Commit | Line | Data |
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a190901c RK |
1 | /* |
2 | * linux/drivers/rtc/rtc-pl030.c | |
3 | * | |
4 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/rtc.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/amba/bus.h> | |
15 | #include <linux/io.h> | |
16 | ||
17 | #define RTC_DR (0) | |
18 | #define RTC_MR (4) | |
19 | #define RTC_STAT (8) | |
20 | #define RTC_EOI (8) | |
21 | #define RTC_LR (12) | |
22 | #define RTC_CR (16) | |
23 | #define RTC_CR_MIE (1 << 0) | |
24 | ||
25 | struct pl030_rtc { | |
26 | struct rtc_device *rtc; | |
27 | void __iomem *base; | |
28 | }; | |
29 | ||
30 | static irqreturn_t pl030_interrupt(int irq, void *dev_id) | |
31 | { | |
32 | struct pl030_rtc *rtc = dev_id; | |
33 | writel(0, rtc->base + RTC_EOI); | |
34 | return IRQ_HANDLED; | |
35 | } | |
36 | ||
37 | static int pl030_open(struct device *dev) | |
38 | { | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static void pl030_release(struct device *dev) | |
43 | { | |
44 | } | |
45 | ||
46 | static int pl030_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
47 | { | |
48 | return -ENOIOCTLCMD; | |
49 | } | |
50 | ||
51 | static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
52 | { | |
53 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
54 | ||
55 | rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
60 | { | |
61 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
62 | unsigned long time; | |
63 | int ret; | |
64 | ||
65 | /* | |
66 | * At the moment, we can only deal with non-wildcarded alarm times. | |
67 | */ | |
68 | ret = rtc_valid_tm(&alrm->time); | |
69 | if (ret == 0) | |
70 | ret = rtc_tm_to_time(&alrm->time, &time); | |
71 | if (ret == 0) | |
72 | writel(time, rtc->base + RTC_MR); | |
73 | return ret; | |
74 | } | |
75 | ||
76 | static int pl030_read_time(struct device *dev, struct rtc_time *tm) | |
77 | { | |
78 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
79 | ||
80 | rtc_time_to_tm(readl(rtc->base + RTC_DR), tm); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Set the RTC time. Unfortunately, we can't accurately set | |
87 | * the point at which the counter updates. | |
88 | * | |
89 | * Also, since RTC_LR is transferred to RTC_CR on next rising | |
90 | * edge of the 1Hz clock, we must write the time one second | |
91 | * in advance. | |
92 | */ | |
93 | static int pl030_set_time(struct device *dev, struct rtc_time *tm) | |
94 | { | |
95 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
96 | unsigned long time; | |
97 | int ret; | |
98 | ||
99 | ret = rtc_tm_to_time(tm, &time); | |
100 | if (ret == 0) | |
101 | writel(time + 1, rtc->base + RTC_LR); | |
102 | ||
103 | return ret; | |
104 | } | |
105 | ||
106 | static const struct rtc_class_ops pl030_ops = { | |
107 | .open = pl030_open, | |
108 | .release = pl030_release, | |
109 | .ioctl = pl030_ioctl, | |
110 | .read_time = pl030_read_time, | |
111 | .set_time = pl030_set_time, | |
112 | .read_alarm = pl030_read_alarm, | |
113 | .set_alarm = pl030_set_alarm, | |
114 | }; | |
115 | ||
116 | static int pl030_probe(struct amba_device *dev, void *id) | |
117 | { | |
118 | struct pl030_rtc *rtc; | |
119 | int ret; | |
120 | ||
121 | ret = amba_request_regions(dev, NULL); | |
122 | if (ret) | |
123 | goto err_req; | |
124 | ||
125 | rtc = kmalloc(sizeof(*rtc), GFP_KERNEL); | |
126 | if (!rtc) { | |
127 | ret = -ENOMEM; | |
128 | goto err_rtc; | |
129 | } | |
130 | ||
131 | rtc->base = ioremap(dev->res.start, SZ_4K); | |
132 | if (!rtc->base) { | |
133 | ret = -ENOMEM; | |
134 | goto err_map; | |
135 | } | |
136 | ||
137 | __raw_writel(0, rtc->base + RTC_CR); | |
138 | __raw_writel(0, rtc->base + RTC_EOI); | |
139 | ||
140 | amba_set_drvdata(dev, rtc); | |
141 | ||
142 | ret = request_irq(dev->irq[0], pl030_interrupt, IRQF_DISABLED, | |
143 | "rtc-pl030", rtc); | |
144 | if (ret) | |
145 | goto err_irq; | |
146 | ||
147 | rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops, | |
148 | THIS_MODULE); | |
149 | if (IS_ERR(rtc->rtc)) { | |
150 | ret = PTR_ERR(rtc->rtc); | |
151 | goto err_reg; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | ||
156 | err_reg: | |
157 | free_irq(dev->irq[0], rtc); | |
158 | err_irq: | |
159 | iounmap(rtc->base); | |
160 | err_map: | |
161 | kfree(rtc); | |
162 | err_rtc: | |
163 | amba_release_regions(dev); | |
164 | err_req: | |
165 | return ret; | |
166 | } | |
167 | ||
168 | static int pl030_remove(struct amba_device *dev) | |
169 | { | |
170 | struct pl030_rtc *rtc = amba_get_drvdata(dev); | |
171 | ||
172 | amba_set_drvdata(dev, NULL); | |
173 | ||
174 | writel(0, rtc->base + RTC_CR); | |
175 | ||
176 | free_irq(dev->irq[0], rtc); | |
177 | rtc_device_unregister(rtc->rtc); | |
178 | iounmap(rtc->base); | |
179 | kfree(rtc); | |
180 | amba_release_regions(dev); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static struct amba_id pl030_ids[] = { | |
186 | { | |
187 | .id = 0x00041030, | |
188 | .mask = 0x000fffff, | |
189 | }, | |
190 | { 0, 0 }, | |
191 | }; | |
192 | ||
193 | static struct amba_driver pl030_driver = { | |
194 | .drv = { | |
195 | .name = "rtc-pl030", | |
196 | }, | |
197 | .probe = pl030_probe, | |
198 | .remove = pl030_remove, | |
199 | .id_table = pl030_ids, | |
200 | }; | |
201 | ||
202 | static int __init pl030_init(void) | |
203 | { | |
204 | return amba_driver_register(&pl030_driver); | |
205 | } | |
206 | ||
207 | static void __exit pl030_exit(void) | |
208 | { | |
209 | amba_driver_unregister(&pl030_driver); | |
210 | } | |
211 | ||
212 | module_init(pl030_init); | |
213 | module_exit(pl030_exit); | |
214 | ||
215 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
216 | MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver"); | |
217 | MODULE_LICENSE("GPL"); |