/* * vivi/drivers/mtd/maps/s3c2410-flash.c:  *   Flash memory access on SA11x0 based devices * * Copyright (C) 2002 MIZI Research, Inc. *  * Based on linux/drivers/mtd/maps/s3c2410-flash.c * * This code is GPL. *  * Author: Janghoon Lyu <nandy@mizi.com> * Date  : $Date: 2002/08/29 06:10:23 $ * * $Revision: 1.6 $ * $Id: s3c2410_flash.c,v 1.6 2002/08/29 06:10:23 nandy Exp $ * * 扁拌俊 蝶扼 促弗 甘 瀝焊甫 撈儈秦輯 flash 皋葛府甫 檬扁拳茄促. * * History * * 2002-06-26: Janghoon Lyu <nandy@mizi.com> *    - Created this code * */#include "config.h"#include "machine.h"#include "mtd/mtd.h"#include "mtd/map.h"#include "io.h"#include "printk.h"#include "time.h"#ifdef CONFIG_MTD_SMC#include "mtd/nand.h"#include "heap.h"#endif#include <types.h>#include <errno.h>#ifndef CONFIG_ARCH_S3C2410#error This is for S3C2410 architecture only#endifextern struct mtd_info *mymtd;	/*struct mtd_info defined at include/mtd/mtd.h*/#ifdef CONFIG_MTD_CFI#define WINDOW_ADDR	FLASH_UNCACHED_BASEstatic __u8 s3c2410_read8(struct map_info *map, unsigned long ofs){	return readb(map->map_priv_1 + ofs);}static __u16 s3c2410_read16(struct map_info *map, unsigned long ofs){	return readw(map->map_priv_1 + ofs);}static __u32 s3c2410_read32(struct map_info *map, unsigned long ofs){	return readl(map->map_priv_1 + ofs);}static void s3c2410_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len){	memcpy(to, (void *)(map->map_priv_1 + from), len);}static void s3c2410_write8(struct map_info *map, __u8 d, unsigned long adr){	writeb(d, map->map_priv_1 + adr);}static void s3c2410_write16(struct map_info *map, __u16 d, unsigned long adr){	writew(d, map->map_priv_1 + adr);}static void s3c2410_write32(struct map_info *map, __u32 d, unsigned long adr){	writel(d, map->map_priv_1 + adr);}static void s3c2410_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len){	memcpy((void *)(map->map_priv_1 + to), from, len);}static struct map_info s3c2410_map = {	name:		"S3C2410 flash",	read8:		s3c2410_read8,	read16:		s3c2410_read16,	read32:		s3c2410_read32,	copy_from:	s3c2410_copy_from,	write8:		s3c2410_write8,	write16:	s3c2410_write16,	write32:	s3c2410_write32,	copy_to:	s3c2410_copy_to,	map_priv_1:	WINDOW_ADDR,	map_priv_2:	-1,};extern void set_vpp(struct map_info *map, int vpp);static int cfi_init(void){	/* Default flash buswidth */	s3c2410_map.buswidth = FLASH_BUSWIDTH;	/* Default flash size */	s3c2410_map.size = FLASH_SIZE;	s3c2410_map.set_vpp = set_vpp;	/*	 * Now let's probe for the actual flash.  Do it here since	 * specific machine settings might have been set above.	 */	printk("S3C2410 flash: probing %d-bit flash bus\n", s3c2410_map.buswidth*8);	mymtd = do_map_probe("cfi_probe", &s3c2410_map);	if (!mymtd) return -ENXIO;	return 0;}#endif /* CONFIG_MTD_CFI */#ifdef CONFIG_S3C2410_AMD_BOOTstatic __u8 s3c2410_read8(struct map_info *map, unsigned long ofs){	return readb(map->map_priv_1 + ofs);}static __u16 s3c2410_read16(struct map_info *map, unsigned long ofs){	return readw(map->map_priv_1 + ofs);}static __u32 s3c2410_read32(struct map_info *map, unsigned long ofs){	return readl(map->map_priv_1 + ofs);}static void s3c2410_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len){	memcpy(to, (void *)(map->map_priv_1 + from), len);}static void s3c2410_write8(struct map_info *map, __u8 d, unsigned long adr){	writeb(d, map->map_priv_1 + adr);}static void s3c2410_write16(struct map_info *map, __u16 d, unsigned long adr){	writew(d, map->map_priv_1 + adr);}static void s3c2410_write32(struct map_info *map, __u32 d, unsigned long adr){	writel(d, map->map_priv_1 + adr);}static void s3c2410_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len){	memcpy((void *)(map->map_priv_1 + to), from, len);}static