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 */ 29struct 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 */ 41static 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 92void csc_dump_regs(struct csc_data *csc) 93{ 94 struct device *dev = &csc->pdev->dev; 95 96 u32 read_reg(struct csc_data *csc, int offset) 97 { 98 return ioread32(csc->base + offset); 99 } 100 101#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, read_reg(csc, CSC_##r)) 102 103 DUMPREG(CSC00); 104 DUMPREG(CSC01); 105 DUMPREG(CSC02); 106 DUMPREG(CSC03); 107 DUMPREG(CSC04); 108 DUMPREG(CSC05); 109 110#undef DUMPREG 111} 112 113void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5) 114{ 115 *csc_reg5 |= CSC_BYPASS; 116} 117 118/* 119 * set the color space converter coefficient shadow register values 120 */ 121void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0, 122 enum v4l2_colorspace src_colorspace, 123 enum v4l2_colorspace dst_colorspace) 124{ 125 u32 *csc_reg5 = csc_reg0 + 5; 126 u32 *shadow_csc = csc_reg0; 127 struct colorspace_coeffs *sd_hd_coeffs; 128 u16 *coeff, *end_coeff; 129 enum v4l2_colorspace yuv_colorspace; 130 int sel = 0; 131 132 /* 133 * support only graphics data range(full range) for now, a control ioctl 134 * would be nice here 135 */ 136 /* Y2R */ 137 if (dst_colorspace == V4L2_COLORSPACE_SRGB && 138 (src_colorspace == V4L2_COLORSPACE_SMPTE170M || 139 src_colorspace == V4L2_COLORSPACE_REC709)) { 140 /* Y2R */ 141 sel = 1; 142 yuv_colorspace = src_colorspace; 143 } else if ((dst_colorspace == V4L2_COLORSPACE_SMPTE170M || 144 dst_colorspace == V4L2_COLORSPACE_REC709) && 145 src_colorspace == V4L2_COLORSPACE_SRGB) { 146 /* R2Y */ 147 sel = 3; 148 yuv_colorspace = dst_colorspace; 149 } else { 150 *csc_reg5 |= CSC_BYPASS; 151 return; 152 } 153 154 sd_hd_coeffs = &colorspace_coeffs[sel]; 155 156 /* select between SD or HD coefficients */ 157 if (yuv_colorspace == V4L2_COLORSPACE_SMPTE170M) 158 coeff = sd_hd_coeffs->sd; 159 else 160 coeff = sd_hd_coeffs->hd; 161 162 end_coeff = coeff + 12; 163 164 for (; coeff < end_coeff; coeff += 2) 165 *shadow_csc++ = (*(coeff + 1) << 16) | *coeff; 166} 167 168struct csc_data *csc_create(struct platform_device *pdev) 169{ 170 struct csc_data *csc; 171 172 dev_dbg(&pdev->dev, "csc_create\n"); 173 174 csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL); 175 if (!csc) { 176 dev_err(&pdev->dev, "couldn't alloc csc_data\n"); 177 return ERR_PTR(-ENOMEM); 178 } 179 180 csc->pdev = pdev; 181 182 csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 183 "csc"); 184 if (csc->res == NULL) { 185 dev_err(&pdev->dev, "missing platform resources data\n"); 186 return ERR_PTR(-ENODEV); 187 } 188 189 csc->base = devm_ioremap_resource(&pdev->dev, csc->res); 190 if (IS_ERR(csc->base)) { 191 dev_err(&pdev->dev, "failed to ioremap\n"); 192 return csc->base; 193 } 194 195 return csc; 196} 197