[PATCH RFC v2] [media] blackfin: add video display device driver

[Scott Jiang <scott.jiang.linux@gmail.com>]

This is a V4L2 driver for Blackfin video display (E)PPI interface.
This module is common for BF537/BF561/BF548/BF609.

Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com>
---
 drivers/media/platform/blackfin/Kconfig        |   15 +-
 drivers/media/platform/blackfin/Makefile       |    1 +
 drivers/media/platform/blackfin/bfin_display.c |  934 ++++++++++++++++++++++++
 include/media/blackfin/bfin_display.h          |   38 +
 4 files changed, 986 insertions(+), 2 deletions(-)
 create mode 100644 drivers/media/platform/blackfin/bfin_display.c
 create mode 100644 include/media/blackfin/bfin_display.h

diff --git a/drivers/media/platform/blackfin/Kconfig b/drivers/media/platform/blackfin/Kconfig
index cc23997..10aa435 100644
--- a/drivers/media/platform/blackfin/Kconfig
+++ b/drivers/media/platform/blackfin/Kconfig
@@ -9,7 +9,18 @@ config VIDEO_BLACKFIN_CAPTURE
 	  To compile this driver as a module, choose M here: the
 	  module will be called bfin_capture.
 
+config VIDEO_BLACKFIN_DISPLAY
+	tristate "Blackfin Video Display Driver"
+	depends on VIDEO_V4L2 && BLACKFIN && I2C
+	select VIDEOBUF2_DMA_CONTIG
+	help
+	  V4L2 driver for Blackfin video display (E)PPI interface.
+	  This module is common for BF537/BF561/BF548/BF609.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bfin_display.
+
 config VIDEO_BLACKFIN_PPI
 	tristate
-	depends on VIDEO_BLACKFIN_CAPTURE
-	default VIDEO_BLACKFIN_CAPTURE
+	depends on VIDEO_BLACKFIN_CAPTURE || VIDEO_BLACKFIN_DISPLAY
+	default VIDEO_BLACKFIN_CAPTURE || VIDEO_BLACKFIN_DISPLAY
diff --git a/drivers/media/platform/blackfin/Makefile b/drivers/media/platform/blackfin/Makefile
index 30421bc..015c8f0 100644
--- a/drivers/media/platform/blackfin/Makefile
+++ b/drivers/media/platform/blackfin/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_VIDEO_BLACKFIN_CAPTURE) += bfin_capture.o
+obj-$(CONFIG_VIDEO_BLACKFIN_DISPLAY) += bfin_display.o
 obj-$(CONFIG_VIDEO_BLACKFIN_PPI)     += ppi.o
diff --git a/drivers/media/platform/blackfin/bfin_display.c b/drivers/media/platform/blackfin/bfin_display.c
new file mode 100644
index 0000000..448f196
--- /dev/null
+++ b/drivers/media/platform/blackfin/bfin_display.c
@@ -0,0 +1,934 @@
+/*
+ * Analog Devices video display driver for (E)PPI interface
+ *
+ * Copyright (c) 2011 - 2013 Analog Devices Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/types.h>
+
+#include <media/v4l2-chip-ident.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include <asm/dma.h>
+
+#include <media/blackfin/bfin_display.h>
+#include <media/blackfin/ppi.h>
+
+#define DISPLAY_DRV_NAME        "bfin_display"
+#define DISP_MIN_NUM_BUF        2
+
+struct bfin_disp_format {
+	char *desc;
+	u32 pixelformat;
+	enum v4l2_mbus_pixelcode mbus_code;
+	int bpp; /* bits per pixel */
+	int dlen; /* data length for ppi in bits */
+};
+
+struct bfin_disp_buffer {
+	struct vb2_buffer vb;
+	struct list_head list;
+};
+
+struct bfin_disp_device {
+	/* display device instance */
+	struct v4l2_device v4l2_dev;
+	/* v4l2 control handler */
+	struct v4l2_ctrl_handler ctrl_handler;
+	/* device node data */
+	struct video_device video_dev;
+	/* sub device instance */
+	struct v4l2_subdev *sd;
+	/* display config */
+	struct bfin_display_config *cfg;
+	/* ppi interface */
+	struct ppi_if *ppi;
+	/* current output */
+	unsigned int cur_output;
+	/* current selected standard */
+	v4l2_std_id std;
+	/* current selected dv_timings */
+	struct v4l2_dv_timings dv_timings;
