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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Maurus Cuelenaere
*
* 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.
*
****************************************************************************/
#include "config.h"
#include "jz4740.h"
#include "lcd.h"
#include "lcd-target.h"
#include "system.h"
#include "kernel.h"
#include "backlight-target.h"
/*
Warning: code behaviour is unpredictable when threads get switched in IRQ mode!
So don't update the LCD in an interrupt handler!
*/
static volatile bool lcd_is_on = false;
static struct mutex lcd_mtx;
static struct wakeup lcd_wkup;
/* LCD init */
void lcd_init_device(void)
{
__cpm_start_lcd();
lcd_init_controller();
__cpm_stop_lcd();
lcd_is_on = true;
mutex_init(&lcd_mtx);
wakeup_init(&lcd_wkup);
system_enable_irq(DMA_IRQ(DMA_LCD_CHANNEL));
}
void lcd_enable(bool state)
{
if(state)
{
lcd_on();
lcd_call_enable_hook();
}
else
lcd_off();
lcd_is_on = state;
}
bool lcd_enabled(void)
{
return lcd_is_on;
}
/* Update a fraction of the display. */
void lcd_update_rect(int x, int y, int width, int height)
{
#if 1
/* This is an ugly HACK until partial LCD drawing works.. */
width = LCD_WIDTH;
height = LCD_HEIGHT;
x = 0;
y = 0;
#endif
mutex_lock(&lcd_mtx);
__cpm_start_lcd();
lcd_set_target(x, y, width, height);
dma_enable();
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) = DMAC_DCCSR_NDES;
REG_DMAC_DSAR(DMA_LCD_CHANNEL) = PHYSADDR((unsigned long)&lcd_framebuffer[y][x]);
REG_DMAC_DRSR(DMA_LCD_CHANNEL) = DMAC_DRSR_RS_SLCD; /* source = SLCD */
REG_DMAC_DTAR(DMA_LCD_CHANNEL) = PHYSADDR(SLCD_FIFO);
REG_DMAC_DTCR(DMA_LCD_CHANNEL) = width*height;
REG_DMAC_DCMD(DMA_LCD_CHANNEL) = ( DMAC_DCMD_SAI | DMAC_DCMD_RDIL_IGN | DMAC_DCMD_SWDH_32
| DMAC_DCMD_DWDH_16 | DMAC_DCMD_DS_16BIT );
__dcache_writeback_all(); /* Size of framebuffer is way bigger than cache size.
We need to find a way to make the framebuffer uncached, so this statement can get removed. */
while(REG_SLCD_STATE & SLCD_STATE_BUSY);
REG_SLCD_CTRL |= SLCD_CTRL_DMA_EN; /* Enable SLCD DMA support */
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) |= DMAC_DCCSR_EN; /* Enable DMA channel */
REG_DMAC_DCMD(DMA_LCD_CHANNEL) |= DMAC_DCMD_TIE; /* Enable DMA interrupt */
wakeup_wait(&lcd_wkup, TIMEOUT_BLOCK);
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) &= ~DMAC_DCCSR_EN; /* Disable DMA channel */
dma_disable();
while(REG_SLCD_STATE & SLCD_STATE_BUSY);
REG_SLCD_CTRL &= ~SLCD_CTRL_DMA_EN; /* Disable SLCD DMA support */
__cpm_stop_lcd();
mutex_unlock(&lcd_mtx);
}
void DMA_CALLBACK(DMA_LCD_CHANNEL)(void)
{
if (REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_HLT)
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) &= ~DMAC_DCCSR_HLT;
if (REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_AR)
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) &= ~DMAC_DCCSR_AR;
if (REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_CT)
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) &= ~DMAC_DCCSR_CT;
if (REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_TT)
REG_DMAC_DCCSR(DMA_LCD_CHANNEL) &= ~DMAC_DCCSR_TT;
wakeup_signal(&lcd_wkup);
}
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void)
{
if (!lcd_is_on || !backlight_enabled())
return;
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}
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