Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 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> |
Archit Taneja | 6c4f4cb | 2013-12-12 05:36:02 -0300 | [diff] [blame] | 19 | #include <linux/videodev2.h> |
Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 20 | |
| 21 | #include "csc.h" |
| 22 | |
Archit Taneja | 6c4f4cb | 2013-12-12 05:36:02 -0300 | [diff] [blame] | 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 | |
Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 92 | void 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 | |
| 113 | void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5) |
| 114 | { |
| 115 | *csc_reg5 |= CSC_BYPASS; |
| 116 | } |
| 117 | |
Archit Taneja | 6c4f4cb | 2013-12-12 05:36:02 -0300 | [diff] [blame] | 118 | /* |
| 119 | * set the color space converter coefficient shadow register values |
| 120 | */ |
| 121 | void 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 | |
Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 168 | struct 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, |
Archit Taneja | 536954f | 2014-03-13 08:44:10 -0300 | [diff] [blame] | 183 | "csc"); |
Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 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); |
Bartlomiej Zolnierkiewicz | 691903f | 2014-03-18 07:41:42 -0300 | [diff] [blame] | 190 | if (IS_ERR(csc->base)) { |
Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 191 | dev_err(&pdev->dev, "failed to ioremap\n"); |
Bartlomiej Zolnierkiewicz | 691903f | 2014-03-18 07:41:42 -0300 | [diff] [blame] | 192 | return csc->base; |
Archit Taneja | 6948082 | 2013-12-12 05:36:01 -0300 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | return csc; |
| 196 | } |