+	/* used to store pixel format */
+	struct v4l2_pix_format fmt;
+	/* bits per pixel*/
+	int bpp;
+	/* data length for ppi in bits */
+	int dlen;
+	/* used to store encoder supported format */
+	struct bfin_disp_format *enc_formats;
+	/* number of encoder formats array */
+	int num_enc_formats;
+	/* pointing to current video buffer */
+	struct bfin_disp_buffer *cur_frm;
+	/* buffer queue used in videobuf2 */
+	struct vb2_queue buffer_queue;
+	/* allocator-specific contexts for each plane */
+	struct vb2_alloc_ctx *alloc_ctx;
+	/* queue of filled frames */
+	struct list_head dma_queue;
+	/* used in videobuf2 callback */
+	spinlock_t lock;
+	/* used to serialize all ioctls */
+	struct mutex mutex;
+	/* used to serialize all queuing ioctls */
+	struct mutex qlock;
+};
+
+static const struct bfin_disp_format bfin_disp_formats[] = {
+	{
+		.desc        = "YCbCr 4:2:2 Interleaved UYVY 8bits",
+		.pixelformat = V4L2_PIX_FMT_UYVY,
+		.mbus_code   = V4L2_MBUS_FMT_UYVY8_2X8,
+		.bpp         = 16,
+		.dlen        = 8,
+	},
+	{
+		.desc        = "YCbCr 4:2:2 Interleaved YUYV 8bits",
+		.pixelformat = V4L2_PIX_FMT_YUYV,
+		.mbus_code   = V4L2_MBUS_FMT_YUYV8_2X8,
+		.bpp         = 16,
+		.dlen        = 8,
+	},
+	{
+		.desc        = "YCbCr 4:2:2 Interleaved UYVY 16bits",
+		.pixelformat = V4L2_PIX_FMT_UYVY,
+		.mbus_code   = V4L2_MBUS_FMT_UYVY8_1X16,
+		.bpp         = 16,
+		.dlen        = 16,
+	},
+	{
+		.desc        = "RGB 565",
+		.pixelformat = V4L2_PIX_FMT_RGB565,
+		.mbus_code   = V4L2_MBUS_FMT_RGB565_2X8_LE,
+		.bpp         = 16,
+		.dlen        = 8,
+	},
+	{
+		.desc        = "RGB 444",
+		.pixelformat = V4L2_PIX_FMT_RGB444,
+		.mbus_code   = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE,
+		.bpp         = 16,
+		.dlen        = 8,
+	},
+
+};
+#define DISP_MAX_FMTS ARRAY_SIZE(bfin_disp_formats)
+
+static struct bfin_disp_buffer *to_bfin_disp_vb(struct vb2_buffer *vb)
+{
+	return container_of(vb, struct bfin_disp_buffer, vb);
+}
+
+static int bfin_disp_init_encoder_formats(struct bfin_disp_device *disp)
+{
+	enum v4l2_mbus_pixelcode code;
+	struct bfin_disp_format *df;
+	unsigned int num_formats = 0;
+	int i, j;
+
+	while (!v4l2_subdev_call(disp->sd, video,
+				enum_mbus_fmt, num_formats, &code))
+		num_formats++;
+	if (!num_formats)
+		return -ENXIO;
+
+	df = kzalloc(num_formats * sizeof(*df), GFP_KERNEL);
+	if (!df)
+		return -ENOMEM;
+
+	for (i = 0; i < num_formats; i++) {
+		v4l2_subdev_call(disp->sd, video,
+				enum_mbus_fmt, i, &code);
+		for (j = 0; j < DISP_MAX_FMTS; j++)
+			if (code == bfin_disp_formats[j].mbus_code)
+				break;
+		if (j == DISP_MAX_FMTS) {
+			/* we don't allow this encoder working with our bridge */
+			kfree(df);
+			return -EINVAL;
+		}
+		df[i] = bfin_disp_formats[j];
+	}
+	disp->enc_formats = df;
+	disp->num_enc_formats = num_formats;
+	return 0;
+}
+
+static void bfin_disp_free_encoder_formats(struct bfin_disp_device *disp)
+{
+	disp->num_enc_formats = 0;
+	kfree(disp->enc_formats);
+	disp->enc_formats = NULL;
+}
+
+static int bfin_disp_queue_setup(struct vb2_queue *vq,
+				const struct v4l2_format *fmt,
+				unsigned int *nbuffers, unsigned int *nplanes,
+				unsigned int sizes[], void *alloc_ctxs[])
+{
+	struct bfin_disp_device *disp = vb2_get_drv_priv(vq);
+
+	if (*nbuffers < DISP_MIN_NUM_BUF)
+		*nbuffers = DISP_MIN_NUM_BUF;
+
+	*nplanes = 1;
+	sizes[0] = disp->fmt.sizeimage;
+	alloc_ctxs[0] = disp->alloc_ctx;
+
+	return 0;
+}
+
+static int bfin_disp_buffer_init(struct vb2_buffer *vb)
+{
+	struct bfin_disp_buffer *buf = to_bfin_disp_vb(vb);
