1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Support for OLPC XO-1 Real Time Clock (RTC)
5 * Copyright (C) 2011 One Laptop per Child
8 #include <linux/mc146818rtc.h>
9 #include <linux/platform_device.h>
10 #include <linux/rtc.h>
15 #include <asm/x86_init.h>
17 static void rtc_wake_on(struct device *dev)
19 olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);
22 static void rtc_wake_off(struct device *dev)
24 olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);
27 static struct resource rtc_platform_resource[] = {
31 .flags = IORESOURCE_IO,
36 .flags = IORESOURCE_IRQ,
40 static struct cmos_rtc_board_info rtc_info = {
44 .wake_on = rtc_wake_on,
45 .wake_off = rtc_wake_off,
48 static struct platform_device xo1_rtc_device = {
51 .num_resources = ARRAY_SIZE(rtc_platform_resource),
52 .dev.platform_data = &rtc_info,
53 .resource = rtc_platform_resource,
56 static int __init xo1_rtc_init(void)
59 struct device_node *node;
61 node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
66 pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
67 rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
68 rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
69 rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
71 r = platform_device_register(&xo1_rtc_device);
75 x86_platform.legacy.rtc = 0;
77 device_init_wakeup(&xo1_rtc_device.dev, 1);
80 arch_initcall(xo1_rtc_init);