diff options
Diffstat (limited to 'board/dave/PPChameleonEVB/nand.c')
| -rw-r--r-- | board/dave/PPChameleonEVB/nand.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/board/dave/PPChameleonEVB/nand.c b/board/dave/PPChameleonEVB/nand.c new file mode 100644 index 0000000..61edc78 --- /dev/null +++ b/board/dave/PPChameleonEVB/nand.c @@ -0,0 +1,117 @@ +/* + * (C) Copyright 2006 DENX Software Engineering + * + * 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> + + +#if (CONFIG_COMMANDS & CFG_CMD_NAND) + +#include <nand.h> + +/* + * hardware specific access to control-lines + * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c) + */ +static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd) +{ + struct nand_chip *this = mtdinfo->priv; + ulong base = (ulong) this->IO_ADDR_W; + + switch(cmd) { + case NAND_CTL_SETCLE: + MACRO_NAND_CTL_SETCLE((unsigned long)base); + break; + case NAND_CTL_CLRCLE: + MACRO_NAND_CTL_CLRCLE((unsigned long)base); + break; + case NAND_CTL_SETALE: + MACRO_NAND_CTL_SETALE((unsigned long)base); + break; + case NAND_CTL_CLRALE: + MACRO_NAND_CTL_CLRALE((unsigned long)base); + break; + case NAND_CTL_SETNCE: + MACRO_NAND_ENABLE_CE((unsigned long)base); + break; + case NAND_CTL_CLRNCE: + MACRO_NAND_DISABLE_CE((unsigned long)base); + break; + } +} + + +/* + * read device ready pin + * function +/- borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c) + */ +static int ppchameleonevb_device_ready(struct mtd_info *mtdinfo) +{ + struct nand_chip *this = mtdinfo->priv; + ulong rb_gpio_pin; + + /* use the base addr to find out which chip are we dealing with */ + switch((ulong) this->IO_ADDR_W) { + case CFG_NAND0_BASE: + rb_gpio_pin = CFG_NAND0_RDY; + break; + case CFG_NAND1_BASE: + rb_gpio_pin = CFG_NAND1_RDY; + break; + default: /* this should never happen */ + return 0; + break; + } + + if (in32(GPIO0_IR) & rb_gpio_pin) + return 1; + return 0; +} + + +/* + * 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) +{ + + nand->hwcontrol = ppchameleonevb_hwcontrol; + nand->dev_ready = ppchameleonevb_device_ready; + nand->eccmode = NAND_ECC_SOFT; + nand->chip_delay = NAND_BIG_DELAY_US; + nand->options = NAND_SAMSUNG_LP_OPTIONS; +} +#endif /* (CONFIG_COMMANDS & CFG_CMD_NAND) */ |