+
+	INIT_LIST_HEAD(&buf->list);
+	return 0;
+}
+
+static int bfin_disp_buffer_prepare(struct vb2_buffer *vb)
+{
+	struct bfin_disp_device *disp = vb2_get_drv_priv(vb->vb2_queue);
+	struct bfin_disp_buffer *buf = to_bfin_disp_vb(vb);
+	unsigned long size;
+
+	size = disp->fmt.sizeimage;
+	if (vb2_plane_size(vb, 0) < size) {
+		v4l2_err(&disp->v4l2_dev, "buffer too small (%lu < %lu)\n",
+				vb2_plane_size(vb, 0), size);
+		return -EINVAL;
+	}
+	vb2_set_plane_payload(&buf->vb, 0, size);
+
+	return 0;
+}
+
+static void bfin_disp_buffer_queue(struct vb2_buffer *vb)
+{
+	struct bfin_disp_device *disp = vb2_get_drv_priv(vb->vb2_queue);
+	struct bfin_disp_buffer *buf = to_bfin_disp_vb(vb);
+	unsigned long flags;
+
+	spin_lock_irqsave(&disp->lock, flags);
+	list_add_tail(&buf->list, &disp->dma_queue);
+	spin_unlock_irqrestore(&disp->lock, flags);
+}
+
+static void bfin_disp_buffer_cleanup(struct vb2_buffer *vb)
+{
+	struct bfin_disp_device *disp = vb2_get_drv_priv(vb->vb2_queue);
+	struct bfin_disp_buffer *buf = to_bfin_disp_vb(vb);
+	unsigned long flags;
+
+	spin_lock_irqsave(&disp->lock, flags);
+	list_del_init(&buf->list);
+	spin_unlock_irqrestore(&disp->lock, flags);
+}
+
+static irqreturn_t bfin_disp_isr(int irq, void *dev_id)
+{
+	struct ppi_if *ppi = dev_id;
+	struct bfin_disp_device *disp = ppi->priv;
+	struct vb2_buffer *vb = &disp->cur_frm->vb;
+	dma_addr_t addr;
+
+	spin_lock(&disp->lock);
+
+	if (!list_empty(&disp->dma_queue)) {
+		v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
+		vb->v4l2_buf.flags |= V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+		vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
+		disp->cur_frm = list_entry(disp->dma_queue.next,
+				struct bfin_disp_buffer, list);
+		list_del(&disp->cur_frm->list);
+	}
+
+	clear_dma_irqstat(ppi->info->dma_ch);
+
+	addr = vb2_dma_contig_plane_dma_addr(&disp->cur_frm->vb, 0);
+	ppi->ops->update_addr(ppi, (unsigned long)addr);
+	ppi->ops->start(ppi);
+
+	spin_unlock(&disp->lock);
+
+	return IRQ_HANDLED;
+}
+
+static int bfin_disp_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct bfin_disp_device *disp = vb2_get_drv_priv(vq);
+	struct ppi_if *ppi = disp->ppi;
+	struct ppi_params params;
+	dma_addr_t addr;
+	unsigned long flags;
+	int ret;
+
+	/* enable streamon on the sub device */
+	ret = v4l2_subdev_call(disp->sd, video, s_stream, 1);
+	if (ret && (ret != -ENOIOCTLCMD)) {
+		v4l2_err(&disp->v4l2_dev, "stream on failed in subdev\n");
+		return ret;
+	}
+
+	/* set ppi params */
+	params.width = disp->fmt.width;
+	params.height = disp->fmt.height;
+	params.bpp = disp->bpp;
+	params.dlen = disp->dlen;
+	params.ppi_control = disp->cfg->ppi_control;
+	params.int_mask = disp->cfg->int_mask;
+	if (disp->cfg->outputs[disp->cur_output].capabilities
+			& V4L2_IN_CAP_DV_TIMINGS) {
+		struct v4l2_bt_timings *bt = &disp->dv_timings.bt;
+
+		params.hdelay = bt->hsync + bt->hbackporch;
+		params.vdelay = bt->vsync + bt->vbackporch;
+		params.line = bt->hfrontporch + bt->hsync
+				+ bt->hbackporch + bt->width;
+		params.frame = bt->vfrontporch + bt->vsync
+				+ bt->vbackporch + bt->height;
+		if (bt->interlaced)
+			params.frame += bt->il_vfrontporch + bt->il_vsync
+					+ bt->il_vbackporch;
+		params.hsync = bt->hsync;
+		params.vsync = bt->vsync;
+	} else if (disp->cfg->outputs[disp->cur_output].capabilities
+			& V4L2_IN_CAP_STD) {
+		params.hdelay = 0;
+		params.vdelay = 0;
+		if (disp->std & V4L2_STD_525_60) {
+			params.line = 858;
+			params.frame = 525;
+		} else {
+			params.line = 864;
