From 449e056c76cc8c777f3f5c3fb51c197ba2300c0c Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Mon, 2 Feb 2015 16:32:45 +0100 Subject: ARM: cpuidle: Add a cpuidle ops structure to be used for DT The current state of the different cpuidle drivers is the different PM operations are passed via the platform_data using the platform driver paradigm. This approach allowed to split the low level PM code from the arch specific and the generic cpuidle code. Unfortunately there are complaints about this approach as, in the context of the single kernel image, we have multiple drivers loaded in memory for nothing and the platform driver is not adequate for cpuidle. This patch provides a common interface via cpuidle ops for all new cpuidle driver and a definition for the device tree. It will allow with the next patches to a have a common definition with ARM64 and share the same cpuidle driver. The code is optimized to use the __init section intensively in order to reduce the memory footprint after the driver is initialized and unify the function names with ARM64. Signed-off-by: Daniel Lezcano Acked-by: Kevin Hilman Acked-by: Rob Herring Acked-by: Catalin Marinas Tested-by: Lorenzo Pieralisi --- arch/arm64/include/asm/cpuidle.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/arm64') diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h index c60643f14cda..460a38bb84b9 100644 --- a/arch/arm64/include/asm/cpuidle.h +++ b/arch/arm64/include/asm/cpuidle.h @@ -17,5 +17,8 @@ static inline int cpu_suspend(unsigned long arg) return -EOPNOTSUPP; } #endif - +static inline int arm_cpuidle_suspend(int index) +{ + return cpu_suspend(index); +} #endif -- cgit v1.2.3 From c9d62161490e2b74e51bcaf2acea07e27ce833eb Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Mon, 2 Feb 2015 16:32:46 +0100 Subject: ARM64: cpuidle: Rename cpu_init_idle to a common function name With this change the cpuidle-arm64.c file calls the same function name for both ARM and ARM64. Signed-off-by: Daniel Lezcano Acked-by: Kevin Hilman Acked-by: Rob Herring Acked-by: Catalin Marinas Tested-by: Lorenzo Pieralisi --- arch/arm64/include/asm/cpuidle.h | 4 ++-- arch/arm64/kernel/cpuidle.c | 2 +- drivers/cpuidle/cpuidle-arm64.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) (limited to 'arch/arm64') diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h index 460a38bb84b9..141b2fcabaa6 100644 --- a/arch/arm64/include/asm/cpuidle.h +++ b/arch/arm64/include/asm/cpuidle.h @@ -4,10 +4,10 @@ #include #ifdef CONFIG_CPU_IDLE -extern int cpu_init_idle(unsigned int cpu); +extern int arm_cpuidle_init(unsigned int cpu); extern int cpu_suspend(unsigned long arg); #else -static inline int cpu_init_idle(unsigned int cpu) +static inline int arm_cpuidle_init(unsigned int cpu) { return -EOPNOTSUPP; } diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c index 5c0896647fd1..a78143a5c99f 100644 --- a/arch/arm64/kernel/cpuidle.c +++ b/arch/arm64/kernel/cpuidle.c @@ -15,7 +15,7 @@ #include #include -int cpu_init_idle(unsigned int cpu) +int arm_cpuidle_init(unsigned int cpu) { int ret = -EOPNOTSUPP; struct device_node *cpu_node = of_cpu_device_node_get(cpu); diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c index 0cea24410d89..6ef291c7046f 100644 --- a/drivers/cpuidle/cpuidle-arm64.c +++ b/drivers/cpuidle/cpuidle-arm64.c @@ -110,7 +110,7 @@ static int __init arm64_idle_init(void) * idle states suspend back-end specific data */ for_each_possible_cpu(cpu) { - ret = cpu_init_idle(cpu); + ret = arm_cpuidle_init(cpu); if (ret) { pr_err("CPU %d failed to init idle CPU ops\n", cpu); return ret; -- cgit v1.2.3 From 0e0870448aa134e91fafe3c39ae270561b495459 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Mon, 2 Feb 2015 16:32:46 +0100 Subject: ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64 ARM32 and ARM64 have the same DT definitions and