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