 177                                 omap_mux_init_signal("sdmmc1_dat2",
 178                                         OMAP_PIN_INPUT_PULLUP);
 179                                 omap_mux_init_signal("sdmmc1_dat3",
 180                                         OMAP_PIN_INPUT_PULLUP);
 181                         }
 182                         if (mmc_controller->caps &
 183                                                 MMC_CAP_8_BIT_DATA) {
 184                                 omap_mux_init_signal("sdmmc1_dat4",
 185                                         OMAP_PIN_INPUT_PULLUP);
 186                                 omap_mux_init_signal("sdmmc1_dat5",
 187                                         OMAP_PIN_INPUT_PULLUP);
 188                                 omap_mux_init_signal("sdmmc1_dat6",
 189                                         OMAP_PIN_INPUT_PULLUP);
 190                                 omap_mux_init_signal("sdmmc1_dat7",
 191                                         OMAP_PIN_INPUT_PULLUP);
 192                         }
 193                 }
 194                 if (controller_nr == 1) {
 195                         /* MMC2 */
 196                         omap_mux_init_signal("sdmmc2_clk",
 197                                 OMAP_PIN_INPUT_PULLUP);
 198                         omap_mux_init_signal("sdmmc2_cmd",
 199                                 OMAP_PIN_INPUT_PULLUP);
 200                         omap_mux_init_signal("sdmmc2_dat0",
 201                                 OMAP_PIN_INPUT_PULLUP);
 202
 203                         /*
 204                          * For 8 wire configurations, Lines DAT4, 5, 6 and 7
 205                          * need to be muxed in the board-*.c files
 206                          */
 207                         if (mmc_controller->caps &
 208                                 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
 209                                 omap_mux_init_signal("sdmmc2_dat1",
 210                                         OMAP_PIN_INPUT_PULLUP);
 211                                 omap_mux_init_signal("sdmmc2_dat2",
 212                                         OMAP_PIN_INPUT_PULLUP);
 213                                 omap_mux_init_signal("sdmmc2_dat3",
 214                                         OMAP_PIN_INPUT_PULLUP);
 215                         }
 216                         if (mmc_controller->caps &
 217                                                         MMC_CAP_8_BIT_DATA) {
 218                                 omap_mux_init_signal("sdmmc2_dat4.sdmmc2_dat4",
 219                                         OMAP_PIN_INPUT_PULLUP);
 220                                 omap_mux_init_signal("sdmmc2_dat5.sdmmc2_dat5",
 221                                         OMAP_PIN_INPUT_PULLUP);
 222                                 omap_mux_init_signal("sdmmc2_dat6.sdmmc2_dat6",
 223                                         OMAP_PIN_INPUT_PULLUP);
 224                                 omap_mux_init_signal("sdmmc2_dat7.sdmmc2_dat7",
 225                                         OMAP_PIN_INPUT_PULLUP);
 226                         }
 227                 }
 228
 229                 /*
 230                  * For MMC3 the pins need to be muxed in the board-*.c files
 231                  */
 232         }
 233 }
 234
 235 static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
 236                                         struct omap_hsmmc_platform_data *mmc)
 237 {
 238         char *hc_name;
 239
 240         hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
 241         if (!hc_name) {
 242                 pr_err("Cannot allocate memory for controller slot name\n");
 243                 kfree(hc_name);
 244                 return -ENOMEM;
 245         }
 246
 247         if (c->name)
 248                 strncpy(hc_name, c->name, HSMMC_NAME_LEN);
 249         else
 250                 snprintf(hc_name, (HSMMC_NAME_LEN + 1), "mmc%islot%i",
 251                                                                 c->mmc, 1);
 252         mmc->name = hc_name;
 253         mmc->caps = c->caps;
 254         mmc->internal_clock = !c->ext_clock;
 255         mmc->reg_offset = 0;
 256
 257         if (c->cover_only) {
 258                 /* detect if mobile phone cover removed */
 259                 mmc->gpio_cd = -EINVAL;
 260                 mmc->gpio_cod = c->gpio_cd;
 261         } else {
 262                 /* card detect pin on the mmc socket itself */
 263                 mmc->gpio_cd = c->gpio_cd;
 264                 mmc->gpio_cod = -EINVAL;
 265         }
 266         mmc->gpio_wp = c->gpio_wp;
 267
 268         mmc->remux = c->remux;
 269         mmc->init_card = c->init_card;
 270
 271         if (c->nonremovable)
 272                 mmc->nonremovable = 1;
 273
 274         /*
 275          * NOTE:  MMC slots should have a Vcc regulator set up.