the same approaches. The generic ARM cpuidle driver can be put in common for those two architectures. Signed-off-by: Daniel Lezcano Acked-by: Kevin Hilman Acked-by: Rob Herring Acked-by: Lorenzo Pieralisi Tested-by: Lorenzo Pieralisi --- arch/arm64/configs/defconfig | 2 +- drivers/cpuidle/Kconfig | 7 +-- drivers/cpuidle/Kconfig.arm | 28 ++++++--- drivers/cpuidle/Kconfig.arm64 | 13 ----- drivers/cpuidle/Makefile | 5 +- drivers/cpuidle/cpuidle-arm.c | 122 ++++++++++++++++++++++++++++++++++++++++ drivers/cpuidle/cpuidle-arm64.c | 122 ---------------------------------------- 7 files changed, 144 insertions(+), 155 deletions(-) delete mode 100644 drivers/cpuidle/Kconfig.arm64 create mode 100644 drivers/cpuidle/cpuidle-arm.c delete mode 100644 drivers/cpuidle/cpuidle-arm64.c (limited to 'arch/arm64') diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index be1f12a5a5f0..af6a452b1aac 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -48,7 +48,7 @@ CONFIG_CMDLINE="console=ttyAMA0" # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set CONFIG_COMPAT=y CONFIG_CPU_IDLE=y -CONFIG_ARM64_CPUIDLE=y +CONFIG_ARM_CPUIDLE=y CONFIG_NET=y CONFIG_PACKET=y CONFIG_UNIX=y diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig index c5029c1209b4..8c7930b5a65f 100644 --- a/drivers/cpuidle/Kconfig +++ b/drivers/cpuidle/Kconfig @@ -29,15 +29,10 @@ config DT_IDLE_STATES bool menu "ARM CPU Idle Drivers" -depends on ARM +depends on ARM || ARM64 source "drivers/cpuidle/Kconfig.arm" endmenu -menu "ARM64 CPU Idle Drivers" -depends on ARM64 -source "drivers/cpuidle/Kconfig.arm64" -endmenu - menu "MIPS CPU Idle Drivers" depends on MIPS source "drivers/cpuidle/Kconfig.mips" diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm index 8e07c9419153..21340e0be73e 100644 --- a/drivers/cpuidle/Kconfig.arm +++ b/drivers/cpuidle/Kconfig.arm @@ -1,10 +1,20 @@ # # ARM CPU Idle drivers # +config ARM_CPUIDLE + bool "Generic ARM/ARM64 CPU idle Driver" + select DT_IDLE_STATES + help + Select this to enable generic cpuidle driver for ARM. + It provides a generic idle driver whose idle states are configured + at run-time through DT nodes. The CPUidle suspend backend is + initialized by calling the CPU operations init idle hook + provided by architecture code. + config ARM_BIG_LITTLE_CPUIDLE bool "Support for ARM big.LITTLE processors" depends on ARCH_VEXPRESS_TC2_PM || ARCH_EXYNOS - depends on MCPM + depends on MCPM && !ARM64 select ARM_CPU_SUSPEND select CPU_IDLE_MULTIPLE_DRIVERS select DT_IDLE_STATES @@ -16,51 +26,51 @@ config ARM_BIG_LITTLE_CPUIDLE config ARM_CLPS711X_CPUIDLE bool "CPU Idle Driver for CLPS711X processors" - depends on ARCH_CLPS711X || COMPILE_TEST + depends on ARCH_CLPS711X && !ARM64 || COMPILE_TEST help Select this to enable cpuidle on Cirrus Logic CLPS711X SOCs. config ARM_HIGHBANK_CPUIDLE bool "CPU Idle Driver for Calxeda processors" - depends on ARM_PSCI + depends on ARM_PSCI && !ARM64 select ARM_CPU_SUSPEND help Select this to enable cpuidle on Calxeda processors. config ARM_KIRKWOOD_CPUIDLE bool "CPU Idle Driver for Marvell Kirkwood SoCs" - depends on MACH_KIRKWOOD + depends on MACH_KIRKWOOD && !ARM64 help This adds the CPU Idle driver for Marvell Kirkwood SoCs. config ARM_ZYNQ_CPUIDLE bool "CPU Idle Driver for Xilinx Zynq processors" - depends on ARCH_ZYNQ + depends on ARCH_ZYNQ && !ARM64 help Select this to enable cpuidle on Xilinx Zynq processors. config ARM_U8500_CPUIDLE bool "Cpu Idle Driver for the ST-E u8500 processors" - depends on ARCH_U8500 + depends on ARCH_U8500 && !ARM64 help Select this to enable cpuidle for ST-E u8500 processors config ARM_AT91_CPUIDLE bool "Cpu Idle Driver for the AT91 processors" default y - depends on ARCH_AT91 + depends on ARCH_AT91 && !ARM64 help Select this to enable cpuidle for AT91 processors config ARM_EXYNOS_CPUIDLE bool "Cpu Idle Driver for the Exynos