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 struct sh_mobile_sdhi_of_data {
  37         unsigned long tmio_flags;
  38 };
  39
  40 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
  41         {
  42                 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
  43         },
  44 };
  45
  46 struct sh_mobile_sdhi {
  47         struct clk *clk;
  48         struct tmio_mmc_data mmc_data;
  49         struct tmio_mmc_dma dma_priv;
  50 };
  51
  52 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
  53 {
  54         struct mmc_host *mmc = platform_get_drvdata(pdev);
  55         struct tmio_mmc_host *host = mmc_priv(mmc);
  56         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  57         int ret = clk_enable(priv->clk);
  58         if (ret < 0)
  59                 return ret;
  60
  61         *f = clk_get_rate(priv->clk);
  62         return 0;
  63 }
  64
  65 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
  66 {
  67         struct mmc_host *mmc = platform_get_drvdata(pdev);
  68         struct tmio_mmc_host *host = mmc_priv(mmc);
  69         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  70         clk_disable(priv->clk);
  71 }
  72
  73 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  74 {
  75         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  76
  77         p->set_pwr(pdev, state);
  78 }
  79
  80 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  81 {
  82         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  83
  84         return p->get_cd(pdev);
  85 }
  86
  87 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
  88 {
  89         int timeout = 1000;
  90
  91         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
  92                 udelay(1);
  93
  94         if (!timeout) {
  95                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
  96                 return -EBUSY;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 103 {
 104         switch (addr)
 105         {
 106         case CTL_SD_CMD:
 107         case CTL_STOP_INTERNAL_ACTION:
 108         case CTL_XFER_BLK_COUNT:
 109         case CTL_SD_CARD_CLK_CTL:
 110         case CTL_SD_XFER_LEN:
 111         case CTL_SD_MEM_CARD_OPT:
 112         case CTL_TRANSACTION_CTL:
 113         case CTL_DMA_ENABLE:
 114                 return sh_mobile_sdhi_wait_idle(host);
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
 121 {
 122         mmc_detect_change(platform_get_drvdata(pdev), msecs_to_jiffies(100));
 123 }
 124
 125 static const struct sh_mobile_sdhi_ops sdhi_ops = {
 126         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
 127 };
 128
 129 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 130         { .compatible = "renesas,shmobile-sdhi" },
 131         { .compatible = "renesas,sh7372-sdhi" },
 132         { .compatible = "renesas,r8a7740-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
 133         {},
 134 };
 135 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 136
 137 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
 138 {
 139         const struct of_device_id *of_id =
 140                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
 141         struct sh_mobile_sdhi *priv;
 142         struct tmio_mmc_data *mmc_data;
 143         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 144         struct tmio_mmc_host *host;
 145         int irq, ret, i = 0;
 146         bool multiplexed_isr = true;
 147         struct tmio_mmc_dma *dma_priv;
 148
 149         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 150         if (priv == NULL) {
 151                 dev_err(&pdev->dev, "kzalloc failed\n");
 152                 return -ENOMEM;
 153         }
 154
 155         mmc_data = &priv->mmc_data;
 156         dma_priv = &priv->dma_priv;
 157
 158         if (p) {
 159                 if (p->init) {
 160                         ret = p->init(pdev, &sdhi_ops);
 161                         if (ret)
 162                                 return ret;
 163                 }
 164         }
 165
 166         priv->clk = devm_clk_get(&pdev->dev, NULL);
 167         if (IS_ERR(priv->clk)) {
 168                 ret = PTR_ERR(priv->clk);
 169                 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
 170                 goto eclkget;
 171         }
 172
 173         mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
 174         mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
 175         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 176         mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 177         if (p) {
 178                 mmc_data->flags = p->tmio_flags;
 179                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 180                 mmc_data->capabilities |= p->tmio_caps;
 181                 mmc_data->capabilities2 |= p->tmio_caps2;
 182                 mmc_data->cd_gpio = p->cd_gpio;
 183                 if (p->set_pwr)
 184                         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 185                 if (p->get_cd)
 186                         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 187
 188                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 189                         /*
 190                          * Yes, we have to provide slave IDs twice to TMIO:
 191                          * once as a filter parameter and once for channel
 192                          * configuration as an explicit slave ID
 193                          */
 194                         dma_priv->chan_priv_tx = (void *)p->dma_slave_tx;
 195                         dma_priv->chan_priv_rx = (void *)p->dma_slave_rx;
 196                         dma_priv->slave_id_tx = p->dma_slave_tx;
 197                         dma_priv->slave_id_rx = p->dma_slave_rx;
 198                 }
 199         }
 200
 201         dma_priv->alignment_shift = 1; /* 2-byte alignment */
 202         dma_priv->filter = shdma_chan_filter;
 203
 204         mmc_data->dma = dma_priv;
 205
 206         /*
 207          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 208          * bus width mode.
