path: root/drivers/gpu/drm/ast/ast_mode.c

/*
 * Copyright 2012 Red Hat Inc.
 * Parts based on xf86-video-ast
 * Copyright (c) 2005 ASPEED Technology Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors: Dave Airlie <airlied@redhat.com>
 */
#include <linux/export.h>
#include "drmP.h"
#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "ast_drv.h"

#include "ast_tables.h"

static struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev);
static void ast_i2c_destroy(struct ast_i2c_chan *i2c);
static int ast_cursor_set(struct drm_crtc *crtc,
			  struct drm_file *file_priv,
			  uint32_t handle,
			  uint32_t width,
			  uint32_t height);
static int ast_cursor_move(struct drm_crtc *crtc,
			   int x, int y);

static inline void ast_load_palette_index(struct ast_private *ast,
				     u8 index, u8 red, u8 green,
				     u8 blue)
{
	ast_io_write8(ast, AST_IO_DAC_INDEX_WRITE, index);
	ast_io_read8(ast, AST_IO_SEQ_PORT);
	ast_io_write8(ast, AST_IO_DAC_DATA, red);
	ast_io_read8(ast, AST_IO_SEQ_PORT);
	ast_io_write8(ast, AST_IO_DAC_DATA, green);
	ast_io_read8(ast, AST_IO_SEQ_PORT);
	ast_io_write8(ast, AST_IO_DAC_DATA, blue);
	ast_io_read8(ast, AST_IO_SEQ_PORT);
}

static void ast_crtc_load_lut(struct drm_crtc *crtc)
{
	struct ast_private *ast = crtc->dev->dev_private;
	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
	int i;

	if (!crtc->enabled)
		return;

	for (i = 0; i < 256; i++)
		ast_load_palette_index(ast, i, ast_crtc->lut_r[i],
				       ast_crtc->lut_g[i], ast_crtc->lut_b[i]);
}

static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mode *mode,
				    struct drm_display_mode *adjusted_mode,
				    struct ast_vbios_mode_info *vbios_mode)
{
	struct ast_private *ast = crtc->dev->dev_private;
	u32 refresh_rate_index = 0, mode_id, color_index, refresh_rate;
	u32 hborder, vborder;

	switch (crtc->fb->bits_per_pixel) {
	case 8:
		vbios_mode->std_table = &vbios_stdtable[VGAModeIndex];
		color_index = VGAModeIndex - 1;
		break;
	case 16:
		vbios_mode->std_table = &vbios_stdtable[HiCModeIndex];
		color_index = HiCModeIndex;
		break;
	case 24:
	case 32:
		vbios_mode->std_table = &vbios_stdtable[TrueCModeIndex];
		color_index = TrueCModeIndex;
		break;
	default:
		return false;
	}

	switch (crtc->mode.crtc_hdisplay) {
	case 640:
		vbios_mode->enh_table = &res_640x480[refresh_rate_index];