drivers/media/platform/xilinx/xilinx-vip.c - kernel/quantenna - Git at Google

 /*
  * Xilinx Video IP Core
  *
  * Copyright (C) 2013-2015 Ideas on Board
  * Copyright (C) 2013-2015 Xilinx, Inc.
  *
  * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
  *           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 version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/clk.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>

 #include <dt-bindings/media/xilinx-vip.h>

 #include "xilinx-vip.h"

 /* -----------------------------------------------------------------------------
  * Helper functions
  */

 static const struct xvip_video_format xvip_video_formats[] = {
 	{ XVIP_VF_YUV_422, 8, NULL, MEDIA_BUS_FMT_UYVY8_1X16,
 	  2, V4L2_PIX_FMT_YUYV, "4:2:2, packed, YUYV" },
 	{ XVIP_VF_YUV_444, 8, NULL, MEDIA_BUS_FMT_VUY8_1X24,
 	  3, V4L2_PIX_FMT_YUV444, "4:4:4, packed, YUYV" },
 	{ XVIP_VF_RBG, 8, NULL, MEDIA_BUS_FMT_RBG888_1X24,
 	  3, 0, NULL },
 	{ XVIP_VF_MONO_SENSOR, 8, "mono", MEDIA_BUS_FMT_Y8_1X8,
 	  1, V4L2_PIX_FMT_GREY, "Greyscale 8-bit" },
 	{ XVIP_VF_MONO_SENSOR, 8, "rggb", MEDIA_BUS_FMT_SRGGB8_1X8,
 	  1, V4L2_PIX_FMT_SGRBG8, "Bayer 8-bit RGGB" },
 	{ XVIP_VF_MONO_SENSOR, 8, "grbg", MEDIA_BUS_FMT_SGRBG8_1X8,
 	  1, V4L2_PIX_FMT_SGRBG8, "Bayer 8-bit GRBG" },
 	{ XVIP_VF_MONO_SENSOR, 8, "gbrg", MEDIA_BUS_FMT_SGBRG8_1X8,
 	  1, V4L2_PIX_FMT_SGBRG8, "Bayer 8-bit GBRG" },
 	{ XVIP_VF_MONO_SENSOR, 8, "bggr", MEDIA_BUS_FMT_SBGGR8_1X8,
 	  1, V4L2_PIX_FMT_SBGGR8, "Bayer 8-bit BGGR" },
 };

 /**
  * xvip_get_format_by_code - Retrieve format information for a media bus code
  * @code: the format media bus code
  *
  * Return: a pointer to the format information structure corresponding to the
  * given V4L2 media bus format @code, or ERR_PTR if no corresponding format can
  * be found.
  */
 const struct xvip_video_format *xvip_get_format_by_code(unsigned int code)
 {
 	unsigned int i;

 	for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
 		const struct xvip_video_format *format = &xvip_video_formats[i];

 		if (format->code == code)
 			return format;
 	}

 	return ERR_PTR(-EINVAL);
 }
 EXPORT_SYMBOL_GPL(xvip_get_format_by_code);

 /**
  * xvip_get_format_by_fourcc - Retrieve format information for a 4CC
  * @fourcc: the format 4CC
  *
  * Return: a pointer to the format information structure corresponding to the
  * given V4L2 format @fourcc, or ERR_PTR if no corresponding format can be
  * found.
  */
 const struct xvip_video_format *xvip_get_format_by_fourcc(u32 fourcc)
 {
 	unsigned int i;

 	for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
 		const struct xvip_video_format *format = &xvip_video_formats[i];

 		if (format->fourcc == fourcc)
 			return format;
 	}

 	return ERR_PTR(-EINVAL);
 }
 EXPORT_SYMBOL_GPL(xvip_get_format_by_fourcc);

