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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 | ||
a190901c RK |
37 | static int pl030_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
38 | { | |
39 | return -ENOIOCTLCMD; | |
40 | } | |
41 | ||
42 | static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
43 | { | |
44 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
45 | ||
46 | rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
51 | { | |
52 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
53 | unsigned long time; | |
54 | int ret; | |
55 | ||
56 | /* | |
57 | * At the moment, we can only deal with non-wildcarded alarm times. | |
58 | */ | |
59 | ret = rtc_valid_tm(&alrm->time); | |
60 | if (ret == 0) | |
61 | ret = rtc_tm_to_time(&alrm->time, &time); | |
62 | if (ret == 0) | |
63 | writel(time, rtc->base + RTC_MR); | |
64 | return ret; | |
65 | } | |
66 | ||
67 | static int pl030_read_time(struct device *dev, struct rtc_time *tm) | |
68 | { | |
69 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
70 | ||
71 | rtc_time_to_tm(readl(rtc->base + RTC_DR), tm); | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Set the RTC time. Unfortunately, we can't accurately set | |
78 | * the point at which the counter updates. | |
79 | * | |
80 | * Also, since RTC_LR is transferred to RTC_CR on next rising | |
81 | * edge of the 1Hz clock, we must write the time one second | |
82 | * in advance. | |
83 | */ | |
84 | static int pl030_set_time(struct device *dev, struct rtc_time *tm) | |
85 | { | |
86 | struct pl030_rtc *rtc = dev_get_drvdata(dev); | |
87 | unsigned long time; | |
88 | int ret; | |
89 | ||
90 | ret = rtc_tm_to_time(tm, &time); | |
91 | if (ret == 0) | |
92 | writel(time + 1, rtc->base + RTC_LR); | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | static const struct rtc_class_ops pl030_ops = { | |
a190901c RK |
98 | .ioctl = pl030_ioctl, |
99 | .read_time = pl030_read_time, | |
100 | .set_time = pl030_set_time, | |
101 | .read_alarm = pl030_read_alarm, | |
102 | .set_alarm = pl030_set_alarm, | |
103 | }; | |
104 | ||
03fbdb15 | 105 | static int pl030_probe(struct amba_device *dev, struct amba_id *id) |
a190901c RK |
106 | { |
107 | struct pl030_rtc *rtc; | |
108 | int ret; | |
109 | ||
110 | ret = amba_request_regions(dev, NULL); | |
111 | if (ret) | |
112 | goto err_req; | |
113 | ||
114 | rtc = kmalloc(sizeof(*rtc), GFP_KERNEL); | |
115 | if (!rtc) { | |
116 | ret = -ENOMEM; | |
117 | goto err_rtc; | |
118 | } | |
119 | ||
120 | rtc->base = ioremap(dev->res.start, SZ_4K); | |
121 | if (!rtc->base) { | |
122 | ret = -ENOMEM; | |
123 | goto err_map; | |
124 | } | |
125 | ||
126 | __raw_writel(0, rtc->base + RTC_CR); | |
127 | __raw_writel(0, rtc->base + RTC_EOI); | |
128 | ||
129 | amba_set_drvdata(dev, rtc); | |
130 | ||
131 | ret = request_irq(dev->irq[0], pl030_interrupt, IRQF_DISABLED, | |
132 | "rtc-pl030", rtc); | |
133 | if (ret) | |
134 | goto err_irq; | |
135 | ||
136 | rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops, | |
137 | THIS_MODULE); | |
138 | if (IS_ERR(rtc->rtc)) { | |
139 | ret = PTR_ERR(rtc->rtc); | |
140 | goto err_reg; | |
141 | } | |
142 | ||
143 | return 0; | |
144 | ||
145 | err_reg: | |
146 | free_irq(dev->irq[0], rtc); | |
147 | err_irq: | |
148 | iounmap(rtc->base); | |
149 | err_map: | |
150 | kfree(rtc); | |
151 | err_rtc: | |
152 | amba_release_regions(dev); | |
153 | err_req: | |
154 | return ret; | |
155 | } | |
156 | ||
157 | static int pl030_remove(struct amba_device *dev) | |
158 | { | |
159 | struct pl030_rtc *rtc = amba_get_drvdata(dev); | |
160 | ||
161 | amba_set_drvdata(dev, NULL); | |
162 | ||
163 | writel(0, rtc->base + RTC_CR); | |
164 | ||
165 | free_irq(dev->irq[0], rtc); | |
166 | rtc_device_unregister(rtc->rtc); | |
167 | iounmap(rtc->base); | |
168 | kfree(rtc); | |
169 | amba_release_regions(dev); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static struct amba_id pl030_ids[] = { | |
175 | { | |
176 | .id = 0x00041030, | |
177 | .mask = 0x000fffff, | |
178 | }, | |
179 | { 0, 0 }, | |
180 | }; | |
181 | ||
182 | static struct amba_driver pl030_driver = { | |
183 | .drv = { | |
184 | .name = "rtc-pl030", | |
185 | }, | |
186 | .probe = pl030_probe, | |
187 | .remove = pl030_remove, | |
188 | .id_table = pl030_ids, | |
189 | }; | |
190 | ||
191 | static int __init pl030_init(void) | |
192 | { | |
193 | return amba_driver_register(&pl030_driver); | |
194 | } | |
195 | ||
196 | static void __exit pl030_exit(void) | |
197 | { | |
198 | amba_driver_unregister(&pl030_driver); | |
199 | } | |
200 | ||
201 | module_init(pl030_init); | |
202 | module_exit(pl030_exit); | |
203 | ||
204 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
205 | MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver"); | |
206 | MODULE_LICENSE("GPL"); |