2 * Support code for the SCOOP interface found on various Sharp PDAs
4 * Copyright (c) 2004 Richard Purdie
6 * Based on code written by Sharp/Lineo for 2.4 kernels
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.
14 #include <linux/device.h>
16 #include <asm/hardware/scoop.h>
18 static void __iomem *scoop_io_base;
20 #define SCOOP_REG(adr) (*(volatile unsigned short*)(scoop_io_base+(adr)))
22 void reset_scoop(void)
24 SCOOP_REG(SCOOP_MCR) = 0x0100; // 00
25 SCOOP_REG(SCOOP_CDR) = 0x0000; // 04
26 SCOOP_REG(SCOOP_CPR) = 0x0000; // 0C
27 SCOOP_REG(SCOOP_CCR) = 0x0000; // 10
28 SCOOP_REG(SCOOP_IMR) = 0x0000; // 18
29 SCOOP_REG(SCOOP_IRM) = 0x00FF; // 14
30 SCOOP_REG(SCOOP_ISR) = 0x0000; // 1C
31 SCOOP_REG(SCOOP_IRM) = 0x0000;
34 static DEFINE_SPINLOCK(scoop_lock);
35 static u32 scoop_gpwr;
37 unsigned short set_scoop_gpio(unsigned short bit)
39 unsigned short gpio_bit;
42 spin_lock_irqsave(&scoop_lock, flag);
43 gpio_bit = SCOOP_REG(SCOOP_GPWR) | bit;
44 SCOOP_REG(SCOOP_GPWR) = gpio_bit;
45 spin_unlock_irqrestore(&scoop_lock, flag);
50 unsigned short reset_scoop_gpio(unsigned short bit)
52 unsigned short gpio_bit;
55 spin_lock_irqsave(&scoop_lock, flag);
56 gpio_bit = SCOOP_REG(SCOOP_GPWR) & ~bit;
57 SCOOP_REG(SCOOP_GPWR) = gpio_bit;
58 spin_unlock_irqrestore(&scoop_lock, flag);
63 EXPORT_SYMBOL(set_scoop_gpio);
64 EXPORT_SYMBOL(reset_scoop_gpio);
66 unsigned short read_scoop_reg(unsigned short reg)
68 return SCOOP_REG(reg);
71 void write_scoop_reg(unsigned short reg, unsigned short data)
76 EXPORT_SYMBOL(reset_scoop);
77 EXPORT_SYMBOL(read_scoop_reg);
78 EXPORT_SYMBOL(write_scoop_reg);
80 static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
82 if (level == SUSPEND_POWER_DOWN) {
83 scoop_gpwr = SCOOP_REG(SCOOP_GPWR);
84 SCOOP_REG(SCOOP_GPWR) = 0;
89 static int scoop_resume(struct device *dev, uint32_t level)
91 if (level == RESUME_POWER_ON) {
92 SCOOP_REG(SCOOP_GPWR) = scoop_gpwr;
97 int __init scoop_probe(struct device *dev)
99 struct scoop_config *inf;
100 struct platform_device *pdev = to_platform_device(dev);
101 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106 inf = dev->platform_data;
107 scoop_io_base = ioremap(mem->start, 0x1000);
111 SCOOP_REG(SCOOP_MCR) = 0x0140;
115 SCOOP_REG(SCOOP_GPCR) = inf->io_dir & 0xffff;
116 SCOOP_REG(SCOOP_GPWR) = inf->io_out & 0xffff;
121 static struct device_driver scoop_driver = {
122 .name = "sharp-scoop",
123 .bus = &platform_bus_type,
124 .probe = scoop_probe,
125 .suspend = scoop_suspend,
126 .resume = scoop_resume,
129 int __init scoop_init(void)
131 return driver_register(&scoop_driver);
134 subsys_initcall(scoop_init);