[U-Boot-Users] [PATCH 7/8] New board SIMPC8313 support: nand support
Ron Madrid
ron_madrid at sbcglobal.net
Fri May 30 20:20:32 CEST 2008
New board SIMPC8313 support: nand support
I realize that perhaps these files should be in the
drivers/mtd/nand folder, but I have been informed by
Scott Wood that he will be soon working on nand
support for the MPC83XX(?) family of chips. So these
will be considered temporary and removed at that time.
Signed-off-by: Ron Madrid
---
board/sheldon/simpc8313/nand.c | 868
++++++++++++++++++++++++++++++++++++
board/sheldon/simpc8313/nand_ecc.c | 214 +++++++++
2 files changed, 1082 insertions(+), 0 deletions(-)
create mode 100644 board/sheldon/simpc8313/nand.c
create mode 100644 board/sheldon/simpc8313/nand_ecc.c
diff --git a/board/sheldon/simpc8313/nand.c
b/board/sheldon/simpc8313/nand.c
new file mode 100644
index 0000000..a8fbf96
--- /dev/null
+++ b/board/sheldon/simpc8313/nand.c
@@ -0,0 +1,868 @@
+/*
+ * Copyright (C) Freescale Semiconductor, Inc. 2006.
+ *
+ * Initialized by Nick.Spence at freescale.com
+ * Wilson.Lo at freescale.com
+ *
+ * See file CREDITS for list of people who
contributed to this
+ * project.
+ *
+ * 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 program is distributed in the hope that it
will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied
warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General
Public License
+ * along with this program; if not, write to the Free
Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_CMD_NAND
+#if defined(CFG_NAND_LEGACY)
+ #error "U-Boot legacy NAND commands not supported."
+#else
+
+#include <malloc.h>
+#include <asm/errno.h>
+#include <nand.h>
+
+#undef CFG_FCM_DEBUG
+#define CFG_FCM_DEBUG_LVL 1
+#ifdef CFG_FCM_DEBUG
+#define FCM_DEBUG(n, args...) \
+ do { \
+ if (n <= (CFG_FCM_DEBUG_LVL + 0)) \
+ printf(args); \
+ } while(0)
+#else /* CONFIG_FCM_DEBUG */
+#define FCM_DEBUG(n, args...) do { } while(0)
+#endif
+
+#define MIN(x, y) ((x < y) ? x : y)
+
+#define ERR_BYTE 0xFF /* Value returned for read
bytes when read failed */
+
+#define FCM_TIMEOUT_USECS 100000 /* Maximum number of
uSecs to wait for FCM */
+
+/* Private structure holding NAND Flash device
specific information */
+struct fcm_nand {
+ int bank; /* Chip select bank number
*/
+ unsigned int base; /* Chip select base address
*/
+ int pgs; /* NAND page size
*/
+ int oobbuf; /* Pointer to OOB block
*/
+ unsigned int page; /* Last page written to /
read from */
+ unsigned int fmr; /* FCM Flash Mode Register
value */
+ unsigned int mdr; /* UPM/FCM Data Register
value */
+ unsigned int use_mdr; /* Non zero if the MDR is
to be set */
+ u_char *addr; /* Address of assigned
FCM buffer */
+ unsigned int read_bytes; /* Number of bytes read
during command */
+ unsigned int index; /* Pointer to next byte to
'read' */
+ unsigned int req_bytes; /* Number of bytes read if
command ok */
+ unsigned int req_index; /* New read index if
command ok */
+ unsigned int status; /* status read from LTESR
after last op*/
+};
+
+
+/* These map to the positions used by the FCM
hardware ECC generator */
+
+/* Small Page FLASH with FMR[ECCM] = 0 */
+static struct nand_oobinfo fcm_oob_sp_eccm0 = { /*
TODO */
+ .useecc = MTD_NANDECC_AUTOPL_USR, /*
MTD_NANDECC_PLACEONLY, */
+ .eccbytes = 3,
+ .eccpos = {6, 7, 8},
+ .oobfree = { {0, 5}, {9, 7} }
+};
+
+/* Small Page FLASH with FMR[ECCM] = 1 */
+static struct nand_oobinfo fcm_oob_sp_eccm1 = { /*
TODO */
+ .useecc = MTD_NANDECC_AUTOPL_USR, /*
MTD_NANDECC_PLACEONLY, */
+ .eccbytes = 3,
+ .eccpos = {8, 9, 10},
+ .oobfree = { {0, 5}, {6, 2}, {11, 5} }
+};
+
+/* Large Page FLASH with FMR[ECCM] = 0 */
+static struct nand_oobinfo fcm_oob_lp_eccm0 = {
+ .useecc = MTD_NANDECC_AUTOPL_USR, /*
MTD_NANDECC_PLACEONLY, */
+ .eccbytes = 12,
+ .eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55,
56},
+ .oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13},
{57, 7} }
+};
+
+/* Large Page FLASH with FMR[ECCM] = 1 */
+static struct nand_oobinfo fcm_oob_lp_eccm1 = {
