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rockbox/bootloader/ipod.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Dave Chapman
*
* Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
* and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
*
* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "cpu.h"
#include "system.h"
#include "lcd.h"
#include "../kernel-internal.h"
#include "ata.h"
#include "file_internal.h"
#include "disk.h"
#include "font.h"
#include "adc.h"
#include "backlight.h"
#include "panic.h"
#include "power.h"
#include "file.h"
#include "common.h"
#include "rb-loader.h"
#include "loader_strerror.h"
#include "hwcompat.h"
#include "usb.h"
#include "version.h"
#define XSC(X) #X
#define SC(X) XSC(X)
/* Maximum allowed firmware image size. The largest known current
(December 2006) firmware is about 7.5MB (Apple's firmware for the ipod video)
so we set this to 8MB. */
#define MAX_LOADSIZE (8*1024*1024)
/* A buffer to load the Linux kernel or Rockbox into */
unsigned char *loadbuffer = (unsigned char *)DRAM_START;
#if CONFIG_KEYPAD == IPOD_4G_PAD && !defined(IPOD_MINI)
/* check if number of seconds has past */
int timer_check(int clock_start, unsigned int usecs)
{
if ((USEC_TIMER - clock_start) >= usecs) {
return 1;
} else {
return 0;
}
}
static void ser_opto_keypad_cfg(int val)
{
int start_time;
GPIOB_ENABLE &=~ 0x80;
outl(inl(0x7000c104) | 0xc000000, 0x7000c104);
outl(val, 0x7000c120);
outl(inl(0x7000c100) | 0x80000000, 0x7000c100);
GPIOB_OUTPUT_VAL &=~ 0x10;
GPIOB_OUTPUT_EN |= 0x10;
start_time = USEC_TIMER;
do {
if ((inl(0x7000c104) & 0x80000000) == 0) {
break;
}
} while (timer_check(start_time, 1500) != 0);
outl(inl(0x7000c100) & ~0x80000000, 0x7000c100);
GPIOB_ENABLE |= 0x80;
GPIOB_OUTPUT_VAL |= 0x10;
GPIOB_OUTPUT_EN &=~0x10;
outl(inl(0x7000c104) | 0xc000000, 0x7000c104);
outl(inl(0x7000c100) | 0x60000000, 0x7000c100);
}
int opto_keypad_read(void)
{
int loop_cnt, had_io = 0;
for (loop_cnt = 5; loop_cnt != 0;)
{
int key_pressed = 0;
int start_time;
unsigned int key_pad_val;
ser_opto_keypad_cfg(0x8000023a);
start_time = USEC_TIMER;
do {
if (inl(0x7000c104) & 0x4000000) {
had_io = 1;
break;
}
if (had_io != 0) {
break;
}
} while (timer_check(start_time, 1500) != 0);
key_pad_val = inl(0x7000c140);
if ((key_pad_val & ~0x7fff0000) != 0x8000023a) {
loop_cnt--;
} else {
key_pad_val = (key_pad_val << 11) >> 27;
key_pressed = 1;
}
outl(inl(0x7000c100) | 0x60000000, 0x7000c100);
outl(inl(0x7000c104) | 0xc000000, 0x7000c104);
if (key_pressed != 0) {
return key_pad_val ^ 0x1f;
}
}
return 0;
}
#endif
static int key_pressed(void)
{
unsigned char state;
#if CONFIG_KEYPAD == IPOD_4G_PAD
#ifdef IPOD_MINI /* mini 1G only */
state = GPIOA_INPUT_VAL & 0x3f;
if ((state & 0x10) == 0) return BUTTON_LEFT;
if ((state & 0x2) == 0) return BUTTON_MENU;
if ((state & 0x4) == 0) return BUTTON_PLAY;
if ((state & 0x8) == 0) return BUTTON_RIGHT;
#else
state = opto_keypad_read();
if ((state & 0x4) == 0) return BUTTON_LEFT;
if ((state & 0x10) == 0) return BUTTON_MENU;
if ((state & 0x8) == 0) return BUTTON_PLAY;
if ((state & 0x2) == 0) return BUTTON_RIGHT;
#endif
#elif (CONFIG_KEYPAD == IPOD_3G_PAD) || (CONFIG_KEYPAD == IPOD_1G2G_PAD)
state = GPIOA_INPUT_VAL;
if ((state & 0x08) == 0) return BUTTON_LEFT;
if ((state & 0x10) == 0) return BUTTON_MENU;
if ((state & 0x04) == 0) return BUTTON_PLAY;
if ((state & 0x01) == 0) return BUTTON_RIGHT;
#endif
return 0;
}
bool button_hold(void)
{
#if CONFIG_KEYPAD == IPOD_1G2G_PAD