 /**
  * xvip_of_get_format - Parse a device tree node and return format information
  * @node: the device tree node
  *
  * Read the xlnx,video-format, xlnx,video-width and xlnx,cfa-pattern properties
  * from the device tree @node passed as an argument and return the corresponding
  * format information.
  *
  * Return: a pointer to the format information structure corresponding to the
  * format name and width, or ERR_PTR if no corresponding format can be found.
  */
 const struct xvip_video_format *xvip_of_get_format(struct device_node *node)
 {
 	const char *pattern = "mono";
 	unsigned int vf_code;
 	unsigned int i;
 	u32 width;
 	int ret;

 	ret = of_property_read_u32(node, "xlnx,video-format", &vf_code);
 	if (ret < 0)
 		return ERR_PTR(ret);

 	ret = of_property_read_u32(node, "xlnx,video-width", &width);
 	if (ret < 0)
 		return ERR_PTR(ret);

 	if (vf_code == XVIP_VF_MONO_SENSOR)
 		of_property_read_string(node, "xlnx,cfa-pattern", &pattern);

 	for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
 		const struct xvip_video_format *format = &xvip_video_formats[i];

 		if (format->vf_code != vf_code || format->width != width)
 			continue;

 		if (vf_code == XVIP_VF_MONO_SENSOR &&
 		    strcmp(pattern, format->pattern))
 			continue;

 		return format;
 	}

 	return ERR_PTR(-EINVAL);
 }
 EXPORT_SYMBOL_GPL(xvip_of_get_format);

 /**
  * xvip_set_format_size - Set the media bus frame format size
  * @format: V4L2 frame format on media bus
  * @fmt: media bus format
  *
  * Set the media bus frame format size. The width / height from the subdevice
  * format are set to the given media bus format. The new format size is stored
  * in @format. The width and height are clamped using default min / max values.
  */
 void xvip_set_format_size(struct v4l2_mbus_framefmt *format,
 			  const struct v4l2_subdev_format *fmt)
 {
 	format->width = clamp_t(unsigned int, fmt->format.width,
 				XVIP_MIN_WIDTH, XVIP_MAX_WIDTH);
 	format->height = clamp_t(unsigned int, fmt->format.height,
 			 XVIP_MIN_HEIGHT, XVIP_MAX_HEIGHT);
 }
 EXPORT_SYMBOL_GPL(xvip_set_format_size);

 /**
  * xvip_clr_or_set - Clear or set the register with a bitmask
  * @xvip: Xilinx Video IP device
  * @addr: address of register
  * @mask: bitmask to be set or cleared
  * @set: boolean flag indicating whether to set or clear
  *
  * Clear or set the register at address @addr with a bitmask @mask depending on
  * the boolean flag @set. When the flag @set is true, the bitmask is set in
  * the register, otherwise the bitmask is cleared from the register
  * when the flag @set is false.
  *
  * Fox eample, this function can be used to set a control with a boolean value
  * requested by users. If the caller knows whether to set or clear in the first
  * place, the caller should call xvip_clr() or xvip_set() directly instead of
  * using this function.
  */
 void xvip_clr_or_set(struct xvip_device *xvip, u32 addr, u32 mask, bool set)
 {
 	u32 reg;

 	reg = xvip_read(xvip, addr);
 	reg = set ? reg | mask : reg & ~mask;
 	xvip_write(xvip, addr, reg);
 }
 EXPORT_SYMBOL_GPL(xvip_clr_or_set);

 /**
  * xvip_clr_and_set - Clear and set the register with a bitmask
  * @xvip: Xilinx Video IP device
  * @addr: address of register
  * @clr: bitmask to be cleared
  * @set: bitmask to be set
  *
  * Clear a bit(s) of mask @clr in the register at address @addr, then set
  * a bit(s) of mask @set in the register after.
  */
 void xvip_clr_and_set(struct xvip_device *xvip, u32 addr, u32 clr, u32 set)
 {
 	u32 reg;

 	reg = xvip_read(xvip, addr);
 	reg &= ~clr;
 	reg |= set;
 	xvip_write(xvip, addr, reg);
 }
 EXPORT_SYMBOL_GPL(xvip_clr_and_set);

