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Code

use proper place for 2 GB ecc

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This commit is contained in:
Bas Wijnen 2010-10-14 16:11:47 +02:00
parent 8d5e29095e
commit 7e8cc1d25e
1 changed files with 55 additions and 28 deletions
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83
mips/nand.hhp
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@ -58,6 +58,7 @@ static unsigned redundant_bits
static unsigned block_bits
static unsigned size_bits
static unsigned word_size
static unsigned ecc_start
static void unbusy ():
while !(gpio_get_port (2) & (1 << 30)):
@ -117,6 +118,13 @@ static void reset ():
unsigned num_planes_bits = d >> 2 & 3
unsigned plane_bits = 26 + (d >> 4 & 7)
size_bits = plane_bits + num_planes_bits - 3
if page_bits == 11:
ecc_start = 6
else if page_bits == 12:
ecc_start = 12
else:
debug ("unknown nand type; assuming ecc offset to be 6. This is probably wrong!\n")
ecc_start = 6
static bool read (unsigned a, char *buffer):
unsigned column = a & ((1 << page_bits) - 1)
@ -134,7 +142,13 @@ static bool read (unsigned a, char *buffer):
// 33: 9-byte ecc of 4th 512 bytes
// 42: unused
// 64: end of space
unsigned col = (1 << page_bits) + 6 + 9 * (column >> 9)
// For 2 GB nand:
// 0-11: unused/bad block markers
// 12-89: 8 times 9-byte ecc
// 90-127: unused
// 128: end of space
unsigned col = (1 << page_bits) + ecc_start + 9 * (column >> 9)
cmd (CMD_READ0)
addr (col)
addr (col >> 8)
@ -143,8 +157,11 @@ static bool read (unsigned a, char *buffer):
addr (row >> 16)
cmd (CMD_READSTART)
//debug ("parity data:")
bool parity_all_ff = true
for unsigned t = 0; t < 9; ++t:
error[t] = rdata ()
if parity_all_ff && (error[t] & 0xff) != 0xff:
parity_all_ff = false
//debug (" %x", error[t] & 0xff)
//debug ("\n")
cmd (CMD_RNDOUT)
@ -153,30 +170,34 @@ static bool read (unsigned a, char *buffer):
cmd (CMD_RNDOUTSTART)
EMC_NFINTS = 0
EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_ERST
bool all_ff = true
for unsigned t = 0; t < 0x200; ++t:
buffer[t] = rdata ()
for unsigned t = 0; t < 9; ++t:
((volatile char *)&EMC_NFPAR (0))[t] = error[t]
EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_PRDY
while !(EMC_NFINTS & EMC_NFINTS_DECF):
DELAY ()
unsigned ints = EMC_NFINTS
if ints & EMC_NFINTS_UNCOR:
debug ("uncorrectable error in nand at %x\n", a)
return false
unsigned errs = (ints & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT
for unsigned i = 0; i < errs; ++i:
unsigned err = EMC_NFERR (i)
unsigned index = (err >> 16) - 1
unsigned mask = err & 0x1ff
unsigned bit = index * 9
unsigned offset= bit & 7
unsigned byte = bit / 8
debug ("correcting %x on %x+%d\n", mask, byte, offset)
unsigned data = buffer[byte] | buffer[byte + 1] << 8
data ^= mask << offset
buffer[byte] = data
buffer[byte + 1] = data >> 8
if all_ff && (buffer[t] & 0xff) != 0xff:
all_ff = false
if !all_ff || !parity_all_ff:
for unsigned t = 0; t < 9; ++t:
((volatile char *)&EMC_NFPAR (0))[t] = error[t]
EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_PRDY
while !(EMC_NFINTS & EMC_NFINTS_DECF):
DELAY ()
unsigned ints = EMC_NFINTS
if ints & EMC_NFINTS_UNCOR:
debug ("uncorrectable error in nand at %x\n", a)
return false
unsigned errs = (ints & EMC_NFINTS_ERRCNT_MASK) >> EMC_NFINTS_ERRCNT_BIT
for unsigned i = 0; i < errs; ++i:
unsigned err = EMC_NFERR (i)
unsigned index = (err >> 16) - 1
unsigned mask = err & 0x1ff
unsigned bit = index * 9
unsigned offset= bit & 7
unsigned byte = bit / 8
debug ("correcting %x on %x+%d\n", mask, byte, offset)
unsigned data = buffer[byte] | buffer[byte + 1] << 8
data ^= mask << offset
buffer[byte] = data
buffer[byte + 1] = data >> 8
#if 0
for unsigned i = 0; i < 0x10; ++i:
if (buffer[i] & 0xff) < 0x10:
@ -228,8 +249,14 @@ static void write (unsigned a, char *buffer):
// 33: 9-byte ecc of 4th 512 bytes
// 42: unused
// 64: end of space
for unsigned i = 0; i < 6; ++i:
wdata (0)
// For 2 GB nand:
// 0-11: unused/bad block markers
// 12-89: 8 times 9-byte ecc
// 90-127: unused
// 128: end of space
for unsigned i = 0; i < ecc_start; ++i:
wdata (i == 4 ? 0 : 0xff)
for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
for unsigned j = 0; j < 9; ++j:
wdata (ecc[i][j])
@ -268,9 +295,9 @@ static void write (unsigned a, char *buffer):
unsigned offset= bit & 7
unsigned byte = bit / 8
debug ("error detected by parity: %x on %x+%d\n", mask, byte, offset)
for unsigned i = 0; i < 6; ++i:
if rdata () != 0:
debug ("extra data not 0 at byte %d\n", i)
for unsigned i = 0; i < ecc_start; ++i:
if rdata () != (i == 4 ? 0 : 0xff):
debug ("incorrect extra data at byte %d\n", i)
for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
for unsigned j = 0; j < 9; ++j:
unsigned r = rdata () & 0xff