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cfee95977b
Add a driver to configure the XO-1 RTC via CS5536 MSRs, to be used as a system wakeup source via olpc-xo1-pm. Device detection is based on finding the relevant device tree node. Signed-off-by: Daniel Drake <dsd@laptop.org> Link: http://lkml.kernel.org/r/1309019658-1712-11-git-send-email-dsd@laptop.org Acked-by: Andres Salomon <dilinger@queued.net> Acked-by: Grant Likely <grant.likely@secretlab.ca> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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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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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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