[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/slab.h>

#include <asm/io.h>
#include <asm/hardware/scoop.h>

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

/* PCMCIA to Scoop linkage structures for pxa2xx_sharpsl.c
   There is no easy way to link multiple scoop devices into one
   single entity for the pxa2xx_pcmcia device */
int scoop_num;
struct scoop_pcmcia_dev *scoop_devs;

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_CPR) = 0x0000;  // 0C
	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 device *dev, pm_message_t state)
{
	struct scoop_dev *sdev = dev_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 device *dev)
{
	struct scoop_dev *sdev = dev_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 device *dev)
{
	struct scoop_dev *devptr;
	struct scoop_config *inf;
	struct platform_device *pdev = to_platform_device(dev);
	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 = dev->platform_data;
	devptr->base = ioremap(mem->start, mem->end - mem->start + 1);

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

	dev_set_drvdata(dev, 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(dev);
	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 device *dev)
{
	struct scoop_dev *sdev = dev_get_drvdata(dev);
	if (sdev) {
		iounmap(sdev->base);
		kfree(sdev);
		dev_set_drvdata(dev, NULL);
	}
	return 0;
}

static struct device_driver scoop_driver = {
	.name		= "sharp-scoop",
	.bus		= &platform_bus_type,
	.probe		= scoop_probe,
	.remove 	= scoop_remove,
	.suspend	= scoop_suspend,
	.resume		= scoop_resume,
};

int __init scoop_init(void)
{
	return 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 TS	15	#include <linux/string.h>
	16	#include <linux/slab.h>
	17
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
0ce7625f RP	23	/* PCMCIA to Scoop linkage structures for pxa2xx_sharpsl.c
	24	There is no easy way to link multiple scoop devices into one
	25	single entity for the pxa2xx_pcmcia device */
	26	int scoop_num;
	27	struct scoop_pcmcia_dev *scoop_devs;
	28
1da177e4 LT	29	struct scoop_dev {
	30	void *base;
	31	spinlock_t scoop_lock;
7c398988 RP	32	unsigned short suspend_clr;
7c398988 RP	33	unsigned short suspend_set;
1da177e4 LT	34	u32 scoop_gpwr;
	35	};
	36
	37	void reset_scoop(struct device *dev)
	38	{
	39	struct scoop_dev *sdev = dev_get_drvdata(dev);
	40
	41	SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
	42	SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
	43	SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000; // 0C
	44	SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
	45	SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
	46	SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
	47	SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
	48	SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
	49	}
	50
	51	unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
	52	{
	53	unsigned short gpio_bit;
	54	unsigned long flag;
	55	struct scoop_dev *sdev = dev_get_drvdata(dev);
	56
	57	spin_lock_irqsave(&sdev->scoop_lock, flag);
	58	gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) \| bit;
	59	SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
	60	spin_unlock_irqrestore(&sdev->scoop_lock, flag);
	61
	62	return gpio_bit;
	63	}
	64
	65	unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
	66	{
	67	unsigned short gpio_bit;
	68	unsigned long flag;
	69	struct scoop_dev *sdev = dev_get_drvdata(dev);
	70
	71	spin_lock_irqsave(&sdev->scoop_lock, flag);
	72	gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
	73	SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
	74	spin_unlock_irqrestore(&sdev->scoop_lock, flag);
	75
	76	return gpio_bit;
	77	}
	78
	79	EXPORT_SYMBOL(set_scoop_gpio);
	80	EXPORT_SYMBOL(reset_scoop_gpio);
	81
	82	unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
	83	{
	84	struct scoop_dev *sdev = dev_get_drvdata(dev);
	85	return SCOOP_REG(sdev->base,reg);
	86	}
	87
	88	void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
	89	{
	90	struct scoop_dev *sdev = dev_get_drvdata(dev);
	91	SCOOP_REG(sdev->base,reg)=data;
	92	}
	93
	94	EXPORT_SYMBOL(reset_scoop);
	95	EXPORT_SYMBOL(read_scoop_reg);
	96	EXPORT_SYMBOL(write_scoop_reg);
	97
7c398988 RP	98	static void check_scoop_reg(struct scoop_dev *sdev)
	99	{
	100	unsigned short mcr;
	101
	102	mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
	103	if ((mcr & 0x100) == 0)
	104	SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
	105	}
	106
1da177e4	107	#ifdef CONFIG_PM
9480e307	108	static int scoop_suspend(struct device *dev, pm_message_t state)
1da177e4	109	{
9480e307 RK	110	struct scoop_dev *sdev = dev_get_drvdata(dev);
	111
	112	check_scoop_reg(sdev);
	113	sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
	114	SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) \| sdev->suspend_set;
1da177e4	115
1da177e4 LT	116	return 0;
	117	}
	118
9480e307	119	static int scoop_resume(struct device *dev)
1da177e4	120	{
9480e307 RK	121	struct scoop_dev *sdev = dev_get_drvdata(dev);
	122
	123	check_scoop_reg(sdev);
	124	SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
1da177e4	125
1da177e4 LT	126	return 0;
	127	}
	128	#else
	129	#define scoop_suspend NULL
	130	#define scoop_resume NULL
	131	#endif
	132
	133	int __init scoop_probe(struct device *dev)
	134	{
	135	struct scoop_dev *devptr;
	136	struct scoop_config *inf;
	137	struct platform_device *pdev = to_platform_device(dev);
	138	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	139
	140	if (!mem)
	141	return -EINVAL;
	142
	143	devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
	144
	145	if (!devptr)
	146	return -ENOMEM;
	147
	148	memset(devptr, 0, sizeof(struct scoop_dev));
	149	spin_lock_init(&devptr->scoop_lock);
	150
	151	inf = dev->platform_data;
	152	devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
	153
	154	if (!devptr->base) {
	155	kfree(devptr);
	156	return -ENOMEM;
	157	}
	158
	159	dev_set_drvdata(dev, devptr);
	160
	161	printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
	162
	163	SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
	164	reset_scoop(dev);
	165	SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
	166	SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
	167
7c398988 RP	168	devptr->suspend_clr = inf->suspend_clr;
	169	devptr->suspend_set = inf->suspend_set;
	170
1da177e4 LT	171	return 0;
	172	}
	173
	174	static int scoop_remove(struct device *dev)
	175	{
	176	struct scoop_dev *sdev = dev_get_drvdata(dev);
	177	if (sdev) {
	178	iounmap(sdev->base);
	179	kfree(sdev);
	180	dev_set_drvdata(dev, NULL);
	181	}
	182	return 0;
	183	}
	184
	185	static struct device_driver scoop_driver = {
	186	.name = "sharp-scoop",
	187	.bus = &platform_bus_type,
	188	.probe = scoop_probe,
	189	.remove = scoop_remove,
	190	.suspend = scoop_suspend,
	191	.resume = scoop_resume,
	192	};
	193
	194	int __init scoop_init(void)
	195	{
	196	return driver_register(&scoop_driver);
	197	}
	198
	199	subsys_initcall(scoop_init);