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/clk.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/mmc/host.h>
  26 #include <linux/module.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         ret = readl(host->ioaddr + reg);
  55
  56         switch (reg) {
  57         case SDHCI_CAPABILITIES:
  58                 /* Mask the support for 3.0V */
  59                 ret &= ~SDHCI_CAN_VDD_300;
  60                 break;
  61         }
  62         return ret;
  63 }
  64
  65 static const struct sdhci_ops sdhci_dove_ops = {
  66         .read_w = sdhci_dove_readw,
  67         .read_l = sdhci_dove_readl,
  68         .set_clock = sdhci_set_clock,
  69         .set_bus_width = sdhci_set_bus_width,
  70         .reset = sdhci_reset,
  71         .set_uhs_signaling = sdhci_set_uhs_signaling,
  72 };
  73
  74 static const struct sdhci_pltfm_data sdhci_dove_pdata = {
  75         .ops    = &sdhci_dove_ops,
  76         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
  77                   SDHCI_QUIRK_NO_BUSY_IRQ |
  78                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  79                   SDHCI_QUIRK_FORCE_DMA |
  80                   SDHCI_QUIRK_NO_HISPD_BIT,
  81 };
  82
  83 static int sdhci_dove_probe(struct platform_device *pdev)
  84 {
  85         struct sdhci_host *host;
  86         struct sdhci_pltfm_host *pltfm_host;
  87         struct sdhci_dove_priv *priv;
  88         int ret;
  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                 return -ENOMEM;
  95         }
  96
  97         priv->clk = devm_clk_get(&pdev->dev, NULL);
  98
  99         host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
 100         if (IS_ERR(host))
 101                 return PTR_ERR(host);
 102
 103         pltfm_host = sdhci_priv(host);
 104         pltfm_host->priv = priv;
 105
 106         if (!IS_ERR(priv->clk))
 107                 clk_prepare_enable(priv->clk);
 108
 109         ret = mmc_of_parse(host->mmc);
 110         if (ret)
 111                 goto err_sdhci_add;
 112
 113         ret = sdhci_add_host(host);
 114         if (ret)
 115                 goto err_sdhci_add;
 116
 117         return 0;
 118
 119 err_sdhci_add:
 120         if (!IS_ERR(priv->clk))
 121                 clk_disable_unprepare(priv->clk);
 122         sdhci_pltfm_free(pdev);
 123         return ret;
 124 }
 125
 126 static int sdhci_dove_remove(struct platform_device *pdev)
 127 {
 128         struct sdhci_host *host = platform_get_drvdata(pdev);
 129         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 130         struct sdhci_dove_priv *priv = pltfm_host->priv;
 131
 132         sdhci_pltfm_unregister(pdev);
 133
 134         if (!IS_ERR(priv->clk))
 135                 clk_disable_unprepare(priv->clk);
 136
 137         return 0;
 138 }
 139
 140 static const struct of_device_id sdhci_dove_of_match_table[] = {
 141         { .compatible = "marvell,dove-sdhci", },
 142         {}
 143 };
 144 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
 145
 146 static struct platform_driver sdhci_dove_driver = {
 147         .driver         = {
 148                 .name   = "sdhci-dove",
 149                 .pm     = SDHCI_PLTFM_PMOPS,
 150                 .of_match_table = sdhci_dove_of_match_table,
 151         },
 152         .probe          = sdhci_dove_probe,
 153         .remove         = sdhci_dove_remove,
 154 };
 155
 156 module_platform_driver(sdhci_dove_driver);
 157
 158 MODULE_DESCRIPTION("SDHCI driver for Dove");
 159 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 160               "Mike Rapoport <mike@compulab.co.il>");
 161 MODULE_LICENSE("GPL v2");