sdhci-pltfm.c

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/*
 * sdhci-pltfm.c Support for SDHCI platform devices
 * Copyright (c) 2009 Intel Corporation
 *
 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
 * Copyright (c) 2009 MontaVista Software, Inc.
 *
 * Authors: Xiaobo Xie <[email protected]>
 *      Anton Vorontsov <[email protected]>
 *
 * 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.
 */

/* Supports:
 * SDHCI platform devices
 *
 * Inspired by sdhci-pci.c, by Pierre Ossman
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#ifdef CONFIG_PPC
#include <asm/machdep.h>
#endif
#include "sdhci-pltfm.h"

static struct sdhci_ops sdhci_pltfm_ops = {
};

#ifdef CONFIG_OF
static bool sdhci_of_wp_inverted(struct device_node *np)
{
    if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
        of_get_property(np, "wp-inverted", NULL))
        return true;

    /* Old device trees don't have the wp-inverted property. */
#ifdef CONFIG_PPC
    return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
#else
    return false;
#endif /* CONFIG_PPC */
}

void sdhci_get_of_property(struct platform_device *pdev)
{
    struct device_node *np = pdev->dev.of_node;
    struct sdhci_host *host = platform_get_drvdata(pdev);
    struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
    const __be32 *clk;
    u32 bus_width;
    int size;

    if (of_device_is_available(np)) {
        if (of_get_property(np, "sdhci,auto-cmd12", NULL))
            host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;

        if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
            (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
            bus_width == 1))
            host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;

        if (sdhci_of_wp_inverted(np))
            host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;

        if (of_get_property(np, "broken-cd", NULL))
            host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;

        if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
            host->quirks |= SDHCI_QUIRK_BROKEN_DMA;

        if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
            of_device_is_compatible(np, "fsl,p1010-esdhc") ||
            of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
            host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;

        clk = of_get_property(np, "clock-frequency", &size);
        if (clk && size == sizeof(*clk) && *clk)
            pltfm_host->clock = be32_to_cpup(clk);
    }
}
#else
void sdhci_get_of_property(struct platform_device *pdev) {}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(sdhci_get_of_property);

struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
                    struct sdhci_pltfm_data *pdata)
{
    struct sdhci_host *host;
    struct sdhci_pltfm_host *pltfm_host;
    struct device_node *np = pdev->dev.of_node;
    struct resource *iomem;
    int ret;

    iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!iomem) {
        ret = -ENOMEM;
        goto err;
    }

    if (resource_size(iomem) < 0x100)
        dev_err(&pdev->dev, "Invalid iomem size!\n");

    /* Some PCI-based MFD need the parent here */
    if (pdev->dev.parent != &platform_bus && !np)
        host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
    else
        host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));

    if (IS_ERR(host)) {
        ret = PTR_ERR(host);
        goto err;
    }

    pltfm_host = sdhci_priv(host);

    host->hw_name = dev_name(&pdev->dev);
    if (pdata && pdata->ops)
        host->ops = pdata->ops;
    else
        host->ops = &sdhci_pltfm_ops;
    if (pdata)
        host->quirks = pdata->quirks;
    host->irq = platform_get_irq(pdev, 0);

    if (!request_mem_region(iomem->start, resource_size(iomem),
        mmc_hostname(host->mmc))) {
        dev_err(&pdev->dev, "cannot request region\n");
        ret = -EBUSY;
        goto err_request;
    }

    host->ioaddr = ioremap(iomem->start, resource_size(iomem));
    if (!host->ioaddr) {
        dev_err(&pdev->dev, "failed to remap registers\n");
        ret = -ENOMEM;
        goto err_remap;
    }

    /*
     * Some platforms need to probe the controller to be able to
     * determine which caps should be used.
     */
    if (host->ops && host->ops->platform_init)
        host->ops->platform_init(host);

    platform_set_drvdata(pdev, host);

    return host;

err_remap:
    release_mem_region(iomem->start, resource_size(iomem));
err_request:
    sdhci_free_host(host);
err:
    dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
    return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_init);

void sdhci_pltfm_free(struct platform_device *pdev)
{
    struct sdhci_host *host = platform_get_drvdata(pdev);
    struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

    iounmap(host->ioaddr);
    release_mem_region(iomem->start, resource_size(iomem));
    sdhci_free_host(host);
    platform_set_drvdata(pdev, NULL);
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_free);

int sdhci_pltfm_register(struct platform_device *pdev,
             struct sdhci_pltfm_data *pdata)
{
    struct sdhci_host *host;
    int ret = 0;

    host = sdhci_pltfm_init(pdev, pdata);
    if (IS_ERR(host))
        return PTR_ERR(host);

    sdhci_get_of_property(pdev);

    ret = sdhci_add_host(host);
    if (ret)
        sdhci_pltfm_free(pdev);

    return ret;
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_register);

int sdhci_pltfm_unregister(struct platform_device *pdev)
{
    struct sdhci_host *host = platform_get_drvdata(pdev);
    int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);

    sdhci_remove_host(host, dead);
    sdhci_pltfm_free(pdev);

    return 0;
}
EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);

#ifdef CONFIG_PM
static int sdhci_pltfm_suspend(struct device *dev)
{
    struct sdhci_host *host = dev_get_drvdata(dev);

    return sdhci_suspend_host(host);
}

static int sdhci_pltfm_resume(struct device *dev)
{
    struct sdhci_host *host = dev_get_drvdata(dev);

    return sdhci_resume_host(host);
}

const struct dev_pm_ops sdhci_pltfm_pmops = {
    .suspend    = sdhci_pltfm_suspend,
    .resume     = sdhci_pltfm_resume,
};
EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
#endif  /* CONFIG_PM */

static int __init sdhci_pltfm_drv_init(void)
{
    pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");

    return 0;
}
module_init(sdhci_pltfm_drv_init);

static void __exit sdhci_pltfm_drv_exit(void)
{
}
module_exit(sdhci_pltfm_drv_exit);

MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");