+			params.frame = 625;
+		}
+	} else {
+		params.hdelay = 0;
+		params.vdelay = 0;
+		params.line = params.width + disp->cfg->blank_pixels;
+		params.frame = params.height;
+	}
+	ret = ppi->ops->set_params(ppi, &params);
+	if (ret < 0) {
+		v4l2_err(&disp->v4l2_dev,
+				"set ppi params failed\n");
+		return ret;
+	}
+
+	/* attach ppi DMA irq handler */
+	ret = ppi->ops->attach_irq(ppi, bfin_disp_isr);
+	if (ret < 0) {
+		v4l2_err(&disp->v4l2_dev,
+				"attach interrupt handler failed\n");
+		return ret;
+	}
+
+	spin_lock_irqsave(&disp->lock, flags);
+	/* if dma queue is empty, return error */
+	if (list_empty(&disp->dma_queue)) {
+		spin_unlock_irqrestore(&disp->lock, flags);
+		v4l2_err(&disp->v4l2_dev, "dma queue is empty\n");
+		return -EINVAL;
+	}
+
+	/* get the next frame from the dma queue */
+	disp->cur_frm = list_entry(disp->dma_queue.next,
+					struct bfin_disp_buffer, list);
+	/* remove buffer from the dma queue */
+	list_del(&disp->cur_frm->list);
+	spin_unlock_irqrestore(&disp->lock, flags);
+
+	addr = vb2_dma_contig_plane_dma_addr(&disp->cur_frm->vb, 0);
+	/* update DMA address */
+	ppi->ops->update_addr(ppi, (unsigned long)addr);
+	/* enable ppi */
+	ppi->ops->start(ppi);
+
+	return 0;
+}
+
+static int bfin_disp_stop_streaming(struct vb2_queue *vq)
+{
+	struct bfin_disp_device *disp = vb2_get_drv_priv(vq);
+	struct ppi_if *ppi = disp->ppi;
+	unsigned long flags;
+	int ret;
+
+	if (!vb2_is_streaming(vq))
+		return 0;
+
+	ppi->ops->stop(ppi);
+	ppi->ops->detach_irq(ppi);
+	ret = v4l2_subdev_call(disp->sd, video, s_stream, 0);
+	if (ret && (ret != -ENOIOCTLCMD))
+		v4l2_err(&disp->v4l2_dev,
+				"stream off failed in subdev\n");
+
+	spin_lock_irqsave(&disp->lock, flags);
+	/* release all active buffers */
+	while (!list_empty(&disp->dma_queue)) {
+		disp->cur_frm = list_entry(disp->dma_queue.next,
+						struct bfin_disp_buffer, list);
+		list_del(&disp->cur_frm->list);
+		vb2_buffer_done(&disp->cur_frm->vb, VB2_BUF_STATE_ERROR);
+	}
+	spin_unlock_irqrestore(&disp->lock, flags);
+	return 0;
+}
+
+static struct vb2_ops bfin_disp_video_qops = {
+	.queue_setup            = bfin_disp_queue_setup,
+	.buf_init               = bfin_disp_buffer_init,
+	.buf_prepare            = bfin_disp_buffer_prepare,
+	.buf_cleanup            = bfin_disp_buffer_cleanup,
+	.buf_queue              = bfin_disp_buffer_queue,
+	.wait_prepare           = vb2_ops_wait_prepare,
+	.wait_finish            = vb2_ops_wait_finish,
+	.start_streaming        = bfin_disp_start_streaming,
+	.stop_streaming         = bfin_disp_stop_streaming,
+};
+
+static int bfin_disp_g_std(struct file *file, void *priv, v4l2_std_id *std)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_display_config *config = disp->cfg;
+
+	if (!(config->outputs[disp->cur_output].capabilities
+			& V4L2_IN_CAP_STD))
+		return -ENODATA;
+
+	*std = disp->std;
+	return 0;
+}
+
+static int bfin_disp_s_std(struct file *file, void *priv, v4l2_std_id *std)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_display_config *config = disp->cfg;
+	int ret;
+
+	if (vb2_is_busy(&disp->buffer_queue))
+		return -EBUSY;
+
+	if (!(config->outputs[disp->cur_output].capabilities
+			& V4L2_IN_CAP_STD))
+		return -ENODATA;
+
+	ret = v4l2_subdev_call(disp->sd, video, s_std_output, *std);
+	if (ret < 0)
+		return ret;
+
+	disp->std = *std;
+	return 0;
+}
+
+static int bfin_disp_g_dv_timings(struct file *file, void *priv,
+				struct v4l2_dv_timings *timings)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_display_config *config = disp->cfg;
+	int ret;
+
