drivers/mmc/host/sdhci-tegra.c

   1 /*
   2  * Copyright (C) 2010 Google, Inc.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/clk.h>
  20 #include <linux/io.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23 #include <linux/of_gpio.h>
  24 #include <linux/gpio.h>
  25 #include <linux/mmc/card.h>
  26 #include <linux/mmc/host.h>
  27
  28 #include <asm/gpio.h>
  29
  30 #include <mach/gpio-tegra.h>
  31 #include <mach/sdhci.h>
  32
  33 #include "sdhci-pltfm.h"
  34
  35 #define NVQUIRK_FORCE_SDHCI_SPEC_200    BIT(0)
  36 #define NVQUIRK_ENABLE_BLOCK_GAP_DET    BIT(1)
  37
  38 struct sdhci_tegra_soc_data {
  39         struct sdhci_pltfm_data *pdata;
  40         u32 nvquirks;
  41 };
  42
  43 struct sdhci_tegra {
  44         const struct tegra_sdhci_platform_data *plat;
  45         const struct sdhci_tegra_soc_data *soc_data;
  46 };
  47
  48 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
  49 {
  50         u32 val;
  51
  52         if (unlikely(reg == SDHCI_PRESENT_STATE)) {
  53                 /* Use wp_gpio here instead? */
  54                 val = readl(host->ioaddr + reg);
  55                 return val | SDHCI_WRITE_PROTECT;
  56         }
  57
  58         return readl(host->ioaddr + reg);
  59 }
  60
  61 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
  62 {
  63         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  64         struct sdhci_tegra *tegra_host = pltfm_host->priv;
  65         const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
  66
  67         if (unlikely((soc_data->nvquirks & NVQUIRK_FORCE_SDHCI_SPEC_200) &&
  68                         (reg == SDHCI_HOST_VERSION))) {
  69                 /* Erratum: Version register is invalid in HW. */
  70                 return SDHCI_SPEC_200;
  71         }
  72
  73         return readw(host->ioaddr + reg);
  74 }
  75
  76 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
  77 {
  78         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  79         struct sdhci_tegra *tegra_host = pltfm_host->priv;
  80         const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
  81
  82         /* Seems like we're getting spurious timeout and crc errors, so
  83          * disable signalling of them. In case of real errors software
  84          * timers should take care of eventually detecting them.
  85          */
  86         if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
  87                 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
  88
  89         writel(val, host->ioaddr + reg);
  90
  91         if (unlikely((soc_data->nvquirks & NVQUIRK_ENABLE_BLOCK_GAP_DET) &&
  92                         (reg == SDHCI_INT_ENABLE))) {
  93                 /* Erratum: Must enable block gap interrupt detection */
  94                 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
  95                 if (val & SDHCI_INT_CARD_INT)
  96                         gap_ctrl |= 0x8;
  97                 else
  98                         gap_ctrl &= ~0x8;
  99                 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
 100         }
 101 }
 102
 103 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *host)
 104 {
 105         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 106         struct sdhci_tegra *tegra_host = pltfm_host->priv;
 107         const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
 108
 109         if (!gpio_is_valid(plat->wp_gpio))
 110                 return -1;
 111
 112         return gpio_get_value(plat->wp_gpio);
 113 }
 114
 115 static irqreturn_t carddetect_irq(int irq, void *data)
 116 {
 117         struct sdhci_host *sdhost = (struct sdhci_host *)data;
 118
 119         tasklet_schedule(&sdhost->card_tasklet);
 120         return IRQ_HANDLED;
 121 };
 122
 123 static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
 124 {
 125         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 126         struct sdhci_tegra *tegra_host = pltfm_host->priv;
 127         const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
 128         u32 ctrl;
 129
 130         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
 131         if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
 132                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 133                 ctrl |= SDHCI_CTRL_8BITBUS;
 134         } else {
 135                 ctrl &= ~SDHCI_CTRL_8BITBUS;
 136                 if (bus_width == MMC_BUS_WIDTH_4)
 137                         ctrl |= SDHCI_CTRL_4BITBUS;
 138                 else
 139                         ctrl &= ~SDHCI_CTRL_4BITBUS;
 140         }
 141         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 142         return 0;
 143 }
 144
 145 static struct sdhci_ops tegra_sdhci_ops = {
 146         .get_ro     = tegra_sdhci_get_ro,
