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