[PATCH v4 1/2] bluetooth: btmrvl: register platform specific driver

[PATCH v4 1/2] bluetooth: btmrvl: register platform specific driver

[Amitkumar Karwar]

From: Xinming Hu <huxm@marvell.com>

Platform device and driver provide easy way to
interact with device-tree-enabled system.

This patch registers platform driver and reorganise
existing device tree specific code.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
---
v3: Add NULL check for 'btmrvl_plt_dev'
v4: Moved the bindings file to bindings/net/
    Corrected the name of 'name' and 'compatible' properties(Rob Herring)
---
 Documentation/devicetree/bindings/btmrvl.txt       | 29 -----------
 .../devicetree/bindings/net/marvell-bt-sd8xxx.txt  | 29 +++++++++++
 drivers/bluetooth/Makefile                         |  1 +
 drivers/bluetooth/btmrvl_drv.h                     | 16 ++++++
 drivers/bluetooth/btmrvl_main.c                    |  8 ++-
 drivers/bluetooth/btmrvl_platform.c                | 60 ++++++++++++++++++++++
 6 files changed, 113 insertions(+), 30 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/btmrvl.txt
 create mode 100644 Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
 create mode 100644 drivers/bluetooth/btmrvl_platform.c

diff --git a/Documentation/devicetree/bindings/btmrvl.txt b/Documentation/devicetree/bindings/btmrvl.txt
deleted file mode 100644
index 58f964b..0000000
--- a/Documentation/devicetree/bindings/btmrvl.txt
+++ /dev/null
@@ -1,29 +0,0 @@
-btmrvl
-------
-
-Required properties:
-
-  - compatible : must be "btmrvl,cfgdata"
-
-Optional properties:
-
-  - btmrvl,cal-data : Calibration data downloaded to the device during
-		      initialization. This is an array of 28 values(u8).
-
-  - btmrvl,gpio-gap : gpio and gap (in msecs) combination to be
-		      configured.
-
-Example:
-
-GPIO pin 13 is configured as a wakeup source and GAP is set to 100 msecs
-in below example.
-
-btmrvl {
-	compatible = "btmrvl,cfgdata";
-
-	btmrvl,cal-data = /bits/ 8 <
-		0x37 0x01 0x1c 0x00 0xff 0xff 0xff 0xff 0x01 0x7f 0x04 0x02
-		0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
-		0x00 0x00 0xf0 0x00>;
-	btmrvl,gpio-gap = <0x0d64>;
-};
diff --git a/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
new file mode 100644
index 0000000..516b636
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
@@ -0,0 +1,29 @@
+Marvell bluetooth sdio driver
+------
+
+Required properties:
+
+  - compatible : must be "marvell,bt-sd8xxx"
+
+Optional properties:
+
+  - btmrvl,cal-data : Calibration data downloaded to the device during
+		      initialization. This is an array of 28 values(u8).
+
+  - btmrvl,gpio-gap : gpio and gap (in msecs) combination to be
+		      configured.
+
+Example:
+
+GPIO pin 13 and gap 100ms are configured for host wakeup, calibration
+data is also available in below example.
+
+bluetooth {
+	compatible = "marvell,bt-sd8xxx";
+
+	btmrvl,cal-data = /bits/ 8 <
+		0x37 0x01 0x1c 0x00 0xff 0xff 0xff 0xff 0x01 0x7f 0x04 0x02
+		0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
+		0x00 0x00 0xf0 0x00>;
+	btmrvl,gpio-gap = <0x0d64>;
+};
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index f7cb408..d59b00b 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_BT_RTL)		+= btrtl.o
 obj-$(CONFIG_BT_QCA)		+= btqca.o
 
 btmrvl-y			:= btmrvl_main.o
+btmrvl-y			+= btmrvl_platform.o
 btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o
 
 hci_uart-y				:= hci_ldisc.o
diff --git a/drivers/bluetooth/btmrvl_drv.h b/drivers/bluetooth/btmrvl_drv.h
index 0590473..de6309b 100644
--- a/drivers/bluetooth/btmrvl_drv.h
+++ b/drivers/bluetooth/btmrvl_drv.h
@@ -22,8 +22,22 @@
 #include <linux/kthread.h>
 #include <linux/bitops.h>
 #include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/gfp.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <net/bluetooth/bluetooth.h>
 
