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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> | |
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); |