 147         .read_l     = tegra_sdhci_readl,
 148         .read_w     = tegra_sdhci_readw,
 149         .write_l    = tegra_sdhci_writel,
 150         .platform_8bit_width = tegra_sdhci_8bit,
 151 };
 152
 153 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
 154 static struct sdhci_pltfm_data sdhci_tegra20_pdata = {
 155         .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
 156                   SDHCI_QUIRK_SINGLE_POWER_WRITE |
 157                   SDHCI_QUIRK_NO_HISPD_BIT |
 158                   SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
 159         .ops  = &tegra_sdhci_ops,
 160 };
 161
 162 static struct sdhci_tegra_soc_data soc_data_tegra20 = {
 163         .pdata = &sdhci_tegra20_pdata,
 164         .nvquirks = NVQUIRK_FORCE_SDHCI_SPEC_200 |
 165                     NVQUIRK_ENABLE_BLOCK_GAP_DET,
 166 };
 167 #endif
 168
 169 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 170 static struct sdhci_pltfm_data sdhci_tegra30_pdata = {
 171         .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
 172                   SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
 173                   SDHCI_QUIRK_SINGLE_POWER_WRITE |
 174                   SDHCI_QUIRK_NO_HISPD_BIT |
 175                   SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
 176         .ops  = &tegra_sdhci_ops,
 177 };
 178
 179 static struct sdhci_tegra_soc_data soc_data_tegra30 = {
 180         .pdata = &sdhci_tegra30_pdata,
 181 };
 182 #endif
 183
 184 static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
 185 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 186         { .compatible = "nvidia,tegra30-sdhci", .data = &soc_data_tegra30 },
 187 #endif
 188 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
 189         { .compatible = "nvidia,tegra20-sdhci", .data = &soc_data_tegra20 },
 190 #endif
 191         {}
 192 };
 193 MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
 194
 195 static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
 196                                                 struct platform_device *pdev)
 197 {
 198         struct tegra_sdhci_platform_data *plat;
 199         struct device_node *np = pdev->dev.of_node;
 200
 201         if (!np)
 202                 return NULL;
 203
 204         plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
 205         if (!plat) {
 206                 dev_err(&pdev->dev, "Can't allocate platform data\n");
 207                 return NULL;
 208         }
 209
 210         plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
 211         plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
 212         plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
 213         if (of_find_property(np, "support-8bit", NULL))
 214                 plat->is_8bit = 1;
 215
 216         return plat;
 217 }
 218
 219 static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
 220 {
 221         const struct of_device_id *match;
 222         const struct sdhci_tegra_soc_data *soc_data;
 223         struct sdhci_host *host;
 224         struct sdhci_pltfm_host *pltfm_host;
 225         struct tegra_sdhci_platform_data *plat;
 226         struct sdhci_tegra *tegra_host;
 227         struct clk *clk;
 228         int rc;
 229
 230         match = of_match_device(sdhci_tegra_dt_match, &pdev->dev);
 231         if (match)
 232                 soc_data = match->data;
 233         else
 234                 soc_data = &soc_data_tegra20;
 235
 236         host = sdhci_pltfm_init(pdev, soc_data->pdata);
 237         if (IS_ERR(host))
 238                 return PTR_ERR(host);
 239
 240         pltfm_host = sdhci_priv(host);
 241
 242         plat = pdev->dev.platform_data;
 243
 244         if (plat == NULL)
 245                 plat = sdhci_tegra_dt_parse_pdata(pdev);
 246
 247         if (plat == NULL) {
 248                 dev_err(mmc_dev(host->mmc), "missing platform data\n");
 249                 rc = -ENXIO;
 250                 goto err_no_plat;
 251         }
 252
 253         tegra_host = devm_kzalloc(&pdev->dev, sizeof(*tegra_host), GFP_KERNEL);
 254         if (!tegra_host) {
 255                 dev_err(mmc_dev(host->mmc), "failed to allocate tegra_host\n");
 256                 rc = -ENOMEM;
 257                 goto err_no_plat;
 258         }
 259
 260         tegra_host->plat = plat;
 261         tegra_host->soc_data = soc_data;
 262
 263         pltfm_host->priv = tegra_host;
 264
 265         if (gpio_is_valid(plat->power_gpio)) {
 266                 rc = gpio_request(plat->power_gpio, "sdhci_power");
 267                 if (rc) {
 268                         dev_err(mmc_dev(host->mmc),
 269                                 "failed to allocate power gpio\n");
 270                         goto err_power_req;
 271                 }
