Hi nicolas, Can you merge this patch for adding basic cpuidle support? This may be needed for the current linaro release cycle. Regards, Amit Daniel On 10 March 2011 10:41, Amit Daniel Kachhap <amit.kach...@linaro.org> wrote:
> This patch supports cpuidle framework for samsung S5PV310. Currently, > Only one idle state is possible to use, but more idle states can > be added followed by this patch. > > Signed-off-by: Jaecheol Lee <jc....@samsung.com> > Signed-off-by: Amit Daniel Kachhap <amit.kach...@linaro.org> > --- > Rebasing the 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-s5pv310/Makefile | 1 + > arch/arm/mach-s5pv310/cpuidle.c | 87 > +++++++++++++++++++++++++++++++++++++++ > 2 files changed, 88 insertions(+), 0 deletions(-) > create mode 100644 arch/arm/mach-s5pv310/cpuidle.c > > diff --git a/arch/arm/mach-s5pv310/Makefile > b/arch/arm/mach-s5pv310/Makefile > index 036fb38..c5db0fa 100644 > --- a/arch/arm/mach-s5pv310/Makefile > +++ b/arch/arm/mach-s5pv310/Makefile > @@ -15,6 +15,7 @@ obj- := > obj-$(CONFIG_CPU_S5PV310) += cpu.o init.o clock.o irq-combiner.o > obj-$(CONFIG_CPU_S5PV310) += 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-s5pv310/cpuidle.c > b/arch/arm/mach-s5pv310/cpuidle.c > new file mode 100644 > index 0000000..f35b537 > --- /dev/null > +++ b/arch/arm/mach-s5pv310/cpuidle.c > @@ -0,0 +1,87 @@ > +/* linux/arch/arm/mach-s5pv310/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 s5pv310_enter_idle(struct cpuidle_device *dev, > + struct cpuidle_state *state); > + > +static struct cpuidle_state s5pv310_cpuidle_set[] = { > + [0] = { > + .enter = s5pv310_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, s5pv310_cpuidle_device); > + > +static struct cpuidle_driver s5pv310_idle_driver = { > + .name = "s5pv310_idle", > + .owner = THIS_MODULE, > +}; > + > +static int s5pv310_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 s5pv310_init_cpuidle(void) > +{ > + int i, max_cpuidle_state, cpu_id; > + struct cpuidle_device *device; > + > + cpuidle_register_driver(&s5pv310_idle_driver); > + > + for_each_cpu(cpu_id, cpu_online_mask) { > + device = &per_cpu(s5pv310_cpuidle_device, cpu_id); > + device->cpu = cpu_id; > + > + device->state_count = (sizeof(s5pv310_cpuidle_set) / > + sizeof(struct > cpuidle_state)); > + > + max_cpuidle_state = device->state_count; > + > + for (i = 0; i < max_cpuidle_state; i++) { > + memcpy(&device->states[i], &s5pv310_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(s5pv310_init_cpuidle); > -- > 1.7.1 > >
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