1 /* 2 * Genericish driver for memory mapped NAND devices 3 * 4 * Copyright (c) 2006-2009 Analog Devices Inc. 5 * Licensed under the GPL-2 or later. 6 */ 7 8 /* Your board must implement the following macros: 9 * NAND_PLAT_WRITE_CMD(chip, cmd) 10 * NAND_PLAT_WRITE_ADR(chip, cmd) 11 * NAND_PLAT_INIT() 12 * 13 * It may also implement the following: 14 * NAND_PLAT_DEV_READY(chip) 15 */ 16 17 #include <common.h> 18 #include <asm/io.h> 19 #ifdef NAND_PLAT_GPIO_DEV_READY 20 # include <asm/gpio.h> 21 # define NAND_PLAT_DEV_READY(chip) gpio_get_value(NAND_PLAT_GPIO_DEV_READY) 22 #endif 23 24 #include <nand.h> 25 26 static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) 27 { 28 struct nand_chip *this = mtd_to_nand(mtd); 29 30 if (cmd == NAND_CMD_NONE) 31 return; 32 33 if (ctrl & NAND_CLE) 34 NAND_PLAT_WRITE_CMD(this, cmd); 35 else 36 NAND_PLAT_WRITE_ADR(this, cmd); 37 } 38 39 #ifdef NAND_PLAT_DEV_READY 40 static int plat_dev_ready(struct mtd_info *mtd) 41 { 42 return NAND_PLAT_DEV_READY((struct nand_chip *)mtd_to_nand(mtd)); 43 } 44 #else 45 # define plat_dev_ready NULL 46 #endif 47 48 int board_nand_init(struct nand_chip *nand) 49 { 50 #ifdef NAND_PLAT_GPIO_DEV_READY 51 gpio_request(NAND_PLAT_GPIO_DEV_READY, "nand-plat"); 52 gpio_direction_input(NAND_PLAT_GPIO_DEV_READY); 53 #endif 54 55 #ifdef NAND_PLAT_INIT 56 NAND_PLAT_INIT(); 57 #endif 58 59 nand->cmd_ctrl = plat_cmd_ctrl; 60 nand->dev_ready = plat_dev_ready; 61 nand->ecc.mode = NAND_ECC_SOFT; 62 63 return 0; 64 } 65