Jaecheol Lee 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....@samsung.com> > --- > 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 461ae57..bf206fa 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) += cpu.o init.o clock.o irq-combiner.o > obj-$(CONFIG_CPU_EXYNOS4210) += setup-i2c0.o time.o gpiolib.o irq-eint.o > dma.o > obj-$(CONFIG_CPU_FREQ) += cpufreq.o > +obj-$(CONFIG_CPU_IDLE) += cpuidle.o > > obj-$(CONFIG_SMP) += platsmp.o headsmp.o > obj-$(CONFIG_LOCAL_TIMERS) += localtimer.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(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); > -- > 1.7.1
Cc'ed Kyungmin Park. Hmm...I'm thinking that we need more discussion on this CPUIDLE later, about method, IDLE states and so on. Thanks. Best regards, Kgene. -- Kukjin Kim <kgene....@samsung.com>, Senior Engineer, SW Solution Development Team, Samsung Electronics Co., Ltd. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