processors" - depends on ARCH_EXYNOS + depends on ARCH_EXYNOS && !ARM64 select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP help Select this to enable cpuidle for Exynos processors config ARM_MVEBU_V7_CPUIDLE bool "CPU Idle Driver for mvebu v7 family processors" - depends on ARCH_MVEBU + depends on ARCH_MVEBU && !ARM64 help Select this to enable cpuidle on Armada 370, 38x and XP processors. diff --git a/drivers/cpuidle/Kconfig.arm64 b/drivers/cpuidle/Kconfig.arm64 deleted file mode 100644 index 6effb3656735..000000000000 --- a/drivers/cpuidle/Kconfig.arm64 +++ /dev/null @@ -1,13 +0,0 @@ -# -# ARM64 CPU Idle drivers -# - -config ARM64_CPUIDLE - bool "Generic ARM64 CPU idle Driver" - select DT_IDLE_STATES - help - Select this to enable generic cpuidle driver for ARM64. - It provides a generic idle driver whose idle states are configured - at run-time through DT nodes. The CPUidle suspend backend is - initialized by calling the CPU operations init idle hook - provided by architecture code. diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile index 4d177b916f75..3ba81b1dffad 100644 --- a/drivers/cpuidle/Makefile +++ b/drivers/cpuidle/Makefile @@ -17,15 +17,12 @@ obj-$(CONFIG_ARM_ZYNQ_CPUIDLE) += cpuidle-zynq.o obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o +obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o ############################################################################### # MIPS drivers obj-$(CONFIG_MIPS_CPS_CPUIDLE) += cpuidle-cps.o -############################################################################### -# ARM64 drivers -obj-$(CONFIG_ARM64_CPUIDLE) += cpuidle-arm64.o - ############################################################################### # POWERPC drivers obj-$(CONFIG_PSERIES_CPUIDLE) += cpuidle-pseries.o diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c new file mode 100644 index 000000000000..1c94b88a7a7d --- /dev/null +++ b/drivers/cpuidle/cpuidle-arm.c @@ -0,0 +1,122 @@ +/* + * ARM/ARM64 generic CPU idle driver. + * + * Copyright (C) 2014 ARM Ltd. + * Author: Lorenzo Pieralisi + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define pr_fmt(fmt) "CPUidle arm: " fmt + +#include +#include +#include +#include +#include +#include + +#include + +#include "dt_idle_states.h" + +/* + * arm_enter_idle_state - Programs CPU to enter the specified state + * + * dev: cpuidle device + * drv: cpuidle driver + * idx: state index + * + * Called from the CPUidle framework to program the device to the + * specified target state selected by the governor. + */ +static int arm_enter_idle_state(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int idx) +{ + int ret; + + if (!idx) { + cpu_do_idle(); + return idx; + } + + ret = cpu_pm_enter(); + if (!ret) { + /* + * Pass idle state index to cpu_suspend which in turn will + * call the CPU ops suspend protocol with idle index as a + * parameter. + */ + arm_cpuidle_suspend(idx); + + cpu_pm_exit(); + } + + return ret ? -1 : idx; +} + +static struct cpuidle_driver arm_idle_driver = { + .name = "arm_idle", + .owner = THIS_MODULE, + /* + * State at index 0 is standby wfi and considered standard + * on all ARM platforms. If in some platforms simple wfi + * can't be used as "state 0", DT bindings must be implemented + * to work around this issue and allow installing a special + * handler for idle state index 0. + */ + .states[0] = { + .enter = arm_enter_idle_state, + .exit_latency = 1, + .target_residency = 1, + .power_usage = UINT_MAX, + .name = "WFI", + .desc = "ARM WFI", + } +}; + +static const struct of_device_id arm_idle_state_match[] __initconst = { + { .compatible = "arm,idle-state", + .data = arm_enter_idle_state }, + { }, +}; + +/* + * arm_idle_init + * + * Registers the arm specific cpuidle driver with the cpuidle + * framework. It relies on core code to parse the idle states + * and