2 * linux/drivers/rtc/rtc-pl030.c
4 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
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.
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>
23 #define RTC_CR_MIE (1 << 0)
26 struct rtc_device
*rtc
;
30 static irqreturn_t
pl030_interrupt(int irq
, void *dev_id
)
32 struct pl030_rtc
*rtc
= dev_id
;
33 writel(0, rtc
->base
+ RTC_EOI
);
37 static int pl030_open(struct device
*dev
)
42 static void pl030_release(struct device
*dev
)
46 static int pl030_ioctl(struct device
*dev
, unsigned int cmd
, unsigned long arg
)
51 static int pl030_read_alarm(struct device
*dev
, struct rtc_wkalrm
*alrm
)
53 struct pl030_rtc
*rtc
= dev_get_drvdata(dev
);
55 rtc_time_to_tm(readl(rtc
->base
+ RTC_MR
), &alrm
->time
);
59 static int pl030_set_alarm(struct device
*dev
, struct rtc_wkalrm
*alrm
)
61 struct pl030_rtc
*rtc
= dev_get_drvdata(dev
);
66 * At the moment, we can only deal with non-wildcarded alarm times.
68 ret
= rtc_valid_tm(&alrm
->time
);
70 ret
= rtc_tm_to_time(&alrm
->time
, &time
);
72 writel(time
, rtc
->base
+ RTC_MR
);
76 static int pl030_read_time(struct device
*dev
, struct rtc_time
*tm
)
78 struct pl030_rtc
*rtc
= dev_get_drvdata(dev
);
80 rtc_time_to_tm(readl(rtc
->base
+ RTC_DR
), tm
);
86 * Set the RTC time. Unfortunately, we can't accurately set
87 * the point at which the counter updates.
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
93 static int pl030_set_time(struct device
*dev
, struct rtc_time
*tm
)
95 struct pl030_rtc
*rtc
= dev_get_drvdata(dev
);
99 ret
= rtc_tm_to_time(tm
, &time
);
101 writel(time
+ 1, rtc
->base
+ RTC_LR
);
106 static const struct rtc_class_ops pl030_ops
= {
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
,
116 static int pl030_probe(struct amba_device
*dev
, void *id
)
118 struct pl030_rtc
*rtc
;
121 ret
= amba_request_regions(dev
, NULL
);
125 rtc
= kmalloc(sizeof(*rtc
), GFP_KERNEL
);
131 rtc
->base
= ioremap(dev
->res
.start
, SZ_4K
);
137 __raw_writel(0, rtc
->base
+ RTC_CR
);
138 __raw_writel(0, rtc
->base
+ RTC_EOI
);
140 amba_set_drvdata(dev
, rtc
);
142 ret
= request_irq(dev
->irq
[0], pl030_interrupt
, IRQF_DISABLED
,
147 rtc
->rtc
= rtc_device_register("pl030", &dev
->dev
, &pl030_ops
,
149 if (IS_ERR(rtc
->rtc
)) {
150 ret
= PTR_ERR(rtc
->rtc
);
157 free_irq(dev
->irq
[0], rtc
);
163 amba_release_regions(dev
);
168 static int pl030_remove(struct amba_device
*dev
)
170 struct pl030_rtc
*rtc
= amba_get_drvdata(dev
);
172 amba_set_drvdata(dev
, NULL
);
174 writel(0, rtc
->base
+ RTC_CR
);
176 free_irq(dev
->irq
[0], rtc
);
177 rtc_device_unregister(rtc
->rtc
);
180 amba_release_regions(dev
);
185 static struct amba_id pl030_ids
[] = {
193 static struct amba_driver pl030_driver
= {
197 .probe
= pl030_probe
,
198 .remove
= pl030_remove
,
199 .id_table
= pl030_ids
,
202 static int __init
pl030_init(void)
204 return amba_driver_register(&pl030_driver
);
207 static void __exit
pl030_exit(void)
209 amba_driver_unregister(&pl030_driver
);
212 module_init(pl030_init
);
213 module_exit(pl030_exit
);
215 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
216 MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
217 MODULE_LICENSE("GPL");
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