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* [PATCH 1/3] PM: wakeup: Add routine to help fetch wakeup source object.
@ 2019-05-17  2:47 Ran Wang
  2019-05-17  2:47 ` Ran Wang
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Ran Wang @ 2019-05-17  2:47 UTC (permalink / raw)
  To: Li Yang, Rob Herring, Mark Rutland
  Cc: Len Brown, devicetree, Greg Kroah-Hartman, linux-pm,
	Rafael J . Wysocki, linux-kernel, Pavel Machek, Ran Wang,
	linuxppc-dev, linux-arm-kernel

Some user might want to go through all registered wakeup sources
and doing things accordingly. For example, SoC PM driver might need to
do HW programming to prevent powering down specific IP which wakeup
source depending on. And is user's responsibility to identify if this
wakeup source he is interested in.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
---
 drivers/base/power/wakeup.c |   18 ++++++++++++++++++
 include/linux/pm_wakeup.h   |    3 +++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 5fa1898..8d75795 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -14,6 +14,7 @@
 #include <linux/suspend.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <linux/of_device.h>
 #include <linux/pm_wakeirq.h>
 #include <trace/events/power.h>
 
@@ -236,6 +237,22 @@ void wakeup_source_unregister(struct wakeup_source *ws)
 	}
 }
 EXPORT_SYMBOL_GPL(wakeup_source_unregister);
+/**
+ * wakeup_source_get_next - Get next wakeup source from the list
+ * @ws: Previous wakeup source object, null means caller want first one.
+ */
+struct wakeup_source *wakeup_source_get_next(struct wakeup_source *ws)
+{
+	struct list_head *ws_head = &wakeup_sources;
+
+	if (ws)
+		return list_next_or_null_rcu(ws_head, &ws->entry,
+				struct wakeup_source, entry);
+	else
+		return list_entry_rcu(ws_head->next,
+				struct wakeup_source, entry);
+}
+EXPORT_SYMBOL_GPL(wakeup_source_get_next);
 
 /**
  * device_wakeup_attach - Attach a wakeup source object to a device object.
@@ -252,6 +269,7 @@ static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
 		return -EEXIST;
 	}
 	dev->power.wakeup = ws;
+	ws->attached_dev = dev;
 	if (dev->power.wakeirq)
 		device_wakeup_attach_irq(dev, dev->power.wakeirq);
 	spin_unlock_irq(&dev->power.lock);
diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h
index 4238dde..1335487 100644
--- a/include/linux/pm_wakeup.h
+++ b/include/linux/pm_wakeup.h
@@ -50,6 +50,7 @@
  * @wakeup_count: Number of times the wakeup source might abort suspend.
  * @active: Status of the wakeup source.
  * @has_timeout: The wakeup source has been activated with a timeout.
+ * @attached_dev: The device it attached to
  */
 struct wakeup_source {
 	const char 		*name;
@@ -70,6 +71,7 @@ struct wakeup_source {
 	unsigned long		wakeup_count;
 	bool			active:1;
 	bool			autosleep_enabled:1;
+	struct device	*attached_dev;
 };
 
 #ifdef CONFIG_PM_SLEEP
@@ -102,6 +104,7 @@ static inline void device_set_wakeup_path(struct device *dev)
 extern void wakeup_source_remove(struct wakeup_source *ws);
 extern struct wakeup_source *wakeup_source_register(const char *name);
 extern void wakeup_source_unregister(struct wakeup_source *ws);
+extern struct wakeup_source *wakeup_source_get_next(struct wakeup_source *ws);
 extern int device_wakeup_enable(struct device *dev);
 extern int device_wakeup_disable(struct device *dev);
 extern void device_set_wakeup_capable(struct device *dev, bool capable);
-- 
1.7.1

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH 1/3] PM: wakeup: Add routine to help fetch wakeup source object.
  2019-05-17  2:47 [PATCH 1/3] PM: wakeup: Add routine to help fetch wakeup source object Ran Wang
@ 2019-05-17  2:47 ` Ran Wang
  2019-05-17  2:47 ` [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define Ran Wang
  2019-05-17  2:47 ` [PATCH 3/3] soc: fsl: add RCPM driver Ran Wang
  2 siblings, 0 replies; 7+ messages in thread
From: Ran Wang @ 2019-05-17  2:47 UTC (permalink / raw)
  To: Li Yang, Rob Herring, Mark Rutland
  Cc: Rafael J . Wysocki, Pavel Machek, Len Brown, Greg Kroah-Hartman,
	linuxppc-dev, linux-arm-kernel, devicetree, linux-kernel,
	linux-pm, Ran Wang

