amd/stoneyridge: Add PSP definitions southbridge and iomap

Define the PSP's BAR3 and BAR3 enable bit.  Define a default base
address for BAR3.

Change-Id: I59a0ec59b7c6bbc6468b3096ec8d025832349f44
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22250
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/amd/stoneyridge/include/soc/iomap.h

@@ -18,6 +18,7 @@
 #define __SOC_STONEYRIDGE_IOMAP_H__
 
 /* MMIO Ranges */
+#define PSP_MAILBOX_BAR3_BASE		0xf0a00000
 #define SPI_BASE_ADDRESS		0xfec10000
 #define IO_APIC2_ADDR			0xfec20000
 

src/soc/amd/stoneyridge/include/soc/southbridge.h

@@ -21,9 +21,15 @@
 #include <types.h>
 #include <device/pci_ids.h>
 #include <device/device.h>
+#include <device/pci_def.h>
 #include <soc/iomap.h>
 #include "chip.h"
 
+/* PSP at D8F0 */
+#define PSP_MAILBOX_BAR			PCI_BASE_ADDRESS_4 /* BKDG: "BAR3" */
+#define PSP_BAR_ENABLES			0x48
+#define  PSP_MAILBOX_BAR_EN		0x10
+
 /* Power management index/data registers */
 #define BIOSRAM_INDEX			0xcd4
 #define BIOSRAM_DATA			0xcd5