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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 | ||
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 | ||
77 | static 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 | ||
84 | static 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 | } | |
93 | static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL); | |
94 | ||
95 | static 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 | } | |
104 | static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL); | |
105 | ||
106 | ||
107 | static 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 | ||
125 | static 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 | ||
137 | static 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 | ||
146 | static int __init ep93xx_rtc_init(void) | |
147 | { | |
148 | return platform_driver_register(&ep93xx_rtc_platform_driver); | |
149 | } | |
150 | ||
151 | static void __exit ep93xx_rtc_exit(void) | |
152 | { | |
153 | platform_driver_unregister(&ep93xx_rtc_platform_driver); | |
154 | } | |
155 | ||
156 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
157 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
158 | MODULE_LICENSE("GPL"); | |
159 | MODULE_VERSION(DRV_VERSION); | |
160 | ||
161 | module_init(ep93xx_rtc_init); | |
162 | module_exit(ep93xx_rtc_exit); |