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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef __LCD_X1000_H__
#define __LCD_X1000_H__
/* NOTICE: if adding LCD support for a new X1000 target, please take a look
* at the implementation in case there's any difficulties; there may be some
* parts that need adjusting. The X1000 LCD interface is poorly documented
* and it might be necessary to change some settings by trial and error to
* match the panel. */
#include "clk-x1000.h"
#include <stdbool.h>
#define LCD_INSTR_CMD 0
#define LCD_INSTR_DAT 1
#define LCD_INSTR_UDELAY 2
#define LCD_INSTR_END 3
struct lcd_tgt_config {
/* Data bus width, in bits */
unsigned bus_width: 8;
/* Command bus width, in bits */
unsigned cmd_width: 8;
/* 1 = use 6800 timings, 0 = use 8080 timings */
unsigned use_6800_mode: 1;
/* 1 = serial interface, 0 = parallel interface */
unsigned use_serial: 1;
/* Clock active edge: 0 = falling edge, 1 = rising edge */
unsigned clk_polarity: 1;
/* DC pin levels: 1 = data high, command low; 0 = data low, command high */
unsigned dc_polarity: 1;
/* WR pin level during idle: 1 = keep high; 0 = keep low */
unsigned wr_polarity: 1;
/* 1 to enable vsync, so DMA transfer is synchronized with TE signal */
unsigned te_enable: 1;
/* Active level of TE signal: 1 = high, 0 = low */
unsigned te_polarity: 1;
/* 1 = support narrow TE signal (<=3 pixel clocks); 0 = don't support */
unsigned te_narrow: 1;
/* 1 = big endian mode, 0 = little endian mode */
unsigned big_endian: 1;
/* Commands used to initiate a framebuffer write. Buffer must be
* aligned to 64-byte boundary and size must be a multiple of 4,
* regardless of the command bus width. */
const void* dma_wr_cmd_buf;
size_t dma_wr_cmd_size;
};
/* Static configuration for the target's LCD, must be defined by target. */
extern const struct lcd_tgt_config lcd_tgt_config;
/* Set the pixel clock. Valid clock sources are SCLK_A and MPLL. */
extern void lcd_set_clock(x1000_clk_t clksrc, uint32_t freq);
/* Execute a sequence of LCD commands. Should only be called from
* lcd_tgt_ctl_enable() and lcd_tgt_ctl_sleep().
*
* The array should be a list of pairs (instr, arg), with LCD_INSTR_END
* as the last entry.
*
* - LCD_INSTR_CMD, cmd: issue command write of 'cmd'
* - LCD_INSTR_DAT, dat: issue data write of 'dat'
* - LCD_INSTR_UDELAY, us: call udelay(us)
*/
extern void lcd_exec_commands(const uint32_t* cmdseq);
/* Enable/disable the LCD controller.
*
* - On enabling: power on the LCD, set the pixel clock with lcd_set_clock(),
* and use lcd_exec_commands() to send any needed initialization commands.
*
* - On disabling: use lcd_exec_commands() to send shutdown commands to the
* controller and disable the LCD power supply.
*/
extern void lcd_tgt_enable(bool on);
/* Enter or exit sleep mode to save power, normally by sending the necessary
* commands with lcd_exec_commands().
*/
extern void lcd_tgt_sleep(bool sleep);
#endif /* __LCD_X1000_H__ */
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