#include <stdio.h>
#include <system.h>

#define BYPASS_DCACHE   (0x1 << 31)

typedef volatile unsigned int vu32;
typedef unsigned int u32;
typedef unsigned char u8;

#define REG_USBCNT          (*(vu32*)((USB_BASE+0x0) | BYPASS_DCACHE))

#define REG_BUTTONS         (*(vu32*)(BUTTONS_BASE | BYPASS_DCACHE))
#define REG_MMCCNT          (*(vu32*)((DSNAND_BASE+0x0) | BYPASS_DCACHE))
#define REG_MMCCMD0         (*(vu32*)((DSNAND_BASE+0x4) | BYPASS_DCACHE))
#define REG_MMCCMD1         (*(vu32*)((DSNAND_BASE+0x8) | BYPASS_DCACHE))
#define REG_MMCCMD2         (*(vu32*)((DSNAND_BASE+0xC) | BYPASS_DCACHE))
#define REG_MMCCMD3         (*(vu32*)((DSNAND_BASE+0x10) | BYPASS_DCACHE))
#define REG_MMCCMD4         (*(vu32*)((DSNAND_BASE+0x14) | BYPASS_DCACHE))
#define REG_MMCFIFO         (*(vu32*)((DSNAND_BASE+0x18) | BYPASS_DCACHE))


typedef struct
{
    unsigned char command[5];
    unsigned int responsesize;
    unsigned int datasize;
} MmcCommand;

MmcCommand CMD0   = { {0,  0x00, 0x00, 0x00, 0x00}, 0,   0};
MmcCommand CMD1   = { {1,  0x0F, 0xF0, 0x00, 0x00}, 47,  0};
MmcCommand CMD2   = { {2,  0x00, 0x00, 0x00, 0x00}, 135, 0};
MmcCommand CMD3   = { {3,  0x00, 0x01, 0x00, 0x00}, 47,  0};
MmcCommand CMD7   = { {7,  0x00, 0x01, 0x00, 0x00}, 47,  0};
MmcCommand CMD9   = { {9,  0x00, 0x01, 0x00, 0x00}, 135, 0};
MmcCommand CMD16  = { {16, 0x00, 0x00, 0x02, 0x00}, 47,  0};
MmcCommand CMD17  = { {17, 0x00, 0x00, 0x00, 0x00}, 47,  129};



const unsigned short mmc_crctable[256] =
{
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
    0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
    0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
    0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
    0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
    0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
    0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
    0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
    0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
    0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
    0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
    0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
    0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
    0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
    0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
    0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
    0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
    0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
    0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
    0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
    0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
    0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
    0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};


unsigned short MMC_CRC16(const u8* data, u32 length)
{
    int i;
    unsigned short crc = 0;

    for(i=0; i<length; i++)
    {
        crc = ( crc << 8 ) ^ mmc_crctable[ ( crc >> 8 ) ^ data[i] ];
    }
    return crc;
}


unsigned char MMC_CRC7(const unsigned char* in, unsigned int length)
{
    int i,j;

    unsigned char byte, crc=0;

    for(i=0; i < length; i++)
    {
        byte = in[i];

        for(j=0; j<8; j++)
        {
            crc <<= 1;
            if ((crc ^ byte) & 0x80)
                crc ^= 0x09;
            byte<<=1;
        }

        crc &= 0x7f;
    }

  return crc;
}

int MMC_ReadFifo(u32* data)
{
    u32 tmp;

    if (REG_MMCCNT & (1<<23))
        return 0;

    tmp = REG_MMCFIFO;

    if (data)
        *data = tmp;

    return 1;
}

void MMC_FlushFifo()
{
    while(1)
    {
        if (0 == MMC_ReadFifo(0))
            break;
    }
}

void MMC_SendCommand(const MmcCommand* cmd)
{
    unsigned char frame[6];

    frame[0] = (cmd->command[0] & 0x7F) | 0x40;
    frame[1] = cmd->command[1];
    frame[2] = cmd->command[2];
    frame[3] = cmd->command[3];
    frame[4] = cmd->command[4];
    frame[5] = (MMC_CRC7(frame, 5)<<1) | 1;

    MMC_FlushFifo();

