tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/* PCMCIA to Scoop linkage
22
23 There is no easy way to link multiple scoop devices into one
24 single entity for the pxa2xx_pcmcia device so this structure
25 is used which is setup by the platform code.
26
27 This file is never modular so this symbol is always
28 accessile to the board support files.
29*/
30struct scoop_pcmcia_config *platform_scoop_config;
31EXPORT_SYMBOL(platform_scoop_config);
32
33#define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
34
35struct scoop_dev {
36 void *base;
37 spinlock_t scoop_lock;
38 unsigned short suspend_clr;
39 unsigned short suspend_set;
40 u32 scoop_gpwr;
41};
42
43void reset_scoop(struct device *dev)
44{
45 struct scoop_dev *sdev = dev_get_drvdata(dev);
46
47 SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
48 SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
49 SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
50 SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
51 SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
52 SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
53 SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
54}
55
56unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
57{
58 unsigned short gpio_bit;
59 unsigned long flag;
60 struct scoop_dev *sdev = dev_get_drvdata(dev);
61
62 spin_lock_irqsave(&sdev->scoop_lock, flag);
63 gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
64 SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
65 spin_unlock_irqrestore(&sdev->scoop_lock, flag);
66
67 return gpio_bit;
68}
69
70unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
71{
72 unsigned short gpio_bit;
73 unsigned long flag;
74 struct scoop_dev *sdev = dev_get_drvdata(dev);
75
76 spin_lock_irqsave(&sdev->scoop_lock, flag);
77 gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
78 SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
79 spin_unlock_irqrestore(&sdev->scoop_lock, flag);
80
81 return gpio_bit;
82}
83
84EXPORT_SYMBOL(set_scoop_gpio);
85EXPORT_SYMBOL(reset_scoop_gpio);
86
87unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
88{
89 struct scoop_dev *sdev = dev_get_drvdata(dev);
90 return SCOOP_REG(sdev->base,reg);
91}
92
93void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
94{
95 struct scoop_dev *sdev = dev_get_drvdata(dev);
96 SCOOP_REG(sdev->base,reg)=data;
97}
98
99EXPORT_SYMBOL(reset_scoop);
100EXPORT_SYMBOL(read_scoop_reg);
101EXPORT_SYMBOL(write_scoop_reg);
102
103static void check_scoop_reg(struct scoop_dev *sdev)
104{
105 unsigned short mcr;
106
107 mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
108 if ((mcr & 0x100) == 0)
109 SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
110}
111
112#ifdef CONFIG_PM
113static int scoop_suspend(struct platform_device *dev, pm_message_t state)
114{
115 struct scoop_dev *sdev = platform_get_drvdata(dev);
116
117 check_scoop_reg(sdev);
118 sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
119 SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
120
121 return 0;
122}
123
124static int scoop_resume(struct platform_device *dev)
125{
126 struct scoop_dev *sdev = platform_get_drvdata(dev);
127
128 check_scoop_reg(sdev);
129 SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
130
131 return 0;
132}
133#else
134#define scoop_suspend NULL
135#define scoop_resume NULL
136#endif
137
138int __init scoop_probe(struct platform_device *pdev)
139{
140 struct scoop_dev *devptr;
141 struct scoop_config *inf;
142 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143
144 if (!mem)
145 return -EINVAL;
146
147 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
148 if (!devptr)
149 return -ENOMEM;
150
151 spin_lock_init(&devptr->scoop_lock);
152
153 inf = pdev->dev.platform_data;
154 devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
155
156 if (!devptr->base) {
157 kfree(devptr);
158 return -ENOMEM;
159 }
160
161 platform_set_drvdata(pdev, devptr);
162
163 printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
164
165 SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
166 reset_scoop(&pdev->dev);
167 SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
168 SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
169 SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
170
171 devptr->suspend_clr = inf->suspend_clr;
172 devptr->suspend_set = inf->suspend_set;
173
174 return 0;
175}
176
177static int scoop_remove(struct platform_device *pdev)
178{
179 struct scoop_dev *sdev = platform_get_drvdata(pdev);
180 if (sdev) {
181 iounmap(sdev->base);
182 kfree(sdev);
183 platform_set_drvdata(pdev, NULL);
184 }
185 return 0;
186}
187
188static struct platform_driver scoop_driver = {
189 .probe = scoop_probe,
190 .remove = scoop_remove,
191 .suspend = scoop_suspend,
192 .resume = scoop_resume,
193 .driver = {
194 .name = "sharp-scoop",
195 },
196};
197
198int __init scoop_init(void)
199{
200 return platform_driver_register(&scoop_driver);
201}
202
203subsys_initcall(scoop_init);