Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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 /* PCMCIA to Scoop linkage structures for pxa2xx_sharpsl.c
21    There is no easy way to link multiple scoop devices into one
22    single entity for the pxa2xx_pcmcia device */
23 int scoop_num;
24 struct scoop_pcmcia_dev *scoop_devs;
25
26 struct  scoop_dev {
27         void  *base;
28         spinlock_t scoop_lock;
29         unsigned short suspend_clr;
30         unsigned short suspend_set;
31         u32 scoop_gpwr;
32 };
33
34 void reset_scoop(struct device *dev)
35 {
36         struct scoop_dev *sdev = dev_get_drvdata(dev);
37
38         SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100;  // 00
39         SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000;  // 04
40         SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000;  // 0C
41         SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000;  // 10
42         SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000;  // 18
43         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF;  // 14
44         SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000;  // 1C
45         SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
46 }
47
48 unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
49 {
50         unsigned short gpio_bit;
51         unsigned long flag;
52         struct scoop_dev *sdev = dev_get_drvdata(dev);
53
54         spin_lock_irqsave(&sdev->scoop_lock, flag);
55         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
56         SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
57         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
58
59         return gpio_bit;
60 }
61
62 unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
63 {
64         unsigned short gpio_bit;
65         unsigned long flag;
66         struct scoop_dev *sdev = dev_get_drvdata(dev);
67
68         spin_lock_irqsave(&sdev->scoop_lock, flag);
69         gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
70         SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
71         spin_unlock_irqrestore(&sdev->scoop_lock, flag);
72
73         return gpio_bit;
74 }
75
76 EXPORT_SYMBOL(set_scoop_gpio);
77 EXPORT_SYMBOL(reset_scoop_gpio);
78
79 unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
80 {
81         struct scoop_dev *sdev = dev_get_drvdata(dev);
82         return SCOOP_REG(sdev->base,reg);
83 }
84
85 void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
86 {
87         struct scoop_dev *sdev = dev_get_drvdata(dev);
88         SCOOP_REG(sdev->base,reg)=data;
89 }
90
91 EXPORT_SYMBOL(reset_scoop);
92 EXPORT_SYMBOL(read_scoop_reg);
93 EXPORT_SYMBOL(write_scoop_reg);
94
95 static void check_scoop_reg(struct scoop_dev *sdev)
96 {
97         unsigned short mcr;
98
99         mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
100         if ((mcr & 0x100) == 0)
101                 SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
102 }
103
104 #ifdef CONFIG_PM
105 static int scoop_suspend(struct device *dev, pm_message_t state, uint32_t level)
106 {
107         if (level == SUSPEND_POWER_DOWN) {
108                 struct scoop_dev *sdev = dev_get_drvdata(dev);
109
110                 check_scoop_reg(sdev);
111                 sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
112                 SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
113         }
114         return 0;
115 }
116
117 static int scoop_resume(struct device *dev, uint32_t level)
118 {
119         if (level == RESUME_POWER_ON) {
120                 struct scoop_dev *sdev = dev_get_drvdata(dev);
121
122                 check_scoop_reg(sdev);
123                 SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
124         }
125         return 0;
126 }
127 #else
128 #define scoop_suspend   NULL
129 #define scoop_resume    NULL
130 #endif
131
132 int __init scoop_probe(struct device *dev)
133 {
134         struct scoop_dev *devptr;
135         struct scoop_config *inf;
136         struct platform_device *pdev = to_platform_device(dev);
137         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
138
139         if (!mem)
140                 return -EINVAL;
141
142         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
143
144         if (!devptr)
145                 return  -ENOMEM;
146
147         memset(devptr, 0, sizeof(struct scoop_dev));
148         spin_lock_init(&devptr->scoop_lock);
149
150         inf = dev->platform_data;
151         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
152
153         if (!devptr->base) {
154                 kfree(devptr);
155                 return -ENOMEM;
156         }
157
158         dev_set_drvdata(dev, devptr);
159
160         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
161
162         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
163         reset_scoop(dev);
164         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
165         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
166
167         devptr->suspend_clr = inf->suspend_clr;
168         devptr->suspend_set = inf->suspend_set;
169
170         return 0;
171 }
172
173 static int scoop_remove(struct device *dev)
174 {
175         struct scoop_dev *sdev = dev_get_drvdata(dev);
176         if (sdev) {
177                 iounmap(sdev->base);
178                 kfree(sdev);
179                 dev_set_drvdata(dev, NULL);
180         }
181         return 0;
182 }
183
184 static struct device_driver scoop_driver = {
185         .name           = "sharp-scoop",
186         .bus            = &platform_bus_type,
187         .probe          = scoop_probe,
188         .remove         = scoop_remove,
189         .suspend        = scoop_suspend,
190         .resume         = scoop_resume,
191 };
192
193 int __init scoop_init(void)
194 {
195         return driver_register(&scoop_driver);
196 }
197
198 subsys_initcall(scoop_init);