ifx_nand.h

基于mips CPU

/*
 * NAND Flash hardware definition for INCA-IP development board.
 *
 * Copyright (c) 2003  Wolfgang Denk <[e-mail]>
 *
 * 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
 *
 * ########################################################################
 *
 *  ifx_nand.h
 *
 *  Description:
 *    device driver of NAND controller of INCA-IP chip
 *  Author:
 *    Winder Sung
 *  Created:
 *    20 NOV 2005
 *  History & Modification Tag:
 *  ___________________________________________________________________________
 *  |  Tag   |                  Comments                   | Modifier & Time  |
 *  |--------+---------------------------------------------+------------------|
 *  |  0.0   | First version of this driver and the tag is |    Winder Sung   |
 *  |        | implied.                                    |    20 NOV 2005   |
 *  ---------------------------------------------------------------------------
 * 
 */

/*
 *  Common Head File
 */
#include <asm/inca-ip.h>
#include <asm/addrspace.h>

#ifdef NAND_DEBUG
#define NANDPRINT printf
#else
#define NANDPRINT(fmt,args...)
#endif

 /*
 *  Chip Specific Head File
 */
#define CLE_ADDR_BIT	0x01
#define ALE_ADDR_BIT	0x02


/*
 * ####################################
 *     Parameters to Configure NAND
 * ####################################
 */

/*
 * ####################################
 *              Definition
 * ####################################
 */
/*
 *  NAND Flash Device RD/BY State Register
 */
#define NAND_WAIT_RD                    ((*INCA_IP_Ports_P1_IN & (1 << 17)) == (1 << 17) ? 1 : 0)

/*
 * ####################################
 *             Declaration
 * ####################################
 */
// select chip
#define NAND_ENABLE_CE(nand) do{*INCA_IP_Ports_P1_OUT &= ~(1 << 16);}while(0)
// de-select chip
#define NAND_DISABLE_CE(nand) do{*INCA_IP_Ports_P1_OUT |= (1 << 16);}while(0)
// Assert the CLE (Command Latch Enable) line to the flash chip
#define NAND_CTL_SETCLE(nandptr) do{(unsigned long) nandptr |= CLE_ADDR_BIT;}while(0)
// Lower the CLE line
#define NAND_CTL_CLRCLE(nandptr) do{(unsigned long) nandptr &= ~CLE_ADDR_BIT;}while(0)
// Assert the ALE (Adress Latch Enable) line to the flash chip
#define NAND_CTL_SETALE(nandptr) do{(unsigned long) nandptr |= ALE_ADDR_BIT;}while(0)
// Lower the ALE line
#define NAND_CTL_CLRALE(nandptr) do{(unsigned long) nandptr &= ~ALE_ADDR_BIT;}while(0)

// Write Command
#define WRITE_NAND_COMMAND(d, adr) do{*(volatile unsigned char *)((unsigned long)(adr)) = (unsigned char)(d);NANDPRINT("CMD:%x\n", d);} while(0)
// Write Address
#define WRITE_NAND_ADDRESS(d, adr) do{*(volatile unsigned char *)((unsigned long)(adr)) = (unsigned char)(d);NANDPRINT("ADDR:%x\n", d);} while(0)

//Write Data
#define WRITE_NAND(d, adr) do{*(volatile unsigned char *)((unsigned long)(adr)) = (unsigned char)(d);NANDPRINT("%x", d);} while(0)
// Read Date
#define READ_NAND(adr) ((unsigned char)(*(volatile unsigned char *)(unsigned long)(adr)))

// Wait device ready, write complete
#define NAND_WAIT_READY_CMD(nand) do{NANDPRINT("Wait for write complete!!\n");}while(0)
#define NAND_WAIT_READY(nand) do{/*NANDPRINT("%x", NAND_WAIT_RD);*/udelay(12);while(!NAND_WAIT_RD){udelay(1);}}while(0)
#define NAND_WAIT_READY_RESET(nand) do{/*NANDPRINT("%x\n", NAND_WAIT_RD);*/udelay(12);while(!NAND_WAIT_RD){udleay(1);}}while(0)