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 HS |
15 | #include <linux/io.h> |
16 | ||
17 | #define EP93XX_RTC_DATA 0x000 | |
18 | #define EP93XX_RTC_MATCH 0x004 | |
19 | #define EP93XX_RTC_STATUS 0x008 | |
20 | #define EP93XX_RTC_STATUS_INTR (1<<0) | |
21 | #define EP93XX_RTC_LOAD 0x00C | |
22 | #define EP93XX_RTC_CONTROL 0x010 | |
23 | #define EP93XX_RTC_CONTROL_MIE (1<<0) | |
24 | #define EP93XX_RTC_SWCOMP 0x108 | |
25 | #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 | |
26 | #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 | |
27 | #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff | |
28 | #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 | |
29 | ||
30 | #define DRV_VERSION "0.3" | |
fd507e2f | 31 | |
38f7b009 HS |
32 | /* |
33 | * struct device dev.platform_data is used to store our private data | |
34 | * because struct rtc_device does not have a variable to hold it. | |
35 | */ | |
36 | struct ep93xx_rtc { | |
37 | void __iomem *mmio_base; | |
38 | }; | |
fd507e2f | 39 | |
38f7b009 | 40 | static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, |
fd507e2f AZ |
41 | unsigned short *delete) |
42 | { | |
38f7b009 HS |
43 | struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; |
44 | unsigned long comp; | |
45 | ||
46 | comp = __raw_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 | { | |
38f7b009 HS |
61 | struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; |
62 | unsigned long time; | |
63 | ||
64 | time = __raw_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 | { | |
38f7b009 HS |
72 | struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; |
73 | ||
74 | __raw_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 AZ |
117 | |
118 | ||
38f7b009 | 119 | static int __init ep93xx_rtc_probe(struct platform_device *pdev) |
fd507e2f | 120 | { |
38f7b009 HS |
121 | struct ep93xx_rtc *ep93xx_rtc; |
122 | struct resource *res; | |
123 | struct rtc_device *rtc; | |
124 | int err; | |
125 | ||
126 | ep93xx_rtc = kzalloc(sizeof(struct ep93xx_rtc), GFP_KERNEL); | |
127 | if (ep93xx_rtc == NULL) | |
128 | return -ENOMEM; | |
129 | ||
130 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
971370cc JL |
131 | if (res == NULL) { |
132 | err = -ENXIO; | |
133 | goto fail_free; | |
134 | } | |
38f7b009 HS |
135 | |
136 | res = request_mem_region(res->start, resource_size(res), pdev->name); | |
971370cc JL |
137 | if (res == NULL) { |
138 | err = -EBUSY; | |
139 | goto fail_free; | |
140 | } | |
38f7b009 HS |
141 | |
142 | ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res)); | |
143 | if (ep93xx_rtc->mmio_base == NULL) { | |
144 | err = -ENXIO; | |
145 | goto fail; | |
146 | } | |
fd507e2f | 147 | |
38f7b009 HS |
148 | pdev->dev.platform_data = ep93xx_rtc; |
149 | ||
150 | rtc = rtc_device_register(pdev->name, | |
151 | &pdev->dev, &ep93xx_rtc_ops, THIS_MODULE); | |
fd507e2f | 152 | if (IS_ERR(rtc)) { |
38f7b009 HS |
153 | err = PTR_ERR(rtc); |
154 | goto fail; | |
fd507e2f AZ |
155 | } |
156 | ||
38f7b009 | 157 | platform_set_drvdata(pdev, rtc); |
fd507e2f | 158 | |
38f7b009 HS |
159 | err = device_create_file(&pdev->dev, &dev_attr_comp_preload); |
160 | if (err) | |
161 | goto fail; | |
162 | err = device_create_file(&pdev->dev, &dev_attr_comp_delete); | |
163 | if (err) { | |
164 | device_remove_file(&pdev->dev, &dev_attr_comp_preload); | |
165 | goto fail; | |
166 | } | |
fd507e2f AZ |
167 | |
168 | return 0; | |
38f7b009 HS |
169 | |
170 | fail: | |
171 | if (ep93xx_rtc->mmio_base) { | |
172 | iounmap(ep93xx_rtc->mmio_base); | |
173 | pdev->dev.platform_data = NULL; | |
174 | } | |
175 | release_mem_region(res->start, resource_size(res)); | |
971370cc JL |
176 | fail_free: |
177 | kfree(ep93xx_rtc); | |
38f7b009 | 178 | return err; |
fd507e2f AZ |
179 | } |
180 | ||
38f7b009 | 181 | static int __exit ep93xx_rtc_remove(struct platform_device *pdev) |
fd507e2f | 182 | { |
38f7b009 HS |
183 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
184 | struct ep93xx_rtc *ep93xx_rtc = pdev->dev.platform_data; | |
185 | struct resource *res; | |
186 | ||
187 | /* cleanup sysfs */ | |
188 | device_remove_file(&pdev->dev, &dev_attr_comp_delete); | |
189 | device_remove_file(&pdev->dev, &dev_attr_comp_preload); | |
190 | ||
191 | rtc_device_unregister(rtc); | |
192 | ||
193 | iounmap(ep93xx_rtc->mmio_base); | |
194 | pdev->dev.platform_data = NULL; | |
fd507e2f | 195 | |
38f7b009 HS |
196 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
197 | release_mem_region(res->start, resource_size(res)); | |
fd507e2f | 198 | |
38f7b009 | 199 | platform_set_drvdata(pdev, NULL); |
fd507e2f AZ |
200 | |
201 | return 0; | |
202 | } | |
203 | ||
ad28a07b KS |
204 | /* work with hotplug and coldplug */ |
205 | MODULE_ALIAS("platform:ep93xx-rtc"); | |
206 | ||
38f7b009 | 207 | static struct platform_driver ep93xx_rtc_driver = { |
fd507e2f AZ |
208 | .driver = { |
209 | .name = "ep93xx-rtc", | |
210 | .owner = THIS_MODULE, | |
211 | }, | |
38f7b009 | 212 | .remove = __exit_p(ep93xx_rtc_remove), |
fd507e2f AZ |
213 | }; |
214 | ||
215 | static int __init ep93xx_rtc_init(void) | |
216 | { | |
38f7b009 | 217 | return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe); |
fd507e2f AZ |
218 | } |
219 | ||
220 | static void __exit ep93xx_rtc_exit(void) | |
221 | { | |
38f7b009 | 222 | platform_driver_unregister(&ep93xx_rtc_driver); |
fd507e2f AZ |
223 | } |
224 | ||
225 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
226 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
227 | MODULE_LICENSE("GPL"); | |
228 | MODULE_VERSION(DRV_VERSION); | |
229 | ||
230 | module_init(ep93xx_rtc_init); | |
231 | module_exit(ep93xx_rtc_exit); |