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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* LCD driver for iPod Video
*
* Based on code from the ipodlinux project - http://ipodlinux.org/
* Adapted for Rockbox in December 2005
*
* Original file: linux/arch/armnommu/mach-ipod/fb.c
*
* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "lcd.h"
#include "kernel.h"
#include "system.h"
/*** hardware configuration ***/
void lcd_set_contrast(int val)
{
/* TODO: Implement lcd_set_contrast() */
(void)val;
}
void lcd_set_invert_display(bool yesno)
{
/* TODO: Implement lcd_set_invert_display() */
(void)yesno;
}
/* turn the display upside down (call lcd_update() afterwards) */
void lcd_set_flip(bool yesno)
{
/* TODO: Implement lcd_set_flip() */
(void)yesno;
}
/* Rolls up the lcd display by the specified amount of lines.
* Lines that are rolled out over the top of the screen are
* rolled in from the bottom again. This is a hardware
* remapping only and all operations on the lcd are affected.
* ->
* @param int lines - The number of lines that are rolled.
* The value must be 0 <= pixels < LCD_HEIGHT. */
void lcd_roll(int lines)
{
/* TODO: Implement lcd_roll() */
lines &= LCD_HEIGHT-1;
}
/* LCD init */
void lcd_init_device(void)
{
/* iPodLinux doesn't appear have any LCD init code for the Video */
}
/*** update functions ***/
/* Performance function that works with an external buffer
note that by and bheight are in 4-pixel units! */
void lcd_blit(const fb_data* data, int x, int by, int width,
int bheight, int stride)
{
/* TODO: Implement lcd_blit() */
(void)data;
(void)x;
(void)by;
(void)width;
(void)bheight;
(void)stride;
}
static inline void lcd_bcm_write32(unsigned address, unsigned value)
{
/* write out destination address as two 16bit values */
outw(address, 0x30010000);
outw((address >> 16), 0x30010000);
/* wait for it to be write ready */
while ((inw(0x30030000) & 0x2) == 0);
/* write out the value low 16, high 16 */
outw(value, 0x30000000);
outw((value >> 16), 0x30000000);
}
static void lcd_bcm_setup_rect(unsigned cmd,
unsigned start_horiz,
unsigned start_vert,
unsigned max_horiz,
unsigned max_vert,
unsigned count)
{
lcd_bcm_write32(0x1F8, 0xFFFA0005);
lcd_bcm_write32(0xE0000, cmd);
lcd_bcm_write32(0xE0004, start_horiz);
lcd_bcm_write32(0xE0008, start_vert);
lcd_bcm_write32(0xE000C, max_horiz);
lcd_bcm_write32(0xE0010, max_vert);
lcd_bcm_write32(0xE0014, count);
lcd_bcm_write32(0xE0018, count);
lcd_bcm_write32(0xE001C, 0);
}
static unsigned lcd_bcm_read32(unsigned address) {
while ((inw(0x30020000) & 1) == 0);
/* write out destination address as two 16bit values */
outw(address, 0x30020000);
outw((address >> 16), 0x30020000);
/* wait for it to be read ready */
while ((inw(0x30030000) & 0x10) == 0);
/* read the value */
return inw(0x30000000) | inw(0x30000000) << 16;
}
static inline void lcd_bcm_finishup(void) {
unsigned data;
outw(0x31, 0x30030000);
lcd_bcm_read32(0x1FC);
do {
/* This function takes about 14ms to execute - so we yield() */
yield();
data = lcd_bcm_read32(0x1F8);
} while (data == 0xFFFA0005 || data == 0xFFFF);
lcd_bcm_read32(0x1FC);
}
/* Update a fraction of the display. */
void lcd_update_rect(int x, int y, int width, int height) ICODE_ATTR;
void lcd_update_rect(int x, int y, int width, int height)
{
int rect1,rect2,rect3,rect4;
int newx,newwidth;
int count;
int c, r;
unsigned short *src;
/* Ensure x and width are both even - so we can read 32-bit aligned
data from lcd_framebuffer */
newx=x&~1;
newwidth=width&~1;
if (newx+newwidth < x+width) { newwidth+=2; }
x=newx; width=newwidth;
/* calculate the drawing region */
rect1 = x; /* start horiz */
rect2 = y; /* start vert */
rect3 = (x + width) - 1; /* max horiz */
rect4 = (y + height) - 1; /* max vert */
/* setup the drawing region */
count=(width * height) << 1;
lcd_bcm_setup_rect(0x34, rect1, rect2, rect3, rect4, count);
src = (unsigned short*)&lcd_framebuffer[y][x];
/* write out destination address as two 16bit values */
outw((0xE0020 & 0xffff), 0x30010000);
outw((0xE0020 >> 16), 0x30010000);
/* wait for it to be write ready */
while ((inw(0x30030000) & 0x2) == 0);
for (r = 0; r < height; r++) {
/* for each column */
for (c = 0; c < width; c+=2) {
/* write out two pixels */
outw(*(src++), 0x30000000);
outw(*(src++), 0x30000000);
}
src += (LCD_WIDTH - width);
}
lcd_bcm_finishup();
}
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void)
{
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}
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