ram: starfive: Read memory size information from EEPROM

StarFive VisionFive 2 has two versions, 1.2A and 1.3B, each version of
DDR capacity includes 2G/4G/8G, a DT can not support multiple
capacities, so the capacity size information is recorded to EEPROM, when
DDR initialization required capacity size information is read from
EEPROM.

If there is no information in EEPROM, it is initialized with the default
size defined in DT.

Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

2 files changed, 31 insertions, 3 deletions

diff --git a/arch/riscv/cpu/jh7110/spl.c b/arch/riscv/cpu/jh7110/spl.c
index 104f0fe..72adcef 100644
--- a/arch/riscv/cpu/jh7110/spl.c
+++ b/arch/riscv/cpu/jh7110/spl.c
@@ -3,19 +3,49 @@
  * Copyright (C) 2022 StarFive Technology Co., Ltd.
  * Author: Yanhong Wang<yanhong.wang@starfivetech.com>
  */
-
+#include <common.h>
+#include <asm/arch/eeprom.h>
 #include <asm/csr.h>
 #include <asm/sections.h>
 #include <dm.h>
+#include <linux/sizes.h>
 #include <log.h>
+#include <init.h>
 
 #define CSR_U74_FEATURE_DISABLE	0x7c1
 #define L2_LIM_MEM_END	0x81FFFFFUL
 
+DECLARE_GLOBAL_DATA_PTR;
+
+static bool check_ddr_size(phys_size_t size)
+{
+	switch (size) {
+	case SZ_2:
+	case SZ_4:
+	case SZ_8:
+	case SZ_16:
+		return true;
+	default:
+		return false;
+	}
+}
+
 int spl_soc_init(void)
 {
 	int ret;
 	struct udevice *dev;
+	phys_size_t size;
+
+	ret = fdtdec_setup_mem_size_base();
+	if (ret)
+		return ret;
+
+	/* Read the definition of the DDR size from eeprom, and if not,
+	 * use the definition in DT
+	 */
+	size = (get_ddr_size_from_eeprom() >> 16) & 0xFF;
+	if (check_ddr_size(size))
+		gd->ram_size = size << 30;
 
 	/* DDR init */
 	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
diff --git a/drivers/ram/starfive/starfive_ddr.c b/drivers/ram/starfive/starfive_ddr.c
index 553f2ce..a0a3d6b 100644
--- a/drivers/ram/starfive/starfive_ddr.c
+++ b/drivers/ram/starfive/starfive_ddr.c
@@ -72,8 +72,6 @@ static int starfive_ddr_probe(struct udevice *dev)
 	u64 rate;
 	int ret;
 
-	/* Read memory base and size from DT */
-	fdtdec_setup_mem_size_base();
 	priv->info.base = gd->ram_base;
 	priv->info.size = gd->ram_size;