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 #include <linux/of.h>
  28
  29 #include "sdhci-pltfm.h"
  30
  31 struct sdhci_dove_priv {
  32         struct clk *clk;
  33 };
  34
  35 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
  36 {
  37         u16 ret;
  38
  39         switch (reg) {
  40         case SDHCI_HOST_VERSION:
  41         case SDHCI_SLOT_INT_STATUS:
  42                 /* those registers don't exist */
  43                 return 0;
  44         default:
  45                 ret = readw(host->ioaddr + reg);
  46         }
  47         return ret;
  48 }
  49
  50 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
  51 {
  52         u32 ret;
  53
  54         switch (reg) {
  55         case SDHCI_CAPABILITIES:
  56                 ret = readl(host->ioaddr + reg);
  57                 /* Mask the support for 3.0V */
  58                 ret &= ~SDHCI_CAN_VDD_300;
  59                 break;
  60         default:
  61                 ret = readl(host->ioaddr + reg);
  62         }
  63         return ret;
  64 }
  65
  66 static struct sdhci_ops sdhci_dove_ops = {
  67         .read_w = sdhci_dove_readw,
  68         .read_l = sdhci_dove_readl,
  69 };
  70
  71 static struct sdhci_pltfm_data sdhci_dove_pdata = {
  72         .ops    = &sdhci_dove_ops,
  73         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
  74                   SDHCI_QUIRK_NO_BUSY_IRQ |
  75                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  76                   SDHCI_QUIRK_FORCE_DMA |
  77                   SDHCI_QUIRK_NO_HISPD_BIT,
  78 };
  79
  80 static int __devinit sdhci_dove_probe(struct platform_device *pdev)
  81 {
  82         struct sdhci_host *host;
  83         struct sdhci_pltfm_host *pltfm_host;
  84         struct sdhci_dove_priv *priv;
  85         int ret;
  86
  87         ret = sdhci_pltfm_register(pdev, &sdhci_dove_pdata);
  88         if (ret)
  89                 goto sdhci_dove_register_fail;
  90
  91         priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
  92                             GFP_KERNEL);
  93         if (!priv) {
  94                 dev_err(&pdev->dev, "unable to allocate private data");
  95                 ret = -ENOMEM;
  96                 goto sdhci_dove_allocate_fail;
  97         }
  98
  99         host = platform_get_drvdata(pdev);
 100         pltfm_host = sdhci_priv(host);
 101         pltfm_host->priv = priv;
 102
 103         priv->clk = clk_get(&pdev->dev, NULL);
 104         if (!IS_ERR(priv->clk))
 105                 clk_prepare_enable(priv->clk);
 106         return 0;
 107
 108 sdhci_dove_allocate_fail:
 109         sdhci_pltfm_unregister(pdev);
 110 sdhci_dove_register_fail:
 111         return ret;
 112 }
 113
 114 static int __devexit sdhci_dove_remove(struct platform_device *pdev)
 115 {
 116         struct sdhci_host *host = platform_get_drvdata(pdev);
 117         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 118         struct sdhci_dove_priv *priv = pltfm_host->priv;
 119
 120         if (priv->clk) {
 121                 if (!IS_ERR(priv->clk)) {
 122                         clk_disable_unprepare(priv->clk);
 123                         clk_put(priv->clk);
 124                 }
 125                 devm_kfree(&pdev->dev, priv->clk);
 126         }
 127         return sdhci_pltfm_unregister(pdev);
 128 }
 129
 130 static const struct of_device_id sdhci_dove_of_match_table[] __devinitdata = {
 131         { .compatible = "marvell,dove-sdhci", },
 132         {}
 133 };
 134 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
 135
 136 static struct platform_driver sdhci_dove_driver = {
 137         .driver         = {
 138                 .name   = "sdhci-dove",
 139                 .owner  = THIS_MODULE,
 140                 .pm     = SDHCI_PLTFM_PMOPS,
 141                 .of_match_table = of_match_ptr(sdhci_dove_of_match_table),
 142         },
 143         .probe          = sdhci_dove_probe,
 144         .remove         = __devexit_p(sdhci_dove_remove),
 145 };
 146
 147 module_platform_driver(sdhci_dove_driver);
 148
 149 MODULE_DESCRIPTION("SDHCI driver for Dove");
 150 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 151               "Mike Rapoport <mike@compulab.co.il>");
 152 MODULE_LICENSE("GPL v2");