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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 | ||
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; | |
39 | }; | |
fd507e2f | 40 | |
38f7b009 | 41 | static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, |
fd507e2f AZ |
42 | unsigned short *delete) |
43 | { | |
38f7b009 HS |
44 | struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; |
45 | unsigned long comp; | |
46 | ||
47 | comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); | |
fd507e2f AZ |
48 | |
49 | if (preload) | |
38f7b009 HS |
50 | *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) |
51 | >> EP93XX_RTC_SWCOMP_INT_SHIFT; | |
fd507e2f AZ |
52 | |
53 | if (delete) | |
38f7b009 HS |
54 | *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) |
55 | >> EP93XX_RTC_SWCOMP_DEL_SHIFT; | |
fd507e2f AZ |
56 | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
61 | { | |
38f7b009 HS |
62 | struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; |
63 | unsigned long time; | |
64 | ||
65 | time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); | |
fd507e2f AZ |
66 | |
67 | rtc_time_to_tm(time, tm); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) | |
72 | { | |
38f7b009 HS |
73 | struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; |
74 | ||
75 | __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); | |
fd507e2f AZ |
76 | return 0; |
77 | } | |
78 | ||
fd507e2f AZ |
79 | static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) |
80 | { | |
81 | unsigned short preload, delete; | |
82 | ||
38f7b009 | 83 | ep93xx_rtc_get_swcomp(dev, &preload, &delete); |
fd507e2f | 84 | |
fd507e2f AZ |
85 | seq_printf(seq, "preload\t\t: %d\n", preload); |
86 | seq_printf(seq, "delete\t\t: %d\n", delete); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
ff8371ac | 91 | static const struct rtc_class_ops ep93xx_rtc_ops = { |
fd507e2f | 92 | .read_time = ep93xx_rtc_read_time, |
fd507e2f AZ |
93 | .set_mmss = ep93xx_rtc_set_mmss, |
94 | .proc = ep93xx_rtc_proc, | |
95 | }; | |
96 | ||
38f7b009 | 97 | static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, |
fd507e2f AZ |
98 | struct device_attribute *attr, char *buf) |
99 | { | |
100 | unsigned short preload; | |
101 | ||
38f7b009 | 102 | ep93xx_rtc_get_swcomp(dev, &preload, NULL); |
fd507e2f AZ |
103 | |
104 | return sprintf(buf, "%d\n", preload); | |
105 | } | |
38f7b009 | 106 | static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); |
fd507e2f | 107 | |
38f7b009 | 108 | static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, |
fd507e2f AZ |
109 | struct device_attribute *attr, char *buf) |
110 | { | |
111 | unsigned short delete; | |
112 | ||
38f7b009 | 113 | ep93xx_rtc_get_swcomp(dev, NULL, &delete); |
fd507e2f AZ |
114 | |
115 | return sprintf(buf, "%d\n", delete); | |
116 | } | |
38f7b009 | 117 | static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); |
fd507e2f | 118 | |
b4877d2b HS |
119 | static struct attribute *ep93xx_rtc_attrs[] = { |
120 | &dev_attr_comp_preload.attr, | |
121 | &dev_attr_comp_delete.attr, | |
122 | NULL | |
123 | }; | |
124 | ||
125 | static const struct attribute_group ep93xx_rtc_sysfs_files = { | |
126 | .attrs = ep93xx_rtc_attrs, | |
127 | }; | |
fd507e2f | 128 | |
38f7b009 | 129 | static int __init ep93xx_rtc_probe(struct platform_device *pdev) |
fd507e2f | 130 | { |
38f7b009 HS |
131 | struct ep93xx_rtc *ep93xx_rtc; |
132 | struct resource *res; | |
133 | struct rtc_device *rtc; | |
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); | |
b4877d2b HS |
141 | if (!res) |
142 | return -ENXIO; | |
38f7b009 | 143 | |
b4877d2b HS |
144 | if (!devm_request_mem_region(&pdev->dev, res->start, |
145 | resource_size(res), pdev->name)) | |
146 | return -EBUSY; | |
38f7b009 | 147 | |
b4877d2b HS |
148 | ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start, |
149 | resource_size(res)); | |
150 | if (!ep93xx_rtc->mmio_base) | |
151 | return -ENXIO; | |
fd507e2f | 152 | |
38f7b009 | 153 | pdev->dev.platform_data = ep93xx_rtc; |
92d921c5 | 154 | platform_set_drvdata(pdev, rtc); |
38f7b009 HS |
155 | |
156 | rtc = rtc_device_register(pdev->name, | |
157 | &pdev->dev, &ep93xx_rtc_ops, THIS_MODULE); | |
fd507e2f | 158 | if (IS_ERR(rtc)) { |
38f7b009 | 159 | err = PTR_ERR(rtc); |
b4877d2b | 160 | goto exit; |
fd507e2f AZ |
161 | } |
162 | ||
b4877d2b | 163 | err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); |
38f7b009 HS |
164 | if (err) |
165 | goto fail; | |
fd507e2f AZ |
166 | |
167 | return 0; | |
38f7b009 HS |
168 | |
169 | fail: | |
b4877d2b HS |
170 | rtc_device_unregister(rtc); |
171 | exit: | |
92d921c5 | 172 | platform_set_drvdata(pdev, NULL); |
b4877d2b | 173 | pdev->dev.platform_data = NULL; |
38f7b009 | 174 | return err; |
fd507e2f AZ |
175 | } |
176 | ||
38f7b009 | 177 | static int __exit ep93xx_rtc_remove(struct platform_device *pdev) |
fd507e2f | 178 | { |
38f7b009 | 179 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
38f7b009 | 180 | |
b4877d2b HS |
181 | sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); |
182 | platform_set_drvdata(pdev, NULL); | |
38f7b009 | 183 | rtc_device_unregister(rtc); |
38f7b009 | 184 | pdev->dev.platform_data = NULL; |
fd507e2f | 185 | |
fd507e2f AZ |
186 | return 0; |
187 | } | |
188 | ||
ad28a07b KS |
189 | /* work with hotplug and coldplug */ |
190 | MODULE_ALIAS("platform:ep93xx-rtc"); | |
191 | ||
38f7b009 | 192 | static struct platform_driver ep93xx_rtc_driver = { |
fd507e2f AZ |
193 | .driver = { |
194 | .name = "ep93xx-rtc", | |
195 | .owner = THIS_MODULE, | |
196 | }, | |
38f7b009 | 197 | .remove = __exit_p(ep93xx_rtc_remove), |
fd507e2f AZ |
198 | }; |
199 | ||
200 | static int __init ep93xx_rtc_init(void) | |
201 | { | |
38f7b009 | 202 | return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe); |
fd507e2f AZ |
203 | } |
204 | ||
205 | static void __exit ep93xx_rtc_exit(void) | |
206 | { | |
38f7b009 | 207 | platform_driver_unregister(&ep93xx_rtc_driver); |
fd507e2f AZ |
208 | } |
209 | ||
210 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
211 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
212 | MODULE_LICENSE("GPL"); | |
213 | MODULE_VERSION(DRV_VERSION); | |
214 | ||
215 | module_init(ep93xx_rtc_init); | |
216 | module_exit(ep93xx_rtc_exit); |