allwinner: Detect and output current SoC
So far we already support booting on two different SoCs, and we will
shortly add a third, so add some code to determine the current SoC type.
This can be later used to runtime detect certain properties.
Also print the SoC name to the console, to give valuable debug information.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/allwinner/common/sunxi_common.c b/plat/allwinner/common/sunxi_common.c
index 9069a17..fc9bf20 100644
--- a/plat/allwinner/common/sunxi_common.c
+++ b/plat/allwinner/common/sunxi_common.c
@@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-3-Clause
*/
+#include <mmio.h>
#include <platform.h>
#include <platform_def.h>
#include <sunxi_def.h>
@@ -54,3 +55,19 @@
enable_mmu_el3(0);
}
+
+#define SRAM_VER_REG (SUNXI_SYSCON_BASE + 0x24)
+uint16_t sunxi_read_soc_id(void)
+{
+ uint32_t reg = mmio_read_32(SRAM_VER_REG);
+
+ /* Set bit 15 to prepare for the SOCID read. */
+ mmio_write_32(SRAM_VER_REG, reg | BIT(15));
+
+ reg = mmio_read_32(SRAM_VER_REG);
+
+ /* deactivate the SOCID access again */
+ mmio_write_32(SRAM_VER_REG, reg & ~BIT(15));
+
+ return reg >> 16;
+}