drivers/media/platform/ti-vpe/csc.c

   1 /*
   2  * Color space converter library
   3  *
   4  * Copyright (c) 2013 Texas Instruments Inc.
   5  *
   6  * David Griego, <dagriego@biglakesoftware.com>
   7  * Dale Farnsworth, <dale@farnsworth.org>
   8  * Archit Taneja, <archit@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/videodev2.h>
  21
  22 #include "csc.h"
  23
  24 /*
  25  * 16 coefficients in the order:
  26  * a0, b0, c0, a1, b1, c1, a2, b2, c2, d0, d1, d2
  27  * (we may need to pass non-default values from user space later on, we might
  28  * need to make the coefficient struct more easy to populate)
  29  */
  30 struct colorspace_coeffs {
  31         u16     sd[12];
  32         u16     hd[12];
  33 };
  34
  35 /* VIDEO_RANGE: limited range, GRAPHICS_RANGE: full range */
  36 #define CSC_COEFFS_VIDEO_RANGE_Y2R      0
  37 #define CSC_COEFFS_GRAPHICS_RANGE_Y2R   1
  38 #define CSC_COEFFS_VIDEO_RANGE_R2Y      2
  39 #define CSC_COEFFS_GRAPHICS_RANGE_R2Y   3
  40
  41 /* default colorspace coefficients */
  42 static struct colorspace_coeffs colorspace_coeffs[4] = {
  43         [CSC_COEFFS_VIDEO_RANGE_Y2R] = {
  44                 {
  45                         /* SDTV */
  46                         0x0400, 0x0000, 0x057D, 0x0400, 0x1EA7, 0x1D35,
  47                         0x0400, 0x06EF, 0x1FFE, 0x0D40, 0x0210, 0x0C88,
  48                 },
  49                 {
  50                         /* HDTV */
  51                         0x0400, 0x0000, 0x0629, 0x0400, 0x1F45, 0x1E2B,
  52                         0x0400, 0x0742, 0x0000, 0x0CEC, 0x0148, 0x0C60,
  53                 },
  54         },
  55         [CSC_COEFFS_GRAPHICS_RANGE_Y2R] = {
  56                 {
  57                         /* SDTV */
  58                         0x04A8, 0x1FFE, 0x0662, 0x04A8, 0x1E6F, 0x1CBF,
  59                         0x04A8, 0x0812, 0x1FFF, 0x0C84, 0x0220, 0x0BAC,
  60                 },
  61                 {
  62                         /* HDTV */
  63                         0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
  64                         0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
  65                 },
  66         },
  67         [CSC_COEFFS_VIDEO_RANGE_R2Y] = {
  68                 {
  69                         /* SDTV */
  70                         0x0132, 0x0259, 0x0075, 0x1F50, 0x1EA5, 0x020B,
  71                         0x020B, 0x1E4A, 0x1FAB, 0x0000, 0x0200, 0x0200,
  72                 },
  73                 {
  74                         /* HDTV */
  75                         0x00DA, 0x02DC, 0x004A, 0x1F88, 0x1E6C, 0x020C,
  76                         0x020C, 0x1E24, 0x1FD0, 0x0000, 0x0200, 0x0200,
  77                 },
  78         },
  79         [CSC_COEFFS_GRAPHICS_RANGE_R2Y] = {
  80                 {
  81                         /* SDTV */
  82                         0x0107, 0x0204, 0x0064, 0x1F68, 0x1ED6, 0x01C2,
  83                         0x01C2, 0x1E87, 0x1FB7, 0x0040, 0x0200, 0x0200,
  84                 },
  85                 {
  86                         /* HDTV */
  87                         0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
  88                         0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
  89                 },
  90         },
  91 };
  92
  93 void csc_dump_regs(struct csc_data *csc)
  94 {
  95         struct device *dev = &csc->pdev->dev;
  96
  97 #define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
  98         ioread32(csc->base + CSC_##r))
  99
 100         dev_dbg(dev, "CSC Registers @ %pa:\n", &csc->res->start);
 101
