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: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Ulf Hansson 2014-10-14 11:12:56 +02:00 committed by Linus Walleij
parent 5dcb10159b
commit cd931dcfda
4 changed files with 101 additions and 0 deletions

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@ -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

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@ -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();
}

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@ -0,0 +1,79 @@
/*
* 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;
}

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@ -0,0 +1,17 @@
/*
* 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