nand.rar_ARM 源码

#define LARGER_NAND_PAGE #define GSTATUS1 (*(volatile unsigned int *)0x560000B0) #define BUSY 1 #define NAND_SECTOR_SIZE 512 #define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1) #define NAND_SECTOR_SIZE_LP 2048 #define NAND_BLOCK_MASK_LP (NAND_SECTOR_SIZE_LP - 1) typedef unsigned int S3C24X0_REG32; /* NAND FLASH (see S3C2410 manual chapter 6) */ typedef struct { S3C24X0_REG32 NFCONF; S3C24X0_REG32 NFCMD; S3C24X0_REG32 NFADDR; S3C24X0_REG32 NFDATA; S3C24X0_REG32 NFSTAT; S3C24X0_REG32 NFECC; } S3C2410_NAND; /* NAND FLASH (see S3C2440 manual chapter 6, www.100ask.net) */ typedef struct { S3C24X0_REG32 NFCONF; S3C24X0_REG32 NFCONT; S3C24X0_REG32 NFCMD; S3C24X0_REG32 NFADDR; S3C24X0_REG32 NFDATA; S3C24X0_REG32 NFMECCD0; S3C24X0_REG32 NFMECCD1; S3C24X0_REG32 NFSECCD; S3C24X0_REG32 NFSTAT; S3C24X0_REG32 NFESTAT0; S3C24X0_REG32 NFESTAT1; S3C24X0_REG32 NFMECC0; S3C24X0_REG32 NFMECC1; S3C24X0_REG32 NFSECC; S3C24X0_REG32 NFSBLK; S3C24X0_REG32 NFEBLK; } S3C2440_NAND; typedef struct { void (*nand_reset)(void); void (*wait_idle)(void); void (*nand_select_chip)(void); void (*nand_deselect_chip)(void); void (*write_cmd)(int cmd); void (*write_addr)(unsigned int addr); unsigned char (*read_data)(void); }t_nand_chip; static S3C2410_NAND * s3c2410nand = (S3C2410_NAND *)0x4e000000; static S3C2440_NAND * s3c2440nand = (S3C2440_NAND *)0x4e000000; static t_nand_chip nand_chip; /* 供外部调用的函数 */ void nand_init(void); void nand_read(unsigned char *buf, unsigned long start_addr, int size); /* NAND Flash操作的总入口, 它们将调用S3C2410或S3C2440的相应函数 */ static void nand_reset(void); static void wait_idle(void); static void nand_select_chip(void); static void nand_deselect_chip(void); static void write_cmd(int cmd); static void write_addr(unsigned int addr); static unsigned char read_data(void); /* S3C2410的NAND Flash处理函数 */ static void s3c2410_nand_reset(void); static void s3c2410_wait_idle(void); static void s3c2410_nand_select_chip(void); static void s3c2410_nand_deselect_chip(void); static void s3c2410_write_cmd(int cmd); static void s3c2410_write_addr(unsigned int addr); static unsigned char s3c2410_read_data(); /* S3C2440的NAND Flash处理函数 */ static void s3c2440_nand_reset(void); static void s3c2440_wait_idle(void); static void s3c2440_nand_select_chip(void); static void s3c2440_nand_deselect_chip(void); static void s3c2440_write_cmd(int cmd); static void s3c2440_write_addr(unsigned int addr); static unsigned char s3c2440_read_data(void); /* S3C2410的NAND Flash操作函数 */ /* 复位 */ static void s3c2410_nand_reset(void) { s3c2410_nand_select_chip(); s3c2410_write_cmd(0xff); // 复位命令 s3c2410_wait_idle(); s3c2410_nand_deselect_chip(); } /* 等待NAND Flash就绪 */ static void s3c2410_wait_idle(void) { int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFSTAT; while(!(*p & BUSY)) for(i=0; i<10; i++); } /* 发出片选信号 */ static void s3c2410_nand_select_chip(void) { int i; s3c2410nand->NFCONF &= ~(1<<11); for(i=0; i<10; i++); } /* 取消片选信号 */ static void s3c2410_nand_deselect_chip(void) { s3c2410nand->NFCONF |= (1<<11); } /* 发出命令 */ static void s3c2410_write_cmd(int cmd) { volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFCMD; *p = cmd; } /* 发出地址 */ static void s3c2410_write_addr(unsigned int addr) { int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFADDR; *p = addr & 0xff; for(i=0; i<10; i++); *p = (addr >> 9) & 0xff; for(i=0; i<10; i++); *p = (addr >> 17) & 0xff; for(i=0; i<10; i++); *p = (addr >> 25) & 0xff; for(i=0; i<10; i++); } /* 读取数据 */ static unsigned char s3c2410_read_data(void) { volatile unsigned char *p = (volatile unsigned char *)&s3c2410nand->NFDATA; return *p; } /* S3C2440的NAND Flash操作函数 */ /* 复位 */ static void s3c2440_nand_reset(void) { s3c2440_nand_select_chip(); s3c2440_write_cmd(0xff); // 复位命令 s3c2440_wait_idle(); s3c2440_nand_deselect_chip(); } /* 等待NAND Flash就绪 */ static void s3c2440_wait_idle(void) { int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFSTAT; while(!