+ .useecc = MTD_NANDECC_AUTOPL_USR, /*
MTD_NANDECC_PLACEONLY, */
+ .eccbytes = 12,
+ .eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57,
58},
+ .oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13},
{59, 5} }
+};
+
+/*
+ * execute FCM command and wait for it to complete
+ */
+static int fcm_run_command(struct mtd_info *mtd)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+ long long end_tick;
+
+ /* Setup the FMR[OP] to execute without write
protection */
+ lbc->fmr = fcm->fmr | 3;
+ if (fcm->use_mdr)
+ lbc->mdr = fcm->mdr;
+
+ FCM_DEBUG(5,"fcm_run_command: fmr= %08X fir= %08X
fcr= %08X\n",
+ lbc->fmr, lbc->fir, lbc->fcr);
+ FCM_DEBUG(5,"fcm_run_command: fbar=%08X fpar=%08X
fbcr=%08X bank=%d\n",
+ lbc->fbar, lbc->fpar, lbc->fbcr, fcm->bank);
+
+ /* clear event registers */
+ lbc->lteatr = 0;
+ lbc->ltesr |= (LTESR_FCT | LTESR_PAR | LTESR_CC);
+
+ /* execute special operation */
+ lbc->lsor = fcm->bank;
+
+ /* wait for FCM complete flag or timeout */
+ fcm->status = 0;
+ end_tick = usec2ticks(FCM_TIMEOUT_USECS) +
get_ticks();
+
+ while (end_tick > get_ticks()) {
+ if (lbc->ltesr & LTESR_CC) {
+ fcm->status = lbc->ltesr &
+ (LTESR_FCT | LTESR_PAR | LTESR_CC);
+ break;
+ }
+ }
+
+ /* store mdr value in case it was needed */
+ if (fcm->use_mdr)
+ fcm->mdr = lbc->mdr;
+
+ fcm->use_mdr = 0;
+
+ FCM_DEBUG(5,"fcm_run_command: stat=%08X mdr= %08X
fmr= %08X\n",
+ fcm->status, fcm->mdr, lbc->fmr);
+
+ /* if the operation completed ok then set the read
buffer pointers */
+ if (fcm->status == LTESR_CC) {
+ fcm->read_bytes = fcm->req_bytes;
+ fcm->index = fcm->req_index;
+ return 0;
+ }
+
+ return -1;
+}
+
+/*
+ * Set up the FCM hardware block and page address
fields, and the fcm
+ * structure addr field to point to the correct FCM
buffer in memory
+ */
+static void set_addr(struct mtd_info *mtd, int
column, int page_addr, int oob)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+ int buf_num;
+
+ fcm->page = page_addr;
+
+ lbc->fbar = page_addr >> (this->phys_erase_shift -
this->page_shift);
+ if (fcm->pgs) {
+ lbc->fpar = ((page_addr << FPAR_LP_PI_SHIFT) &
FPAR_LP_PI) |
+ ( oob ? FPAR_LP_MS : 0) |
+ column;
+ buf_num = (page_addr & 1) << 2;
+ } else {
+ lbc->fpar = ((page_addr << FPAR_SP_PI_SHIFT) &
FPAR_SP_PI) |
+ ( oob ? FPAR_SP_MS : 0) |
+ column;
+ buf_num = page_addr & 7;
+ }
+ fcm->addr = (unsigned char*)(fcm->base + (buf_num *
1024));
+
+ /* for OOB data point to the second half of the
buffer */
+ if (oob) {
+ fcm->addr += (fcm->pgs ? 2048 : 512);
+ }
+}
+
+/* not required for FCM */
+static void fcm_hwcontrol(struct mtd_info *mtdinfo,
int cmd)
+{
+ return;
+}
+
+
+/*
+ * FCM does not support 16 bit data busses
+ */
+static u16 fcm_read_word(struct mtd_info *mtd)
+{
+ printf("fcm_read_word: UNIMPLEMENTED.\n");
+ return 0;
+}
+static void fcm_write_word(struct mtd_info *mtd, u16
word)
+{
+ printf("fcm_write_word: UNIMPLEMENTED.\n");
+}
+
+/*
+ * Write buf to the FCM Controller Data Buffer
+ */
+static void fcm_write_buf(struct mtd_info *mtd, const
u_char *buf, int len)
+{
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+
+ FCM_DEBUG(3,"fcm_write_buf: writing %d bytes
starting with 0x%x"
+ " at %d.\n", len, *((unsigned long*) buf),
fcm->index);
+
+ /* If armed catch the address of the OOB buffer so
that it can be */
+ /* updated with the real signature after the program
comletes */
+ if (!fcm->oobbuf)
+ fcm->oobbuf = (int) buf;
+
+ /* copy the data into the FCM hardware buffer and
update the index */
+ memcpy(&(fcm->addr[fcm->index]), buf, len);
+ fcm->index += len;
+ return;
+}
+
+
+/*
+ * FCM does not support individual writes. Instead
these are either commands
+ * or data being written, both of which are handled
through the cmdfunc
+ * handler.
+ */
+static void fcm_write_byte(struct mtd_info *mtd,
u_char byte)
+{
+ printf("fcm_write_byte: UNIMPLEMENTED.\n");
+}
+
+/*
+ * read a byte from either the FCM hardware buffer if
it has any data left
+ * otherwise issue a command to read a single byte.
