120fb4f319
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15820 a1c6a512-1295-4272-9138-f99709370657
355 lines
10 KiB
C
355 lines
10 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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"
|
|
|
|
/* The BCM bus width is 16 bits. But since the low address bits aren't decoded
|
|
* by the chip (the 3 BCM address bits are mapped to address bits 16..18 of the
|
|
* PP5022), writing 32 bits (and even more, using 'stmia') at once works. */
|
|
#define BCM_DATA (*(volatile unsigned short*)(0x30000000))
|
|
#define BCM_DATA32 (*(volatile unsigned long *)(0x30000000))
|
|
#define BCM_WR_ADDR (*(volatile unsigned short*)(0x30010000))
|
|
#define BCM_WR_ADDR32 (*(volatile unsigned long *)(0x30010000))
|
|
#define BCM_RD_ADDR (*(volatile unsigned short*)(0x30020000))
|
|
#define BCM_RD_ADDR32 (*(volatile unsigned long *)(0x30020000))
|
|
#define BCM_CONTROL (*(volatile unsigned short*)(0x30030000))
|
|
|
|
#define BCM_ALT_DATA (*(volatile unsigned short*)(0x30040000))
|
|
#define BCM_ALT_DATA32 (*(volatile unsigned long *)(0x30040000))
|
|
#define BCM_ALT_WR_ADDR (*(volatile unsigned short*)(0x30050000))
|
|
#define BCM_ALT_WR_ADDR32 (*(volatile unsigned long *)(0x30050000))
|
|
#define BCM_ALT_RD_ADDR (*(volatile unsigned short*)(0x30060000))
|
|
#define BCM_ALT_RD_ADDR32 (*(volatile unsigned long *)(0x30060000))
|
|
#define BCM_ALT_CONTROL (*(volatile unsigned short*)(0x30070000))
|
|
|
|
#define BCM_FB_BASE 0xE0020 /* Address of internal BCM framebuffer */
|
|
|
|
/* Time until the BCM is considered stalled and will be re-kicked.
|
|
* Must be guaranteed to be >~ 20ms. */
|
|
#define BCM_UPDATE_TIMEOUT (HZ/20)
|
|
|
|
enum lcd_status {
|
|
LCD_IDLE,
|
|
LCD_INITIAL,
|
|
LCD_NEED_UPDATE,
|
|
LCD_UPDATING
|
|
};
|
|
|
|
struct {
|
|
long update_timeout;
|
|
enum lcd_status state;
|
|
bool blocked;
|
|
#if NUM_CORES > 1
|
|
struct corelock cl; /* inter-core sync */
|
|
#endif
|
|
} lcd_state IBSS_ATTR;
|
|
|
|
|
|
static inline void bcm_write_addr(unsigned address)
|
|
{
|
|
BCM_WR_ADDR32 = address; /* write destination address */
|
|
|
|
while (!(BCM_CONTROL & 0x2)); /* wait for it to be write ready */
|
|
}
|
|
|
|
static inline void bcm_write32(unsigned address, unsigned value)
|
|
{
|
|
|
|
bcm_write_addr(address); /* set destination address */
|
|
|
|
BCM_DATA32 = value; /* write value */
|
|
}
|
|
|
|
static inline unsigned bcm_read32(unsigned address)
|
|
{
|
|
while (!(BCM_RD_ADDR & 1));
|
|
|
|
BCM_RD_ADDR32 = address; /* write source address */
|
|
|
|
while (!(BCM_CONTROL & 0x10)); /* wait for it to be read ready */
|
|
|
|
return BCM_DATA32; /* read value */
|
|
}
|
|
|
|
static void bcm_setup_rect(unsigned x, unsigned y,
|
|
unsigned width, unsigned height)
|
|
{
|
|
bcm_write_addr(0xE0004);
|
|
BCM_DATA32 = x;
|
|
BCM_DATA32 = y;
