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Message-Id: <1302134569-22825-5-git-send-email-khilman@ti.com>
Date: Wed, 6 Apr 2011 17:02:47 -0700
From: Kevin Hilman <khilman@...com>
To: linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
linux-sh@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Magnus Damm <magnus.damm@...il.com>,
"Rafael J. Wysocki" <rjw@...e.com>,
Grant Likely <grant.likely@...retlab.ca>,
Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH/RFC 4/6] ARM: move SH-mobile runtime PM to arm/common for sharing with other platforms
There is really nothing SH-mobile specific about this runtime PM
implementation. Any platform wanting to implement runtime PM based on
simple clock gating can use this implementation.
Signed-off-by: Kevin Hilman <khilman@...com>
---
arch/arm/common/Makefile | 1 +
arch/arm/common/pm_runtime_clock.c | 176 ++++++++++++++++++++++++++++++++++
arch/arm/include/asm/pm_runtime.h | 17 ++++
arch/arm/mach-shmobile/pm_runtime.c | 179 -----------------------------------
4 files changed, 194 insertions(+), 179 deletions(-)
create mode 100644 arch/arm/common/pm_runtime_clock.c
create mode 100644 arch/arm/include/asm/pm_runtime.h
delete mode 100644 arch/arm/mach-shmobile/pm_runtime.c
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index e7521bca..efa79c7 100644
--- a/arch/arm/common/Makefile
+++ b/arch/arm/common/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_ARCH_IXP23XX) += uengine.o
obj-$(CONFIG_PCI_HOST_ITE8152) += it8152.o
obj-$(CONFIG_COMMON_CLKDEV) += clkdev.o
obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o
+obj-$(CONFIG_PM_RUNTIME) += pm_runtime_clock.o
diff --git a/arch/arm/common/pm_runtime_clock.c b/arch/arm/common/pm_runtime_clock.c
new file mode 100644
index 0000000..453fc95
--- /dev/null
+++ b/arch/arm/common/pm_runtime_clock.c
@@ -0,0 +1,176 @@
+/*
+ * Generic Runtime PM support code for managing device clocks
+ *
+ * Copyright (C) 2009-2010 Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/bitmap.h>
+#include <linux/err.h>
+
+#ifdef CONFIG_PM_RUNTIME
+#define BIT_ONCE 0
+#define BIT_ACTIVE 1
+#define BIT_CLK_ENABLED 2
+
+struct pm_runtime_data {
+ unsigned long flags;
+ struct clk *clk;
+};
+
+static void __devres_release(struct device *dev, void *res)
+{
+ struct pm_runtime_data *prd = res;
+
+ dev_dbg(dev, "__devres_release()\n");
+
+ if (test_bit(BIT_CLK_ENABLED, &prd->flags))
+ clk_disable(prd->clk);
+
+ if (test_bit(BIT_ACTIVE, &prd->flags))
+ clk_put(prd->clk);
+}
+
+static struct pm_runtime_data *__to_prd(struct device *dev)
+{
+ return devres_find(dev, __devres_release, NULL, NULL);
+}
+
+static void platform_pm_runtime_init(struct device *dev,
+ struct pm_runtime_data *prd)
+{
+ if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) {
+ prd->clk = clk_get(dev, NULL);
+ if (!IS_ERR(prd->clk)) {
+ set_bit(BIT_ACTIVE, &prd->flags);
+ dev_info(dev, "clocks managed by runtime pm\n");
+ }
+ }
+}
+
+static void platform_pm_runtime_bug(struct device *dev,
+ struct pm_runtime_data *prd)
+{
+ if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags))
+ dev_err(dev, "runtime pm suspend before resume\n");
+}
+
+static int platform_pm_runtime_suspend(struct device *dev)
+{
+ struct pm_runtime_data *prd = __to_prd(dev);
+
+ dev_dbg(dev, "platform_pm_runtime_suspend()\n");
+
+ platform_pm_runtime_bug(dev, prd);
+
+ if (prd && test_bit(BIT_ACTIVE, &prd->flags)) {
+ clk_disable(prd->clk);
