diff options
Diffstat (limited to 'drivers/rtc/rtc-ep93xx.c')
| -rw-r--r-- | drivers/rtc/rtc-ep93xx.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c new file mode 100644 index 000000000000..0dd80ea686a9 --- /dev/null +++ b/drivers/rtc/rtc-ep93xx.c @@ -0,0 +1,162 @@ +/* + * 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 <asm/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_set_time(struct device *dev, struct rtc_time *tm) +{ + int err; + unsigned long secs; + + err = rtc_tm_to_time(tm, &secs); + if (err != 0) + return err; + + return ep93xx_rtc_set_mmss(dev, secs); +} + +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, "24hr\t\t: yes\n"); + seq_printf(seq, "preload\t\t: %d\n", preload); + seq_printf(seq, "delete\t\t: %d\n", delete); + + return 0; +} + +static struct rtc_class_ops ep93xx_rtc_ops = { + .read_time = ep93xx_rtc_read_time, + .set_time = ep93xx_rtc_set_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)) { + dev_err(&dev->dev, "unable to register\n"); + 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; +} + +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); |