/*
* Make the table local in
* linux-2.6.27.y/drivers/mtd/nand/nand_ecc.c
*/
void mkECCtbl(void)
{
unsigned char i;
unsigned cp0, cp1, cp2, cp3, cp4, cp5;
unsigned rp;
cp0 = 0, cp1 = 0, cp2 = 0, cp3 = 0, cp4 = 0, cp5 = 0;
rp = 0;
/*
* cp0 = bit6 ^ bit4 ^ bit2 ^ bit0;
* cp1 = bit7 ^ bit5 ^ bit3 ^ bit1;
* cp2 = bit5 ^ bit4 ^ bit1 ^ bit0;
* cp3 = bit7 ^ bit6 ^ bit3 ^ bit2;
* cp4 = bit3 ^ bit2 ^ bit1 ^ bit0;
* cp5 = bit7 ^ bit6 ^ bit5 ^ bit4;
*
* rp = xor all bits;
*/
for (i = 0; i < 0xff; i++) {
unsigned char xdata = 0;
cp0 = BIT0(i) ^ BIT2(i) ^ BIT4(i) ^ BIT6(i);
if (cp0)
xdata |= 0x1;
cp1 = BIT1(i) ^ BIT3(i) ^ BIT5(i) ^ BIT7(i);
if (cp1)
xdata |= 0x2;
cp2 = BIT0(i) ^ BIT1(i) ^ BIT4(i) ^ BIT5(i);
if (cp2)
xdata |= 0x4;
cp3 = BIT2(i) ^ BIT3(i) ^ BIT6(i) ^ BIT7(i);
if (cp3)
xdata |= 0x8;
cp4 = BIT0(i) ^ BIT1(i) ^ BIT2(i) ^ BIT3(i);
if (cp4)
xdata |= 0x10;
cp5 = BIT4(i) ^ BIT5(i) ^ BIT6(i) ^ BIT7(i);
if (cp5)
xdata |= 0x20;
rp = BIT0(i) ^ BIT1(i) ^ BIT2(i) ^ BIT3(i)
^ BIT4(i) ^ BIT5(i) ^ BIT6(i) ^ BIT7(i);
if (rp)
xdata |= 0x40;
ecc_tbl[i] = xdata;
}
}
static void
calculate_ecc(const uint8_t *buf, uint8_t *ecc)
{
uint8_t p8, byte;
int i;
memset(ecc, 0, 3);
for (i = 0; i < 256; i++) {
byte = buf[i];
ecc[0] ^= (BIT0(byte) ^ BIT2(byte) ^ BIT4(byte) ^
BIT6(byte)) << 2;
ecc[0] ^= (BIT1(byte) ^ BIT3(byte) ^ BIT5(byte) ^
BIT7(byte)) << 3;
ecc[0] ^= (BIT0(byte) ^ BIT1(byte) ^ BIT4(byte) ^
BIT5(byte)) << 4;
ecc[0] ^= (BIT2(byte) ^ BIT3(byte) ^ BIT6(byte) ^
BIT7(byte)) << 5;
ecc[0] ^= (BIT0(byte) ^ BIT1(byte) ^ BIT2(byte) ^
BIT3(byte)) << 6;
ecc[0] ^= (BIT4(byte) ^ BIT5(byte) ^ BIT6(byte) ^
BIT7(byte)) << 7;
p8 = BIT0(byte) ^ BIT1(byte) ^ BIT2(byte) ^
BIT3(byte) ^ BIT4(byte) ^ BIT5(byte) ^ BIT6(byte) ^
BIT7(byte);
if (p8) {
ecc[2] ^= (0x1 << BIT0(i));
ecc[2] ^= (0x4 << BIT1(i));
ecc[2] ^= (0x10 << BIT2(i));
ecc[2] ^= (0x40 << BIT3(i));
ecc[1] ^= (0x1 << BIT4(i));
ecc[1] ^= (0x4 << BIT5(i));
ecc[1] ^= (0x10 << BIT6(i));
ecc[1] ^= (0x40 << BIT7(i));
}
}
ecc[0] = ~ecc[0];
ecc[1] = ~ecc[1];
ecc[2] = ~ecc[2];
ecc[0] |= 3;
}
static int
correct_ecc(uint8_t *buf, uint8_t *calc_ecc, uint8_t *read_ecc)
{
uint8_t ecc0, ecc1, ecc2, onesnum, bit, byte;
uint16_t addr = 0;
ecc0 = calc_ecc[0] ^ read_ecc[0];
ecc1 = calc_ecc[1] ^ read_ecc[1];
ecc2 = calc_ecc[2] ^ read_ecc[2];
if (!ecc0 && !ecc1 && !ecc2)
return (ECC_OK);
addr = BIT3(ecc0) | (BIT5(ecc0) << 1) | (BIT7(ecc0) << 2);
addr |= (BIT1(ecc2) << 3) | (BIT3(ecc2) << 4) |
(BIT5(ecc2) << 5) | (BIT7(ecc2) << 6);
addr |= (BIT1(ecc1) << 7) | (BIT3(ecc1) << 8) |
(BIT5(ecc1) << 9) | (BIT7(ecc1) << 10);
onesnum = 0;
while (ecc0 || ecc1 || ecc2) {
if (ecc0 & 1)
onesnum++;
if (ecc1 & 1)
onesnum++;
if (ecc2 & 1)
onesnum++;
ecc0 >>= 1;
ecc1 >>= 1;
ecc2 >>= 1;
}
if (onesnum == 11) {
/* Correctable error */
bit = addr & 7;
byte = addr >> 3;
buf[byte] ^= (1 << bit);
return (ECC_CORRECTABLE);
} else if (onesnum == 1) {
BYTE Pad::Update(BYTE valueP1)
{
BYTE newValue = 0;
if(!BIT5(valueP1)) {
BYTE start = (m_buttonsState[START] ? 0 : 1) << 3;
BYTE select = (m_buttonsState[SELECT] ? 0 : 1) << 2;
BYTE b = (m_buttonsState[B] ? 0 : 1) << 1;
BYTE a = (m_buttonsState[A] ? 0 : 1);
newValue = start | select | b | a;
}
else if(!BIT4(valueP1)) {
BYTE down = (m_buttonsState[DOWN] ? 0 : 1) << 3;
BYTE up = (m_buttonsState[UP] ? 0 : 1) << 2;
BYTE left = (m_buttonsState[LEFT] ? 0 : 1) << 1;
BYTE right = (m_buttonsState[RIGHT] ? 0 : 1);
newValue = down | up | left | right;
}
else {
//Desactivar los botones
newValue = 0x0F;
}
return ((valueP1 & 0xF0) | newValue);
}