Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit cfee9597 authored by Daniel Drake's avatar Daniel Drake Committed by H. Peter Anvin
Browse files

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: default avatarDaniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-11-git-send-email-dsd@laptop.org


Acked-by: default avatarAndres Salomon <dilinger@queued.net>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Reviewed-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent e1040ac6

Documentation/devicetree/bindings/rtc/olpc-xo1-rtc.txt

0 → 100644
+5 −0
Original line number Original line Diff line number Diff line 
OLPC XO-1 RTC

~~~~~~~~~~~~~



Required properties:

 - compatible : "olpc,xo1-rtc"

arch/x86/Kconfig

+7 −0
Original line number Original line Diff line number Diff line
@@ -2080,6 +2080,13 @@ config OLPC_XO1_PM 
	---help---

	---help---

	  Add support for poweroff and suspend of the OLPC XO-1 laptop.

	  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

config OLPC_XO1_SCI

	bool "OLPC XO-1 SCI extras"

	bool "OLPC XO-1 SCI extras"

	depends on OLPC && OLPC_XO1_PM && POWER_SUPPLY

	depends on OLPC && OLPC_XO1_PM && POWER_SUPPLY

arch/x86/platform/olpc/Makefile

+1 −0
Original line number Original line Diff line number Diff line 
obj-$(CONFIG_OLPC)		+= olpc.o olpc_ofw.o olpc_dt.o

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_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
 
obj-$(CONFIG_OLPC_XO1_SCI)	+= olpc-xo1-sci.o

arch/x86/platform/olpc/olpc-xo1-rtc.c

0 → 100644
+81 −0
Original line number Original line Diff line number Diff line 
/*

 * 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);

include/linux/cs5535.h

+5 −0
Original line number Original line Diff line number Diff line
@@ -40,6 +40,10 @@ 
#define MSR_MFGPT_NR		0x51400029

#define MSR_MFGPT_NR		0x51400029

#define MSR_MFGPT_SETUP		0x5140002B

#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_LX_SPARE_MSR	0x80000011	/* DC-specific */





#define MSR_GX_GLD_MSR_CONFIG	0xC0002001

#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 */

/* CS5536_PM1_EN bits */

#define CS5536_PM_PWRBTN	(1 << 8)

#define CS5536_PM_PWRBTN	(1 << 8)

#define CS5536_PM_RTC		(1 << 10)





/* CS5536_PM_GPE0_STS bits */

/* CS5536_PM_GPE0_STS bits */

#define CS5536_GPIOM7_PME_FLAG	(1 << 31)

#define CS5536_GPIOM7_PME_FLAG	(1 << 31)