+	if (!(config->outputs[disp->cur_output].capabilities
+			& V4L2_IN_CAP_DV_TIMINGS))
+		return -ENODATA;
+
+	ret = v4l2_subdev_call(disp->sd, video,
+				g_dv_timings, timings);
+	if (ret < 0)
+		return ret;
+
+	disp->dv_timings = *timings;
+	return 0;
+}
+
+static int bfin_disp_s_dv_timings(struct file *file, void *priv,
+				struct v4l2_dv_timings *timings)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_display_config *config = disp->cfg;
+	int ret;
+
+	if (vb2_is_busy(&disp->buffer_queue))
+		return -EBUSY;
+
+	if (!(config->outputs[disp->cur_output].capabilities
+			& V4L2_IN_CAP_DV_TIMINGS))
+		return -ENODATA;
+
+	ret = v4l2_subdev_call(disp->sd, video, s_dv_timings, timings);
+	if (ret < 0)
+		return ret;
+
+	disp->dv_timings = *timings;
+	return 0;
+}
+
+static int bfin_disp_enum_output(struct file *file, void *priv,
+				struct v4l2_output *output)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_display_config *config = disp->cfg;
+
+	if (output->index >= config->num_outputs)
+		return -EINVAL;
+
+	*output = config->outputs[output->index];
+	return 0;
+}
+
+static int bfin_disp_g_output(struct file *file, void *priv, unsigned int *index)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+
+	*index = disp->cur_output;
+	return 0;
+}
+
+static int bfin_disp_s_output(struct file *file, void *priv, unsigned int index)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_display_config *config = disp->cfg;
+	struct disp_route *route;
+	int ret;
+
+	if (vb2_is_busy(&disp->buffer_queue))
+		return -EBUSY;
+
+	if (index >= config->num_outputs)
+		return -EINVAL;
+
+	route = &config->routes[index];
+	ret = v4l2_subdev_call(disp->sd, video, s_routing,
+				0, route->output, route->config);
+	if ((ret < 0) && (ret != -ENOIOCTLCMD)) {
+		v4l2_err(&disp->v4l2_dev, "Failed to set output\n");
+		return ret;
+	}
+	disp->cur_output = index;
+	/* update tvnorms from the subdevice */
+	disp->video_dev.tvnorms = config->outputs[index].std;
+	/* if this route has specific config, update ppi control */
+	if (route->ppi_control)
+		config->ppi_control = route->ppi_control;
+	return 0;
+}
+
+static int bfin_disp_try_format(struct bfin_disp_device *disp,
+				struct v4l2_pix_format *pixfmt,
+				struct bfin_disp_format *bfin_disp_fmt)
+{
+	struct bfin_disp_format *df = disp->enc_formats;
+	struct bfin_disp_format *fmt = NULL;
+	struct v4l2_mbus_framefmt mbus_fmt;
+	int ret, i;
+
+	for (i = 0; i < disp->num_enc_formats; i++) {
+		fmt = &df[i];
+		if (pixfmt->pixelformat == fmt->pixelformat)
+			break;
+	}
+	if (i == disp->num_enc_formats)
+		fmt = &df[0];
+
+	v4l2_fill_mbus_format(&mbus_fmt, pixfmt, fmt->mbus_code);
+	ret = v4l2_subdev_call(disp->sd, video,
+				try_mbus_fmt, &mbus_fmt);
+	if (ret < 0)
+		return ret;
+	v4l2_fill_pix_format(pixfmt, &mbus_fmt);
+	if (bfin_disp_fmt) {
+		for (i = 0; i < disp->num_enc_formats; i++) {
+			fmt = &df[i];
+			if (mbus_fmt.code == fmt->mbus_code)
+				break;
+		}
+		*bfin_disp_fmt = *fmt;
+	}
+	pixfmt->bytesperline = pixfmt->width * fmt->bpp / 8;
+	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
+	return 0;
+}
+
+static int bfin_disp_enum_fmt_vid_out(struct file *file, void  *priv,
+					struct v4l2_fmtdesc *fmt)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct bfin_disp_format *df = disp->enc_formats;
+
+	if (fmt->index >= disp->num_enc_formats)
+		return -EINVAL;
+
+	strlcpy(fmt->description,
+		df[fmt->index].desc,
+		sizeof(fmt->description));
+	fmt->pixelformat = df[fmt->index].pixelformat;
+	return 0;
+}
+
