ARM: mach-shmobile: CPUIdle support (0af4817b) · Commits · 戴 / test

arch/arm/mach-shmobile/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,7 @@ obj-$(CONFIG_ARCH_SH73A0) += entry-gic.o

		# PM objects
		obj-$(CONFIG_SUSPEND) += suspend.o
		obj-$(CONFIG_CPU_IDLE) += cpuidle.o
		obj-$(CONFIG_ARCH_SH7372) += pm-sh7372.o sleep-sh7372.o

		# Board objects

arch/arm/mach-shmobile/cpuidle.c

0 → 100644

+92 −0

Original line number	Diff line number	Diff line
		/*
		* CPUIdle support code for SH-Mobile ARM
		*
		* Copyright (C) 2011 Magnus Damm
		*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*/

		#include <linux/pm.h>
		#include <linux/cpuidle.h>
		#include <linux/suspend.h>
		#include <linux/module.h>
		#include <linux/err.h>
		#include <asm/system.h>
		#include <asm/io.h>

		static void shmobile_enter_wfi(void)
		{
		cpu_do_idle();
		}

		void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
		shmobile_enter_wfi, /* regular sleep mode */
		};

		static int shmobile_cpuidle_enter(struct cpuidle_device *dev,
		struct cpuidle_state *state)
		{
		ktime_t before, after;
		int requested_state = state - &dev->states[0];

		dev->last_state = &dev->states[requested_state];
		before = ktime_get();

		local_irq_disable();
		local_fiq_disable();

		shmobile_cpuidle_modes[requested_state]();

		local_irq_enable();
		local_fiq_enable();

		after = ktime_get();
		return ktime_to_ns(ktime_sub(after, before)) >> 10;
		}

		static struct cpuidle_device shmobile_cpuidle_dev;
		static struct cpuidle_driver shmobile_cpuidle_driver = {
		.name = "shmobile_cpuidle",
		.owner = THIS_MODULE,
		};

		void (shmobile_cpuidle_setup)(struct cpuidle_device dev);

		static int shmobile_cpuidle_init(void)
		{
		struct cpuidle_device *dev = &shmobile_cpuidle_dev;
		struct cpuidle_state *state;
		int i;

		cpuidle_register_driver(&shmobile_cpuidle_driver);

		for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
		dev->states[i].name[0] = '\0';
		dev->states[i].desc[0] = '\0';
		dev->states[i].enter = shmobile_cpuidle_enter;
		}

		i = CPUIDLE_DRIVER_STATE_START;

		state = &dev->states[i++];
		snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
		strncpy(state->desc, "WFI", CPUIDLE_DESC_LEN);
		state->exit_latency = 1;
		state->target_residency = 1 * 2;
		state->power_usage = 3;
		state->flags = 0;
		state->flags \|= CPUIDLE_FLAG_TIME_VALID;

		dev->safe_state = state;
		dev->state_count = i;

		if (shmobile_cpuidle_setup)
		shmobile_cpuidle_setup(dev);

		cpuidle_register_device(dev);

		return 0;
		}
		late_initcall(shmobile_cpuidle_init);

arch/arm/mach-shmobile/include/mach/common.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -9,6 +9,9 @@ extern int clk_init(void);
		extern void shmobile_handle_irq_intc(struct pt_regs *);
		extern void shmobile_handle_irq_gic(struct pt_regs *);
		extern struct platform_suspend_ops shmobile_suspend_ops;
		struct cpuidle_device;
		extern void (*shmobile_cpuidle_modes[])(void);
		extern void (shmobile_cpuidle_setup)(struct cpuidle_device dev);

		extern void sh7367_init_irq(void);
		extern void sh7367_add_early_devices(void);

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