Linux-2.6.12-rc2
[linux-3.10.git] / arch / arm / common / scoop.c
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>
15 #include <asm/io.h>
16 #include <asm/hardware/scoop.h>
17
18 #define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
19
20 struct  scoop_dev {
21         void  *base;
22         spinlock_t scoop_lock;
23         u32 scoop_gpwr;
24 };
25
26 void reset_scoop(struct device *dev)
27 {
28         struct scoop_dev *sdev = dev_get_drvdata(dev);
29
30         SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
31         SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
32         SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000;  // 0C
33         SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
34         SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
35         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
36         SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
37         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
38 }
39
40 unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
41 {
42         unsigned short gpio_bit;
43         unsigned long flag;
44         struct scoop_dev *sdev = dev_get_drvdata(dev);
45
46         spin_lock_irqsave(&sdev->scoop_lock, flag);
47         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
48         SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
49         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
50
51         return gpio_bit;
52 }
53
54 unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
55 {
56         unsigned short gpio_bit;
57         unsigned long flag;
58         struct scoop_dev *sdev = dev_get_drvdata(dev);
59
60         spin_lock_irqsave(&sdev->scoop_lock, flag);
61         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
62         SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
63         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
64
65         return gpio_bit;
66 }
67
68 EXPORT_SYMBOL(set_scoop_gpio);
69 EXPORT_SYMBOL(reset_scoop_gpio);
70
71 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
72 {
73         struct scoop_dev *sdev = dev_get_drvdata(dev);
74         return SCOOP_REG(sdev->base,reg);
75 }
76
77 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
78 {
79         struct scoop_dev *sdev = dev_get_drvdata(dev);
80         SCOOP_REG(sdev->base,reg)=data;
81 }
82
83 EXPORT_SYMBOL(reset_scoop);
84 EXPORT_SYMBOL(read_scoop_reg);
85 EXPORT_SYMBOL(write_scoop_reg);
86
87 #ifdef CONFIG_PM
88 static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
89 {
90         if (level == SUSPEND_POWER_DOWN) {
91                 struct scoop_dev *sdev = dev_get_drvdata(dev);
92
93                 sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
94                 SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
95         }
96         return 0;
97 }
98
99 static int scoop_resume(struct device *dev, uint32_t level)
100 {
101         if (level == RESUME_POWER_ON) {
102                 struct scoop_dev *sdev = dev_get_drvdata(dev);
103
104                 SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
105         }
106         return 0;
107 }
108 #else
109 #define scoop_suspend   NULL
110 #define scoop_resume    NULL
111 #endif
112
113 int __init scoop_probe(struct device *dev)
114 {
115         struct scoop_dev *devptr;
116         struct scoop_config *inf;
117         struct platform_device *pdev = to_platform_device(dev);
118         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
119
120         if (!mem)
121                 return -EINVAL;
122
123         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
124
125         if (!devptr)
126                 return  -ENOMEM;
127
128         memset(devptr, 0, sizeof(struct scoop_dev));
129         spin_lock_init(&devptr->scoop_lock);
130
131         inf = dev->platform_data;
132         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
133
134         if (!devptr->base) {
135                 kfree(devptr);
136                 return -ENOMEM;
137         }
138
139         dev_set_drvdata(dev, devptr);
140
141         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
142
143         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
144         reset_scoop(dev);
145         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
146         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
147
148         return 0;
149 }
150
151 static int scoop_remove(struct device *dev)
152 {
153         struct scoop_dev *sdev = dev_get_drvdata(dev);
154         if (sdev) {
155                 iounmap(sdev->base);
156                 kfree(sdev);
157                 dev_set_drvdata(dev, NULL);
158         }
159         return 0;
160 }
161
162 static struct device_driver scoop_driver = {
163         .name           = "sharp-scoop",
164         .bus            = &platform_bus_type,
165         .probe          = scoop_probe,
166         .remove         = scoop_remove,
167         .suspend        = scoop_suspend,
168         .resume         = scoop_resume,
169 };
170
171 int __init scoop_init(void)
172 {
173         return driver_register(&scoop_driver);
174 }
175
176 subsys_initcall(scoop_init);