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12#include <linux/module.h>
13#include <linux/rtc.h>
14#include <linux/platform_device.h>
15#include <mach/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, "preload\t\t: %d\n", preload);
71 seq_printf(seq, "delete\t\t: %d\n", delete);
72
73 return 0;
74}
75
76static const struct rtc_class_ops ep93xx_rtc_ops = {
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
83static 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}
92static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);
93
94static 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}
103static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);
104
105
106static 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)) {
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
123static 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
136MODULE_ALIAS("platform:ep93xx-rtc");
137
138static struct platform_driver ep93xx_rtc_platform_driver = {
139 .driver = {
140 .name = "ep93xx-rtc",
141 .owner = THIS_MODULE,
142 },
143 .probe = ep93xx_rtc_probe,
144 .remove = __devexit_p(ep93xx_rtc_remove),
145};
146
147static int __init ep93xx_rtc_init(void)
148{
149 return platform_driver_register(&ep93xx_rtc_platform_driver);
150}
151
152static void __exit ep93xx_rtc_exit(void)
153{
154 platform_driver_unregister(&ep93xx_rtc_platform_driver);
155}
156
157MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
158MODULE_DESCRIPTION("EP93XX RTC driver");
159MODULE_LICENSE("GPL");
160MODULE_VERSION(DRV_VERSION);
161
162module_init(ep93xx_rtc_init);
163module_exit(ep93xx_rtc_exit);
164
