Add common cpuidle init functionality that can be used by various imx platforms.
Signed-off-by: Robert Lee rob.lee@linaro.org --- arch/arm/plat-mxc/Makefile | 1 + arch/arm/plat-mxc/cpuidle.c | 80 ++++++++++++++++++++++++++++++ arch/arm/plat-mxc/include/mach/cpuidle.h | 22 ++++++++ 3 files changed, 103 insertions(+) create mode 100644 arch/arm/plat-mxc/cpuidle.c create mode 100644 arch/arm/plat-mxc/include/mach/cpuidle.h
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile index e81290c..63b064b 100644 --- a/arch/arm/plat-mxc/Makefile +++ b/arch/arm/plat-mxc/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_MXC_ULPI) += ulpi.o obj-$(CONFIG_MXC_USE_EPIT) += epit.o obj-$(CONFIG_MXC_DEBUG_BOARD) += 3ds_debugboard.o obj-$(CONFIG_CPU_FREQ_IMX) += cpufreq.o +obj-$(CONFIG_CPU_IDLE) += cpuidle.o ifdef CONFIG_SND_IMX_SOC obj-y += ssi-fiq.o obj-y += ssi-fiq-ksym.o diff --git a/arch/arm/plat-mxc/cpuidle.c b/arch/arm/plat-mxc/cpuidle.c new file mode 100644 index 0000000..d4cb511 --- /dev/null +++ b/arch/arm/plat-mxc/cpuidle.c @@ -0,0 +1,80 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * Copyright 2012 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 <linux/cpuidle.h> +#include <linux/err.h> +#include <linux/hrtimer.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/slab.h> + +static struct cpuidle_device __percpu * imx_cpuidle_devices; + +static void __init imx_cpuidle_devices_uninit(void) +{ + int cpu_id; + struct cpuidle_device *dev; + + for_each_possible_cpu(cpu_id) { + dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id); + cpuidle_unregister_device(dev); + } + + free_percpu(imx_cpuidle_devices); +} + +int __init imx_cpuidle_init(struct cpuidle_driver *drv) +{ + struct cpuidle_device *dev; + int cpu_id, ret; + + if (drv->state_count > CPUIDLE_STATE_MAX) { + pr_err("%s: state_count exceeds maximum\n", __func__); + return -EINVAL; + } + + ret = cpuidle_register_driver(drv); + if (ret) { + pr_err("%s: Failed to register cpuidle driver with error: %d\n", + __func__, ret); + return ret; + } + + imx_cpuidle_devices = alloc_percpu(struct cpuidle_device); + if (imx_cpuidle_devices == NULL) { + ret = -ENOMEM; + goto unregister_drv; + } + + /* initialize state data for each cpuidle_device */ + for_each_possible_cpu(cpu_id) { + dev = per_cpu_ptr(imx_cpuidle_devices, cpu_id); + dev->cpu = cpu_id; + dev->state_count = drv->state_count; + + ret = cpuidle_register_device(dev); + if (ret) { + pr_err("%s: Failed to register cpu %u, error: %d\n", + __func__, cpu_id, ret); + goto uninit; + } + } + + return 0; + +uninit: + imx_cpuidle_devices_uninit(); + +unregister_drv: + cpuidle_unregister_driver(drv); + return ret; +} diff --git a/arch/arm/plat-mxc/include/mach/cpuidle.h b/arch/arm/plat-mxc/include/mach/cpuidle.h new file mode 100644 index 0000000..bc932d1 --- /dev/null +++ b/arch/arm/plat-mxc/include/mach/cpuidle.h @@ -0,0 +1,22 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * Copyright 2012 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 <linux/cpuidle.h> + +#ifdef CONFIG_CPU_IDLE +extern int imx_cpuidle_init(struct cpuidle_driver *drv); +#else +static inline int imx_cpuidle_init(struct cpuidle_driver *drv) +{ + return -ENODEV; +} +#endif