Merge branch 'master' of git://git.denx.de/u-boot-marvell

[karo-tx-uboot.git] / arch / arm / cpu / arm926ejs / kirkwood / dram.c

diff --git a/arch/arm/cpu/arm926ejs/kirkwood/dram.c b/arch/arm/cpu/arm926ejs/kirkwood/dram.c
index 8f2a18af6b3742ad90251b84103e65429e622484..2441554ae3c011c1ae062734dc8369544adf431d 100644 (file)
--- a/arch/arm/cpu/arm926ejs/kirkwood/dram.c
+++ b/arch/arm/cpu/arm926ejs/kirkwood/dram.c
@@ -23,8 +23,11 @@
  */
 
 #include <config.h>
+#include <common.h>
 #include <asm/arch/kirkwood.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #define KW_REG_CPUCS_WIN_BAR(x)                (KW_REGISTER(0x1500) + (x * 0x08))
 #define KW_REG_CPUCS_WIN_SZ(x)         (KW_REGISTER(0x1504) + (x * 0x08))
 /*
@@ -56,3 +59,47 @@ u32 kw_sdram_bs(enum memory_bank bank)
        result += 0x01000000;
        return result;
 }
+
+#ifndef CONFIG_SYS_BOARD_DRAM_INIT
+int dram_init(void)
+{
+       int i;
+
+       gd->ram_size = 0;
+       for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+               gd->bd->bi_dram[i].start = kw_sdram_bar(i);
+               gd->bd->bi_dram[i].size = kw_sdram_bs(i);
+               /*
+                * It is assumed that all memory banks are consecutive
+                * and without gaps.
+                * If the gap is found, ram_size will be reported for
+                * consecutive memory only
+                */
+               if (gd->bd->bi_dram[i].start != gd->ram_size)
+                       break;
+
+               gd->ram_size += gd->bd->bi_dram[i].size;
+
+       }
+
+       for (; i < CONFIG_NR_DRAM_BANKS; i++) {
+               /* If above loop terminated prematurely, we need to set
+                * remaining banks' start address & size as 0. Otherwise other
+                * u-boot functions and Linux kernel gets wrong values which
+                * could result in crash */
+               gd->bd->bi_dram[i].start = 0;
+               gd->bd->bi_dram[i].size = 0;
+       }
+
+       return 0;
+}
+
+/*
+ * If this function is not defined here,
+ * board.c alters dram bank zero configuration defined above.
+ */
+void dram_init_banksize(void)
+{
+       dram_init();
+}
+#endif /* CONFIG_SYS_BOARD_DRAM_INIT */