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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> | |
a09e64fb | 15 | #include <mach/hardware.h> |
fd507e2f AZ |
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 | ||
fd507e2f AZ |
52 | static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) |
53 | { | |
54 | unsigned short preload, delete; | |
55 | ||
56 | ep93xx_get_swcomp(dev, &preload, &delete); | |
57 | ||
fd507e2f AZ |
58 | seq_printf(seq, "preload\t\t: %d\n", preload); |
59 | seq_printf(seq, "delete\t\t: %d\n", delete); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
ff8371ac | 64 | static const struct rtc_class_ops ep93xx_rtc_ops = { |
fd507e2f | 65 | .read_time = ep93xx_rtc_read_time, |
fd507e2f AZ |
66 | .set_mmss = ep93xx_rtc_set_mmss, |
67 | .proc = ep93xx_rtc_proc, | |
68 | }; | |
69 | ||
70 | static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev, | |
71 | struct device_attribute *attr, char *buf) | |
72 | { | |
73 | unsigned short preload; | |
74 | ||
75 | ep93xx_get_swcomp(dev, &preload, NULL); | |
76 | ||
77 | return sprintf(buf, "%d\n", preload); | |
78 | } | |
79 | static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL); | |
80 | ||
81 | static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev, | |
82 | struct device_attribute *attr, char *buf) | |
83 | { | |
84 | unsigned short delete; | |
85 | ||
86 | ep93xx_get_swcomp(dev, NULL, &delete); | |
87 | ||
88 | return sprintf(buf, "%d\n", delete); | |
89 | } | |
90 | static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL); | |
91 | ||
92 | ||
93 | static int __devinit ep93xx_rtc_probe(struct platform_device *dev) | |
94 | { | |
95 | struct rtc_device *rtc = rtc_device_register("ep93xx", | |
96 | &dev->dev, &ep93xx_rtc_ops, THIS_MODULE); | |
97 | ||
98 | if (IS_ERR(rtc)) { | |
fd507e2f AZ |
99 | return PTR_ERR(rtc); |
100 | } | |
101 | ||
102 | platform_set_drvdata(dev, rtc); | |
103 | ||
104 | device_create_file(&dev->dev, &dev_attr_comp_preload); | |
105 | device_create_file(&dev->dev, &dev_attr_comp_delete); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int __devexit ep93xx_rtc_remove(struct platform_device *dev) | |
111 | { | |
112 | struct rtc_device *rtc = platform_get_drvdata(dev); | |
113 | ||
114 | if (rtc) | |
115 | rtc_device_unregister(rtc); | |
116 | ||
117 | platform_set_drvdata(dev, NULL); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
ad28a07b KS |
122 | /* work with hotplug and coldplug */ |
123 | MODULE_ALIAS("platform:ep93xx-rtc"); | |
124 | ||
fd507e2f AZ |
125 | static struct platform_driver ep93xx_rtc_platform_driver = { |
126 | .driver = { | |
127 | .name = "ep93xx-rtc", | |
128 | .owner = THIS_MODULE, | |
129 | }, | |
130 | .probe = ep93xx_rtc_probe, | |
131 | .remove = __devexit_p(ep93xx_rtc_remove), | |
132 | }; | |
133 | ||
134 | static int __init ep93xx_rtc_init(void) | |
135 | { | |
136 | return platform_driver_register(&ep93xx_rtc_platform_driver); | |
137 | } | |
138 | ||
139 | static void __exit ep93xx_rtc_exit(void) | |
140 | { | |
141 | platform_driver_unregister(&ep93xx_rtc_platform_driver); | |
142 | } | |
143 | ||
144 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
145 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
146 | MODULE_LICENSE("GPL"); | |
147 | MODULE_VERSION(DRV_VERSION); | |
148 | ||
149 | module_init(ep93xx_rtc_init); | |
150 | module_exit(ep93xx_rtc_exit); |