return (GPIOA_INPUT_VAL & 0x20);
#else
return !(GPIOA_INPUT_VAL & 0x20);
#endif
}
void fatal_error(void)
{
extern int line;
bool holdstatus=false;
/* System font is 6 pixels wide */
#if defined(IPOD_1G2G) || defined(IPOD_3G)
printf("Insert Firewire cable, or");
printf("hold MENU+PLAY to reboot");
printf("then REW+FF for disk mode");
#elif LCD_WIDTH >= (30*6)
printf("Insert USB cable, or");
printf("hold MENU+SELECT to reboot");
printf("then SELECT+PLAY for disk mode");
#else
printf("Insert USB cable, or");
printf("hold MENU+SELECT to");
printf("reboot then SELECT+PLAY");
printf("for disk mode");
#endif
lcd_update();
usb_init();
while (1) {
if (button_hold() != holdstatus) {
if (button_hold()) {
holdstatus=true;
lcd_puts(0, line, "Hold switch on!");
} else {
holdstatus=false;
lcd_puts(0, line, " ");
}
lcd_update();
}
if (usb_detect() == USB_INSERTED) {
ata_sleepnow(); /* Immediately spindown the disk. */
sleep(HZ*2);
#if CONFIG_CPU == PP5020
memcpy((void *)0x40017f00, "diskmode\0\0hotstuff\0\0\1", 21);
#elif CONFIG_CPU == PP5022
memcpy((void *)0x4001ff00, "diskmode\0\0hotstuff\0\0\1", 21);
#elif CONFIG_CPU == PP5002
memcpy((void *)0x40017f00, "diskmodehotstuff\1", 17);
#endif /* CONFIG_CPU */
system_reboot(); /* Reboot */
}
udelay(100000); /* 100ms */
}
}
/* The bootloader is started from the OSOS image on the firmware
* partition. There are several ways it can be installed there:
* appended to the Apple firmware, on its own, or appended to
* Rockbox itself. The Apple ROM loader loads the entire OSOS
* image to DRAM_START, whatever it contains. If the bootloader
* is appended to another image then it will've modified the
* entry point in the OSOS header such that the ROM will call the
* bootloader rather than the main image.
*
* So, once the bootloader has control:
*
* 1) If the hold switch is on, or the menu button is being held,
* try to boot the Apple firmware.
* 1a) First, it looks for apple_os.ipod on the FAT32 partition,
* in .rockbox or the root directory. If found it loads that
* without further checking and runs it.
* 1b) Next, it checks to see if the OSOS image already loaded
* into RAM is in fact the Apple firmware with the bootloader
* appended. It looks at DRAM_START+0x20 for the string
* "portalplayer", and if it's there, just jumps back to
* DRAM_START where the entry point was before the bootloader
* was appended.
* 1c) If neither of those worked, it displays an error and dies.
*
* 2) If the play button is being held, try to boot Linux. It looks
* for linux.bin in the root directory, and if it's not there,
* it displays an error and dies.
*
* 3) Otherwise, try to boot Rockbox.
* 3a) First, it looks for rockbox.ipod on the FAT32 partition,
* in .rockbox or the root directory. If found it loads that
* without further checking and runs it.
* 3b) Next, it checks to see if the OSOS image already loaded
* into RAM is in fact Rockbox with the bootloader appended.
* It looks at DRAM_START+0x20 for the string "Rockbox\1"
* (which is inserted there in crt0-pp.S), and if it's there,
* just humps back to DRAM_START where the entry point was
* before the bootloader was appended.
* 3c) If neither of those worked, it displays an error and dies.
*
* The result is that any of the three install configurations work,
* and that images of apple_os.ipod or rockbox.ipod on the FAT32
* partition take priority over the contents of OSOS (this avoids
* upgrades failing to work if OSOS is not updated).
