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soc: amlogic: add meson-canvas driver

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Amlogic SoCs have a repository of 256 canvas which they use to
describe pixel buffers.

They contain metadata like width, height, block mode, endianness [..]

Many IPs within those SoCs like vdec/vpu rely on those canvas to read/write
pixels.

Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
This commit is contained in:
Maxime Jourdan 2018-08-23 13:49:53 +02:00 • committed by Kevin Hilman
parent 5516803d48
commit d4983983d9
4 changed files with 258 additions and 0 deletions
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65
include/linux/soc/amlogic/meson-canvas.h Normal file
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018 BayLibre, SAS
*/
#ifndef __SOC_MESON_CANVAS_H
#define __SOC_MESON_CANVAS_H
#include <linux/kernel.h>
#define MESON_CANVAS_WRAP_NONE 0x00
#define MESON_CANVAS_WRAP_X 0x01
#define MESON_CANVAS_WRAP_Y 0x02
#define MESON_CANVAS_BLKMODE_LINEAR 0x00
#define MESON_CANVAS_BLKMODE_32x32 0x01
#define MESON_CANVAS_BLKMODE_64x64 0x02
#define MESON_CANVAS_ENDIAN_SWAP16 0x1
#define MESON_CANVAS_ENDIAN_SWAP32 0x3
#define MESON_CANVAS_ENDIAN_SWAP64 0x7
#define MESON_CANVAS_ENDIAN_SWAP128 0xf
struct meson_canvas;
/**
* meson_canvas_get() - get a canvas provider instance
*
* @dev: consumer device pointer
*/
struct meson_canvas *meson_canvas_get(struct device *dev);
/**
* meson_canvas_alloc() - take ownership of a canvas
*
* @canvas: canvas provider instance retrieved from meson_canvas_get()
* @canvas_index: will be filled with the canvas ID
*/
int meson_canvas_alloc(struct meson_canvas *canvas, u8 *canvas_index);
/**
* meson_canvas_free() - remove ownership from a canvas
*
* @canvas: canvas provider instance retrieved from meson_canvas_get()
* @canvas_index: canvas ID that was obtained via meson_canvas_alloc()
*/
int meson_canvas_free(struct meson_canvas *canvas, u8 canvas_index);
/**
* meson_canvas_config() - configure a canvas
*
* @canvas: canvas provider instance retrieved from meson_canvas_get()
* @canvas_index: canvas ID that was obtained via meson_canvas_alloc()
* @addr: physical address to the pixel buffer
* @stride: width of the buffer
* @height: height of the buffer
* @wrap: undocumented
* @blkmode: block mode (linear, 32x32, 64x64)
* @endian: byte swapping (swap16, swap32, swap64, swap128)
*/
int meson_canvas_config(struct meson_canvas *canvas, u8 canvas_index,
u32 addr, u32 stride, u32 height,
unsigned int wrap, unsigned int blkmode,
unsigned int endian);
#endif