From patchwork Fri Mar 18 12:51:31 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Daniel Kachhap X-Patchwork-Id: 667 Return-Path: Delivered-To: unknown Received: from imap.gmail.com (74.125.159.109) by localhost6.localdomain6 with IMAP4-SSL; 08 Jun 2011 14:44:34 -0000 Delivered-To: patches@linaro.org Received: by 10.220.28.198 with SMTP id n6cs14784vcc; Fri, 18 Mar 2011 05:51:55 -0700 (PDT) Received: by 10.204.7.8 with SMTP id b8mr940465bkb.31.1300452713926; Fri, 18 Mar 2011 05:51:53 -0700 (PDT) Received: from mail-fx0-f50.google.com (mail-fx0-f50.google.com [209.85.161.50]) by mx.google.com with ESMTPS id b24si1819676fab.149.2011.03.18.05.51.52 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 18 Mar 2011 05:51:52 -0700 (PDT) Received-SPF: pass (google.com: domain of amitdanielk@gmail.com designates 209.85.161.50 as permitted sender) client-ip=209.85.161.50; Authentication-Results: mx.google.com; spf=pass (google.com: domain of amitdanielk@gmail.com designates 209.85.161.50 as permitted sender) smtp.mail=amitdanielk@gmail.com; dkim=pass (test mode) header.i=@gmail.com Received: by fxm16 with SMTP id 16so4430043fxm.37 for ; Fri, 18 Mar 2011 05:51:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:sender:from:to:cc:subject:date:message-id :x-mailer; bh=vM0YY5rxoUGtcdnZ+KnGLsDMJJjC8mmClSRX1q5i2FQ=; b=Fi2qBYUWKh6/Z5OY+ToNM9PXi+tM1XVIO7D97XlL/mda0Abib7q0X0URuYctKczz+A FEZXjLVTug25bZ9bJ7pPCsMRb4otElKxBPnfdxkYXIhCzzACSvl0N6oZkI7fCQ/Ydc9R CBE9NbPYVRymbFYAWxP8BcQZwgRMHyn2LhpPo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:from:to:cc:subject:date:message-id:x-mailer; b=RgMvIBFtf7JpA88mgtQTvXObe0nxERFbmoEI1FkLQDMLcA54qG+WFqIT4gHOUPmw0W lvCgnsbxOJ/rq7F8a1L4UVm9jm6+LsFU0tShUYClL4PfI/WPrpfcGS6Ev9M1CEqC9u3H 0eNhZ2cO0z80XdwiXEvL+Q0ekCGegPHbXHZaY= Received: by 10.223.18.11 with SMTP id u11mr1194351faa.146.1300452682375; Fri, 18 Mar 2011 05:51:22 -0700 (PDT) Received: from localhost.localdomain ([115.113.119.130]) by mx.google.com with ESMTPS id k5sm1176347faa.39.2011.03.18.05.51.17 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 18 Mar 2011 05:51:20 -0700 (PDT) Sender: amit kachhap From: Amit Daniel Kachhap To: nicolas.pitre@linaro.org Cc: linaro-dev@lists.linaro.org, amit.kachhap@linaro.org, patches@linaro.org Subject: [PATCH V1] ARM: Samsung: Basic CPUIDLE Support Date: Fri, 18 Mar 2011 08:51:31 -0400 Message-Id: <1300452691-10637-1-git-send-email-amit.kachhap@linaro.org> X-Mailer: git-send-email 1.7.1 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 Signed-off-by: Amit Daniel Kachhap --- FIX: Fixed the merging issue reported by Nicolas Pitre 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 +#include +#include +#include + +#include + +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(struct cpuidle_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 device failed\n,"); + return -EIO; + } + } + return 0; +} + +device_initcall(exynos4_init_cpuidle);