+ */
+static u_char fcm_read_byte(struct mtd_info *mtd)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+ unsigned char byte;
+
+ /* If there are still bytes in the FCM then use the
next byte */
+ if(fcm->index < fcm->read_bytes) {
+ byte = fcm->addr[(fcm->index)++];
+ FCM_DEBUG(4,"fcm_read_byte: byte %u (%02X): %d of
%d.\n",
+ byte, byte, fcm->index-1, fcm->read_bytes);
+ } else {
+ /* otherwise issue a command to read 1 byte */
+ lbc->fir = (FIR_OP_RSW << FIR_OP0_SHIFT);
+ fcm->use_mdr = 1;
+ fcm->read_bytes = 0;
+ fcm->index = 0;
+ fcm->req_bytes = 0;
+ fcm->req_index = 0;
+ byte = fcm_run_command(mtd) ? ERR_BYTE : fcm->mdr &
0xff;
+ FCM_DEBUG(4,"fcm_read_byte: byte %u (%02X) from
bus.\n",
+ byte, byte);
+ }
+
+ return byte;
+}
+
+
+/*
+ * Read from the FCM Controller Data Buffer
+ */
+static void fcm_read_buf(struct mtd_info *mtd,
u_char* buf, int len)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+ int i;
+ int rest;
+
+ FCM_DEBUG(3,"fcm_read_buf: reading %d bytes.\n",
len);
+
+ /* If last read failed then return error bytes */
+ if (fcm->status != LTESR_CC) {
+ /* just keep copying bytes so that the oob works */
+ memcpy(buf, &(fcm->addr[(fcm->index)]), len);
+ fcm->index += len;
+ }
+ else
+ {
+ /* see how much is still in the FCM buffer */
+ i = min(len, (fcm->read_bytes - fcm->index));
+ rest = i - len;
+ len = i;
+
+ memcpy(buf, &(fcm->addr[(fcm->index)]), len);
+ fcm->index += len;
+
+ /* If more data is needed then issue another block
read */
+ if (rest) {
+ FCM_DEBUG(3,"fcm_read_buf: getting %d more
bytes.\n",
+ rest);
+ buf += len;
+ lbc->fir = (FIR_OP_RBW << FIR_OP0_SHIFT);
+ set_addr(mtd, 0, 0, 0);
+ lbc->fbcr = rest;
+ fcm->req_bytes = lbc->fbcr;
+ fcm->req_index = 0;
+ fcm->use_mdr = 0;
+ if (!fcm_run_command(mtd))
+ fcm_read_buf(mtd, buf, rest);
+ else
+ memcpy(buf, fcm->addr, rest);
+ }
+ }
+ return;
+}
+
+
+/*
+ * Verify buffer against the FCM Controller Data
Buffer
+ */
+static int fcm_verify_buf(struct mtd_info *mtd, const
u_char *buf, int len)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+ int i;
+ int rest;
+
+ FCM_DEBUG(3,"fcm_verify_buf: checking %d bytes
starting with 0x%02x.\n",
+ len, *((unsigned long*) buf));
+ /* If last read failed then return error bytes */
+ if (fcm->status != LTESR_CC) {
+ return EFAULT;
+ }
+
+ /* see how much is still in the FCM buffer */
+ i = min(len, (fcm->read_bytes - fcm->index));
+ rest = i - len;
+ len = i;
+
+ if (memcmp(buf, &(fcm->addr[(fcm->index)]), len)) {
+ return EFAULT;
+ }
+
+ fcm->index += len;
+ if (rest) {
+ FCM_DEBUG(3,"fcm_verify_buf: getting %d more
bytes.\n", rest);
+ buf += len;
+ lbc->fir = (FIR_OP_RBW << FIR_OP0_SHIFT);
+ set_addr(mtd, 0, 0, 0);
+ lbc->fbcr = rest;
+ fcm->req_bytes = lbc->fbcr;
+ fcm->req_index = 0;
+ fcm->use_mdr = 0;
+ if (fcm_run_command(mtd))
+ return EFAULT;
+ return fcm_verify_buf(mtd, buf, rest);
+
+ }
+ return 0;
+}
+
+/* this function is called after Program and Erase
Operations to
+ * check for success or failure */
+static int fcm_wait(struct mtd_info *mtd, struct
nand_chip *this, int state)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ struct fcm_nand *fcm = this->priv;
+
+ if (fcm->status != LTESR_CC) {
+ return(0x1); /* Status Read error */
+ }
+
+ /* Use READ_STATUS command, but wait for the device
to be ready */
+ fcm->use_mdr = 0;
+ fcm->req_index = 0;
+ fcm->read_bytes = 0;
+ fcm->index = 0;
+ fcm->oobbuf = -1;
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_RBW << FIR_OP1_SHIFT);
+ lbc->fcr = (NAND_CMD_STATUS << FCR_CMD0_SHIFT);
+ set_addr(mtd, 0, 0, 0);
+ lbc->fbcr = 1;
+ fcm->req_bytes = lbc->fbcr;
+ fcm_run_command(mtd);
+ if (fcm->status != LTESR_CC) {
+ return(0x1); /* Status Read error */
+ }
+ return this->read_byte(mtd);
+}
+
+
+/* cmdfunc send commands to the FCM */
+static void fcm_cmdfunc(struct mtd_info *mtd,
unsigned command,
+ int column, int page_addr)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+
+ fcm->use_mdr = 0;
+ fcm->req_index = 0;
+
+ /* clear the read buffer */
