powerpc/fsl: add MPIC timer wakeup support (a63b3bc7) · Commits · 戴 / test

arch/powerpc/platforms/Kconfig

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -98,6 +98,15 @@ config MPIC_TIMER
	chip, but it can potentially support other global timers		chip, but it can potentially support other global timers
	complying with the OpenPIC standard.		complying with the OpenPIC standard.

			config FSL_MPIC_TIMER_WAKEUP
			tristate "Freescale MPIC global timer wakeup driver"
			depends on FSL_SOC && MPIC_TIMER && PM
			default n
			help
			The driver provides a way to wake up the system by MPIC
			timer.
			e.g. "echo 5 > /sys/devices/system/mpic/timer_wakeup"

	config PPC_EPAPR_HV_PIC		config PPC_EPAPR_HV_PIC
	bool		bool
	default n		default n

arch/powerpc/sysdev/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -5,6 +5,7 @@ ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
	mpic-msi-obj-$(CONFIG_PCI_MSI) += mpic_msi.o mpic_u3msi.o mpic_pasemi_msi.o		mpic-msi-obj-$(CONFIG_PCI_MSI) += mpic_msi.o mpic_u3msi.o mpic_pasemi_msi.o
	obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y)		obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y)
	obj-$(CONFIG_MPIC_TIMER) += mpic_timer.o		obj-$(CONFIG_MPIC_TIMER) += mpic_timer.o
			obj-$(CONFIG_FSL_MPIC_TIMER_WAKEUP) += fsl_mpic_timer_wakeup.o
	mpic-msgr-obj-$(CONFIG_MPIC_MSGR) += mpic_msgr.o		mpic-msgr-obj-$(CONFIG_MPIC_MSGR) += mpic_msgr.o
	obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y) $(mpic-msgr-obj-y)		obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y) $(mpic-msgr-obj-y)
	obj-$(CONFIG_PPC_EPAPR_HV_PIC) += ehv_pic.o		obj-$(CONFIG_PPC_EPAPR_HV_PIC) += ehv_pic.o

arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c

0 → 100644

+161 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* MPIC timer wakeup driver
			*
			* Copyright 2013 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 as published by the
			* Free Software Foundation; either version 2 of the License, or (at your
			* option) any later version.
			*/

			#include <linux/kernel.h>
			#include <linux/slab.h>
			#include <linux/errno.h>
			#include <linux/module.h>
			#include <linux/interrupt.h>
			#include <linux/device.h>

			#include <asm/mpic_timer.h>
			#include <asm/mpic.h>

			struct fsl_mpic_timer_wakeup {
			struct mpic_timer *timer;
			struct work_struct free_work;
			};

			static struct fsl_mpic_timer_wakeup *fsl_wakeup;
			static DEFINE_MUTEX(sysfs_lock);

			static void fsl_free_resource(struct work_struct *ws)
			{
			struct fsl_mpic_timer_wakeup *wakeup =
			container_of(ws, struct fsl_mpic_timer_wakeup, free_work);

			mutex_lock(&sysfs_lock);

			if (wakeup->timer) {
			disable_irq_wake(wakeup->timer->irq);
			mpic_free_timer(wakeup->timer);
			}

			wakeup->timer = NULL;
			mutex_unlock(&sysfs_lock);
			}

			static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id)
			{
			struct fsl_mpic_timer_wakeup *wakeup = dev_id;

			schedule_work(&wakeup->free_work);

			return wakeup->timer ? IRQ_HANDLED : IRQ_NONE;
			}

			static ssize_t fsl_timer_wakeup_show(struct device *dev,
			struct device_attribute *attr,
			char *buf)
			{
			struct timeval interval;
			int val = 0;

			mutex_lock(&sysfs_lock);
			if (fsl_wakeup->timer) {
			mpic_get_remain_time(fsl_wakeup->timer, &interval);
			val = interval.tv_sec + 1;
			}
			mutex_unlock(&sysfs_lock);

			return sprintf(buf, "%d\n", val);
			}

			static ssize_t fsl_timer_wakeup_store(struct device *dev,
			struct device_attribute *attr,
			const char *buf,
			size_t count)
			{
			struct timeval interval;
			int ret;

			interval.tv_usec = 0;
			if (kstrtol(buf, 0, &interval.tv_sec))
			return -EINVAL;

			mutex_lock(&sysfs_lock);

			if (fsl_wakeup->timer) {
			disable_irq_wake(fsl_wakeup->timer->irq);
			mpic_free_timer(fsl_wakeup->timer);
			fsl_wakeup->timer = NULL;
			}

			if (!interval.tv_sec) {
			mutex_unlock(&sysfs_lock);
			return count;
			}

			fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq,
			fsl_wakeup, &interval);
			if (!fsl_wakeup->timer) {
			mutex_unlock(&sysfs_lock);
			return -EINVAL;
			}

			ret = enable_irq_wake(fsl_wakeup->timer->irq);
			if (ret) {
			mpic_free_timer(fsl_wakeup->timer);
			fsl_wakeup->timer = NULL;
			mutex_unlock(&sysfs_lock);

			return ret;
			}

			mpic_start_timer(fsl_wakeup->timer);

			mutex_unlock(&sysfs_lock);

			return count;
			}

			static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644,
			fsl_timer_wakeup_show, fsl_timer_wakeup_store);

			static int __init fsl_wakeup_sys_init(void)
			{
			int ret;

			fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL);
			if (!fsl_wakeup)
			return -ENOMEM;

			INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource);

			ret = device_create_file(mpic_subsys.dev_root, &mpic_attributes);
			if (ret)
			kfree(fsl_wakeup);

			return ret;
			}

			static void __exit fsl_wakeup_sys_exit(void)
			{
			device_remove_file(mpic_subsys.dev_root, &mpic_attributes);

			mutex_lock(&sysfs_lock);

			if (fsl_wakeup->timer) {
			disable_irq_wake(fsl_wakeup->timer->irq);
			mpic_free_timer(fsl_wakeup->timer);
			}

			kfree(fsl_wakeup);

			mutex_unlock(&sysfs_lock);
			}

			module_init(fsl_wakeup_sys_init);
			module_exit(fsl_wakeup_sys_exit);

			MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver");
			MODULE_LICENSE("GPL v2");
			MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");

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