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/module.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/mmc/host.h>
  27 #include <linux/mmc/sh_mobile_sdhi.h>
  28 #include <linux/mfd/tmio.h>
  29 #include <linux/sh_dma.h>
  30 #include <linux/delay.h>
  31
  32 #include "tmio_mmc.h"
  33
  34 struct sh_mobile_sdhi {
  35         struct clk *clk;
  36         struct tmio_mmc_data mmc_data;
  37         struct sh_dmae_slave param_tx;
  38         struct sh_dmae_slave param_rx;
  39         struct tmio_mmc_dma dma_priv;
  40 };
  41
  42 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  43 {
  44         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  45
  46         if (p && p->set_pwr)
  47                 p->set_pwr(pdev, state);
  48 }
  49
  50 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  51 {
  52         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  53
  54         if (p && p->get_cd)
  55                 return p->get_cd(pdev);
  56         else
  57                 return -ENOSYS;
  58 }
  59
  60 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
  61 {
  62         int timeout = 1000;
  63
  64         while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
  65                 udelay(1);
  66
  67         if (!timeout) {
  68                 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
  69                 return -EBUSY;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
  76 {
  77         switch (addr)
  78         {
  79         case CTL_SD_CMD:
  80         case CTL_STOP_INTERNAL_ACTION:
  81         case CTL_XFER_BLK_COUNT:
  82         case CTL_SD_CARD_CLK_CTL:
  83         case CTL_SD_XFER_LEN:
  84         case CTL_SD_MEM_CARD_OPT:
  85         case CTL_TRANSACTION_CTL:
  86         case CTL_DMA_ENABLE:
  87                 return sh_mobile_sdhi_wait_idle(host);
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
  94 {
  95         struct sh_mobile_sdhi *priv;
  96         struct tmio_mmc_data *mmc_data;
  97         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  98         struct tmio_mmc_host *host;
  99         char clk_name[8];
 100         int i, irq, ret;
 101
 102         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
 103         if (priv == NULL) {
 104                 dev_err(&pdev->dev, "kzalloc failed\n");
 105                 return -ENOMEM;
 106         }
 107
 108         mmc_data = &priv->mmc_data;
 109         p->pdata = mmc_data;
 110
 111         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 112         priv->clk = clk_get(&pdev->dev, clk_name);
 113         if (IS_ERR(priv->clk)) {
 114                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 115                 ret = PTR_ERR(priv->clk);
 116                 goto eclkget;
 117         }
 118
 119         clk_enable(priv->clk);
 120
 121         mmc_data->hclk = clk_get_rate(priv->clk);
 122         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
 123         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 124         if (mmc_data->flags & TMIO_MMC_HAS_IDLE_WAIT)
 125                 mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
 126         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 127         if (p) {
 128                 mmc_data->flags = p->tmio_flags;
 129                 mmc_data->ocr_mask = p->tmio_ocr_mask;
 130                 mmc_data->capabilities |= p->tmio_caps;
 131
 132                 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
 133                         priv->param_tx.slave_id = p->dma_slave_tx;
 134                         priv->param_rx.slave_id = p->dma_slave_rx;
 135                         priv->dma_priv.chan_priv_tx = &priv->param_tx;
 136                         priv->dma_priv.chan_priv_rx = &priv->param_rx;
 137                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 138                         mmc_data->dma = &priv->dma_priv;
 139                 }
 140         }
 141
 142         /*
 143          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 144          * bus width mode.
 145          */
 146         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 147
 148         /*
 149          * All SDHI blocks support SDIO IRQ signalling.
 150          */
 151         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 152
 153         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 154         if (ret < 0)
 155                 goto eprobe;
 156
 157         for (i = 0; i < 3; i++) {
 158                 irq = platform_get_irq(pdev, i);
 159                 if (irq < 0) {
 160                         if (i) {
 161                                 continue;
 162                         } else {
 163                                 ret = irq;
 164                                 goto eirq;
 165                         }
 166                 }
 167                 ret = request_irq(irq, tmio_mmc_irq, 0,
 168                                   dev_name(&pdev->dev), host);
 169                 if (ret) {
 170                         while (i--) {
 171                                 irq = platform_get_irq(pdev, i);
 172                                 if (irq >= 0)
 173                                         free_irq(irq, host);
 174                         }
 175                         goto eirq;
 176                 }
 177         }
 178         dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
 179                  mmc_hostname(host->mmc), (unsigned long)
 180                  (platform_get_resource(pdev,IORESOURCE_MEM, 0)->start),
 181                  mmc_data->hclk / 1000000);
 182
 183         return ret;
 184
 185 eirq:
 186         tmio_mmc_host_remove(host);
 187 eprobe:
 188         clk_disable(priv->clk);
 189         clk_put(priv->clk);
 190 eclkget:
 191         kfree(priv);
 192         return ret;
 193 }
 194
 195 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 196 {
 197         struct mmc_host *mmc = platform_get_drvdata(pdev);
 198         struct tmio_mmc_host *host = mmc_priv(mmc);
 199         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 200         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
 201         int i, irq;
 202
 203         p->pdata = NULL;
 204
 205         tmio_mmc_host_remove(host);
 206
 207         for (i = 0; i < 3; i++) {
 208                 irq = platform_get_irq(pdev, i);
 209                 if (irq >= 0)
 210                         free_irq(irq, host);
 211         }
 212
 213         clk_disable(priv->clk);
 214         clk_put(priv->clk);
 215         kfree(priv);
 216
 217         return 0;
 218 }
 219
 220 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 221         .suspend = tmio_mmc_host_suspend,
 222         .resume = tmio_mmc_host_resume,
 223         .runtime_suspend = tmio_mmc_host_runtime_suspend,
 224         .runtime_resume = tmio_mmc_host_runtime_resume,
 225 };
 226
 227 static struct platform_driver sh_mobile_sdhi_driver = {
 228         .driver         = {
 229                 .name   = "sh_mobile_sdhi",
 230                 .owner  = THIS_MODULE,
 231                 .pm     = &tmio_mmc_dev_pm_ops,
 232         },
 233         .probe          = sh_mobile_sdhi_probe,
 234         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 235 };
 236
 237 static int __init sh_mobile_sdhi_init(void)
 238 {
 239         return platform_driver_register(&sh_mobile_sdhi_driver);
 240 }
 241
 242 static void __exit sh_mobile_sdhi_exit(void)
 243 {
 244         platform_driver_unregister(&sh_mobile_sdhi_driver);
 245 }
 246
 247 module_init(sh_mobile_sdhi_init);
 248 module_exit(sh_mobile_sdhi_exit);
 249
 250 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 251 MODULE_AUTHOR("Magnus Damm");
 252 MODULE_LICENSE("GPL v2");
 253 MODULE_ALIAS("platform:sh_mobile_sdhi");