staging: mt7621-mmc: Remove DMA basic mode code

The driver currently only uses DMA linked mode and the upstream
driver does the same, so remove the basic mode code.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -1040,25 +1040,6 @@ static void msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
 	struct gpd *gpd;
 	struct bd *bd;
 
-	switch (dma->mode) {
-	case MSDC_MODE_DMA_BASIC:
-		BUG_ON(host->xfer_size > 65535);
-		BUG_ON(dma->sglen != 1);
-		writel(PHYSADDR(sg_dma_address(sg)), MSDC_DMA_SA);
-		sdr_set_field(MSDC_DMA_CTRL, MSDC_DMA_CTRL_LASTBUF, 1);
-//#if defined (CONFIG_RALINK_MT7620)
-		if (ralink_soc == MT762X_SOC_MT7620A)
-			sdr_set_field(MSDC_DMA_CTRL, MSDC_DMA_CTRL_XFERSZ, sg_dma_len(sg));
-//#elif defined (CONFIG_RALINK_MT7621) || defined (CONFIG_RALINK_MT7628)
-		else
-			writel(sg_dma_len(sg), (void __iomem *)(RALINK_MSDC_BASE + 0xa8));
-//#endif
-		sdr_set_field(MSDC_DMA_CTRL, MSDC_DMA_CTRL_BRUSTSZ,
-			      MSDC_BRUST_64B);
-		sdr_set_field(MSDC_DMA_CTRL, MSDC_DMA_CTRL_MODE, 0);
-		break;
-	case MSDC_MODE_DMA_DESC:
-
 	/* calculate the required number of gpd */
 	num = (dma->sglen + MAX_BD_PER_GPD - 1) / MAX_BD_PER_GPD;
 	BUG_ON(num != 1);
@@ -1095,11 +1076,6 @@ static void msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
 	sdr_set_field(MSDC_DMA_CTRL, MSDC_DMA_CTRL_MODE, 1);
 
 	writel(PHYSADDR((u32)dma->gpd_addr), MSDC_DMA_SA);
-		break;
-
-	default:
-		break;
-	}
 
 	N_MSG(DMA, "DMA_CTRL = 0x%x", readl(MSDC_DMA_CTRL));
 	N_MSG(DMA, "DMA_CFG  = 0x%x", readl(MSDC_DMA_CFG));