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Diffstat (limited to 'board/bf537-stamp/nand.c')
| -rw-r--r-- | board/bf537-stamp/nand.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/board/bf537-stamp/nand.c b/board/bf537-stamp/nand.c new file mode 100644 index 0000000..4d6e776 --- /dev/null +++ b/board/bf537-stamp/nand.c @@ -0,0 +1,106 @@ +/* + * (C) Copyright 2006 Aubrey.Li, aubrey.li@analog.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> +#include <asm/io.h> + +#if (CONFIG_COMMANDS & CFG_CMD_NAND) + +#include <nand.h> + +#define CONCAT(a,b,c,d) a ## b ## c ## d +#define PORT(a,b) CONCAT(pPORT,a,b,) + +#ifndef CONFIG_NAND_GPIO_PORT +#define CONFIG_NAND_GPIO_PORT F +#endif + +/* + * hardware specific access to control-lines + */ +static void bfin_hwcontrol(struct mtd_info *mtd, int cmd) +{ + register struct nand_chip *this = mtd->priv; + + switch (cmd) { + + case NAND_CTL_SETCLE: + this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_CLE; + break; + case NAND_CTL_CLRCLE: + this->IO_ADDR_W = CFG_NAND_BASE; + break; + + case NAND_CTL_SETALE: + this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_ALE; + break; + case NAND_CTL_CLRALE: + this->IO_ADDR_W = CFG_NAND_BASE; + break; + case NAND_CTL_SETNCE: + case NAND_CTL_CLRNCE: + break; + } + + this->IO_ADDR_R = this->IO_ADDR_W; + + /* Drain the writebuffer */ + sync(); +} + +int bfin_device_ready(struct mtd_info *mtd) +{ + int ret = (*PORT(CONFIG_NAND_GPIO_PORT, IO) & BFIN_NAND_READY) ? 1 : 0; + sync(); + return ret; +} + +/* + * Board-specific NAND initialization. The following members of the + * argument are board-specific (per include/linux/mtd/nand.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. + */ +void board_nand_init(struct nand_chip *nand) +{ + *PORT(CONFIG_NAND_GPIO_PORT, _FER) &= ~BFIN_NAND_READY; + *PORT(CONFIG_NAND_GPIO_PORT, IO_DIR) &= ~BFIN_NAND_READY; + *PORT(CONFIG_NAND_GPIO_PORT, IO_INEN) |= BFIN_NAND_READY; + + nand->hwcontrol = bfin_hwcontrol; + nand->eccmode = NAND_ECC_SOFT; + nand->dev_ready = bfin_device_ready; + nand->chip_delay = 30; +} +#endif /* (CONFIG_COMMANDS & CFG_CMD_NAND) */ |