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rockbox/firmware/target/arm/ipod/video/lcd-video.c
Boris Gjenero ab1e97aea8 Fix red 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20696 a1c6a512-1295-4272-9138-f99709370657
2009-04-12 15:35:57 +00:00

650 lines
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C
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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)
*
* 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 "cpu.h"
#include "lcd.h"
#include "kernel.h"
#include "system.h"
#ifdef HAVE_LCD_SLEEP
/* Included only for lcd_awake() prototype */
#include "backlight-target.h"
#endif
/* 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))
/* Time until the BCM is considered stalled and will be re-kicked.
* Must be guaranteed to be >~ 20ms. */
#define BCM_UPDATE_TIMEOUT (HZ/20)
/* An LCD update command done while the LCD is off needs >~ 200ms */
#define BCM_LCDINIT_TIMEOUT (HZ/2)
/* Addresses within BCM */
#define BCMA_SRAM_BASE 0
#define BCMA_COMMAND 0x1F8
#define BCMA_STATUS 0x1FC
#define BCMA_CMDPARAM 0xE0000 /* Parameters/data for commands */
#define BCMA_SDRAM_BASE 0xC0000000
#define BCMA_TV_FB 0xC0000000 /* TV out framebuffer */
#define BCMA_TV_BMPDATA 0xC0200000 /* BMP data for TV out functions */
/* BCM commands. Write them to BCMA_COMMAND. Note BCM_CMD encoding. */
#define BCM_CMD(x) ((~((unsigned long)x) << 16) | ((unsigned long)x))
#define BCMCMD_LCD_UPDATE BCM_CMD(0)
/* Execute "M25 Diagnostics". Status displayed on LCD. Takes <40s */
#define BCMCMD_SELFTEST BCM_CMD(1)
#define BCMCMD_TV_PALBMP BCM_CMD(2)
#define BCMCMD_TV_NTSCBMP BCM_CMD(3)
/* BCM_CMD(4) may be another TV-related command */
/* The following might do more depending on word at 0xE00000 */
#define BCMCMD_LCD_UPDATERECT BCM_CMD(5)
#define BCMCMD_LCD_SLEEP BCM_CMD(8)
/* BCM_CMD(12) involved in shutdown */
/* Macrovision analog copy prevention is on by default on TV output.
Execute this command after enabling TV out to turn it off.
*/
#define BCMCMD_TV_MVOFF BCM_CMD(14)
enum lcd_status {
LCD_IDLE,
LCD_INITIAL,
LCD_NEED_UPDATE,
LCD_UPDATING
};
struct {
long update_timeout; /* also used to ensure BCM stays off for >= 50 ms */
enum lcd_status state;
bool blocked;
#if NUM_CORES > 1
struct corelock cl; /* inter-core sync */
#endif
#ifdef HAVE_LCD_SLEEP
bool display_on;
bool waking;
struct wakeup initwakeup;
#endif
} lcd_state IBSS_ATTR;
#ifdef HAVE_LCD_SLEEP
const fb_data *flash_vmcs_offset;
unsigned flash_vmcs_length;
/* This mutex exists because enabling the backlight by changing a setting
will cause multiple concurrent lcd_wake() calls.
*/
static struct mutex lcdstate_lock SHAREDBSS_ATTR;
#define ROM_BASE 0x20000000
#define ROM_ID(a,b,c,d) (unsigned int)( ((unsigned int)(d)) | \
(((unsigned int)(c)) << 8) | \
(((unsigned int)(b)) << 16) | \
(((unsigned int)(a)) << 24) )
/* Get address and length of iPod flash section.
Based on part of FS#6721. This may belong elsewhere.
(BCM initialization uploads the vmcs section to the BCM.)
