+ if (host->flags & SDHCI_REQ_USE_DMA) {
+ if (host->flags & SDHCI_USE_ADMA) {
+ ret = sdhci_adma_table_pre(host, data);
+ if (ret) {
+ /*
+ * This only happens when someone fed
+ * us an invalid request.
+ */
+ WARN_ON(1);
+ host->flags &= ~SDHCI_USE_DMA;
+ } else {
+ writel(host->adma_addr,
+ host->ioaddr + SDHCI_ADMA_ADDRESS);
+ }
+ } else {
+ int count;
+
+ count = dma_map_sg(mmc_dev(host->mmc),
+ data->sg, data->sg_len,
+ (data->flags & MMC_DATA_READ) ?
+ DMA_FROM_DEVICE :
+ DMA_TO_DEVICE);
+ if (count == 0) {
+ /*
+ * This only happens when someone fed
+ * us an invalid request.
+ */
+ WARN_ON(1);
+ host->flags &= ~SDHCI_USE_DMA;
+ } else {
+ WARN_ON(count != 1);
+ writel(sg_dma_address(data->sg),
+ host->ioaddr + SDHCI_DMA_ADDRESS);
+ }
+ }
+ }
+