drivers/mmc/host/sh_mobile_sdhi.c

   1 /*
   2  * SuperH Mobile SDHI
   3  *
   4  * Copyright (C) 2009 Magnus Damm
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Based on "Compaq ASIC3 support":
  11  *
  12  * Copyright 2001 Compaq Computer Corporation.
  13  * Copyright 2004-2005 Phil Blundell
  14  * Copyright 2007-2008 OpenedHand Ltd.
  15  *
  16  * Authors: Phil Blundell <pb@handhelds.org>,
  17  *          Samuel Ortiz <sameo@openedhand.com>
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/clk.h>
  23 #include <linux/slab.h>
  24 #include <linux/mod_devicetable.h>
  25 #include <linux/module.h>
  26 #include <linux/of_device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/mmc/host.h>
  29 #include <linux/mmc/sh_mobile_sdhi.h>
  30 #include <linux/mfd/tmio.h>
  31 #include <linux/sh_dma.h>
  32 #include <linux/delay.h>
  33
  34 #include "tmio_mmc.h"
  35
  36 #define EXT_ACC           0xe4
  37
  38 struct sh_mobile_sdhi_of_data {
  39         unsigned long tmio_flags;
  40         unsigned long capabilities;
  41         unsigned long capabilities2;
  42         dma_addr_t dma_rx_offset;
  43 };
  44
  45 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
  46         {
  47                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
  48         },
  49 };
  50
  51 static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = {
  52         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
  53                           TMIO_MMC_CLK_ACTUAL,
  54         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
  55 };
  56
  57 static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
  58         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
  59                           TMIO_MMC_CLK_ACTUAL,
  60         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
  61         .dma_rx_offset  = 0x2000,
  62 };
  63
  64 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
  65         { .compatible = "renesas,sdhi-shmobile" },
  66         { .compatible = "renesas,sdhi-sh7372" },
  67         { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
  68         { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
  69         { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
  70         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
  71         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
  72         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
  73         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
  74         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
  75         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
  76         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
  77         {},
  78 };
  79 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
  80
  81 struct sh_mobile_sdhi {
  82         struct clk *clk;
  83         struct tmio_mmc_data mmc_data;
  84         struct tmio_mmc_dma dma_priv;
  85 };
  86
  87 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
  88 {
  89         struct mmc_host *mmc = platform_get_drvdata(pdev);
  90         struct tmio_mmc_host *host = mmc_priv(mmc);
  91         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  92         int ret = clk_prepare_enable(priv->clk);
  93         if (ret < 0)
  94                 return ret;
  95
  96         *f = clk_get_rate(priv->clk);
  97         return 0;
  98 }
  99
 100 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
 101 {
 102         struct mmc_host *mmc = platform_get_drvdata(pdev);
 103         struct tmio_mmc_host *host = mmc_priv(mmc);
 104         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 105         clk_disable_unprepare(priv->clk);
 106 }
 107
 108 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
 109 {
 110         int timeout = 1000;
 111
 112         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
 113                 udelay(1);
 114
 115         if (!timeout) {
 116                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
 117                 return -EBUSY;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 124 {
 125         switch (addr)
 126         {
 127         case CTL_SD_CMD:
 128         case CTL_STOP_INTERNAL_ACTION:
 129         case CTL_XFER_BLK_COUNT:
 130         case CTL_SD_CARD_CLK_CTL:
 131         case CTL_SD_XFER_LEN:
 132         case CTL_SD_MEM_CARD_OPT:
 133         case CTL_TRANSACTION_CTL:
 134         case CTL_DMA_ENABLE:
 135                 return sh_mobile_sdhi_wait_idle(host);
 136         }
 137
 138         return 0;
 139 }
 140
 141 static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
 142                                          unsigned int direction, int blk_size)
 143 {
 144         /*
 145          * In Renesas controllers, when performing a
 146          * multiple block read of one or two blocks,
 147          * depending on the timing with which the
 148          * response register is read, the response
 149          * value may not be read properly.