+extern struct platform_device *btmrvl_plt_dev;
+
 #define BTM_HEADER_LEN			4
 #define BTM_UPLD_SIZE			2312
 
@@ -174,6 +188,8 @@ int btmrvl_enable_ps(struct btmrvl_private *priv);
 int btmrvl_prepare_command(struct btmrvl_private *priv);
 int btmrvl_enable_hs(struct btmrvl_private *priv);
 void btmrvl_firmware_dump(struct btmrvl_private *priv);
+int btmrvl_platform_drv_init(void);
+void btmrvl_platform_drv_exit(void);
 
 #ifdef CONFIG_DEBUG_FS
 void btmrvl_debugfs_init(struct hci_dev *hdev);
diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index f25a825..34a0b61 100644
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -514,7 +514,9 @@ static int btmrvl_check_device_tree(struct btmrvl_private *priv)
 	int ret;
 	u32 val;
 
-	for_each_compatible_node(dt_node, NULL, "btmrvl,cfgdata") {
+	dt_node = btmrvl_plt_dev ?
+			btmrvl_plt_dev->dev.of_node : NULL;
+	if (dt_node) {
 		ret = of_property_read_u32(dt_node, "btmrvl,gpio-gap", &val);
 		if (!ret)
 			priv->btmrvl_dev.gpio_gap = val;
@@ -733,6 +735,8 @@ struct btmrvl_private *btmrvl_add_card(void *card)
 		goto err_adapter;
 	}
 
+	btmrvl_platform_drv_init();
+
 	btmrvl_init_adapter(priv);
 
 	BT_DBG("Starting kthread...");
@@ -776,6 +780,8 @@ int btmrvl_remove_card(struct btmrvl_private *priv)
 	btmrvl_debugfs_remove(hdev);
 #endif
 
+	btmrvl_platform_drv_exit();
+
 	hci_unregister_dev(hdev);
 
 	hci_free_dev(hdev);
diff --git a/drivers/bluetooth/btmrvl_platform.c b/drivers/bluetooth/btmrvl_platform.c
new file mode 100644
index 0000000..d2305dd
--- /dev/null
+++ b/drivers/bluetooth/btmrvl_platform.c
@@ -0,0 +1,60 @@
+/* Marvell Bluetooth driver: platform specific driver
+ *
+ * Copyright (C) 2015, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available on the worldwide web at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#include "btmrvl_drv.h"
+
+struct platform_device *btmrvl_plt_dev;
+
+static int btmrvl_plt_probe(struct platform_device *pdev)
+{
+	btmrvl_plt_dev = pdev;
+	return 0;
+}
+
+static int btmrvl_plt_remove(struct platform_device *pdev)
+{
+	btmrvl_plt_dev = NULL;
+	return 0;
+}
+
+static const struct of_device_id btmrvl_dt_match[] = {
+	{
+		.compatible = "marvell,bt-sd8xxx",
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, btmrvl_dt_match);
+
+static struct platform_driver btmrvl_platform_driver = {
+	.probe		= btmrvl_plt_probe,
+	.remove		= btmrvl_plt_remove,
+	.driver = {
+		.name	= "btmrvl_plt",
+		.of_match_table = btmrvl_dt_match,
+	}
+};
+
+int btmrvl_platform_drv_init(void)
+{
+	return platform_driver_register(&btmrvl_platform_driver);
+}
+
+void btmrvl_platform_drv_exit(void)
+{
+	platform_driver_unregister(&btmrvl_platform_driver);
+}
-- 
1.8.1.4

[PATCH v4 2/2] bluetooth: btmrvl: parse host wakeup configuration from device tree

[Amitkumar Karwar]

