1/*
 2 * Copyright (C) Jernej Skrabec <jernej.skrabec@siol.net>
 3 *
 4 * This program is free software; you can redistribute it and/or
 5 * modify it under the terms of the GNU General Public License as
 6 * published by the Free Software Foundation; either version 2 of
 7 * the License, or (at your option) any later version.
 8 */
 9
10#include <drm/drmP.h>
11
12#include "sun8i_csc.h"
13#include "sun8i_mixer.h"
14
15static const u32 ccsc_base[2][2] = {
16	{CCSC00_OFFSET, CCSC01_OFFSET},
17	{CCSC10_OFFSET, CCSC11_OFFSET},
18};
19
20/*
21 * Factors are in two's complement format, 10 bits for fractinal part.
22 * First tree values in each line are multiplication factor and last
23 * value is constant, which is added at the end.
24 */
25static const u32 yuv2rgb[] = {
26	0x000004A8, 0x00000000, 0x00000662, 0xFFFC845A,
27	0x000004A8, 0xFFFFFE6F, 0xFFFFFCBF, 0x00021DF4,
28	0x000004A8, 0x00000813, 0x00000000, 0xFFFBAC4A,
29};
30
31static const u32 yvu2rgb[] = {
32	0x000004A8, 0x00000662, 0x00000000, 0xFFFC845A,
33	0x000004A8, 0xFFFFFCBF, 0xFFFFFE6F, 0x00021DF4,
34	0x000004A8, 0x00000000, 0x00000813, 0xFFFBAC4A,
35};
36
37static void sun8i_csc_set_coefficients(struct regmap *map, u32 base,
38				       enum sun8i_csc_mode mode)
39{
40	const u32 *table;
41	int i, data;
42
43	switch (mode) {
44	case SUN8I_CSC_MODE_YUV2RGB:
45		table = yuv2rgb;
46		break;
47	case SUN8I_CSC_MODE_YVU2RGB:
48		table = yvu2rgb;
49		break;
50	default:
51		DRM_WARN("Wrong CSC mode specified.\n");
52		return;
53	}
54
55	for (i = 0; i < 12; i++) {
56		data = table[i];
57		/* For some reason, 0x200 must be added to constant parts */
58		if (((i + 1) & 3) == 0)
59			data += 0x200;
60		regmap_write(map, SUN8I_CSC_COEFF(base, i), data);
61	}
62}
63
64static void sun8i_csc_enable(struct regmap *map, u32 base, bool enable)
65{
66	u32 val;
67
68	if (enable)
69		val = SUN8I_CSC_CTRL_EN;
70	else
71		val = 0;
72
73	regmap_update_bits(map, SUN8I_CSC_CTRL(base), SUN8I_CSC_CTRL_EN, val);
74}
75
76void sun8i_csc_set_ccsc_coefficients(struct sun8i_mixer *mixer, int layer,
77				     enum sun8i_csc_mode mode)
78{
79	u32 base;
80
81	base = ccsc_base[mixer->cfg->ccsc][layer];
82
83	sun8i_csc_set_coefficients(mixer->engine.regs, base, mode);
84}
85
86void sun8i_csc_enable_ccsc(struct sun8i_mixer *mixer, int layer, bool enable)
87{
88	u32 base;
89
90	base = ccsc_base[mixer->cfg->ccsc][layer];
91
92	sun8i_csc_enable(mixer->engine.regs, base, enable);
93}