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x86, olpc: Add XO-1 RTC driver

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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>
This commit is contained in:
Daniel Drake
2011-06-25 17:34:17 +01:00
committed by H. Peter Anvin
parent e1040ac693
commit cfee95977b
5 changed files with 99 additions and 0 deletions
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81
arch/x86/platform/olpc/olpc-xo1-rtc.c Normal file
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/*
* Support for OLPC XO-1 Real Time Clock (RTC)
*
* Copyright (C) 2011 One Laptop per Child
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/mc146818rtc.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/of.h>
#include <asm/msr.h>
#include <asm/olpc.h>
static void rtc_wake_on(struct device *dev)
{
olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);
}
static void rtc_wake_off(struct device *dev)
{
olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);
}
static struct resource rtc_platform_resource[] = {
[0] = {
.start = RTC_PORT(0),
.end = RTC_PORT(1),
.flags = IORESOURCE_IO,
},
[1] = {
.start = RTC_IRQ,
.end = RTC_IRQ,
.flags = IORESOURCE_IRQ,
}
};
static struct cmos_rtc_board_info rtc_info = {
.rtc_day_alarm = 0,
.rtc_mon_alarm = 0,
.rtc_century = 0,
.wake_on = rtc_wake_on,
.wake_off = rtc_wake_off,
};
static struct platform_device xo1_rtc_device = {
.name = "rtc_cmos",
.id = -1,
.num_resources = ARRAY_SIZE(rtc_platform_resource),
.dev.platform_data = &rtc_info,
.resource = rtc_platform_resource,
};
static int __init xo1_rtc_init(void)
{
int r;
struct device_node *node;
node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
if (!node)
return 0;
of_node_put(node);
pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
r = platform_device_register(&xo1_rtc_device);
if (r)
return r;
device_init_wakeup(&xo1_rtc_device.dev, 1);
return 0;
}
arch_initcall(xo1_rtc_init);