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path: root/drivers/rtc/rtc-ep93xx.c
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Diffstat (limited to 'drivers/rtc/rtc-ep93xx.c')
-rw-r--r--drivers/rtc/rtc-ep93xx.c162
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 @@
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
24static 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
38static 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
46static 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
52static 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
64static 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
70 seq_printf(seq, "24hr\t\t: yes\n");
71 seq_printf(seq, "preload\t\t: %d\n", preload);
72 seq_printf(seq, "delete\t\t: %d\n", delete);
73
74 return 0;
75}
76
77static struct rtc_class_ops ep93xx_rtc_ops = {
78 .read_time = ep93xx_rtc_read_time,
79 .set_time = ep93xx_rtc_set_time,
80 .set_mmss = ep93xx_rtc_set_mmss,
81 .proc = ep93xx_rtc_proc,
82};
83
84static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev,
85 struct device_attribute *attr, char *buf)
86{
87 unsigned short preload;
88
89 ep93xx_get_swcomp(dev, &preload, NULL);
90
91 return sprintf(buf, "%d\n", preload);
92}
93static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);
94
95static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 unsigned short delete;
99
100 ep93xx_get_swcomp(dev, NULL, &delete);
101
102 return sprintf(buf, "%d\n", delete);
103}
104static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);
105
106
107static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
108{
109 struct rtc_device *rtc = rtc_device_register("ep93xx",
110 &dev->dev, &ep93xx_rtc_ops, THIS_MODULE);
111
112 if (IS_ERR(rtc)) {
113 dev_err(&dev->dev, "unable to register\n");
114 return PTR_ERR(rtc);
115 }
116
117 platform_set_drvdata(dev, rtc);
118
119 device_create_file(&dev->dev, &dev_attr_comp_preload);
120 device_create_file(&dev->dev, &dev_attr_comp_delete);
121
122 return 0;
123}
124
125static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
126{
127 struct rtc_device *rtc = platform_get_drvdata(dev);
128
129 if (rtc)
130 rtc_device_unregister(rtc);
131
132 platform_set_drvdata(dev, NULL);
133
134 return 0;
135}
136
137static struct platform_driver ep93xx_rtc_platform_driver = {
138 .driver = {
139 .name = "ep93xx-rtc",
140 .owner = THIS_MODULE,
141 },
142 .probe = ep93xx_rtc_probe,
143 .remove = __devexit_p(ep93xx_rtc_remove),
144};
145
146static int __init ep93xx_rtc_init(void)
147{
148 return platform_driver_register(&ep93xx_rtc_platform_driver);
149}
150
151static void __exit ep93xx_rtc_exit(void)
152{
153 platform_driver_unregister(&ep93xx_rtc_platform_driver);
154}
155
156MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
157MODULE_DESCRIPTION("EP93XX RTC driver");
158MODULE_LICENSE("GPL");
159MODULE_VERSION(DRV_VERSION);
160
161module_init(ep93xx_rtc_init);
162module_exit(ep93xx_rtc_exit);