SDBP
OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP)
OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP