sdhci-dove.c

Go to the documentation of this file.

/*
 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
 *
 * Author: Saeed Bishara <[email protected]>
 *     Mike Rapoport <[email protected]>
 * Based on sdhci-cns3xxx.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/mmc/host.h>
#include <linux/of.h>

#include "sdhci-pltfm.h"

struct sdhci_dove_priv {
    struct clk *clk;
};

static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
{
    u16 ret;

    switch (reg) {
    case SDHCI_HOST_VERSION:
    case SDHCI_SLOT_INT_STATUS:
        /* those registers don't exist */
        return 0;
    default:
        ret = readw(host->ioaddr + reg);
    }
    return ret;
}

static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
{
    u32 ret;

    switch (reg) {
    case SDHCI_CAPABILITIES:
        ret = readl(host->ioaddr + reg);
        /* Mask the support for 3.0V */
        ret &= ~SDHCI_CAN_VDD_300;
        break;
    default:
        ret = readl(host->ioaddr + reg);
    }
    return ret;
}

static struct sdhci_ops sdhci_dove_ops = {
    .read_w = sdhci_dove_readw,
    .read_l = sdhci_dove_readl,
};

static struct sdhci_pltfm_data sdhci_dove_pdata = {
    .ops    = &sdhci_dove_ops,
    .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
          SDHCI_QUIRK_NO_BUSY_IRQ |
          SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
          SDHCI_QUIRK_FORCE_DMA |
          SDHCI_QUIRK_NO_HISPD_BIT,
};

static int __devinit sdhci_dove_probe(struct platform_device *pdev)
{
    struct sdhci_host *host;
    struct sdhci_pltfm_host *pltfm_host;
    struct sdhci_dove_priv *priv;
    int ret;

    priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
                GFP_KERNEL);
    if (!priv) {
        dev_err(&pdev->dev, "unable to allocate private data");
        return -ENOMEM;
    }

    priv->clk = clk_get(&pdev->dev, NULL);
    if (!IS_ERR(priv->clk))
        clk_prepare_enable(priv->clk);

    ret = sdhci_pltfm_register(pdev, &sdhci_dove_pdata);
    if (ret)
        goto sdhci_dove_register_fail;

    host = platform_get_drvdata(pdev);
    pltfm_host = sdhci_priv(host);
    pltfm_host->priv = priv;

    return 0;

sdhci_dove_register_fail:
    if (!IS_ERR(priv->clk)) {
        clk_disable_unprepare(priv->clk);
        clk_put(priv->clk);
    }
    return ret;
}

static int __devexit sdhci_dove_remove(struct platform_device *pdev)
{
    struct sdhci_host *host = platform_get_drvdata(pdev);
    struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
    struct sdhci_dove_priv *priv = pltfm_host->priv;

    sdhci_pltfm_unregister(pdev);

    if (!IS_ERR(priv->clk)) {
        clk_disable_unprepare(priv->clk);
        clk_put(priv->clk);
    }
    return 0;
}

static const struct of_device_id sdhci_dove_of_match_table[] __devinitdata = {
    { .compatible = "marvell,dove-sdhci", },
    {}
};
MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);

static struct platform_driver sdhci_dove_driver = {
    .driver     = {
        .name   = "sdhci-dove",
        .owner  = THIS_MODULE,
        .pm = SDHCI_PLTFM_PMOPS,
        .of_match_table = of_match_ptr(sdhci_dove_of_match_table),
    },
    .probe      = sdhci_dove_probe,
    .remove     = __devexit_p(sdhci_dove_remove),
};

module_platform_driver(sdhci_dove_driver);

MODULE_DESCRIPTION("SDHCI driver for Dove");
MODULE_AUTHOR("Saeed Bishara <[email protected]>, "
          "Mike Rapoport <[email protected]>");
MODULE_LICENSE("GPL v2");