uniphier: allocate xlat region of on-chip SRAM only when needed

Currently, the xlat region of the on-chip SRAM is always allocated
for all BL images.

The access to the on-chip SRAM is necessary for loading images from
a USB memory device (i.e. when updating firmware), so unneeded for
the usual boot procedure.

To avoid this waste, allocate the xlat region dynamically only for
BL2, and only when it is necessary.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

plat/socionext/uniphier/uniphier_io_storage.c

@@ -21,6 +21,9 @@
 #define UNIPHIER_ROM_REGION_BASE	0x00000000
 #define UNIPHIER_ROM_REGION_SIZE	0x10000000
 
+#define UNIPHIER_OCM_REGION_BASE	0x30000000
+#define UNIPHIER_OCM_REGION_SIZE	0x00040000
+
 static const io_dev_connector_t *uniphier_fip_dev_con;
 static uintptr_t uniphier_fip_dev_handle;
 
@@ -271,6 +274,18 @@ static int uniphier_io_usb_setup(unsigned int soc_id)
 	if (ret)
 		return ret;
 
+	/*
+	 * on-chip SRAM region: should be DEVICE attribute because the USB
+	 * load functions provided by the ROM use this memory region as a work
+	 * area, but do not cater to cache coherency.
+	 */
+	ret = mmap_add_dynamic_region(UNIPHIER_OCM_REGION_BASE,
+				      UNIPHIER_OCM_REGION_BASE,
+				      UNIPHIER_OCM_REGION_SIZE,
+				      MT_DEVICE | MT_RW | MT_SECURE);
+	if (ret)
+		return ret;
+
 	ret = uniphier_usb_init(soc_id, &block_dev_spec);
 	if (ret)
 		return ret;

plat/socionext/uniphier/uniphier_xlat_setup.c

@@ -8,9 +8,6 @@
 #include <platform_def.h>
 #include <xlat_tables_v2.h>
 
-#define UNIPHIER_OCM_REGION_BASE	0x30000000
-#define UNIPHIER_OCM_REGION_SIZE	0x00040000
-
 #define UNIPHIER_REG_REGION_BASE	0x50000000
 #define UNIPHIER_REG_REGION_SIZE	0x20000000
 
@@ -37,15 +34,6 @@ void uniphier_mmap_setup(uintptr_t total_base, size_t total_size,
 			BL_COHERENT_RAM_END - BL_COHERENT_RAM_BASE,
 			MT_DEVICE | MT_RW | MT_SECURE);
 
-	/*
-	 * on-chip SRAM region: should be DEVICE attribute because the USB
-	 * load functions provided by the ROM use this memory region as a work
-	 * area, but do not cater to cache coherency.
-	 */
-	mmap_add_region(UNIPHIER_OCM_REGION_BASE, UNIPHIER_OCM_REGION_BASE,
-			UNIPHIER_OCM_REGION_SIZE,
-			MT_DEVICE | MT_RW | MT_SECURE);
-
 	/* register region */
 	mmap_add_region(UNIPHIER_REG_REGION_BASE, UNIPHIER_REG_REGION_BASE,
 			UNIPHIER_REG_REGION_SIZE,