t7l66xb.c

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/*
 *
 * Toshiba T7L66XB core mfd support
 *
 * Copyright (c) 2005, 2007, 2008 Ian Molton
 * Copyright (c) 2008 Dmitry Baryshkov
 *
 * 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.
 *
 * T7L66 features:
 *
 * Supported in this driver:
 * SD/MMC
 * SM/NAND flash controller
 *
 * As yet not supported
 * GPIO interface (on NAND pins)
 * Serial interface
 * TFT 'interface converter'
 * PCMCIA interface logic
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mfd/t7l66xb.h>

enum {
    T7L66XB_CELL_NAND,
    T7L66XB_CELL_MMC,
};

static const struct resource t7l66xb_mmc_resources[] = {
    {
        .start = 0x800,
        .end    = 0x9ff,
        .flags = IORESOURCE_MEM,
    },
    {
        .start = IRQ_T7L66XB_MMC,
        .end    = IRQ_T7L66XB_MMC,
        .flags = IORESOURCE_IRQ,
    },
};

#define SCR_REVID   0x08        /* b Revision ID    */
#define SCR_IMR     0x42        /* b Interrupt Mask */
#define SCR_DEV_CTL 0xe0        /* b Device control */
#define SCR_ISR     0xe1        /* b Interrupt Status   */
#define SCR_GPO_OC  0xf0        /* b GPO output control */
#define SCR_GPO_OS  0xf1        /* b GPO output enable  */
#define SCR_GPI_S   0xf2        /* w GPI status     */
#define SCR_APDC    0xf8        /* b Active pullup down ctrl */

#define SCR_DEV_CTL_USB     BIT(0)  /* USB enable       */
#define SCR_DEV_CTL_MMC     BIT(1)  /* MMC enable       */

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

struct t7l66xb {
    void __iomem        *scr;
    /* Lock to protect registers requiring read/modify/write ops. */
    spinlock_t      lock;

    struct resource     rscr;
    struct clk      *clk48m;
    struct clk      *clk32k;
    int         irq;
    int         irq_base;
};

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

static int t7l66xb_mmc_enable(struct platform_device *mmc)
{
    struct platform_device *dev = to_platform_device(mmc->dev.parent);
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    unsigned long flags;
    u8 dev_ctl;

    clk_enable(t7l66xb->clk32k);

    spin_lock_irqsave(&t7l66xb->lock, flags);

    dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
    dev_ctl |= SCR_DEV_CTL_MMC;
    tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);

    spin_unlock_irqrestore(&t7l66xb->lock, flags);

    tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
        t7l66xb_mmc_resources[0].start & 0xfffe);

    return 0;
}

static int t7l66xb_mmc_disable(struct platform_device *mmc)
{
    struct platform_device *dev = to_platform_device(mmc->dev.parent);
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    unsigned long flags;
    u8 dev_ctl;

    spin_lock_irqsave(&t7l66xb->lock, flags);

    dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
    dev_ctl &= ~SCR_DEV_CTL_MMC;
    tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);

    spin_unlock_irqrestore(&t7l66xb->lock, flags);

    clk_disable(t7l66xb->clk32k);

    return 0;
}

static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
{
    struct platform_device *dev = to_platform_device(mmc->dev.parent);
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);

    tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
}

static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
{
    struct platform_device *dev = to_platform_device(mmc->dev.parent);
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);

    tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
}

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

static struct tmio_mmc_data t7166xb_mmc_data = {
    .hclk = 24000000,
    .set_pwr = t7l66xb_mmc_pwr,
    .set_clk_div = t7l66xb_mmc_clk_div,
};

static const struct resource t7l66xb_nand_resources[] = {
    {
        .start  = 0xc00,
        .end    = 0xc07,
        .flags  = IORESOURCE_MEM,
    },
    {
        .start  = 0x0100,
        .end    = 0x01ff,
        .flags  = IORESOURCE_MEM,
    },
    {
        .start  = IRQ_T7L66XB_NAND,
        .end    = IRQ_T7L66XB_NAND,
        .flags  = IORESOURCE_IRQ,
    },
};

static struct mfd_cell t7l66xb_cells[] = {
    [T7L66XB_CELL_MMC] = {
        .name = "tmio-mmc",
        .enable = t7l66xb_mmc_enable,
        .disable = t7l66xb_mmc_disable,
        .platform_data = &t7166xb_mmc_data,
        .pdata_size    = sizeof(t7166xb_mmc_data),
        .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
        .resources = t7l66xb_mmc_resources,
    },
    [T7L66XB_CELL_NAND] = {
        .name = "tmio-nand",
        .num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
        .resources = t7l66xb_nand_resources,
    },
};

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

/* Handle the T7L66XB interrupt mux */
static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
{
    struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
    unsigned int isr;
    unsigned int i, irq_base;

    irq_base = t7l66xb->irq_base;

    while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
                ~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
        for (i = 0; i < T7L66XB_NR_IRQS; i++)
            if (isr & (1 << i))
                generic_handle_irq(irq_base + i);
}

static void t7l66xb_irq_mask(struct irq_data *data)
{
    struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
    unsigned long           flags;
    u8 imr;

    spin_lock_irqsave(&t7l66xb->lock, flags);
    imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
    imr |= 1 << (data->irq - t7l66xb->irq_base);
    tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
    spin_unlock_irqrestore(&t7l66xb->lock, flags);
}

static void t7l66xb_irq_unmask(struct irq_data *data)
{
    struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
    unsigned long flags;
    u8 imr;

    spin_lock_irqsave(&t7l66xb->lock, flags);
    imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
    imr &= ~(1 << (data->irq - t7l66xb->irq_base));
    tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
    spin_unlock_irqrestore(&t7l66xb->lock, flags);
}

static struct irq_chip t7l66xb_chip = {
    .name       = "t7l66xb",
    .irq_ack    = t7l66xb_irq_mask,
    .irq_mask   = t7l66xb_irq_mask,
    .irq_unmask = t7l66xb_irq_unmask,
};