 150          * Use single block read for this HW bug
 151          */
 152         if ((direction == MMC_DATA_READ) &&
 153             blk_size == 2)
 154                 return 1;
 155
 156         return blk_size;
 157 }
 158
 159 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
 160 {
 161         mmc_detect_change(platform_get_drvdata(pdev), msecs_to_jiffies(100));
 162 }
 163
 164 static const struct sh_mobile_sdhi_ops sdhi_ops = {
 165         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
 166 };
 167
 168 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
 169 {
 170         const struct of_device_id *of_id =
 171                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
 172         struct sh_mobile_sdhi *priv;
 173         struct tmio_mmc_data *mmc_data;
 174         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 175         struct tmio_mmc_host *host;
 176         struct resource *res;
 177         int irq, ret, i = 0;
 178         bool multiplexed_isr = true;
 179         struct tmio_mmc_dma *dma_priv;
 180         u16 ver;
 181
 182         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 183         if (!res)
 184                 return -EINVAL;
 185
 186         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 187         if (priv == NULL) {
 188                 dev_err(&pdev->dev, "kzalloc failed\n");
 189                 return -ENOMEM;
 190         }
 191
 192         mmc_data = &priv->mmc_data;
 193         dma_priv = &priv->dma_priv;
 194
 195         if (p) {
 196                 if (p->init) {
 197                         ret = p->init(pdev, &sdhi_ops);
 198                         if (ret)
 199                                 return ret;
 200                 }
 201         }
 202
 203         priv->clk = devm_clk_get(&pdev->dev, NULL);
 204         if (IS_ERR(priv->clk)) {
 205                 ret = PTR_ERR(priv->clk);
 206                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
 207                 goto eclkget;
 208         }
 209
 210         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
 211         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
 212         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 213         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 214         mmc_data->multi_io_quirk = sh_mobile_sdhi_multi_io_quirk;
 215         if (p) {
 216                 mmc_data->flags = p->tmio_flags;
 217                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 218                 mmc_data->capabilities |= p->tmio_caps;
 219                 mmc_data->capabilities2 |= p->tmio_caps2;
 220                 mmc_data->cd_gpio = p->cd_gpio;
 221
 222                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 223                         /*
 224                          * Yes, we have to provide slave IDs twice to TMIO:
 225                          * once as a filter parameter and once for channel
 226                          * configuration as an explicit slave ID
 227                          */
 228                         dma_priv->chan_priv_tx = (void *)p->dma_slave_tx;
 229                         dma_priv->chan_priv_rx = (void *)p->dma_slave_rx;
 230                         dma_priv->slave_id_tx = p->dma_slave_tx;
 231                         dma_priv->slave_id_rx = p->dma_slave_rx;
 232                 }
 233         }
 234
 235         dma_priv->alignment_shift = 1; /* 2-byte alignment */
 236         dma_priv->filter = shdma_chan_filter;
 237
 238         mmc_data->dma = dma_priv;
 239
 240         /*
 241          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 242          * bus width mode.
 243          */
 244         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 245
 246         /*
 247          * All SDHI blocks support SDIO IRQ signalling.