 272                 tegra_gpio_enable(plat->power_gpio);
 273                 gpio_direction_output(plat->power_gpio, 1);
 274         }
 275
 276         if (gpio_is_valid(plat->cd_gpio)) {
 277                 rc = gpio_request(plat->cd_gpio, "sdhci_cd");
 278                 if (rc) {
 279                         dev_err(mmc_dev(host->mmc),
 280                                 "failed to allocate cd gpio\n");
 281                         goto err_cd_req;
 282                 }
 283                 tegra_gpio_enable(plat->cd_gpio);
 284                 gpio_direction_input(plat->cd_gpio);
 285
 286                 rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
 287                                  IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 288                                  mmc_hostname(host->mmc), host);
 289
 290                 if (rc) {
 291                         dev_err(mmc_dev(host->mmc), "request irq error\n");
 292                         goto err_cd_irq_req;
 293                 }
 294
 295         }
 296
 297         if (gpio_is_valid(plat->wp_gpio)) {
 298                 rc = gpio_request(plat->wp_gpio, "sdhci_wp");
 299                 if (rc) {
 300                         dev_err(mmc_dev(host->mmc),
 301                                 "failed to allocate wp gpio\n");
 302                         goto err_wp_req;
 303                 }
 304                 tegra_gpio_enable(plat->wp_gpio);
 305                 gpio_direction_input(plat->wp_gpio);
 306         }
 307
 308         clk = clk_get(mmc_dev(host->mmc), NULL);
 309         if (IS_ERR(clk)) {
 310                 dev_err(mmc_dev(host->mmc), "clk err\n");
 311                 rc = PTR_ERR(clk);
 312                 goto err_clk_get;
 313         }
 314         clk_enable(clk);
 315         pltfm_host->clk = clk;
 316
 317         host->mmc->pm_caps = plat->pm_flags;
 318
 319         if (plat->is_8bit)
 320                 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
 321
 322         rc = sdhci_add_host(host);
 323         if (rc)
 324                 goto err_add_host;
 325
 326         return 0;
 327
 328 err_add_host:
 329         clk_disable(pltfm_host->clk);
 330         clk_put(pltfm_host->clk);
 331 err_clk_get:
 332         if (gpio_is_valid(plat->wp_gpio)) {
 333                 tegra_gpio_disable(plat->wp_gpio);
 334                 gpio_free(plat->wp_gpio);
 335         }
 336 err_wp_req:
 337         if (gpio_is_valid(plat->cd_gpio))
 338                 free_irq(gpio_to_irq(plat->cd_gpio), host);
 339 err_cd_irq_req:
 340         if (gpio_is_valid(plat->cd_gpio)) {
 341                 tegra_gpio_disable(plat->cd_gpio);
 342                 gpio_free(plat->cd_gpio);
 343         }
 344 err_cd_req:
 345         if (gpio_is_valid(plat->power_gpio)) {
 346                 tegra_gpio_disable(plat->power_gpio);
 347                 gpio_free(plat->power_gpio);
 348         }
 349 err_power_req:
 350 err_no_plat:
 351         sdhci_pltfm_free(pdev);
 352         return rc;
 353 }
 354
 355 static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
 356 {
 357         struct sdhci_host *host = platform_get_drvdata(pdev);
 358         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 359         struct sdhci_tegra *tegra_host = pltfm_host->priv;
 360         const struct tegra_sdhci_platform_data *plat = tegra_host->plat;
 361         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 362
 363         sdhci_remove_host(host, dead);
 364
 365         if (gpio_is_valid(plat->wp_gpio)) {
 366                 tegra_gpio_disable(plat->wp_gpio);
 367                 gpio_free(plat->wp_gpio);
 368         }
 369
 370         if (gpio_is_valid(plat->cd_gpio)) {
 371                 free_irq(gpio_to_irq(plat->cd_gpio), host);
 372                 tegra_gpio_disable(plat->cd_gpio);
 373                 gpio_free(plat->cd_gpio);
 374         }
 375
 376         if (gpio_is_valid(plat->power_gpio)) {
 377                 tegra_gpio_disable(plat->power_gpio);
 378                 gpio_free(plat->power_gpio);
 379         }
 380
 381         clk_disable(pltfm_host->clk);
 382         clk_put(pltfm_host->clk);
 383
 384         sdhci_pltfm_free(pdev);
 385
 386         return 0;
 387 }
 388
 389 static struct platform_driver sdhci_tegra_driver = {
 390         .driver         = {
 391                 .name   = "sdhci-tegra",
 392                 .owner  = THIS_MODULE,
 393                 .of_match_table = sdhci_tegra_dt_match,
 394                 .pm     = SDHCI_PLTFM_PMOPS,
 395         },
 396         .probe          = sdhci_tegra_probe,
 397         .remove         = __devexit_p(sdhci_tegra_remove),
 398 };
 399
 400 module_platform_driver(sdhci_tegra_driver);
 401
 402 MODULE_DESCRIPTION("SDHCI driver for Tegra");
 403 MODULE_AUTHOR("Google, Inc.");
 404 MODULE_LICENSE("GPL v2");