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

/* Install the IRQ handler */
static void t7l66xb_attach_irq(struct platform_device *dev)
{
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    unsigned int irq, irq_base;

    irq_base = t7l66xb->irq_base;

    for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
        irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
        irq_set_chip_data(irq, t7l66xb);
#ifdef CONFIG_ARM
        set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
#endif
    }

    irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
    irq_set_handler_data(t7l66xb->irq, t7l66xb);
    irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq);
}

static void t7l66xb_detach_irq(struct platform_device *dev)
{
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    unsigned int irq, irq_base;

    irq_base = t7l66xb->irq_base;

    irq_set_chained_handler(t7l66xb->irq, NULL);
    irq_set_handler_data(t7l66xb->irq, NULL);

    for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
#ifdef CONFIG_ARM
        set_irq_flags(irq, 0);
#endif
        irq_set_chip(irq, NULL);
        irq_set_chip_data(irq, NULL);
    }
}

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

#ifdef CONFIG_PM
static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
{
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    struct t7l66xb_platform_data *pdata = dev->dev.platform_data;

    if (pdata && pdata->suspend)
        pdata->suspend(dev);
    clk_disable(t7l66xb->clk48m);

    return 0;
}

static int t7l66xb_resume(struct platform_device *dev)
{
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    struct t7l66xb_platform_data *pdata = dev->dev.platform_data;

    clk_enable(t7l66xb->clk48m);
    if (pdata && pdata->resume)
        pdata->resume(dev);

    tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
        t7l66xb_mmc_resources[0].start & 0xfffe);

    return 0;
}
#else
#define t7l66xb_suspend NULL
#define t7l66xb_resume  NULL
#endif

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

static int t7l66xb_probe(struct platform_device *dev)
{
    struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
    struct t7l66xb *t7l66xb;
    struct resource *iomem, *rscr;
    int ret;

    if (pdata == NULL)
        return -EINVAL;

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

    t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
    if (!t7l66xb)
        return -ENOMEM;

    spin_lock_init(&t7l66xb->lock);

    platform_set_drvdata(dev, t7l66xb);

    ret = platform_get_irq(dev, 0);
    if (ret >= 0)
        t7l66xb->irq = ret;
    else
        goto err_noirq;

    t7l66xb->irq_base = pdata->irq_base;

    t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
    if (IS_ERR(t7l66xb->clk32k)) {
        ret = PTR_ERR(t7l66xb->clk32k);
        goto err_clk32k_get;
    }

    t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
    if (IS_ERR(t7l66xb->clk48m)) {
        ret = PTR_ERR(t7l66xb->clk48m);
        goto err_clk48m_get;
    }

    rscr = &t7l66xb->rscr;
    rscr->name = "t7l66xb-core";
    rscr->start = iomem->start;
    rscr->end = iomem->start + 0xff;
    rscr->flags = IORESOURCE_MEM;

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

    t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
    if (!t7l66xb->scr) {
        ret = -ENOMEM;
        goto err_ioremap;
    }

    clk_enable(t7l66xb->clk48m);

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

    /* Mask all interrupts */
    tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);

    printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
        dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
        (unsigned long)iomem->start, t7l66xb->irq);

    t7l66xb_attach_irq(dev);

    t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
    t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);

    ret = mfd_add_devices(&dev->dev, dev->id,
                  t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
                  iomem, t7l66xb->irq_base, NULL);

    if (!ret)
        return 0;

    t7l66xb_detach_irq(dev);
    iounmap(t7l66xb->scr);
err_ioremap:
    release_resource(&t7l66xb->rscr);
err_request_scr:
    clk_put(t7l66xb->clk48m);
err_clk48m_get:
    clk_put(t7l66xb->clk32k);
err_clk32k_get:
err_noirq:
    kfree(t7l66xb);
    return ret;
}

static int t7l66xb_remove(struct platform_device *dev)
{
    struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
    struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
    int ret;

    ret = pdata->disable(dev);
    clk_disable(t7l66xb->clk48m);
    clk_put(t7l66xb->clk48m);
    clk_disable(t7l66xb->clk32k);
    clk_put(t7l66xb->clk32k);
    t7l66xb_detach_irq(dev);
    iounmap(t7l66xb->scr);
    release_resource(&t7l66xb->rscr);
    mfd_remove_devices(&dev->dev);
    platform_set_drvdata(dev, NULL);
    kfree(t7l66xb);

    return ret;

}

static struct platform_driver t7l66xb_platform_driver = {
    .driver = {
        .name   = "t7l66xb",
        .owner  = THIS_MODULE,
    },
    .suspend    = t7l66xb_suspend,
    .resume     = t7l66xb_resume,
    .probe      = t7l66xb_probe,
    .remove     = t7l66xb_remove,
};

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

module_platform_driver(t7l66xb_platform_driver);

MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ian Molton");
MODULE_ALIAS("platform:t7l66xb");