summaryrefslogtreecommitdiffstats
path: root/arch/arm/common/scoop.c
blob: cfd0d3e550d9ef6d1af15982862904283130eed2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*
 * 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 <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;
	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);

#ifdef CONFIG_PM
static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
{
	if (level == SUSPEND_POWER_DOWN) {
		struct scoop_dev *sdev = dev_get_drvdata(dev);

		sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
		SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
	}
	return 0;
}

static int scoop_resume(struct device *dev, uint32_t level)
{
	if (level == RESUME_POWER_ON) {
		struct scoop_dev *sdev = dev_get_drvdata(dev);

		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;

	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);
OpenPOWER on IntegriCloud