 276          * This may be from a TWL4030-family chip, another
 277          * controllable regulator, or a fixed supply.
 278          *
 279          * temporary HACK: ocr_mask instead of fixed supply
 280          */
 281         if (soc_is_am35xx())
 282                 mmc->ocr_mask = MMC_VDD_165_195 |
 283                                          MMC_VDD_26_27 |
 284                                          MMC_VDD_27_28 |
 285                                          MMC_VDD_29_30 |
 286                                          MMC_VDD_30_31 |
 287                                          MMC_VDD_31_32;
 288         else
 289                 mmc->ocr_mask = c->ocr_mask;
 290
 291         if (!soc_is_am35xx())
 292                 mmc->features |= HSMMC_HAS_PBIAS;
 293
 294         switch (c->mmc) {
 295         case 1:
 296                 if (mmc->features & HSMMC_HAS_PBIAS) {
 297                         /* on-chip level shifting via PBIAS0/PBIAS1 */
 298                         mmc->before_set_reg =
 299                                         omap_hsmmc1_before_set_reg;
 300                         mmc->after_set_reg =
 301                                         omap_hsmmc1_after_set_reg;
 302                 }
 303
 304                 if (soc_is_am35xx())
 305                         mmc->set_power = nop_mmc_set_power;
 306
 307                 /* OMAP3630 HSMMC1 supports only 4-bit */
 308                 if (cpu_is_omap3630() &&
 309                                 (c->caps & MMC_CAP_8_BIT_DATA)) {
 310                         c->caps &= ~MMC_CAP_8_BIT_DATA;
 311                         c->caps |= MMC_CAP_4_BIT_DATA;
 312                         mmc->caps = c->caps;
 313                 }
 314                 break;
 315         case 2:
 316                 if (soc_is_am35xx())
 317                         mmc->set_power = am35x_hsmmc2_set_power;
 318
 319                 if (c->ext_clock)
 320                         c->transceiver = 1;
 321                 if (c->transceiver && (c->caps & MMC_CAP_8_BIT_DATA)) {
 322                         c->caps &= ~MMC_CAP_8_BIT_DATA;
 323                         c->caps |= MMC_CAP_4_BIT_DATA;
 324                 }
 325                 if (mmc->features & HSMMC_HAS_PBIAS) {
 326                         /* off-chip level shifting, or none */
 327                         mmc->before_set_reg = hsmmc2_before_set_reg;
 328                         mmc->after_set_reg = NULL;
 329                 }
 330                 break;
 331         case 3:
 332         case 4:
 333         case 5:
 334                 mmc->before_set_reg = NULL;
 335                 mmc->after_set_reg = NULL;
 336                 break;
 337         default:
 338                 pr_err("MMC%d configuration not supported!\n", c->mmc);
 339                 kfree(hc_name);
 340                 return -ENODEV;
 341         }
 342         return 0;
 343 }
 344
 345 static int omap_hsmmc_done;
 346
 347 void omap_hsmmc_late_init(struct omap2_hsmmc_info *c)
 348 {
 349         struct platform_device *pdev;
 350         struct omap_hsmmc_platform_data *mmc_pdata;
 351         int res;
 352
 353         if (omap_hsmmc_done != 1)
 354                 return;
 355
 356         omap_hsmmc_done++;
 357
 358         for (; c->mmc; c++) {
 359                 if (!c->deferred)
 360                         continue;
 361
 362                 pdev = c->pdev;
 363                 if (!pdev)
 364                         continue;
 365
 366                 mmc_pdata = pdev->dev.platform_data;
 367                 if (!mmc_pdata)
 368                         continue;
 369
 370                 if (c->cover_only) {
 371                         /* detect if mobile phone cover removed */
 372                         mmc_pdata->gpio_cd = -EINVAL;
 373                         mmc_pdata->gpio_cod = c->gpio_cd;
 374                 } else {
 375                         /* card detect pin on the mmc socket itself */
 376                         mmc_pdata->gpio_cd = c->gpio_cd;
 377                         mmc_pdata->gpio_cod = -EINVAL;
