tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * DOC: Canvas
29 *
30 * CANVAS is a memory zone where physical memory frames information
31 * are stored for the VIU to scanout.
32 */
33
34/* DMC Registers */
35#define DMC_CAV_LUT_DATAL 0x48 /* 0x12 offset in data sheet */
36#define CANVAS_WIDTH_LBIT 29
37#define CANVAS_WIDTH_LWID 3
38#define DMC_CAV_LUT_DATAH 0x4c /* 0x13 offset in data sheet */
39#define CANVAS_WIDTH_HBIT 0
40#define CANVAS_HEIGHT_BIT 9
41#define CANVAS_BLKMODE_BIT 24
42#define DMC_CAV_LUT_ADDR 0x50 /* 0x14 offset in data sheet */
43#define CANVAS_LUT_WR_EN (0x2 << 8)
44#define CANVAS_LUT_RD_EN (0x1 << 8)
45
46void meson_canvas_setup(struct meson_drm *priv,
47 uint32_t canvas_index, uint32_t addr,
48 uint32_t stride, uint32_t height,
49 unsigned int wrap,
50 unsigned int blkmode)
51{
52 unsigned int val;
53
54 regmap_write(priv->dmc, DMC_CAV_LUT_DATAL,
55 (((addr + 7) >> 3)) |
56 (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
57
58 regmap_write(priv->dmc, DMC_CAV_LUT_DATAH,
59 ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
60 CANVAS_WIDTH_HBIT) |
61 (height << CANVAS_HEIGHT_BIT) |
62 (wrap << 22) |
63 (blkmode << CANVAS_BLKMODE_BIT));
64
65 regmap_write(priv->dmc, DMC_CAV_LUT_ADDR,
66 CANVAS_LUT_WR_EN | canvas_index);
67
68 /* Force a read-back to make sure everything is flushed. */
69 regmap_read(priv->dmc, DMC_CAV_LUT_DATAH, &val);
70}