rockchip: mmc: get the fifo mode and fifo depth property from dts

rk3036 mmc do not have internal dma, so we use fifo mode when read
and write data, we get the fifo mode and fifo depth property from
dts, pass to dw_mmc driver.

Signed-off-by: Lin Huang <hl@rock-chips.com>

arch/arm/dts/rk3036.dtsi

@@ -257,6 +257,7 @@
 		cap-mmc-highspeed;
 		mmc-ddr-1_8v;
 		disable-wp;
+		fifo-mode;
 		non-removable;
 		num-slots = <1>;
 		default-sample-phase = <158>;

drivers/mmc/rockchip_dw_mmc.c

@@ -64,6 +64,7 @@ static int rockchip_dwmmc_probe(struct udevice *dev)
 	struct dwmci_host *host = &priv->host;
 	u32 minmax[2];
 	int ret;
+	int fifo_depth;
 
 	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
 	if (IS_ERR(priv->grf))
@@ -72,10 +73,22 @@ static int rockchip_dwmmc_probe(struct udevice *dev)
 	if (ret)
 		return ret;
 
-	ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset,
-				   "clock-freq-min-max", minmax, 2);
-	if (!ret)
-		ret = add_dwmci(host, minmax[1], minmax[0]);
+	if (fdtdec_get_int_array(gd->fdt_blob, dev->of_offset,
+				 "clock-freq-min-max", minmax, 2))
+		return -EINVAL;
+
+	fifo_depth = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+				    "fifo-depth", 0);
+	if (fifo_depth < 0)
+		return -EINVAL;
+
+	host->fifoth_val = MSIZE(0x2) |
+		RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth / 2);
+
+	if (fdtdec_get_bool(gd->fdt_blob, dev->of_offset, "fifo-mode"))
+		host->fifo_mode = true;
+
+	ret = add_dwmci(host, minmax[1], minmax[0]);
 	if (ret)
 		return ret;