support DDR

arch/arm/kernel/tcm.c

@@ -17,6 +17,9 @@
 #include <asm/cputype.h>
 #include <asm/mach/map.h>
 #include <mach/memory.h>
+#ifdef CONFIG_ARCH_RK2818
+#include <mach/rk2818_iomap.h>
+#endif
 #include "tcm.h"
 
 /* Scream and warn about misuse */
@@ -51,7 +54,11 @@ static struct resource itcm_res = {
 static struct map_desc dtcm_iomap[] __initdata = {
 	{
 		.virtual	= DTCM_OFFSET,
+#ifdef CONFIG_ARCH_RK2818
+		.pfn		= __phys_to_pfn(RK2818_SRAM_PHYS),
+#else
 		.pfn		= __phys_to_pfn(DTCM_OFFSET),
+#endif
 		.length		= (DTCM_END - DTCM_OFFSET + 1),
 		.type		= MT_UNCACHED
 	}

arch/arm/mach-rk2818/Makefile

@@ -4,6 +4,7 @@ obj-y += proc_comm.o
 obj-y += vreg.o
 obj-y += clock.o
 obj-$(CONFIG_CPU_FREQ) += cpufreq.o
+obj-y += ddr.o
 obj-y += dma.o
 obj-$(CONFIG_RK28_ADC) += adc.o
 obj-$(CONFIG_MACH_RK2818MID) += board-midsdk.o

arch/arm/mach-rk2818/clock.c

@@ -1203,6 +1203,15 @@ static void recalculate_root_clocks(void)
 	}
 }
 
+void clk_recalculate_root_clocks(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clockfw_lock, flags);
+	recalculate_root_clocks();
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+
 /**
  * clk_preinit - initialize any fields in the struct clk before clk init
  * @clk: struct clk * to initialize

arch/arm/mach-rk2818/include/mach/memory.h

@@ -29,7 +29,8 @@
 #define ITCM_OFFSET	0xff400000
 #define ITCM_END	0xff401fff
 #define DTCM_OFFSET	0xff404000
-#define DTCM_END	0xff407fff
+#define DTCM_END	0xff404fff	// use sram for dtcm,sram length = 4K.
+/* #define DTCM_END	0xff407fff */
 
 #endif