+ fcm->read_bytes = 0;
+ if (command != NAND_CMD_PAGEPROG) {
+ fcm->index = 0;
+ fcm->oobbuf = -1;
+ }
+
+ switch (command) {
+ /* READ0 and READ1 read the entire buffer to use
hardware ECC */
+ case NAND_CMD_READ1:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_READ1,
page_addr:"
+ " 0x%x, column: 0x%x.\n", page_addr, column);
+ fcm->req_index = column + 256;
+ goto read0;
+ case NAND_CMD_READ0:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_READ0,
page_addr:"
+ " 0x%x, column: 0x%x.\n", page_addr, column);
+ fcm->req_index = column;
+read0:
+ if (fcm->pgs) {
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_CA << FIR_OP1_SHIFT) |
+ (FIR_OP_PA << FIR_OP2_SHIFT) |
+ (FIR_OP_CW1 << FIR_OP3_SHIFT) |
+ (FIR_OP_RBW << FIR_OP4_SHIFT);
+ } else {
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_CA << FIR_OP1_SHIFT) |
+ (FIR_OP_PA << FIR_OP2_SHIFT) |
+ (FIR_OP_RBW << FIR_OP3_SHIFT);
+ }
+ lbc->fcr = (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
+ (NAND_CMD_READSTART << FCR_CMD1_SHIFT);
+ lbc->fbcr = 0; /* read entire page to enable ECC */
+ set_addr(mtd, 0, page_addr, 0);
+ fcm->req_bytes = mtd->oobblock + mtd->oobsize;
+ goto write_cmd2;
+ /* READOOB read only the OOB becasue no ECC is
performed */
+ case NAND_CMD_READOOB:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_READOOB,
page_addr:"
+ " 0x%x, column: 0x%x.\n", page_addr, column);
+ if (fcm->pgs) {
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_CA << FIR_OP1_SHIFT) |
+ (FIR_OP_PA << FIR_OP2_SHIFT) |
+ (FIR_OP_CW1 << FIR_OP3_SHIFT) |
+ (FIR_OP_RBW << FIR_OP4_SHIFT);
+ lbc->fcr = (NAND_CMD_READ0 << FCR_CMD0_SHIFT)
|
+ (NAND_CMD_READSTART << FCR_CMD1_SHIFT);
+ } else {
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_CA << FIR_OP1_SHIFT) |
+ (FIR_OP_PA << FIR_OP2_SHIFT) |
+ (FIR_OP_RBW << FIR_OP3_SHIFT);
+ lbc->fcr = (NAND_CMD_READOOB << FCR_CMD0_SHIFT);
+ }
+ lbc->fbcr = mtd->oobsize - column;
+ set_addr(mtd, column, page_addr, 1);
+ goto write_cmd1;
+ /* READID must read all 5 possible bytes while CEB
is active */
+ case NAND_CMD_READID:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_READID.\n");
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_UA << FIR_OP1_SHIFT) |
+ (FIR_OP_RBW << FIR_OP2_SHIFT);
+ lbc->fcr = (NAND_CMD_READID << FCR_CMD0_SHIFT);
+ lbc->fbcr = 5; /* 5 bytes for manuf, device and
exts */
+ fcm->use_mdr = 1;
+ fcm->mdr = 0;
+ goto write_cmd0;
+ /* ERASE1 stores the block and page address */
+ case NAND_CMD_ERASE1:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_ERASE1,
page_addr:"
+ " 0x%x.\n", page_addr);
+ set_addr(mtd, 0, page_addr, 0);
+ goto end;
+ /* ERASE2 uses the block and page address from
ERASE1 */
+ case NAND_CMD_ERASE2:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_ERASE2.\n");
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_PA << FIR_OP1_SHIFT) |
+ (FIR_OP_CM1 << FIR_OP2_SHIFT);
+ lbc->fcr = (NAND_CMD_ERASE1 << FCR_CMD0_SHIFT) |
+ (NAND_CMD_ERASE2 << FCR_CMD1_SHIFT);
+ lbc->fbcr = 0;
+ goto write_cmd1;
+ /* SEQIN sets up the addr buffer and all registers
except the length */
+ case NAND_CMD_SEQIN:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG,
page_addr:"
+ " 0x%x, column: 0x%x.\n", page_addr, column);
+ if (column == 0) {
+ lbc->fbcr = 0; /* write entire page to enable ECC
*/
+ } else {
+ lbc->fbcr = 1; /* mark as partial page so no HW
ECC */
+ }
+ if (fcm->pgs) {
+ /* always use READ0 for large page devices */
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_CA << FIR_OP1_SHIFT) |
+ (FIR_OP_PA << FIR_OP2_SHIFT) |
+ (FIR_OP_WB << FIR_OP3_SHIFT) |
+ (FIR_OP_CW1 << FIR_OP4_SHIFT);
+ lbc->fcr = (NAND_CMD_SEQIN << FCR_CMD0_SHIFT) |
+ (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT);
+ set_addr(mtd, column, page_addr, 0);
+ } else {
+ lbc->fir = (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+ (FIR_OP_CM2 << FIR_OP1_SHIFT) |
+ (FIR_OP_CA << FIR_OP2_SHIFT) |
+ (FIR_OP_PA << FIR_OP3_SHIFT) |
+ (FIR_OP_WB << FIR_OP4_SHIFT) |
+ (FIR_OP_CW1 << FIR_OP5_SHIFT);
