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
csc_dump_regs(struct csc_data * csc)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
csc_set_coeff_bypass(struct csc_data * csc,u32 * csc_reg5)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 */
csc_set_coeff(struct csc_data * csc,u32 * csc_reg0,enum v4l2_colorspace src_colorspace,enum v4l2_colorspace dst_colorspace)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
csc_create(struct platform_device * pdev)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 }
193