1*fd507e2fSAlessandro Zummo /* 2*fd507e2fSAlessandro Zummo * A driver for the RTC embedded in the Cirrus Logic EP93XX processors 3*fd507e2fSAlessandro Zummo * Copyright (c) 2006 Tower Technologies 4*fd507e2fSAlessandro Zummo * 5*fd507e2fSAlessandro Zummo * Author: Alessandro Zummo <a.zummo@towertech.it> 6*fd507e2fSAlessandro Zummo * 7*fd507e2fSAlessandro Zummo * This program is free software; you can redistribute it and/or modify 8*fd507e2fSAlessandro Zummo * it under the terms of the GNU General Public License version 2 as 9*fd507e2fSAlessandro Zummo * published by the Free Software Foundation. 10*fd507e2fSAlessandro Zummo */ 11*fd507e2fSAlessandro Zummo 12*fd507e2fSAlessandro Zummo #include <linux/module.h> 13*fd507e2fSAlessandro Zummo #include <linux/rtc.h> 14*fd507e2fSAlessandro Zummo #include <linux/platform_device.h> 15*fd507e2fSAlessandro Zummo #include <asm/hardware.h> 16*fd507e2fSAlessandro Zummo 17*fd507e2fSAlessandro Zummo #define EP93XX_RTC_REG(x) (EP93XX_RTC_BASE + (x)) 18*fd507e2fSAlessandro Zummo #define EP93XX_RTC_DATA EP93XX_RTC_REG(0x0000) 19*fd507e2fSAlessandro Zummo #define EP93XX_RTC_LOAD EP93XX_RTC_REG(0x000C) 20*fd507e2fSAlessandro Zummo #define EP93XX_RTC_SWCOMP EP93XX_RTC_REG(0x0108) 21*fd507e2fSAlessandro Zummo 22*fd507e2fSAlessandro Zummo #define DRV_VERSION "0.2" 23*fd507e2fSAlessandro Zummo 24*fd507e2fSAlessandro Zummo static int ep93xx_get_swcomp(struct device *dev, unsigned short *preload, 25*fd507e2fSAlessandro Zummo unsigned short *delete) 26*fd507e2fSAlessandro Zummo { 27*fd507e2fSAlessandro Zummo unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP); 28*fd507e2fSAlessandro Zummo 29*fd507e2fSAlessandro Zummo if (preload) 30*fd507e2fSAlessandro Zummo *preload = comp & 0xffff; 31*fd507e2fSAlessandro Zummo 32*fd507e2fSAlessandro Zummo if (delete) 33*fd507e2fSAlessandro Zummo *delete = (comp >> 16) & 0x1f; 34*fd507e2fSAlessandro Zummo 35*fd507e2fSAlessandro Zummo return 0; 36*fd507e2fSAlessandro Zummo } 37*fd507e2fSAlessandro Zummo 38*fd507e2fSAlessandro Zummo static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) 39*fd507e2fSAlessandro Zummo { 40*fd507e2fSAlessandro Zummo unsigned long time = __raw_readl(EP93XX_RTC_DATA); 41*fd507e2fSAlessandro Zummo 42*fd507e2fSAlessandro Zummo rtc_time_to_tm(time, tm); 43*fd507e2fSAlessandro Zummo return 0; 44*fd507e2fSAlessandro Zummo } 45*fd507e2fSAlessandro Zummo 46*fd507e2fSAlessandro Zummo static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) 47*fd507e2fSAlessandro Zummo { 48*fd507e2fSAlessandro Zummo __raw_writel(secs + 1, EP93XX_RTC_LOAD); 49*fd507e2fSAlessandro Zummo return 0; 50*fd507e2fSAlessandro Zummo } 51*fd507e2fSAlessandro Zummo 52*fd507e2fSAlessandro Zummo static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) 53*fd507e2fSAlessandro Zummo { 54*fd507e2fSAlessandro Zummo int err; 55*fd507e2fSAlessandro Zummo unsigned long secs; 56*fd507e2fSAlessandro Zummo 57*fd507e2fSAlessandro Zummo err = rtc_tm_to_time(tm, &secs); 58*fd507e2fSAlessandro Zummo if (err != 0) 59*fd507e2fSAlessandro Zummo return err; 60*fd507e2fSAlessandro Zummo 61*fd507e2fSAlessandro Zummo return ep93xx_rtc_set_mmss(dev, secs); 62*fd507e2fSAlessandro Zummo } 63*fd507e2fSAlessandro Zummo 64*fd507e2fSAlessandro Zummo static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) 65*fd507e2fSAlessandro Zummo { 66*fd507e2fSAlessandro Zummo unsigned short preload, delete; 67*fd507e2fSAlessandro Zummo 68*fd507e2fSAlessandro Zummo ep93xx_get_swcomp(dev, &preload, &delete); 69*fd507e2fSAlessandro Zummo 70*fd507e2fSAlessandro Zummo seq_printf(seq, "24hr\t\t: yes\n"); 71*fd507e2fSAlessandro Zummo seq_printf(seq, "preload\t\t: %d\n", preload); 72*fd507e2fSAlessandro Zummo seq_printf(seq, "delete\t\t: %d\n", delete); 73*fd507e2fSAlessandro Zummo 74*fd507e2fSAlessandro Zummo return 0; 75*fd507e2fSAlessandro Zummo } 76*fd507e2fSAlessandro Zummo 77*fd507e2fSAlessandro Zummo static struct rtc_class_ops ep93xx_rtc_ops = { 78*fd507e2fSAlessandro Zummo .read_time = ep93xx_rtc_read_time, 79*fd507e2fSAlessandro Zummo .set_time = ep93xx_rtc_set_time, 80*fd507e2fSAlessandro Zummo .set_mmss = ep93xx_rtc_set_mmss, 81*fd507e2fSAlessandro