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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 | */ | |
8ae6e163 DS |
15 | #include <linux/module.h> |
16 | #include <linux/rtc.h> | |
17 | #include <linux/init.h> | |
8ae6e163 | 18 | #include <linux/interrupt.h> |
8ae6e163 | 19 | #include <linux/amba/bus.h> |
2dba8518 | 20 | #include <linux/io.h> |
8ae6e163 DS |
21 | |
22 | /* | |
23 | * Register definitions | |
24 | */ | |
25 | #define RTC_DR 0x00 /* Data read register */ | |
26 | #define RTC_MR 0x04 /* Match register */ | |
27 | #define RTC_LR 0x08 /* Data load register */ | |
28 | #define RTC_CR 0x0c /* Control register */ | |
29 | #define RTC_IMSC 0x10 /* Interrupt mask and set register */ | |
30 | #define RTC_RIS 0x14 /* Raw interrupt status register */ | |
31 | #define RTC_MIS 0x18 /* Masked interrupt status register */ | |
32 | #define RTC_ICR 0x1c /* Interrupt clear register */ | |
33 | ||
34 | struct pl031_local { | |
35 | struct rtc_device *rtc; | |
36 | void __iomem *base; | |
37 | }; | |
38 | ||
7d12e780 | 39 | static irqreturn_t pl031_interrupt(int irq, void *dev_id) |
8ae6e163 DS |
40 | { |
41 | struct rtc_device *rtc = dev_id; | |
42 | ||
ab6a2d70 | 43 | rtc_update_irq(rtc, 1, RTC_AF); |
8ae6e163 DS |
44 | |
45 | return IRQ_HANDLED; | |
46 | } | |
47 | ||
8ae6e163 DS |
48 | static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
49 | { | |
50 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
51 | ||
52 | switch (cmd) { | |
53 | case RTC_AIE_OFF: | |
2934d6a8 | 54 | writel(1, ldata->base + RTC_MIS); |
8ae6e163 DS |
55 | return 0; |
56 | case RTC_AIE_ON: | |
2934d6a8 | 57 | writel(0, ldata->base + RTC_MIS); |
8ae6e163 DS |
58 | return 0; |
59 | } | |
60 | ||
61 | return -ENOIOCTLCMD; | |
62 | } | |
63 | ||
64 | static int pl031_read_time(struct device *dev, struct rtc_time *tm) | |
65 | { | |
66 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
67 | ||
2934d6a8 | 68 | rtc_time_to_tm(readl(ldata->base + RTC_DR), tm); |
8ae6e163 DS |
69 | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int pl031_set_time(struct device *dev, struct rtc_time *tm) | |
74 | { | |
75 | unsigned long time; | |
76 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
77 | ||
78 | rtc_tm_to_time(tm, &time); | |
2934d6a8 | 79 | writel(time, ldata->base + RTC_LR); |
8ae6e163 DS |
80 | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
85 | { | |
86 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
87 | ||
2934d6a8 LW |
88 | rtc_time_to_tm(readl(ldata->base + RTC_MR), &alarm->time); |
89 | alarm->pending = readl(ldata->base + RTC_RIS); | |
90 | alarm->enabled = readl(ldata->base + RTC_IMSC); | |
8ae6e163 DS |
91 | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) | |
96 | { | |
97 | struct pl031_local *ldata = dev_get_drvdata(dev); | |
98 | unsigned long time; | |
99 | ||
100 | rtc_tm_to_time(&alarm->time, &time); | |
101 | ||
2934d6a8 LW |
102 | writel(time, ldata->base + RTC_MR); |
103 | writel(!alarm->enabled, ldata->base + RTC_MIS); | |
8ae6e163 DS |
104 | |
105 | return 0; | |
106 | } | |
107 | ||
ff8371ac | 108 | static const struct rtc_class_ops pl031_ops = { |
8ae6e163 DS |
