[ARM] Convert kmalloc+memset to kzalloc
[linux-2.6.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 <linux/string.h>
16 #include <linux/slab.h>
17 #include <linux/platform_device.h>
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;
26         unsigned short suspend_clr;
27         unsigned short suspend_set;
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
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
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
100 #ifdef CONFIG_PM
101 static int scoop_suspend(struct platform_device *dev, pm_message_t state)
102 {
103         struct scoop_dev *sdev = platform_get_drvdata(dev);
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;
108
109         return 0;
110 }
111
112 static int scoop_resume(struct platform_device *dev)
113 {
114         struct scoop_dev *sdev = platform_get_drvdata(dev);
115
116         check_scoop_reg(sdev);
117         SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
118
119         return 0;
120 }
121 #else
122 #define scoop_suspend   NULL
123 #define scoop_resume    NULL
124 #endif
125
126 int __init scoop_probe(struct platform_device *pdev)
127 {
128         struct scoop_dev *devptr;
129         struct scoop_config *inf;
130         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
131
132         if (!mem)
133                 return -EINVAL;
134
135         devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
136         if (!devptr)
137                 return -ENOMEM;
138
139         spin_lock_init(&devptr->scoop_lock);
140
141         inf = pdev->dev.platform_data;
142         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
143
144         if (!devptr->base) {
145                 kfree(devptr);
146                 return -ENOMEM;
147         }
148
149         platform_set_drvdata(pdev, devptr);
150
151         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
152
153         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
154         reset_scoop(&pdev->dev);
155         SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
156         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
157         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
158
159         devptr->suspend_clr = inf->suspend_clr;
160         devptr->suspend_set = inf->suspend_set;
161
162         return 0;
163 }
164
165 static int scoop_remove(struct platform_device *pdev)
166 {
167         struct scoop_dev *sdev = platform_get_drvdata(pdev);
168         if (sdev) {
169                 iounmap(sdev->base);
170                 kfree(sdev);
171                 platform_set_drvdata(pdev, NULL);
172         }
173         return 0;
174 }
175
176 static struct platform_driver scoop_driver = {
177         .probe          = scoop_probe,
178         .remove         = scoop_remove,
179         .suspend        = scoop_suspend,
180         .resume         = scoop_resume,
181         .driver         = {
182                 .name   = "sharp-scoop",
183         },
184 };
185
186 int __init scoop_init(void)
187 {
188         return platform_driver_register(&scoop_driver);
189 }
190
191 subsys_initcall(scoop_init);