bootloader/sansa_as3525.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Rafaël Carré
  11  *
  12  * Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
  13  * and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  21  * KIND, either express or implied.
  22  *
  23  ****************************************************************************/
  24
  25 #include <stdio.h>
  26 #include <system.h>
  27 #include <inttypes.h>
  28 #include "config.h"
  29 #include "lcd.h"
  30 #include "usb.h"
  31 #include "sysfont.h"
  32 #include "backlight.h"
  33 #include "button-target.h"
  34 #include "common.h"
  35 #include "storage.h"
  36 #include "disk.h"
  37 #include "panic.h"
  38 #include "power.h"
  39
  40 int show_logo(void);
  41
  42 static void usb_mode(void)
  43 {
  44     if(usb_detect() != USB_INSERTED)
  45     {
  46         const char msg[] = "Plug USB cable";
  47         reset_screen();
  48         lcd_putsxy( (LCD_WIDTH - (SYSFONT_WIDTH * sizeof(msg))) / 2,
  49                     (LCD_HEIGHT - SYSFONT_HEIGHT) / 2, msg);
  50         lcd_update();
  51
  52         /* wait until USB is plugged */
  53         while(usb_detect() != USB_INSERTED) ;
  54     }
  55
  56     const char msg[] = "Bootloader USB mode";
  57     reset_screen();
  58     lcd_putsxy( (LCD_WIDTH - (SYSFONT_WIDTH * sizeof(msg))) / 2,
  59                 (LCD_HEIGHT - SYSFONT_HEIGHT) / 2, msg);
  60     lcd_update();
  61
  62     while(usb_detect() == USB_INSERTED)
  63         sleep(HZ);
  64
  65     reset_screen();
  66     lcd_update();
  67 }
  68
  69 void main(void) __attribute__((noreturn));
  70 void main(void)
  71 {
  72     unsigned char* loadbuffer;
  73     int buffer_size;
  74     void(*kernel_entry)(void);
  75     int ret;
  76
  77     system_init();
  78     kernel_init();
  79
  80     enable_irq();
  81
  82     lcd_init();
  83     show_logo();
  84
  85     backlight_init();
  86
  87     button_init_device();
  88     int btn = button_read_device();
  89
  90 #if !defined(SANSA_FUZE) && !defined(SANSA_CLIP) && !defined(SANSA_CLIPV2) \
  91     && !defined(SANSA_CLIPPLUS)
  92     if (button_hold())
  93     {
  94         verbose = true;
  95         lcd_clear_display();
  96         printf("Hold switch on");
  97         printf("Shutting down...");
  98         sleep(HZ);
  99         power_off();
 100     }
 101 #endif
 102
 103     /* Enable bootloader messages if any button is pressed */
 104     if (btn)
 105     {
 106         lcd_clear_display();
 107         verbose = true;
 108     }
 109
 110     ret = storage_init();
 111     if(ret < 0)
 112         error(EATA, ret, true);
 113
 114     usb_init();
 115     usb_start_monitoring();
 116
 117     /* Enter USB mode if USB is plugged and SELECT button is pressed */
 118     if(btn & BUTTON_SELECT && usb_detect() == USB_INSERTED)
 119         usb_mode();
 120
 121     while(!disk_init(IF_MV(0)))
 122         usb_mode();
 123
 124     while((ret = disk_mount_all()) <= 0)
 125     {
 126         error(EDISK, ret, false);
 127         usb_mode();
 128     }
 129
 130     printf("Loading firmware");
 131
 132     loadbuffer = (unsigned char*)DRAM_ORIG; /* DRAM */
 133     buffer_size = (int)(loadbuffer + (DRAM_SIZE) - TTB_SIZE);
 134
 135     while((ret = load_firmware(loadbuffer, BOOTFILE, buffer_size)) < 0)
 136     {
 137         error(EBOOTFILE, ret, false);
 138         usb_mode();
 139     }
 140
 141     kernel_entry = (void*) loadbuffer;
 142     cpucache_invalidate();
 143     printf("Executing");
 144     kernel_entry();
 145     printf("ERR: Failed to boot");
 146
 147     /* never returns */
 148     while(1) ;
 149 }