initialize them using driver data structures accordingly. + */ +static int __init arm_idle_init(void) +{ + int cpu, ret; + struct cpuidle_driver *drv = &arm_idle_driver; + + /* + * Initialize idle states data, starting at index 1. + * This driver is DT only, if no DT idle states are detected (ret == 0) + * let the driver initialization fail accordingly since there is no + * reason to initialize the idle driver if only wfi is supported. + */ + ret = dt_init_idle_driver(drv, arm_idle_state_match, 1); + if (ret <= 0) + return ret ? : -ENODEV; + + /* + * Call arch CPU operations in order to initialize + * idle states suspend back-end specific data + */ + for_each_possible_cpu(cpu) { + ret = arm_cpuidle_init(cpu); + if (ret) { + pr_err("CPU %d failed to init idle CPU ops\n", cpu); + return ret; + } + } + + return cpuidle_register(drv, NULL); +} +device_initcall(arm_idle_init); diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c deleted file mode 100644 index 1c94b88a7a7d..000000000000 --- a/drivers/cpuidle/cpuidle-arm64.c +++ /dev/null @@ -1,122 +0,0 @@ -/* - * ARM/ARM64 generic CPU idle driver. - * - * Copyright (C) 2014 ARM Ltd. - * Author: Lorenzo Pieralisi - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#define pr_fmt(fmt) "CPUidle arm: " fmt - -#include -#include -#include -#include -#include -#include - -#include - -#include "dt_idle_states.h" - -/* - * arm_enter_idle_state - Programs CPU to enter the specified state - * - * dev: cpuidle device - * drv: cpuidle driver - * idx: state index - * - * Called from the CPUidle framework to program the device to the - * specified target state selected by the governor. - */ -static int arm_enter_idle_state(struct cpuidle_device *dev, - struct cpuidle_driver *drv, int idx) -{ - int ret; - - if (!idx) { - cpu_do_idle(); - return idx; - } - - ret = cpu_pm_enter(); - if (!ret) { - /* - * Pass idle state index to cpu_suspend which in turn will - * call the CPU ops suspend protocol with idle index as a - * parameter. - */ - arm_cpuidle_suspend(idx); - - cpu_pm_exit(); - } - - return ret ? -1 : idx; -} - -static struct cpuidle_driver arm_idle_driver = { - .name = "arm_idle", - .owner = THIS_MODULE, - /* - * State at index 0 is standby wfi and considered standard - * on all ARM platforms. If in some platforms simple wfi - * can't be used as "state 0", DT bindings must be implemented - * to work around this issue and allow installing a special - * handler for idle state index 0. - */ - .states[0] = { - .enter = arm_enter_idle_state, - .exit_latency = 1, - .target_residency = 1, - .power_usage = UINT_MAX, - .name = "WFI", - .desc = "ARM WFI", - } -}; - -static const struct of_device_id arm_idle_state_match[] __initconst = { - { .compatible = "arm,idle-state", - .data = arm_enter_idle_state }, - { }, -}; - -/* - * arm_idle_init - * - * Registers the arm specific cpuidle driver with the cpuidle - * framework. It relies on core code to parse the idle states - * and initialize them using driver data structures accordingly. - */ -static int __init arm_idle_init(void) -{ - int cpu, ret; - struct cpuidle_driver *drv = &arm_idle_driver; - - /* - * Initialize idle states data, starting at index 1. - * This driver is DT only, if no DT idle states are detected (ret == 0) - * let the driver initialization fail accordingly since there is no - * reason to initialize the idle driver if only wfi is supported. - */ - ret = dt_init_idle_driver(drv, arm_idle_state_match, 1); - if (ret <= 0) - return ret ? : -ENODEV; - - /* - * Call arch CPU operations in order to initialize - * idle states suspend back-end specific data - */ - for_each_possible_cpu(cpu) { - ret = arm_cpuidle_init(cpu); - if (ret) { - pr_err("CPU %d failed to init idle CPU ops\n", cpu); - return ret; - } - } - - return cpuidle_register(drv, NULL); -} -device_initcall(arm_idle_init); -- cgit v1.2.3