/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2008 by Maurus Cuelenaere
 *
 * 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 "jz4740.h"
#include "backlight.h"
#include "font.h"
#include "lcd.h"
#include "usb.h"
#include "system.h"
#include "button.h"
#include "common.h"
#include "storage.h"
#include "disk.h"
#include "string.h"
#include "adc.h"

extern int show_logo(void);
extern void power_off(void);

static void show_splash(int timeout, const char *msg)
{
    reset_screen();
    lcd_putsxy( (LCD_WIDTH - (SYSFONT_WIDTH * strlen(msg))) / 2,
                (LCD_HEIGHT - SYSFONT_HEIGHT) / 2, msg);
    lcd_update();

    sleep(timeout);
}

static void usb_mode(void)
{
    int button;

    /* Init USB */
    usb_init();
    usb_start_monitoring();

    /* Wait for threads to connect */
    show_splash(HZ/2, "Waiting for USB");

    while (1)
    {
        button = button_get_w_tmo(HZ/2);

        if (button == SYS_USB_CONNECTED)
            break; /* Hit */
    }

    if (button == SYS_USB_CONNECTED)
    {
        /* Got the message - wait for disconnect */
        show_splash(0, "Bootloader USB mode");

        usb_acknowledge(SYS_USB_CONNECTED_ACK);

        while (1)
        {
            button = button_get(true);
            if (button == SYS_USB_DISCONNECTED)
            {
                usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
                break;
            }
        }
    }

    reset_screen();
}

static int boot_of(void)
{
    int fd, rc, len, i, checksum = 0;
    void (*kernel_entry)(int, void*, void*);

    /* TODO: get this from the NAND flash instead of SD */
    fd = open("/ccpmp.bin", O_RDONLY);
    if(fd < 0)
        return EFILE_NOT_FOUND;

    lseek(fd, 4, SEEK_SET);
    rc = read(fd, (char*)&len, 4); /* CPU is LE */
    if(rc < 4)
        return EREAD_IMAGE_FAILED;

    len += 8;
    printf("Reading %d bytes...", len);

    lseek(fd, 0, SEEK_SET);
    rc = read(fd, (void*)0x80004000, len);
    if(rc < len)
        return EREAD_IMAGE_FAILED;

    close(fd);

    for(i=0; i<len; i++)
        checksum += ((unsigned char*)0x80004000)[i];

    *((unsigned int*)0x80004000) = checksum;

    printf("Starting the OF...");

    /* OF requires all clocks on */
    __cpm_start_all();

    disable_interrupt();
    __dcache_writeback_all();
    __icache_invalidate_all();

    for(i=8000; i>0; i--)
        asm volatile("nop\n");

    kernel_entry = (void*) 0x80004008;
    kernel_entry(0, "Jan 10 2008", "15:34:42"); /* Reversed from the SPL */

    return 0; /* Shouldn't happen */
}

static int boot_rockbox(void)
{
    int rc;
    void (*kernel_entry)(void);

    printf("Loading firmware");
    rc = load_firmware((unsigned char *)CONFIG_SDRAM_START, BOOTFILE, 0x400000);
    if(rc < 0)
        return rc;
    else
    {
        printf("Starting Rockbox...");
        adc_close(); /* Disable SADC, seems to fix the re-init Rockbox does */

        disable_interrupt();
        kernel_entry = (void*) CONFIG_SDRAM_START;
        kernel_entry();

        return 0; /* Shouldn't happen */
    }
}

#define RECT_X        (LCD_WIDTH/8)
#define RECT_Y(i)     (LCD_HEIGHT/20 + LCD_HEIGHT/10*i + RECT_HEIGHT*i)
#define RECT_WIDTH    (LCD_WIDTH*3/4)
#define RECT_HEIGHT   (LCD_HEIGHT/ARRAYLEN(strings) - LCD_HEIGHT/10)
#define TEXT_X(i)     (RECT_X + RECT_WIDTH/2 - strlen(strings[i])*SYSFONT_WIDTH/2)
#define TEXT_Y(i)     (RECT_Y(i) + RECT_HEIGHT/2 - SYSFONT_HEIGHT/2)
static int boot_menu(void)
{
    const char* strings[] = {"Boot Rockbox", "Boot OF", "USB mode"};
    int button, touch;
    unsigned int i;

    adc_init();

redraw:
    lcd_clear_display();
    for(i=0; i<ARRAYLEN(strings); i++)
    {
        lcd_drawrect(RECT_X, RECT_Y(i), RECT_WIDTH, RECT_HEIGHT);
        lcd_putsxy(TEXT_X(i), TEXT_Y(i), strings[i]);
    }
    lcd_update();

    while(1)
    {
        button = button_get_w_tmo(HZ/4);
        if(button & (BUTTON_TOUCHSCREEN|BUTTON_REPEAT))
        {
            touch = button_get_data();
            unsigned int x = touch & 0xFFFF, y = touch >> 16;
            int found = -1;
            for(i=0; i<ARRAYLEN(strings); i++)
            {
                if(x > RECT_X && x < RECT_X+RECT_WIDTH &&
                   y > RECT_Y(i) && y < RECT_Y(i)+RECT_HEIGHT)
                {
                    found = i;
                    break;
                }
            }

            switch(found)
            {
                case 0:
                    return boot_rockbox();
                case 1:
                    return boot_of();
                case 2:
                    usb_mode();
                    break;
            }

            if(found != -1)
                goto redraw;
        }
        else if(button & (BUTTON_POWER|BUTTON_REPEAT))
            power_off();
    }
}

int main(void)
{
    int rc;
#ifdef HAVE_TOUCHSCREEN
    int dummy;
#endif

    kernel_init();
    lcd_init();
    font_init();
    lcd_setfont(FONT_SYSFIXED);
    button_init();
    backlight_init();

    show_logo();

    rc = storage_init();
    if(rc)
        error(EATA, rc);

#ifdef HAVE_TOUCHSCREEN
    rc = button_read_device(&dummy);
#else
    rc = button_read_device();
#endif

    if(rc)
        verbose = true;

#ifdef BUTTON_VOL_UP
    if(rc & BUTTON_VOL_UP ||
#endif
       0)
        rc = boot_menu();

    if(verbose)
        reset_screen();
    printf(MODEL_NAME" Rockbox Bootloader");
    printf("Version "APPSVERSION);

    rc = disk_mount_all();
    if (rc <= 0)
        error(EDISK,rc);

#ifdef HAS_BUTTON_HOLD
    if(button_hold())
        rc = boot_of();
    else
#endif
        rc = boot_rockbox();

    if(rc < 0)
        printf("Error: %s", strerror(rc));

    /* Halt */
    while (1)
        core_idle();

    return 0;
}