+static int bfin_disp_try_fmt_vid_out(struct file *file, void *priv,
+					struct v4l2_format *fmt)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
+
+	return bfin_disp_try_format(disp, pixfmt, NULL);
+}
+
+static int bfin_disp_g_fmt_vid_out(struct file *file, void *priv,
+				struct v4l2_format *fmt)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+
+	fmt->fmt.pix = disp->fmt;
+	return 0;
+}
+
+static int bfin_disp_s_fmt_vid_out(struct file *file, void *priv,
+				struct v4l2_format *fmt)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	struct v4l2_mbus_framefmt mbus_fmt;
+	struct bfin_disp_format bfin_disp_fmt;
+	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
+	int ret;
+
+	if (vb2_is_busy(&disp->buffer_queue))
+		return -EBUSY;
+
+	/* see if format works */
+	ret = bfin_disp_try_format(disp, pixfmt, &bfin_disp_fmt);
+	if (ret < 0)
+		return ret;
+
+	v4l2_fill_mbus_format(&mbus_fmt, pixfmt, bfin_disp_fmt.mbus_code);
+	ret = v4l2_subdev_call(disp->sd, video, s_mbus_fmt, &mbus_fmt);
+	if (ret < 0)
+		return ret;
+	disp->fmt = *pixfmt;
+	disp->bpp = bfin_disp_fmt.bpp;
+	disp->dlen = bfin_disp_fmt.dlen;
+	return 0;
+}
+
+static int bfin_disp_querycap(struct file *file, void  *priv,
+				struct v4l2_capability *cap)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+
+	cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+	strlcpy(cap->driver, DISPLAY_DRV_NAME, sizeof(cap->driver));
+	strlcpy(cap->bus_info, "Blackfin Platform", sizeof(cap->bus_info));
+	strlcpy(cap->card, disp->cfg->card_name, sizeof(cap->card));
+	return 0;
+}
+
+static int bfin_disp_g_parm(struct file *file, void *fh,
+				struct v4l2_streamparm *a)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+
+	return v4l2_subdev_call(disp->sd, video, g_parm, a);
+}
+
+static int bfin_disp_s_parm(struct file *file, void *fh,
+				struct v4l2_streamparm *a)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+
+	return v4l2_subdev_call(disp->sd, video, s_parm, a);
+}
+
+static int bfin_disp_log_status(struct file *file, void *priv)
+{
+	struct bfin_disp_device *disp = video_drvdata(file);
+	/* status for sub devices */
+	v4l2_device_call_all(&disp->v4l2_dev, 0, core, log_status);
+	return 0;
+}
+
+static const struct v4l2_ioctl_ops bfin_disp_ioctl_ops = {
+	.vidioc_querycap         = bfin_disp_querycap,
+	.vidioc_g_fmt_vid_out    = bfin_disp_g_fmt_vid_out,
+	.vidioc_enum_fmt_vid_out = bfin_disp_enum_fmt_vid_out,
+	.vidioc_s_fmt_vid_out    = bfin_disp_s_fmt_vid_out,
+	.vidioc_try_fmt_vid_out  = bfin_disp_try_fmt_vid_out,
+	.vidioc_enum_output      = bfin_disp_enum_output,
+	.vidioc_g_output         = bfin_disp_g_output,
+	.vidioc_s_output         = bfin_disp_s_output,
+	.vidioc_s_std            = bfin_disp_s_std,
+	.vidioc_g_std            = bfin_disp_g_std,
+	.vidioc_s_dv_timings     = bfin_disp_s_dv_timings,
+	.vidioc_g_dv_timings     = bfin_disp_g_dv_timings,
+	.vidioc_reqbufs          = vb2_ioctl_reqbufs,
+	.vidioc_querybuf         = vb2_ioctl_querybuf,
+	.vidioc_qbuf             = vb2_ioctl_qbuf,
+	.vidioc_dqbuf            = vb2_ioctl_dqbuf,
+	.vidioc_streamon         = vb2_ioctl_streamon,
+	.vidioc_streamoff        = vb2_ioctl_streamoff,
+	.vidioc_g_parm           = bfin_disp_g_parm,
+	.vidioc_s_parm           = bfin_disp_s_parm,
+	.vidioc_log_status       = bfin_disp_log_status,
+};
+
+static struct v4l2_file_operations bfin_disp_fops = {
+	.owner = THIS_MODULE,
+	.open = v4l2_fh_open,
+	.release = vb2_fop_release,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+#ifndef CONFIG_MMU
+	.get_unmapped_area = vb2_fop_get_unmapped_area,
