arm: mvebu: Add complete SDRAM ECC scrubbing

This patch introduces the SDRAM scrubbing for ECC enabled board
to fill/initialize the ECC bytes. This is done via the XOR engine
to speed up the process. The scrubbing is a 2-stage process:

1) SPL scrubs the area 0 - 0x100.0000 (16MiB) for the main U-Boot
2) U-Boot scrubs the remaining SDRAM area(s)

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>

drivers/ddr/marvell/axp/xor.c

@@ -18,7 +18,6 @@ static u32 xor_regs_ctrl_backup;
 static u32 xor_regs_base_backup[MAX_CS];
 static u32 xor_regs_mask_backup[MAX_CS];
 
-static void mv_xor_hal_init(u32 chan_num);
 static int mv_xor_cmd_set(u32 chan, int command);
 static int mv_xor_ctrl_set(u32 chan, u32 xor_ctrl);
 
@@ -110,7 +109,7 @@ void mv_sys_xor_finish(void)
  * RETURN:
  *       MV_BAD_PARAM if parameters to function invalid, MV_OK otherwise.
  */
-static void mv_xor_hal_init(u32 chan_num)
+void mv_xor_hal_init(u32 chan_num)
 {
 	u32 i;
 

drivers/ddr/marvell/axp/xor.h

@@ -60,6 +60,7 @@ struct crc_dma_desc {
 	u32 src_addr1;		/* Mode: Source Block address pointer */
 } __packed;
 
+void mv_xor_hal_init(u32 chan_num);
 int mv_xor_state_get(u32 chan);
 void mv_sys_xor_init(MV_DRAM_INFO *dram_info);
 void mv_sys_xor_finish(void);