| /* |
| * (C) Copyright 2006 DENX Software Engineering |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| |
| #if defined(CONFIG_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 *mtd, int cmd, unsigned int ctrl) |
| { |
| struct nand_chip *this = mtd->priv; |
| ulong base = (ulong) this->IO_ADDR_W; |
| |
| if (ctrl & NAND_CTRL_CHANGE) { |
| if ( ctrl & NAND_CLE ) |
| MACRO_NAND_CTL_SETCLE((unsigned long)base); |
| else |
| MACRO_NAND_CTL_CLRCLE((unsigned long)base); |
| if ( ctrl & NAND_ALE ) |
| MACRO_NAND_CTL_CLRCLE((unsigned long)base); |
| else |
| MACRO_NAND_CTL_CLRALE((unsigned long)base); |
| if ( ctrl & NAND_NCE ) |
| MACRO_NAND_ENABLE_CE((unsigned long)base); |
| else |
| MACRO_NAND_DISABLE_CE((unsigned long)base); |
| } |
| |
| if (cmd != NAND_CMD_NONE) |
| writeb(cmd, this->IO_ADDR_W); |
| } |
| |
| |
| /* |
| * 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 CONFIG_SYS_NAND0_BASE: |
| rb_gpio_pin = CONFIG_SYS_NAND0_RDY; |
| break; |
| case CONFIG_SYS_NAND1_BASE: |
| rb_gpio_pin = CONFIG_SYS_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 |
| * - cmd_ctrl: 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 |
| * - ecc.mode: 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. |
| */ |
| int board_nand_init(struct nand_chip *nand) |
| { |
| |
| nand->cmd_ctrl = ppchameleonevb_hwcontrol; |
| nand->dev_ready = ppchameleonevb_device_ready; |
| nand->ecc.mode = NAND_ECC_SOFT; |
| nand->chip_delay = NAND_BIG_DELAY_US; |
| nand->options = NAND_SAMSUNG_LP_OPTIONS; |
| return 0; |
| } |
| #endif |
