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
csc_dump_regs(struct csc_data * csc)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
csc_set_coeff_bypass(struct csc_data * csc,u32 * csc_reg5)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 */
csc_set_coeff(struct csc_data * csc,u32 * csc_reg0,enum v4l2_colorspace src_colorspace,enum v4l2_colorspace dst_colorspace)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
csc_create(struct platform_device * pdev,const char * res_name)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");
205
