diff options
Diffstat (limited to 'arch/arm/common/scoop.c')
| -rw-r--r-- | arch/arm/common/scoop.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/arm/common/scoop.c b/arch/arm/common/scoop.c new file mode 100644 index 000000000000..cfd0d3e550d9 --- /dev/null +++ b/arch/arm/common/scoop.c @@ -0,0 +1,176 @@ +/* + * Support code for the SCOOP interface found on various Sharp PDAs + * + * Copyright (c) 2004 Richard Purdie + * + * Based on code written by Sharp/Lineo for 2.4 kernels + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/device.h> +#include <asm/io.h> +#include <asm/hardware/scoop.h> + +#define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr))) + +struct scoop_dev { + void *base; + spinlock_t scoop_lock; + u32 scoop_gpwr; +}; + +void reset_scoop(struct device *dev) +{ + struct scoop_dev *sdev = dev_get_drvdata(dev); + + SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00 + SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04 + SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000; // 0C + SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10 + SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18 + SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14 + SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C + SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000; +} + +unsigned short set_scoop_gpio(struct device *dev, unsigned short bit) +{ + unsigned short gpio_bit; + unsigned long flag; + struct scoop_dev *sdev = dev_get_drvdata(dev); + + spin_lock_irqsave(&sdev->scoop_lock, flag); + gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit; + SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit; + spin_unlock_irqrestore(&sdev->scoop_lock, flag); + + return gpio_bit; +} + +unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit) +{ + unsigned short gpio_bit; + unsigned long flag; + struct scoop_dev *sdev = dev_get_drvdata(dev); + + spin_lock_irqsave(&sdev->scoop_lock, flag); + gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit; + SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit; + spin_unlock_irqrestore(&sdev->scoop_lock, flag); + + return gpio_bit; +} + +EXPORT_SYMBOL(set_scoop_gpio); +EXPORT_SYMBOL(reset_scoop_gpio); + +unsigned short read_scoop_reg(struct device *dev, unsigned short reg) +{ + struct scoop_dev *sdev = dev_get_drvdata(dev); + return SCOOP_REG(sdev->base,reg); +} + +void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data) +{ + struct scoop_dev *sdev = dev_get_drvdata(dev); + SCOOP_REG(sdev->base,reg)=data; +} + +EXPORT_SYMBOL(reset_scoop); +EXPORT_SYMBOL(read_scoop_reg); +EXPORT_SYMBOL(write_scoop_reg); + +#ifdef CONFIG_PM +static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level) +{ + if (level == SUSPEND_POWER_DOWN) { + struct scoop_dev *sdev = dev_get_drvdata(dev); + + sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR); + SCOOP_REG(sdev->base,SCOOP_GPWR) = 0; + } + return 0; +} + +static int scoop_resume(struct device *dev, uint32_t level) +{ + if (level == RESUME_POWER_ON) { + struct scoop_dev *sdev = dev_get_drvdata(dev); + + SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr; + } + return 0; +} +#else +#define scoop_suspend NULL +#define scoop_resume NULL +#endif + +int __init scoop_probe(struct device *dev) +{ + struct scoop_dev *devptr; + struct scoop_config *inf; + struct platform_device *pdev = to_platform_device(dev); + struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!mem) + return -EINVAL; + + devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL); + + if (!devptr) + return -ENOMEM; + + memset(devptr, 0, sizeof(struct scoop_dev)); + spin_lock_init(&devptr->scoop_lock); + + inf = dev->platform_data; + devptr->base = ioremap(mem->start, mem->end - mem->start + 1); + + if (!devptr->base) { + kfree(devptr); + return -ENOMEM; + } + + dev_set_drvdata(dev, devptr); + + printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base); + + SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140; + reset_scoop(dev); + SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff; + SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff; + + return 0; +} + +static int scoop_remove(struct device *dev) +{ + struct scoop_dev *sdev = dev_get_drvdata(dev); + if (sdev) { + iounmap(sdev->base); + kfree(sdev); + dev_set_drvdata(dev, NULL); + } + return 0; +} + +static struct device_driver scoop_driver = { + .name = "sharp-scoop", + .bus = &platform_bus_type, + .probe = scoop_probe, + .remove = scoop_remove, + .suspend = scoop_suspend, + .resume = scoop_resume, +}; + +int __init scoop_init(void) +{ + return driver_register(&scoop_driver); +} + +subsys_initcall(scoop_init); |