On 7/7/2011 8:50 AM, Lorenzo Pieralisi wrote:
From: Colin Crossccross@android.com
During some CPU power modes entered during idle, hotplug and suspend, peripherals located in the CPU power domain, such as the GIC and VFP, may be powered down. Add a notifier chain that allows drivers for those peripherals to be notified before and after they may be reset.
Signed-off-by: Colin Crossccross@android.com Tested-by: Kevin Hilmankhilman@ti.com
arch/arm/Kconfig | 7 ++ arch/arm/include/asm/cpu_pm.h | 54 ++++++++++++ arch/arm/kernel/Makefile | 1 + arch/arm/kernel/cpu_pm.c | 181 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 243 insertions(+), 0 deletions(-) create mode 100644 arch/arm/include/asm/cpu_pm.h create mode 100644 arch/arm/kernel/cpu_pm.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9adc278..356f266 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -183,6 +183,13 @@ config FIQ config ARCH_MTD_XIP bool
+config ARCH_USES_CPU_PM
bool+config CPU_PM
def_bool ydepends on ARCH_USES_CPU_PM&& (PM || CPU_IDLE)- config VECTORS_BASE hex default 0xffff0000 if MMU || CPU_HIGH_VECTOR
diff --git a/arch/arm/include/asm/cpu_pm.h b/arch/arm/include/asm/cpu_pm.h new file mode 100644 index 0000000..b4bb715 --- /dev/null +++ b/arch/arm/include/asm/cpu_pm.h @@ -0,0 +1,54 @@ +/*
- Copyright (C) 2011 Google, Inc.
- Author:
- Colin Crossccross@android.com
- This software is licensed under the terms of the GNU General Public
- License version 2, as published by the Free Software Foundation, and
- may be copied, distributed, and modified under those terms.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- */
+#ifndef _ASMARM_CPU_PM_H +#define _ASMARM_CPU_PM_H
+#include<linux/kernel.h> +#include<linux/notifier.h>
+/* Event codes passed as unsigned long val to notifier calls */ +enum cpu_pm_event {
- /* A single cpu is entering a low power state */
- CPU_PM_ENTER,
- /* A single cpu failed to enter a low power state */
- CPU_PM_ENTER_FAILED,
- /* A single cpu is exiting a low power state */
- CPU_PM_EXIT,
- /* A cpu power domain is entering a low power state */
- CPU_COMPLEX_PM_ENTER,
- /* A cpu power domain failed to enter a low power state */
- CPU_COMPLEX_PM_ENTER_FAILED,
- /* A cpu power domain is exiting a low power state */
- CPU_COMPLEX_PM_EXIT,
+};
+int cpu_pm_register_notifier(struct notifier_block *nb); +int cpu_pm_unregister_notifier(struct notifier_block *nb);
+int cpu_pm_enter(void); +int cpu_pm_exit(void);
+int cpu_complex_pm_enter(void); +int cpu_complex_pm_exit(void);
Can "cpu_complex_pm*" renamed to "cpu_cluster_pm*" as discussed earlier on the list.
Regards Santosh