Hi Nicolas,
Please take this cpuidle commit from the samsung tree needed for Linaro new rebuilt tree.
http://git.kernel.org/?p=linux/kernel/git/kgene/linux-samsung.git%3Ba=commit...
Thanks, Amit Daniel
On 18 March 2011 08:51, Amit Daniel Kachhap amit.kachhap@linaro.org wrote:
This patch supports cpuidle framework for EXYNOS4210. Currently, Only one idle state is possible to use, but more idle states can be added following by this patch.
Signed-off-by: Jaecheol Lee jc.lee@samsung.com Signed-off-by: Amit Daniel Kachhap amit.kachhap@linaro.org
FIX: Fixed the merging issue reported by Nicolas Pitre < nicolas.pitre@linaro.org>
Sending the rebased patch for linaro 2.6.38 kernel. This patch adds basic cpuidle infrastructure and fixes the launchpad bug(bug id: 723543). This patch is under review in samsung mailing list. http://www.spinics.net/lists/linux-samsung-soc/msg04268.html
arch/arm/mach-exynos4/Makefile | 1 + arch/arm/mach-exynos4/cpuidle.c | 87 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-exynos4/cpuidle.c
diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile index b8f0e7d..f8a3a74 100644 --- a/arch/arm/mach-exynos4/Makefile +++ b/arch/arm/mach-exynos4/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_CPU_EXYNOS4210) += cpu.o init.o clock.o irq-combiner.o obj-$(CONFIG_CPU_EXYNOS4210) += setup-i2c0.o gpiolib.o irq-eint.o dma.o obj-$(CONFIG_PM) += pm.o sleep.o obj-$(CONFIG_CPU_FREQ) += cpufreq.o +obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
diff --git a/arch/arm/mach-exynos4/cpuidle.c b/arch/arm/mach-exynos4/cpuidle.c new file mode 100644 index 0000000..a543a18 --- /dev/null +++ b/arch/arm/mach-exynos4/cpuidle.c @@ -0,0 +1,87 @@ +/* linux/arch/arm/mach-exynos4/cpuidle.c
- Copyright (c) 2011 Samsung Electronics Co., Ltd.
http://www.samsung.com
- 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.
+*/
+#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/cpuidle.h> +#include <linux/io.h>
+#include <asm/proc-fns.h>
+static int exynos4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_state *state);+static struct cpuidle_state exynos4_cpuidle_set[] = {
[0] = {.enter = exynos4_enter_idle,.exit_latency = 1,.target_residency = 100000,.flags = CPUIDLE_FLAG_TIME_VALID,.name = "IDLE",.desc = "ARM clock gating(WFI)",},+};
+static DEFINE_PER_CPU(struct cpuidle_device, exynos4_cpuidle_device);
+static struct cpuidle_driver exynos4_idle_driver = {
.name = "exynos4_idle",.owner = THIS_MODULE,+};
+static int exynos4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_state *state)+{
struct timeval before, after;int idle_time;local_irq_disable();do_gettimeofday(&before);cpu_do_idle();do_gettimeofday(&after);local_irq_enable();idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +(after.tv_usec - before.tv_usec);return idle_time;+}
+static int __init exynos4_init_cpuidle(void) +{
int i, max_cpuidle_state, cpu_id;struct cpuidle_device *device;cpuidle_register_driver(&exynos4_idle_driver);for_each_cpu(cpu_id, cpu_online_mask) {device = &per_cpu(exynos4_cpuidle_device, cpu_id);device->cpu = cpu_id;device->state_count = (sizeof(exynos4_cpuidle_set) /sizeof(structcpuidle_state));
max_cpuidle_state = device->state_count;for (i = 0; i < max_cpuidle_state; i++) {memcpy(&device->states[i], &exynos4_cpuidle_set[i],sizeof(struct cpuidle_state));}if (cpuidle_register_device(device)) {printk(KERN_ERR "CPUidle register devicefailed\n,");
return -EIO;}}return 0;+}
+device_initcall(exynos4_init_cpuidle);
1.7.1