*/
bool flash_get_section(const unsigned int imageid,
void **offset,
unsigned int *length)
{
unsigned long *p = (unsigned long*)(ROM_BASE + 0xffe00);
unsigned char *csp, *csend;
unsigned long checksum;
/* Find the image in the directory */
while (1) {
if (p[0] != ROM_ID('f','l','s','h'))
return false;
if (p[1] == imageid)
break;
p += 10;
}
*offset = (void *)(ROM_BASE + p[3]);
*length = p[4];
/* Verify checksum. Probably unnecessary, but it's fast. */
checksum = 0;
csend = (unsigned char *)(ROM_BASE + p[3] + p[4]);
for(csp = (unsigned char *)(ROM_BASE + p[3]); csp < csend; csp++) {
checksum += *csp;
}
return checksum == p[7];
}
#endif /* HAVE_LCD_SLEEP */
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 */
}
#ifdef HAVE_LCD_SLEEP
static void continue_lcd_awake(void)
{
lcd_state.waking = false;
wakeup_signal(&(lcd_state.initwakeup));
}
#endif
#ifndef BOOTLOADER
static void lcd_tick(void)
{
/* No core level interrupt mask - 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(BCMA_COMMAND);
bool bcm_is_busy = (data == BCMCMD_LCD_UPDATE || 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(BCMA_COMMAND, BCMCMD_LCD_UPDATE); /* Kick off update */
BCM_CONTROL = 0x31;
lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
lcd_state.state = LCD_UPDATING;
#ifdef HAVE_LCD_SLEEP
if (lcd_state.waking)
continue_lcd_awake();
#endif
}
else if ((lcd_state.state == LCD_UPDATING) && !bcm_is_busy)
{
/* Update finished properly and no new update pending. */
lcd_state.state = LCD_IDLE;
#ifdef HAVE_LCD_SLEEP
if (lcd_state.waking)
continue_lcd_awake();
#endif
}
}
#if NUM_CORES > 1
corelock_unlock(&lcd_state.cl);
#endif
}
static inline void lcd_block_tick(void)
{
int oldlevel = disable_irq_save();
#if NUM_CORES > 1
corelock_lock(&lcd_state.cl);
lcd_state.blocked = true;
corelock_unlock(&lcd_state.cl);
#else
lcd_state.blocked = true;
#endif
restore_irq(oldlevel);
}
static void lcd_unblock_and_update(void)
{
unsigned data;
bool bcm_is_busy;
int oldlevel = disable_irq_save();
#if NUM_CORES > 1
corelock_lock(&lcd_state.cl);
#endif
data = bcm_read32(BCMA_COMMAND);
bcm_is_busy = (data == BCMCMD_LCD_UPDATE || data == 0xFFFF);
if (!bcm_is_busy || (lcd_state.state == LCD_INITIAL) ||
TIME_AFTER(current_tick, lcd_state.update_timeout))
{
bcm_write32(BCMA_COMMAND, BCMCMD_LCD_UPDATE); /* Kick off update */
BCM_CONTROL = 0x31;
lcd_state.update_timeout = current_tick + BCM_UPDATE_TIMEOUT;
lcd_state.state = LCD_UPDATING;
#ifdef HAVE_LCD_SLEEP
if (lcd_state.waking)
continue_lcd_awake();
#endif
}
else
{
lcd_state.state = LCD_NEED_UPDATE; /* Post update request */
}
lcd_state.blocked = false;
#if NUM_CORES > 1
corelock_unlock(&lcd_state.cl);
#endif
restore_irq(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(BCMA_COMMAND);
while (data == BCMCMD_LCD_UPDATE || data == 0xFFFF)
{
yield();
data = bcm_read32(BCMA_COMMAND);
}
}
bcm_write32(BCMA_COMMAND, BCMCMD_LCD_UPDATE); /* 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)
{
/* These port initializations are supposed to be done when initializing
the BCM. None of it is changed when shutting down the BCM.
*/
GPO32_ENABLE |= 0xC000;
GPIO_CLEAR_BITWISE(GPIOC_ENABLE, 0x80);
/* This pin is used for BCM interrupts */
GPIOC_ENABLE |= 0x40;
GPIOC_OUTPUT_EN &= ~0x40;
GPO32_ENABLE &= ~1;
lcd_state.blocked = false;
lcd_state.state = LCD_INITIAL;
#ifndef BOOTLOADER
#if NUM_CORES > 1
corelock_init(&lcd_state.cl);
#endif
#ifdef HAVE_LCD_SLEEP
if (!flash_get_section(ROM_ID('v', 'm', 'c', 's'),
(void **)(&flash_vmcs_offset), &flash_vmcs_length))
/* BCM cannot be shut down because firmware wasn't found */
flash_vmcs_length = 0;
else {
/* lcd_write_data needs an even number of 16 bit values */
flash_vmcs_length = ((flash_vmcs_length + 3) >> 1) & ~1;
}
mutex_init(&lcdstate_lock);
wakeup_init(&(lcd_state.initwakeup));
lcd_state.waking = false;
if (GPO32_VAL & 0x4000)
{
/* BCM is powered. Assume it is initialized. */
lcd_state.display_on = true;
tick_add_task(&lcd_tick);
}
else
{
/* BCM is not powered, so it needs to be initialized.
This can only happen when loading Rockbox via ROLO.
*/
lcd_state.update_timeout = current_tick;
lcd_state.display_on = false;
lcd_awake();
}
#else /* !HAVE_LCD_SLEEP */
tick_add_task(&lcd_tick);
#endif
#endif /* !BOOTLOADER */
}
/*** update functions ***/
/* Update a fraction of the display. */
void lcd_update_rect(int x, int y, int width, int height)
{
const fb_data *addr;
unsigned bcmaddr;
#ifdef HAVE_LCD_SLEEP
if (!lcd_state.display_on)
return;
#endif
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 = BCMA_CMDPARAM + (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_blit_yuv(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];
#ifdef HAVE_LCD_SLEEP
if (!lcd_state.display_on)
return;
#endif
/* 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 = BCMA_CMDPARAM + (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();
}
#ifdef HAVE_LCD_SLEEP
/* Executes a BCM command immediately and waits for it to complete.
