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Date: Mon, 16 Apr 2012 18:50:12 -0500
From: Robert Lee <rob.lee@...aro.org>
To: kernel@...gutronix.de
Cc: shawn.guo@...aro.org, amit.kucheria@...aro.org,
daniel.lezcano@...aro.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
patches@...aro.org
Subject: [PATCH 1/3] ARM: imx: Add common imx cpuidle init functionality.
Add common cpuidle init functionality that can be used by various
imx platforms.
Signed-off-by: Robert Lee <rob.lee@...aro.org>
---
arch/arm/plat-mxc/Makefile | 2 +
arch/arm/plat-mxc/cpuidle.c | 89 ++++++++++++++++++++++++++++++
arch/arm/plat-mxc/include/mach/cpuidle.h | 26 +++++++++
3 files changed, 117 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..7c9e05f 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -16,6 +16,8 @@ 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..d1c9301
--- /dev/null
+++ b/arch/arm/plat-mxc/cpuidle.c
@@ -0,0 +1,89 @@
+/*
+ * 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/kernel.h>
+#include <linux/io.h>
+#include <linux/cpuidle.h>
+#include <linux/hrtimer.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+static struct cpuidle_device __percpu * imx_cpuidle_devices;
+static struct cpuidle_driver *drv;
+
+void __init imx_cpuidle_set_driver(struct cpuidle_driver *p)
+{
+ drv = p;
+}
+
+void 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);
+}
+
+static int __init imx_cpuidle_init(void)
+{
+ struct cpuidle_device *dev;
+ int cpu_id, ret;
+
+ if (!drv || drv->state_count > CPUIDLE_STATE_MAX) {
+ pr_err("%s: Invalid Input\n", __func__);
+ return -EINVAL;
+ }
+
+ ret = cpuidle_register_driver(drv);
+
+ if (ret) {
+ pr_err("%s: Failed to register cpuidle driver\n", __func__);
+ 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\n",
+ __func__, cpu_id);
+ goto uninit;
+ }
+ }
+
+ return 0;
+
+uninit:
+ imx_cpuidle_devices_uninit();
+
+unregister_drv:
+ cpuidle_unregister_driver(drv);
+
+ return ret;
+}
+late_initcall(imx_cpuidle_init);
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..6509f19
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/cpuidle.h
@@ -0,0 +1,26 @@
+/*
+ * 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>
+
+extern int imx5_cpuidle_init(void);
+extern int imx6q_cpuidle_init(void);
+
+#ifdef CONFIG_CPU_IDLE
+extern void imx_cpuidle_devices_uninit(void);
+extern void imx_cpuidle_set_driver(struct cpuidle_driver *p);
+extern int imx5_cpuidle_init(void);
+extern int imx6q_cpuidle_init(void);
+#else
+static inline void imx_cpuidle_devices_uninit(void) {}
+static inline void imx_cpuidle_set_driver(struct cpuidle_driver *p) {}
+#endif
--
1.7.10
--
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