+ if (column >= mtd->oobblock) {
+ /* OOB area --> READOOB */
+ column -= mtd->oobblock;
+ lbc->fcr = (NAND_CMD_READOOB << FCR_CMD0_SHIFT)
+ | (NAND_CMD_PAGEPROG<< FCR_CMD1_SHIFT)
+ | (NAND_CMD_SEQIN << FCR_CMD2_SHIFT);
+ set_addr(mtd, column, page_addr, 1);
+ } else if (column < 256) {
+ /* First 256 bytes --> READ0 */
+ lbc->fcr = (NAND_CMD_READ0 << FCR_CMD0_SHIFT)
+ | (NAND_CMD_PAGEPROG<< FCR_CMD1_SHIFT)
+ | (NAND_CMD_SEQIN << FCR_CMD2_SHIFT);
+ set_addr(mtd, column, page_addr, 0);
+ } else {
+ /* Second 256 bytes --> READ1 */
+ column -= 256;
+ lbc->fcr = (NAND_CMD_READ1 << FCR_CMD0_SHIFT)
+ | (NAND_CMD_PAGEPROG<< FCR_CMD1_SHIFT)
+ | (NAND_CMD_SEQIN << FCR_CMD2_SHIFT);
+ set_addr(mtd, column, page_addr, 0);
+ }
+ }
+ goto end;
+ /* PAGEPROG reuses all of the setup from SEQIN and
adds the length */
+ case NAND_CMD_PAGEPROG:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_PAGEPROG"
+ " writing %d bytes.\n",fcm->index);
+ /* if the write did not start at 0 or is not a full
page */
+ /* then set the exact length, otherwise use a full
page */
+ /* write so the HW generates the ECC. */
+ if (lbc->fbcr ||
+ (fcm->index != (mtd->oobblock + mtd->oobsize)))
+ lbc->fbcr = fcm->index;
+ fcm->req_bytes = 0;
+ goto write_cmd2;
+ /* CMD_STATUS must read the status byte while CEB is
active */
+ /* Note - it does not wait for the ready line */
+ case NAND_CMD_STATUS:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_STATUS.\n");
+ lbc->fir = (FIR_OP_CM0 << FIR_OP0_SHIFT) |
+ (FIR_OP_RBW << FIR_OP1_SHIFT);
+ lbc->fcr = (NAND_CMD_STATUS << FCR_CMD0_SHIFT);
+ lbc->fbcr = 1;
+ goto write_cmd0;
+ /* RESET without waiting for the ready line */
+ case NAND_CMD_RESET:
+ FCM_DEBUG(2,"fcm_cmdfunc: NAND_CMD_RESET.\n");
+ lbc->fir = (FIR_OP_CM0 << FIR_OP0_SHIFT);
+ lbc->fcr = (NAND_CMD_RESET << FCR_CMD0_SHIFT);
+ lbc->fbcr = 0;
+ goto write_cmd0;
+ default:
+ printk("fcm_cmdfunc: error, unsupported
command.\n");
+ goto end;
+ }
+
+ /* Short cuts fall through to save code */
+ write_cmd0:
+ set_addr(mtd, 0, 0, 0);
+ write_cmd1:
+ fcm->req_bytes = lbc->fbcr;
+ write_cmd2:
+ fcm_run_command(mtd);
+
+#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+ /* if we wrote a page then read back the oob to get
the ECC */
+ if ((command == NAND_CMD_PAGEPROG) &&
+ (this->eccmode > NAND_ECC_SOFT) &&
+ (lbc->fbcr == 0) &&
+ (fcm->oobbuf != 0) &&
+ (fcm->oobbuf != -1)) {
+ int i;
+ uint *oob_config;
+ unsigned char *oob_buf;
+
+ i = fcm->page;
+ oob_buf = (unsigned char*) fcm->oobbuf;
+ oob_config = this->autooob->eccpos;
+
+ /* wait for the write to complete and check it
passed */
+ if (!(this->waitfunc(mtd, this, FL_WRITING) &
0x01)) {
+ /* read back the OOB */
+ fcm_cmdfunc(mtd, NAND_CMD_READOOB, 0, i);
+ /* if it succeeded then copy the ECC bytes */
+ if (fcm->status == LTESR_CC) {
+ for (i = 0; i < this->eccbytes; i++) {
+ oob_buf[oob_config[i]] =
+ fcm->addr[oob_config[i]];
+ }
+ }
+ }
+ }
+#endif
+
+ end:
+ return;
+}
+
+/*
+ * fcm_enable_hwecc - start ECC generation
+ */
+static void fcm_enable_hwecc(struct mtd_info *mtd,
int mode)
+{
+ return;
+}
+
+/*
+ * fcm_calculate_ecc - Calculate the ECC bytes
+ * This is done by hardware during the write process,
so we use this
+ * to arm the oob buf capture on the next write_buf()
call. The ECC bytes
+ * only need to be captured if
CONFIG_MTD_NAND_VERIFY_WRITE is defined which
+ * reads back the pages and checks they match the
data and oob buffers.
+ */
+static int fcm_calculate_ecc(struct mtd_info *mtd,
const u_char *dat, u_char *ecc_code)
+{
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+
+#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+ /* arm capture of oob buf ptr on next write_buf */
+ fcm->oobbuf = 0;
+#endif
+ return 0;
+}
+
+/*
+ * fcm_correct_data - Detect and correct bit error(s)
+ * The detection and correction is done automatically
by the hardware,
+ * if the complete page was read. If the status code
is okay then there
+ * was no error, otherwise we return an error code
indicating an uncorrectable
+ * error.