struct map_info s3c2410_map = {	name:		"S3C2410 amd flash",	read8:		s3c2410_read8,	read16:		s3c2410_read16,	read32:		s3c2410_read32,	copy_from:	s3c2410_copy_from,	write8:		s3c2410_write8,	write16:	s3c2410_write16,	write32:	s3c2410_write32,	copy_to:	s3c2410_copy_to,	map_priv_1:	FLASH_UNCACHED_BASE,	//map_priv_1:	FLASH_BASE,	map_priv_2:	-1,};extern void set_vpp(struct map_info *map, int vpp);static int amd_init(void){	/* Default flash buswidth */	s3c2410_map.buswidth = FLASH_BUSWIDTH;	/* Default flash size */	s3c2410_map.size = FLASH_SIZE;	s3c2410_map.set_vpp = set_vpp;	/*	 * Now let's probe for the actual flash.  Do it here since	 * specific machine settings might have been set above.	 */	printk("S3C2410 flash: probing %d-bit flash bus\n", s3c2410_map.buswidth*8);	mymtd = do_map_probe("amd_flash", &s3c2410_map);	if (!mymtd) return -ENXIO;	return 0;}#endif /* CONFIG_MTD_CFI */#ifdef CONFIG_MTD_SMCstatic void smc_hwcontrol(int cmd) {	switch (cmd) {	case NAND_CTL_SETNCE:		NFCONF &= ~NFCONF_nFCE_HIGH; break;	case NAND_CTL_CLRNCE:		NFCONF |= NFCONF_nFCE_HIGH; break;	case NAND_CTL_SETCLE:		break;	case NAND_CTL_CLRCLE:		break;	case NAND_CTL_SETALE:		break;	case NAND_CTL_CLRALE:		break;	case NAND_CTL_DAT_IN:		break;	case NAND_CTL_DAT_OUT:		break;	}}static voidwrite_cmd(u_char val) {	NFCMD = (u_char)val;}static voidwrite_addr(u_char val) {	NFADDR = (u_char)val;}static u_charread_data(void) {	return (u_char)NFDATA;}static voidwrite_data(u_char val) {	NFDATA = (u_char)val;}static voidwait_for_ready(void) {	while (!(NFSTAT & NFSTAT_RnB)) {		/* Busy */		udelay(10);	}}inline intsmc_insert(struct nand_chip *this) {	/* Scan to find existance of the device */    if (smc_scan(mymtd)) {		return -ENXIO;    }    /* Allocate memory for internal data buffer */    this->data_buf = mmalloc(sizeof(u_char) *			     (mymtd->oobblock + mymtd->oobsize));    if (!this->data_buf) {		printk("Unable to allocate NAND data buffer for S3C2410.\n");		this->data_buf = NULL;		return -ENOMEM;    }    return 0;}static intsmc_init(void){/*struct mtd_info *mymtd，數據類型在include/mtd/mtd.h*//*strcut nand_chip在include/mtd/nand.h中定義*/	struct nand_chip *this;	u_int16_t nfconf;	/* Allocate memory for MTD device structure and private data */	mymtd = mmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip));	if (!mymtd) {		printk("Unable to allocate S3C2410 NAND MTD device structure.\n");		return -ENOMEM;	}	/* Get pointer to private data */	this = (struct nand_chip *)(&mymtd[1]);	/* Initialize structures */	memset((char *)mymtd, 0, sizeof(struct mtd_info));	memset((char *)this, 0, sizeof(struct nand_chip));	/* Link the private data with the MTD structure */	mymtd->priv = this;	/* set NAND Flash  controller */	nfconf = NFCONF;	/* NAND Flash controller enable */	nfconf |= NFCONF_FCTRL_EN;	/* Set flash memory timing */	nfconf &= ~NFCONF_TWRPH1;	/* 0x0 */	nfconf |= NFCONF_TWRPH0_3;	/* 0x3 */	nfconf &= ~NFCONF_TACLS;	/* 0x0 */	NFCONF = nfconf;	/* Set address of NAND IO lines */	this->hwcontrol = smc_hwcontrol;	this->write_cmd = write_cmd;	this->write_addr = write_addr;	this->read_data = read_data;	this->write_data = write_data;	this->wait_for_ready = wait_for_ready;	/* Chip Enable -> RESET -> Wait for Ready -> Chip Disable */	this->hwcontrol(NAND_CTL_SETNCE);	this->write_cmd(NAND_CMD_RESET);	this->wait_for_ready();	this->hwcontrol(NAND_CTL_CLRNCE);	smc_insert(this);	return 0;}#endif /* CONFIG_MTD_SMC */int mtd_init(void){	int ret;#ifdef CONFIG_MTD_CFI		/*is not set*/	ret = cfi_init();#endif#ifdef CONFIG_MTD_SMC9		/*=y*/	ret = smc_init();#endif#ifdef CONFIG_S3C2410_AMD_BOOT	/*is not set*/	ret = amd_init();#endif	if (ret) {		mymtd = NULL;		return ret;	}	return 0;}