board: starfive: evb: Add resize-ddr function

Add board-level resize-DDR function for evb

Signed-off-by: Samin Guo <samin.guo@starfivetech.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/board/starfive/evb/starfive_evb.c b/board/starfive/evb/starfive_evb.c
index 6e3fc641ba..493f4394ca 100644
--- a/board/starfive/evb/starfive_evb.c
+++ b/board/starfive/evb/starfive_evb.c
@@ -302,3 +302,50 @@ err:
 
 }
 
+#ifdef CONFIG_ID_EEPROM
+
+#include <asm/arch/eeprom.h>
+#define STARFIVE_JH7110_EEPROM_DDRINFO_OFFSET	91
+
+static bool check_eeprom_dram_info(ulong size)
+{
+	switch (size) {
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+	case 16:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static int resize_ddr_from_eeprom(void)
+{
+	ulong size;
+	u32 len = 1;
+	u8 data = 0;
+	int ret;
+
+	/* read memory size info */
+	ret = get_data_from_eeprom(STARFIVE_JH7110_EEPROM_DDRINFO_OFFSET, len, &data);
+	if (ret == len) {
+		size = hextoul(&data, NULL);
+		if (check_eeprom_dram_info(size))
+			return size;
+	}
+	return 0;
+}
+#else
+static int resize_ddr_from_eeprom(void)
+{
+	return 0;
+}
+#endif /* CONFIG_ID_EEPROM */
+
+int board_ddr_size(void)
+{
+	return resize_ddr_from_eeprom();
+}
+