s5pv210 uboot-2012-10移植(六) 之支持NandFlash

今天12月13日是南京大屠杀遇难同胞遇难75周年，向南京大屠杀遇难者哀悼。勿忘国耻！

我的开发板上外接256M的K9F2G08U0A FLASH芯片。uboot-2012-10本身不带s5pv210的nandflash操作，s5pv210的nandflash和s3c2410的寄存器差不多，所以，我就在s3c2410的nandFlash上进行修改了，因为我不懂nandflash的HW_EEC，所以我实现的是SOFT_EEC了。

1.修改include/configs/smdkv210.h +88

/*#undef CONFIG_CMD_NAND*/
#define CONFIG_CMD_NAND
#define CONFIG_SYS_MAX_NAND_DEVICE 1
#define CONFIG_SYS_NAND_BASE 0xB0E00000
#define CONFIG_NAND_S3C2410

2.修改drivers/mtd/nand/s3c2410_nand.c +207，屏蔽了s3c2410的nandflash初始化，添加了s5pv210nandflash总线的初始化和nandflash控制器的初始化，并添加s5pv210_select_chip函数，其他不变。

int board_nand_init(struct nand_chip *nand)
{
#if 0
	u_int32_t cfg;
	u_int8_t tacls, twrph0, twrph1;
	struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
	struct s3c2410_nand *nand_reg = s3c2410_get_base_nand();

	debug("board_nand_init()\n");

	writel(readl(&clk_power->clkcon) | (1 << 4), &clk_power->clkcon);

	/* initialize hardware */
#if defined(CONFIG_S3C24XX_CUSTOM_NAND_TIMING)
	tacls  = CONFIG_S3C24XX_TACLS;
	twrph0 = CONFIG_S3C24XX_TWRPH0;
	twrph1 =  CONFIG_S3C24XX_TWRPH1;
#else
	tacls = 4;
	twrph0 = 8;
	twrph1 = 8;
#endif

	cfg = S3C2410_NFCONF_EN;
	cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
	cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
	cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
	writel(cfg, &nand_reg->nfconf);
#endif

	#define MP0_1CON (*(volatile unsigned int *)0xE02002E0)
	#define MP0_3CON (*(volatile unsigned int *)0xE0200320)
	#define NFCONF   (*(volatile unsigned int *)0xB0E00000)
	#define NFCONT   (*(volatile unsigned int *)0xB0E00004)
	#define NFCMMD   (*(volatile unsigned char *)0xB0E00008)
	#define NFADDR   (*(volatile unsigned char *)0xB0E0000C)
	#define NFDATA   (*(volatile unsigned char *)0xB0E00010)
	#define NFSTAT   (*(volatile unsigned int *)0xB0E00028)

	#define NFCONF_VAL ((7<<12)|(7<<8)|(7<<4)|(0<<3)|(0<<2)|(1<<1))
	#define NFCONT_VAL ((1<<23)|(1<<22)|(1<<2)|(0<<1)|(1<<0))

	unsigned int tmp;

	//tmp = MP0_1CON;
	//tmp &= ~((0xf<<8)|(0xf<<12));
	//tmp |= (0x3<<8) | (0x3<<12);
	//MP0_1CON = tmp;
	tmp = MP0_1CON;
	tmp &= ~(0xf<<16);
	tmp |= (0x3<<16);
	MP0_1CON = tmp;

	tmp = MP0_3CON;
	//tmp &= ~((0xf<<0)|(0xf<<4)|(0xf<<8)|(0xf<<12)|(0xf<<16)|(0xf<<20));
	//tmp |= (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16)|(0x2<<20);
	tmp &= ~((0xf<<0)|(0xf<<4)|(0xf<<8)|(0xf<<12)|(0xf<<16));
	tmp |= (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16);
	MP0_3CON = tmp;

	NFCONF = NFCONF_VAL;
	NFCONT = NFCONT_VAL;

	/* initialize nand_chip data structure */
	nand->IO_ADDR_R = (volatile unsigned char *)0xB0E00010;
	nand->IO_ADDR_W = (volatile unsigned char *)0xB0E00010;

	nand->select_chip = s5pv210_select_chip;

	/* read_buf and write_buf are default */
	/* read_byte and write_byte are default */
#ifdef CONFIG_NAND_SPL
	nand->read_buf = nand_read_buf;
#endif

	/* hwcontrol always must be implemented */
	nand->cmd_ctrl = s3c2410_hwcontrol;

	nand->dev_ready = s3c2410_dev_ready;

#ifdef CONFIG_S3C2410_NAND_HWECC
	nand->ecc.hwctl = s3c2410_nand_enable_hwecc;
	nand->ecc.calculate = s3c2410_nand_calculate_ecc;
	nand->ecc.correct = s3c2410_nand_correct_data;
	nand->ecc.mode = NAND_ECC_HW;
	nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
	nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
#else
	nand->ecc.mode = NAND_ECC_SOFT;
#endif

#ifdef CONFIG_S3C2410_NAND_BBT
	nand->options = NAND_USE_FLASH_BBT;
#else
	nand->options = 0;
#endif

	debug("end of nand_init\n");

	return 0;
}

3.在drivers/mtd/nand/s3c2410_nand.c 添加s5pv210_select_chip函数

static void s5pv210_select_chip(struct mtd_info *mtd, int chipnr)
{
	#define NFCONT   (*(volatile unsigned int *)0xB0E00004)
	
	struct nand_chip *chip = mtd->priv;

	switch (chipnr) {
	case -1:
		//chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
		NFCONT |= (1<<1);
		break;
	case 0:
		NFCONT &= ~(1<<1);
		break;

	default:
		BUG();
	}
}

4.修改drivers/mtd/nand/s3c2410_nand.c 的s3c2410_hwcontrol函数

static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
#if 0
	struct nand_chip *chip = mtd->priv;
	struct s3c2410_nand *nand = s3c2410_get_base_nand();

	debug("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);

	if (ctrl & NAND_CTRL_CHANGE) {
		ulong IO_ADDR_W = (ulong)nand;

		if (!(ctrl & NAND_CLE))
			IO_ADDR_W |= S3C2410_ADDR_NCLE;
		if (!(ctrl & NAND_ALE))
			IO_ADDR_W |= S3C2410_ADDR_NALE;

		chip->IO_ADDR_W = (void *)IO_ADDR_W;

		if (ctrl & NAND_NCE)
			writel(readl(&nand->nfconf) & ~S3C2410_NFCONF_nFCE,
			       &nand->nfconf);
		else
			writel(readl(&nand->nfconf) | S3C2410_NFCONF_nFCE,
			       &nand->nfconf);
	}

	if (cmd != NAND_CMD_NONE)
		writeb(cmd, chip->IO_ADDR_W);
#endif

#define NFCMMD	 (*(volatile unsigned char *)0xB0E00008)
#define NFADDR	 (*(volatile unsigned char *)0xB0E0000C)

	if (cmd != NAND_CMD_NONE) {
		if (ctrl & NAND_CLE) {
			NFCMMD = cmd;
			//printf ("cmd: %x\n", cmd);
			//writeb(cmd, NFCMMD);
		}
		else if (ctrl & NAND_ALE) {
			//writeb(cmd, NFADDR);
			NFADDR = cmd;
			//printf ("addr: %x\n", cmd);
		}
	}

}

5.make，使用命令下载到sd卡里，上电，观察控制台，可以看到，识别出了256M的nandflash了，以后就可以对nandflash进行操作了。