mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 12:56:55 +07:00
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>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
|
|
* 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);
|