 209          */
 210         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 211
 212         /*
 213          * All SDHI blocks support SDIO IRQ signalling.
 214          */
 215         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 216
 217         if (of_id && of_id->data) {
 218                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
 219                 mmc_data->flags |= of_data->tmio_flags;
 220         }
 221
 222         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 223         if (ret < 0)
 224                 goto eprobe;
 225
 226         /*
 227          * Allow one or more specific (named) ISRs or
 228          * one or more multiplexed (un-named) ISRs.
 229          */
 230
 231         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 232         if (irq >= 0) {
 233                 multiplexed_isr = false;
 234                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
 235                                   dev_name(&pdev->dev), host);
 236                 if (ret)
 237                         goto eirq;
 238         }
 239
 240         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 241         if (irq >= 0) {
 242                 multiplexed_isr = false;
 243                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
 244                                   dev_name(&pdev->dev), host);
 245                 if (ret)
 246                         goto eirq;
 247         }
 248
 249         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 250         if (irq >= 0) {
 251                 multiplexed_isr = false;
 252                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
 253                                   dev_name(&pdev->dev), host);
 254                 if (ret)
 255                         goto eirq;
 256         } else if (!multiplexed_isr) {
 257                 dev_err(&pdev->dev,
 258                         "Principal SD-card IRQ is missing among named interrupts\n");
 259                 ret = irq;
 260                 goto eirq;
 261         }
 262
 263         if (multiplexed_isr) {
 264                 while (1) {
 265                         irq = platform_get_irq(pdev, i);
 266                         if (irq < 0)
 267                                 break;
 268                         i++;
 269                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
 270                                           dev_name(&pdev->dev), host);
 271                         if (ret)
 272                                 goto eirq;
 273                 }
 274
 275                 /* There must be at least one IRQ source */
 276                 if (!i) {
 277                         ret = irq;
 278                         goto eirq;
 279                 }
 280         }
 281
 282         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 283                  mmc_hostname(host->mmc), (unsigned long)
 284                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 285                  host->mmc->f_max / 1000000);
 286
 287         return ret;
 288
 289 eirq:
 290         tmio_mmc_host_remove(host);
 291 eprobe:
 292 eclkget:
 293         if (p && p->cleanup)
 294                 p->cleanup(pdev);
 295         return ret;
 296 }
 297
 298 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 299 {
 300         struct mmc_host *mmc = platform_get_drvdata(pdev);
 301         struct tmio_mmc_host *host = mmc_priv(mmc);
 302         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 303
 304         tmio_mmc_host_remove(host);
 305
 306         if (p && p->cleanup)
 307                 p->cleanup(pdev);
 308
 309         return 0;
 310 }
 311
 312 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 313         .suspend = tmio_mmc_host_suspend,
 314         .resume = tmio_mmc_host_resume,
 315         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 316         .runtime_resume = tmio_mmc_host_runtime_resume,
 317 };
 318
 319 static struct platform_driver sh_mobile_sdhi_driver = {
 320         .driver         = {
 321                 .name   = "sh_mobile_sdhi",
 322                 .owner  = THIS_MODULE,
 323                 .pm     = &tmio_mmc_dev_pm_ops,
 324                 .of_match_table = sh_mobile_sdhi_of_match,
 325         },
 326         .probe          = sh_mobile_sdhi_probe,
 327         .remove         = sh_mobile_sdhi_remove,
 328 };
 329
 330 module_platform_driver(sh_mobile_sdhi_driver);
 331
 332 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 333 MODULE_AUTHOR("Magnus Damm");
 334 MODULE_LICENSE("GPL v2");
 335 MODULE_ALIAS("platform:sh_mobile_sdhi");