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// SPDX-License-Identifier: GPL-2.0-only
/*
* Color space converter library
*
* Copyright (c) 2013 Texas Instruments Inc.
*
* David Griego, <dagriego@biglakesoftware.com>
* Dale Farnsworth, <dale@farnsworth.org>
* Archit Taneja, <archit@ti.com>
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include "csc.h"
/*
* 16 coefficients in the order:
* a0, b0, c0, a1, b1, c1, a2, b2, c2, d0, d1, d2
* (we may need to pass non-default values from user space later on, we might
* need to make the coefficient struct more easy to populate)
*/
struct colorspace_coeffs {
u16 sd[12];
u16 hd[12];
};
/* VIDEO_RANGE: limited range, GRAPHICS_RANGE: full range */
#define CSC_COEFFS_VIDEO_RANGE_Y2R 0
#define CSC_COEFFS_GRAPHICS_RANGE_Y2R 1
#define CSC_COEFFS_VIDEO_RANGE_R2Y 2
#define CSC_COEFFS_GRAPHICS_RANGE_R2Y 3
/* default colorspace coefficients */
static struct colorspace_coeffs colorspace_coeffs[4] = {
[CSC_COEFFS_VIDEO_RANGE_Y2R] = {
{
/* SDTV */
0x0400, 0x0000, 0x057D, 0x0400, 0x1EA7, 0x1D35,
0x0400, 0x06EF, 0x1FFE, 0x0D40, 0x0210, 0x0C88,
},
{
/* HDTV */
0x0400, 0x0000, 0x0629, 0x0400, 0x1F45, 0x1E2B,
0x0400, 0x0742, 0x0000, 0x0CEC, 0x0148, 0x0C60,
},
},
[CSC_COEFFS_GRAPHICS_RANGE_Y2R] = {
{
/* SDTV */
0x04A8, 0x1FFE, 0x0662, 0x04A8, 0x1E6F, 0x1CBF,
0x04A8, 0x0812, 0x1FFF, 0x0C84, 0x0220, 0x0BAC,
},
{
/* HDTV */
0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
},
},
[CSC_COEFFS_VIDEO_RANGE_R2Y] = {
{
/* SDTV */
0x0132, 0x0259, 0x0075, 0x1F50, 0x1EA5, 0x020B,
0x020B, 0x1E4A, 0x1FAB, 0x0000, 0x0200, 0x0200,
},
{
/* HDTV */
0x00DA, 0x02DC, 0x004A, 0x1F88, 0x1E6C, 0x020C,
0x020C, 0x1E24, 0x1FD0, 0x0000, 0x0200, 0x0200,
},
},
[CSC_COEFFS_GRAPHICS_RANGE_R2Y] = {
{
/* SDTV */
0x0107, 0x0204, 0x0064, 0x1F68, 0x1ED6, 0x01C2,
0x01C2, 0x1E87, 0x1FB7, 0x0040, 0x0200, 0x0200,
},
{
/* HDTV */
0x00bb, 0x0275, 0x003f, 0x1f99, 0x1ea5, 0x01c2,
0x01c2, 0x1e67, 0x1fd7, 0x0040, 0x0200, 0x0200,
},
},
};
void csc_dump_regs(struct csc_data *csc)
{
struct device *dev = &csc->pdev->dev;
#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
ioread32(csc->base + CSC_##r))
dev_dbg(dev, "CSC Registers @ %pa:\n", &csc->res->start);
DUMPREG(CSC00);
DUMPREG(CSC01);
DUMPREG(CSC02);
DUMPREG(CSC03);
DUMPREG(CSC04);
DUMPREG(CSC05);
#undef DUMPREG
}
EXPORT_SYMBOL(csc_dump_regs);
void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5)
{
*csc_reg5 |= CSC_BYPASS;
}
EXPORT_SYMBOL(csc_set_coeff_bypass);
/*
* set the color space converter coefficient shadow register values
*/
void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0,
enum v4l2_colorspace src_colorspace,
enum v4l2_colorspace dst_colorspace)
{
u32 *csc_reg5 = csc_reg0 + 5;
u32 *shadow_csc = csc_reg0;
struct colorspace_coeffs *sd_hd_coeffs;
u16 *coeff, *end_coeff;
enum v4l2_colorspace yuv_colorspace;
int sel = 0;
/*
* support only graphics data range(full range) for now, a control ioctl
* would be nice here
*/
/* Y2R */
if (dst_colorspace == V4L2_COLORSPACE_SRGB &&
(src_colorspace == V4L2_COLORSPACE_SMPTE170M ||
src_colorspace == V4L2_COLORSPACE_REC709)) {
/* Y2R */
sel = 1;
yuv_colorspace = src_colorspace;
} else if ((dst_colorspace == V4L2_COLORSPACE_SMPTE170M ||
dst_colorspace == V4L2_COLORSPACE_REC709) &&
src_colorspace == V4L2_COLORSPACE_SRGB) {
/* R2Y */
sel = 3;
yuv_colorspace = dst_colorspace;
} else {
*csc_reg5 |= CSC_BYPASS;
return;
}
sd_hd_coeffs = &colorspace_coeffs[sel];
/* select between SD or HD coefficients */
if (yuv_colorspace == V4L2_COLORSPACE_SMPTE170M)
coeff = sd_hd_coeffs->sd;
else
coeff = sd_hd_coeffs->hd;
end_coeff = coeff + 12;
for (; coeff < end_coeff; coeff += 2)
*shadow_csc++ = (*(coeff + 1) << 16) | *coeff;
}
EXPORT_SYMBOL(csc_set_coeff);
struct csc_data *csc_create(struct platform_device *pdev, const char *res_name)
{
struct csc_data *csc;
dev_dbg(&pdev->dev, "csc_create\n");
csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL);
if (!csc) {
dev_err(&pdev->dev, "couldn't alloc csc_data\n");
return ERR_PTR(-ENOMEM);
}
csc->pdev = pdev;
csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
res_name);
if (csc->res == NULL) {
dev_err(&pdev->dev, "missing '%s' platform resources data\n",
res_name);
return ERR_PTR(-ENODEV);
}
csc->base = devm_ioremap_resource(&pdev->dev, csc->res);
if (IS_ERR(csc->base)) {
dev_err(&pdev->dev, "failed to ioremap\n");
return ERR_CAST(csc->base);
}
return csc;
}
EXPORT_SYMBOL(csc_create);
MODULE_DESCRIPTION("TI VIP/VPE Color Space Converter");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_LICENSE("GPL v2");
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