From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/arm/mach-imx/cpuidle-imx6q.c | 71 ++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 kernel/arch/arm/mach-imx/cpuidle-imx6q.c (limited to 'kernel/arch/arm/mach-imx/cpuidle-imx6q.c') diff --git a/kernel/arch/arm/mach-imx/cpuidle-imx6q.c b/kernel/arch/arm/mach-imx/cpuidle-imx6q.c new file mode 100644 index 000000000..8e21ccc1e --- /dev/null +++ b/kernel/arch/arm/mach-imx/cpuidle-imx6q.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2012 Freescale Semiconductor, Inc. + * + * 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 "common.h" +#include "cpuidle.h" +#include "hardware.h" + +static atomic_t master = ATOMIC_INIT(0); +static DEFINE_SPINLOCK(master_lock); + +static int imx6q_enter_wait(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + if (atomic_inc_return(&master) == num_online_cpus()) { + /* + * With this lock, we prevent other cpu to exit and enter + * this function again and become the master. + */ + if (!spin_trylock(&master_lock)) + goto idle; + imx6q_set_lpm(WAIT_UNCLOCKED); + cpu_do_idle(); + imx6q_set_lpm(WAIT_CLOCKED); + spin_unlock(&master_lock); + goto done; + } + +idle: + cpu_do_idle(); +done: + atomic_dec(&master); + + return index; +} + +static struct cpuidle_driver imx6q_cpuidle_driver = { + .name = "imx6q_cpuidle", + .owner = THIS_MODULE, + .states = { + /* WFI */ + ARM_CPUIDLE_WFI_STATE, + /* WAIT */ + { + .exit_latency = 50, + .target_residency = 75, + .flags = CPUIDLE_FLAG_TIMER_STOP, + .enter = imx6q_enter_wait, + .name = "WAIT", + .desc = "Clock off", + }, + }, + .state_count = 2, + .safe_state_index = 0, +}; + +int __init imx6q_cpuidle_init(void) +{ + /* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */ + imx6q_set_int_mem_clk_lpm(true); + + return cpuidle_register(&imx6q_cpuidle_driver, NULL); +} -- cgit 1.2.3-korg