Zummo .proc = ep93xx_rtc_proc, 82*fd507e2fSAlessandro Zummo }; 83*fd507e2fSAlessandro Zummo 84*fd507e2fSAlessandro Zummo static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev, 85*fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 86*fd507e2fSAlessandro Zummo { 87*fd507e2fSAlessandro Zummo unsigned short preload; 88*fd507e2fSAlessandro Zummo 89*fd507e2fSAlessandro Zummo ep93xx_get_swcomp(dev, &preload, NULL); 90*fd507e2fSAlessandro Zummo 91*fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 92*fd507e2fSAlessandro Zummo } 93*fd507e2fSAlessandro Zummo static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL); 94*fd507e2fSAlessandro Zummo 95*fd507e2fSAlessandro Zummo static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev, 96*fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 97*fd507e2fSAlessandro Zummo { 98*fd507e2fSAlessandro Zummo unsigned short delete; 99*fd507e2fSAlessandro Zummo 100*fd507e2fSAlessandro Zummo ep93xx_get_swcomp(dev, NULL, &delete); 101*fd507e2fSAlessandro Zummo 102*fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 103*fd507e2fSAlessandro Zummo } 104*fd507e2fSAlessandro Zummo static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL); 105*fd507e2fSAlessandro Zummo 106*fd507e2fSAlessandro Zummo 107*fd507e2fSAlessandro Zummo static int __devinit ep93xx_rtc_probe(struct platform_device *dev) 108*fd507e2fSAlessandro Zummo { 109*fd507e2fSAlessandro Zummo struct rtc_device *rtc = rtc_device_register("ep93xx", 110*fd507e2fSAlessandro Zummo &dev->dev, &ep93xx_rtc_ops, THIS_MODULE); 111*fd507e2fSAlessandro Zummo 112*fd507e2fSAlessandro Zummo if (IS_ERR(rtc)) { 113*fd507e2fSAlessandro Zummo dev_err(&dev->dev, "unable to register\n"); 114*fd507e2fSAlessandro Zummo return PTR_ERR(rtc); 115*fd507e2fSAlessandro Zummo } 116*fd507e2fSAlessandro Zummo 117*fd507e2fSAlessandro Zummo platform_set_drvdata(dev, rtc); 118*fd507e2fSAlessandro Zummo 119*fd507e2fSAlessandro Zummo device_create_file(&dev->dev, &dev_attr_comp_preload); 120*fd507e2fSAlessandro Zummo device_create_file(&dev->dev, &dev_attr_comp_delete); 121*fd507e2fSAlessandro Zummo 122*fd507e2fSAlessandro Zummo return 0; 123*fd507e2fSAlessandro Zummo } 124*fd507e2fSAlessandro Zummo 125*fd507e2fSAlessandro Zummo static int __devexit ep93xx_rtc_remove(struct platform_device *dev) 126*fd507e2fSAlessandro Zummo { 127*fd507e2fSAlessandro Zummo struct rtc_device *rtc = platform_get_drvdata(dev); 128*fd507e2fSAlessandro Zummo 129*fd507e2fSAlessandro Zummo if (rtc) 130*fd507e2fSAlessandro Zummo rtc_device_unregister(rtc); 131*fd507e2fSAlessandro Zummo 132*fd507e2fSAlessandro Zummo platform_set_drvdata(dev, NULL); 133*fd507e2fSAlessandro Zummo 134*fd507e2fSAlessandro Zummo return 0; 135*fd507e2fSAlessandro Zummo } 136*fd507e2fSAlessandro Zummo 137*fd507e2fSAlessandro Zummo static struct platform_driver ep93xx_rtc_platform_driver = { 138*fd507e2fSAlessandro Zummo .driver = { 139*fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 140*fd507e2fSAlessandro Zummo .owner = THIS_MODULE, 141*fd507e2fSAlessandro Zummo }, 142*fd507e2fSAlessandro Zummo .probe = ep93xx_rtc_probe, 143*fd507e2fSAlessandro Zummo .remove = __devexit_p(ep93xx_rtc_remove), 144*fd507e2fSAlessandro Zummo }; 145*fd507e2fSAlessandro Zummo 146*fd507e2fSAlessandro Zummo static int __init ep93xx_rtc_init(void) 147*fd507e2fSAlessandro Zummo { 148*fd507e2fSAlessandro Zummo return platform_driver_register(&ep93xx_rtc_platform_driver); 149*fd507e2fSAlessandro Zummo } 150*fd507e2fSAlessandro Zummo 151*fd507e2fSAlessandro Zummo static void __exit ep93xx_rtc_exit(void) 152*fd507e2fSAlessandro Zummo { 153*fd507e2fSAlessandro Zummo platform_driver_unregister(&ep93xx_rtc_platform_driver); 154*fd507e2fSAlessandro Zummo } 155*fd507e2fSAlessandro Zummo 156*fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 157*fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 158*fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 159*fd507e2fSAlessandro Zummo MODULE_VERSION(DRV_VERSION); 160*fd507e2fSAlessandro Zummo 161*fd507e2fSAlessandro Zummo module_init(ep93xx_rtc_init); 162*fd507e2fSAlessandro Zummo module_exit(ep93xx_rtc_exit); 163