[deliverable/linux.git] / arch / arm / common / scoop.c

/*
 * Support code for the SCOOP interface found on various Sharp PDAs
 *
 * Copyright (c) 2004 Richard Purdie
 *
 *	Based on code written by Sharp/Lineo for 2.4 kernels
 *
 * 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.
 *
 */

#include <linux/device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/hardware/scoop.h>

#define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))

struct  scoop_dev {
	void  *base;
	spinlock_t scoop_lock;
	unsigned short suspend_clr;
	unsigned short suspend_set;
	u32 scoop_gpwr;
};

void reset_scoop(struct device *dev)
{
	struct scoop_dev *sdev = dev_get_drvdata(dev);

	SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
	SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
	SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
	SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
	SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
	SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
	SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
}

unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
{
	unsigned short gpio_bit;
	unsigned long flag;
	struct scoop_dev *sdev = dev_get_drvdata(dev);

	spin_lock_irqsave(&sdev->scoop_lock, flag);
	gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
	SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
	spin_unlock_irqrestore(&sdev->scoop_lock, flag);

	return gpio_bit;
}

unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
{
	unsigned short gpio_bit;
	unsigned long flag;
	struct scoop_dev *sdev = dev_get_drvdata(dev);

	spin_lock_irqsave(&sdev->scoop_lock, flag);
	gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
	SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
	spin_unlock_irqrestore(&sdev->scoop_lock, flag);

	return gpio_bit;
}

EXPORT_SYMBOL(set_scoop_gpio);
EXPORT_SYMBOL(reset_scoop_gpio);

unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
{
	struct scoop_dev *sdev = dev_get_drvdata(dev);
	return SCOOP_REG(sdev->base,reg);
}

void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
{
	struct scoop_dev *sdev = dev_get_drvdata(dev);
	SCOOP_REG(sdev->base,reg)=data;
}

EXPORT_SYMBOL(reset_scoop);
EXPORT_SYMBOL(read_scoop_reg);
EXPORT_SYMBOL(write_scoop_reg);

static void check_scoop_reg(struct scoop_dev *sdev)
{
	unsigned short mcr;

	mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
	if ((mcr & 0x100) == 0)
		SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
}

#ifdef CONFIG_PM
static int scoop_suspend(struct platform_device *dev, pm_message_t state)
{
	struct scoop_dev *sdev = platform_get_drvdata(dev);

	check_scoop_reg(sdev);
	sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
	SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;

	return 0;
}

static int scoop_resume(struct platform_device *dev)
{
	struct scoop_dev *sdev = platform_get_drvdata(dev);

	check_scoop_reg(sdev);
	SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;

	return 0;
}
#else
#define scoop_suspend	NULL
#define scoop_resume	NULL
#endif

int __init scoop_probe(struct platform_device *pdev)
{
	struct scoop_dev *devptr;
	struct scoop_config *inf;
	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!mem)
		return -EINVAL;

	devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);

	if (!devptr)
		return  -ENOMEM;

	memset(devptr, 0, sizeof(struct scoop_dev));
	spin_lock_init(&devptr->scoop_lock);

	inf = pdev->dev.platform_data;
	devptr->base = ioremap(mem->start, mem->end - mem->start + 1);

	if (!devptr->base) {
		kfree(devptr);
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, devptr);

	printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);

	SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
	reset_scoop(&pdev->dev);
	SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
	SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
	SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;

	devptr->suspend_clr = inf->suspend_clr;
	devptr->suspend_set = inf->suspend_set;

	return 0;
}

static int scoop_remove(struct platform_device *pdev)
{
	struct scoop_dev *sdev = platform_get_drvdata(pdev);
	if (sdev) {
		iounmap(sdev->base);
		kfree(sdev);
		platform_set_drvdata(pdev, NULL);
	}
	return 0;
}

static struct platform_driver scoop_driver = {
	.probe		= scoop_probe,
	.remove 	= scoop_remove,
	.suspend	= scoop_suspend,
	.resume		= scoop_resume,
	.driver		= {
		.name	= "sharp-scoop",
	},
};