+#endif
+	.poll = vb2_fop_poll,
+};
+
+static int bfin_disp_probe(struct platform_device *pdev)
+{
+	struct bfin_disp_device *disp;
+	struct video_device *vfd;
+	struct i2c_adapter *i2c_adap;
+	struct bfin_display_config *config;
+	struct vb2_queue *q;
+	struct disp_route *route;
+	int ret;
+
+	config = pdev->dev.platform_data;
+	if (!config || !config->num_outputs) {
+		v4l2_err(pdev->dev.driver, "Invalid board config\n");
+		return -ENODEV;
+	}
+
+	disp = kzalloc(sizeof(*disp), GFP_KERNEL);
+	if (!disp)
+		return -ENOMEM;
+
+	disp->cfg = config;
+
+	disp->ppi = ppi_create_instance(config->ppi_info);
+	if (!disp->ppi) {
+		ret = -ENODEV;
+		goto err_free_dev;
+	}
+	disp->ppi->priv = disp;
+
+	disp->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
+	if (IS_ERR(disp->alloc_ctx)) {
+		ret = PTR_ERR(disp->alloc_ctx);
+		goto err_free_ppi;
+	}
+
+	ret = v4l2_device_register(&pdev->dev, &disp->v4l2_dev);
+	if (ret) {
+		v4l2_err(pdev->dev.driver,
+				"Unable to register v4l2 device\n");
+		goto err_cleanup_ctx;
+	}
+
+	disp->v4l2_dev.ctrl_handler = &disp->ctrl_handler;
+	ret = v4l2_ctrl_handler_init(&disp->ctrl_handler, 0);
+	if (ret) {
+		v4l2_err(&disp->v4l2_dev,
+				"Unable to init control handler\n");
+		goto err_unreg_v4l2;
+	}
+
+	spin_lock_init(&disp->lock);
+	mutex_init(&disp->mutex);
+	mutex_init(&disp->qlock);
+	/* init video dma queues */
+	INIT_LIST_HEAD(&disp->dma_queue);
+
+	/* initialize queue */
+	q = &disp->buffer_queue;
+	q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+	q->io_modes = VB2_MMAP;
+	q->drv_priv = disp;
+	q->buf_struct_size = sizeof(struct bfin_disp_buffer);
+	q->ops = &bfin_disp_video_qops;
+	q->mem_ops = &vb2_dma_contig_memops;
+	/* provide a mutex to vb2 queue */
+	q->lock = &disp->qlock;
+
+	ret = vb2_queue_init(q);
+	if (ret) {
+		v4l2_err(&disp->v4l2_dev,
+				"Unable to init videobuf2 queue\n");
+		goto err_free_handler;
+	}
+
+	/* initialize field of video device */
+	vfd = &disp->video_dev;
+	vfd->release    = video_device_release_empty;
+	vfd->fops       = &bfin_disp_fops;
+	vfd->ioctl_ops  = &bfin_disp_ioctl_ops;
+	vfd->tvnorms    = V4L2_STD_UNKNOWN;
+	vfd->v4l2_dev   = &disp->v4l2_dev;
+	vfd->vfl_dir    = VFL_DIR_TX;
+	vfd->queue      = q;
+	set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
+	strncpy(vfd->name, DISPLAY_DRV_NAME, sizeof(vfd->name));
+	/* provide a mutex to v4l2 core */
+	vfd->lock = &disp->mutex;
+
+	/* load up the subdevice */
+	i2c_adap = i2c_get_adapter(config->i2c_adapter_id);
+	if (!i2c_adap) {
+		v4l2_err(&disp->v4l2_dev,
+				"Unable to find i2c adapter\n");
+		goto err_free_handler;
+
+	}
+	disp->sd = v4l2_i2c_new_subdev_board(&disp->v4l2_dev,
+			i2c_adap, &config->board_info, NULL);
+	if (!disp->sd) {
+		v4l2_err(&disp->v4l2_dev,
+				"Unable to register sub device\n");
+		goto err_put_adap;
+	}
+
+	/*
+	 * explicitly set output, otherwise some boards
+	 * may not work at the state as we expected
+	 */
+	route = &config->routes[0];
+	ret = v4l2_subdev_call(disp->sd, video, s_routing,
+				route->output, route->output, 0);
+	if ((ret < 0) && (ret != -ENOIOCTLCMD)) {
+		v4l2_err(&disp->v4l2_dev, "Unable to set output\n");
+		goto err_unreg_sd;
+	}
+	disp->cur_output = 0;
+	/* update tvnorms from the subdevice */
+	vfd->tvnorms = config->outputs[0].std;
+	/* if this route has specific config, update ppi control */
+	if (route->ppi_control)
+		config->ppi_control = route->ppi_control;
+
+	/* now we can probe the default state */
+	if (config->outputs[0].capabilities & V4L2_IN_CAP_STD) {
+		v4l2_std_id std;
