s5pv210 uboot-2012-10移植(七) 之支持SD卡

我其实对SD卡的操作不是很熟悉，所以移植的肯定有问题，在随机赠送的Kingston 4G的SD卡上可以进行读写，但是我换了张2G的SD卡，就不行了，原因暂时先不找了，等熟悉了SD卡的操作再看看，哪位大侠知道怎么移植的一定要告诉我，不胜感激。

1.include/configs/smdkv210.h +94

#define CONFIG_GENERIC_MMC
#define CONFIG_MMC
#define CONFIG_SDHCI
#define CONFIG_S5P_SDHCI
#define CONFIG_CMD_MMC

2.在board/samsung/smdkv210/smdkc100.c添加

int board_mmc_init (bd_t *bis)
{
//printf ("haha\n");
#define GPG0CON  (*(volatile unsigned int *)0xE02001A0)
#define GPG0DRV  (*(volatile unsigned int *)0xE02001AC)
#define GPG3CON  (*(volatile unsigned int *)0xE0200200)
#define CLK_DIV4 (*(volatile unsigned int *)0xE0100310)
#define CLK_SRC4 (*(volatile unsigned int *)0xE0100210)
#define MOUTMMC (50000000) /* 50MHz */

unsigned long clk_src, clk_div, mpll, div;

//初始化MMC0 MM3管脚，4bit模式
GPG0CON = (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16)|(0x2<<20)|(0x2<<24);
GPG3CON = (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16)|(0x2<<20)|(0x2<<24);
//GPG0DRV = 0x3fdf;

//初始化SD时钟
clk_src = CLK_SRC4;
clk_src &= ~((0xf << 12) | 0xf);
clk_src |= (0x6 << 12) | 0x6;

mpll = get_pll_clk(MPLL);
div = ((mpll + MOUTMMC) / MOUTMMC) - 1;

clk_div = CLK_DIV4;
clk_div &= ~((0xf << 12) | 0xf);
clk_div |= (div << 12) | div;

CLK_SRC4 = clk_src;
CLK_DIV4 = clk_div;

return s5p_sdhci_init(0xEB000000, 0, 4)|s5p_sdhci_init(0xEB300000, 1, 4);
}

3.修改drivers/mmc/sdhci.c +133

/* Wait max 10 ms */
timeout = 10;
#if 0
sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;

/* We shouldn't wait for data inihibit for stop commands, even
though they might use busy signaling */
if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
mask &= ~SDHCI_DATA_INHIBIT;
#endif

/*
* PRNSTS
* CMDINHDAT[1] : Command Inhibit (DAT)
* CMDINHCMD[0] : Command Inhibit (CMD)
*/
mask = (1 << 0);
if ((data != NULL) || (cmd->resp_type & MMC_RSP_BUSY))
mask |= (1 << 1);

/*
* We shouldn't wait for data inihibit for stop commands, even
* though they might use busy signaling
*/
if (data)
mask &= ~(1 << 1);

//mask = 1;
//printf ("mask: %08x\n  read: %08x\n", mask, sdhci_readl(host, SDHCI_PRESENT_STATE));
while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
if (timeout == 0) {
printf("Controller never released inhibit bit(s).\n");
return COMM_ERR;
}
timeout--;
udelay(1000);
}

4.修改drivers/mmc/mmc.c把sd_change_freq中的最后两个returne err; 给屏蔽掉

//if (err)
//return err;

5.make，使用命令烧入SD卡里，启动开发板