    REG_MMCCMD0 = (frame[2]<<24) | (frame[3]<<16) | (frame[4]<<8) | (frame[5]<<0);
    REG_MMCCMD1 = (frame[0]<<8) | (frame[1]<<0);

    REG_MMCCNT = (1<<29) | (cmd->datasize<<8) | (cmd->responsesize);
}


void MMC_Init()
{
    REG_MMCCNT = (1<<30) | (1<<28);

    while( 0 == (REG_MMCCNT & (1<<26)) )
    {
    }
}

void MMC_SetClockMode(u32 mode)
{
    mode &= 1;

    REG_MMCCNT = (1<<28) | (mode<<27);
}

void MMC_WaitIdle()
{
    while(0 == (REG_MMCCNT & (1<<25)))
    {
        //printf("Waiting command (%x)..\n", REG_MMCCNT);
    }
}

void MMC_WaitResponse()
{
    while(0 == (REG_MMCCNT & (1<<24)))
    {
        //printf("Waiting command (%x)..\n", REG_MMCCNT);
    }
}

void MMC_WaitResponse32(u32* response)
{
    MMC_WaitResponse();
    MMC_WaitIdle();

    *response = ((REG_MMCCMD1 & 0xFF) << 24) | (REG_MMCCMD0>>8);
}

void MMC_WaitResponse128(u32* response)
{
    MMC_WaitResponse();
    MMC_WaitIdle();

    response[0] = (REG_MMCCMD4<<24) | (REG_MMCCMD3>>8);
    response[1] = (REG_MMCCMD3<<24) | (REG_MMCCMD2>>8);
    response[2] = (REG_MMCCMD2<<24) | (REG_MMCCMD1>>8);
    response[3] = (REG_MMCCMD1<<24) | (REG_MMCCMD0>>8);
}

void USB_Wait()
{
    while( REG_USBCNT & (1<<31) )
    {
    }
}

void USB_Write(u8 data)
{
    USB_Wait();

    REG_USBCNT = (1<<31) | data;

    USB_Wait();
}


int main()
{
    u32 i;
    u32 status;
    u32 ocr;
    u32 cid[4];
    u32 csd[4];

    u32 buf[129];
    u8* buf8 = (u8*)&buf;

    while( REG_BUTTONS & (1<<2) );

    MMC_Init();

    MMC_SendCommand(&CMD0);
    MMC_WaitIdle();

    while(1)
    {
        MMC_SendCommand(&CMD1);
        MMC_WaitResponse32(&ocr);

        printf("OCR = %08X\n", ocr);

        if (ocr & 0x80000000)
            break;
    }

    MMC_SendCommand(&CMD2);
    MMC_WaitResponse128(cid);

    printf("CID = %08X%08X%08X%08X\n", cid[0], cid[1], cid[2], cid[3]);

    MMC_SendCommand(&CMD3);
    MMC_WaitResponse32(&status);

    printf("Status = %08X\n", status);

    MMC_SendCommand(&CMD9);
    MMC_WaitResponse128(csd);

    printf("CSD = %08X%08X%08X%08X\n", csd[0], csd[1], csd[2], csd[3]);

    MMC_SendCommand(&CMD7);
    MMC_WaitResponse32(&status);

    printf("Status = %08X\n", status);

    MMC_SendCommand(&CMD16);
    MMC_WaitResponse32(&status);

    printf("Status = %08X\n", status);

    MMC_SetClockMode(1);

    u32 sector = 0;
    int percentage = 0, lastpercentage = -1;

    for(sector=0; sector<491520; sector++)
    {
        u32 address = sector * 512;

        CMD17.command[1] = address>>24;
        CMD17.command[2] = address>>16;
        CMD17.command[3] = address>>8;
        CMD17.command[4] = address>>0;

        MMC_SendCommand(&CMD17);
        MMC_WaitResponse32(&status);

        for(i=0; i<129; i++)
        {
            if (0 == MMC_ReadFifo(buf+i))
                break;
        }

        for(i=0; i<514; i++)
            USB_Write(buf8[i]);

        percentage = sector * 100 / 491520;

        if (percentage != lastpercentage)
        {
            lastpercentage = percentage;
            printf("Dumping %d%%..\n", percentage);
        }
    }

    for(;;)
    {
    }

    return 0;
}