From: Xinming Hu <huxm@marvell.com>

This patch implements a framework for board specific wakeup.
driver parse irq/gpio number from device tree, corresponding
resources will be allocated, and used for host suspend/resume.
Device tree binding file is also updated in the patch.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
---
v2: Fixed build error reported by kbuild test robot
drivers/bluetooth/btmrvl_platform.c:141:22: error:
'btmrvl_plt_pm_ops' undeclared here (not in a function)
---
 .../devicetree/bindings/net/marvell-bt-sd8xxx.txt  | 17 +++-
 drivers/bluetooth/btmrvl_platform.c                | 91 ++++++++++++++++++++++
 2 files changed, 106 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
index 516b636..fdc87c4 100644
--- a/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
+++ b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
@@ -12,11 +12,19 @@ Optional properties:
 
   - btmrvl,gpio-gap : gpio and gap (in msecs) combination to be
 		      configured.
+  - interrupt-parent: phandle of the parent interrupt controller
+  - interrupts : interrupt number to the cpu
+  - gpios: specify GPIO respectively. gpio here is board specific pin.
+	   while above gpio-gap represents the device side pin used to
+	   wakeup host.
+  - pinctrl-names : a pinctrl state named "default" must be defined
+  - pinctrl-0 : pin control group to be used for this controller
 
 Example:
 
-GPIO pin 13 and gap 100ms are configured for host wakeup, calibration
-data is also available in below example.
+GPIO pin 119 and gap 100ms are configured for host wakeup,
+pin 13 is configured so that firmware can wakeup host using this device side
+pin, calibration data is also available in below example.
 
 bluetooth {
 	compatible = "marvell,bt-sd8xxx";
@@ -26,4 +34,9 @@ bluetooth {
 		0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
 		0x00 0x00 0xf0 0x00>;
 	btmrvl,gpio-gap = <0x0d64>;
+	interrupt-parent = <&pio>;
+	interrupts = <119 IRQ_TYPE_LEVEL_LOW>;
+	gpios = <&pio 119 GPIO_ACTIVE_HIGH>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&wake_pins>;
 };
diff --git a/drivers/bluetooth/btmrvl_platform.c b/drivers/bluetooth/btmrvl_platform.c
index d2305dd..c9a353c 100644
--- a/drivers/bluetooth/btmrvl_platform.c
+++ b/drivers/bluetooth/btmrvl_platform.c
@@ -19,9 +19,63 @@
 
 struct platform_device *btmrvl_plt_dev;
 
+struct btmrvl_wake_dev {
+	struct device	*dev;
+	int		irq_bt;
+	bool		wake_by_bt;
+};
+
+static irqreturn_t btmrvl_wake_irq_bt(int irq, void *priv)
+{
+	struct btmrvl_wake_dev *ctx = priv;
+
+	if (ctx->irq_bt >= 0) {
+		ctx->wake_by_bt = true;
+		disable_irq_nosync(ctx->irq_bt);
+	}
+
+	return IRQ_HANDLED;
+}
+
 static int btmrvl_plt_probe(struct platform_device *pdev)
 {
+	int ret;
+	struct btmrvl_wake_dev *ctx;
+	int gpio;
+
 	btmrvl_plt_dev = pdev;
+
+	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->dev = &pdev->dev;
+	ctx->irq_bt = platform_get_irq(pdev, 0);
+	if (ctx->irq_bt < 0)
+		dev_err(&pdev->dev, "Failed to get irq_bt\n");
+
+	gpio = of_get_gpio(pdev->dev.of_node, 0);
+	if (gpio_is_valid(gpio))
+		gpio_direction_input(gpio);
+	else
+		dev_err(&pdev->dev, "gpio bt is invalid\n");
+
+	if (ctx->irq_bt >= 0) {
+		ret = devm_request_irq(&pdev->dev, ctx->irq_bt,
+				       btmrvl_wake_irq_bt,
+				       IRQF_TRIGGER_LOW,
+				       "bt_wake", ctx);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Failed to request irq_bt %d (%d)\n",
+				ctx->irq_bt, ret);
+			return -EINVAL;
+		}
+		disable_irq(ctx->irq_bt);
+	}
+
+	platform_set_drvdata(pdev, ctx);
+
 	return 0;
 }
 