 int xvip_init_resources(struct xvip_device *xvip)
 {
 	struct platform_device *pdev = to_platform_device(xvip->dev);
 	struct resource *res;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	xvip->iomem = devm_ioremap_resource(xvip->dev, res);
 	if (IS_ERR(xvip->iomem))
 		return PTR_ERR(xvip->iomem);

 	xvip->clk = devm_clk_get(xvip->dev, NULL);
 	if (IS_ERR(xvip->clk))
 		return PTR_ERR(xvip->clk);

 	clk_prepare_enable(xvip->clk);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(xvip_init_resources);

 void xvip_cleanup_resources(struct xvip_device *xvip)
 {
 	clk_disable_unprepare(xvip->clk);
 }
 EXPORT_SYMBOL_GPL(xvip_cleanup_resources);

 /* -----------------------------------------------------------------------------
  * Subdev operations handlers
  */

 /**
  * xvip_enum_mbus_code - Enumerate the media format code
  * @subdev: V4L2 subdevice
  * @cfg: V4L2 subdev pad configuration
  * @code: returning media bus code
  *
  * Enumerate the media bus code of the subdevice. Return the corresponding
  * pad format code. This function only works for subdevices with fixed format
  * on all pads. Subdevices with multiple format should have their own
  * function to enumerate mbus codes.
  *
  * Return: 0 if the media bus code is found, or -EINVAL if the format index
  * is not valid.
  */
 int xvip_enum_mbus_code(struct v4l2_subdev *subdev,
 			struct v4l2_subdev_pad_config *cfg,
 			struct v4l2_subdev_mbus_code_enum *code)
 {
 	struct v4l2_mbus_framefmt *format;

 	/* Enumerating frame sizes based on the active configuration isn't
 	 * supported yet.
 	 */
 	if (code->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 		return -EINVAL;

 	if (code->index)
 		return -EINVAL;

 	format = v4l2_subdev_get_try_format(subdev, cfg, code->pad);

 	code->code = format->code;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(xvip_enum_mbus_code);

 /**
  * xvip_enum_frame_size - Enumerate the media bus frame size
  * @subdev: V4L2 subdevice
  * @cfg: V4L2 subdev pad configuration
  * @fse: returning media bus frame size
  *
  * This function is a drop-in implementation of the subdev enum_frame_size pad
  * operation. It assumes that the subdevice has one sink pad and one source
  * pad, and that the format on the source pad is always identical to the
  * format on the sink pad. Entities with different requirements need to
  * implement their own enum_frame_size handlers.
  *
  * Return: 0 if the media bus frame size is found, or -EINVAL
  * if the index or the code is not valid.
  */
 int xvip_enum_frame_size(struct v4l2_subdev *subdev,
 			 struct v4l2_subdev_pad_config *cfg,
 			 struct v4l2_subdev_frame_size_enum *fse)
 {
 	struct v4l2_mbus_framefmt *format;

 	/* Enumerating frame sizes based on the active configuration isn't
 	 * supported yet.
 	 */
 	if (fse->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 		return -EINVAL;

 	format = v4l2_subdev_get_try_format(subdev, cfg, fse->pad);

 	if (fse->index || fse->code != format->code)
 		return -EINVAL;

 	if (fse->pad == XVIP_PAD_SINK) {
 		fse->min_width = XVIP_MIN_WIDTH;
 		fse->max_width = XVIP_MAX_WIDTH;
 		fse->min_height = XVIP_MIN_HEIGHT;
 		fse->max_height = XVIP_MAX_HEIGHT;
 	} else {
 		/* The size on the source pad is fixed and always identical to
 		 * the size on the sink pad.
 		 */
 		fse->min_width = format->width;
 		fse->max_width = format->width;
 		fse->min_height = format->height;
 		fse->max_height = format->height;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(xvip_enum_frame_size);
	/*
	* Xilinx Video IP Core
	*
	* Copyright (C) 2013-2015 Ideas on Board
	* Copyright (C) 2013-2015 Xilinx, Inc.
	*
	* Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
	* 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 version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/clk.h>
	#include <linux/export.h>
	#include <linux/kernel.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>