int __init scoop_init(void)
{
	return platform_driver_register(&scoop_driver);
}

subsys_initcall(scoop_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Support code for the SCOOP interface found on various Sharp PDAs
	3	*
	4	* Copyright (c) 2004 Richard Purdie
	5	*
	6	* Based on code written by Sharp/Lineo for 2.4 kernels
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/device.h>
4e57b681	15	#include <linux/string.h>
de25968c	16	#include <linux/slab.h>
d052d1be	17	#include <linux/platform_device.h>
1da177e4 LT	18	#include <asm/io.h>
	19	#include <asm/hardware/scoop.h>
	20
	21	#define SCOOP_REG(d,adr) ((volatile unsigned short)(d +(adr)))
	22
	23	struct scoop_dev {
	24	void *base;
	25	spinlock_t scoop_lock;
7c398988 RP	26	unsigned short suspend_clr;
7c398988 RP	27	unsigned short suspend_set;
1da177e4 LT	28	u32 scoop_gpwr;
	29	};
	30
	31	void reset_scoop(struct device *dev)
	32	{
	33	struct scoop_dev *sdev = dev_get_drvdata(dev);
	34
	35	SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
	36	SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
1da177e4 LT	37	SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
	38	SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
	39	SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
	40	SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
	41	SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
	42	}
	43
	44	unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
	45	{
	46	unsigned short gpio_bit;
	47	unsigned long flag;
	48	struct scoop_dev *sdev = dev_get_drvdata(dev);
	49
	50	spin_lock_irqsave(&sdev->scoop_lock, flag);
	51	gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) \| bit;
	52	SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
	53	spin_unlock_irqrestore(&sdev->scoop_lock, flag);
	54
	55	return gpio_bit;
	56	}
	57
	58	unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
	59	{
	60	unsigned short gpio_bit;
	61	unsigned long flag;
	62	struct scoop_dev *sdev = dev_get_drvdata(dev);
	63
	64	spin_lock_irqsave(&sdev->scoop_lock, flag);
	65	gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
	66	SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
	67	spin_unlock_irqrestore(&sdev->scoop_lock, flag);
	68
	69	return gpio_bit;
	70	}
	71
	72	EXPORT_SYMBOL(set_scoop_gpio);
	73	EXPORT_SYMBOL(reset_scoop_gpio);
	74
	75	unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
	76	{
	77	struct scoop_dev *sdev = dev_get_drvdata(dev);
	78	return SCOOP_REG(sdev->base,reg);
	79	}
	80
	81	void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
	82	{
	83	struct scoop_dev *sdev = dev_get_drvdata(dev);
	84	SCOOP_REG(sdev->base,reg)=data;
	85	}
	86
	87	EXPORT_SYMBOL(reset_scoop);
	88	EXPORT_SYMBOL(read_scoop_reg);
	89	EXPORT_SYMBOL(write_scoop_reg);
	90
7c398988 RP	91	static void check_scoop_reg(struct scoop_dev *sdev)
	92	{
	93	unsigned short mcr;
	94
	95	mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
	96	if ((mcr & 0x100) == 0)
	97	SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
	98	}
	99
1da177e4	100	#ifdef CONFIG_PM
3ae5eaec	101	static int scoop_suspend(struct platform_device *dev, pm_message_t state)
1da177e4	102	{
3ae5eaec	103	struct scoop_dev *sdev = platform_get_drvdata(dev);
9480e307 RK	104
	105	check_scoop_reg(sdev);
	106	sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
	107	SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) \| sdev->suspend_set;
1da177e4	108
1da177e4 LT	109	return 0;
	110	}
	111
3ae5eaec	112	static int scoop_resume(struct platform_device *dev)
1da177e4	113	{
3ae5eaec	114	struct scoop_dev *sdev = platform_get_drvdata(dev);
9480e307 RK	115
	116	check_scoop_reg(sdev);
	117	SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
1da177e4	118
1da177e4 LT	119	return 0;
	120	}
	121	#else
	122	#define scoop_suspend NULL
	123	#define scoop_resume NULL
	124	#endif
	125
3ae5eaec	126	int __init scoop_probe(struct platform_device *pdev)
1da177e4 LT	127	{
	128	struct scoop_dev *devptr;
	129	struct scoop_config *inf;
1da177e4 LT	130	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	131
	132	if (!mem)
	133	return -EINVAL;
	134
	135	devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
	136
	137	if (!devptr)
	138	return -ENOMEM;
	139
	140	memset(devptr, 0, sizeof(struct scoop_dev));
	141	spin_lock_init(&devptr->scoop_lock);
	142
3ae5eaec	143	inf = pdev->dev.platform_data;
1da177e4 LT	144	devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
	145
	146	if (!devptr->base) {
	147	kfree(devptr);
	148	return -ENOMEM;
	149	}
	150
3ae5eaec	151	platform_set_drvdata(pdev, devptr);
1da177e4 LT	152
	153	printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
	154
	155	SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
c35bf4a5	156	reset_scoop(&pdev->dev);
945b9579	157	SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
1da177e4 LT	158	SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
	159	SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
	160
7c398988 RP	161	devptr->suspend_clr = inf->suspend_clr;
	162	devptr->suspend_set = inf->suspend_set;
	163
1da177e4 LT	164	return 0;
	165	}
	166
3ae5eaec	167	static int scoop_remove(struct platform_device *pdev)
1da177e4	168	{
3ae5eaec	169	struct scoop_dev *sdev = platform_get_drvdata(pdev);
1da177e4 LT	170	if (sdev) {
	171	iounmap(sdev->base);
	172	kfree(sdev);
3ae5eaec	173	platform_set_drvdata(pdev, NULL);
1da177e4 LT	174	}
	175	return 0;
	176	}
	177
3ae5eaec	178	static struct platform_driver scoop_driver = {
1da177e4 LT	179	.probe = scoop_probe,
	180	.remove = scoop_remove,
	181	.suspend = scoop_suspend,
	182	.resume = scoop_resume,
3ae5eaec RK	183	.driver = {
	184	.name = "sharp-scoop",
	185	},
1da177e4 LT	186	};
	187
	188	int __init scoop_init(void)
	189	{
3ae5eaec	190	return platform_driver_register(&scoop_driver);
1da177e4 LT	191	}
	192
	193	subsys_initcall(scoop_init);