kernel/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 #define host_to_priv(host) container_of((host)->pdata, struct sh_mobile_sdhi, mmc_data)
  39
  40 struct sh_mobile_sdhi_of_data {
  41         unsigned long tmio_flags;
  42         unsigned long capabilities;
  43         unsigned long capabilities2;
  44         enum dma_slave_buswidth dma_buswidth;
  45         dma_addr_t dma_rx_offset;
  46 };
  47
  48 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
  49         {
  50                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
  51         },
  52 };
  53
  54 static const struct sh_mobile_sdhi_of_data of_rcar_gen1_compatible = {
  55         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
  56                           TMIO_MMC_CLK_ACTUAL,
  57         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
  58 };
  59
  60 static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
  61         .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
  62                           TMIO_MMC_CLK_ACTUAL,
  63         .capabilities   = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
  64         .dma_buswidth   = DMA_SLAVE_BUSWIDTH_4_BYTES,
  65         .dma_rx_offset  = 0x2000,
  66 };
  67
  68 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
  69         { .compatible = "renesas,sdhi-shmobile" },
  70         { .compatible = "renesas,sdhi-sh7372" },
  71         { .compatible = "renesas,sdhi-sh73a0", .data = &sh_mobile_sdhi_of_cfg[0], },
  72         { .compatible = "renesas,sdhi-r8a73a4", .data = &sh_mobile_sdhi_of_cfg[0], },
  73         { .compatible = "renesas,sdhi-r8a7740", .data = &sh_mobile_sdhi_of_cfg[0], },
  74         { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
  75         { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
  76         { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
  77         { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
  78         { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
  79         { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
  80         { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
  81         {},
  82 };
  83 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
  84
  85 struct sh_mobile_sdhi {
  86         struct clk *clk;
  87         struct tmio_mmc_data mmc_data;
  88         struct tmio_mmc_dma dma_priv;
  89 };
  90
  91 static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
  92 {
  93         u32 val;
  94
  95         /*
  96          * see also
  97          *      sh_mobile_sdhi_of_data :: dma_buswidth
  98          */
  99         switch (sd_ctrl_read16(host, CTL_VERSION)) {
 100         case 0x490C:
 101                 val = (width == 32) ? 0x0001 : 0x0000;
 102                 break;
 103         case 0xCB0D:
 104                 val = (width == 32) ? 0x0000 : 0x0001;
 105                 break;
 106         default:
 107                 /* nothing to do */
 108                 return;
 109         }
 110
 111         sd_ctrl_write16(host, EXT_ACC, val);
 112 }
 113
 114 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
 115 {
 116         struct mmc_host *mmc = platform_get_drvdata(pdev);
 117         struct tmio_mmc_host *host = mmc_priv(mmc);
 118         struct sh_mobile_sdhi *priv = host_to_priv(host);
 119         int ret = clk_prepare_enable(priv->clk);
 120         if (ret < 0)
 121                 return ret;
 122
 123         *f = clk_get_rate(priv->clk);
 124
 125         /* enable 16bit data access on SDBUF as default */
 126         sh_mobile_sdhi_sdbuf_width(host, 16);
 127
 128         return 0;
 129 }
 130
 131 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
 132 {
 133         struct mmc_host *mmc = platform_get_drvdata(pdev);
 134         struct tmio_mmc_host *host = mmc_priv(mmc);
 135         struct sh_mobile_sdhi *priv = host_to_priv(host);
 136         clk_disable_unprepare(priv->clk);
 137 }
 138
 139 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
 140 {
 141         int timeout = 1000;
 142
 143         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
 144                 udelay(1);
 145
 146         if (!timeout) {
 147                 dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
 148                 return -EBUSY;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 155 {
 156         switch (addr)
 157         {
 158         case CTL_SD_CMD:
 159         case CTL_STOP_INTERNAL_ACTION:
 160         case CTL_XFER_BLK_COUNT:
 161         case CTL_SD_CARD_CLK_CTL:
 162         case CTL_SD_XFER_LEN:
 163         case CTL_SD_MEM_CARD_OPT:
 164         case CTL_TRANSACTION_CTL:
 165         case CTL_DMA_ENABLE:
 166                 return sh_mobile_sdhi_wait_idle(host);
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card,
 173                                          unsigned int direction, int blk_size)
 174 {
 175         /*
 176          * In Renesas controllers, when performing a
 177          * multiple block read of one or two blocks,
 178          * depending on the timing with which the
 179          * response register is read, the response
 180          * value may not be read properly.
