Fix ULI RTC support on MPC8544 DS

The RTC on the M1575 ULI chipset requires a dummy read before
we are able to talk to the RTC.  We accomplish this by adding a
second memory region to the PHB the ULI is on and read from it.

The second region is added to maintain compatiabilty with Linux's
view of the PCI memory map.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/freescale/mpc8544ds/init.S

@@ -237,6 +237,6 @@ law_entry:
 
 	/* contains both PCIE3 MEM & IO space */
 	.long	(CFG_PCIE3_MEM_PHYS>>12) & 0xfffff
-	.long	LAWAR_EN | LAWAR_TRGT_PCIE3 | (LAWAR_SIZE & LAWAR_SIZE_2M)
+	.long	LAWAR_EN | LAWAR_TRGT_PCIE3 | (LAWAR_SIZE & LAWAR_SIZE_4M)
 4:
 	entry_end

board/freescale/mpc8544ds/mpc8544ds.c

@@ -26,6 +26,7 @@
 #include <asm/processor.h>
 #include <asm/immap_85xx.h>
 #include <asm/immap_fsl_pci.h>
+#include <asm/io.h>
 #include <spd.h>
 #include <miiphy.h>
 
@@ -222,6 +223,11 @@ pci_init_board(void)
 		printf ("    PCIE3 on bus %02x - %02x\n",
 			hose->first_busno,hose->last_busno);
 
+		/*
+		 * Activate ULI1575 legacy chip by performing a fake
+		 * memory access.  Needed to make ULI RTC work.
+		 */
+		in_be32(CFG_PCIE3_MEM_BASE);
 	} else {
 		printf ("    PCIE3: disabled\n");
 	}

include/configs/MPC8544DS.h

@@ -310,6 +310,9 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 #define CFG_PCIE3_IO_BASE	0x00000000
 #define CFG_PCIE3_IO_PHYS	0xb0100000	/* reuse mem LAW */
 #define CFG_PCIE3_IO_SIZE	0x00100000	/* 1M */
+#define CFG_PCIE3_MEM_BASE2	0xb0200000
+#define CFG_PCIE3_MEM_PHYS2	CFG_PCIE3_MEM_BASE2
+#define CFG_PCIE3_MEM_SIZE2	0x00200000	/* 1M */
 
 #if defined(CONFIG_PCI)