移植u-boot 1.1.6到TQ2440開發(fā)板-第四階段

增加Nand Flash的讀寫驅(qū)動

任務(wù)：移植nand- flash驅(qū)動，讓u - boot可以操作讀寫nand flash 。由于s3c2410 和s3c2440
nand flash 控制器有區(qū)別，所以修改以下代碼，讓u - boot可以操作讀寫nand flash 。

1、增加nand_flash.c文件:cpu/arm920t/s3c24x0/nand_flash.c

#include
#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
#include
#include
DECLARE_GLOBAL_DATA_PTR;
#define S3C2410_NFSTAT_READY(1<<0)
#define S3C2410_NFCONF_nFCE (1<<11)
#define S3C2440_NFSTAT_READY (1<<0)
#define S3C2440_NFCONT_nFCE (1<<1)

static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
{
S3C2410_NAN D * const s3c2410nand = S3C2410_GetBase_NAND();
if (chip == - 1)
{
s3c2410nand - >NFCONF |= S3C2410_NFCONF_nFCE;
}
else
{
s3c2410nand - >NFCONF &= ~S3C2410_NFCONF_nFCE;
}
}

static void s3c2410_nand_hwcontrol(struc t mtd_info *mtd, int cmd)
{
S3C2410_NAND * const s3c2410nand = S3C2410_GetBase_NAND();
struct nand_chip *chip = mtd- >priv;
switch (cmd)
{
case NAND_CTL_SETNCE:
case NAND_CTL_CLRNCE:
printf("%s: called for NCE n", __FUNCTION__);
break;
case NAND_CTL_SETCLE:
chip- >IO_ADDR_W = (void *)&s3c2410nand - >NFCMD;
break;
case NAND_CTL_SETALE:
chip- >IO_ADDR_W = (void *)&s3c2410nand - >NFADDR;
break;
default:
chip- >IO_ADDR_W = (void *)&s3c2410nand - >NFDATA;
break;
}
}

static int s3c2410_nand_devready(struct mtd_info *mtd)
{
S3C2410_NAND * const s3c2410nand = S3C2410_GetBase_NAND();
return (s3c2410nand - >NFSTAT & S3C2410_NFSTAT_READY);
}

static void s3c2440_nand_select_chip(struct mtd_info *mtd, int chip)
{
S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();
if (chip == - 1)
{
s3c2440nand - >NFCONT |= S3C2440_NFCONT_nFCE;
}
else
{
s3c2440nand - >NFCONT &= ~S3C2440_NFCONT_nFCE;
}
}

static void s3c2440_nand_hwcontrol(struct mtd_info *mtd,int cmd)
{
S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();
struct nand_chip *chip = mtd- >priv;
switch (cmd)
{
case NAND_CTL_SETNCE:
case NAND_CTL_CLRNCE:
printf("%s: called for NCE n", __FUNCTION__);
break;
case NAND_CTL_SETCLE:
chip- >IO_ADDR_W = (void *)&s3c2440nand - >NFCMD;
break;
case NAND_CTL_SETALE:
chip- >IO_ADDR_W = (void *)&s3c2440nand - >NFADDR;
break;
default:
chip- >IO_ADDR_W = (void *)&s3c2440nand - >NFDATA;
break;
}
}

static int s3c2440_nand_devready(struct mtd_info *mtd)
{
S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();
return (s3c2440nand - >NFSTAT & S3C2440_NFSTAT_READY);
}

static void s3c24x0_nand_inithw(void)
{
S3C2410_NAND * const s3c2410nand = S3C2410_GetBase_NAND();
S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();
#define TACLS0
#define TWRPH04
#define TWRPH12
if (gd - >bd- >bi_arch_number == MACH_TYPE_SMDK2410)
{

s3c2410nand - >NFCONF =
(1<<15)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0);
}
else
{

s3c2440nand - >NFCONF = (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4);

s3c2440nand - >NFCONT = (1<<4)|(0<<1)|(1<<0);
}
}

void board_nand_init(struct nand_chip *chip)
{
S3C2410_NAND * const s3c2410nand = S3C2410_GetBase_NAND();
S3C2440_NAND * const s3c2440nand = S3C2440_GetBase_NAND();
s3c24x0_nand_inithw();
if (gd - >bd- >bi_arch_number == MACH_TYPE_SMDK2410)
{
chip- >IO_ADDR_R = (void *)&s3c2410nand - >NFDATA;
chip- >IO_ADDR_W = (void *)&s3c2410nand - >NFDATA;
chip- >hwcontrol = s3c2410_nand_hwcontrol;
18
chip- >dev_ready = s3c2410_nand_devready;
chip- >select_chip = s3c2410_nand_select_chip;
chip- >options = 0;
}
else
{
chip- >IO_ADDR_R = (void *)&s3c2440nand - >NFDATA;
chip- >IO_ADDR_W = (void *)&s3c2440nand - >NFDATA;
chip- >hwcontrol = s3c2440_nand_hwcontrol;
chip- >dev_ready = s3c2440_nand_devready;
chip- >select_chip = s3c2440_nand_select_chip;
chip- >options = 0;
}
chip- >eccmode = NAND_ECC_SOFT;
}
#endif