a119c44c7e
* Clean up codec & PCM + functional changes * LCD: Don't wait on DMAC in lcd_unlock() * SADC: add battery mutex + other changes * NAND: add mutex * USB rework (still not working) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19327 a1c6a512-1295-4272-9138-f99709370657
128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Maurus Cuelenaere
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "jz4740.h"
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#include "lcd.h"
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#include "lcd-target.h"
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#include "system.h"
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#include "kernel.h"
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static volatile bool lcd_is_on = false;
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static struct mutex lcd_mtx;
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/* LCD init */
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void lcd_init_device(void)
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{
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lcd_init_controller();
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lcd_is_on = true;
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mutex_init(&lcd_mtx);
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}
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void lcd_enable(bool state)
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{
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if(state)
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{
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lcd_on();
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lcd_call_enable_hook();
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}
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else
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lcd_off();
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lcd_is_on = state;
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}
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bool lcd_enabled(void)
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{
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return lcd_is_on;
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}
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/* Don't switch threads when in interrupt mode! */
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static inline void lcd_lock(void)
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{
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if(LIKELY(!in_interrupt_mode()))
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mutex_lock(&lcd_mtx);
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else
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while( !(REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_TT));
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}
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static inline void lcd_unlock(void)
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{
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if(LIKELY(!in_interrupt_mode()))
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mutex_unlock(&lcd_mtx);
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}
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static inline void lcd_wait(void)
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{
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if(LIKELY(!in_interrupt_mode()))
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{
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while( !(REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_TT) )
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yield();
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}
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else
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while( !(REG_DMAC_DCCSR(DMA_LCD_CHANNEL) & DMAC_DCCSR_TT));
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}
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/* Update a fraction of the display. */
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void lcd_update_rect(int x, int y, int width, int height)
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{
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lcd_lock();
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lcd_set_target(x, y, width, height);
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REG_DMAC_DCCSR(DMA_LCD_CHANNEL) = 0;
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REG_DMAC_DRSR(DMA_LCD_CHANNEL) = DMAC_DRSR_RS_SLCD; /* source = SLCD */
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REG_DMAC_DSAR(DMA_LCD_CHANNEL) = ((unsigned int)&lcd_framebuffer[y][x]) & 0x1FFFFFFF;
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REG_DMAC_DTAR(DMA_LCD_CHANNEL) = 0x130500B0; /* SLCD_FIFO */
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REG_DMAC_DTCR(DMA_LCD_CHANNEL) = width*height;
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REG_DMAC_DCMD(DMA_LCD_CHANNEL) = ( DMAC_DCMD_SAI | DMAC_DCMD_RDIL_IGN | DMAC_DCMD_SWDH_32
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| DMAC_DCMD_DWDH_16 | DMAC_DCMD_DS_16BIT );
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REG_DMAC_DCCSR(DMA_LCD_CHANNEL) = DMAC_DCCSR_NDES;
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__dcache_writeback_all(); /* Size of framebuffer is way bigger than cache size;
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we need to find a way to make the framebuffer uncached, so this statement can get removed. */
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while(REG_SLCD_STATE & SLCD_STATE_BUSY);
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REG_SLCD_CTRL |= SLCD_CTRL_DMA_EN;
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REG_DMAC_DCCSR(DMA_LCD_CHANNEL) |= DMAC_DCCSR_EN;
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lcd_wait();
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REG_DMAC_DCCSR(DMA_LCD_CHANNEL) &= ~DMAC_DCCSR_EN;
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while(REG_SLCD_STATE & SLCD_STATE_BUSY);
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REG_SLCD_CTRL &= ~SLCD_CTRL_DMA_EN;
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lcd_unlock();
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}
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/* Update the display.
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This must be called after all other LCD functions that change the display. */
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void lcd_update(void)
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{
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if (!lcd_is_on)
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return;
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lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
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}
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