/* * A driver for the RTC embedded in the Cirrus Logic EP93XX processors * Copyright (c) 2006 Tower Technologies * * Author: Alessandro Zummo <a.zummo@towertech.it> * * 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/module.h> #include <linux/rtc.h> #include <linux/platform_device.h> #include <mach/hardware.h> #define EP93XX_RTC_REG(x) (EP93XX_RTC_BASE + (x)) #define EP93XX_RTC_DATA EP93XX_RTC_REG(0x0000) #define EP93XX_RTC_LOAD EP93XX_RTC_REG(0x000C) #define EP93XX_RTC_SWCOMP EP93XX_RTC_REG(0x0108) #define DRV_VERSION "0.2" static int ep93xx_get_swcomp(struct device *dev, unsigned short *preload, unsigned short *delete) { unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP); if (preload) *preload = comp & 0xffff; if (delete) *delete = (comp >> 16) & 0x1f; return 0; } static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) { unsigned long time = __raw_readl(EP93XX_RTC_DATA); rtc_time_to_tm(time, tm); return 0; } static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) { __raw_writel(secs + 1, EP93XX_RTC_LOAD); return 0; } static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) { unsigned short preload, delete; ep93xx_get_swcomp(dev, &preload, &delete); seq_printf(seq, "preload\t\t: %d\n", preload); seq_printf(seq, "delete\t\t: %d\n", delete); return 0; } static const struct rtc_class_ops ep93xx_rtc_ops = { .read_time = ep93xx_rtc_read_time, .set_mmss = ep93xx_rtc_set_mmss, .proc = ep93xx_rtc_proc, }; static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev, struct device_attribute *attr, char *buf) { unsigned short preload; ep93xx_get_swcomp(dev, &preload, NULL); return sprintf(buf, "%d\n", preload); } static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL); static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev, struct device_attribute *attr, char *buf) { unsigned short delete; ep93xx_get_swcomp(dev, NULL, &delete); return sprintf(buf, "%d\n", delete); } static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL); static int __devinit ep93xx_rtc_probe(struct platform_device *dev) { struct rtc_device *rtc = rtc_device_register("ep93xx", &dev->dev, &ep93xx_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) { return PTR_ERR(rtc); } platform_set_drvdata(dev, rtc); device_create_file(&dev->dev, &dev_attr_comp_preload); device_create_file(&dev->dev, &dev_attr_comp_delete); return 0; } static int __devexit ep93xx_rtc_remove(struct platform_device *dev) { struct rtc_device *rtc = platform_get_drvdata(dev); if (rtc) rtc_device_unregister(rtc); platform_set_drvdata(dev, NULL); return 0; } /* work with hotplug and coldplug */ MODULE_ALIAS("platform:ep93xx-rtc"); static struct platform_driver ep93xx_rtc_platform_driver = { .driver = { .name = "ep93xx-rtc", .owner = THIS_MODULE, }, .probe = ep93xx_rtc_probe, .remove = __devexit_p(ep93xx_rtc_remove), }; static int __init ep93xx_rtc_init(void) { return platform_driver_register(&ep93xx_rtc_platform_driver); } static void __exit ep93xx_rtc_exit(void) { platform_driver_unregister(&ep93xx_rtc_platform_driver); } MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); MODULE_DESCRIPTION("EP93XX RTC driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_VERSION); module_init(ep93xx_rtc_init); module_exit(ep93xx_rtc_exit);