ram: sifive: Avoid using hardcoded ram base and size

At present the SiFive FU540 RAM driver uses hard-coded memory base
address and size to initialize the DDR controller. This may not be
true when this driver is used on another board based on FU540.

Update the driver to read the memory information from DT and use
that during the initialization.
Signed-off-by: NBin Meng <bin.meng@windriver.com>
Reviewed-by: NLeo Liang <ycliang@andestech.com>
Reviewed-by: NPragnesh Patel <pragnesh.patel@sifive.com>

drivers/ram/sifive/fu540_ddr.c

@@ -8,6 +8,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <fdtdec.h>
 #include <init.h>
 #include <ram.h>
 #include <regmap.h>
@@ -39,9 +40,6 @@
 #define DENALI_PHY_1152	1152
 #define DENALI_PHY_1214	1214
 
-#define PAYLOAD_DEST	0x80000000
-#define DDR_MEM_SIZE	(8UL * 1024UL * 1024UL * 1024UL)
-
 #define DRAM_CLASS_OFFSET			8
 #define DRAM_CLASS_DDR4				0xA
 #define OPTIMAL_RMODW_EN_OFFSET			0
@@ -65,6 +63,8 @@
 #define PHY_RX_CAL_DQ0_0_OFFSET			0
 #define PHY_RX_CAL_DQ1_0_OFFSET			16
 
+DECLARE_GLOBAL_DATA_PTR;
+
 struct fu540_ddrctl {
 	volatile u32 denali_ctl[265];
 };
@@ -235,8 +235,8 @@ static int fu540_ddr_setup(struct udevice *dev)
 	struct fu540_ddr_params *params = &plat->ddr_params;
 	volatile u32 *denali_ctl =  priv->ctl->denali_ctl;
 	volatile u32 *denali_phy =  priv->phy->denali_phy;
-	const u64 ddr_size = DDR_MEM_SIZE;
-	const u64 ddr_end = PAYLOAD_DEST + ddr_size;
+	const u64 ddr_size = priv->info.size;
+	const u64 ddr_end = priv->info.base + ddr_size;
 	int ret, i;
 	u32 physet;
 
@@ -302,7 +302,7 @@ static int fu540_ddr_setup(struct udevice *dev)
 		     | (1 << MULTIPLE_OUT_OF_RANGE_OFFSET));
 
 	/* set up range protection */
-	fu540_ddr_setup_range_protection(denali_ctl, DDR_MEM_SIZE);
+	fu540_ddr_setup_range_protection(denali_ctl, priv->info.size);
 
 	/* Mask off port command error interrupt DENALI_CTL_136 */
 	setbits_le32(DENALI_CTL_136 + denali_ctl,
@@ -314,14 +314,14 @@ static int fu540_ddr_setup(struct udevice *dev)
 
 	/* check size */
 	priv->info.size = get_ram_size((long *)priv->info.base,
-				       DDR_MEM_SIZE);
+				       ddr_size);
 
 	debug("%s : %lx\n", __func__, priv->info.size);
 
 	/* check memory access for all memory */
-	if (priv->info.size != DDR_MEM_SIZE) {
+	if (priv->info.size != ddr_size) {
 		printf("DDR invalid size : 0x%lx, expected 0x%lx\n",
-		       priv->info.size, DDR_MEM_SIZE);
+		       priv->info.size, (uintptr_t)ddr_size);
 		return -EINVAL;
 	}
 
@@ -333,6 +333,11 @@ static int fu540_ddr_probe(struct udevice *dev)
 {
 	struct fu540_ddr_info *priv = dev_get_priv(dev);
 
+	/* Read memory base and size from DT */
+	fdtdec_setup_mem_size_base();
+	priv->info.base = gd->ram_base;
+	priv->info.size = gd->ram_size;
+
 #if defined(CONFIG_SPL_BUILD)
 	struct regmap *map;
 	int ret;
@@ -368,14 +373,9 @@ static int fu540_ddr_probe(struct udevice *dev)
 	priv->phy = regmap_get_range(map, 1);
 	priv->physical_filter_ctrl = regmap_get_range(map, 2);
 
-	priv->info.base = CONFIG_SYS_SDRAM_BASE;
-
-	priv->info.size = 0;
 	return fu540_ddr_setup(dev);
-#else
-	priv->info.base = CONFIG_SYS_SDRAM_BASE;
-	priv->info.size = DDR_MEM_SIZE;
 #endif
+
 	return 0;
 }