Some user might want to go through all registered wakeup sources
and doing things accordingly. For example, SoC PM driver might need to
do HW programming to prevent powering down specific IP which wakeup
source depending on. And is user's responsibility to identify if this
wakeup source he is interested in.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
---
 drivers/base/power/wakeup.c |   18 ++++++++++++++++++
 include/linux/pm_wakeup.h   |    3 +++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 5fa1898..8d75795 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -14,6 +14,7 @@
 #include <linux/suspend.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
+#include <linux/of_device.h>
 #include <linux/pm_wakeirq.h>
 #include <trace/events/power.h>
 
@@ -236,6 +237,22 @@ void wakeup_source_unregister(struct wakeup_source *ws)
 	}
 }
 EXPORT_SYMBOL_GPL(wakeup_source_unregister);
+/**
+ * wakeup_source_get_next - Get next wakeup source from the list
+ * @ws: Previous wakeup source object, null means caller want first one.
+ */
+struct wakeup_source *wakeup_source_get_next(struct wakeup_source *ws)
+{
+	struct list_head *ws_head = &wakeup_sources;
+
+	if (ws)
+		return list_next_or_null_rcu(ws_head, &ws->entry,
+				struct wakeup_source, entry);
+	else
+		return list_entry_rcu(ws_head->next,
+				struct wakeup_source, entry);
+}
+EXPORT_SYMBOL_GPL(wakeup_source_get_next);
 
 /**
  * device_wakeup_attach - Attach a wakeup source object to a device object.
@@ -252,6 +269,7 @@ static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
 		return -EEXIST;
 	}
 	dev->power.wakeup = ws;
+	ws->attached_dev = dev;
 	if (dev->power.wakeirq)
 		device_wakeup_attach_irq(dev, dev->power.wakeirq);
 	spin_unlock_irq(&dev->power.lock);
diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h
index 4238dde..1335487 100644
--- a/include/linux/pm_wakeup.h
+++ b/include/linux/pm_wakeup.h
@@ -50,6 +50,7 @@
  * @wakeup_count: Number of times the wakeup source might abort suspend.
  * @active: Status of the wakeup source.
  * @has_timeout: The wakeup source has been activated with a timeout.
+ * @attached_dev: The device it attached to
  */
 struct wakeup_source {
 	const char 		*name;
@@ -70,6 +71,7 @@ struct wakeup_source {
 	unsigned long		wakeup_count;
 	bool			active:1;
 	bool			autosleep_enabled:1;
+	struct device	*attached_dev;
 };
 
 #ifdef CONFIG_PM_SLEEP
@@ -102,6 +104,7 @@ static inline void device_set_wakeup_path(struct device *dev)
 extern void wakeup_source_remove(struct wakeup_source *ws);
 extern struct wakeup_source *wakeup_source_register(const char *name);
 extern void wakeup_source_unregister(struct wakeup_source *ws);
+extern struct wakeup_source *wakeup_source_get_next(struct wakeup_source *ws);
 extern int device_wakeup_enable(struct device *dev);
 extern int device_wakeup_disable(struct device *dev);
 extern void device_set_wakeup_capable(struct device *dev, bool capable);
-- 
1.7.1


^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define
  2019-05-17  2:47 [PATCH 1/3] PM: wakeup: Add routine to help fetch wakeup source object Ran Wang
  2019-05-17  2:47 ` Ran Wang
@ 2019-05-17  2:47 ` Ran Wang
  2019-05-17  2:47   ` Ran Wang
  2019-06-13 22:07   ` Rob Herring
  2019-05-17  2:47 ` [PATCH 3/3] soc: fsl: add RCPM driver Ran Wang
  2 siblings, 2 replies; 7+ messages in thread
From: Ran Wang @ 2019-05-17  2:47 UTC (permalink / raw)
  To: Li Yang, Rob Herring, Mark Rutland
  Cc: Rafael J . Wysocki, Pavel Machek, Len Brown, Greg Kroah-Hartman,
	linuxppc-dev, linux-arm-kernel, devicetree, linux-kernel,
	linux-pm, Ran Wang

By default, QorIQ SoC's RCPM register block is Big Endian. But
there are some exceptions, such as LS1088A and LS2088A, are Little
Endian. So add this optional property to help identify them.

