mips: mtmips: add support to initialize SDRAM

This patch adds support for mtmips SoCs to initialize the SDRAM.

Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/mips/mach-mtmips/include/mach/ddr.h b/arch/mips/mach-mtmips/include/mach/ddr.h
index f921981..15ff66a 100644
--- a/arch/mips/mach-mtmips/include/mach/ddr.h
+++ b/arch/mips/mach-mtmips/include/mach/ddr.h
@@ -35,6 +35,9 @@
 struct mc_ddr_init_param {
 	void __iomem *memc;
 
+	u32 sdr_cfg0;
+	u32 sdr_cfg1;
+
 	u32 dq_dly;
 	u32 dqs_dly;
 
@@ -45,6 +48,7 @@
 	u32 bus_width;
 };
 
+void sdr_init(struct mc_ddr_init_param *param);
 void ddr1_init(struct mc_ddr_init_param *param);
 void ddr2_init(struct mc_ddr_init_param *param);
 void ddr_calibrate(void __iomem *memc, u32 memsize, u32 bw);