diff options
Diffstat (limited to 'nand_spl')
| -rw-r--r-- | nand_spl/nand_boot_fsl_nfc.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/nand_spl/nand_boot_fsl_nfc.c b/nand_spl/nand_boot_fsl_nfc.c new file mode 100644 index 0000000..a9df2a8 --- /dev/null +++ b/nand_spl/nand_boot_fsl_nfc.c @@ -0,0 +1,259 @@ +/* + * (C) Copyright 2009 + * Magnus Lilja <lilja.magnus@gmail.com> + * + * (C) Copyright 2008 + * Maxim Artamonov, <scn1874 at yandex.ru> + * + * (C) Copyright 2006-2008 + * Stefan Roese, DENX Software Engineering, sr at 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> +#include <asm-arm/arch/mx31-regs.h> +#include <asm/io.h> +#include <fsl_nfc.h> + +static struct fsl_nfc_regs *nfc; + +static void nfc_wait_ready(void) +{ + uint32_t tmp; + + while (!(readw(&nfc->nand_flash_config2) & NFC_INT)) + ; + + /* Reset interrupt flag */ + tmp = readw(&nfc->nand_flash_config2); + tmp &= ~NFC_INT; + writew(tmp, &nfc->nand_flash_config2); +} + +static void nfc_nand_init(void) +{ + /* unlocking RAM Buff */ + writew(0x2, &nfc->configuration); + + /* hardware ECC checking and correct */ + writew(NFC_ECC_EN, &nfc->nand_flash_config1); +} + +static void nfc_nand_command(unsigned short command) +{ + writew(command, &nfc->flash_cmd); + writew(NFC_CMD, &nfc->nand_flash_config2); + nfc_wait_ready(); +} + +static void nfc_nand_page_address(unsigned int page_address) +{ + unsigned int page_count; + + writew(0x00, &nfc->flash_cmd); + writew(NFC_ADDR, &nfc->nand_flash_config2); + nfc_wait_ready(); + + /* code only for 2kb flash */ + if (CONFIG_SYS_NAND_PAGE_SIZE == 0x800) { + writew(0x00, &nfc->flash_add); + writew(NFC_ADDR, &nfc->nand_flash_config2); + nfc_wait_ready(); + } + + page_count = CONFIG_SYS_NAND_SIZE / CONFIG_SYS_NAND_PAGE_SIZE; + + if (page_address <= page_count) { + page_count--; /* transform 0x01000000 to 0x00ffffff */ + do { + writew(page_address & 0xff, &nfc->flash_add); + writew(NFC_ADDR, &nfc->nand_flash_config2); + nfc_wait_ready(); + page_address = page_address >> 8; + page_count = page_count >> 8; + } while (page_count); + } +} + +static void nfc_nand_data_output(void) +{ + int i; + + /* + * The NAND controller requires four output commands for + * large page devices. + */ + for (i = 0; i < (CONFIG_SYS_NAND_PAGE_SIZE / 512); i++) { + writew(NFC_ECC_EN, &nfc->nand_flash_config1); + writew(i, &nfc->buffer_address); /* read in i:th buffer */ + writew(NFC_OUTPUT, &nfc->nand_flash_config2); + nfc_wait_ready(); + } +} + +static int nfc_nand_check_ecc(void) +{ + return readw(&nfc->ecc_status_result); +} + +static int nfc_read_page(unsigned int page_address, unsigned char *buf) +{ + int i; + u32 *src; + u32 *dst; + + writew(0, &nfc->buffer_address); /* read in first 0 buffer */ + nfc_nand_command(NAND_CMD_READ0); + nfc_nand_page_address(page_address); + + if (CONFIG_SYS_NAND_PAGE_SIZE == 0x800) + nfc_nand_command(NAND_CMD_READSTART); + + nfc_nand_data_output(); /* fill the main buffer 0 */ + + if (nfc_nand_check_ecc()) + return -1; + + src = &nfc->main_area0[0]; + dst = (u32 *)buf; + + /* main copy loop from NAND-buffer to SDRAM memory */ + for (i = 0; i < (CONFIG_SYS_NAND_PAGE_SIZE / 4); i++) { + writel(readl(src), dst); + src++; + dst++; + } + + return 0; +} + +static int is_badblock(int pagenumber) +{ + int page = pagenumber; + u32 badblock; + u32 *src; + + /* Check the first two pages for bad block markers */ + for (page = pagenumber; page < pagenumber + 2; page++) { + writew(0, &nfc->buffer_address); /* read in first 0 buffer */ + nfc_nand_command(NAND_CMD_READ0); + nfc_nand_page_address(page); + + if (CONFIG_SYS_NAND_PAGE_SIZE == 0x800) + nfc_nand_command(NAND_CMD_READSTART); + + nfc_nand_data_output(); /* fill the main buffer 0 */ + + src = &nfc->spare_area0[0]; + + /* + * IMPORTANT NOTE: The nand flash controller uses a non- + * standard layout for large page devices. This can + * affect the position of the bad block marker. + */ + /* Get the bad block marker */ + badblock = readl(&src[CONFIG_SYS_NAND_BAD_BLOCK_POS / 4]); + badblock >>= 8 * (CONFIG_SYS_NAND_BAD_BLOCK_POS % 4); + badblock &= 0xff; + + /* bad block marker verify */ + if (badblock != 0xff) + return 1; /* potential bad block */ + } + + return 0; +} + +static int nand_load(unsigned int from, unsigned int size, unsigned char *buf) +{ + int i; + unsigned int page; + unsigned int maxpages = CONFIG_SYS_NAND_SIZE / + CONFIG_SYS_NAND_PAGE_SIZE; + + nfc = (void *)NFC_BASE_ADDR; + + nfc_nand_init(); + + /* Convert to page number */ + page = from / CONFIG_SYS_NAND_PAGE_SIZE; + i = 0; + + while (i < (size / CONFIG_SYS_NAND_PAGE_SIZE)) { + if (nfc_read_page(page, buf) < 0) + return -1; + + page++; + i++; + buf = buf + CONFIG_SYS_NAND_PAGE_SIZE; + + /* + * Check if we have crossed a block boundary, and if so + * check for bad block. + */ + if (!(page % CONFIG_SYS_NAND_PAGE_COUNT)) { + /* + * Yes, new block. See if this block is good. If not, + * loop until we find i good block. + */ + while (is_badblock(page)) { + page = page + CONFIG_SYS_NAND_PAGE_COUNT; + /* Check i we've reached the end of flash. */ + if (page >= maxpages) + return -1; + } + } + } + + 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) +{ + __attribute__((noreturn)) void (*uboot)(void); + + nfc = (void *)NFC_BASE_ADDR; + + /* + * CONFIG_SYS_NAND_U_BOOT_OFFS and CONFIG_SYS_NAND_U_BOOT_SIZE must + * be aligned to full pages + */ + if (!nand_load(CONFIG_SYS_NAND_U_BOOT_OFFS, CONFIG_SYS_NAND_U_BOOT_SIZE, + (uchar *)CONFIG_SYS_NAND_U_BOOT_DST)) { + /* Copy from NAND successful, start U-boot */ + uboot = (void *)CONFIG_SYS_NAND_U_BOOT_START; + uboot(); + } else { + /* Unrecoverable error when copying from NAND */ + hang(); + } +} + +/* + * Called in case of an exception. + */ +void hang(void) +{ + /* Loop forever */ + while (1) ; +} |