+ clear_bit(BIT_CLK_ENABLED, &prd->flags);
+ }
+
+ return 0;
+}
+
+static int platform_pm_runtime_resume(struct device *dev)
+{
+ struct pm_runtime_data *prd = __to_prd(dev);
+
+ dev_dbg(dev, "platform_pm_runtime_resume()\n");
+
+ platform_pm_runtime_init(dev, prd);
+
+ if (prd && test_bit(BIT_ACTIVE, &prd->flags)) {
+ clk_enable(prd->clk);
+ set_bit(BIT_CLK_ENABLED, &prd->flags);
+ }
+
+ return 0;
+}
+
+static int platform_pm_runtime_idle(struct device *dev)
+{
+ /* suspend synchronously to disable clocks immediately */
+ return pm_runtime_suspend(dev);
+}
+
+static struct dev_power_domain platform_pm_power_domain = {
+ .ops = {
+ .runtime_suspend = platform_pm_runtime_suspend,
+ .runtime_resume = platform_pm_runtime_resume,
+ .runtime_idle = platform_pm_runtime_idle,
+ },
+};
+
+static int platform_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct pm_runtime_data *prd;
+
+ dev_dbg(dev, "platform_bus_notify() %ld !\n", action);
+
+ if (action == BUS_NOTIFY_BIND_DRIVER) {
+ prd = devres_alloc(__devres_release, sizeof(*prd), GFP_KERNEL);
+ if (prd) {
+ devres_add(dev, prd);
+ dev->pwr_domain = &platform_pm_power_domain;
+ } else {
+ dev_err(dev, "unable to alloc memory for runtime pm\n");
+ }
+ }
+
+ return 0;
+}
+
+#else /* CONFIG_PM_RUNTIME */
+
+static int platform_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct clk *clk;
+
+ dev_dbg(dev, "platform_bus_notify() %ld !\n", action);
+
+ switch (action) {
+ case BUS_NOTIFY_BIND_DRIVER:
+ clk = clk_get(dev, NULL);
+ if (!IS_ERR(clk)) {
+ clk_enable(clk);
+ clk_put(clk);
+ dev_info(dev, "runtime pm disabled, clock forced on\n");
+ }
+ break;
+ case BUS_NOTIFY_UNBOUND_DRIVER:
+ clk = clk_get(dev, NULL);
+ if (!IS_ERR(clk)) {
+ clk_disable(clk);
+ clk_put(clk);
+ dev_info(dev, "runtime pm disabled, clock forced off\n");
+ }
+ break;
+ }
+
+ return 0;
+}
+
+#endif /* CONFIG_PM_RUNTIME */
+
+static struct notifier_block platform_bus_notifier = {
+ .notifier_call = platform_bus_notify
+};
+
+int __init pm_runtime_clock_init(void)
+{
+ bus_register_notifier(&platform_bus_type, &platform_bus_notifier);
+ return 0;
+}
diff --git a/arch/arm/include/asm/pm_runtime.h b/arch/arm/include/asm/pm_runtime.h
new file mode 100644
index 0000000..0c54b07
--- /dev/null
+++ b/arch/arm/include/asm/pm_runtime.h
@@ -0,0 +1,17 @@
+/*
+ * ARM common runtime PM definitions/prototypes
+ *
+ * Author: Kevin Hilman
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#ifndef __ASM_PM_RUNTIME_H__
+#define __ASM_PM_RUNTIME_H__
+
+int __init pm_runtime_clock_init(void);
+
+#endif /* __ASM_PM_RUNTIME_H__ */
diff --git a/arch/arm/mach-shmobile/pm_runtime.c b/arch/arm/mach-shmobile/pm_runtime.c
deleted file mode 100644
index 6c75c3f..0000000
--- a/arch/arm/mach-shmobile/pm_runtime.c
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * arch/arm/mach-shmobile/pm_runtime.c
- *
- * Runtime PM support code for SuperH Mobile ARM
- *
- * Copyright (C) 2009-2010 Magnus Damm
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/io.h>
-#include <linux/pm_runtime.h>
-#include <linux/platform_device.h>
-#include <linux/clk.h>
-#include <linux/sh_clk.h>
-#include <linux/bitmap.h>
-
-#ifdef CONFIG_PM_RUNTIME
-#define BIT_ONCE 0
-#define BIT_ACTIVE 1
-#define BIT_CLK_ENABLED 2
-
-struct pm_runtime_data {
- unsigned long flags;
- struct clk *clk;
-};
-
-static void __devres_release(struct device *dev, void *res)
-{
- struct pm_runtime_data *prd = res;
-
