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/platform_device.h>
  25 #include <linux/mmc/host.h>
  26 #include <linux/mmc/sh_mobile_sdhi.h>
  27 #include <linux/mfd/tmio.h>
  28 #include <linux/sh_dma.h>
  29
  30 #include "tmio_mmc.h"
  31
  32 struct sh_mobile_sdhi {
  33         struct clk *clk;
  34         struct tmio_mmc_data mmc_data;
  35         struct sh_dmae_slave param_tx;
  36         struct sh_dmae_slave param_rx;
  37         struct tmio_mmc_dma dma_priv;
  38 };
  39
  40 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
  41 {
  42         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  43
  44         if (p && p->set_pwr)
  45                 p->set_pwr(pdev, state);
  46 }
  47
  48 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
  49 {
  50         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  51
  52         if (p && p->get_cd)
  53                 return p->get_cd(pdev);
  54         else
  55                 return -ENOSYS;
  56 }
  57
  58 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
  59 {
  60         struct sh_mobile_sdhi *priv;
  61         struct tmio_mmc_data *mmc_data;
  62         struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
  63         struct tmio_mmc_host *host;
  64         char clk_name[8];
  65         int ret;
  66
  67         priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
  68         if (priv == NULL) {
  69                 dev_err(&pdev->dev, "kzalloc failed\n");
  70                 return -ENOMEM;
  71         }
  72
  73         mmc_data = &priv->mmc_data;
  74
  75         snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
  76         priv->clk = clk_get(&pdev->dev, clk_name);
  77         if (IS_ERR(priv->clk)) {
  78                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
  79                 ret = PTR_ERR(priv->clk);
  80                 goto eclkget;
  81         }
  82
  83         clk_enable(priv->clk);
  84
  85         mmc_data->hclk = clk_get_rate(priv->clk);
  86         mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
  87         mmc_data->get_cd = sh_mobile_sdhi_get_cd;
  88         mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
  89         if (p) {
  90                 mmc_data->flags = p->tmio_flags;
  91                 mmc_data->ocr_mask = p->tmio_ocr_mask;
  92                 mmc_data->capabilities |= p->tmio_caps;
  93
  94                 if (p->dma_slave_tx >= 0 && p->dma_slave_rx >= 0) {
  95                         priv->param_tx.slave_id = p->dma_slave_tx;
  96                         priv->param_rx.slave_id = p->dma_slave_rx;
  97                         priv->dma_priv.chan_priv_tx = &priv->param_tx;
  98                         priv->dma_priv.chan_priv_rx = &priv->param_rx;
  99                         priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
 100                         mmc_data->dma = &priv->dma_priv;
 101                 }
 102         }
 103
 104         /*
 105          * All SDHI blocks support 2-byte and larger block sizes in 4-bit
 106          * bus width mode.
 107          */
 108         mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
 109
 110         /*
 111          * All SDHI blocks support SDIO IRQ signalling.
 112          */
 113         mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
 114
 115         ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
 116         if (ret < 0)
 117                 goto eprobe;
 118
 119         pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
 120                 (unsigned long)host->ctl, host->irq);
 121
 122         return ret;
 123
 124 eprobe:
 125         clk_disable(priv->clk);
 126         clk_put(priv->clk);
 127 eclkget:
 128         kfree(priv);
 129         return ret;
 130 }
 131
 132 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
 133 {
 134         struct mmc_host *mmc = platform_get_drvdata(pdev);
 135         struct tmio_mmc_host *host = mmc_priv(mmc);
 136         struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
 137
 138         tmio_mmc_host_remove(host);
 139         clk_disable(priv->clk);
 140         clk_put(priv->clk);
 141         kfree(priv);
 142
 143         return 0;
 144 }
 145
 146 static struct platform_driver sh_mobile_sdhi_driver = {
 147         .driver         = {
 148                 .name   = "sh_mobile_sdhi",
 149                 .owner  = THIS_MODULE,
 150         },
 151         .probe          = sh_mobile_sdhi_probe,
 152         .remove         = __devexit_p(sh_mobile_sdhi_remove),
 153 };
 154
 155 static int __init sh_mobile_sdhi_init(void)
 156 {
 157         return platform_driver_register(&sh_mobile_sdhi_driver);
 158 }
 159
 160 static void __exit sh_mobile_sdhi_exit(void)
 161 {
 162         platform_driver_unregister(&sh_mobile_sdhi_driver);
 163 }
 164
 165 module_init(sh_mobile_sdhi_init);
 166 module_exit(sh_mobile_sdhi_exit);
 167
 168 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
 169 MODULE_AUTHOR("Magnus Damm");
 170 MODULE_LICENSE("GPL v2");
 171 MODULE_ALIAS("platform:sh_mobile_sdhi");