Other BCM commands (eg. LCD updates or lcd_tick) must not interfere.
*/
static void bcm_command(unsigned cmd) {
unsigned status;
bcm_write32(BCMA_COMMAND, cmd);
BCM_CONTROL = 0x31;
while (1) {
status = bcm_read32(BCMA_COMMAND);
if (status != cmd && status != 0xFFFF)
break;
yield();
}
}
void bcm_powerdown(void)
{
bcm_write32(0x10001400, bcm_read32(0x10001400) & ~0xF0);
/* Blanks the LCD and decreases power consumption
below what clearing the LCD would achieve.
Executing an LCD update command wakes it.
*/
bcm_command(BCMCMD_LCD_SLEEP);
/* Not sure if this does anything */
bcm_command(BCM_CMD(0xC));
/* Further cuts power use, probably by powering down BCM.
After this point, BCM needs to be bootstrapped
*/
GPO32_VAL &= ~0x4000;
}
/* Data written to BCM_CONTROL and BCM_ALT_CONTROL */
const unsigned char bcm_bootstrapdata[] = {
0xA1, 0x81, 0x91, 0x02, 0x12, 0x22, 0x72, 0x62
};
void bcm_init(void)
{
int i;
/* Power up BCM */
GPO32_VAL |= 0x4000;
sleep(HZ/20);
/* Bootstrap stage 1 */
STRAP_OPT_A &= ~0xF00;
outl(0x1313, 0x70000040);
/* Interrupt-related code for future use
GPIOC_INT_LEV |= 0x40;
GPIOC_INT_EN |= 0x40;
CPU_HI_INT_EN |= 0x40000;
*/
/* Bootstrap stage 2 */
while (BCM_ALT_CONTROL & 0x80);
while (!(BCM_ALT_CONTROL & 0x40));
for (i = 0; i < 8; i++) {
BCM_CONTROL = bcm_bootstrapdata[i];
}
for (i = 3; i < 8; i++) {
BCM_ALT_CONTROL = bcm_bootstrapdata[i];
}
while ((BCM_RD_ADDR & 1) == 0 || (BCM_ALT_RD_ADDR & 1) == 0);
(void)BCM_WR_ADDR;
(void)BCM_ALT_WR_ADDR;
/* Bootstrap stage 3: upload firmware */
while (BCM_ALT_CONTROL & 0x80);
while (!(BCM_ALT_CONTROL & 0x40));
/* Upload firmware to BCM SRAM */
bcm_write_addr(BCMA_SRAM_BASE);
lcd_write_data(flash_vmcs_offset, flash_vmcs_length);
bcm_write32(BCMA_COMMAND, 0);
bcm_write32(0x10000C00, 0xC0000000);
while (!(bcm_read32(0x10000C00) & 1));
bcm_write32(0x10000C00, 0);
bcm_write32(0x10000400, 0xA5A50002);
while (bcm_read32(BCMA_COMMAND) == 0)
yield();
/* sleep(HZ/2) apparently unneeded */
}
void lcd_awake(void)
{
mutex_lock(&lcdstate_lock);
if (!lcd_state.display_on && flash_vmcs_length != 0)
{
/* Ensure BCM has been off for >= 50 ms */
long sleepwait = lcd_state.update_timeout + HZ/20 - current_tick;
if (sleepwait > 0 && sleepwait < HZ/20)
sleep(sleepwait);
bcm_init();
/* Start the first LCD update, which also initializes the LCD */
lcd_state.state = LCD_INITIAL;
lcd_state.display_on = true;
lcd_update();
lcd_state.update_timeout = current_tick + BCM_LCDINIT_TIMEOUT;
/* Wait for end of first LCD update, so LCD isn't white
when the backlight turns on.
*/
lcd_state.waking = true;
tick_add_task(&lcd_tick);
wakeup_wait(&(lcd_state.initwakeup), TIMEOUT_BLOCK);
lcd_activation_call_hook();
}
mutex_unlock(&lcdstate_lock);
}
void lcd_sleep(void)
{
mutex_lock(&lcdstate_lock);
if (lcd_state.display_on && flash_vmcs_length != 0) {
lcd_state.display_on = false;
/* Wait for BCM to finish work */
while (lcd_state.state != LCD_INITIAL && lcd_state.state != LCD_IDLE)
yield();
tick_remove_task(&lcd_tick);
bcm_powerdown();
/* Remember time to ensure BCM stays off for >= 50 ms */
lcd_state.update_timeout = current_tick;
}
mutex_unlock(&lcdstate_lock);
}
bool lcd_active(void)
{
return lcd_state.display_on;
}
#ifdef HAVE_LCD_SHUTDOWN
void lcd_shutdown(void)
{
lcd_sleep();
}
#endif /* HAVE_LCD_SHUTDOWN */
#endif /* HAVE_LCD_SLEEP */
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