x86, olpc: Add XO-1 RTC driver

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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@ -0,0 +1,5 @@
OLPC XO-1 RTC
~~~~~~~~~~~~~
Required properties:
- compatible : "olpc,xo1-rtc"

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@ -2080,6 +2080,13 @@ config OLPC_XO1_PM
---help---
Add support for poweroff and suspend of the OLPC XO-1 laptop.
config OLPC_XO1_RTC
bool "OLPC XO-1 Real Time Clock"
depends on OLPC_XO1_PM && RTC_DRV_CMOS
---help---
Add support for the XO-1 real time clock, which can be used as a
programmable wakeup source.
config OLPC_XO1_SCI
bool "OLPC XO-1 SCI extras"
depends on OLPC && OLPC_XO1_PM && POWER_SUPPLY

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@ -1,3 +1,4 @@
obj-$(CONFIG_OLPC) += olpc.o olpc_ofw.o olpc_dt.o
obj-$(CONFIG_OLPC_XO1_PM) += olpc-xo1-pm.o xo1-wakeup.o
obj-$(CONFIG_OLPC_XO1_RTC) += olpc-xo1-rtc.o
obj-$(CONFIG_OLPC_XO1_SCI) += olpc-xo1-sci.o

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@ -0,0 +1,81 @@
/*
* 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);

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@ -40,6 +40,10 @@
#define MSR_MFGPT_NR 0x51400029
#define MSR_MFGPT_SETUP 0x5140002B
#define MSR_RTC_DOMA_OFFSET 0x51400055
#define MSR_RTC_MONA_OFFSET 0x51400056
#define MSR_RTC_CEN_OFFSET 0x51400057
#define MSR_LX_SPARE_MSR 0x80000011 /* DC-specific */
#define MSR_GX_GLD_MSR_CONFIG 0xC0002001
@ -95,6 +99,7 @@ static inline int cs5535_pic_unreqz_select_high(unsigned int group,
/* CS5536_PM1_EN bits */
#define CS5536_PM_PWRBTN (1 << 8)
#define CS5536_PM_RTC (1 << 10)
/* CS5536_PM_GPE0_STS bits */
#define CS5536_GPIOM7_PME_FLAG (1 << 31)