*
* Loading from OSOS is somewhat faster than loading from FAT32,
* because the Apple ROM doesn't have to deal with filesystems or
* fragmentation, and is already loading from OSOS anyway. Thus,
* the fastest boot configuration that still allows dual booting
* is to install Rockbox into OSOS with the bootloader appended
* (and delete/rename rockbox.ipod from the FAT32 partition).
*
* It is of course faster to just install Rockbox to OSOS alone,
* but then it's impossible to boot the Apple firmware.
*/
void* main(void)
{
char buf[256];
int i;
int btn;
int rc;
bool haveramos;
bool button_was_held;
struct partinfo pinfo;
unsigned short* identify_info;
/* Check the button hold status as soon as possible - to
give the user maximum chance to turn it off in order to
reset the settings in rockbox. */
button_was_held = button_hold();
system_init();
kernel_init();
lcd_init();
font_init();
#ifndef HAVE_BACKLIGHT_INVERSION
backlight_init(); /* Turns on the backlight BUGFIX backlight_init MUST BE AFTER lcd_init */
#endif
#ifdef HAVE_LCD_COLOR
lcd_set_foreground(LCD_WHITE);
lcd_set_background(LCD_BLACK);
lcd_clear_display();
#endif
#if 0
/* ADC and button drivers are not yet implemented */
adc_init();
button_init();
#endif
btn=key_pressed();
/* Enable bootloader messages */
if (btn==BUTTON_RIGHT)
verbose = true;
lcd_setfont(FONT_SYSFIXED);
printf("Rockbox boot loader");
printf("Version: %s", rbversion);
printf("IPOD version: 0x%08x", IPOD_HW_REVISION);
i=ata_init();
if (i==0) {
identify_info=ata_get_identify();
/* Show model */
for (i=0; i < 20; i++) {
((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
}
buf[40]=0;
for (i=39; i && buf[i]==' '; i--) {
buf[i]=0;
}
printf(buf);
} else {
printf("ATA: %d", i);
}
filesystem_init();
rc = disk_mount_all();
if (rc<=0)
{
printf("No partition found");
fatal_error();
}
disk_partinfo(1, &pinfo);
printf("Partition 1: 0x%02x %ld sectors",
pinfo.type, pinfo.size);
if (button_was_held || (btn==BUTTON_MENU)) {
/* If either the hold switch was on, or the Menu button was held, then
try the Apple firmware */
printf("Loading original firmware...");
/* First try an apple_os.ipod file on the FAT32 partition
(either in .rockbox or the root)
*/
rc=load_firmware(loadbuffer, "apple_os.ipod", MAX_LOADSIZE);
if (rc > 0) {
printf("apple_os.ipod loaded.");
return (void*)DRAM_START;
} else if (rc == EFILE_NOT_FOUND) {
/* If apple_os.ipod doesn't exist, then check if there is an Apple
firmware image in RAM */
haveramos = (memcmp((void*)(DRAM_START+0x20),"portalplayer",12)==0);
if (haveramos) {
/* We have a copy of the retailos in RAM, lets just run it. */
return (void*)DRAM_START;
}
} else {
printf("Error!");
printf("Can't load apple_os.ipod:");
printf(loader_strerror(rc));
}
/* Everything failed - just loop forever */
printf("No RetailOS detected");
} else if (btn==BUTTON_PLAY) {
printf("Loading Linux...");
rc=load_raw_firmware(loadbuffer, "/linux.bin", MAX_LOADSIZE);
if (rc <= EFILE_EMPTY) {
printf("Error!");
printf("Can't load linux.bin:");
printf(loader_strerror(rc));
} else {
return (void*)DRAM_START;
}
} else {
printf("Loading Rockbox...");
rc=load_firmware(loadbuffer, BOOTFILE, MAX_LOADSIZE);
if (rc > 0) {
printf("Rockbox loaded.");
return (void*)DRAM_START;
} else if (rc == EFILE_NOT_FOUND) {
/* if rockbox.ipod doesn't exist, then check if there is a Rockbox
image in RAM */
haveramos = (memcmp((void*)(DRAM_START+0x20),"Rockbox\1",8)==0);
if (haveramos) {
/* We have a copy of Rockbox in RAM, lets just run it. */
return (void*)DRAM_START;
}
}
printf("Error!");
printf("Can't load " BOOTFILE ": ");
printf(loader_strerror(rc));
}
/* If we get to here, then we haven't been able to load any firmware */
fatal_error();
/* We never get here, but keep gcc happy */
return (void*)0;
}
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