 181          * Use single block read for this HW bug
 182          */
 183         if ((direction == MMC_DATA_READ) &&
 184             blk_size == 2)
 185                 return 1;
 186
 187         return blk_size;
 188 }
 189
 190 static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
 191 {
 192         sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0);
 193
 194         /* enable 32bit access if DMA mode if possibile */
 195         sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16);
 196 }
 197
 198 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
 199 {
 200         const struct of_device_id *of_id =
 201                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
 202         struct sh_mobile_sdhi *priv;
 203         struct tmio_mmc_data *mmc_data;
 204         struct tmio_mmc_data *mmd = pdev->dev.platform_data;
 205         struct tmio_mmc_host *host;
 206         struct resource *res;
 207         int irq, ret, i = 0;
 208         bool multiplexed_isr = true;
 209         struct tmio_mmc_dma *dma_priv;
 210
 211         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 212         if (!res)
 213                 return -EINVAL;
 214
 215         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 216         if (priv == NULL) {
 217                 dev_err(&pdev->dev, "kzalloc failed\n");
 218                 return -ENOMEM;
 219         }
 220
 221         mmc_data = &priv->mmc_data;
 222         dma_priv = &priv->dma_priv;
 223
 224         priv->clk = devm_clk_get(&pdev->dev, NULL);
 225         if (IS_ERR(priv->clk)) {
 226                 ret = PTR_ERR(priv->clk);
 227                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
 228                 goto eprobe;
 229         }
 230
 231         host = tmio_mmc_host_alloc(pdev);
 232         if (!host) {
 233                 ret = -ENOMEM;
 234                 goto eprobe;
 235         }
 236
 237         host->dma               = dma_priv;
 238         host->write16_hook      = sh_mobile_sdhi_write16_hook;
 239         host->clk_enable        = sh_mobile_sdhi_clk_enable;
 240         host->clk_disable       = sh_mobile_sdhi_clk_disable;
 241         host->multi_io_quirk    = sh_mobile_sdhi_multi_io_quirk;
 242         /* SD control register space size is 0x100, 0x200 for bus_shift=1 */
 243         if (resource_size(res) > 0x100)
 244                 host->bus_shift = 1;
 245         else
 246                 host->bus_shift = 0;
 247
 248         if (mmd)
 249                 *mmc_data = *mmd;
 250
 251         dma_priv->filter = shdma_chan_filter;
 252         dma_priv->enable = sh_mobile_sdhi_enable_dma;
 253
 254         mmc_data->alignment_shift = 1; /* 2-byte alignment */
 255         mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
 256
 257         /*
 258          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 259          * bus width mode.
 260          */
 261         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 262
 263         /*
 264          * All SDHI blocks support SDIO IRQ signalling.
 265          */
 266         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 267
 268         /*
 269          * All SDHI have CMD12 controll bit
 270          */
 271         mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
 272
 273         /*
 274          * All SDHI need SDIO_INFO1 reserved bit
 275          */
 276         mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
 277
 278         if (of_id && of_id->data) {
 279                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
 280                 mmc_data->flags |= of_data->tmio_flags;
 281                 mmc_data->capabilities |= of_data->capabilities;
 282                 mmc_data->capabilities2 |= of_data->capabilities2;
 283                 mmc_data->dma_rx_offset = of_data->dma_rx_offset;
 284                 dma_priv->dma_buswidth = of_data->dma_buswidth;
 285         }
 286
 287         ret = tmio_mmc_host_probe(host, mmc_data);
 288         if (ret < 0)
 289                 goto efree;
 290
 291         /*
 292          * Allow one or more specific (named) ISRs or
 293          * one or more multiplexed (un-named) ISRs.
 294          */
 295
 296         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 297         if (irq >= 0) {
 298                 multiplexed_isr = false;
 299                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
 300                                   dev_name(&pdev->dev), host);
 301                 if (ret)
 302                         goto eirq;
 303         }
 304
 305         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 306         if (irq >= 0) {
 307                 multiplexed_isr = false;
 308                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
 309                                   dev_name(&pdev->dev), host);
 310                 if (ret)
 311                         goto eirq;
 312         }
 313
 314         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 315         if (irq >= 0) {
 316                 multiplexed_isr = false;
 317                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
 318                                   dev_name(&pdev->dev), host);
 319                 if (ret)
 320                         goto eirq;
 321         } else if (!multiplexed_isr) {
 322                 dev_err(&pdev->dev,
 323                         "Principal SD-card IRQ is missing among named interrupts\n");
 324                 ret = irq;
 325                 goto eirq;
 326         }
 327
 328         if (multiplexed_isr) {
 329                 while (1) {
 330                         irq = platform_get_irq(pdev, i);
 331                         if (irq < 0)
 332                                 break;
 333                         i++;
 334                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
 335                                           dev_name(&pdev->dev), host);
 336                         if (ret)
 337                                 goto eirq;
 338                 }
 339
 340                 /* There must be at least one IRQ source */
 341                 if (!i) {
 342                         ret = irq;
 343                         goto eirq;
 344                 }
 345         }
 346
 347         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 348                  mmc_hostname(host->mmc), (unsigned long)
 349                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 350                  host->mmc->f_max / 1000000);
 351
 352         return ret;
 353
 354 eirq:
 355         tmio_mmc_host_remove(host);
 356 efree:
 357         tmio_mmc_host_free(host);
 358 eprobe:
 359         return ret;
 360 }
 361
 362 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 363 {
 364         struct mmc_host *mmc = platform_get_drvdata(pdev);
 365         struct tmio_mmc_host *host = mmc_priv(mmc);
 366
 367         tmio_mmc_host_remove(host);
 368
 369         return 0;
 370 }
 371
 372 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 373         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 374                         pm_runtime_force_resume)
 375         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
 376                         tmio_mmc_host_runtime_resume,
 377                         NULL)
 378 };
 379
 380 static struct platform_driver sh_mobile_sdhi_driver = {
 381         .driver         = {
 382                 .name   = "sh_mobile_sdhi",
 383                 .pm     = &tmio_mmc_dev_pm_ops,
 384                 .of_match_table = sh_mobile_sdhi_of_match,
 385         },
 386         .probe          = sh_mobile_sdhi_probe,
 387         .remove         = sh_mobile_sdhi_remove,
 388 };
 389
 390 module_platform_driver(sh_mobile_sdhi_driver);
 391
 392 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 393 MODULE_AUTHOR("Magnus Damm");
 394 MODULE_LICENSE("GPL v2");
 395 MODULE_ALIAS("platform:sh_mobile_sdhi");