[media] Add the via framebuffer camera controller driver

Add a driver for the video capture port on VIA integrated chipsets.  This
version has a remaining OLPCism or two and expects to be talking to an
ov7670; those can be improved as the need arises.

This work was supported by the One Laptop Per Child project.
Thanks to Laurent Pinchart for a number of useful comments.

Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

8 files changed, 1601 insertions, 4 deletions

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 2d4226710ed5..0efbb29a1a08 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -712,6 +712,16 @@ config VIDEO_SR030PC30
         ---help---
           This driver supports SR030PC30 VGA camera from Siliconfile
 
+config VIDEO_VIA_CAMERA
+        tristate "VIAFB camera controller support"
+        depends on FB_VIA
+        select VIDEOBUF_DMA_SG
+        select VIDEO_OV7670
+        help
+           Driver support for the integrated camera controller in VIA
+           Chrome9 chipsets.  Currently only tested on OLPC xo-1.5 systems
+           with ov7670 sensors.
+
 config SOC_CAMERA
         tristate "SoC camera support"
         depends on VIDEO_V4L2 && HAS_DMA && I2C
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index d5e49ddbf9dd..af79d476a4c8 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -122,6 +122,8 @@ obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o
 
 obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
 
+obj-$(CONFIG_VIDEO_VIA_CAMERA) += via-camera.o
+
 obj-$(CONFIG_USB_DABUSB)        += dabusb.o
 obj-$(CONFIG_USB_SE401)         += se401.o
 obj-$(CONFIG_USB_ZR364XX)       += zr364xx.o
diff --git a/drivers/media/video/via-camera.c b/drivers/media/video/via-camera.c
new file mode 100644
index 000000000000..02a21bccae18
--- /dev/null
+++ b/drivers/media/video/via-camera.c
@@ -0,0 +1,1474 @@
+/*
+ * Driver for the VIA Chrome integrated camera controller.
+ *
+ * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net>
+ * Distributable under the terms of the GNU General Public License, version 2
+ *
+ * This work was supported by the One Laptop Per Child project
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/videobuf-dma-sg.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/pm_qos_params.h>
+#include <linux/via-core.h>
+#include <linux/via-gpio.h>
+#include <linux/via_i2c.h>
+
+#include "via-camera.h"
+
+MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
+MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");
+MODULE_LICENSE("GPL");
+
+static int flip_image;
+module_param(flip_image, bool, 0444);
+MODULE_PARM_DESC(flip_image,
+                "If set, the sensor will be instructed to flip the image "
+                "vertically.");
+
+#ifdef CONFIG_OLPC_XO_1_5
+static int override_serial;
+module_param(override_serial, bool, 0444);
+MODULE_PARM_DESC(override_serial,
+                "The camera driver will normally refuse to load if "
+                "the XO 1.5 serial port is enabled.  Set this option "
+                "to force the issue.");
+#endif
+
+/*
+ * Basic window sizes.
+ */
+#define VGA_WIDTH       640
+#define VGA_HEIGHT      480
+#define QCIF_WIDTH      176
+#define QCIF_HEIGHT     144
+
+/*
+ * The structure describing our camera.
+ */
+enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };
+
+struct via_camera {
+        struct v4l2_device v4l2_dev;
+        struct video_device vdev;
+        struct v4l2_subdev *sensor;
+        struct platform_device *platdev;
+        struct viafb_dev *viadev;
+        struct mutex lock;
+        enum viacam_opstate opstate;
+        unsigned long flags;
+        struct pm_qos_request_list qos_request;
+        /*
+         * GPIO info for power/reset management
+         */
+        int power_gpio;
+        int reset_gpio;
+        /*
+         * I/O memory stuff.
+         */
+        void __iomem *mmio;     /* Where the registers live */
+        void __iomem *fbmem;    /* Frame buffer memory */
+        u32 fb_offset;          /* Reserved memory offset (FB) */
+        /*
+         * Capture buffers and related.  The controller supports
+         * up to three, so that's what we have here.  These buffers
+         * live in frame buffer memory, so we don't call them "DMA".
+         */
+        unsigned int cb_offsets[3];     /* offsets into fb mem */
+        u8 *cb_addrs[3];                /* Kernel-space addresses */
+        int n_cap_bufs;                 /* How many are we using? */
+        int next_buf;
+        struct videobuf_queue vb_queue;
+        struct list_head buffer_queue;  /* prot. by reg_lock */
+        /*
+         * User tracking.
+         */
+        int users;
+        struct file *owner;
+        /*
+         * Video format information.  sensor_format is kept in a form
+         * that we can use to pass to the sensor.  We always run the
+         * sensor in VGA resolution, though, and let the controller
+         * downscale things if need be.  So we keep the "real*
+         * dimensions separately.
+         */
+        struct v4l2_pix_format sensor_format;
+        struct v4l2_pix_format user_format;
+        enum v4l2_mbus_pixelcode mbus_code;
+};
+
+/*
+ * Yes, this is a hack, but there's only going to be one of these
+ * on any system we know of.
+ */
+static struct via_camera *via_cam_info;
+
+/*
+ * Flag values, manipulated with bitops
+ */
+#define CF_DMA_ACTIVE    0      /* A frame is incoming */
+#define CF_CONFIG_NEEDED 1      /* Must configure hardware */
+
+
+/*
+ * Nasty ugly v4l2 boilerplate.
+ */
+#define sensor_call(cam, optype, func, args...) \
+        v4l2_subdev_call(cam->sensor, optype, func, ##args)
+
+/*
+ * Debugging and related.
+ */
+#define cam_err(cam, fmt, arg...) \
+        dev_err(&(cam)->platdev->dev, fmt, ##arg);
+#define cam_warn(cam, fmt, arg...) \
+        dev_warn(&(cam)->platdev->dev, fmt, ##arg);
+#define cam_dbg(cam, fmt, arg...) \
+        dev_dbg(&(cam)->platdev->dev, fmt, ##arg);
+
+/*
+ * Format handling.  This is ripped almost directly from Hans's changes
+ * to cafe_ccic.c.  It's a little unfortunate; until this change, we