@@ -31,6 +85,42 @@ static int btmrvl_plt_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused btmrvl_plt_suspend(struct device *dev)
+{
+	struct btmrvl_wake_dev *ctx = dev_get_drvdata(dev);
+	int ret;
+
+	if (ctx->irq_bt >= 0) {
+		ctx->wake_by_bt = false;
+		enable_irq(ctx->irq_bt);
+		ret = enable_irq_wake(ctx->irq_bt);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused btmrvl_plt_resume(struct device *dev)
+{
+	struct btmrvl_wake_dev *ctx = dev_get_drvdata(dev);
+	int ret;
+
+	if (ctx->irq_bt >= 0) {
+		ret = disable_irq_wake(ctx->irq_bt);
+		if (!ctx->wake_by_bt)
+			disable_irq(ctx->irq_bt);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops btmrvl_plt_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(btmrvl_plt_suspend, btmrvl_plt_resume)
+};
+
 static const struct of_device_id btmrvl_dt_match[] = {
 	{
 		.compatible = "marvell,bt-sd8xxx",
@@ -46,6 +136,7 @@ static struct platform_driver btmrvl_platform_driver = {
 	.driver = {
 		.name	= "btmrvl_plt",
 		.of_match_table = btmrvl_dt_match,
+		.pm             = &btmrvl_plt_pm_ops,
 	}
 };
 
-- 
1.8.1.4

Re: [PATCH v4 1/2] bluetooth: btmrvl: register platform specific driver

[Rob Herring]

On Tue, Feb 16, 2016 at 01:55:54AM -0800, Amitkumar Karwar wrote:
> From: Xinming Hu <huxm@marvell.com>
> 
> Platform device and driver provide easy way to
> interact with device-tree-enabled system.
> 
> This patch registers platform driver and reorganise
> existing device tree specific code.
> 
> Signed-off-by: Xinming Hu <huxm@marvell.com>
> Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
> ---
> v3: Add NULL check for 'btmrvl_plt_dev'
> v4: Moved the bindings file to bindings/net/
>     Corrected the name of 'name' and 'compatible' properties(Rob Herring)
> ---
>  Documentation/devicetree/bindings/btmrvl.txt       | 29 -----------
>  .../devicetree/bindings/net/marvell-bt-sd8xxx.txt  | 29 +++++++++++
>  drivers/bluetooth/Makefile                         |  1 +
>  drivers/bluetooth/btmrvl_drv.h                     | 16 ++++++
>  drivers/bluetooth/btmrvl_main.c                    |  8 ++-
>  drivers/bluetooth/btmrvl_platform.c                | 60 ++++++++++++++++++++++
>  6 files changed, 113 insertions(+), 30 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/btmrvl.txt
>  create mode 100644 Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
>  create mode 100644 drivers/bluetooth/btmrvl_platform.c
> 
> diff --git a/Documentation/devicetree/bindings/btmrvl.txt b/Documentation/devicetree/bindings/btmrvl.txt
> deleted file mode 100644
> index 58f964b..0000000
> --- a/Documentation/devicetree/bindings/btmrvl.txt
> +++ /dev/null
> @@ -1,29 +0,0 @@
> -btmrvl
> -------
> -
> -Required properties:
> -
> -  - compatible : must be "btmrvl,cfgdata"
> -
> -Optional properties:
> -
> -  - btmrvl,cal-data : Calibration data downloaded to the device during
> -		      initialization. This is an array of 28 values(u8).
> -
> -  - btmrvl,gpio-gap : gpio and gap (in msecs) combination to be
> -		      configured.
> -
> -Example:
> -
> -GPIO pin 13 is configured as a wakeup source and GAP is set to 100 msecs
> -in below example.
> -
> -btmrvl {
> -	compatible = "btmrvl,cfgdata";
> -
> -	btmrvl,cal-data = /bits/ 8 <
> -		0x37 0x01 0x1c 0x00 0xff 0xff 0xff 0xff 0x01 0x7f 0x04 0x02
> -		0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
> -		0x00 0x00 0xf0 0x00>;
> -	btmrvl,gpio-gap = <0x0d64>;
> -};
> diff --git a/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
> new file mode 100644
> index 0000000..516b636
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
> @@ -0,0 +1,29 @@
> +Marvell bluetooth sdio driver
> +------
> +
> +Required properties:
> +
> +  - compatible : must be "marvell,bt-sd8xxx"

List specific models, not wildcards.

