drivers/gpu/drm/meson/meson_canvas.c

   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
  46 void 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 }