+ */
+static int fcm_correct_data(struct mtd_info *mtd,
u_char *dat, u_char *read_ecc, u_char *calc_ecc)
+{
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+
+ /* No errors */
+ if (fcm->status == LTESR_CC)
+ return 0;
+
+ return -1; /* uncorrectable error */
+}
+
+
+
+/*
+ * Dummy scan_bbt to complete setup of the FMR based
on NAND size
+ */
+static int fcm_scan_bbt (struct mtd_info *mtd)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ register struct nand_chip *this = mtd->priv;
+ struct fcm_nand *fcm = this->priv;
+ unsigned int i;
+ unsigned int al;
+
+ if (!fcm) {
+ printk (KERN_ERR "fcm_scan_bbt():" \
+ " Failed to allocate chip specific data
structure\n");
+ return -1;
+ }
+
+ /* calculate FMR Address Length field */
+ al = 0;
+ for (i = this->pagemask >> 16; i ; i >>= 8) {
+ al++;
+ }
+
+ /* add to ECCM mode set in fcm_init */
+ fcm->fmr |= 12 << FMR_CWTO_SHIFT | /* Timeout > 12
mSecs */
+ al << FMR_AL_SHIFT;
+
+ FCM_DEBUG(1,"fcm_init: nand->options = %08X\n",
this->options);
+ FCM_DEBUG(1,"fcm_init: nand->numchips = %10d\n",
this->numchips);
+ FCM_DEBUG(1,"fcm_init: nand->chipsize = %10d\n",
this->chipsize);
+ FCM_DEBUG(1,"fcm_init: nand->pagemask = %10X\n",
this->pagemask);
+ FCM_DEBUG(1,"fcm_init: nand->eccmode = %10d\n",
this->eccmode );
+ FCM_DEBUG(1,"fcm_init: nand->eccsize = %10d\n",
this->eccsize );
+ FCM_DEBUG(1,"fcm_init: nand->eccbytes = %10d\n",
this->eccbytes);
+ FCM_DEBUG(1,"fcm_init: nand->eccsteps = %10d\n",
this->eccsteps);
+ FCM_DEBUG(1,"fcm_init: nand->chip_delay = %8d\n",
this->chip_delay);
+ FCM_DEBUG(1,"fcm_init: nand->badblockpos = %7d\n",
this->badblockpos);
+ FCM_DEBUG(1,"fcm_init: nand->chip_shift = %8d\n",
this->chip_shift);
+ FCM_DEBUG(1,"fcm_init: nand->page_shift = %8d\n",
this->page_shift);
+ FCM_DEBUG(1,"fcm_init: nand->phys_erase_shift =
%2d\n",
+ this->phys_erase_shift);
+ FCM_DEBUG(1,"fcm_init: mtd->flags = %08X\n",
mtd->flags);
+ FCM_DEBUG(1,"fcm_init: mtd->size = %10d\n",
mtd->size);
+ FCM_DEBUG(1,"fcm_init: mtd->erasesize = %10d\n",
mtd->erasesize);
+ FCM_DEBUG(1,"fcm_init: mtd->oobblock = %10d\n",
mtd->oobblock);
+ FCM_DEBUG(1,"fcm_init: mtd->oobsize = %10d\n",
mtd->oobsize);
+ FCM_DEBUG(1,"fcm_init: mtd->oobavail = %10d\n",
mtd->oobavail);
+ FCM_DEBUG(1,"fcm_init: mtd->ecctype = %10d\n",
mtd->ecctype);
+ FCM_DEBUG(1,"fcm_init: mtd->eccsize = %10d\n",
mtd->eccsize);
+
+ /* adjust Option Register and ECC to match Flash
page size */
+ if (mtd->oobblock == 512)
+ lbc->bank[fcm->bank].or &= ~(OR_FCM_PGS);
+ else if (mtd->oobblock == 2048) {
+ lbc->bank[fcm->bank].or |= OR_FCM_PGS;
+ /* adjust ecc setup if needed */
+ if ( (lbc->bank[fcm->bank].br & BR_DECC) ==
BR_DECC_CHK_GEN) {
+ mtd->eccsize = 2048;
+ mtd->oobavail -= 9;
+ this->eccmode = NAND_ECC_HW12_2048;
+ this->eccsize = 2048;
+ this->eccbytes += 9;
+ this->eccsteps = 1;
+ this->autooob = (fcm->fmr & FMR_ECCM) ?
+ &fcm_oob_lp_eccm1 : &fcm_oob_lp_eccm0;
+ memcpy(&mtd->oobinfo, this->autooob,
+ sizeof(mtd->oobinfo));
+ }
+ }
+ else {
+ printf("fcm_init: page size %d is not supported\n",
+ mtd->oobblock);
+ return -1;
+ }
+ fcm->pgs =
(lbc->bank[fcm->bank].or>>OR_FCM_PGS_SHIFT) & 1;
+
+ if (al > 2) {
+ printf("fcm_init: %d address bytes is not
supported\n", al+2);
+ return -1;
+ }
+
+ /* restore default scan_bbt function and call it */
+ this->scan_bbt = nand_default_bbt;
+ return nand_default_bbt(mtd);
+}
+
+/*
+ * Board-specific NAND initialization. The following
members of the
+ * argument are board-specific (per
include/linux/mtd/nand_new.h):
+ * - IO_ADDR_R?: address to read the 8 I/O lines of
the flash device
+ * - IO_ADDR_W?: address to write the 8 I/O lines of
the flash device
+ * - hwcontrol: hardwarespecific function for
accesing control-lines
+ * - dev_ready: hardwarespecific function for
accesing device ready/busy line
+ * - enable_hwecc: function to enable (reset)
hardware ecc generator. Must
+ * only be provided if a hardware ECC is available
+ * - eccmode: mode of ecc, see defines
+ * - chip_delay: chip dependent delay for transfering
data from array to
+ * read regs (tR)
+ * - options: various chip options. They can partly
be set to inform
+ * nand_scan about special functionality. See the
defines for further
+ * explanation
+ * Members with a "?" were not set in the merged
testing-NAND branch,
+ * so they are not set here either.
