2 * Copyright (C) 2016 BayLibre, SAS
4 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
5 * Copyright (C) 2014 Endless Mobile
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.
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.
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/>.
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"
28 * CANVAS is a memory zone where physical memory frames information
29 * are stored for the VIU to scanout.
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)
44 void meson_canvas_setup(struct meson_drm *priv,
45 uint32_t canvas_index, uint32_t addr,
46 uint32_t stride, uint32_t height,
52 regmap_write(priv->dmc, DMC_CAV_LUT_DATAL,
54 (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
56 regmap_write(priv->dmc, DMC_CAV_LUT_DATAH,
57 ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
59 (height << CANVAS_HEIGHT_BIT) |
61 (blkmode << CANVAS_BLKMODE_BIT));
63 regmap_write(priv->dmc, DMC_CAV_LUT_ADDR,
64 CANVAS_LUT_WR_EN | canvas_index);
66 /* Force a read-back to make sure everything is flushed. */
67 regmap_read(priv->dmc, DMC_CAV_LUT_DATAH, &val);