Commit | Line | Data |
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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> | |
38f7b009 | 15 | #include <linux/io.h> |
5a0e3ad6 | 16 | #include <linux/gfp.h> |
38f7b009 HS |
17 | |
18 | #define EP93XX_RTC_DATA 0x000 | |
19 | #define EP93XX_RTC_MATCH 0x004 | |
20 | #define EP93XX_RTC_STATUS 0x008 | |
21 | #define EP93XX_RTC_STATUS_INTR (1<<0) | |
22 | #define EP93XX_RTC_LOAD 0x00C | |
23 | #define EP93XX_RTC_CONTROL 0x010 | |
24 | #define EP93XX_RTC_CONTROL_MIE (1<<0) | |
25 | #define EP93XX_RTC_SWCOMP 0x108 | |
26 | #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 | |
27 | #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 | |
28 | #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff | |
29 | #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 | |
30 | ||
38f7b009 HS |
31 | /* |
32 | * struct device dev.platform_data is used to store our private data | |
33 | * because struct rtc_device does not have a variable to hold it. | |
34 | */ | |
35 | struct ep93xx_rtc { | |
36 | void __iomem *mmio_base; | |
bf6ed027 | 37 | struct rtc_device *rtc; |
38f7b009 | 38 | }; |
fd507e2f | 39 | |
38f7b009 | 40 | static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, |
fd507e2f AZ |
41 | unsigned short *delete) |
42 | { | |
28dc5f80 | 43 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
44 | unsigned long comp; |
45 | ||
ff32ff17 | 46 | comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); |
fd507e2f AZ |
47 | |
48 | if (preload) | |
38f7b009 HS |
49 | *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) |
50 | >> EP93XX_RTC_SWCOMP_INT_SHIFT; | |
fd507e2f AZ |
51 | |
52 | if (delete) | |
38f7b009 HS |
53 | *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) |
54 | >> EP93XX_RTC_SWCOMP_DEL_SHIFT; | |
fd507e2f AZ |
55 | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
60 | { | |
28dc5f80 | 61 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
62 | unsigned long time; |
63 | ||
ff32ff17 | 64 | time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); |
fd507e2f AZ |
65 | |
66 | rtc_time_to_tm(time, tm); | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) | |
71 | { | |
28dc5f80 | 72 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 | 73 | |
ff32ff17 | 74 | writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); |
fd507e2f AZ |
75 | return 0; |
76 | } | |
77 | ||
fd507e2f AZ |
78 | static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) |
79 | { | |
80 | unsigned short preload, delete; | |
81 | ||
38f7b009 | 82 | ep93xx_rtc_get_swcomp(dev, &preload, &delete); |
fd507e2f | 83 | |
fd507e2f AZ |
84 | seq_printf(seq, "preload\t\t: %d\n", preload); |
85 | seq_printf(seq, "delete\t\t: %d\n", delete); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
ff8371ac | 90 | static const struct rtc_class_ops ep93xx_rtc_ops = { |
fd507e2f | 91 | .read_time = ep93xx_rtc_read_time, |
fd507e2f AZ |
92 | .set_mmss = ep93xx_rtc_set_mmss, |
93 | .proc = ep93xx_rtc_proc, | |
94 | }; | |
95 | ||
38f7b009 | 96 | static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, |
fd507e2f AZ |
97 | struct device_attribute *attr, char *buf) |
98 | { | |
99 | unsigned short preload; | |
100 | ||
38f7b009 | 101 | ep93xx_rtc_get_swcomp(dev, &preload, NULL); |
fd507e2f AZ |
102 | |
103 | return sprintf(buf, "%d\n", preload); | |
104 | } | |
38f7b009 | 105 | static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); |
fd507e2f | 106 | |
38f7b009 | 107 | static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, |
fd507e2f AZ |
108 | struct device_attribute *attr, char *buf) |
109 | { | |
110 | unsigned short delete; | |
111 | ||
38f7b009 | 112 | ep93xx_rtc_get_swcomp(dev, NULL, &delete); |
fd507e2f AZ |
113 | |
114 | return sprintf(buf, "%d\n", delete); | |
115 | } | |
38f7b009 | 116 | static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); |
fd507e2f | 117 | |
b4877d2b HS |
118 | static struct attribute *ep93xx_rtc_attrs[] = { |
119 | &dev_attr_comp_preload.attr, | |
120 | &dev_attr_comp_delete.attr, | |
121 | NULL | |
122 | }; | |
123 | ||
124 | static const struct attribute_group ep93xx_rtc_sysfs_files = { | |
125 | .attrs = ep93xx_rtc_attrs, | |
126 | }; | |
fd507e2f | 127 | |
5a167f45 | 128 | static int ep93xx_rtc_probe(struct platform_device *pdev) |
fd507e2f | 129 | { |
38f7b009 HS |
130 | struct ep93xx_rtc *ep93xx_rtc; |
131 | struct resource *res; | |
38f7b009 HS |
132 | int err; |
133 | ||
b4877d2b HS |
134 | ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); |
135 | if (!ep93xx_rtc) | |
38f7b009 HS |
136 | return -ENOMEM; |
137 | ||
138 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
7c1d69ee JL |
139 | ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res); |
140 | if (IS_ERR(ep93xx_rtc->mmio_base)) | |
141 | return PTR_ERR(ep93xx_rtc->mmio_base); | |
fd507e2f | 142 | |
38f7b009 | 143 | pdev->dev.platform_data = ep93xx_rtc; |
bf6ed027 | 144 | platform_set_drvdata(pdev, ep93xx_rtc); |
38f7b009 | 145 | |
5d65cbfb JH |
146 | ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev, |
147 | pdev->name, &ep93xx_rtc_ops, THIS_MODULE); | |
bf6ed027 AL |
148 | if (IS_ERR(ep93xx_rtc->rtc)) { |
149 | err = PTR_ERR(ep93xx_rtc->rtc); | |
b4877d2b | 150 | goto exit; |
fd507e2f AZ |
151 | } |
152 | ||
b4877d2b | 153 | err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); |
38f7b009 | 154 | if (err) |
5d65cbfb | 155 | goto exit; |
fd507e2f AZ |
156 | |
157 | return 0; | |
38f7b009 | 158 | |
b4877d2b HS |
159 | exit: |
160 | pdev->dev.platform_data = NULL; | |
38f7b009 | 161 | return err; |
fd507e2f AZ |
162 | } |
163 | ||
5a167f45 | 164 | static int ep93xx_rtc_remove(struct platform_device *pdev) |
fd507e2f | 165 | { |
b4877d2b | 166 | sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); |
38f7b009 | 167 | pdev->dev.platform_data = NULL; |
fd507e2f | 168 | |
fd507e2f AZ |
169 | return 0; |
170 | } | |
171 | ||
38f7b009 | 172 | static struct platform_driver ep93xx_rtc_driver = { |
fd507e2f AZ |
173 | .driver = { |
174 | .name = "ep93xx-rtc", | |
fd507e2f | 175 | }, |
84d56b38 | 176 | .probe = ep93xx_rtc_probe, |
5a167f45 | 177 | .remove = ep93xx_rtc_remove, |
fd507e2f AZ |
178 | }; |
179 | ||
84d56b38 | 180 | module_platform_driver(ep93xx_rtc_driver); |
fd507e2f AZ |
181 | |
182 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
183 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
184 | MODULE_LICENSE("GPL"); | |
84d56b38 | 185 | MODULE_ALIAS("platform:ep93xx-rtc"); |