+ */
+int board_nand_init(struct nand_chip *nand)
+{
+ volatile immap_t *im = (immap_t *) CFG_IMMR;
+ volatile lbus83xx_t *lbc= &im->lbus;
+ struct fcm_nand *fcm;
+ unsigned int bank;
+
+ /* Enable FCM detection of timeouts, ECC errors and
completion */
+ lbc->ltedr &= ~(LTESR_FCT | LTESR_PAR | LTESR_CC);
+
+ fcm = kmalloc (sizeof(struct fcm_nand), GFP_KERNEL);
+ if (!fcm) {
+ printk (KERN_ERR "board_nand_init():" \
+ " Cannot allocate read buffer data structure\n");
+ return -1;
+ }
+
+ /* Find which chip select bank is being used for
this device */
+ for (bank=0; bank<8; bank++) {
+ if ( (lbc->bank[bank].br & BR_V) &&
+ ( (lbc->bank[bank].br & BR_MSEL) == BR_MS_FCM )
&&
+ ( (lbc->bank[bank].br & BR_BA) ==
+ (lbc->bank[bank].or & OR_FCM_AM &
+ (unsigned int)(nand->IO_ADDR_R) ) ) ) {
+ fcm->bank = bank;
+ fcm->fmr = 0; /* rest filled in later */
+ fcm->read_bytes = 0;
+ fcm->index = 0;
+ fcm->pgs = (lbc->bank[bank].or>>OR_FCM_PGS_SHIFT)
& 1;
+ fcm->base = lbc->bank[bank].br & BR_BA;
+ fcm->addr = (unsigned char*) (fcm->base);
+ nand->priv = fcm;
+ fcm->oobbuf = -1;
+ break;
+ }
+ }
+
+ if (!nand->priv) {
+ printk (KERN_ERR "board_nand_init():" \
+ " Could not find matching Chip Select\n");
+ return -1;
+ }
+
+ /* set up nand options */
+ nand->options = 0;
+ /* set up function call table */
+ nand->hwcontrol = fcm_hwcontrol;
+ nand->waitfunc = fcm_wait;
+ nand->read_byte = fcm_read_byte;
+ nand->write_byte = fcm_write_byte;
+ nand->read_word = fcm_read_word;
+ nand->write_word = fcm_write_word;
+ nand->read_buf = fcm_read_buf;
+ nand->verify_buf = fcm_verify_buf;
+ nand->write_buf = fcm_write_buf;
+ nand->cmdfunc = fcm_cmdfunc;
+ nand->scan_bbt = fcm_scan_bbt;
+
+ /* If CS Base Register selects full hardware ECC
then use it */
+ if ( ( (lbc->bank[bank].br & BR_DECC) >>
BR_DECC_SHIFT) == 2) {
+ /* put in small page settings and adjust later if
needed */
+ nand->eccmode = NAND_ECC_HW3_512;
+ nand->autooob = (fcm->fmr & FMR_ECCM) ?
+ &fcm_oob_sp_eccm1 : &fcm_oob_sp_eccm0;
+ nand->calculate_ecc = fcm_calculate_ecc;
+ nand->correct_data = fcm_correct_data;
+ nand->enable_hwecc = fcm_enable_hwecc;
+ } else {
+ /* otherwise fall back to default software ECC */
+ nand->eccmode = NAND_ECC_SOFT;
+ }
+
+ return 0;
+}
+
+#endif
+#endif
diff --git a/board/sheldon/simpc8313/nand_ecc.c
b/board/sheldon/simpc8313/nand_ecc.c
new file mode 100644
index 0000000..87db359
--- /dev/null
+++ b/board/sheldon/simpc8313/nand_ecc.c
@@ -0,0 +1,214 @@
+/*
+ * This file was copied from drivers/nand/nand_ecc.c
and optimized to reduce
+ * the memory size and function calls to correct up
to 1 bit error in each
+ * 256 byte block of data.
+ *
+ * Copyright (C) 2006, Freescale Semiconductor
+ *
+ * Copyright (C) 2000-2004 Steven J. Hill
(sjhill at realitydiluted.com)
+ * Toshiba America
Electronics Components, Inc.
+ *
+ * This file 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 or (at
your option) any
+ * later version.
+ *
+ * This file is distributed in the hope that it will
be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General
Public License along
+ * with this file; if not, write to the Free Software
Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
+ *
+ * As a special exception, if other files instantiate
templates or use
+ * macros or inline functions from these files, or
you compile these
+ * files and link them with other works to produce a
work based on these
+ * files, these files do not by themselves cause the
resulting work to be
+ * covered by the GNU General Public License. However
the source code for
+ * these files must still be made available in
accordance with section (3)
+ * of the GNU General Public License.
+ *
+ * This exception does not invalidate any other
reasons why a work based on
+ * this file might be covered by the GNU General
Public License.
+ */
+
+#include <common.h>
+
+/*
+ * Pre-calculated 256-way 1 byte column parity
+ */
+static const u_char nand_ecc_precalc_table[] = {
+ 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a,
0x5a, 0x0f, 0x0c, 0x59,
+ 0x03, 0x56, 0x55, 0x00,
+ 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f,
0x3f, 0x6a, 0x69, 0x3c,
+ 0x66, 0x33, 0x30, 0x65,
+ 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c,
