From patchwork Tue Dec 6 04:38:11 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [RFC,8/8] ARM: imx: Add mx5 cpuidle implmentation From: Robert Lee X-Patchwork-Id: 129532 Message-Id: <1323146291-10676-9-git-send-email-rob.lee@linaro.org> To: linux@arm.linux.org.uk, s.hauer@pengutronix.de Cc: khilman@ti.com, kgene.kim@samsung.com, mturquette@linaro.org, patches@linaro.org, nicolas.ferre@atmel.com, daniel.lezcano@linaro.org, magnus.damm@gmail.com, nsekhar@ti.com, amit.kachhap@linaro.org, amit.kucheria@linaro.org, vincent.guittot@linaro.org, arnd.bergmann@linaro.org, linux@maxim.org.za, shawn.guo@freescale.com, linux-arm-kernel@lists.infradead.org Date: Mon, 5 Dec 2011 22:38:11 -0600 Add mx5 cpuidle implmentation based upon the common ARM cpuidle initialization code. Signed-off-by: Robert Lee --- arch/arm/mach-mx5/Makefile | 3 +- arch/arm/mach-mx5/cpuidle.c | 59 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 61 insertions(+), 1 deletions(-) create mode 100644 arch/arm/mach-mx5/cpuidle.c diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile index 0fc6080..2c348b4 100644 --- a/arch/arm/mach-mx5/Makefile +++ b/arch/arm/mach-mx5/Makefile @@ -3,8 +3,9 @@ # # Object file lists. -obj-y := cpu.o mm.o clock-mx51-mx53.o ehci.o system.o +obj-y := cpu.o mm.o clock-mx51-mx53.o ehci.o system.o +obj-$(CONFIG_CPU_IDLE) += cpuidle.o obj-$(CONFIG_PM) += pm-imx5.o obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o diff --git a/arch/arm/mach-mx5/cpuidle.c b/arch/arm/mach-mx5/cpuidle.c new file mode 100644 index 0000000..3584df5 --- /dev/null +++ b/arch/arm/mach-mx5/cpuidle.c @@ -0,0 +1,59 @@ +/* + * Copyright 2011 Freescale Semiconductor, Inc. + * Copyright 2011 Linaro Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include +#include +#include +#include +#include +#include + +static struct cpuidle_driver imx5_cpuidle_driver = { + .name = "imx5_cpuidle", + .owner = THIS_MODULE, + .states[0] = { + .exit_latency = 12, + .flags = CPUIDLE_FLAG_TIME_VALID, + .name = "WFI", + .desc = "idle cpu powered, unclocked.", + }, + .states[1] = { + .exit_latency = 20, + .flags = CPUIDLE_FLAG_TIME_VALID, + .name = "WFI SRPG", + .desc = "idle cpu unpowered, unclocked.", + }, + .state_count = 2, +}; + +int imx5_enter_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + if (likely(index)) + mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF); + else + mx5_cpu_lp_set(WAIT_UNCLOCKED); + cpu_do_idle(); + return index; +} + +static int __init imx5_init_cpuidle(void) +{ + int ret; + + ret = arm_cpuidle_init(&imx5_cpuidle_driver, + imx5_enter_idle, + NULL); + return ret; +} +late_initcall(imx5_init_cpuidle);