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

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

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。