nand_Flash_norflash_driver.rar_nand flash_norflash_s3c2410 nand

2410 nand flash的驱动文件 #include <linux/slab.h> #include <linux/module.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/compatmac.h> #include <linux/irq.h> #include <asm/io.h> #include <asm/hardware.h> #include <asm/sizes.h> #include <linux/compiler.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/sched.h> static struct mtd_info * smc _mtd = NULL; #include <linux/mtd/partitions.h> //对应于开发板的NAND Flash参数 static struct mtd_partition smc_partitions[] = { { name: "vivi", size: 0x00030000, offset: 0x0, mask_flags: MTD_WRITEABLE, },{ name: "kernel", size: 0x000d0000, offset: 0x00030000, mask_flags: MTD_WRITEABLE, //force read-only }, { name: "root", size: 0x03200000, offset: 0x00100000, mask_flags: MTD_WRITEABLE, // force read-only },{ name: "user_file", size: 0x00A00000, offset: 0x03300000, } }; static 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 void write_cmd(u_char val) { NFCMD = (u_char) val; } static void write_addr(u_char val) { NFADDR = (u_char) val; } static u_char read_data(void) { return (u_char) NFDATA; } static void write_data(u_char val) { NFDATA = (u_char) val; } static void wait_for_ready(void) { while (!(NFSTAT & NFSTAT_RnB)) { /* 忙 */ udelay(10); } } inline int smc_insert(struct nand_chip *this) { /* Scan to find existance of the device */ if (smc_scan (s3c2410_mtd)) { return -ENXIO; } /* 为内部缓冲区分配内存 */ this->data_buf = kmalloc(sizeof(u_char) * (s3c2410_mtd->oobblock + s3c2410_mtd->oobsize), GFP_KERNEL); if (!this->data_buf) { printk ("Unable to allocate NAND data buffer for S3C2410.\n"); this->data_buf = NULL; return -ENOMEM; } #ifdef CONFIG_MTD_SMC_S3C2410_SMDK_PARTITION add_mtd_partitions(s3c2410_mtd, &smc_partitions, sizeof(smc_partitions)/sizeof(smc_partitions[0])); //#else add_mtd_device(s3c2410_mtd); #endif return 0; } inline void smc_remove(struct nand_chip *this) { #if defined(CONFIG_MTD_SMC_S3C2410_SMDK_PARTITION) del_mtd_partitions(s3c2410_mtd); //#else del_mtd_device(s3c2410_mtd); #endif s3c2410_mtd->size = 0; if (this->data_buf != NULL) { /* 释放数据缓冲区*/ kfree (this->data_buf); this->data_buf = NULL; } } #ifdef CONFIG_PM static unsigned long nfcon; static int s3c2410_smc_pm_callback(struct pm_dev *pm_dev, pm_request_t req, void *data) { struct nand_chip *this = (struct nand_chip *)pm_dev->data; switch (req) { case PM_SUSPEND: nfcon = NFCONF; break; case PM_RESUME: NFCONF = nfcon; /* 使能芯片-> 复位 -> 等待到可读 -> 屏蔽芯片 */ this->hwcontrol(NAND_CTL_SETNCE); this->write_cmd(NAND_CMD_RESET); this->wait_for_ready(); this->hwcontrol(NAND_CTL_CLRNCE); break; } return 0; } #endif /* * 主程序 */ int __init smc_s3c2410_init (void) { struct nand_chip *this; u_int16_t nfconf; /*为 MTD设备分配内存 */ s3c2410_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip), GFP_KERNEL); if (!s3c2410_mtd) { printk ("Unable to allocate S3C2410 NAND MTD device structure.\n"); return -ENOMEM; } /* 取得指向数据的指针*/ this = (struct nand_chip *) (&s3c2410_mtd[1]); /* 初始化结构 */ memset((char *) s3c2410_mtd, 0, sizeof(struct mtd_info)); memset((char *) this, 0, sizeof(struct nand_chip)); s3c2410_mtd->priv = this; /* 设置闪存控制器*/ { nfconf = NFCONF; /* 使能闪存控制器*/ nfconf |= NFCONF_FCTRL_EN; /* 设置闪存时序 */ nfconf &= ~NFCONF_TWRPH1; /* 0x0 */ nfconf |= NFCONF_TWRPH0_3; /* 0x3 */ nfconf &= ~NFCONF_TACLS; /* 0x0 */ NFCONF = nfconf; } /* 设置NAND的I/O地址 */ 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; /* 使能芯片-> 复位 -> 等待到可读 -> 屏蔽芯片 */ this->hwcontrol(NAND_CTL_SETNCE); this->write_cmd(NAND_CMD_RESET); this->wait_for_ready(); this->hwcontrol(NAND_CTL_CLRNCE); smc_insert(this); #ifdef CONFIG_PM smc_pm_dev = pm_register(PM_DEBUG_DEV, PM_SYS_MISC, s3c2410_smc_pm_callback); if (smc_pm_dev) smc_pm_dev->data = &s3c2410_mtd[1]; #endif return 0; } module_init(smc_s3c2410_init); #ifdef MODULE static void __exit smc_s3c2410_cleanup (void) { struct nand_chip *this = (struct nand_chip *) &s3c2410_mtd[1]; smc_remove(this); /* 释放MTD设备 */ kfree (s3c2410_mtd); } module_exit(smc_s3c2410_cleanup); #endif MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("SMC Card on S3C2410 board");