框架入口源文件：s3c_nand.c
（可根据入口源文件，再按着框架到内核走一遍）
内核版本：linux_2.6.22.6 硬件平台：JZ2440
以下是驱动框架：
以下是驱动代码 s3c_nand.c ：
#include <linux/module.h> #include <linux/types.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/ioport.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/clk.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/nand_ecc.h> #include <linux/mtd/partitions.h> #include <asm/io.h> #include <asm/arch/regs-nand.h> #include <asm/arch/nand.h> //定义一个 nand_chip 结构体 static struct nand_chip *s3c_chip; //定义一个 mtd_info 结构体 static struct mtd_info *s3c_info; //定义寄存器结构体 static struct s3c_nand_regs { unsigned long nfconf ; unsigned long nfcont ; unsigned long nfcmd ; unsigned long nfaddr ; unsigned long nfdata ; unsigned long nfeccd0 ; unsigned long nfeccd1 ; unsigned long nfeccd ; unsigned long nfstat ; unsigned long nfestat0; unsigned long nfestat1; unsigned long nfmecc0 ; unsigned long nfmecc1 ; unsigned long nfsecc ; unsigned long nfsblk ; unsigned long nfeblk ; }*s3c_nand_regs; //分区表 static struct mtd_partition s3c_partitions[] = { [0] = { .name = "bootloader", .size = 0x00040000, .offset = 0, }, [1] = { .name = "params", .offset = MTDPART_OFS_APPEND, .size = 0x00020000, }, [2] = { .name = "kernel", .offset = MTDPART_OFS_APPEND, .size = 0x00200000, }, [3] = { .name = "root", .offset = MTDPART_OFS_APPEND, .size = MTDPART_SIZ_FULL, } }; static void s3c_select_chip(struct mtd_info *mtd, int chip) { if (chip == -1) s3c_nand_regs->nfcont |= (1<<1); else s3c_nand_regs->nfcont &= ~(1<<1); } int s3c_dev_ready(struct mtd_info *mtd) { return (s3c_nand_regs->nfstat & (1<<0)); } void s3c_cmd_ctrl(struct mtd_info *mtd, int dat,unsigned int ctrl) { if (ctrl & NAND_CLE) s3c_nand_regs->nfcmd = dat; else s3c_nand_regs->nfaddr = dat; } static int s3c_nand_init(void) { struct clk *clk; //申请 nand_chip s3c_chip = kzalloc(sizeof(struct nand_chip),GFP_KERNEL); //初始化 nand_chip 函数供扫描用 1.选中 2.状态 3.发地址和命令 5.发数据 6.读数据 s3c_nand_regs = ioremap(0x4E000000,sizeof(struct s3c_nand_regs)); s3c_chip->select_chip =s3c_select_chip; s3c_chip->dev_ready =s3c_dev_ready; s3c_chip->cmd_ctrl =s3c_cmd_ctrl; s3c_chip->IO_ADDR_R =&s3c_nand_regs->nfdata; s3c_chip->IO_ADDR_W =&s3c_nand_regs->nfdata; s3c_chip->ecc.mode =NAND_ECC_SOFT; //初始化 读写时序NFCONF 开关FCONT NAND时钟 s3c_nand_regs->nfconf = (0<<12)|(1<<8)|(0<<4); s3c_nand_regs->nfcont = (1<<1) | (1<<0); clk =clk_get(NULL,"nand"); clk_enable(clk); //申请 初始化 mtd_info s3c_info = kzalloc(sizeof(struct mtd_info), GFP_KERNEL); s3c_info->priv = s3c_chip; s3c_info->owner = THIS_MODULE; //nand_scan nand_chip --> mtd_info nand_scan(s3c_info,1); //add_mtd_partitions mtd_info --> gendisk add_mtd_partitions(s3c_info, s3c_partitions,4); return 0; } static void s3c_nand_exit(void) { iounmap(s3c_nand_regs); kfree(s3c_chip); kfree(s3c_info); del_mtd_partitions(s3c_info); } module_init(s3c_nand_init); module_exit(s3c_nand_exit); MODULE_LICENSE("GPL");
以下是编译驱动的Makefile：
KER_DIR=/work/systems/kernel/linux-2/linux-2.6.22.6 all: make -C $(KER_DIR) M=`pwd` modules clean: make -C $(KER_DIR) M=`pwd` modules clean rm -fr modules.order obj-m += s3c_nand.o