一、移植前的修改
1.1 include/configs/jz2440修改
原来的定义：
可以看出，要先定义CONFIG_CMD_NAND才能使能NANDFlash。
这个在我们文件中的82行有定义，所以不需要定义了。
将里面的S3C2410全部改为S3C2440：
1.2 drivers/mtd/nand/修改
拷贝s3c2410_nand.c 成 s3c2440_nand.c
在此目录的makefile中添加 s3c2440_nand.c
修改s3c2440_nand.c 文件，从board_nand_init 逐行检测修改，代码如下：
#include <common.h> #include <nand.h>
#include <asm/arch/s3c24x0_cpu.h>
#include <asm/io.h> /* NFCONF 寄存器定义 */
#define S3C2440_NFCONF_EN (1<<15)
#define S3C2440_NFCONF_512BYTE (1<<14)
#define S3C2440_NFCONF_4STEP (1<<13)
#define S3C2440_NFCONF_INITECC (1<<12)
#define S3C2440_NFCONF_nFCE (1<<1)
#define S3C2440_NFCONF_TACLS(x) ((x)<<12)
#define S3C2440_NFCONF_TWRPH0(x) ((x)<<8)
#define S3C2440_NFCONF_TWRPH1(x) ((x)<<4) /* NFCONF 寄存器定义 */
#define S3C2440_NFCONT_LOCKTIGHT (1<<13)
#define S3C2440_NFCONT_SOFTLOCK (1<<12)
#define S3C2440_NFCONT_ENLLLEGALINT (1<<10)
#define S3C2440_NFCONT_ENRnBINT (1<<9)
#define S3C2440_NFCONT_Rn (1<<8)
#define S3C2440_NFCONT_SPAREECCLOCK (1<<6)
#define S3C2440_NFCONT_MAINECCLOCK (1<<5)
#define S3C2440_NFCONT_ECC (1<<4)
#define S3C2440_NFCONT_nCE (1<<1)
#define S3C2440_NFCONT_MODE (1<<0) #define S3C2440_ADDR_NALE 4
#define S3C2440_ADDR_NCLE 8 #ifdef CONFIG_NAND_SPL /* in the early stage of NAND flash booting, printf() is not available */
#define printf(fmt, args...) static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
int i;
struct nand_chip *this = mtd->priv; for (i = ; i < len; i++)
buf[i] = readb(this->IO_ADDR_R);
}
#endif /* ctrl:表示做什么，选中芯片/取消片选，是发命令还是发地址
* cmd :命令值或地址值
*/
static void s3c24x0_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct s3c24x0_nand *nand = s3c24x0_get_base_nand(); debug("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl); if (ctrl & NAND_CLE) {
/* 发命令 */
writeb(cmd, &nand->nfcmd);
}
else if (ctrl & NAND_ALE) {
/* 发地址 */
writeb(cmd, &nand->nfaddr);
} } /**
* nand_select_chip - [DEFAULT] control CE line
* @mtd: MTD device structure
* @chipnr: chipnumber to select, -1 for deselect
*
* Default select function for 1 chip devices.
*/
void s3c2440_nand_select(struct mtd_info *mtd, int chipnr)
{
struct s3c24x0_nand *nand = s3c24x0_get_base_nand(); switch (chipnr) {
case -: /* 取消选中 */
nand->nfcont |= S3C2440_NFCONT_nCE;
break;
case : /* 选中 */
nand->nfcont &= ~S3C2440_NFCONT_nCE;
break; default:
BUG();
}
} static int s3c24x0_dev_ready(struct mtd_info *mtd)
{
struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
debug("dev_ready\n");
return readl(&nand->nfstat) & 0x01;
} #ifdef CONFIG_S3C2440_NAND_HWECC
void s3c24x0_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
debug("s3c24x0_nand_enable_hwecc(%p, %d)\n", mtd, mode);
writel(readl(&nand->nfconf) | S3C2440_NFCONF_INITECC, &nand->nfconf);
} static int s3c24x0_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
u_char *ecc_code)
{
struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
ecc_code[] = readb(&nand->nfecc);
ecc_code[] = readb(&nand->nfecc + );
ecc_code[] = readb(&nand->nfecc + );
debug("s3c24x0_nand_calculate_hwecc(%p,): 0x%02x 0x%02x 0x%02x\n",
mtd , ecc_code[], ecc_code[], ecc_code[]); return ;
} static int s3c24x0_nand_correct_data(struct mtd_info *mtd, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
if (read_ecc[] == calc_ecc[] &&
read_ecc[] == calc_ecc[] &&
read_ecc[] == calc_ecc[])
return ; printf("s3c24x0_nand_correct_data: not implemented\n");
return -;
}
#endif int board_nand_init(struct nand_chip *nand)
{
u_int32_t cfg = ;
u_int8_t tacls, twrph0, twrph1;
struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
struct s3c24x0_nand *nand_reg = s3c24x0_get_base_nand(); writel(readl(&clk_power->clkcon) | ( << ), &clk_power->clkcon); /* 时序设置 */
tacls = ;
twrph0 = ;
twrph1 = ; /* 初始化时序 */
cfg |= S3C2440_NFCONF_TACLS(tacls - );
cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - );
cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - );
writel(cfg, &nand_reg->nfconf); /* 使能NANDFLASH控制器，初始化ECC，禁止片选 */
writel(S3C2440_NFCONT_MODE | S3C2440_NFCONT_nCE | S3C2440_NFCONT_ECC, &nand_reg->nfcont); /* initialize nand_chip data structure */
nand->IO_ADDR_R = (void *)&nand_reg->nfdata;
nand->IO_ADDR_W = (void *)&nand_reg->nfdata; nand->select_chip = s3c2440_nand_select; /* hwcontrol always must be implemented */
nand->cmd_ctrl = s3c24x0_hwcontrol; nand->dev_ready = s3c24x0_dev_ready; #ifdef CONFIG_S3C2410_NAND_HWECC
nand->ecc.hwctl = s3c24x0_nand_enable_hwecc;
nand->ecc.calculate = s3c24x0_nand_calculate_ecc;
nand->ecc.correct = s3c24x0_nand_correct_data;
nand->ecc.mode = NAND_ECC_HW;
nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
nand->ecc.strength = ;
#else
nand->ecc.mode = NAND_ECC_SOFT;
#endif #ifdef CONFIG_S3C2440_NAND_BBT
nand->bbt_options |= NAND_BBT_USE_FLASH;
#endif return ;
}
修改过程如下：
u-boot-2016.05\common\board_r：board_init_r函数中的初始化序列init_sequence_r中的：
initr_nand
nand_init
nand_init_chip
board_nand_init
设置nand_chip结构体, 提供底层的操作函数
nand_scan
nand_scan_ident
nand_set_defaults
chip->select_chip = nand_select_chip;
chip->cmdfunc = nand_command;
chip->read_byte = busw ? nand_read_byte16 : nand_read_byte; nand_get_flash_type
chip->select_chip
chip->cmdfunc(mtd, NAND_CMD_RESET, -, -);
nand_command() // 即可以用来发命令，也可以用来发列地址(页内地址)、行地址(哪一页)
chip->cmd_ctrl
s3c24x0_hwcontrol chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -);
*maf_id = chip->read_byte(mtd);
*dev_id = chip->read_byte(mtd);
编译运行 结果如下：
测试：
执行写，在写之前注意一定要先擦除nandflash：
将 SDRAM 的 0x31e00000 地址的 0xff 字节数据写到 NAND FLASH 的 0 地址
执行读：从 NAND FLASH 的 0 地址读 0xff 字节数据到 SDRAM 的 0x31f00000 地址
比较：
