tc6387xb.c

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/*
 * Toshiba TC6387XB support
 * Copyright (c) 2005 Ian Molton
 *
 * 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 file contains TC6387XB base support.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mfd/tc6387xb.h>
#include <linux/slab.h>

enum {
    TC6387XB_CELL_MMC,
};

struct tc6387xb {
    void __iomem *scr;
    struct clk *clk32k;
    struct resource rscr;
};

static struct resource tc6387xb_mmc_resources[] = {
    {
        .start = 0x800,
        .end   = 0x9ff,
        .flags = IORESOURCE_MEM,
    },
    {
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_IRQ,
    },
};

/*--------------------------------------------------------------------------*/

#ifdef CONFIG_PM
static int tc6387xb_suspend(struct platform_device *dev, pm_message_t state)
{
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
    struct tc6387xb_platform_data *pdata = dev->dev.platform_data;

    if (pdata && pdata->suspend)
        pdata->suspend(dev);
    clk_disable(tc6387xb->clk32k);

    return 0;
}

static int tc6387xb_resume(struct platform_device *dev)
{
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);
    struct tc6387xb_platform_data *pdata = dev->dev.platform_data;

    clk_enable(tc6387xb->clk32k);
    if (pdata && pdata->resume)
        pdata->resume(dev);

    tmio_core_mmc_resume(tc6387xb->scr + 0x200, 0,
        tc6387xb_mmc_resources[0].start & 0xfffe);

    return 0;
}
#else
#define tc6387xb_suspend  NULL
#define tc6387xb_resume   NULL
#endif

/*--------------------------------------------------------------------------*/

static void tc6387xb_mmc_pwr(struct platform_device *mmc, int state)
{
    struct platform_device *dev = to_platform_device(mmc->dev.parent);
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);

    tmio_core_mmc_pwr(tc6387xb->scr + 0x200, 0, state);
}

static void tc6387xb_mmc_clk_div(struct platform_device *mmc, int state)
{
    struct platform_device *dev = to_platform_device(mmc->dev.parent);
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);

    tmio_core_mmc_clk_div(tc6387xb->scr + 0x200, 0, state);
}


static int tc6387xb_mmc_enable(struct platform_device *mmc)
{
    struct platform_device *dev      = to_platform_device(mmc->dev.parent);
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);

    clk_enable(tc6387xb->clk32k);

    tmio_core_mmc_enable(tc6387xb->scr + 0x200, 0,
        tc6387xb_mmc_resources[0].start & 0xfffe);

    return 0;
}

static int tc6387xb_mmc_disable(struct platform_device *mmc)
{
    struct platform_device *dev      = to_platform_device(mmc->dev.parent);
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);

    clk_disable(tc6387xb->clk32k);

    return 0;
}

static struct tmio_mmc_data tc6387xb_mmc_data = {
    .hclk = 24000000,
    .set_pwr = tc6387xb_mmc_pwr,
    .set_clk_div = tc6387xb_mmc_clk_div,
};

/*--------------------------------------------------------------------------*/

static struct mfd_cell tc6387xb_cells[] = {
    [TC6387XB_CELL_MMC] = {
        .name = "tmio-mmc",
        .enable = tc6387xb_mmc_enable,
        .disable = tc6387xb_mmc_disable,
        .platform_data = &tc6387xb_mmc_data,
        .pdata_size    = sizeof(tc6387xb_mmc_data),
        .num_resources = ARRAY_SIZE(tc6387xb_mmc_resources),
        .resources = tc6387xb_mmc_resources,
    },
};

static int __devinit tc6387xb_probe(struct platform_device *dev)
{
    struct tc6387xb_platform_data *pdata = dev->dev.platform_data;
    struct resource *iomem, *rscr;
    struct clk *clk32k;
    struct tc6387xb *tc6387xb;
    int irq, ret;

    iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
    if (!iomem) {
        return -EINVAL;
    }

    tc6387xb = kzalloc(sizeof *tc6387xb, GFP_KERNEL);
    if (!tc6387xb)
        return -ENOMEM;

    ret  = platform_get_irq(dev, 0);
    if (ret >= 0)
        irq = ret;
    else
        goto err_no_irq;

    clk32k = clk_get(&dev->dev, "CLK_CK32K");
    if (IS_ERR(clk32k)) {
        ret = PTR_ERR(clk32k);
        goto err_no_clk;
    }

    rscr = &tc6387xb->rscr;
    rscr->name = "tc6387xb-core";
    rscr->start = iomem->start;
    rscr->end = iomem->start + 0xff;
    rscr->flags = IORESOURCE_MEM;

    ret = request_resource(iomem, rscr);
    if (ret)
        goto err_resource;

    tc6387xb->scr = ioremap(rscr->start, resource_size(rscr));
    if (!tc6387xb->scr) {
        ret = -ENOMEM;
        goto err_ioremap;
    }

    tc6387xb->clk32k = clk32k;
    platform_set_drvdata(dev, tc6387xb);

    if (pdata && pdata->enable)
        pdata->enable(dev);

    printk(KERN_INFO "Toshiba tc6387xb initialised\n");

    ret = mfd_add_devices(&dev->dev, dev->id, tc6387xb_cells,
                  ARRAY_SIZE(tc6387xb_cells), iomem, irq, NULL);

    if (!ret)
        return 0;

    iounmap(tc6387xb->scr);
err_ioremap:
    release_resource(&tc6387xb->rscr);
err_resource:
    clk_put(clk32k);
err_no_clk:
err_no_irq:
    kfree(tc6387xb);
    return ret;
}

static int __devexit tc6387xb_remove(struct platform_device *dev)
{
    struct tc6387xb *tc6387xb = platform_get_drvdata(dev);

    mfd_remove_devices(&dev->dev);
    iounmap(tc6387xb->scr);
    release_resource(&tc6387xb->rscr);
    clk_disable(tc6387xb->clk32k);
    clk_put(tc6387xb->clk32k);
    platform_set_drvdata(dev, NULL);
    kfree(tc6387xb);

    return 0;
}


static struct platform_driver tc6387xb_platform_driver = {
    .driver = {
        .name       = "tc6387xb",
    },
    .probe      = tc6387xb_probe,
    .remove     = __devexit_p(tc6387xb_remove),
    .suspend        = tc6387xb_suspend,
    .resume         = tc6387xb_resume,
};

module_platform_driver(tc6387xb_platform_driver);

MODULE_DESCRIPTION("Toshiba TC6387XB core driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ian Molton");
MODULE_ALIAS("platform:tc6387xb");