Commit | Line | Data |
---|---|---|
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 | ||
31 | #define DRV_VERSION "0.3" | |
fd507e2f | 32 | |
38f7b009 HS |
33 | /* |
34 | * struct device dev.platform_data is used to store our private data | |
35 | * because struct rtc_device does not have a variable to hold it. | |
36 | */ | |
37 | struct ep93xx_rtc { | |
38 | void __iomem *mmio_base; | |
bf6ed027 | 39 | struct rtc_device *rtc; |
38f7b009 | 40 | }; |
fd507e2f | 41 | |
38f7b009 | 42 | static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, |
fd507e2f AZ |
43 | unsigned short *delete) |
44 | { | |
28dc5f80 | 45 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
46 | unsigned long comp; |
47 | ||
48 | comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); | |
fd507e2f AZ |
49 | |
50 | if (preload) | |
38f7b009 HS |
51 | *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) |
52 | >> EP93XX_RTC_SWCOMP_INT_SHIFT; | |
fd507e2f AZ |
53 | |
54 | if (delete) | |
38f7b009 HS |
55 | *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) |
56 | >> EP93XX_RTC_SWCOMP_DEL_SHIFT; | |
fd507e2f AZ |
57 | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
62 | { | |
28dc5f80 | 63 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
64 | unsigned long time; |
65 | ||
66 | time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); | |
fd507e2f AZ |
67 | |
68 | rtc_time_to_tm(time, tm); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) | |
73 | { | |
28dc5f80 | 74 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
75 | |
76 | __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); | |
fd507e2f AZ |
77 | return 0; |
78 | } | |
79 | ||
fd507e2f AZ |
80 | static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) |
81 | { | |
82 | unsigned short preload, delete; | |
83 | ||
38f7b009 | 84 | ep93xx_rtc_get_swcomp(dev, &preload, &delete); |
fd507e2f | 85 | |
fd507e2f AZ |
86 | seq_printf(seq, "preload\t\t: %d\n", preload); |
87 | seq_printf(seq, "delete\t\t: %d\n", delete); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
ff8371ac | 92 | static const struct rtc_class_ops ep93xx_rtc_ops = { |
fd507e2f | 93 | .read_time = ep93xx_rtc_read_time, |
fd507e2f AZ |
94 | .set_mmss = ep93xx_rtc_set_mmss, |
95 | .proc = ep93xx_rtc_proc, | |
96 | }; | |
97 | ||
38f7b009 | 98 | static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, |
fd507e2f AZ |
99 | struct device_attribute *attr, char *buf) |
100 | { | |
101 | unsigned short preload; | |
102 | ||
38f7b009 | 103 | ep93xx_rtc_get_swcomp(dev, &preload, NULL); |
fd507e2f AZ |
104 | |
105 | return sprintf(buf, "%d\n", preload); | |
106 | } | |
38f7b009 | 107 | static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); |
fd507e2f | 108 | |
38f7b009 | 109 | static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, |
fd507e2f AZ |
110 | struct device_attribute *attr, char *buf) |
111 | { | |
112 | unsigned short delete; | |
113 | ||
38f7b009 | 114 | ep93xx_rtc_get_swcomp(dev, NULL, &delete); |
fd507e2f AZ |
115 | |
116 | return sprintf(buf, "%d\n", delete); | |
117 | } | |
38f7b009 | 118 | static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); |
fd507e2f | 119 | |
b4877d2b HS |
120 | static struct attribute *ep93xx_rtc_attrs[] = { |
121 | &dev_attr_comp_preload.attr, | |
122 | &dev_attr_comp_delete.attr, | |
123 | NULL | |
124 | }; | |
125 | ||
126 | static const struct attribute_group ep93xx_rtc_sysfs_files = { | |
127 | .attrs = ep93xx_rtc_attrs, | |
128 | }; | |
fd507e2f | 129 | |
5a167f45 | 130 | static int ep93xx_rtc_probe(struct platform_device *pdev) |
fd507e2f | 131 | { |
38f7b009 HS |
132 | struct ep93xx_rtc *ep93xx_rtc; |
133 | struct resource *res; | |
38f7b009 HS |
134 | int err; |
135 | ||
b4877d2b HS |
136 | ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); |
137 | if (!ep93xx_rtc) | |
38f7b009 HS |
138 | return -ENOMEM; |
139 | ||
140 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
7c1d69ee JL |
141 | ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res); |
142 | if (IS_ERR(ep93xx_rtc->mmio_base)) | |
143 | return PTR_ERR(ep93xx_rtc->mmio_base); | |
fd507e2f | 144 | |
38f7b009 | 145 | pdev->dev.platform_data = ep93xx_rtc; |
bf6ed027 | 146 | platform_set_drvdata(pdev, ep93xx_rtc); |
38f7b009 | 147 | |
5d65cbfb JH |
148 | ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev, |
149 | pdev->name, &ep93xx_rtc_ops, THIS_MODULE); | |
bf6ed027 AL |
150 | if (IS_ERR(ep93xx_rtc->rtc)) { |
151 | err = PTR_ERR(ep93xx_rtc->rtc); | |
b4877d2b | 152 | goto exit; |
fd507e2f AZ |
153 | } |
154 | ||
b4877d2b | 155 | err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); |
38f7b009 | 156 | if (err) |
5d65cbfb | 157 | goto exit; |
fd507e2f AZ |
158 | |
159 | return 0; | |
38f7b009 | 160 | |
b4877d2b HS |
161 | exit: |
162 | pdev->dev.platform_data = NULL; | |
38f7b009 | 163 | return err; |
fd507e2f AZ |
164 | } |
165 | ||
5a167f45 | 166 | static int ep93xx_rtc_remove(struct platform_device *pdev) |
fd507e2f | 167 | { |
b4877d2b | 168 | sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); |
38f7b009 | 169 | pdev->dev.platform_data = NULL; |
fd507e2f | 170 | |
fd507e2f AZ |
171 | return 0; |
172 | } | |
173 | ||
38f7b009 | 174 | static struct platform_driver ep93xx_rtc_driver = { |
fd507e2f AZ |
175 | .driver = { |
176 | .name = "ep93xx-rtc", | |
fd507e2f | 177 | }, |
84d56b38 | 178 | .probe = ep93xx_rtc_probe, |
5a167f45 | 179 | .remove = ep93xx_rtc_remove, |
fd507e2f AZ |
180 | }; |
181 | ||
84d56b38 | 182 | module_platform_driver(ep93xx_rtc_driver); |
fd507e2f AZ |
183 | |
184 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
185 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
186 | MODULE_LICENSE("GPL"); | |
187 | MODULE_VERSION(DRV_VERSION); | |
84d56b38 | 188 | MODULE_ALIAS("platform:ep93xx-rtc"); |