drivers/mfd/t7l66xb.c - arm/linux - Git at Google


            
            /*

            
             *

            
             * 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_prepare_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_unprepare(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(struct irq_desc *desc)

            
            {

            
            	struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);

            
            	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);

            
            	}


            	irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);

            
            	irq_set_chained_handler_and_data(t7l66xb->irq, t7l66xb_irq, t7l66xb);

            
            }


            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_and_data(t7l66xb->irq, NULL, NULL);


            	for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {

            
            		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_get_platdata(&dev->dev);


            	if (pdata && pdata->suspend)

            
            		pdata->suspend(dev);

            
            	clk_disable_unprepare(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_get_platdata(&dev->dev);


            	clk_prepare_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_get_platdata(&dev->dev);

            
            	struct t7l66xb *t7l66xb;

            
            	struct resource *iomem, *rscr;

            
            	int ret;


            	if (!pdata)

            
            		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_prepare_enable(t7l66xb->clk48m);


            	if (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_get_platdata(&dev->dev);

            
            	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);

            
            	int ret;


            	ret = pdata->disable(dev);

            
            	clk_disable_unprepare(t7l66xb->clk48m);

            
            	clk_put(t7l66xb->clk48m);

            
            	clk_disable_unprepare(t7l66xb->clk32k);

            
            	clk_put(t7l66xb->clk32k);

            
            	t7l66xb_detach_irq(dev);

            
            	iounmap(t7l66xb->scr);

            
            	release_resource(&t7l66xb->rscr);

            
            	mfd_remove_devices(&dev->dev);

            
            	kfree(t7l66xb);


            	return ret;


            }


            static struct platform_driver t7l66xb_platform_driver = {

            
            	.driver = {

            
            		.name	= "t7l66xb",

            
            	},

            
            	.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");
	/*
	*
	* 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_prepare_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_unprepare(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(struct irq_desc *desc)
	{
	struct t7l66xb *t7l66xb = irq_desc_get_handler_data(desc);
	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);
	}

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

	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_and_data(t7l66xb->irq, NULL, NULL);

	for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
	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_get_platdata(&dev->dev);

	if (pdata && pdata->suspend)
	pdata->suspend(dev);
	clk_disable_unprepare(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_get_platdata(&dev->dev);

	clk_prepare_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_get_platdata(&dev->dev);
	struct t7l66xb *t7l66xb;
	struct resource iomem, rscr;
	int ret;

	if (!pdata)
	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_prepare_enable(t7l66xb->clk48m);

	if (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_get_platdata(&dev->dev);
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	int ret;

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

	return ret;

	}

	static struct platform_driver t7l66xb_platform_driver = {
	.driver = {
	.name = "t7l66xb",
	},
	.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");