164 lines
3.7 KiB
C
164 lines
3.7 KiB
C
/*
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* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
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* Copyright (c) 2006 Tower Technologies
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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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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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <asm/hardware.h>
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#define EP93XX_RTC_REG(x) (EP93XX_RTC_BASE + (x))
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#define EP93XX_RTC_DATA EP93XX_RTC_REG(0x0000)
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#define EP93XX_RTC_LOAD EP93XX_RTC_REG(0x000C)
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#define EP93XX_RTC_SWCOMP EP93XX_RTC_REG(0x0108)
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#define DRV_VERSION "0.2"
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static int ep93xx_get_swcomp(struct device *dev, unsigned short *preload,
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unsigned short *delete)
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{
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unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP);
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if (preload)
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*preload = comp & 0xffff;
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if (delete)
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*delete = (comp >> 16) & 0x1f;
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return 0;
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}
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static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long time = __raw_readl(EP93XX_RTC_DATA);
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rtc_time_to_tm(time, tm);
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return 0;
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}
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static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
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{
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__raw_writel(secs + 1, EP93XX_RTC_LOAD);
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return 0;
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}
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static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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int err;
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unsigned long secs;
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err = rtc_tm_to_time(tm, &secs);
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if (err != 0)
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return err;
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return ep93xx_rtc_set_mmss(dev, secs);
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}
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static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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unsigned short preload, delete;
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ep93xx_get_swcomp(dev, &preload, &delete);
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seq_printf(seq, "preload\t\t: %d\n", preload);
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seq_printf(seq, "delete\t\t: %d\n", delete);
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return 0;
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}
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static const struct rtc_class_ops ep93xx_rtc_ops = {
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.read_time = ep93xx_rtc_read_time,
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.set_time = ep93xx_rtc_set_time,
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.set_mmss = ep93xx_rtc_set_mmss,
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.proc = ep93xx_rtc_proc,
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};
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static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short preload;
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ep93xx_get_swcomp(dev, &preload, NULL);
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return sprintf(buf, "%d\n", preload);
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}
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static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);
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static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short delete;
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ep93xx_get_swcomp(dev, NULL, &delete);
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return sprintf(buf, "%d\n", delete);
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}
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static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);
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static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
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{
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struct rtc_device *rtc = rtc_device_register("ep93xx",
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&dev->dev, &ep93xx_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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return PTR_ERR(rtc);
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}
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platform_set_drvdata(dev, rtc);
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device_create_file(&dev->dev, &dev_attr_comp_preload);
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device_create_file(&dev->dev, &dev_attr_comp_delete);
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return 0;
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}
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static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
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{
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struct rtc_device *rtc = platform_get_drvdata(dev);
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if (rtc)
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rtc_device_unregister(rtc);
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platform_set_drvdata(dev, NULL);
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return 0;
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}
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:ep93xx-rtc");
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static struct platform_driver ep93xx_rtc_platform_driver = {
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.driver = {
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.name = "ep93xx-rtc",
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.owner = THIS_MODULE,
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},
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.probe = ep93xx_rtc_probe,
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.remove = __devexit_p(ep93xx_rtc_remove),
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};
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static int __init ep93xx_rtc_init(void)
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{
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return platform_driver_register(&ep93xx_rtc_platform_driver);
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}
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static void __exit ep93xx_rtc_exit(void)
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{
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platform_driver_unregister(&ep93xx_rtc_platform_driver);
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}
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("EP93XX RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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module_init(ep93xx_rtc_init);
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module_exit(ep93xx_rtc_exit);
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