1/*
 2 * Copyright (C) 2016 BayLibre, SAS
 3 * Author: Neil Armstrong <narmstrong@baylibre.com>
 4 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
 5 * Copyright (C) 2014 Endless Mobile
 6 *
 7 * This program is free software; you can redistribute it and/or
 8 * modify it under the terms of the GNU General Public License as
 9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include "meson_drv.h"
24#include "meson_canvas.h"
25#include "meson_registers.h"
26
27/*
28 * CANVAS is a memory zone where physical memory frames information
29 * are stored for the VIU to scanout.
30 */
31
32/* DMC Registers */
33#define DMC_CAV_LUT_DATAL	0x48 /* 0x12 offset in data sheet */
34#define CANVAS_WIDTH_LBIT	29
35#define CANVAS_WIDTH_LWID       3
36#define DMC_CAV_LUT_DATAH	0x4c /* 0x13 offset in data sheet */
37#define CANVAS_WIDTH_HBIT       0
38#define CANVAS_HEIGHT_BIT       9
39#define CANVAS_BLKMODE_BIT      24
40#define DMC_CAV_LUT_ADDR	0x50 /* 0x14 offset in data sheet */
41#define CANVAS_LUT_WR_EN        (0x2 << 8)
42#define CANVAS_LUT_RD_EN        (0x1 << 8)
43
44void meson_canvas_setup(struct meson_drm *priv,
45			uint32_t canvas_index, uint32_t addr,
46			uint32_t stride, uint32_t height,
47			unsigned int wrap,
48			unsigned int blkmode)
49{
50	unsigned int val;
51
52	regmap_write(priv->dmc, DMC_CAV_LUT_DATAL,
53		(((addr + 7) >> 3)) |
54		(((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
55
56	regmap_write(priv->dmc, DMC_CAV_LUT_DATAH,
57		((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
58						CANVAS_WIDTH_HBIT) |
59		(height << CANVAS_HEIGHT_BIT) |
60		(wrap << 22) |
61		(blkmode << CANVAS_BLKMODE_BIT));
62
63	regmap_write(priv->dmc, DMC_CAV_LUT_ADDR,
64			CANVAS_LUT_WR_EN | canvas_index);
65
66	/* Force a read-back to make sure everything is flushed. */
67	regmap_read(priv->dmc, DMC_CAV_LUT_DATAH, &val);
68}