drivers/mmc/host/sdhci-dove.c

   1 /*
   2  * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
   3  *
   4  * Author: Saeed Bishara <saeed@marvell.com>
   5  *         Mike Rapoport <mike@compulab.co.il>
   6  * Based on sdhci-cns3xxx.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/io.h>
  23 #include <linux/clk.h>
  24 #include <linux/err.h>
  25 #include <linux/module.h>
  26 #include <linux/mmc/host.h>
  27
  28 #include "sdhci-pltfm.h"
  29
  30 struct sdhci_dove_priv {
  31         struct clk *clk;
  32 };
  33
  34 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
  35 {
  36         u16 ret;
  37
  38         switch (reg) {
  39         case SDHCI_HOST_VERSION:
  40         case SDHCI_SLOT_INT_STATUS:
  41                 /* those registers don't exist */
  42                 return 0;
  43         default:
  44                 ret = readw(host->ioaddr + reg);
  45         }
  46         return ret;
  47 }
  48
  49 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
  50 {
  51         u32 ret;
  52
  53         switch (reg) {
  54         case SDHCI_CAPABILITIES:
  55                 ret = readl(host->ioaddr + reg);
  56                 /* Mask the support for 3.0V */
  57                 ret &= ~SDHCI_CAN_VDD_300;
  58                 break;
  59         default:
  60                 ret = readl(host->ioaddr + reg);
  61         }
  62         return ret;
  63 }
  64
  65 static struct sdhci_ops sdhci_dove_ops = {
  66         .read_w = sdhci_dove_readw,
  67         .read_l = sdhci_dove_readl,
  68 };
  69
  70 static struct sdhci_pltfm_data sdhci_dove_pdata = {
  71         .ops    = &sdhci_dove_ops,
  72         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
  73                   SDHCI_QUIRK_NO_BUSY_IRQ |
  74                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  75                   SDHCI_QUIRK_FORCE_DMA |
  76                   SDHCI_QUIRK_NO_HISPD_BIT,
  77 };
  78
  79 static int __devinit sdhci_dove_probe(struct platform_device *pdev)
  80 {
  81         struct sdhci_host *host;
  82         struct sdhci_pltfm_host *pltfm_host;
  83         struct sdhci_dove_priv *priv;
  84         int ret;
  85
  86         ret = sdhci_pltfm_register(pdev, &sdhci_dove_pdata);
  87         if (ret)
  88                 goto sdhci_dove_register_fail;
  89
  90         priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
  91                             GFP_KERNEL);
  92         if (!priv) {
  93                 dev_err(&pdev->dev, "unable to allocate private data");
  94                 ret = -ENOMEM;
  95                 goto sdhci_dove_allocate_fail;
  96         }
  97
  98         host = platform_get_drvdata(pdev);
  99         pltfm_host = sdhci_priv(host);
 100         pltfm_host->priv = priv;
 101
 102         priv->clk = clk_get(&pdev->dev, NULL);
 103         if (!IS_ERR(priv->clk))
 104                 clk_prepare_enable(priv->clk);
 105         return 0;
 106
 107 sdhci_dove_allocate_fail:
 108         sdhci_pltfm_unregister(pdev);
 109 sdhci_dove_register_fail:
 110         return ret;
 111 }
 112
 113 static int __devexit sdhci_dove_remove(struct platform_device *pdev)
 114 {
 115         struct sdhci_host *host = platform_get_drvdata(pdev);
 116         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 117         struct sdhci_dove_priv *priv = pltfm_host->priv;
 118
 119         if (priv->clk) {
 120                 if (!IS_ERR(priv->clk)) {
 121                         clk_disable_unprepare(priv->clk);
 122                         clk_put(priv->clk);
 123                 }
 124                 devm_kfree(&pdev->dev, priv->clk);
 125         }
 126         return sdhci_pltfm_unregister(pdev);
 127 }
 128
 129 static struct platform_driver sdhci_dove_driver = {
 130         .driver         = {
 131                 .name   = "sdhci-dove",
 132                 .owner  = THIS_MODULE,
 133                 .pm     = SDHCI_PLTFM_PMOPS,
 134         },
 135         .probe          = sdhci_dove_probe,
 136         .remove         = __devexit_p(sdhci_dove_remove),
 137 };
 138
 139 module_platform_driver(sdhci_dove_driver);
 140
 141 MODULE_DESCRIPTION("SDHCI driver for Dove");
 142 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 143               "Mike Rapoport <mike@compulab.co.il>");
 144 MODULE_LICENSE("GPL v2");