The driver provides a way to wake up the system by the MPIC timer.
For example,
echo 5 > /sys/devices/system/mpic/timer_wakeup
echo standby > /sys/power/state
After 5 seconds the MPIC timer will generate an interrupt to wake up
the system.
Signed-off-by: Wang Dongsheng <dongsheng.w...@freescale.com>
Signed-off-by: Zhao Chenhui <chenhui.z...@freescale.com>
Signed-off-by: Li Yang <le...@freescale.com>
---
arch/powerpc/platforms/Kconfig | 9 ++
arch/powerpc/sysdev/Makefile | 1 +
arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c | 185 +++++++++++++++++++++++++++
3 files changed, 195 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 5af04fa..487c37f 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -99,6 +99,15 @@ config MPIC_TIMER
only tested on fsl chip, but it can potentially support
other global timers complying to Open-PIC standard.
+config FSL_MPIC_TIMER_WAKEUP
+ tristate "Freescale MPIC global timer wakeup driver"
+ depends on FSL_SOC && MPIC_TIMER
+ default n
+ help
+ This is only for freescale powerpc platform. 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
bool
default n
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index ff6184a..e1b8a80 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -5,6 +5,7 @@ ccflags-$(CONFIG_PPC64) := -mno-minimal-toc
mpic-msi-obj-$(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_TIMER) += mpic_timer.o
+obj-$(CONFIG_FSL_MPIC_TIMER_WAKEUP) += fsl_mpic_timer_wakeup.o
mpic-msgr-obj-$(CONFIG_MPIC_MSGR) += mpic_msgr.o
obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y) $(mpic-msgr-obj-y)
obj-$(CONFIG_PPC_EPAPR_HV_PIC) += ehv_pic.o
diff --git a/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
b/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
new file mode 100644
index 0000000..e94ba65
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c
@@ -0,0 +1,185 @@
+/*
+ * 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>
+
+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 IRQ_HANDLED;
+}
+
+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 && !interval.tv_sec) {
+ disable_irq_wake(fsl_wakeup->timer->irq);
+ mpic_free_timer(fsl_wakeup->timer);
+ fsl_wakeup->timer = NULL;
+ mutex_unlock(&sysfs_lock);
+
+ return count;
+ }
+
+ if (fsl_wakeup->timer) {
+ mutex_unlock(&sysfs_lock);
+ return -EBUSY;
+ }
+
+ 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 bus_type mpic_subsys = {
+ .name = "mpic",
+ .dev_name = "mpic",
+};
+
+static DEVICE_ATTR(timer_wakeup, 0644,
+ fsl_timer_wakeup_show, fsl_timer_wakeup_store);
+
+static struct device_attribute *mpic_attributes[] = {
+ &dev_attr_timer_wakeup,
+ NULL
+};
+
+static int __init fsl_wakeup_sys_init(void)
+{
+ int ret;
+ int i;
+
+ 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 = subsys_system_register(&mpic_subsys, NULL);
+ if (ret)
+ goto err;
+
+ for (i = 0; mpic_attributes[i]; i++) {
+ ret = device_create_file(mpic_subsys.dev_root,
+ mpic_attributes[i]);
+ if (ret)
+ goto err2;
+ }
+
+ return ret;
+
+err2:
+ while (--i >= 0)
+ device_remove_file(mpic_subsys.dev_root, mpic_attributes[i]);
+
+ bus_unregister(&mpic_subsys);
+
+err:
+ kfree(fsl_wakeup);
+
+ return ret;
+}
+
+static void __exit fsl_wakeup_sys_exit(void)
+{
+ int i;
+
+ for (i = 0; mpic_attributes[i]; i++)
+ device_remove_file(mpic_subsys.dev_root,
+ mpic_attributes[i]);
+ bus_unregister(&mpic_subsys);
+ kfree(fsl_wakeup);
+}
+
+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.w...@freescale.com>");
--
1.7.5.1
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