[media] media: platform: add VPFE capture driver support for AM437X

This patch adds Video Processing Front End (VPFE) driver for
AM437X family of devices
Driver supports the following:
- V4L2 API using MMAP buffer access based on videobuf2 api
- Asynchronous sensor/decoder sub device registration
- DT support

Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
[hans.verkuil@cisco.com: swapped two lines to fix vpfe_release() & add pinctrl include]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

11 files changed, 3411 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/media/ti-am437x-vpfe.txt b/Documentation/devicetree/bindings/media/ti-am437x-vpfe.txt
new file mode 100644
index 000000000000..3932e766553a
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/ti-am437x-vpfe.txt
@@ -0,0 +1,61 @@
+Texas Instruments AM437x CAMERA (VPFE)
+--------------------------------------
+
+The Video Processing Front End (VPFE) is a key component for image capture
+applications. The capture module provides the system interface and the
+processing capability to connect RAW image-sensor modules and video decoders
+to the AM437x device.
+
+Required properties:
+- compatible: must be "ti,am437x-vpfe"
+- reg: physical base address and length of the registers set for the device;
+- interrupts: should contain IRQ line for the VPFE;
+- ti,am437x-vpfe-interface: can be one of the following,
+        0 - Raw Bayer Interface.
+        1 - 8 Bit BT656 Interface.
+        2 - 10 Bit BT656 Interface.
+        3 - YCbCr 8 Bit Interface.
+        4 - YCbCr 16 Bit Interface.
+
+VPFE supports a single port node with parallel bus. It should contain one
+'port' child node with child 'endpoint' node. Please refer to the bindings
+defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
+
+Example:
+        vpfe: vpfe@f0034000 {
+                compatible = "ti,am437x-vpfe";
+                reg = <0x48328000 0x2000>;
+                interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+
+                pinctrl-names = "default", "sleep";
+                pinctrl-0 = <&vpfe_pins_default>;
+                pinctrl-1 = <&vpfe_pins_sleep>;
+
+                port {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        vpfe0_ep: endpoint {
+                                remote-endpoint = <&ov2659_1>;
+                                ti,am437x-vpfe-interface = <0>;
+                                bus-width = <8>;
+                                hsync-active = <0>;
+                                vsync-active = <0>;
+                        };
+                };
+        };
+
+        i2c1: i2c@4802a000 {
+
+                ov2659@30 {
+                        compatible = "ti,ov2659";
+                        reg = <0x30>;
+
+                        port {
+                                ov2659_1: endpoint {
+                                        remote-endpoint = <&vpfe0_ep>;
+                                        bus-width = <8>;
+                                        mclk-frequency = <12000000>;
+                                };
+                        };
+        };
diff --git a/MAINTAINERS b/MAINTAINERS
index dc2d91252d8b..4318f348dbd8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8745,6 +8745,15 @@ S:	Maintained
 F:      drivers/media/platform/davinci/
 F:      include/media/davinci/
 
+TI AM437X VPFE DRIVER
+M:      Lad, Prabhakar <prabhakar.csengg@gmail.com>
+L:      linux-media@vger.kernel.org
+W:      http://linuxtv.org/
+Q:      http://patchwork.linuxtv.org/project/linux-media/list/
+T:      git git://linuxtv.org/mhadli/v4l-dvb-davinci_devices.git
+S:      Maintained
+F:      drivers/media/platform/am437x/
+
 SIS 190 ETHERNET DRIVER
 M:      Francois Romieu <romieu@fr.zoreil.com>
 L:      netdev@vger.kernel.org
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 480a174832a6..71e8873ceb94 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -118,6 +118,7 @@ config VIDEO_S3C_CAMIF
 source "drivers/media/platform/soc_camera/Kconfig"
 source "drivers/media/platform/exynos4-is/Kconfig"
 source "drivers/media/platform/s5p-tv/Kconfig"
+source "drivers/media/platform/am437x/Kconfig"
 
 endif # V4L_PLATFORM_DRIVERS
 
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index a49936b8ce8a..3ec154742083 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -46,4 +46,6 @@ obj-$(CONFIG_VIDEO_RENESAS_VSP1)	+= vsp1/
 
 obj-y   += omap/
 
+obj-$(CONFIG_VIDEO_AM437X_VPFE)         += am437x/
+
 ccflags-y += -I$(srctree)/drivers/media/i2c
diff --git a/drivers/media/platform/am437x/Kconfig b/drivers/media/platform/am437x/Kconfig
new file mode 100644
index 000000000000..7b023a76e32e
--- /dev/null
+++ b/drivers/media/platform/am437x/Kconfig
@@ -0,0 +1,11 @@
+config VIDEO_AM437X_VPFE
+        tristate "TI AM437x VPFE video capture driver"
+        depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+        depends on SOC_AM43XX || COMPILE_TEST
+        select VIDEOBUF2_DMA_CONTIG
+        help
+           Support for AM437x Video Processing Front End based Video
+           Capture Driver.
+
+           To compile this driver as a module, choose M here. The module
+           will be called am437x-vpfe.
diff --git a/drivers/media/platform/am437x/Makefile b/drivers/media/platform/am437x/Makefile
new file mode 100644
index 000000000000..d11fff16f260
--- /dev/null
+++ b/drivers/media/platform/am437x/Makefile
@@ -0,0 +1,3 @@
+# Makefile for AM437x VPFE driver
+
+obj-$(CONFIG_VIDEO_AM437X_VPFE) += am437x-vpfe.o
diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
new file mode 100644
index 000000000000..e01ac22d6244
--- /dev/null
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -0,0 +1,2778 @@
+/*
+ * TI VPFE capture Driver
+ *
+ * Copyright (C) 2013 - 2014 Texas Instruments, Inc.
+ *
+ * Benoit Parrot <bparrot@ti.com>
+ * Lad, Prabhakar <prabhakar.csengg@gmail.com>
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-of.h>
+
+#include "am437x-vpfe.h"
+