[media] v4l: Renesas R-Car VSP1 driver

The VSP1 is a video processing engine that includes a blender, scalers,
filters and statistics computation. Configurable data path routing logic
allows ordering the internal blocks in a flexible way.
Due to the configurable nature of the pipeline the driver implements the
media controller API and doesn't use the V4L2 mem-to-mem framework, even
though the device usually operates in memory to memory mode.
Only the read pixel formatters, up/down scalers, write pixel formatters
and LCDC interface are supported at this stage.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 238 insertions, 0 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_lif.c b/drivers/media/platform/vsp1/vsp1_lif.c
new file mode 100644
index 000000000000..74a32e69ef10
--- /dev/null
+++ b/drivers/media/platform/vsp1/vsp1_lif.c
@@ -0,0 +1,238 @@
+/*
+ * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
+ *
+ * Copyright (C) 2013 Renesas Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/gfp.h>
+
+#include <media/v4l2-subdev.h>
+
+#include "vsp1.h"
+#include "vsp1_lif.h"
+
+#define LIF_MIN_SIZE				2U
+#define LIF_MAX_SIZE				2048U
+
+/* -----------------------------------------------------------------------------
+ * Device Access
+ */
+
+static inline u32 vsp1_lif_read(struct vsp1_lif *lif, u32 reg)
+{
+	return vsp1_read(lif->entity.vsp1, reg);
+}
+
+static inline void vsp1_lif_write(struct vsp1_lif *lif, u32 reg, u32 data)
+{
+	vsp1_write(lif->entity.vsp1, reg, data);
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Core Operations
+ */
+
+static int lif_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+	const struct v4l2_mbus_framefmt *format;
+	struct vsp1_lif *lif = to_lif(subdev);
+	unsigned int hbth = 1300;
+	unsigned int obth = 400;
+	unsigned int lbth = 200;
+
+	if (!enable) {
+		vsp1_lif_write(lif, VI6_LIF_CTRL, 0);
+		return 0;
+	}
+
+	format = &lif->entity.formats[LIF_PAD_SOURCE];
+
+	obth = min(obth, (format->width + 1) / 2 * format->height - 4);
+
+	vsp1_lif_write(lif, VI6_LIF_CSBTH,
+			(hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
+			(lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
+
+	vsp1_lif_write(lif, VI6_LIF_CTRL,
+			(obth << VI6_LIF_CTRL_OBTH_SHIFT) |
+			(format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
+			VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Pad Operations
+ */
+
+static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
+			      struct v4l2_subdev_fh *fh,
+			      struct v4l2_subdev_mbus_code_enum *code)
+{
+	static const unsigned int codes[] = {
+		V4L2_MBUS_FMT_ARGB8888_1X32,
+		V4L2_MBUS_FMT_AYUV8_1X32,
+	};
+
+	if (code->pad == LIF_PAD_SINK) {
+		if (code->index >= ARRAY_SIZE(codes))
+			return -EINVAL;
+
+		code->code = codes[code->index];
+	} else {
+		struct v4l2_mbus_framefmt *format;
+
+		/* The LIF can't perform format conversion, the sink format is
+		 * always identical to the source format.
+		 */
+		if (code->index)
+			return -EINVAL;
+
+		format = v4l2_subdev_get_try_format(fh, LIF_PAD_SINK);
+		code->code = format->code;
+	}
+
+	return 0;
+}
+
+static int lif_enum_frame_size(struct v4l2_subdev *subdev,
+			       struct v4l2_subdev_fh *fh,
+			       struct v4l2_subdev_frame_size_enum *fse)
+{
+	struct v4l2_mbus_framefmt *format;
+
+	format = v4l2_subdev_get_try_format(fh, LIF_PAD_SINK);
+
+	if (fse->index || fse->code != format->code)
+		return -EINVAL;
+
+	if (fse->pad == LIF_PAD_SINK) {
+		fse->min_width = LIF_MIN_SIZE;
+		fse->max_width = LIF_MAX_SIZE;
+		fse->min_height = LIF_MIN_SIZE;
+		fse->max_height = LIF_MAX_SIZE;
+	} else {
+		fse->min_width = format->width;
+		fse->max_width = format->width;
+		fse->min_height = format->height;
+		fse->max_height = format->height;
+	}
+
+	return 0;
+}
+
+static int lif_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct vsp1_lif *lif = to_lif(subdev);
+
+	fmt->format = *vsp1_entity_get_pad_format(&lif->entity, fh, fmt->pad,
+						  fmt->which);
+
+	return 0;
+}
+
+static int lif_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
+			  struct v4l2_subdev_format *fmt)
+{
+	struct vsp1_lif *lif = to_lif(subdev);
+	struct v4l2_mbus_framefmt *format;
+
+	/* Default to YUV if the requested format is not supported. */
+	if (fmt->format.code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
+	    fmt->format.code != V4L2_MBUS_FMT_AYUV8_1X32)
+		fmt->format.code = V4L2_MBUS_FMT_AYUV8_1X32;
+
+	format = vsp1_entity_get_pad_format(&lif->entity, fh, fmt->pad,
+					    fmt->which);
+
+	if (fmt->pad == LIF_PAD_SOURCE) {
+		/* The LIF source format is always identical to its sink
+		 * format.
+		 */
+		fmt->format = *format;
+		return 0;
+	}
+
+	format->code = fmt->format.code;
+	format->width = clamp_t(unsigned int, fmt->format.width,
+				LIF_MIN_SIZE, LIF_MAX_SIZE);
+	format->height = clamp_t(unsigned int, fmt->format.height,
+				 LIF_MIN_SIZE, LIF_MAX_SIZE);
+	format->field = V4L2_FIELD_NONE;
+	format->colorspace = V4L2_COLORSPACE_SRGB;
+
+	fmt->format = *format;
+
+	/* Propagate the format to the source pad. */
+	format = vsp1_entity_get_pad_format(&lif->entity, fh, LIF_PAD_SOURCE,
+					    fmt->which);
+	*format = fmt->format;
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Operations
+ */
+
+static struct v4l2_subdev_video_ops lif_video_ops = {
+	.s_stream = lif_s_stream,
+};
+
+static struct v4l2_subdev_pad_ops lif_pad_ops = {
+	.enum_mbus_code = lif_enum_mbus_code,
+	.enum_frame_size = lif_enum_frame_size,
+	.get_fmt = lif_get_format,
+	.set_fmt = lif_set_format,
+};
+
+static struct v4l2_subdev_ops lif_ops = {
+	.video	= &lif_video_ops,
+	.pad    = &lif_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Initialization and Cleanup
+ */
+
+struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1)
+{
+	struct v4l2_subdev *subdev;
+	struct vsp1_lif *lif;
+	int ret;
+
+	lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
+	if (lif == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	lif->entity.type = VSP1_ENTITY_LIF;
+	lif->entity.id = VI6_DPR_NODE_LIF;
+
+	ret = vsp1_entity_init(vsp1, &lif->entity, 2);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	/* Initialize the V4L2 subdev. */
+	subdev = &lif->entity.subdev;
+	v4l2_subdev_init(subdev, &lif_ops);
+
+	subdev->entity.ops = &vsp1_media_ops;
+	subdev->internal_ops = &vsp1_subdev_internal_ops;
+	snprintf(subdev->name, sizeof(subdev->name), "%s lif",
+		 dev_name(vsp1->dev));
+	v4l2_set_subdevdata(subdev, lif);
+	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	vsp1_entity_init_formats(subdev, NULL);
+
+	return lif;
+}