 378                 }
 379                 mmc_pdata->gpio_wp = c->gpio_wp;
 380
 381                 res = omap_device_register(pdev);
 382                 if (res)
 383                         pr_err("Could not late init MMC %s\n",
 384                                c->name);
 385         }
 386 }
 387
 388 #define MAX_OMAP_MMC_HWMOD_NAME_LEN             16
 389
 390 static void __init omap_hsmmc_init_one(struct omap2_hsmmc_info *hsmmcinfo,
 391                                         int ctrl_nr)
 392 {
 393         struct omap_hwmod *oh;
 394         struct omap_hwmod *ohs[1];
 395         struct omap_device *od;
 396         struct platform_device *pdev;
 397         char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
 398         struct omap_hsmmc_platform_data *mmc_data;
 399         struct omap_hsmmc_dev_attr *mmc_dev_attr;
 400         char *name;
 401         int res;
 402
 403         mmc_data = kzalloc(sizeof(*mmc_data), GFP_KERNEL);
 404         if (!mmc_data) {
 405                 pr_err("Cannot allocate memory for mmc device!\n");
 406                 return;
 407         }
 408
 409         res = omap_hsmmc_pdata_init(hsmmcinfo, mmc_data);
 410         if (res < 0)
 411                 goto free_mmc;
 412
 413         omap_hsmmc_mux(mmc_data, (ctrl_nr - 1));
 414
 415         name = "omap_hsmmc";
 416         res = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
 417                      "mmc%d", ctrl_nr);
 418         WARN(res >= MAX_OMAP_MMC_HWMOD_NAME_LEN,
 419              "String buffer overflow in MMC%d device setup\n", ctrl_nr);
 420
 421         oh = omap_hwmod_lookup(oh_name);
 422         if (!oh) {
 423                 pr_err("Could not look up %s\n", oh_name);
 424                 goto free_name;
 425         }
 426         ohs[0] = oh;
 427         if (oh->dev_attr != NULL) {
 428                 mmc_dev_attr = oh->dev_attr;
 429                 mmc_data->controller_flags = mmc_dev_attr->flags;
 430                 /*
 431                  * erratum 2.1.1.128 doesn't apply if board has
 432                  * a transceiver is attached
 433                  */
 434                 if (hsmmcinfo->transceiver)
 435                         mmc_data->controller_flags &=
 436                                 ~OMAP_HSMMC_BROKEN_MULTIBLOCK_READ;
 437         }
 438
 439         pdev = platform_device_alloc(name, ctrl_nr - 1);
 440         if (!pdev) {
 441                 pr_err("Could not allocate pdev for %s\n", name);
 442                 goto free_name;
 443         }
 444         dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
 445
 446         od = omap_device_alloc(pdev, ohs, 1);
 447         if (IS_ERR(od)) {
 448                 pr_err("Could not allocate od for %s\n", name);
 449                 goto put_pdev;
 450         }
 451
 452         res = platform_device_add_data(pdev, mmc_data,
 453                               sizeof(struct omap_hsmmc_platform_data));
 454         if (res) {
 455                 pr_err("Could not add pdata for %s\n", name);
 456                 goto put_pdev;
 457         }
 458
 459         hsmmcinfo->pdev = pdev;
 460
 461         if (hsmmcinfo->deferred)
 462                 goto free_mmc;
 463
 464         res = omap_device_register(pdev);
 465         if (res) {
 466                 pr_err("Could not register od for %s\n", name);
 467                 goto free_od;
 468         }
 469
 470         goto free_mmc;
 471
 472 free_od:
 473         omap_device_delete(od);
 474
 475 put_pdev:
 476         platform_device_put(pdev);
 477
 478 free_name:
 479         kfree(mmc_data->name);
 480
 481 free_mmc:
 482         kfree(mmc_data);
 483 }
 484
 485 void __init omap_hsmmc_init(struct omap2_hsmmc_info *controllers)
 486 {
 487         if (omap_hsmmc_done)
 488                 return;
 489
 490         omap_hsmmc_done = 1;
 491
 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
 500         for (; controllers->mmc; controllers++)
 501                 omap_hsmmc_init_one(controllers, controllers->mmc);
 502
 503 }
 504
 505 #endif