 248          */
 249         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 250
 251         /*
 252          * All SDHI have CMD12 controll bit
 253          */
 254         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
 255
 256         /*
 257          * All SDHI need SDIO_INFO1 reserved bit
 258          */
 259         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
 260
 261         /*
 262          * All SDHI have DMA control register
 263          */
 264         mmc_data->flags |= TMIO_MMC_HAVE_CTL_DMA_REG;
 265
 266         if (of_id && of_id->data) {
 267                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
 268                 mmc_data->flags |= of_data->tmio_flags;
 269                 mmc_data->capabilities |= of_data->capabilities;
 270                 mmc_data->capabilities2 |= of_data->capabilities2;
 271                 dma_priv->dma_rx_offset = of_data->dma_rx_offset;
 272         }
 273
 274         /* SD control register space size is 0x100, 0x200 for bus_shift=1 */
 275         mmc_data->bus_shift = resource_size(res) >> 9;
 276
 277         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 278         if (ret < 0)
 279                 goto eprobe;
 280
 281         /*
 282          * FIXME:
 283          * this Workaround can be more clever method
 284          */
 285         ver = sd_ctrl_read16(host, CTL_VERSION);
 286         if (ver == 0xCB0D)
 287                 sd_ctrl_write16(host, EXT_ACC, 1);
 288
 289         /*
 290          * Allow one or more specific (named) ISRs or
 291          * one or more multiplexed (un-named) ISRs.
 292          */
 293
 294         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 295         if (irq >= 0) {
 296                 multiplexed_isr = false;
 297                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
 298                                   dev_name(&pdev->dev), host);
 299                 if (ret)
 300                         goto eirq;
 301         }
 302
 303         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 304         if (irq >= 0) {
 305                 multiplexed_isr = false;
 306                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
 307                                   dev_name(&pdev->dev), host);
 308                 if (ret)
 309                         goto eirq;
 310         }
 311
 312         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 313         if (irq >= 0) {
 314                 multiplexed_isr = false;
 315                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
 316                                   dev_name(&pdev->dev), host);
 317                 if (ret)
 318                         goto eirq;
 319         } else if (!multiplexed_isr) {
 320                 dev_err(&pdev->dev,
 321                         "Principal SD-card IRQ is missing among named interrupts\n");
 322                 ret = irq;
 323                 goto eirq;
 324         }
 325
 326         if (multiplexed_isr) {
 327                 while (1) {
 328                         irq = platform_get_irq(pdev, i);
 329                         if (irq < 0)
 330                                 break;
 331                         i++;
 332                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
 333                                           dev_name(&pdev->dev), host);
 334                         if (ret)
 335                                 goto eirq;
 336                 }
 337
 338                 /* There must be at least one IRQ source */
 339                 if (!i) {
 340                         ret = irq;
 341                         goto eirq;
 342                 }
 343         }
 344
 345         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 346                  mmc_hostname(host->mmc), (unsigned long)
 347                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 348                  host->mmc->f_max / 1000000);
 349
 350         return ret;
 351
 352 eirq:
 353         tmio_mmc_host_remove(host);
 354 eprobe:
 355 eclkget:
 356         if (p && p->cleanup)
 357                 p->cleanup(pdev);
 358         return ret;
 359 }
 360
 361 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 362 {
 363         struct mmc_host *mmc = platform_get_drvdata(pdev);
 364         struct tmio_mmc_host *host = mmc_priv(mmc);
 365         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 366
 367         tmio_mmc_host_remove(host);
 368
 369         if (p && p->cleanup)
 370                 p->cleanup(pdev);
 371
 372         return 0;
 373 }
 374
 375 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 376         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 377                         pm_runtime_force_resume)
 378         SET_PM_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
 379                         tmio_mmc_host_runtime_resume,
 380                         NULL)
 381 };
 382
 383 static struct platform_driver sh_mobile_sdhi_driver = {
 384         .driver         = {
 385                 .name   = "sh_mobile_sdhi",
 386                 .pm     = &tmio_mmc_dev_pm_ops,
 387                 .of_match_table = sh_mobile_sdhi_of_match,
 388         },
 389         .probe          = sh_mobile_sdhi_probe,
 390         .remove         = sh_mobile_sdhi_remove,
 391 };
 392
 393 module_platform_driver(sh_mobile_sdhi_driver);
 394
 395 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 396 MODULE_AUTHOR("Magnus Damm");
 397 MODULE_LICENSE("GPL v2");
 398 MODULE_ALIAS("platform:sh_mobile_sdhi");