71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
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/*
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* Copyright (C) 2016 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
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* Copyright (C) 2014 Endless Mobile
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "meson_drv.h"
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#include "meson_canvas.h"
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#include "meson_registers.h"
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/**
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* DOC: Canvas
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*
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* CANVAS is a memory zone where physical memory frames information
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* are stored for the VIU to scanout.
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*/
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/* DMC Registers */
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#define DMC_CAV_LUT_DATAL 0x48 /* 0x12 offset in data sheet */
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#define CANVAS_WIDTH_LBIT 29
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#define CANVAS_WIDTH_LWID 3
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#define DMC_CAV_LUT_DATAH 0x4c /* 0x13 offset in data sheet */
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#define CANVAS_WIDTH_HBIT 0
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#define CANVAS_HEIGHT_BIT 9
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#define CANVAS_BLKMODE_BIT 24
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#define DMC_CAV_LUT_ADDR 0x50 /* 0x14 offset in data sheet */
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#define CANVAS_LUT_WR_EN (0x2 << 8)
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#define CANVAS_LUT_RD_EN (0x1 << 8)
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void meson_canvas_setup(struct meson_drm *priv,
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uint32_t canvas_index, uint32_t addr,
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uint32_t stride, uint32_t height,
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unsigned int wrap,
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unsigned int blkmode)
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{
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unsigned int val;
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regmap_write(priv->dmc, DMC_CAV_LUT_DATAL,
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(((addr + 7) >> 3)) |
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(((stride + 7) >> 3) << CANVAS_WIDTH_LBIT));
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regmap_write(priv->dmc, DMC_CAV_LUT_DATAH,
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((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) <<
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CANVAS_WIDTH_HBIT) |
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(height << CANVAS_HEIGHT_BIT) |
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(wrap << 22) |
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(blkmode << CANVAS_BLKMODE_BIT));
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regmap_write(priv->dmc, DMC_CAV_LUT_ADDR,
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CANVAS_LUT_WR_EN | canvas_index);
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/* Force a read-back to make sure everything is flushed. */
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regmap_read(priv->dmc, DMC_CAV_LUT_DATAH, &val);
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}
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