diff --git a/drivers/mmc/mv_sdhci.c b/drivers/mmc/mv_sdhci.c
index 9e59951..f92caeb 100644
--- a/drivers/mmc/mv_sdhci.c
+++ b/drivers/mmc/mv_sdhci.c
@@ -2,6 +2,33 @@
 #include <malloc.h>
 #include <sdhci.h>
 
+#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
+static struct sdhci_ops mv_ops;
+
+#if defined(CONFIG_SHEEVA_88SV331xV5)
+#define SD_CE_ATA_2	0xEA
+#define  MMC_CARD	0x1000
+#define  MMC_WIDTH	0x0100
+static inline void mv_sdhci_writeb(struct sdhci_host *host, u8 val, int reg)
+{
+	struct mmc *mmc = host->mmc;
+	u32 ata = (u32)host->ioaddr + SD_CE_ATA_2;
+
+	if (!IS_SD(mmc) && reg == SDHCI_HOST_CONTROL) {
+		if (mmc->bus_width == 8)
+			writew(readw(ata) | (MMC_CARD | MMC_WIDTH), ata);
+		else
+			writew(readw(ata) & ~(MMC_CARD | MMC_WIDTH), ata);
+	}
+
+	writeb(val, host->ioaddr + reg);
+}
+
+#else
+#define mv_sdhci_writeb	NULL
+#endif /* CONFIG_SHEEVA_88SV331xV5 */
+#endif /* CONFIG_MMC_SDHCI_IO_ACCESSORS */
+
 static char *MVSDH_NAME = "mv_sdh";
 int mv_sdh_init(u32 regbase, u32 max_clk, u32 min_clk, u32 quirks)
 {
@@ -15,6 +42,12 @@
 	host->name = MVSDH_NAME;
 	host->ioaddr = (void *)regbase;
 	host->quirks = quirks;
+#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
+	memset(&mv_ops, 0, sizeof(struct sdhci_ops));
+	if (mv_sdhci_writeb != NULL)
+		mv_ops.write_b = mv_sdhci_writeb;
+	host->ops = &mv_ops;
+#endif
 	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
 	add_sdhci(host, max_clk, min_clk);
 	return 0;