	#include <dt-bindings/media/xilinx-vip.h>

	#include "xilinx-vip.h"

	/* -----------------------------------------------------------------------------
	* Helper functions
	*/

	static const struct xvip_video_format xvip_video_formats[] = {
	{ XVIP_VF_YUV_422, 8, NULL, MEDIA_BUS_FMT_UYVY8_1X16,
	2, V4L2_PIX_FMT_YUYV, "4:2:2, packed, YUYV" },
	{ XVIP_VF_YUV_444, 8, NULL, MEDIA_BUS_FMT_VUY8_1X24,
	3, V4L2_PIX_FMT_YUV444, "4:4:4, packed, YUYV" },
	{ XVIP_VF_RBG, 8, NULL, MEDIA_BUS_FMT_RBG888_1X24,
	3, 0, NULL },
	{ XVIP_VF_MONO_SENSOR, 8, "mono", MEDIA_BUS_FMT_Y8_1X8,
	1, V4L2_PIX_FMT_GREY, "Greyscale 8-bit" },
	{ XVIP_VF_MONO_SENSOR, 8, "rggb", MEDIA_BUS_FMT_SRGGB8_1X8,
	1, V4L2_PIX_FMT_SGRBG8, "Bayer 8-bit RGGB" },
	{ XVIP_VF_MONO_SENSOR, 8, "grbg", MEDIA_BUS_FMT_SGRBG8_1X8,
	1, V4L2_PIX_FMT_SGRBG8, "Bayer 8-bit GRBG" },
	{ XVIP_VF_MONO_SENSOR, 8, "gbrg", MEDIA_BUS_FMT_SGBRG8_1X8,
	1, V4L2_PIX_FMT_SGBRG8, "Bayer 8-bit GBRG" },
	{ XVIP_VF_MONO_SENSOR, 8, "bggr", MEDIA_BUS_FMT_SBGGR8_1X8,
	1, V4L2_PIX_FMT_SBGGR8, "Bayer 8-bit BGGR" },
	};

	/**
	* xvip_get_format_by_code - Retrieve format information for a media bus code
	* @code: the format media bus code
	*
	* Return: a pointer to the format information structure corresponding to the
	* given V4L2 media bus format @code, or ERR_PTR if no corresponding format can
	* be found.
	*/
	const struct xvip_video_format *xvip_get_format_by_code(unsigned int code)
	{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
	const struct xvip_video_format *format = &xvip_video_formats[i];

	if (format->code == code)
	return format;
	}

	return ERR_PTR(-EINVAL);
	}
	EXPORT_SYMBOL_GPL(xvip_get_format_by_code);

	/**
	* xvip_get_format_by_fourcc - Retrieve format information for a 4CC
	* @fourcc: the format 4CC
	*
	* Return: a pointer to the format information structure corresponding to the
	* given V4L2 format @fourcc, or ERR_PTR if no corresponding format can be
	* found.
	*/
	const struct xvip_video_format *xvip_get_format_by_fourcc(u32 fourcc)
	{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
	const struct xvip_video_format *format = &xvip_video_formats[i];

	if (format->fourcc == fourcc)
	return format;
	}

	return ERR_PTR(-EINVAL);
	}
	EXPORT_SYMBOL_GPL(xvip_get_format_by_fourcc);