Actually LS2021A and other Layerscapes won't totally follow Chassis
2.1, so separate them from powerpc SoC.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
---
 Documentation/devicetree/bindings/soc/fsl/rcpm.txt |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
index e284e4e..058154c 100644
--- a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+++ b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
@@ -20,6 +20,7 @@ Required properites:
 	* "fsl,qoriq-rcpm-1.0": for chassis 1.0 rcpm
 	* "fsl,qoriq-rcpm-2.0": for chassis 2.0 rcpm
 	* "fsl,qoriq-rcpm-2.1": for chassis 2.1 rcpm
+	* "fsl,qoriq-rcpm-2.1+": for chassis 2.1+ rcpm
 
 All references to "1.0" and "2.0" refer to the QorIQ chassis version to
 which the chip complies.
@@ -27,7 +28,12 @@ Chassis Version		Example Chips
 ---------------		-------------------------------
 1.0				p4080, p5020, p5040, p2041, p3041
 2.0				t4240, b4860, b4420
-2.1				t1040, ls1021
+2.1				t1040,
+2.1+			ls1021a, ls1012a, ls1043a, ls1046a
+
+Optional properties:
+ - little-endian : RCPM register block is Little Endian. Without it RCPM
+   will be Big Endian (default case).
 
 Example:
 The RCPM node for T4240:
-- 
1.7.1

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define
  2019-05-17  2:47 ` [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define Ran Wang
@ 2019-05-17  2:47   ` Ran Wang
  2019-06-13 22:07   ` Rob Herring
  1 sibling, 0 replies; 7+ messages in thread
From: Ran Wang @ 2019-05-17  2:47 UTC (permalink / raw)
  To: Li Yang, Rob Herring, Mark Rutland
  Cc: Rafael J . Wysocki, Pavel Machek, Len Brown, Greg Kroah-Hartman,
	linuxppc-dev, linux-arm-kernel, devicetree, linux-kernel,
	linux-pm, Ran Wang

By default, QorIQ SoC's RCPM register block is Big Endian. But
there are some exceptions, such as LS1088A and LS2088A, are Little
Endian. So add this optional property to help identify them.

Actually LS2021A and other Layerscapes won't totally follow Chassis
2.1, so separate them from powerpc SoC.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
---
 Documentation/devicetree/bindings/soc/fsl/rcpm.txt |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
index e284e4e..058154c 100644
--- a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+++ b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
@@ -20,6 +20,7 @@ Required properites:
 	* "fsl,qoriq-rcpm-1.0": for chassis 1.0 rcpm
 	* "fsl,qoriq-rcpm-2.0": for chassis 2.0 rcpm
 	* "fsl,qoriq-rcpm-2.1": for chassis 2.1 rcpm
+	* "fsl,qoriq-rcpm-2.1+": for chassis 2.1+ rcpm
 
 All references to "1.0" and "2.0" refer to the QorIQ chassis version to
 which the chip complies.
@@ -27,7 +28,12 @@ Chassis Version		Example Chips
 ---------------		-------------------------------
 1.0				p4080, p5020, p5040, p2041, p3041
 2.0				t4240, b4860, b4420
-2.1				t1040, ls1021
+2.1				t1040,
+2.1+			ls1021a, ls1012a, ls1043a, ls1046a
+
+Optional properties:
+ - little-endian : RCPM register block is Little Endian. Without it RCPM
+   will be Big Endian (default case).
 
 Example:
 The RCPM node for T4240:
-- 
1.7.1


^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH 3/3] soc: fsl: add RCPM driver
  2019-05-17  2:47 [PATCH 1/3] PM: wakeup: Add routine to help fetch wakeup source object Ran Wang
  2019-05-17  2:47 ` Ran Wang
  2019-05-17  2:47 ` [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define Ran Wang
@ 2019-05-17  2:47 ` Ran Wang
  2019-05-17  2:47   ` Ran Wang
  2 siblings, 1 reply; 7+ messages in thread
From: Ran Wang @ 2019-05-17  2:47 UTC (permalink / raw)
  To: Li Yang, Rob Herring, Mark Rutland
  Cc: Rafael J . Wysocki, Pavel Machek, Len Brown, Greg Kroah-Hartman,
	linuxppc-dev, linux-arm-kernel, devicetree, linux-kernel,
	linux-pm, Ran Wang

The NXP's QorIQ Processors based on ARM Core have RCPM module
(Run Control and Power Management), which performs all device-level
tasks associated with power management such as wakeup source control.

