projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| fd507e2f AZ |
1 | /* |
| 2 | * A driver for the RTC embedded in the Cirrus Logic EP93XX processors | |
| 3 | * Copyright (c) 2006 Tower Technologies | |
| 4 | * | |
| 5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/rtc.h> | |
| 14 | #include <linux/platform_device.h> | |
| 15 | #include <asm/hardware.h> | |
| 16 | ||
| 17 | #define EP93XX_RTC_REG(x) (EP93XX_RTC_BASE + (x)) | |
| 18 | #define EP93XX_RTC_DATA EP93XX_RTC_REG(0x0000) | |
| 19 | #define EP93XX_RTC_LOAD EP93XX_RTC_REG(0x000C) | |
| 20 | #define EP93XX_RTC_SWCOMP EP93XX_RTC_REG(0x0108) | |
| 21 | ||
| 22 | #define DRV_VERSION "0.2" | |
| 23 | ||
| 24 | static int ep93xx_get_swcomp(struct device *dev, unsigned short *preload, | |
| 25 | unsigned short *delete) | |
| 26 | { | |
| 27 | unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP); | |
| 28 | ||
| 29 | if (preload) | |
| 30 | *preload = comp & 0xffff; | |
| 31 | ||
| 32 | if (delete) | |
| 33 | *delete = (comp >> 16) & 0x1f; | |
| 34 | ||
| 35 | return 0; | |
| 36 | } | |
| 37 | ||
| 38 | static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
| 39 | { | |
| 40 | unsigned long time = __raw_readl(EP93XX_RTC_DATA); | |
| 41 | ||
| 42 | rtc_time_to_tm(time, tm); | |
| 43 | return 0; | |
| 44 | } | |
| 45 | ||
| 46 | static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) | |
| 47 | { | |
| 48 | __raw_writel(secs + 1, EP93XX_RTC_LOAD); | |
| 49 | return 0; | |
| 50 | } | |
| 51 | ||
| 52 | static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
| 53 | { | |
| 54 | int err; | |
| 55 | unsigned long secs; | |
| 56 | ||
| 57 | err = rtc_tm_to_time(tm, &secs); | |
| 58 | if (err != 0) | |
| 59 | return err; | |
| 60 | ||
| 61 | return ep93xx_rtc_set_mmss(dev, secs); | |
| 62 | } | |
| 63 | ||
| 64 | static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) | |
| 65 | { | |
| 66 | unsigned short preload, delete; | |
| 67 | ||
| 68 | ep93xx_get_swcomp(dev, &preload, &delete); | |
| 69 | ||
| fd507e2f AZ |
70 | seq_printf(seq, "preload\t\t: %d\n", preload); |
| 71 | seq_printf(seq, "delete\t\t: %d\n", delete); | |
| 72 | ||
| 73 | return 0; | |
| 74 | } | |
| 75 | ||
| ff8371ac | 76 | static const struct rtc_class_ops ep93xx_rtc_ops = { |
| fd507e2f AZ |
77 | .read_time = ep93xx_rtc_read_time, |
| 78 | .set_time = ep93xx_rtc_set_time, | |
| 79 | .set_mmss = ep93xx_rtc_set_mmss, | |
| 80 | .proc = ep93xx_rtc_proc, | |
| 81 | }; | |
| 82 | ||
| 83 | static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev, | |
| 84 | struct device_attribute *attr, char *buf) | |
| 85 | { | |
| 86 | unsigned short preload; | |
| 87 | ||
| 88 | ep93xx_get_swcomp(dev, &preload, NULL); | |
| 89 | ||
| 90 | return sprintf(buf, "%d\n", preload); | |
| 91 | } | |
| 92 | static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL); | |
| 93 | ||
| 94 | static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev, | |
| 95 | struct device_attribute *attr, char *buf) | |
| 96 | { | |
| 97 | unsigned short delete; | |
| 98 | ||
| 99 | ep93xx_get_swcomp(dev, NULL, &delete); | |
| 100 | ||
| 101 | return sprintf(buf, "%d\n", delete); | |
| 102 | } | |
| 103 | static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL); | |
| 104 | ||
| 105 | ||
| 106 | static int __devinit ep93xx_rtc_probe(struct platform_device *dev) | |
| 107 | { | |
| 108 | struct rtc_device *rtc = rtc_device_register("ep93xx", | |
| 109 | &dev->dev, &ep93xx_rtc_ops, THIS_MODULE); | |
| 110 | ||
| 111 | if (IS_ERR(rtc)) { | |
| fd507e2f AZ |
112 | return PTR_ERR(rtc); |
| 113 | } | |
| 114 | ||
| 115 | platform_set_drvdata(dev, rtc); | |
| 116 | ||
| 117 | device_create_file(&dev->dev, &dev_attr_comp_preload); | |
| 118 | device_create_file(&dev->dev, &dev_attr_comp_delete); | |
| 119 | ||
| 120 | return 0; | |
| 121 | } | |
| 122 | ||
| 123 | static int __devexit ep93xx_rtc_remove(struct platform_device *dev) | |
| 124 | { | |
| 125 | struct rtc_device *rtc = platform_get_drvdata(dev); | |
| 126 | ||
| 127 | if (rtc) | |
| 128 | rtc_device_unregister(rtc); | |
| 129 | ||
| 130 | platform_set_drvdata(dev, NULL); | |
| 131 | ||
| 132 | return 0; | |
| 133 | } | |
| 134 | ||
| 135 | static struct platform_driver ep93xx_rtc_platform_driver = { | |
| 136 | .driver = { | |
| 137 | .name = "ep93xx-rtc", | |
| 138 | .owner = THIS_MODULE, | |
| 139 | }, | |
| 140 | .probe = ep93xx_rtc_probe, | |
| 141 | .remove = __devexit_p(ep93xx_rtc_remove), | |
| 142 | }; | |
| 143 | ||
| 144 | static int __init ep93xx_rtc_init(void) | |
| 145 | { | |
| 146 | return platform_driver_register(&ep93xx_rtc_platform_driver); | |
| 147 | } | |
| 148 | ||
| 149 | static void __exit ep93xx_rtc_exit(void) | |
| 150 | { | |
| 151 | platform_driver_unregister(&ep93xx_rtc_platform_driver); | |
| 152 | } | |
| 153 | ||
| 154 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
| 155 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
| 156 | MODULE_LICENSE("GPL"); | |
| 157 | MODULE_VERSION(DRV_VERSION); | |
| 158 | ||
| 159 | module_init(ep93xx_rtc_init); | |
| 160 | module_exit(ep93xx_rtc_exit); |