OK6410（256M RAM ，1G SLC NAND）Uboot-2013-04移植（3）--SD卡启动MMC驱动

1. 在driver/mmc/目录下新建s3c6410-sdhci.c，内容如下

/*
 * Samsung S3C6410 SD/MMC driver
 * Based on sdhci.c
 * Author: LiQiang  E-mail: [e-mail]
 * Licensed under the GPL-2 or later.
 */

#include <common.h>
#include <malloc.h>
#include <sdhci.h>
#include <asm/arch/s3c6410.h>

#ifdef  CONFIG_MMC_CHANNEL
#define MMC_CHANNEL CONFIG_MMC_CHANNEL
#else
#define    MMC_CHANNEL 0
#endif

#define ELFIN_HSMMC_BASE    0x7C200000
#define MMC_REGS_BASE        (ELFIN_HSMMC_BASE + 0x100000*MMC_CHANNEL)


static void sdhc_set_gpio()
{
    u32 reg;
#if (MMC_CHANNEL == 0)
    reg = readl(GPGCON) & 0xf0000000;
    writel(reg | 0x02222222, GPGCON);

    reg = readl(GPGPUD) & 0xfffff000;
    writel(reg, GPGPUD);
#elif (MMC_CHANNEL == 1)
    writel(0x00222222, GPHCON0);
    writel(0x00000000, GPHCON1);

    reg = readl(GPHPUD) & 0xfffff000;
    writel(reg, GPHPUD);
#else
    printf("#####err: SDMMC channel is not defined!\n");
#endif
}

int s3c_sdhci_init(u32 regbase, u32 max_clk, u32 min_clk, u32 quirks)
{
    struct sdhci_host *host = NULL;
    host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host));
    if (!host) {
        printf("#####err: sdhci_host malloc fails!\n");
        return 1;
    }
    sdhc_set_gpio();
    host->name = "Samsung  Host Controller";
    host->ioaddr = (void *)regbase;
    host->quirks = quirks;


    host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
    if (quirks & SDHCI_QUIRK_REG32_RW)
        host->version = sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16;
    else
        host->version = sdhci_readw(host, SDHCI_HOST_VERSION);

    host->host_caps = MMC_MODE_HC;

    add_sdhci(host, max_clk, min_clk);
    return 0;
}



int board_mmc_init(bd_t *bis)
{
    return s3c_sdhci_init(MMC_REGS_BASE, 52000000, 400000, 0);
}

2. 修改driver/mmc/Makefile，添加COBJS-$(CONFIG_S3C6410_SDHCI) += s3c6410_sdhci.o

3.修改driver/mmc/sdhci.c，注释掉167行的mask |= SDHCI_INT_DATA_END;

    在491行sdhci_reset(host, SDHCI_RESET_ALL);之前添加mmc->b_max = 1024;

4.修改include/configs/smdk6410.h，添加

/*support for mmc*/
#define CONFIG_MMC
#define CONFIG_GENERIC_MMC
#define CONFIG_CMD_MMC
#define CONFIG_SDHCI
#define CONFIG_MMC_SDMA
#define CONFIG_S3C6410_SDHCI

5.重新make all，重新烧录到SD卡，在dnw中输入mmcinfo，显示结果如下