	/**
	* xvip_of_get_format - Parse a device tree node and return format information
	* @node: the device tree node
	*
	* Read the xlnx,video-format, xlnx,video-width and xlnx,cfa-pattern properties
	* from the device tree @node passed as an argument and return the corresponding
	* format information.
	*
	* Return: a pointer to the format information structure corresponding to the
	* format name and width, or ERR_PTR if no corresponding format can be found.
	*/
	const struct xvip_video_format xvip_of_get_format(struct device_node node)
	{
	const char *pattern = "mono";
	unsigned int vf_code;
	unsigned int i;
	u32 width;
	int ret;

	ret = of_property_read_u32(node, "xlnx,video-format", &vf_code);
	if (ret < 0)
	return ERR_PTR(ret);

	ret = of_property_read_u32(node, "xlnx,video-width", &width);
	if (ret < 0)
	return ERR_PTR(ret);

	if (vf_code == XVIP_VF_MONO_SENSOR)
	of_property_read_string(node, "xlnx,cfa-pattern", &pattern);

	for (i = 0; i < ARRAY_SIZE(xvip_video_formats); ++i) {
	const struct xvip_video_format *format = &xvip_video_formats[i];

	if (format->vf_code != vf_code \|\| format->width != width)
	continue;

	if (vf_code == XVIP_VF_MONO_SENSOR &&
	strcmp(pattern, format->pattern))
	continue;

	return format;
	}

	return ERR_PTR(-EINVAL);
	}
	EXPORT_SYMBOL_GPL(xvip_of_get_format);

	/**
	* xvip_set_format_size - Set the media bus frame format size
	* @format: V4L2 frame format on media bus
	* @fmt: media bus format
	*
	* Set the media bus frame format size. The width / height from the subdevice
	* format are set to the given media bus format. The new format size is stored
	* in @format. The width and height are clamped using default min / max values.
	*/
	void xvip_set_format_size(struct v4l2_mbus_framefmt *format,
	const struct v4l2_subdev_format *fmt)
	{
	format->width = clamp_t(unsigned int, fmt->format.width,
	XVIP_MIN_WIDTH, XVIP_MAX_WIDTH);
	format->height = clamp_t(unsigned int, fmt->format.height,
	XVIP_MIN_HEIGHT, XVIP_MAX_HEIGHT);
	}
	EXPORT_SYMBOL_GPL(xvip_set_format_size);

	/**
	* xvip_clr_or_set - Clear or set the register with a bitmask
	* @xvip: Xilinx Video IP device
	* @addr: address of register
	* @mask: bitmask to be set or cleared
	* @set: boolean flag indicating whether to set or clear
	*
	* Clear or set the register at address @addr with a bitmask @mask depending on
	* the boolean flag @set. When the flag @set is true, the bitmask is set in
	* the register, otherwise the bitmask is cleared from the register
	* when the flag @set is false.
	*
	* Fox eample, this function can be used to set a control with a boolean value
	* requested by users. If the caller knows whether to set or clear in the first
	* place, the caller should call xvip_clr() or xvip_set() directly instead of
	* using this function.
	*/
	void xvip_clr_or_set(struct xvip_device *xvip, u32 addr, u32 mask, bool set)
	{
	u32 reg;

	reg = xvip_read(xvip, addr);
	reg = set ? reg \| mask : reg & ~mask;
	xvip_write(xvip, addr, reg);
	}
	EXPORT_SYMBOL_GPL(xvip_clr_or_set);

	/**
	* xvip_clr_and_set - Clear and set the register with a bitmask
	* @xvip: Xilinx Video IP device
	* @addr: address of register
	* @clr: bitmask to be cleared
	* @set: bitmask to be set
	*
	* Clear a bit(s) of mask @clr in the register at address @addr, then set
	* a bit(s) of mask @set in the register after.
	*/
	void xvip_clr_and_set(struct xvip_device *xvip, u32 addr, u32 clr, u32 set)
	{
	u32 reg;

	reg = xvip_read(xvip, addr);
	reg &= ~clr;
	reg \|= set;
	xvip_write(xvip, addr, reg);
	}
	EXPORT_SYMBOL_GPL(xvip_clr_and_set);

