/*
- * (C) Copyright 2006
+ * (C) Copyright 2006-2008
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* This program is free software; you can redistribute it and/or
#include <common.h>
#include <nand.h>
+#include <asm/io.h>
#define CFG_NAND_READ_DELAY \
{ volatile int dummy; int i; for (i=0; i<10000; i++) dummy = i; }
+static int nand_ecc_pos[] = CFG_NAND_ECCPOS;
+
extern void board_nand_init(struct nand_chip *nand);
-extern void ndfc_hwcontrol(struct mtd_info *mtdinfo, int cmd);
-extern void ndfc_write_byte(struct mtd_info *mtdinfo, u_char byte);
-extern u_char ndfc_read_byte(struct mtd_info *mtdinfo);
-extern int ndfc_dev_ready(struct mtd_info *mtdinfo);
-extern int jump_to_ram(ulong delta);
-extern int jump_to_uboot(ulong addr);
-static int nand_is_bad_block(struct mtd_info *mtd, int block)
+#if (CFG_NAND_PAGE_SIZE <= 512)
+/*
+ * NAND command for small page NAND devices (512)
+ */
+static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
{
- struct nand_chip *this = mtd->priv;
- int page_addr = block * CFG_NAND_PAGE_COUNT;
+ struct nand_chip *this = mtd->priv;
+ int page_addr = page + block * CFG_NAND_PAGE_COUNT;
+
+ if (this->dev_ready)
+ while (!this->dev_ready(mtd))
+ ;
+ else
+ CFG_NAND_READ_DELAY;
/* Begin command latch cycle */
- this->hwcontrol(mtd, NAND_CTL_SETCLE);
- this->write_byte(mtd, NAND_CMD_READOOB);
+ this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
/* Set ALE and clear CLE to start address cycle */
- this->hwcontrol(mtd, NAND_CTL_CLRCLE);
- this->hwcontrol(mtd, NAND_CTL_SETALE);
/* Column address */
- this->write_byte(mtd, CFG_NAND_BAD_BLOCK_POS); /* A[7:0] */
- this->write_byte(mtd, (uchar)(page_addr & 0xff)); /* A[16:9] */
- this->write_byte(mtd, (uchar)((page_addr >> 8) & 0xff)); /* A[24:17] */
+ this->cmd_ctrl(mtd, offs, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
+ this->cmd_ctrl(mtd, page_addr & 0xff, 0); /* A[16:9] */
+ this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff, 0); /* A[24:17] */
#ifdef CFG_NAND_4_ADDR_CYCLE
/* One more address cycle for devices > 32MiB */
- this->write_byte(mtd, (uchar)((page_addr >> 16) & 0x0f)); /* A[xx:25] */
+ this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, 0); /* A[28:25] */
#endif
/* Latch in address */
- this->hwcontrol(mtd, NAND_CTL_CLRALE);
+ this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
/*
* Wait a while for the data to be ready
*/
if (this->dev_ready)
- this->dev_ready(mtd);
+ while (!this->dev_ready(mtd))
+ ;
else
CFG_NAND_READ_DELAY;
- /*
- * Read on byte
- */
- if (this->read_byte(mtd) != 0xff)
- return 1;
-
return 0;
}
-
-static int nand_read_page(struct mtd_info *mtd, int block, int page, uchar *dst)
+#else
+/*
+ * NAND command for large page NAND devices (2k)
+ */
+static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 cmd)
{
- struct nand_chip *this = mtd->priv;
+ struct nand_chip *this = mtd->priv;
int page_addr = page + block * CFG_NAND_PAGE_COUNT;
- int i;
+
+ if (this->dev_ready)
+ while (!this->dev_ready(mtd))
+ ;
+ else
+ CFG_NAND_READ_DELAY;
+
+ /* Emulate NAND_CMD_READOOB */
+ if (cmd == NAND_CMD_READOOB) {
+ offs += CFG_NAND_PAGE_SIZE;
+ cmd = NAND_CMD_READ0;
+ }
/* Begin command latch cycle */
- this->hwcontrol(mtd, NAND_CTL_SETCLE);
- this->write_byte(mtd, NAND_CMD_READ0);
+ this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
/* Set ALE and clear CLE to start address cycle */
- this->hwcontrol(mtd, NAND_CTL_CLRCLE);
- this->hwcontrol(mtd, NAND_CTL_SETALE);
/* Column address */
- this->write_byte(mtd, 0); /* A[7:0] */
- this->write_byte(mtd, (uchar)(page_addr & 0xff)); /* A[16:9] */
- this->write_byte(mtd, (uchar)((page_addr >> 8) & 0xff)); /* A[24:17] */
-#ifdef CFG_NAND_4_ADDR_CYCLE
- /* One more address cycle for devices > 32MiB */
- this->write_byte(mtd, (uchar)((page_addr >> 16) & 0x0f)); /* A[xx:25] */
+ this->cmd_ctrl(mtd, offs & 0xff,
+ NAND_CTRL_ALE | NAND_CTRL_CHANGE); /* A[7:0] */
+ this->cmd_ctrl(mtd, (offs >> 8) & 0xff, 0); /* A[11:9] */
+ /* Row address */
+ this->cmd_ctrl(mtd, (page_addr & 0xff), 0); /* A[19:12] */
+ this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff), 0); /* A[27:20] */
+#ifdef CFG_NAND_5_ADDR_CYCLE
+ /* One more address cycle for devices > 128MiB */
