/* * (C) Copyright 2006-2008 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * 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> #include <nand.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); #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 = page + block * CFG_NAND_PAGE_COUNT; if (this->dev_ready) this->dev_ready(mtd); else CFG_NAND_READ_DELAY; /* Begin command latch cycle */ this->hwcontrol(mtd, NAND_CTL_SETCLE); this->write_byte(mtd, cmd); /* 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, offs); /* 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] */ #endif /* Latch in address */ this->hwcontrol(mtd, NAND_CTL_CLRALE); /* * Wait a while for the data to be ready */ if (this->dev_ready) this->dev_ready(mtd); else CFG_NAND_READ_DELAY; return 0; } #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; int page_offs = offs; int page_addr = page + block * CFG_NAND_PAGE_COUNT; if (this->dev_ready) this->dev_ready(mtd); else CFG_NAND_READ_DELAY; /* Emulate NAND_CMD_READOOB */ if (cmd == NAND_CMD_READOOB) { page_offs += CFG_NAND_PAGE_SIZE; cmd = NAND_CMD_READ0; } /* Begin command latch cycle */ this->hwcontrol(mtd, NAND_CTL_SETCLE); this->write_byte(mtd, cmd); /* 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, page_offs & 0xff); /* A[7:0] */ this->write_byte(mtd, (uchar)((page_offs >> 8) & 0xff)); /* A[11:9] */ /* Row address */ this->write_byte(mtd, (uchar)(page_addr & 0xff)); /* A[19:12] */ this->write_byte(mtd, (uchar)((page_addr >> 8) & 0xff)); /* A[27:20] */ #ifdef CFG_NAND_5_ADDR_CYCLE /* One more address cycle for devices > 128MiB */ this->write_byte(mtd, (uchar)((page_addr >> 16) & 0x0f)); /* A[xx:28] */ #endif /* Latch in address */ this->hwcontrol(mtd, NAND_CTL_CLRALE); /* Begin command latch cycle */ this->hwcontrol(mtd, NAND_CTL_SETCLE); /* Write out the start read command */ this->write_byte(mtd, NAND_CMD_READSTART); /* End command latch cycle */ this->hwcontrol(mtd, NAND_CTL_CLRCLE); /* * Wait a while for the data to be ready */ if (this->dev_ready) 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 one 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) { 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->enable_hwecc(mtd, NAND_ECC_READ); this->read_buf(mtd, p, eccsize); this->calculate_ecc(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->correct_data(mtd, p, &ecc_code[i], &ecc_calc[i]); } return 0; } static int nand_load(struct mtd_info *mtd, int offs, int uboot_size, uchar *dst) { int block; int blockcopy_count; int page; /* * offs has to be aligned to a block address! */ block = offs / CFG_NAND_BLOCK_SIZE; blockcopy_count = 0; while (blockcopy_count < (uboot_size / CFG_NAND_BLOCK_SIZE)) { if (!nand_is_bad_block(mtd, block)) { /* * Skip bad blocks */ for (page = 0; page < CFG_NAND_PAGE_COUNT; page++) { nand_read_page(mtd, block, page, dst); dst += CFG_NAND_PAGE_SIZE; } blockcopy_count++; } 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) { struct nand_chip nand_chip; nand_info_t nand_info; int ret; void (*uboot)(void); /* * Init board specific nand support */ nand_info.priv = &nand_chip; nand_chip.IO_ADDR_R = nand_chip.IO_ADDR_W = (void __iomem *)CFG_NAND_BASE; nand_chip.dev_ready = NULL; /* preset to NULL */ board_nand_init(&nand_chip); /* * Load U-Boot image from NAND into RAM */ ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE, (uchar *)CFG_NAND_U_BOOT_DST); /* * Jump to U-Boot image */ uboot = (void (*)(void))CFG_NAND_U_BOOT_START; (*uboot)(); }