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lpc32xx: Flash driver

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Based on the lpc3180 driver, but released as a separate driver for two reasons:
 1) I don't have an lpc3180 to test it against, so it might unintentionally break compatibility.
 2) It's using a different OOB layout than lpc3180.

Rewritten so that it no longer borrows code from the NXP CDL library.  Instead borrowing code from the u-boot port to lpc32xx, written by Kevin Wells.

Tested on lpc3250 (Hitex LPC3250-Stick).  OOB layout is compatible with LPCLinux.
This commit is contained in:
Bjarne Steinsbo
2011-02-15 20:23:40 +01:00
committed by Øyvind Harboe
parent fe0894015f
commit 3f4b9e334b
5 changed files with 1932 additions and 0 deletions
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61
src/flash/nand/ecc.c
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@@ -120,3 +120,64 @@ int nand_calculate_ecc(struct nand_device *nand, const uint8_t *dat, uint8_t *ec
return 0;
}
static inline int countbits(uint32_t byte)
{
int res = 0;
for (;byte; byte >>= 1)
res += byte & 0x01;
return res;
}
/**
* nand_correct_data - Detect and correct a 1 bit error for 256 byte block
*/
int nand_correct_data(struct nand_device *nand, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
uint8_t s0, s1, s2;
#ifdef NAND_ECC_SMC
s0 = calc_ecc[0] ^ read_ecc[0];
s1 = calc_ecc[1] ^ read_ecc[1];
s2 = calc_ecc[2] ^ read_ecc[2];
#else
s1 = calc_ecc[0] ^ read_ecc[0];
s0 = calc_ecc[1] ^ read_ecc[1];
s2 = calc_ecc[2] ^ read_ecc[2];
#endif
if ((s0 | s1 | s2) == 0)
return 0;
/* Check for a single bit error */
if( ((s0 ^ (s0 >> 1)) & 0x55) == 0x55 &&
((s1 ^ (s1 >> 1)) & 0x55) == 0x55 &&
((s2 ^ (s2 >> 1)) & 0x54) == 0x54) {
uint32_t byteoffs, bitnum;
byteoffs = (s1 << 0) & 0x80;
byteoffs |= (s1 << 1) & 0x40;
byteoffs |= (s1 << 2) & 0x20;
byteoffs |= (s1 << 3) & 0x10;
byteoffs |= (s0 >> 4) & 0x08;
byteoffs |= (s0 >> 3) & 0x04;
byteoffs |= (s0 >> 2) & 0x02;
byteoffs |= (s0 >> 1) & 0x01;
bitnum = (s2 >> 5) & 0x04;
bitnum |= (s2 >> 4) & 0x02;
bitnum |= (s2 >> 3) & 0x01;
dat[byteoffs] ^= (1 << bitnum);
return 1;
}
if(countbits(s0 | ((uint32_t)s1 << 8) | ((uint32_t)s2 <<16)) == 1)
return 1;
return -1;
}