+ this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, 0); /* A[31:28] */
#endif
/* Latch in address */
- this->hwcontrol(mtd, NAND_CTL_CLRALE);
+ this->cmd_ctrl(mtd, NAND_CMD_READSTART,
+ NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+ this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
/*
* Wait a while for the data to be ready
*/
if (this->dev_ready)
- this->dev_ready(mtd);
+ while (!this->dev_ready(mtd))
+ ;
else
CFG_NAND_READ_DELAY;
+ return 0;
+}
+#endif
+
+static int nand_is_bad_block(struct mtd_info *mtd, int block)
+{
+ struct nand_chip *this = mtd->priv;
+
+ nand_command(mtd, block, 0, CFG_NAND_BAD_BLOCK_POS, NAND_CMD_READOOB);
+
/*
- * Read page into buffer
+ * Read one byte
*/
- for (i=0; i<CFG_NAND_PAGE_SIZE; i++)
- *dst++ = this->read_byte(mtd);
+ if (readb(this->IO_ADDR_R) != 0xff)
+ return 1;
return 0;
}
-static int nand_load(struct mtd_info *mtd, int offs, int uboot_size, uchar *dst)
+static int nand_read_page(struct mtd_info *mtd, int block, int page, uchar *dst)
{
- int block;
- int blockcopy_count;
- int page;
+ struct nand_chip *this = mtd->priv;
+ u_char *ecc_calc;
+ u_char *ecc_code;
+ u_char *oob_data;
+ int i;
+ int eccsize = CFG_NAND_ECCSIZE;
+ int eccbytes = CFG_NAND_ECCBYTES;
+ int eccsteps = CFG_NAND_ECCSTEPS;
+ uint8_t *p = dst;
+ int stat;
+
+ nand_command(mtd, block, page, 0, NAND_CMD_READ0);
+
+ /* No malloc available for now, just use some temporary locations
+ * in SDRAM
+ */
+ ecc_calc = (u_char *)(CFG_SDRAM_BASE + 0x10000);
+ ecc_code = ecc_calc + 0x100;
+ oob_data = ecc_calc + 0x200;
+
+ for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ this->ecc.hwctl(mtd, NAND_ECC_READ);
+ this->read_buf(mtd, p, eccsize);
+ this->ecc.calculate(mtd, p, &ecc_calc[i]);
+ }
+ this->read_buf(mtd, oob_data, CFG_NAND_OOBSIZE);
+
+ /* Pick the ECC bytes out of the oob data */
+ for (i = 0; i < CFG_NAND_ECCTOTAL; i++)
+ ecc_code[i] = oob_data[nand_ecc_pos[i]];
+
+ eccsteps = CFG_NAND_ECCSTEPS;
+ p = dst;
+
+ for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ /* No chance to do something with the possible error message
+ * from correct_data(). We just hope that all possible errors
+ * are corrected by this routine.
+ */
+ stat = this->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
+ }
+
+ return 0;
+}
+
+static int nand_load(struct mtd_info *mtd, unsigned int offs,
+ unsigned int uboot_size, uchar *dst)
+{
+ unsigned int block, lastblock;
+ unsigned int page;
/*
- * offs has to be aligned to a block address!
+ * offs has to be aligned to a page address!
*/
block = offs / CFG_NAND_BLOCK_SIZE;
- blockcopy_count = 0;
+ lastblock = (offs + uboot_size - 1) / CFG_NAND_BLOCK_SIZE;
+ page = (offs % CFG_NAND_BLOCK_SIZE) / CFG_NAND_PAGE_SIZE;
- while (blockcopy_count < (uboot_size / CFG_NAND_BLOCK_SIZE)) {
+ while (block <= lastblock) {
if (!nand_is_bad_block(mtd, block)) {
/*
* Skip bad blocks
*/
- for (page = 0; page < CFG_NAND_PAGE_COUNT; page++) {
+ while (page < CFG_NAND_PAGE_COUNT) {
nand_read_page(mtd, block, page, dst);
dst += CFG_NAND_PAGE_SIZE;
+ page++;
}
- blockcopy_count++;
+ page = 0;
+ } else {
+ lastblock++;
}
block++;
return 0;
}
+/*
+ * The main entry for NAND booting. It's necessary that SDRAM is already
+ * configured and available since this code loads the main U-Boot image
+ * from NAND into SDRAM and starts it from there.
+ */
void nand_boot(void)
{
- ulong mem_size;
struct nand_chip nand_chip;
nand_info_t nand_info;
int ret;
- void (*uboot)(void);
-
- /*
- * Init sdram, so we have access to memory
- */
- mem_size = initdram(0);
+ __attribute__((noreturn)) void (*uboot)(void);
/*
* Init board specific nand support
nand_chip.dev_ready = NULL; /* preset to NULL */
board_nand_init(&nand_chip);
+ if (nand_chip.select_chip)
+ nand_chip.select_chip(&nand_info, 0);
+
/*
* Load U-Boot image from NAND into RAM
*/
- ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS,
- CFG_NAND_U_BOOT_SIZE,
+ ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE,
(uchar *)CFG_NAND_U_BOOT_DST);
+ if (nand_chip.select_chip)
+ nand_chip.select_chip(&nand_info, -1);
+
/*
* Jump to U-Boot image
*/
- uboot = (void (*)(void))CFG_NAND_U_BOOT_START;
+ uboot = (void *)CFG_NAND_U_BOOT_START;
(*uboot)();
}
projects / u-boot / blobdiff