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8ae6e163 DS |
1 | /* |
2 | * drivers/rtc/rtc-pl031.c | |
3 | * | |
4 | * Real Time Clock interface for ARM AMBA PrimeCell 031 RTC | |
5 | * | |
6 | * Author: Deepak Saxena <dsaxena@plexity.net> | |
7 | * | |
8 | * Copyright 2006 (c) MontaVista Software, Inc. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/platform_device.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/rtc.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/pm.h> | |
24 | ||
25 | #include <linux/amba/bus.h> | |
26 | ||
27 | #include <asm/io.h> | |
28 | #include <asm/bitops.h> | |
29 | #include <asm/hardware.h> | |
30 | #include <asm/irq.h> | |
31 | #include <asm/rtc.h> | |
32 | ||
33 | /* | |
34 | * Register definitions | |
35 | */ | |
36 | #define RTC_DR 0x00 /* Data read register */ | |
37 | #define RTC_MR 0x04 /* Match register */ | |
38 | #define RTC_LR 0x08 /* Data load register */ | |
39 | #define RTC_CR 0x0c /* Control register */ | |
40 | #define RTC_IMSC 0x10 /* Interrupt mask and set register */ | |
41 | #define RTC_RIS 0x14 /* Raw interrupt status register */ | |
42 | #define RTC_MIS 0x18 /* Masked interrupt status register */ | |
43 | #define RTC_ICR 0x1c /* Interrupt clear register */ | |
44 | ||
45 | struct pl031_local { | |
46 | struct rtc_device *rtc; | |
47 | void __iomem *base; | |
48 | }; | |
49 | ||
50 | static irqreturn_t pl031_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
51 | { | |
52 | struct rtc_device *rtc = dev_id; | |
53 | ||
54 | rtc_update_irq(&rtc->class_dev, 1, RTC_AF); | |
55 | ||
56 | return IRQ_HANDLED; | |
57 | } | |
58 | ||
59 | static int pl031_open(struct device *dev) | |
60 | { | |
61 | /* | |
62 | * We request IRQ in pl031_probe, so nothing to do here... | |
63 | */ | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static void pl031_release(struct device *dev) | |
68 | { | |
69 | } | |
70 | ||
71 | static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
72 | { | |
73 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
74 | ||
75 | switch (cmd) { | |
76 | case RTC_AIE_OFF: | |
77 | __raw_writel(1, ldata->base + RTC_MIS); | |
78 | return 0; | |
79 | case RTC_AIE_ON: | |
80 | __raw_writel(0, ldata->base + RTC_MIS); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | return -ENOIOCTLCMD; | |
85 | } | |
86 | ||
87 | static int pl031_read_time(struct device *dev, struct rtc_time *tm) | |
88 | { | |
89 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
90 | ||
91 | rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | static int pl031_set_time(struct device *dev, struct rtc_time *tm) | |
97 | { | |
98 | unsigned long time; | |
99 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
100 | ||
101 | rtc_tm_to_time(tm, &time); | |
102 | __raw_writel(time, ldata->base + RTC_LR); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
108 | { | |
109 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
110 | ||
111 | rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time); | |
112 | alarm->pending = __raw_readl(ldata->base + RTC_RIS); | |
113 | alarm->enabled = __raw_readl(ldata->base + RTC_IMSC); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
119 | { | |
120 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
121 | unsigned long time; | |
122 | ||
123 | rtc_tm_to_time(&alarm->time, &time); | |
124 | ||
125 | __raw_writel(time, ldata->base + RTC_MR); | |
126 | __raw_writel(!alarm->enabled, ldata->base + RTC_MIS); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
ff8371ac | 131 | static const struct rtc_class_ops pl031_ops = { |
8ae6e163 DS |
132 | .open = pl031_open, |
133 | .release = pl031_release, | |
134 | .ioctl = pl031_ioctl, | |
135 | .read_time = pl031_read_time, | |
136 | .set_time = pl031_set_time, | |
137 | .read_alarm = pl031_read_alarm, | |
138 | .set_alarm = pl031_set_alarm, | |
139 | }; | |
140 | ||
141 | static int pl031_remove(struct amba_device *adev) | |
142 | { | |
143 | struct pl031_local *ldata = dev_get_drvdata(&adev->dev); | |
144 | ||
145 | if (ldata) { | |
146 | dev_set_drvdata(&adev->dev, NULL); | |
147 | free_irq(adev->irq[0], ldata->rtc); | |
148 | rtc_device_unregister(ldata->rtc); | |
149 | iounmap(ldata->base); | |
150 | kfree(ldata); | |
151 | } | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static int pl031_probe(struct amba_device *adev, void *id) | |
157 | { | |
158 | int ret; | |
159 | struct pl031_local *ldata; | |
160 | ||
161 | ||
162 | ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL); | |
163 | if (!ldata) { | |
164 | ret = -ENOMEM; | |
165 | goto out; | |
166 | } | |
167 | dev_set_drvdata(&adev->dev, ldata); | |
168 | ||
169 | ldata->base = ioremap(adev->res.start, | |
170 | adev->res.end - adev->res.start + 1); | |
171 | if (!ldata->base) { | |
172 | ret = -ENOMEM; | |
173 | goto out_no_remap; | |
174 | } | |
175 | ||
dace1453 | 176 | if (request_irq(adev->irq[0], pl031_interrupt, IRQF_DISABLED, |
8ae6e163 DS |
177 | "rtc-pl031", ldata->rtc)) { |
178 | ret = -EIO; | |
179 | goto out_no_irq; | |
180 | } | |
181 | ||
182 | ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops, | |
183 | THIS_MODULE); | |
184 | if (IS_ERR(ldata->rtc)) { | |
185 | ret = PTR_ERR(ldata->rtc); | |
186 | goto out_no_rtc; | |
187 | } | |
188 | ||
189 | return 0; | |
190 | ||
191 | out_no_rtc: | |
192 | free_irq(adev->irq[0], ldata->rtc); | |
193 | out_no_irq: | |
194 | iounmap(ldata->base); | |
195 | out_no_remap: | |
196 | dev_set_drvdata(&adev->dev, NULL); | |
197 | kfree(ldata); | |
198 | out: | |
199 | return ret; | |
200 | } | |
201 | ||
202 | static struct amba_id pl031_ids[] __initdata = { | |
203 | { | |
204 | .id = 0x00041031, | |
205 | .mask = 0x000fffff, }, | |
206 | {0, 0}, | |
207 | }; | |
208 | ||
209 | static struct amba_driver pl031_driver = { | |
210 | .drv = { | |
211 | .name = "rtc-pl031", | |
212 | }, | |
213 | .id_table = pl031_ids, | |
214 | .probe = pl031_probe, | |
215 | .remove = pl031_remove, | |
216 | }; | |
217 | ||
218 | static int __init pl031_init(void) | |
219 | { | |
220 | return amba_driver_register(&pl031_driver); | |
221 | } | |
222 | ||
223 | static void __exit pl031_exit(void) | |
224 | { | |
225 | amba_driver_unregister(&pl031_driver); | |
226 | } | |
227 | ||
228 | module_init(pl031_init); | |
229 | module_exit(pl031_exit); | |
230 | ||
231 | MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net"); | |
232 | MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver"); | |
233 | MODULE_LICENSE("GPL"); |