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