forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/*
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* Support code for the SCOOP interface found on various Sharp PDAs
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*
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* Copyright (c) 2004 Richard Purdie
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*
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* Based on code written by Sharp/Lineo for 2.4 kernels
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/device.h>
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#include <asm/io.h>
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#include <asm/hardware/scoop.h>
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#define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
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struct scoop_dev {
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void *base;
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spinlock_t scoop_lock;
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u32 scoop_gpwr;
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};
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void reset_scoop(struct device *dev)
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{
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
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SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
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SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000; // 0C
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SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
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SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
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SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
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SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
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SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
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}
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unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
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{
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unsigned short gpio_bit;
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unsigned long flag;
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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spin_lock_irqsave(&sdev->scoop_lock, flag);
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gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
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SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
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spin_unlock_irqrestore(&sdev->scoop_lock, flag);
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return gpio_bit;
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}
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unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
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{
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unsigned short gpio_bit;
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unsigned long flag;
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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spin_lock_irqsave(&sdev->scoop_lock, flag);
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gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
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SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
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spin_unlock_irqrestore(&sdev->scoop_lock, flag);
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return gpio_bit;
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}
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EXPORT_SYMBOL(set_scoop_gpio);
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EXPORT_SYMBOL(reset_scoop_gpio);
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unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
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{
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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return SCOOP_REG(sdev->base,reg);
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}
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void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
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{
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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SCOOP_REG(sdev->base,reg)=data;
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}
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EXPORT_SYMBOL(reset_scoop);
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EXPORT_SYMBOL(read_scoop_reg);
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EXPORT_SYMBOL(write_scoop_reg);
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#ifdef CONFIG_PM
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static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
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{
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if (level == SUSPEND_POWER_DOWN) {
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
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SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
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}
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return 0;
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}
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static int scoop_resume(struct device *dev, uint32_t level)
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{
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if (level == RESUME_POWER_ON) {
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
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}
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return 0;
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}
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#else
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#define scoop_suspend NULL
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#define scoop_resume NULL
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#endif
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int __init scoop_probe(struct device *dev)
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{
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struct scoop_dev *devptr;
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struct scoop_config *inf;
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struct platform_device *pdev = to_platform_device(dev);
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struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem)
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return -EINVAL;
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devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
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if (!devptr)
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return -ENOMEM;
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memset(devptr, 0, sizeof(struct scoop_dev));
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spin_lock_init(&devptr->scoop_lock);
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inf = dev->platform_data;
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devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
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if (!devptr->base) {
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kfree(devptr);
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return -ENOMEM;
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}
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dev_set_drvdata(dev, devptr);
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printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
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SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
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reset_scoop(dev);
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SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
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SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
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return 0;
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}
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static int scoop_remove(struct device *dev)
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{
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struct scoop_dev *sdev = dev_get_drvdata(dev);
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if (sdev) {
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iounmap(sdev->base);
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kfree(sdev);
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dev_set_drvdata(dev, NULL);
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}
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return 0;
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}
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static struct device_driver scoop_driver = {
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.name = "sharp-scoop",
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.bus = &platform_bus_type,
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.probe = scoop_probe,
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.remove = scoop_remove,
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.suspend = scoop_suspend,
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.resume = scoop_resume,
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};
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int __init scoop_init(void)
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{
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return driver_register(&scoop_driver);
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}
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subsys_initcall(scoop_init);
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