|
|
BCM_DATA32 = x + width - 1;
|
|
BCM_DATA32 = y + height - 1;
|
|
}
|
|
|
|
#ifndef BOOTLOADER
|
|
static void lcd_tick(void)
|
|
{
|
|
/* No set_irq_level - already in interrupt context */
|
|
#if NUM_CORES > 1
|
|
corelock_lock(&lcd_state.cl);
|
|
#endif
|
|
|
|
if (!lcd_state.blocked && lcd_state.state >= LCD_NEED_UPDATE)
|
|
{
|
|
unsigned data = bcm_read32(0x1F8);
|
|
bool bcm_is_busy = (data == 0xFFFA0005 || data == 0xFFFF);
|
|
|
|
if (((lcd_state.state == LCD_NEED_UPDATE) && !bcm_is_busy)
|
|
/* Update requested and BCM is no longer busy. */
|
|
|| (TIME_AFTER(current_tick, lcd_state.update_timeout) && bcm_is_busy))
|
|
/* BCM still busy after timeout, i.e. stalled. */
|
|
{
|
|
bcm_write32(0x1F8, 0xFFFA0005); /* Kick off update */
|
|
BCM_CONTROL = 0x31;
|
|
lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
|
|
lcd_state.state = LCD_UPDATING;
|
|
}
|
|
else if ((lcd_state.state == LCD_UPDATING) && !bcm_is_busy)
|
|
{
|
|
/* Update finished properly and no new update pending. */
|
|
lcd_state.state = LCD_IDLE;
|
|
}
|
|
}
|
|
#if NUM_CORES > 1
|
|
corelock_unlock(&lcd_state.cl);
|
|
#endif
|
|
}
|
|
|
|
static inline void lcd_block_tick(void)
|
|
{
|
|
int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
|
|
|
|
#if NUM_CORES > 1
|
|
corelock_lock(&lcd_state.cl);
|
|
lcd_state.blocked = true;
|
|
corelock_unlock(&lcd_state.cl);
|
|
#else
|
|
lcd_state.blocked = true;
|
|
#endif
|
|
set_irq_level(oldlevel);
|
|
}
|
|
|
|
static void lcd_unblock_and_update(void)
|
|
{
|
|
unsigned data;
|
|
bool bcm_is_busy;
|
|
int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
|
|
|
|
#if NUM_CORES > 1
|
|
corelock_lock(&lcd_state.cl);
|
|
#endif
|
|
data = bcm_read32(0x1F8);
|
|
bcm_is_busy = (data == 0xFFFA0005 || data == 0xFFFF);
|
|
|
|
if (!bcm_is_busy || (lcd_state.state == LCD_INITIAL) ||
|
|
TIME_AFTER(current_tick, lcd_state.update_timeout))
|
|
{
|
|
bcm_write32(0x1F8, 0xFFFA0005); /* Kick off update */
|
|
BCM_CONTROL = 0x31;
|
|
lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
|
|
lcd_state.state = LCD_UPDATING;
|
|
}
|
|
else
|
|
{
|
|
lcd_state.state = LCD_NEED_UPDATE; /* Post update request */
|
|
}
|
|
lcd_state.blocked = false;
|
|
|
|
#if NUM_CORES > 1
|
|
corelock_unlock(&lcd_state.cl);
|
|
#endif
|
|
set_irq_level(oldlevel);
|
|
}
|
|
|
|
#else /* BOOTLOADER */
|
|
|
|
#define lcd_block_tick()
|
|
|
|
static void lcd_unblock_and_update(void)
|
|
{
|
|
unsigned data;
|
|
|
|
if (lcd_state.state != LCD_INITIAL)
|
|
{
|
|
data = bcm_read32(0x1F8);
|
|
while (data == 0xFFFA0005 || data == 0xFFFF)
|
|
{
|
|
yield();
|
|
data = bcm_read32(0x1F8);
|
|
}
|
|
}
|
|
bcm_write32(0x1F8, 0xFFFA0005); /* Kick off update */
|
|
BCM_CONTROL = 0x31;
|
|
lcd_state.state = LCD_IDLE;
|
|
}
|
|
#endif /* BOOTLOADER */
|
|
|
|
/*** 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;