 102         DUMPREG(CSC00);
 103         DUMPREG(CSC01);
 104         DUMPREG(CSC02);
 105         DUMPREG(CSC03);
 106         DUMPREG(CSC04);
 107         DUMPREG(CSC05);
 108
 109 #undef DUMPREG
 110 }
 111 EXPORT_SYMBOL(csc_dump_regs);
 112
 113 void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5)
 114 {
 115         *csc_reg5 |= CSC_BYPASS;
 116 }
 117 EXPORT_SYMBOL(csc_set_coeff_bypass);
 118
 119 /*
 120  * set the color space converter coefficient shadow register values
 121  */
 122 void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0,
 123                 enum v4l2_colorspace src_colorspace,
 124                 enum v4l2_colorspace dst_colorspace)
 125 {
 126         u32 *csc_reg5 = csc_reg0 + 5;
 127         u32 *shadow_csc = csc_reg0;
 128         struct colorspace_coeffs *sd_hd_coeffs;
 129         u16 *coeff, *end_coeff;
 130         enum v4l2_colorspace yuv_colorspace;
 131         int sel = 0;
 132
 133         /*
 134          * support only graphics data range(full range) for now, a control ioctl
 135          * would be nice here
 136          */
 137         /* Y2R */
 138         if (dst_colorspace == V4L2_COLORSPACE_SRGB &&
 139                         (src_colorspace == V4L2_COLORSPACE_SMPTE170M ||
 140                         src_colorspace == V4L2_COLORSPACE_REC709)) {
 141                 /* Y2R */
 142                 sel = 1;
 143                 yuv_colorspace = src_colorspace;
 144         } else if ((dst_colorspace == V4L2_COLORSPACE_SMPTE170M ||
 145                         dst_colorspace == V4L2_COLORSPACE_REC709) &&
 146                         src_colorspace == V4L2_COLORSPACE_SRGB) {
 147                 /* R2Y */
 148                 sel = 3;
 149                 yuv_colorspace = dst_colorspace;
 150         } else {
 151                 *csc_reg5 |= CSC_BYPASS;
 152                 return;
 153         }
 154
 155         sd_hd_coeffs = &colorspace_coeffs[sel];
 156
 157         /* select between SD or HD coefficients */
 158         if (yuv_colorspace == V4L2_COLORSPACE_SMPTE170M)
 159                 coeff = sd_hd_coeffs->sd;
 160         else
 161                 coeff = sd_hd_coeffs->hd;
 162
 163         end_coeff = coeff + 12;
 164
 165         for (; coeff < end_coeff; coeff += 2)
 166                 *shadow_csc++ = (*(coeff + 1) << 16) | *coeff;
 167 }
 168 EXPORT_SYMBOL(csc_set_coeff);
 169
 170 struct csc_data *csc_create(struct platform_device *pdev, const char *res_name)
 171 {
 172         struct csc_data *csc;
 173
 174         dev_dbg(&pdev->dev, "csc_create\n");
 175
 176         csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL);
 177         if (!csc) {
 178                 dev_err(&pdev->dev, "couldn't alloc csc_data\n");
 179                 return ERR_PTR(-ENOMEM);
 180         }
 181
 182         csc->pdev = pdev;
 183
 184         csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 185                                                 res_name);
 186         if (csc->res == NULL) {
 187                 dev_err(&pdev->dev, "missing '%s' platform resources data\n",
 188                         res_name);
 189                 return ERR_PTR(-ENODEV);
 190         }
 191
 192         csc->base = devm_ioremap_resource(&pdev->dev, csc->res);
 193         if (IS_ERR(csc->base)) {
 194                 dev_err(&pdev->dev, "failed to ioremap\n");
 195                 return ERR_CAST(csc->base);
 196         }
 197
 198         return csc;
 199 }
 200 EXPORT_SYMBOL(csc_create);
 201
 202 MODULE_DESCRIPTION("TI VIP/VPE Color Space Converter");
 203 MODULE_AUTHOR("Texas Instruments Inc.");
 204 MODULE_LICENSE("GPL v2");