	int xvip_init_resources(struct xvip_device *xvip)
	{
	struct platform_device *pdev = to_platform_device(xvip->dev);
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	xvip->iomem = devm_ioremap_resource(xvip->dev, res);
	if (IS_ERR(xvip->iomem))
	return PTR_ERR(xvip->iomem);

	xvip->clk = devm_clk_get(xvip->dev, NULL);
	if (IS_ERR(xvip->clk))
	return PTR_ERR(xvip->clk);

	clk_prepare_enable(xvip->clk);
	return 0;
	}
	EXPORT_SYMBOL_GPL(xvip_init_resources);

	void xvip_cleanup_resources(struct xvip_device *xvip)
	{
	clk_disable_unprepare(xvip->clk);
	}
	EXPORT_SYMBOL_GPL(xvip_cleanup_resources);

	/* -----------------------------------------------------------------------------
	* Subdev operations handlers
	*/

	/**
	* xvip_enum_mbus_code - Enumerate the media format code
	* @subdev: V4L2 subdevice
	* @cfg: V4L2 subdev pad configuration
	* @code: returning media bus code
	*
	* Enumerate the media bus code of the subdevice. Return the corresponding
	* pad format code. This function only works for subdevices with fixed format
	* on all pads. Subdevices with multiple format should have their own
	* function to enumerate mbus codes.
	*
	* Return: 0 if the media bus code is found, or -EINVAL if the format index
	* is not valid.
	*/
	int xvip_enum_mbus_code(struct v4l2_subdev *subdev,
	struct v4l2_subdev_pad_config *cfg,
	struct v4l2_subdev_mbus_code_enum *code)
	{
	struct v4l2_mbus_framefmt *format;

	/* Enumerating frame sizes based on the active configuration isn't
	* supported yet.
	*/
	if (code->which == V4L2_SUBDEV_FORMAT_ACTIVE)
	return -EINVAL;

	if (code->index)
	return -EINVAL;

	format = v4l2_subdev_get_try_format(subdev, cfg, code->pad);

	code->code = format->code;

	return 0;
	}
	EXPORT_SYMBOL_GPL(xvip_enum_mbus_code);

	/**
	* xvip_enum_frame_size - Enumerate the media bus frame size
	* @subdev: V4L2 subdevice
	* @cfg: V4L2 subdev pad configuration
	* @fse: returning media bus frame size
	*
	* This function is a drop-in implementation of the subdev enum_frame_size pad
	* operation. It assumes that the subdevice has one sink pad and one source
	* pad, and that the format on the source pad is always identical to the
	* format on the sink pad. Entities with different requirements need to
	* implement their own enum_frame_size handlers.
	*
	* Return: 0 if the media bus frame size is found, or -EINVAL
	* if the index or the code is not valid.
	*/
	int xvip_enum_frame_size(struct v4l2_subdev *subdev,
	struct v4l2_subdev_pad_config *cfg,
	struct v4l2_subdev_frame_size_enum *fse)
	{
	struct v4l2_mbus_framefmt *format;

	/* Enumerating frame sizes based on the active configuration isn't
	* supported yet.
	*/
	if (fse->which == V4L2_SUBDEV_FORMAT_ACTIVE)
	return -EINVAL;

	format = v4l2_subdev_get_try_format(subdev, cfg, fse->pad);

	if (fse->index \|\| fse->code != format->code)
	return -EINVAL;

	if (fse->pad == XVIP_PAD_SINK) {
	fse->min_width = XVIP_MIN_WIDTH;
	fse->max_width = XVIP_MAX_WIDTH;
	fse->min_height = XVIP_MIN_HEIGHT;
	fse->max_height = XVIP_MAX_HEIGHT;
	} else {
	/* The size on the source pad is fixed and always identical to
	* the size on the sink pad.
	*/
	fse->min_width = format->width;
	fse->max_width = format->width;
	fse->min_height = format->height;
	fse->max_height = format->height;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(xvip_enum_frame_size);