109 | .ioctl = pl031_ioctl, |
110 | .read_time = pl031_read_time, | |
111 | .set_time = pl031_set_time, | |
112 | .read_alarm = pl031_read_alarm, | |
113 | .set_alarm = pl031_set_alarm, | |
114 | }; | |
115 | ||
116 | static int pl031_remove(struct amba_device *adev) | |
117 | { | |
118 | struct pl031_local *ldata = dev_get_drvdata(&adev->dev); | |
119 | ||
2dba8518 RK |
120 | amba_set_drvdata(adev, NULL); |
121 | free_irq(adev->irq[0], ldata->rtc); | |
122 | rtc_device_unregister(ldata->rtc); | |
123 | iounmap(ldata->base); | |
124 | kfree(ldata); | |
125 | amba_release_regions(adev); | |
8ae6e163 DS |
126 | |
127 | return 0; | |
128 | } | |
129 | ||
03fbdb15 | 130 | static int pl031_probe(struct amba_device *adev, struct amba_id *id) |
8ae6e163 DS |
131 | { |
132 | int ret; | |
133 | struct pl031_local *ldata; | |
134 | ||
2dba8518 RK |
135 | ret = amba_request_regions(adev, NULL); |
136 | if (ret) | |
137 | goto err_req; | |
8ae6e163 DS |
138 | |
139 | ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL); | |
140 | if (!ldata) { | |
141 | ret = -ENOMEM; | |
142 | goto out; | |
143 | } | |
8ae6e163 | 144 | |
dc890c2d | 145 | ldata->base = ioremap(adev->res.start, resource_size(&adev->res)); |
8ae6e163 DS |
146 | if (!ldata->base) { |
147 | ret = -ENOMEM; | |
148 | goto out_no_remap; | |
149 | } | |
150 | ||
2dba8518 RK |
151 | amba_set_drvdata(adev, ldata); |
152 | ||
dace1453 | 153 | if (request_irq(adev->irq[0], pl031_interrupt, IRQF_DISABLED, |
8ae6e163 DS |
154 | "rtc-pl031", ldata->rtc)) { |
155 | ret = -EIO; | |
156 | goto out_no_irq; | |
157 | } | |
158 | ||
159 | ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops, | |
160 | THIS_MODULE); | |
161 | if (IS_ERR(ldata->rtc)) { | |
162 | ret = PTR_ERR(ldata->rtc); | |
163 | goto out_no_rtc; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | ||
168 | out_no_rtc: | |
169 | free_irq(adev->irq[0], ldata->rtc); | |
170 | out_no_irq: | |
171 | iounmap(ldata->base); | |
2dba8518 | 172 | amba_set_drvdata(adev, NULL); |
8ae6e163 | 173 | out_no_remap: |
8ae6e163 DS |
174 | kfree(ldata); |
175 | out: | |
2dba8518 RK |
176 | amba_release_regions(adev); |
177 | err_req: | |
8ae6e163 DS |
178 | return ret; |
179 | } | |
180 | ||
181 | static struct amba_id pl031_ids[] __initdata = { | |
182 | { | |
2934d6a8 LW |
183 | .id = 0x00041031, |
184 | .mask = 0x000fffff, | |
185 | }, | |
8ae6e163 DS |
186 | {0, 0}, |
187 | }; | |
188 | ||
189 | static struct amba_driver pl031_driver = { | |
190 | .drv = { | |
191 | .name = "rtc-pl031", | |
192 | }, | |
193 | .id_table = pl031_ids, | |
194 | .probe = pl031_probe, | |
195 | .remove = pl031_remove, | |
196 | }; | |
197 | ||
198 | static int __init pl031_init(void) | |
199 | { | |
200 | return amba_driver_register(&pl031_driver); | |
201 | } | |
202 | ||
203 | static void __exit pl031_exit(void) | |
204 | { | |
205 | amba_driver_unregister(&pl031_driver); | |
206 | } | |
207 | ||
208 | module_init(pl031_init); | |
209 | module_exit(pl031_exit); | |
210 | ||
211 | MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net"); | |
212 | MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver"); | |
213 | MODULE_LICENSE("GPL"); |