|
|
}
|
|
|
|
/* LCD init */
|
|
void lcd_init_device(void)
|
|
{
|
|
bcm_setup_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
|
|
lcd_state.blocked = false;
|
|
lcd_state.state = LCD_INITIAL;
|
|
#ifndef BOOTLOADER
|
|
#if NUM_CORES > 1
|
|
corelock_init(&lcd_state.cl);
|
|
#endif
|
|
tick_add_task(&lcd_tick);
|
|
#endif /* !BOOTLOADER */
|
|
}
|
|
|
|
/*** 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;
|
|
}
|
|
|
|
/* Update a fraction of the display. */
|
|
void lcd_update_rect(int x, int y, int width, int height)
|
|
{
|
|
const fb_data *addr;
|
|
unsigned bcmaddr;
|
|
|
|
if (x + width >= LCD_WIDTH)
|
|
width = LCD_WIDTH - x;
|
|
if (y + height >= LCD_HEIGHT)
|
|
height = LCD_HEIGHT - y;
|
|
|
|
if ((width <= 0) || (height <= 0))
|
|
return; /* Nothing left to do. */
|
|
|
|
/* Ensure x and width are both even. The BCM doesn't like small unaligned
|
|
* writes and would just ignore them. */
|
|
width = (width + (x & 1) + 1) & ~1;
|
|
x &= ~1;
|
|
|
|
/* Prevent the tick from triggering BCM updates while we're writing. */
|
|
lcd_block_tick();
|
|
|
|
addr = &lcd_framebuffer[y][x];
|
|
bcmaddr = BCM_FB_BASE + (LCD_WIDTH*2) * y + (x << 1);
|
|
|
|
if (width == LCD_WIDTH)
|
|
{
|
|
bcm_write_addr(bcmaddr);
|
|
lcd_write_data(addr, width * height);
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
bcm_write_addr(bcmaddr);
|
|
bcmaddr += (LCD_WIDTH*2);
|
|
lcd_write_data(addr, width);
|
|
addr += LCD_WIDTH;
|
|
}
|
|
while (--height > 0);
|
|
}
|
|
lcd_unblock_and_update();
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* Line write helper function for lcd_yuv_blit. Writes two lines of yuv420. */
|
|
extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
|
|
unsigned bcmaddr,
|
|
int width,
|
|
int stride);
|
|
|
|
/* Performance function to blit a YUV bitmap directly to the LCD */
|
|
void lcd_yuv_blit(unsigned char * const src[3],
|
|
int src_x, int src_y, int stride,
|
|
int x, int y, int width, int height)
|
|
{
|
|
unsigned bcmaddr;
|
|
off_t z;
|
|
unsigned char const * yuv_src[3];
|
|
|
|
/* Sorry, but width and height must be >= 2 or else */
|
|
width &= ~1;
|
|
|
|
z = stride * src_y;
|
|
yuv_src[0] = src[0] + z + src_x;
|
|
yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1);
|
|
yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
|
|
|
|
/* Prevent the tick from triggering BCM updates while we're writing. */
|
|
lcd_block_tick();
|
|
|
|
bcmaddr = BCM_FB_BASE + (LCD_WIDTH*2) * y + (x << 1);
|
|
height >>= 1;
|
|
|
|
do
|
|
{
|
|
lcd_write_yuv420_lines(yuv_src, bcmaddr, width, stride);
|
|
bcmaddr += (LCD_WIDTH*4); /* Skip up two lines */
|
|
yuv_src[0] += stride << 1;
|
|
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
|
|
yuv_src[2] += stride >> 1;
|
|
}
|
|
while (--height > 0);
|
|
|
|
lcd_unblock_and_update();
|
|
}
|