- 根目录:
- drivers
- media
- platform
- xilinx
- xilinx-vip.c
/*
* 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);