This driver depends on PM wakeup source framework which help to
collect wake information.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
---
 drivers/soc/fsl/Kconfig  |    8 +++
 drivers/soc/fsl/Makefile |    1 +
 drivers/soc/fsl/rcpm.c   |  124 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 133 insertions(+), 0 deletions(-)
 create mode 100644 drivers/soc/fsl/rcpm.c

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
index 3b85e18..a25e05b 100644
--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig
@@ -50,4 +50,12 @@ config FSL_SLEEP_FSM
 if ARM || ARM64
 source "drivers/soc/fsl/Kconfig.arm"
 endif
+
+config FSL_RCPM
+	bool "Freescale RCPM support"
+	depends on PM_SLEEP
+	help
+	  The NXP's QorIQ Processors based on ARM Core have RCPM module
+	  (Run Control and Power Management), which performs all device-level
+	  tasks associated with power management, such as wakeup source control.
 endmenu
diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index db7b09b..aab9f9b 100644
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_FSL_MC_DPIO) 		+= dpio/
 obj-$(CONFIG_FSL_LS2_CONSOLE)		+= ls2-console/
 obj-$(CONFIG_LS_SOC_DRIVERS)		+= layerscape/
 obj-$(CONFIG_FSL_SLEEP_FSM)	+= sleep_fsm.o
+obj-$(CONFIG_FSL_RCPM)		+= rcpm.o
diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c
new file mode 100644
index 0000000..b817319
--- /dev/null
+++ b/drivers/soc/fsl/rcpm.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// rcpm.c - Freescale QorIQ RCPM driver
+//
+// Copyright 2019 NXP
+//
+// Author: Ran Wang <ran.wang_1@nxp.com>,
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/kernel.h>
+
+#define RCPM_WAKEUP_CELL_MAX_SIZE	7
+
+struct rcpm {
+	unsigned int wakeup_cells;
+	void __iomem *ippdexpcr_base;
+	bool	little_endian;
+};
+
+static int rcpm_pm_prepare(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct wakeup_source *ws;
+	struct rcpm *rcpm;
+	u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1], tmp;
+	int i, ret;
+
+	rcpm = dev_get_drvdata(dev);
+	if (!rcpm)
+		return -EINVAL;
+
+	/* Begin with first registered wakeup source */
+	ws = wakeup_source_get_next(NULL);
+	while (ws) {
+		ret = device_property_read_u32_array(ws->attached_dev,
+				"fsl,rcpm-wakeup", value, rcpm->wakeup_cells + 1);
+
+		/*  Wakeup source should refer to current rcpm device */
+		if (ret || (np->phandle != value[0])) {
+			dev_info(dev, "%s doesn't refer to this rcpm\n",
+					ws->name);
+			ws = wakeup_source_get_next(ws);
+			continue;
+		}
+
+		for (i = 0; i < rcpm->wakeup_cells; i++) {
+			/* We can only OR related bits */
+			if (value[i + 1]) {
+				if (rcpm->little_endian) {
+					tmp = ioread32(rcpm->ippdexpcr_base + i * 4);
+					tmp |= value[i + 1];
+					iowrite32(tmp, rcpm->ippdexpcr_base + i * 4);
+				} else {
+					tmp = ioread32be(rcpm->ippdexpcr_base + i * 4);
+					tmp |= value[i + 1];
+					iowrite32be(tmp, rcpm->ippdexpcr_base + i * 4);
+				}
+			}
+		}
+		ws = wakeup_source_get_next(ws);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops rcpm_pm_ops = {
+	.prepare =  rcpm_pm_prepare,
+};
+
+static int rcpm_probe(struct platform_device *pdev)
+{
+	struct device	*dev = &pdev->dev;
+	struct resource *r;
+	struct rcpm		*rcpm;
+	int ret;
+
+	rcpm = devm_kzalloc(dev, sizeof(*rcpm), GFP_KERNEL);
+	if (!rcpm)
+		return -ENOMEM;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -ENODEV;
+
+	rcpm->ippdexpcr_base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(rcpm->ippdexpcr_base)) {
+		ret =  PTR_ERR(rcpm->ippdexpcr_base);
+		return ret;
+	}
+
+	rcpm->little_endian = device_property_read_bool(
+			&pdev->dev, "little-endian");
+
+	ret = device_property_read_u32(&pdev->dev,
+			"fsl,#rcpm-wakeup-cells", &rcpm->wakeup_cells);
+	if (ret)
+		return ret;
+
+	dev_set_drvdata(&pdev->dev, rcpm);
+
+	return 0;
+}
+
+static const struct of_device_id rcpm_of_match[] = {
+	{ .compatible = "fsl,qoriq-rcpm-2.1+", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rcpm_of_match);
+
+static struct platform_driver rcpm_driver = {
+	.driver = {
+		.name = "rcpm",
+		.of_match_table = rcpm_of_match,
+		.pm	= &rcpm_pm_ops,
+	},
+	.probe = rcpm_probe,
+};
+
+module_platform_driver(rcpm_driver);
-- 
1.7.1

