Linux Kernel  3.7.1
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olpc-xo1-rtc.c
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1 /*
2  * Support for OLPC XO-1 Real Time Clock (RTC)
3  *
4  * Copyright (C) 2011 One Laptop per Child
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 as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11 
12 #include <linux/mc146818rtc.h>
13 #include <linux/platform_device.h>
14 #include <linux/rtc.h>
15 #include <linux/of.h>
16 
17 #include <asm/msr.h>
18 #include <asm/olpc.h>
19 
20 static void rtc_wake_on(struct device *dev)
21 {
23 }
24 
25 static void rtc_wake_off(struct device *dev)
26 {
28 }
29 
30 static struct resource rtc_platform_resource[] = {
31  [0] = {
32  .start = RTC_PORT(0),
33  .end = RTC_PORT(1),
34  .flags = IORESOURCE_IO,
35  },
36  [1] = {
37  .start = RTC_IRQ,
38  .end = RTC_IRQ,
39  .flags = IORESOURCE_IRQ,
40  }
41 };
42 
43 static struct cmos_rtc_board_info rtc_info = {
44  .rtc_day_alarm = 0,
45  .rtc_mon_alarm = 0,
46  .rtc_century = 0,
47  .wake_on = rtc_wake_on,
48  .wake_off = rtc_wake_off,
49 };
50 
51 static struct platform_device xo1_rtc_device = {
52  .name = "rtc_cmos",
53  .id = -1,
54  .num_resources = ARRAY_SIZE(rtc_platform_resource),
55  .dev.platform_data = &rtc_info,
56  .resource = rtc_platform_resource,
57 };
58 
59 static int __init xo1_rtc_init(void)
60 {
61  int r;
62  struct device_node *node;
63 
64  node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
65  if (!node)
66  return 0;
67  of_node_put(node);
68 
69  pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
70  rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
71  rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
72  rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
73 
74  r = platform_device_register(&xo1_rtc_device);
75  if (r)
76  return r;
77 
78  device_init_wakeup(&xo1_rtc_device.dev, 1);
79  return 0;
80 }
81 arch_initcall(xo1_rtc_init);