/* * 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 <linux/string.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <asm/io.h> #include <asm/hardware/scoop.h> /* PCMCIA to Scoop linkage There is no easy way to link multiple scoop devices into one single entity for the pxa2xx_pcmcia device so this structure is used which is setup by the platform code. This file is never modular so this symbol is always accessile to the board support files. */ struct scoop_pcmcia_config *platform_scoop_config; EXPORT_SYMBOL(platform_scoop_config); #define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr))) struct scoop_dev { void *base; spinlock_t scoop_lock; unsigned short suspend_clr; unsigned short suspend_set; 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_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); static void check_scoop_reg(struct scoop_dev *sdev) { unsigned short mcr; mcr = SCOOP_REG(sdev->base, SCOOP_MCR); if ((mcr & 0x100) == 0) SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101; } #ifdef CONFIG_PM static int scoop_suspend(struct platform_device *dev, pm_message_t state) { struct scoop_dev *sdev = platform_get_drvdata(dev); check_scoop_reg(sdev); sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR); SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set; return 0; } static int scoop_resume(struct platform_device *dev) { struct scoop_dev *sdev = platform_get_drvdata(dev); check_scoop_reg(sdev); 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 platform_device *pdev) { struct scoop_dev *devptr; struct scoop_config *inf; struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) return -EINVAL; devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL); if (!devptr) return -ENOMEM; spin_lock_init(&devptr->scoop_lock); inf = pdev->dev.platform_data; devptr->base = ioremap(mem->start, mem->end - mem->start + 1); if (!devptr->base) { kfree(devptr); return -ENOMEM; } platform_set_drvdata(pdev, 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(&pdev->dev); SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000; SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff; SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff; devptr->suspend_clr = inf->suspend_clr; devptr->suspend_set = inf->suspend_set; return 0; } static int scoop_remove(struct platform_device *pdev) { struct scoop_dev *sdev = platform_get_drvdata(pdev); if (sdev) { iounmap(sdev->base); kfree(sdev); platform_set_drvdata(pdev, NULL); } return 0; } static struct platform_driver scoop_driver = { .probe = scoop_probe, .remove = scoop_remove, .suspend = scoop_suspend, .resume = scoop_resume, .driver = { .name = "sharp-scoop", }, }; int __init scoop_init(void) { return platform_driver_register(&scoop_driver); } subsys_initcall(scoop_init);