^ permalink raw reply	[flat|nested] 7+ messages in thread

* [PATCH 3/3] soc: fsl: add RCPM driver
  2019-05-17  2:47 ` [PATCH 3/3] soc: fsl: add RCPM driver Ran Wang
@ 2019-05-17  2:47   ` Ran Wang
  0 siblings, 0 replies; 7+ messages in thread
From: Ran Wang @ 2019-05-17  2:47 UTC (permalink / raw)
  To: Li Yang, Rob Herring, Mark Rutland
  Cc: Rafael J . Wysocki, Pavel Machek, Len Brown, Greg Kroah-Hartman,
	linuxppc-dev, linux-arm-kernel, devicetree, linux-kernel,
	linux-pm, Ran Wang

The NXP's QorIQ Processors based on ARM Core have RCPM module
(Run Control and Power Management), which performs all device-level
tasks associated with power management such as wakeup source control.

This driver depends on PM wakeup source framework which help to
collect wake information.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
---
 drivers/soc/fsl/Kconfig  |    8 +++
 drivers/soc/fsl/Makefile |    1 +
 drivers/soc/fsl/rcpm.c   |  124 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 133 insertions(+), 0 deletions(-)
 create mode 100644 drivers/soc/fsl/rcpm.c

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
index 3b85e18..a25e05b 100644
--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig
@@ -50,4 +50,12 @@ config FSL_SLEEP_FSM
 if ARM || ARM64
 source "drivers/soc/fsl/Kconfig.arm"
 endif
+
+config FSL_RCPM
+	bool "Freescale RCPM support"
+	depends on PM_SLEEP
+	help
+	  The NXP's QorIQ Processors based on ARM Core have RCPM module
+	  (Run Control and Power Management), which performs all device-level
+	  tasks associated with power management, such as wakeup source control.
 endmenu
diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index db7b09b..aab9f9b 100644
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_FSL_MC_DPIO) 		+= dpio/
 obj-$(CONFIG_FSL_LS2_CONSOLE)		+= ls2-console/
 obj-$(CONFIG_LS_SOC_DRIVERS)		+= layerscape/
 obj-$(CONFIG_FSL_SLEEP_FSM)	+= sleep_fsm.o
+obj-$(CONFIG_FSL_RCPM)		+= rcpm.o
diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c
new file mode 100644
index 0000000..b817319
--- /dev/null
+++ b/drivers/soc/fsl/rcpm.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// rcpm.c - Freescale QorIQ RCPM driver
+//
+// Copyright 2019 NXP
+//
+// Author: Ran Wang <ran.wang_1@nxp.com>,
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/kernel.h>
+
+#define RCPM_WAKEUP_CELL_MAX_SIZE	7
+
+struct rcpm {
+	unsigned int wakeup_cells;
+	void __iomem *ippdexpcr_base;
+	bool	little_endian;
+};
+
+static int rcpm_pm_prepare(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct wakeup_source *ws;
+	struct rcpm *rcpm;
+	u32 value[RCPM_WAKEUP_CELL_MAX_SIZE + 1], tmp;
+	int i, ret;
+
+	rcpm = dev_get_drvdata(dev);
+	if (!rcpm)
+		return -EINVAL;
+
+	/* Begin with first registered wakeup source */
+	ws = wakeup_source_get_next(NULL);
+	while (ws) {
+		ret = device_property_read_u32_array(ws->attached_dev,
+				"fsl,rcpm-wakeup", value, rcpm->wakeup_cells + 1);
+
+		/*  Wakeup source should refer to current rcpm device */
+		if (ret || (np->phandle != value[0])) {
+			dev_info(dev, "%s doesn't refer to this rcpm\n",
+					ws->name);
+			ws = wakeup_source_get_next(ws);
+			continue;
+		}
+
+		for (i = 0; i < rcpm->wakeup_cells; i++) {
