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 sh_dmae_slave param_tx;
  50         struct sh_dmae_slave param_rx;
  51         struct tmio_mmc_dma dma_priv;
  52 };
  53
  54 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
  55 {
  56         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
  57         struct tmio_mmc_host *host = mmc_priv(mmc);
  58         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  59         int ret = clk_enable(priv->clk);
  60         if (ret < 0)
  61                 return ret;
  62
  63         *f = clk_get_rate(priv->clk);
  64         return 0;
  65 }
  66
  67 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
  68 {
  69         struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
  70         struct tmio_mmc_host *host = mmc_priv(mmc);
  71         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
  72         clk_disable(priv->clk);
  73 }
  74
  75 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  76 {
  77         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  78
  79         p->set_pwr(pdev, state);
  80 }
  81
  82 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  83 {
  84         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  85
  86         return p->get_cd(pdev);
  87 }
  88
  89 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
  90 {
  91         int timeout = 1000;
  92
  93         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
  94                 udelay(1);
  95
  96         if (!timeout) {
  97                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
  98                 return -EBUSY;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 105 {
 106         switch (addr)
 107         {
 108         case CTL_SD_CMD:
 109         case CTL_STOP_INTERNAL_ACTION:
 110         case CTL_XFER_BLK_COUNT:
 111         case CTL_SD_CARD_CLK_CTL:
 112         case CTL_SD_XFER_LEN:
 113         case CTL_SD_MEM_CARD_OPT:
 114         case CTL_TRANSACTION_CTL:
 115         case CTL_DMA_ENABLE:
 116                 return sh_mobile_sdhi_wait_idle(host);
 117         }
 118
 119         return 0;
 120 }
 121
 122 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
 123 {
 124         mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
 125 }
 126
 127 static const struct sh_mobile_sdhi_ops sdhi_ops = {
 128         .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
 129 };
 130
 131 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
 132         { .compatible = "renesas,shmobile-sdhi" },
 133         { .compatible = "renesas,sh7372-sdhi" },
 134         { .compatible = "renesas,r8a7740-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
 135         {},
 136 };
 137 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
 138
 139 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
 140 {
 141         const struct of_device_id *of_id =
 142                 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
 143         struct sh_mobile_sdhi *priv;
 144         struct tmio_mmc_data *mmc_data;
 145         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 146         struct tmio_mmc_host *host;
 147         int irq, ret, i = 0;
 148         bool multiplexed_isr = true;
 149
 150         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 151         if (priv == NULL) {
 152                 dev_err(&pdev->dev, "kzalloc failed\n");
 153                 return -ENOMEM;
 154         }
 155
 156         mmc_data = &priv->mmc_data;
 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                         priv->param_tx.shdma_slave.slave_id = p->dma_slave_tx;
 190                         priv->param_rx.shdma_slave.slave_id = p->dma_slave_rx;
 191                         priv->dma_priv.chan_priv_tx = &priv->param_tx.shdma_slave;
 192                         priv->dma_priv.chan_priv_rx = &priv->param_rx.shdma_slave;
 193                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 194                         mmc_data->dma = &priv->dma_priv;
 195                 }
 196         }
 197
 198         /*
 199          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 200          * bus width mode.
 201          */
 202         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 203
 204         /*
 205          * All SDHI blocks support SDIO IRQ signalling.
 206          */
 207         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 208
 209         if (of_id && of_id->data) {
 210                 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
 211                 mmc_data->flags |= of_data->tmio_flags;
 212         }
 213
 214         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 215         if (ret < 0)
 216                 goto eprobe;
 217
 218         /*
 219          * Allow one or more specific (named) ISRs or
 220          * one or more multiplexed (un-named) ISRs.
 221          */
 222
 223         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
 224         if (irq >= 0) {
 225                 multiplexed_isr = false;
 226                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
 227                                   dev_name(&pdev->dev), host);
 228                 if (ret)
 229                         goto eirq;
 230         }
 231
 232         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
 233         if (irq >= 0) {
 234                 multiplexed_isr = false;
 235                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
 236                                   dev_name(&pdev->dev), host);
 237                 if (ret)
 238                         goto eirq;
 239         }
 240
 241         irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
 242         if (irq >= 0) {
 243                 multiplexed_isr = false;
 244                 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
 245                                   dev_name(&pdev->dev), host);
 246                 if (ret)
 247                         goto eirq;
 248         } else if (!multiplexed_isr) {
 249                 dev_err(&pdev->dev,
 250                         "Principal SD-card IRQ is missing among named interrupts\n");
 251                 ret = irq;
 252                 goto eirq;
 253         }
 254
 255         if (multiplexed_isr) {
 256                 while (1) {
 257                         irq = platform_get_irq(pdev, i);
 258                         if (irq < 0)
 259                                 break;
 260                         i++;
 261                         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
 262                                           dev_name(&pdev->dev), host);
 263                         if (ret)
 264                                 goto eirq;
 265                 }
 266
 267                 /* There must be at least one IRQ source */
 268                 if (!i)
 269                         goto eirq;
 270         }
 271
 272         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 273                  mmc_hostname(host->mmc), (unsigned long)
 274                  (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
 275                  host->mmc->f_max / 1000000);
 276
 277         return ret;
 278
 279 eirq:
 280         tmio_mmc_host_remove(host);
 281 eprobe:
 282 eclkget:
 283         if (p && p->cleanup)
 284                 p->cleanup(pdev);
 285         return ret;
 286 }
 287
 288 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 289 {
 290         struct mmc_host *mmc = platform_get_drvdata(pdev);
 291         struct tmio_mmc_host *host = mmc_priv(mmc);
 292         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 293
 294         tmio_mmc_host_remove(host);
 295
 296         if (p && p->cleanup)
 297                 p->cleanup(pdev);
 298
 299         return 0;
 300 }
 301
 302 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 303         .suspend = tmio_mmc_host_suspend,
 304         .resume = tmio_mmc_host_resume,
 305         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 306         .runtime_resume = tmio_mmc_host_runtime_resume,
 307 };
 308
 309 static struct platform_driver sh_mobile_sdhi_driver = {
 310         .driver         = {
 311                 .name   = "sh_mobile_sdhi",
 312                 .owner  = THIS_MODULE,
 313                 .pm     = &tmio_mmc_dev_pm_ops,
 314                 .of_match_table = sh_mobile_sdhi_of_match,
 315         },
 316         .probe          = sh_mobile_sdhi_probe,
 317         .remove         = sh_mobile_sdhi_remove,
 318 };
 319
 320 module_platform_driver(sh_mobile_sdhi_driver);
 321
 322 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 323 MODULE_AUTHOR("Magnus Damm");
 324 MODULE_LICENSE("GPL v2");
 325 MODULE_ALIAS("platform:sh_mobile_sdhi");