1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Color space converter library
4 *
5 * Copyright (c) 2013 Texas Instruments Inc.
6 *
7 * David Griego, <dagriego@biglakesoftware.com>
8 * Dale Farnsworth, <dale@farnsworth.org>
9 * Archit Taneja, <archit@ti.com>
10 */
11
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/videodev2.h>
18
19 #include "csc.h"
20
21 /*
22 * 16 coefficients in the order:
23 * a0, b0, c0, a1, b1, c1, a2, b2, c2, d0, d1, d2
24 * (we may need to pass non-default values from user space later on, we might
25 * need to make the coefficient struct more easy to populate)
26 */
27 struct colorspace_coeffs {
28 u16 sd[12];
29 u16 hd[12];
30 };
31
32 /* VIDEO_RANGE: limited range, GRAPHICS_RANGE: full range */
33 #define CSC_COEFFS_VIDEO_RANGE_Y2R 0
34 #define CSC_COEFFS_GRAPHICS_RANGE_Y2R 1
35 #define CSC_COEFFS_VIDEO_RANGE_R2Y 2
36 #define CSC_COEFFS_GRAPHICS_RANGE_R2Y 3
37
38 /* default colorspace coefficients */
39 static struct colorspace_coeffs colorspace_coeffs[4] = {
40 [CSC_COEFFS_VIDEO_RANGE_Y2R] = {
41 {
42 /* SDTV */
43 0x0400, 0x0000, 0x057D, 0x0400, 0x1EA7, 0x1D35,
44 0x0400, 0x06EF, 0x1FFE, 0x0D40, 0x0210, 0x0C88,
45 },
46 {
47 /* HDTV */
48 0x0400, 0x0000, 0x0629, 0x0400, 0x1F45, 0x1E2B,
49 0x0400, 0x0742, 0x0000, 0x0CEC, 0x0148, 0x0C60,
50 },
51 },
52 [CSC_COEFFS_GRAPHICS_RANGE_Y2R] = {
53 {
54 /* SDTV */
55 0x04A8, 0x1FFE, 0x0662, 0x04A8, 0x1E6F, 0x1CBF,
56 0x04A8, 0x0812, 0x1FFF, 0x0C84, 0x0220, 0x0BAC,
57 },
58 {
59 /* HDTV */
60 0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
61 0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
62 },
63 },
64 [CSC_COEFFS_VIDEO_RANGE_R2Y] = {
65 {
66 /* SDTV */
67 0x0132, 0x0259, 0x0075, 0x1F50, 0x1EA5, 0x020B,
68 0x020B, 0x1E4A, 0x1FAB, 0x0000, 0x0200, 0x0200,
69 },
70 {
71 /* HDTV */
72 0x00DA, 0x02DC, 0x004A, 0x1F88, 0x1E6C, 0x020C,
73 0x020C, 0x1E24, 0x1FD0, 0x0000, 0x0200, 0x0200,
74 },
75 },
76 [CSC_COEFFS_GRAPHICS_RANGE_R2Y] = {
77 {
78 /* SDTV */
79 0x0107, 0x0204, 0x0064, 0x1F68, 0x1ED6, 0x01C2,
80 0x01C2, 0x1E87, 0x1FB7, 0x0040, 0x0200, 0x0200,
81 },
82 {
83 /* HDTV */
84 0x04A8, 0x0000, 0x072C, 0x04A8, 0x1F26, 0x1DDE,
85 0x04A8, 0x0873, 0x0000, 0x0C20, 0x0134, 0x0B7C,
86 },
87 },
88 };
89
csc_dump_regs(struct csc_data * csc)90 void csc_dump_regs(struct csc_data *csc)
91 {
92 struct device *dev = &csc->pdev->dev;
93
94 #define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
95 ioread32(csc->base + CSC_##r))
96
97 dev_dbg(dev, "CSC Registers @ %pa:\n", &csc->res->start);
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 EXPORT_SYMBOL(csc_dump_regs);
109
csc_set_coeff_bypass(struct csc_data * csc,u32 * csc_reg5)110 void csc_set_coeff_bypass(struct csc_data *csc, u32 *csc_reg5)
111 {
112 *csc_reg5 |= CSC_BYPASS;
113 }
114 EXPORT_SYMBOL(csc_set_coeff_bypass);
115
116 /*
117 * set the color space converter coefficient shadow register values
118 */
csc_set_coeff(struct csc_data * csc,u32 * csc_reg0,enum v4l2_colorspace src_colorspace,enum v4l2_colorspace dst_colorspace)119 void csc_set_coeff(struct csc_data *csc, u32 *csc_reg0,
120 enum v4l2_colorspace src_colorspace,
121 enum v4l2_colorspace dst_colorspace)
122 {
123 u32 *csc_reg5 = csc_reg0 + 5;
124 u32 *shadow_csc = csc_reg0;
125 struct colorspace_coeffs *sd_hd_coeffs;
126 u16 *coeff, *end_coeff;
127 enum v4l2_colorspace yuv_colorspace;
128 int sel = 0;
129
130 /*
131 * support only graphics data range(full range) for now, a control ioctl
132 * would be nice here
133 */
134 /* Y2R */
135 if (dst_colorspace == V4L2_COLORSPACE_SRGB &&
136 (src_colorspace == V4L2_COLORSPACE_SMPTE170M ||
137 src_colorspace == V4L2_COLORSPACE_REC709)) {
138 /* Y2R */
139 sel = 1;
140 yuv_colorspace = src_colorspace;
141 } else if ((dst_colorspace == V4L2_COLORSPACE_SMPTE170M ||
142 dst_colorspace == V4L2_COLORSPACE_REC709) &&
143 src_colorspace == V4L2_COLORSPACE_SRGB) {
144 /* R2Y */
145 sel = 3;
146 yuv_colorspace = dst_colorspace;
147 } else {
148 *csc_reg5 |= CSC_BYPASS;
149 return;
150 }
151
152 sd_hd_coeffs = &colorspace_coeffs[sel];
153
154 /* select between SD or HD coefficients */
155 if (yuv_colorspace == V4L2_COLORSPACE_SMPTE170M)
156 coeff = sd_hd_coeffs->sd;
157 else
158 coeff = sd_hd_coeffs->hd;
159
160 end_coeff = coeff + 12;
161
162 for (; coeff < end_coeff; coeff += 2)
163 *shadow_csc++ = (*(coeff + 1) << 16) | *coeff;
164 }
165 EXPORT_SYMBOL(csc_set_coeff);
166
csc_create(struct platform_device * pdev,const char * res_name)167 struct csc_data *csc_create(struct platform_device *pdev, const char *res_name)
168 {
169 struct csc_data *csc;
170
171 dev_dbg(&pdev->dev, "csc_create\n");
172
173 csc = devm_kzalloc(&pdev->dev, sizeof(*csc), GFP_KERNEL);
174 if (!csc) {
175 dev_err(&pdev->dev, "couldn't alloc csc_data\n");
176 return ERR_PTR(-ENOMEM);
177 }
178
179 csc->pdev = pdev;
180
181 csc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
182 res_name);
183 if (csc->res == NULL) {
184 dev_err(&pdev->dev, "missing '%s' platform resources data\n",
185 res_name);
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 ERR_CAST(csc->base);
193 }
194
195 return csc;
196 }
197 EXPORT_SYMBOL(csc_create);
198
199 MODULE_DESCRIPTION("TI VIP/VPE Color Space Converter");
200 MODULE_AUTHOR("Texas Instruments Inc.");
201 MODULE_LICENSE("GPL v2");
202