+			/* We can only OR related bits */
+			if (value[i + 1]) {
+				if (rcpm->little_endian) {
+					tmp = ioread32(rcpm->ippdexpcr_base + i * 4);
+					tmp |= value[i + 1];
+					iowrite32(tmp, rcpm->ippdexpcr_base + i * 4);
+				} else {
+					tmp = ioread32be(rcpm->ippdexpcr_base + i * 4);
+					tmp |= value[i + 1];
+					iowrite32be(tmp, rcpm->ippdexpcr_base + i * 4);
+				}
+			}
+		}
+		ws = wakeup_source_get_next(ws);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops rcpm_pm_ops = {
+	.prepare =  rcpm_pm_prepare,
+};
+
+static int rcpm_probe(struct platform_device *pdev)
+{
+	struct device	*dev = &pdev->dev;
+	struct resource *r;
+	struct rcpm		*rcpm;
+	int ret;
+
+	rcpm = devm_kzalloc(dev, sizeof(*rcpm), GFP_KERNEL);
+	if (!rcpm)
+		return -ENOMEM;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -ENODEV;
+
+	rcpm->ippdexpcr_base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(rcpm->ippdexpcr_base)) {
+		ret =  PTR_ERR(rcpm->ippdexpcr_base);
+		return ret;
+	}
+
+	rcpm->little_endian = device_property_read_bool(
+			&pdev->dev, "little-endian");
+
+	ret = device_property_read_u32(&pdev->dev,
+			"fsl,#rcpm-wakeup-cells", &rcpm->wakeup_cells);
+	if (ret)
+		return ret;
+
+	dev_set_drvdata(&pdev->dev, rcpm);
+
+	return 0;
+}
+
+static const struct of_device_id rcpm_of_match[] = {
+	{ .compatible = "fsl,qoriq-rcpm-2.1+", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rcpm_of_match);
+
+static struct platform_driver rcpm_driver = {
+	.driver = {
+		.name = "rcpm",
+		.of_match_table = rcpm_of_match,
+		.pm	= &rcpm_pm_ops,
+	},
+	.probe = rcpm_probe,
+};
+
+module_platform_driver(rcpm_driver);
-- 
1.7.1


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define
  2019-05-17  2:47 ` [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define Ran Wang
  2019-05-17  2:47   ` Ran Wang
@ 2019-06-13 22:07   ` Rob Herring
  1 sibling, 0 replies; 7+ messages in thread
From: Rob Herring @ 2019-06-13 22:07 UTC (permalink / raw)
  To: Ran Wang
  Cc: Li Yang, Mark Rutland, Rafael J . Wysocki, Pavel Machek,
	Len Brown, Greg Kroah-Hartman, linuxppc-dev, linux-arm-kernel,
	devicetree, linux-kernel, linux-pm, Ran Wang

On Fri, 17 May 2019 10:47:47 +0800, Ran Wang wrote:
> By default, QorIQ SoC's RCPM register block is Big Endian. But
> there are some exceptions, such as LS1088A and LS2088A, are Little
> Endian. So add this optional property to help identify them.
> 
> Actually LS2021A and other Layerscapes won't totally follow Chassis
> 2.1, so separate them from powerpc SoC.
> 
> Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
> ---
>  Documentation/devicetree/bindings/soc/fsl/rcpm.txt |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, back to index

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-17  2:47 [PATCH 1/3] PM: wakeup: Add routine to help fetch wakeup source object Ran Wang
2019-05-17  2:47 ` Ran Wang
2019-05-17  2:47 ` [PATCH 2/3] Documentation: dt: binding: fsl: Add 'little-endian' and update Chassis define Ran Wang
2019-05-17  2:47   ` Ran Wang
2019-06-13 22:07   ` Rob Herring
2019-05-17  2:47 ` [PATCH 3/3] soc: fsl: add RCPM driver Ran Wang
2019-05-17  2:47   ` Ran Wang

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