> +
> +Optional properties:
> +
> +  - btmrvl,cal-data : Calibration data downloaded to the device during
> +		      initialization. This is an array of 28 values(u8).
> +
> +  - btmrvl,gpio-gap : gpio and gap (in msecs) combination to be
> +		      configured.

This needs a better explanation.

> +
> +Example:
> +
> +GPIO pin 13 and gap 100ms are configured for host wakeup, calibration
> +data is also available in below example.
> +
> +bluetooth {

This needs to follow the SDIO bus binding and be a child node of the 
SDIO controller.

> +	compatible = "marvell,bt-sd8xxx";
> +
> +	btmrvl,cal-data = /bits/ 8 <
> +		0x37 0x01 0x1c 0x00 0xff 0xff 0xff 0xff 0x01 0x7f 0x04 0x02
> +		0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
> +		0x00 0x00 0xf0 0x00>;
> +	btmrvl,gpio-gap = <0x0d64>;
> +};

Re: [PATCH v4 2/2] bluetooth: btmrvl: parse host wakeup configuration from device tree

[Rob Herring]

On Tue, Feb 16, 2016 at 01:55:55AM -0800, Amitkumar Karwar wrote:
> From: Xinming Hu <huxm@marvell.com>
> 
> This patch implements a framework for board specific wakeup.
> driver parse irq/gpio number from device tree, corresponding
> resources will be allocated, and used for host suspend/resume.
> Device tree binding file is also updated in the patch.
> 
> Signed-off-by: Xinming Hu <huxm@marvell.com>
> Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
> ---
> v2: Fixed build error reported by kbuild test robot
> drivers/bluetooth/btmrvl_platform.c:141:22: error:
> 'btmrvl_plt_pm_ops' undeclared here (not in a function)
> ---
>  .../devicetree/bindings/net/marvell-bt-sd8xxx.txt  | 17 +++-

Please put all the binding changes into a single patch.

>  drivers/bluetooth/btmrvl_platform.c                | 91 ++++++++++++++++++++++
>  2 files changed, 106 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
> index 516b636..fdc87c4 100644
> --- a/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
> +++ b/Documentation/devicetree/bindings/net/marvell-bt-sd8xxx.txt
> @@ -12,11 +12,19 @@ Optional properties:
>  
>    - btmrvl,gpio-gap : gpio and gap (in msecs) combination to be
>  		      configured.
> +  - interrupt-parent: phandle of the parent interrupt controller
> +  - interrupts : interrupt number to the cpu
> +  - gpios: specify GPIO respectively. gpio here is board specific pin.
> +	   while above gpio-gap represents the device side pin used to
> +	   wakeup host.

wakeup-gpios instead.

> +  - pinctrl-names : a pinctrl state named "default" must be defined
> +  - pinctrl-0 : pin control group to be used for this controller
>  
>  Example:
>  
> -GPIO pin 13 and gap 100ms are configured for host wakeup, calibration
> -data is also available in below example.
> +GPIO pin 119 and gap 100ms are configured for host wakeup,
> +pin 13 is configured so that firmware can wakeup host using this device side
> +pin, calibration data is also available in below example.
>  
>  bluetooth {
>  	compatible = "marvell,bt-sd8xxx";
> @@ -26,4 +34,9 @@ bluetooth {
>  		0x00 0x00 0xba 0xce 0xc0 0xc6 0x2d 0x00 0x00 0x00 0x00 0x00
>  		0x00 0x00 0xf0 0x00>;
>  	btmrvl,gpio-gap = <0x0d64>;
> +	interrupt-parent = <&pio>;
> +	interrupts = <119 IRQ_TYPE_LEVEL_LOW>;
> +	gpios = <&pio 119 GPIO_ACTIVE_HIGH>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&wake_pins>;
>  };
> diff --git a/drivers/bluetooth/btmrvl_platform.c b/drivers/bluetooth/btmrvl_platform.c