+		ret = v4l2_subdev_call(disp->sd, core, g_std, &std);
+		if (ret) {
+			v4l2_err(&disp->v4l2_dev,
+					"Unable to get std\n");
+			goto err_unreg_sd;
+		}
+		disp->std = std;
+	}
+	if (config->outputs[0].capabilities & V4L2_IN_CAP_DV_TIMINGS) {
+		struct v4l2_dv_timings dv_timings;
+		ret = v4l2_subdev_call(disp->sd, video,
+				g_dv_timings, &dv_timings);
+		if (ret) {
+			v4l2_err(&disp->v4l2_dev,
+					"Unable to get dv timings\n");
+			goto err_unreg_sd;
+		}
+		disp->dv_timings = dv_timings;
+	}
+	ret = bfin_disp_init_encoder_formats(disp);
+	if (ret) {
+		v4l2_err(&disp->v4l2_dev,
+				"Unable to create encoder formats table\n");
+		goto err_unreg_sd;
+	}
+
+	/* register video device */
+	ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
+	if (ret) {
+		v4l2_err(&disp->v4l2_dev,
+				"Unable to register video device\n");
+		goto err_free_ef;
+	}
+	video_set_drvdata(vfd, disp);
+	v4l2_info(&disp->v4l2_dev, "video device registered as: %s\n",
+			video_device_node_name(vfd));
+
+	return 0;
+err_free_ef:
+	bfin_disp_free_encoder_formats(disp);
+err_unreg_sd:
+	v4l2_device_unregister_subdev(disp->sd);
+	i2c_unregister_device(v4l2_get_subdevdata(disp->sd));
+err_put_adap:
+	i2c_put_adapter(i2c_adap);
+err_free_handler:
+	v4l2_ctrl_handler_free(&disp->ctrl_handler);
+err_unreg_v4l2:
+	v4l2_device_unregister(&disp->v4l2_dev);
+err_cleanup_ctx:
+	vb2_dma_contig_cleanup_ctx(disp->alloc_ctx);
+err_free_ppi:
+	ppi_delete_instance(disp->ppi);
+err_free_dev:
+	kfree(disp);
+	return ret;
+}
+
+static int bfin_disp_remove(struct platform_device *pdev)
+{
+	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
+	struct bfin_disp_device *disp = container_of(v4l2_dev,
+					struct bfin_disp_device, v4l2_dev);
+	struct i2c_client *client = v4l2_get_subdevdata(disp->sd);
+
+	video_unregister_device(&disp->video_dev);
+	bfin_disp_free_encoder_formats(disp);
+	v4l2_device_unregister_subdev(disp->sd);
+	i2c_unregister_device(client);
+	i2c_put_adapter(client->adapter);
+	v4l2_ctrl_handler_free(&disp->ctrl_handler);
+	v4l2_device_unregister(v4l2_dev);
+	vb2_dma_contig_cleanup_ctx(disp->alloc_ctx);
+	ppi_delete_instance(disp->ppi);
+	kfree(disp);
+	return 0;
+}
+
+static struct platform_driver bfin_disp_driver = {
+	.driver = {
+		.name  = DISPLAY_DRV_NAME,
+		.owner = THIS_MODULE,
+	},
+	.probe = bfin_disp_probe,
+	.remove = bfin_disp_remove,
+};
+module_platform_driver(bfin_disp_driver);
+
+MODULE_DESCRIPTION("Analog Devices blackfin video display driver");
+MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/media/blackfin/bfin_display.h b/include/media/blackfin/bfin_display.h
new file mode 100644
index 0000000..6eb1d5a
--- /dev/null
+++ b/include/media/blackfin/bfin_display.h
@@ -0,0 +1,38 @@
+#ifndef _BFIN_DISPLAY_H_
+#define _BFIN_DISPLAY_H_
+
+#include <linux/i2c.h>
+
+struct v4l2_output;
+struct ppi_info;
+
+struct disp_route {
+	u32 output;
+	u32 config;
+	u32 ppi_control;
+};
+
+struct bfin_display_config {
+	/* card name */
+	char *card_name;
+	/* outputs available at the sub device */
+	struct v4l2_output *outputs;
+	/* number of outputs supported */
+	int num_outputs;
+	/* routing information for each output */
+	struct disp_route *routes;
+	/* i2c bus adapter no */
+	int i2c_adapter_id;
+	/* i2c subdevice board info */
+	struct i2c_board_info board_info;
+	/* ppi board info */
+	const struct ppi_info *ppi_info;
+	/* ppi control */
+	u32 ppi_control;
+	/* ppi interrupt mask */
+	u32 int_mask;
+	/* horizontal blanking pixels */
+	int blank_pixels;
+};
+
+#endif
-- 
1.7.0.4