diff options
Diffstat (limited to 'drivers/gpu/drm/meson/meson_canvas.c')
| -rw-r--r-- | drivers/gpu/drm/meson/meson_canvas.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/gpu/drm/meson/meson_canvas.c b/drivers/gpu/drm/meson/meson_canvas.c new file mode 100644 index 000000000000..4109e36c297f --- /dev/null +++ b/drivers/gpu/drm/meson/meson_canvas.c @@ -0,0 +1,68 @@ +/* + * Copyright (C) 2016 BayLibre, SAS + * Author: Neil Armstrong <narmstrong@baylibre.com> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. + * Copyright (C) 2014 Endless Mobile + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include "meson_drv.h" +#include "meson_canvas.h" +#include "meson_registers.h" + +/* + * CANVAS is a memory zone where physical memory frames information + * are stored for the VIU to scanout. + */ + +/* DMC Registers */ +#define DMC_CAV_LUT_DATAL 0x48 /* 0x12 offset in data sheet */ +#define CANVAS_WIDTH_LBIT 29 +#define CANVAS_WIDTH_LWID 3 +#define DMC_CAV_LUT_DATAH 0x4c /* 0x13 offset in data sheet */ +#define CANVAS_WIDTH_HBIT 0 +#define CANVAS_HEIGHT_BIT 9 +#define CANVAS_BLKMODE_BIT 24 +#define DMC_CAV_LUT_ADDR 0x50 /* 0x14 offset in data sheet */ +#define CANVAS_LUT_WR_EN (0x2 << 8) +#define CANVAS_LUT_RD_EN (0x1 << 8) + +void meson_canvas_setup(struct meson_drm *priv, + uint32_t canvas_index, uint32_t addr, + uint32_t stride, uint32_t height, + unsigned int wrap, + unsigned int blkmode) +{ + unsigned int val; + + regmap_write(priv->dmc, DMC_CAV_LUT_DATAL, + (((addr + 7) >> 3)) | + (((stride + 7) >> 3) << CANVAS_WIDTH_LBIT)); + + regmap_write(priv->dmc, DMC_CAV_LUT_DATAH, + ((((stride + 7) >> 3) >> CANVAS_WIDTH_LWID) << + CANVAS_WIDTH_HBIT) | + (height << CANVAS_HEIGHT_BIT) | + (wrap << 22) | + (blkmode << CANVAS_BLKMODE_BIT)); + + regmap_write(priv->dmc, DMC_CAV_LUT_ADDR, + CANVAS_LUT_WR_EN | canvas_index); + + /* Force a read-back to make sure everything is flushed. */ + regmap_read(priv->dmc, DMC_CAV_LUT_DATAH, &val); +} |