0x3c, 0x69, 0x6a, 0x3f,
+ 0x65, 0x30, 0x33, 0x66,
+ 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59,
0x59, 0x0c, 0x0f, 0x5a,
+ 0x00, 0x55, 0x56, 0x03,
+ 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33,
0x33, 0x66, 0x65, 0x30,
+ 0x6a, 0x3f, 0x3c, 0x69,
+ 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56,
0x56, 0x03, 0x00, 0x55,
+ 0x0f, 0x5a, 0x59, 0x0c,
+ 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55,
0x55, 0x00, 0x03, 0x56,
+ 0x0c, 0x59, 0x5a, 0x0f,
+ 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30,
0x30, 0x65, 0x66, 0x33,
+ 0x69, 0x3c, 0x3f, 0x6a,
+ 0x6a, 0x3f, 0x3c, 0x69, 0x33, 0x66, 0x65, 0x30,
0x30, 0x65, 0x66, 0x33,
+ 0x69, 0x3c, 0x3f, 0x6a,
+ 0x0f, 0x5a, 0x59, 0x0c, 0x56, 0x03, 0x00, 0x55,
0x55, 0x00, 0x03, 0x56,
+ 0x0c, 0x59, 0x5a, 0x0f,
+ 0x0c, 0x59, 0x5a, 0x0f, 0x55, 0x00, 0x03, 0x56,
0x56, 0x03, 0x00, 0x55,
+ 0x0f, 0x5a, 0x59, 0x0c,
+ 0x69, 0x3c, 0x3f, 0x6a, 0x30, 0x65, 0x66, 0x33,
0x33, 0x66, 0x65, 0x30,
+ 0x6a, 0x3f, 0x3c, 0x69,
+ 0x03, 0x56, 0x55, 0x00, 0x5a, 0x0f, 0x0c, 0x59,
0x59, 0x0c, 0x0f, 0x5a,
+ 0x00, 0x55, 0x56, 0x03,
+ 0x66, 0x33, 0x30, 0x65, 0x3f, 0x6a, 0x69, 0x3c,
0x3c, 0x69, 0x6a, 0x3f,
+ 0x65, 0x30, 0x33, 0x66,
+ 0x65, 0x30, 0x33, 0x66, 0x3c, 0x69, 0x6a, 0x3f,
0x3f, 0x6a, 0x69, 0x3c,
+ 0x66, 0x33, 0x30, 0x65,
+ 0x00, 0x55, 0x56, 0x03, 0x59, 0x0c, 0x0f, 0x5a,
0x5a, 0x0f, 0x0c, 0x59,
+ 0x03, 0x56, 0x55, 0x00
+};
+
+/**
+ * nand_correct_data - [NAND Interface] Detect and
correct bit error(s)
+ * @dat: raw data read from the chip
+ * @ecc_pos: ecc byte offsets (3 bytes per 512 data
byte block)
+ * @blocks: Number of 512 byte blocks to be processed
+ *
+ * Detect and / or correct 1 bit error per 256 byte
block
+ */
+int nand_correct_data (u_char * dat, const u_char *
ecc_pos, int blocks)
+{
+ u_char tmp1, tmp2;
+ u_char a, b, c, d1, d2, d3, add, bit, i;
+ u_char idx, reg1, reg2, reg3;
+ int j, ctr, ret;
+ u_char *ecc;
+
+ ecc = dat + CFG_NAND_PAGE_SIZE;
+ ctr = 0;
+ while (blocks--) {
+
+ /* Initialize variables */
+ ret = reg1 = reg2 = reg3 = 0;
+
+ /* Build up column parity */
+ for (j = 0; j < 256; j++) {
+
+ /* Get CP0 - CP5 from table */
+ idx = nand_ecc_precalc_table[dat[j]];
+ reg1 ^= (idx & 0x3f);
+
+ /* All bit XOR = 1 ? */
+ if (idx & 0x40) {
+ reg3 ^= (u_char) j;
+ reg2 ^= ~((u_char) j);
+ }
+ }
+
+ /* Create non-inverted ECC code from line parity */
+
+ /* Initialize variables */
+ a = b = c = 0x80;
+ tmp1 = tmp2 = 0;
+
+ /* Calculate first ECC byte */
+ for (i = 0; i < 4; i++) {
+ if (reg3 & a) /* LP15,13,11,9 --> ecc_code[0] */
+ tmp1 |= b;
+ b >>= 1;
+ if (reg2 & a) /* LP14,12,10,8 --> ecc_code[0] */
+ tmp1 |= b;
+ b >>= 1;
+ a >>= 1;
+ }
+
+ /* Calculate second ECC byte */
+ for (i = 0; i < 4; i++) {
+ if (reg3 & a) /* LP7,5,3,1 --> ecc_code[1] */
+ tmp2 |= c;
+ c >>= 1;
+ if (reg2 & a) /* LP6,4,2,0 --> ecc_code[1] */
+ tmp2 |= c;
+ c >>= 1;
+ a >>= 1;
+ }
+
+ /* Calculate final ECC code */
+ /* Do error detection */
+ d1 = (~tmp1) ^ ecc[*(ecc_pos++)];
+ d2 = (~tmp2) ^ ecc[*(ecc_pos++)];
+ d3 = (((~reg1) << 2) | 0x03) ^ ecc[*(ecc_pos++)];
+
+ if ((d1 | d2 | d3) != 0) {
+ /* 1 or more errors detected */
+ a = (d1 ^ (d1 >> 1)) & 0x55;
+ b = (d2 ^ (d2 >> 1)) & 0x55;
+ c = (d3 ^ (d3 >> 1)) & 0x54;
+
+ /* Found and correct single bit error in the data
*/
+ if ((a == 0x55) && (b == 0x55) && (c == 0x54)) {
+ a = b = c = 0x80;
+ add = 0;
+ for (i = 0; i < 4; i++) {
+ if (d1 & b)
+ add |= a;
+ b >>= 2;
+ a >>= 1;
+ }
+ for (i = 0; i < 4; i++) {
+ if (d2 & c)
+ add |= a;
+ c >>= 2;
+ a >>= 1;
+ }
+ bit = 0;
+ b = 0x04;
+ c = 0x80;
+ for (i = 0; i < 3; i++) {
+ if (d3 & c)
+ bit |= b;
+ c >>= 2;
+ b >>= 1;
+ }
+ b = 0x01;
+ a = dat[add];
+ a ^= (b << bit);
+ dat[add] = a;
+ ret = 1;
+ } else {
+ while (d1) {
+ if (d1 & 0x01)
+ ret++;
+ d1 >>= 1;
+ }
+ while (d2) {
+ if (d2 & 0x01)
+ ret++;
+ d2 >>= 1;
+ }
+ while (d3) {
+ if (d3 & 0x01)
+ ret++;
+ d3 >>= 1;
+ }
+ }
+ }
+
+ /* this page had more than 1 error so it is
uncorrectable */
+ if (ret > 1)
+ return -1;
+
+ /* advance to the next page */
+ dat += 256;
+ ctr += ret;
+ }
+
+ /* return number of ECC errors that we corrected */
+ return ctr;
+}
--
1.5.5.1
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