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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/platform/olpc/olpc-xo1-rtc.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 * Support for OLPC XO-1 Real Time Clock (RTC)

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 *

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 * Copyright (C) 2011 One Laptop per Child

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 */

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#include <linux/mc146818rtc.h>

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#include <linux/platform_device.h>

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#include <linux/rtc.h>

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#include <linux/of.h>

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#include <asm/msr.h>

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#include <asm/olpc.h>

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#include <asm/x86_init.h>

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static void rtc_wake_on(struct device *dev)

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{

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	olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);

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}

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static void rtc_wake_off(struct device *dev)

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{

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	olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);

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}

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static struct resource rtc_platform_resource[] = {

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	[0] = {

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		.start	= RTC_PORT(0),

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		.end	= RTC_PORT(1),

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		.flags	= IORESOURCE_IO,

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	},

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	[1] = {

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		.start	= RTC_IRQ,

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		.end	= RTC_IRQ,

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		.flags	= IORESOURCE_IRQ,

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	}

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};

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static struct cmos_rtc_board_info rtc_info = {

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	.rtc_day_alarm = 0,

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	.rtc_mon_alarm = 0,

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	.rtc_century = 0,

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	.wake_on = rtc_wake_on,

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	.wake_off = rtc_wake_off,

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};

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static struct platform_device xo1_rtc_device = {

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	.name = "rtc_cmos",

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	.id = -1,

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	.num_resources = ARRAY_SIZE(rtc_platform_resource),

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	.dev.platform_data = &rtc_info,

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	.resource = rtc_platform_resource,

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};

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static int __init xo1_rtc_init(void)

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{

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	int r;

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	struct device_node *node;

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	node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");

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	if (!node)

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		return 0;

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	of_node_put(node);

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	pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");

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	rdmsrq(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);

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	rdmsrq(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);

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	rdmsrq(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);

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	r = platform_device_register(&xo1_rtc_device);

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	if (r)

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		return r;

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	x86_platform.legacy.rtc = 0;

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	device_init_wakeup(&xo1_rtc_device.dev, 1);

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	return 0;

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}

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arch_initcall(xo1_rtc_init);

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