(*p & BUSY)) for(i=0; i<10; i++); } /* 发出片选信号 */ static void s3c2440_nand_select_chip(void) { int i; s3c2440nand->NFCONT &= ~(1<<1); for(i=0; i<10; i++); } /* 取消片选信号 */ static void s3c2440_nand_deselect_chip(void) { s3c2440nand->NFCONT |= (1<<1); } /* 发出命令 */ static void s3c2440_write_cmd(int cmd) { volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFCMD; *p = cmd; } /* 发出地址 */ static void s3c2440_write_addr(unsigned int addr) { int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR; *p = addr & 0xff; for(i=0; i<10; i++); *p = (addr >> 9) & 0xff; for(i=0; i<10; i++); *p = (addr >> 17) & 0xff; for(i=0; i<10; i++); *p = (addr >> 25) & 0xff; for(i=0; i<10; i++); } static void s3c2440_write_addr_lp(unsigned int addr) { int i; volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR; int col, page; col = addr & NAND_BLOCK_MASK_LP; page = addr / NAND_SECTOR_SIZE_LP; *p = col & 0xff; /* Column Address A0~A7 */ for(i=0; i<10; i++); *p = (col >> 8) & 0x0f; /* Column Address A8~A11 */ for(i=0; i<10; i++); *p = page & 0xff; /* Row Address A12~A19 */ for(i=0; i<10; i++); *p = (page >> 8) & 0xff; /* Row Address A20~A27 */ for(i=0; i<10; i++); *p = (page >> 16) & 0x03; /* Row Address A28~A29 */ for(i=0; i<10; i++); } /* 读取数据 */ static unsigned char s3c2440_read_data(void) { volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFDATA; return *p; } /* 在第一次使用NAND Flash前，复位一下NAND Flash */ static void nand_reset(void) { nand_chip.nand_reset(); } static void wait_idle(void) { nand_chip.wait_idle(); } static void nand_select_chip(void) { int i; nand_chip.nand_select_chip(); for(i=0; i<10; i++); } static void nand_deselect_chip(void) { nand_chip.nand_deselect_chip(); } static void write_cmd(int cmd) { nand_chip.write_cmd(cmd); } static void write_addr(unsigned int addr) { nand_chip.write_addr(addr); } static unsigned char read_data(void) { return nand_chip.read_data(); } /* 初始化NAND Flash */ void nand_init(void) { #define TACLS 0 #define TWRPH0 3 #define TWRPH1 0 /* 判断是S3C2410还是S3C2440 */ if ((GSTATUS1 == 0x32410000) || (GSTATUS1 == 0x32410002)) { nand_chip.nand_reset = s3c2410_nand_reset; nand_chip.wait_idle = s3c2410_wait_idle; nand_chip.nand_select_chip = s3c2410_nand_select_chip; nand_chip.nand_deselect_chip = s3c2410_nand_deselect_chip; nand_chip.write_cmd = s3c2410_write_cmd; nand_chip.write_addr = s3c2410_write_addr; nand_chip.read_data = s3c2410_read_data; /* 使能NAND Flash控制器, 初始化ECC, 禁止片选, 设置时序 */ s3c2410nand->NFCONF = (1<<15)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0); } else { nand_chip.nand_reset = s3c2440_nand_reset; nand_chip.wait_idle = s3c2440_wait_idle; nand_chip.nand_select_chip = s3c2440_nand_select_chip; nand_chip.nand_deselect_chip = s3c2440_nand_deselect_chip; nand_chip.write_cmd = s3c2440_write_cmd; #ifdef LARGER_NAND_PAGE nand_chip.write_addr = s3c2440_write_addr_lp; #else nand_chip.write_addr = s3c2440_write_addr; #endif nand_chip.read_data = s3c2440_read_data; /* 设置时序 */ s3c2440nand->NFCONF = (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4); /