sb/intel: Fix pointer casts

Fix some compiler warnings due to pointer to integer conversions
with different size.
Required for 64bit ramstage.

Change-Id: Ibfb3cacf25adfb4a242d38e4ea290fdc3929a684
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/29875
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/southbridge/intel/i82801ix/sata.c b/src/southbridge/intel/i82801ix/sata.c
index dcdeeb4..e35babc 100644
--- a/src/southbridge/intel/i82801ix/sata.c
+++ b/src/southbridge/intel/i82801ix/sata.c
@@ -30,9 +30,14 @@
 {
 	int i;
 	u32 reg32;
+	struct resource *res;
 
 	/* Initialize AHCI memory-mapped space */
-	u8 *abar = (u8 *)pci_read_config32(dev, PCI_BASE_ADDRESS_5);
+	res = find_resource(dev, PCI_BASE_ADDRESS_5);
+	if (!res)
+		return;
+
+	u8 *abar = res2mmio(res, 0, 0);
 	printk(BIOS_DEBUG, "ABAR: %p\n", abar);
 
 	/* Set AHCI access mode.