[PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacks
[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 <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)
106 {
107         struct scoop_dev *sdev = dev_get_drvdata(dev);
108
109         check_scoop_reg(sdev);
110         sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
111         SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
112
113         return 0;
114 }
115
116 static int scoop_resume(struct device *dev)
117 {
118         struct scoop_dev *sdev = dev_get_drvdata(dev);
119
120         check_scoop_reg(sdev);
121         SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
122
123         return 0;
124 }
125 #else
126 #define scoop_suspend   NULL
127 #define scoop_resume    NULL
128 #endif
129
130 int __init scoop_probe(struct device *dev)
131 {
132         struct scoop_dev *devptr;
133         struct scoop_config *inf;
134         struct platform_device *pdev = to_platform_device(dev);
135         struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
136
137         if (!mem)
138                 return -EINVAL;
139
140         devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
141
142         if (!devptr)
143                 return  -ENOMEM;
144
145         memset(devptr, 0, sizeof(struct scoop_dev));
146         spin_lock_init(&devptr->scoop_lock);
147
148         inf = dev->platform_data;
149         devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
150
151         if (!devptr->base) {
152                 kfree(devptr);
153                 return -ENOMEM;
154         }
155
156         dev_set_drvdata(dev, devptr);
157
158         printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
159
160         SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
161         reset_scoop(dev);
162         SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
163         SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
164
165         devptr->suspend_clr = inf->suspend_clr;
166         devptr->suspend_set = inf->suspend_set;
167
168         return 0;
169 }
170
171 static int scoop_remove(struct device *dev)
172 {
173         struct scoop_dev *sdev = dev_get_drvdata(dev);
174         if (sdev) {
175                 iounmap(sdev->base);
176                 kfree(sdev);
177                 dev_set_drvdata(dev, NULL);
178         }
179         return 0;
180 }
181
182 static struct device_driver scoop_driver = {
183         .name           = "sharp-scoop",
184         .bus            = &platform_bus_type,
185         .probe          = scoop_probe,
186         .remove         = scoop_remove,
187         .suspend        = scoop_suspend,
188         .resume         = scoop_resume,
189 };
190
191 int __init scoop_init(void)
192 {
193         return driver_register(&scoop_driver);
194 }
195
196 subsys_initcall(scoop_init);