- dev_dbg(dev, "__devres_release()\n");
-
- if (test_bit(BIT_CLK_ENABLED, &prd->flags))
- clk_disable(prd->clk);
-
- if (test_bit(BIT_ACTIVE, &prd->flags))
- clk_put(prd->clk);
-}
-
-static struct pm_runtime_data *__to_prd(struct device *dev)
-{
- return devres_find(dev, __devres_release, NULL, NULL);
-}
-
-static void platform_pm_runtime_init(struct device *dev,
- struct pm_runtime_data *prd)
-{
- if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags)) {
- prd->clk = clk_get(dev, NULL);
- if (!IS_ERR(prd->clk)) {
- set_bit(BIT_ACTIVE, &prd->flags);
- dev_info(dev, "clocks managed by runtime pm\n");
- }
- }
-}
-
-static void platform_pm_runtime_bug(struct device *dev,
- struct pm_runtime_data *prd)
-{
- if (prd && !test_and_set_bit(BIT_ONCE, &prd->flags))
- dev_err(dev, "runtime pm suspend before resume\n");
-}
-
-static int platform_pm_runtime_suspend(struct device *dev)
-{
- struct pm_runtime_data *prd = __to_prd(dev);
-
- dev_dbg(dev, "platform_pm_runtime_suspend()\n");
-
- platform_pm_runtime_bug(dev, prd);
-
- if (prd && test_bit(BIT_ACTIVE, &prd->flags)) {
- clk_disable(prd->clk);
- clear_bit(BIT_CLK_ENABLED, &prd->flags);
- }
-
- return 0;
-}
-
-static int platform_pm_runtime_resume(struct device *dev)
-{
- struct pm_runtime_data *prd = __to_prd(dev);
-
- dev_dbg(dev, "platform_pm_runtime_resume()\n");
-
- platform_pm_runtime_init(dev, prd);
-
- if (prd && test_bit(BIT_ACTIVE, &prd->flags)) {
- clk_enable(prd->clk);
- set_bit(BIT_CLK_ENABLED, &prd->flags);
- }
-
- return 0;
-}
-
-static int platform_pm_runtime_idle(struct device *dev)
-{
- /* suspend synchronously to disable clocks immediately */
- return pm_runtime_suspend(dev);
-}
-
-static struct dev_power_domain platform_pm_power_domain = {
- .ops = {
- .runtime_suspend = platform_pm_runtime_suspend,
- .runtime_resume = platform_pm_runtime_resume,
- .runtime_idle = platform_pm_runtime_idle,
- },
-};
-
-static int platform_bus_notify(struct notifier_block *nb,
- unsigned long action, void *data)
-{
- struct device *dev = data;
- struct pm_runtime_data *prd;
-
- dev_dbg(dev, "platform_bus_notify() %ld !\n", action);
-
- if (action == BUS_NOTIFY_BIND_DRIVER) {
- prd = devres_alloc(__devres_release, sizeof(*prd), GFP_KERNEL);
- if (prd) {
- devres_add(dev, prd);
- dev->pwr_domain = &platform_pm_power_domain;
- } else {
- dev_err(dev, "unable to alloc memory for runtime pm\n");
- }
- }
-
- return 0;
-}
-
-#else /* CONFIG_PM_RUNTIME */
-
-static int platform_bus_notify(struct notifier_block *nb,
- unsigned long action, void *data)
-{
- struct device *dev = data;
- struct clk *clk;
-
- dev_dbg(dev, "platform_bus_notify() %ld !\n", action);
-
- switch (action) {
- case BUS_NOTIFY_BIND_DRIVER:
- clk = clk_get(dev, NULL);
- if (!IS_ERR(clk)) {
- clk_enable(clk);
- clk_put(clk);
- dev_info(dev, "runtime pm disabled, clock forced on\n");
- }
- break;
- case BUS_NOTIFY_UNBOUND_DRIVER:
- clk = clk_get(dev, NULL);
- if (!IS_ERR(clk)) {
- clk_disable(clk);
- clk_put(clk);
- dev_info(dev, "runtime pm disabled, clock forced off\n");
- }
- break;
- }
-
- return 0;
-}
-
-#endif /* CONFIG_PM_RUNTIME */
-
-static struct notifier_block platform_bus_notifier = {
- .notifier_call = platform_bus_notify
-};
-
-static int __init sh_pm_runtime_init(void)
-{
- bus_register_notifier(&platform_bus_type, &platform_bus_notifier);
- return 0;
-}
-core_initcall(sh_pm_runtime_init);
--
1.7.4
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