81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
// 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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rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
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rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
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rdmsrl(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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