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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> | |
4e57b681 | 15 | #include <linux/string.h> |
de25968c | 16 | #include <linux/slab.h> |
d052d1be | 17 | #include <linux/platform_device.h> |
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 | ||
23 | struct scoop_dev { | |
24 | void *base; | |
25 | spinlock_t scoop_lock; | |
7c398988 RP |
26 | unsigned short suspend_clr; |
27 | unsigned short suspend_set; | |
1da177e4 LT |
28 | u32 scoop_gpwr; |
29 | }; | |
30 | ||
31 | void reset_scoop(struct device *dev) | |
32 | { | |
33 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
34 | ||
35 | SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00 | |
36 | SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04 | |
1da177e4 LT |
37 | SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10 |
38 | SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18 | |
39 | SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14 | |
40 | SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C | |
41 | SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000; | |
42 | } | |
43 | ||
44 | unsigned short set_scoop_gpio(struct device *dev, unsigned short bit) | |
45 | { | |
46 | unsigned short gpio_bit; | |
47 | unsigned long flag; | |
48 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
49 | ||
50 | spin_lock_irqsave(&sdev->scoop_lock, flag); | |
51 | gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit; | |
52 | SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit; | |
53 | spin_unlock_irqrestore(&sdev->scoop_lock, flag); | |
54 | ||
55 | return gpio_bit; | |
56 | } | |
57 | ||
58 | unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit) | |
59 | { | |
60 | unsigned short gpio_bit; | |
61 | unsigned long flag; | |
62 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
63 | ||
64 | spin_lock_irqsave(&sdev->scoop_lock, flag); | |
65 | gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit; | |
66 | SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit; | |
67 | spin_unlock_irqrestore(&sdev->scoop_lock, flag); | |
68 | ||
69 | return gpio_bit; | |
70 | } | |
71 | ||
72 | EXPORT_SYMBOL(set_scoop_gpio); | |
73 | EXPORT_SYMBOL(reset_scoop_gpio); | |
74 | ||
75 | unsigned short read_scoop_reg(struct device *dev, unsigned short reg) | |
76 | { | |
77 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
78 | return SCOOP_REG(sdev->base,reg); | |
79 | } | |
80 | ||
81 | void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data) | |
82 | { | |
83 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
84 | SCOOP_REG(sdev->base,reg)=data; | |
85 | } | |
86 | ||
87 | EXPORT_SYMBOL(reset_scoop); | |
88 | EXPORT_SYMBOL(read_scoop_reg); | |
89 | EXPORT_SYMBOL(write_scoop_reg); | |
90 | ||
7c398988 RP |
91 | static void check_scoop_reg(struct scoop_dev *sdev) |
92 | { | |
93 | unsigned short mcr; | |
94 | ||
95 | mcr = SCOOP_REG(sdev->base, SCOOP_MCR); | |
96 | if ((mcr & 0x100) == 0) | |
97 | SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101; | |
98 | } | |
99 | ||
1da177e4 | 100 | #ifdef CONFIG_PM |
3ae5eaec | 101 | static int scoop_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 102 | { |
3ae5eaec | 103 | struct scoop_dev *sdev = platform_get_drvdata(dev); |
9480e307 RK |
104 | |
105 | check_scoop_reg(sdev); | |
106 | sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR); | |
107 | SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set; | |
1da177e4 | 108 | |
1da177e4 LT |
109 | return 0; |
110 | } | |
111 | ||
3ae5eaec | 112 | static int scoop_resume(struct platform_device *dev) |
1da177e4 | 113 | { |
3ae5eaec | 114 | struct scoop_dev *sdev = platform_get_drvdata(dev); |
9480e307 RK |
115 | |
116 | check_scoop_reg(sdev); | |
117 | SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr; | |
1da177e4 | 118 | |
1da177e4 LT |
119 | return 0; |
120 | } | |
121 | #else | |
122 | #define scoop_suspend NULL | |
123 | #define scoop_resume NULL | |
124 | #endif | |
125 | ||
3ae5eaec | 126 | int __init scoop_probe(struct platform_device *pdev) |
1da177e4 LT |
127 | { |
128 | struct scoop_dev *devptr; | |
129 | struct scoop_config *inf; | |
1da177e4 LT |
130 | struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
131 | ||
132 | if (!mem) | |
133 | return -EINVAL; | |
134 | ||
135 | devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL); | |
136 | ||
137 | if (!devptr) | |
138 | return -ENOMEM; | |
139 | ||
140 | memset(devptr, 0, sizeof(struct scoop_dev)); | |
141 | spin_lock_init(&devptr->scoop_lock); | |
142 | ||
3ae5eaec | 143 | inf = pdev->dev.platform_data; |
1da177e4 LT |
144 | devptr->base = ioremap(mem->start, mem->end - mem->start + 1); |
145 | ||
146 | if (!devptr->base) { | |
147 | kfree(devptr); | |
148 | return -ENOMEM; | |
149 | } | |
150 | ||
3ae5eaec | 151 | platform_set_drvdata(pdev, devptr); |
1da177e4 LT |
152 | |
153 | printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base); | |
154 | ||
155 | SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140; | |
c35bf4a5 | 156 | reset_scoop(&pdev->dev); |
945b9579 | 157 | SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000; |
1da177e4 LT |
158 | SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff; |
159 | SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff; | |
160 | ||
7c398988 RP |
161 | devptr->suspend_clr = inf->suspend_clr; |
162 | devptr->suspend_set = inf->suspend_set; | |
163 | ||
1da177e4 LT |
164 | return 0; |
165 | } | |
166 | ||
3ae5eaec | 167 | static int scoop_remove(struct platform_device *pdev) |
1da177e4 | 168 | { |
3ae5eaec | 169 | struct scoop_dev *sdev = platform_get_drvdata(pdev); |
1da177e4 LT |
170 | if (sdev) { |
171 | iounmap(sdev->base); | |
172 | kfree(sdev); | |
3ae5eaec | 173 | platform_set_drvdata(pdev, NULL); |
1da177e4 LT |
174 | } |
175 | return 0; | |
176 | } | |
177 | ||
3ae5eaec | 178 | static struct platform_driver scoop_driver = { |
1da177e4 LT |
179 | .probe = scoop_probe, |
180 | .remove = scoop_remove, | |
181 | .suspend = scoop_suspend, | |
182 | .resume = scoop_resume, | |
3ae5eaec RK |
183 | .driver = { |
184 | .name = "sharp-scoop", | |
185 | }, | |
1da177e4 LT |
186 | }; |
187 | ||
188 | int __init scoop_init(void) | |
189 | { | |
3ae5eaec | 190 | return platform_driver_register(&scoop_driver); |
1da177e4 LT |
191 | } |
192 | ||
193 | subsys_initcall(scoop_init); |