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Commit cd931dcf authored by Ulf Hansson's avatar Ulf Hansson Committed by Linus Walleij
Browse files

ARM: ux500: Initial support for PM domains 



The ux500 SoC uses the generic PM domain and requires the domains to be
specified through DT.

Currently the genpd callbacks for handling power gating|ungating are
implemented as dummy functions. To be able to enable those to perform
PM domain gating/ungating, each device that resides in the VAPE domain
must be properly handled from a runtime PM perspective.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 5dcb1015

arch/arm/mach-ux500/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -9,5 +9,6 @@ obj-$(CONFIG_MACH_MOP500) += board-mop500-regulators.o \ 
				board-mop500-audio.o

obj-$(CONFIG_SMP)		+= platsmp.o headsmp.o

obj-$(CONFIG_HOTPLUG_CPU)	+= hotplug.o

obj-$(CONFIG_PM_GENERIC_DOMAINS) += pm_domains.o



CFLAGS_hotplug.o		+= -march=armv7-a

arch/arm/mach-ux500/pm.c

+4 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/platform_data/arm-ux500-pm.h>



#include "db8500-regs.h"

#include "pm_domains.h"



/* ARM WFI Standby signal register */

#define PRCM_ARM_WFI_STANDBY    (prcmu_base + 0x130)
@@ -191,4 +192,7 @@ void __init ux500_pm_init(u32 phy_base, u32 size) 


	/* Set up ux500 suspend callbacks. */

	suspend_set_ops(UX500_SUSPEND_OPS);



	/* Initialize ux500 power domains */

	ux500_pm_domains_init();

}

arch/arm/mach-ux500/pm_domains.c

0 → 100644
+79 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Linaro Ltd.

 *

 * Author: Ulf Hansson <ulf.hansson@linaro.org>

 * License terms: GNU General Public License (GPL) version 2

 *

 * Implements PM domains using the generic PM domain for ux500.

 */

#include <linux/printk.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/pm_domain.h>



#include <dt-bindings/arm/ux500_pm_domains.h>

#include "pm_domains.h"



static int pd_power_off(struct generic_pm_domain *domain)

{

	/*

	 * Handle the gating of the PM domain regulator here.

	 *

	 * Drivers/subsystems handling devices in the PM domain needs to perform

	 * register context save/restore from their respective runtime PM

	 * callbacks, to be able to enable PM domain gating/ungating.

	 */

	return 0;

}



static int pd_power_on(struct generic_pm_domain *domain)

{

	/*

	 * Handle the ungating of the PM domain regulator here.

	 *

	 * Drivers/subsystems handling devices in the PM domain needs to perform

	 * register context save/restore from their respective runtime PM

	 * callbacks, to be able to enable PM domain gating/ungating.

	 */

	return 0;

}



static struct generic_pm_domain ux500_pm_domain_vape = {

	.name = "VAPE",

	.power_off = pd_power_off,

	.power_on = pd_power_on,

};



static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {

	[DOMAIN_VAPE] = &ux500_pm_domain_vape,

};



static struct of_device_id ux500_pm_domain_matches[] = {

	{ .compatible = "stericsson,ux500-pm-domains", },

	{ },

};



int __init ux500_pm_domains_init(void)

{

	struct device_node *np;

	struct genpd_onecell_data *genpd_data;

	int i;



	np = of_find_matching_node(NULL, ux500_pm_domain_matches);

	if (!np)

		return -ENODEV;



	genpd_data = kzalloc(sizeof(*genpd_data), GFP_KERNEL);

	if (!genpd_data)

		return -ENOMEM;



	genpd_data->domains = ux500_pm_domains;

	genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);



	for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)

		pm_genpd_init(ux500_pm_domains[i], NULL, false);



	of_genpd_add_provider_onecell(np, genpd_data);

	return 0;

}

arch/arm/mach-ux500/pm_domains.h

0 → 100644
+17 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 Linaro Ltd.

 *

 * Author: Ulf Hansson <ulf.hansson@linaro.org>

 * License terms: GNU General Public License (GPL) version 2

 */



#ifndef __MACH_UX500_PM_DOMAINS_H

#define __MACH_UX500_PM_DOMAINS_H



#ifdef CONFIG_PM_GENERIC_DOMAINS

extern int __init ux500_pm_domains_init(void);

#else

static inline int ux500_pm_domains_init(void) { return 0; }

#endif



#endif