[PATCH v1 3/5] ddr: altera: gen5: Add DRAM size checking

[alif.zakuan.yuslaimi at altera.com]

From: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi at altera.com>

Add DRAM size checking compare between size from device tree and actual
hardware.

Trigger hang if DRAM size from device tree is greater than actual hardware.
Display warning message if DRAM size mismatch between device tree and
actual hardware.

get_ram_size() uses size from device tree. So, it has consistency with
other device families.

Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi at altera.com>
---
 drivers/ddr/altera/sdram_gen5.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/ddr/altera/sdram_gen5.c b/drivers/ddr/altera/sdram_gen5.c
index 7a0a043557b..d5892850da7 100644
--- a/drivers/ddr/altera/sdram_gen5.c
+++ b/drivers/ddr/altera/sdram_gen5.c
@@ -6,6 +6,7 @@
 #include <dm.h>
 #include <errno.h>
 #include <div64.h>
+#include <hang.h>
 #include <init.h>
 #include <log.h>
 #include <ram.h>
@@ -615,6 +616,22 @@ static int altera_gen5_sdram_probe(struct udevice *dev)
 	sdram_size = sdram_calculate_size(sdr_ctrl);
 	debug("SDRAM: %ld MiB\n", sdram_size >> 20);
 
+	/* setup the dram info within bd */
+	dram_init_banksize();
+
+	if (sdram_size != gd->bd->bi_dram[0].size) {
+		printf("DDR: Warning: DRAM size from device tree (%d MiB)\n",
+		       (u32)(gd->bd->bi_dram[0].size >> 20));
+		printf(" mismatch with hardware (%d MiB).\n",
+		       (u32)(sdram_size >> 20));
+	}
+
+	if (gd->bd->bi_dram[0].size > sdram_size) {
+		printf("DDR: Error: DRAM size from device tree is greater\n");
+		printf(" than hardware size.\n");
+		hang();
+	}
+
 	if (sdram_is_ecc_enabled(sdr_ctrl)) {
 		/* Must set USEECCASDATA to 0 if ECC is enabled */
 		clrbits_le32(&sdr_ctrl->static_cfg,
@@ -623,7 +640,8 @@ static int altera_gen5_sdram_probe(struct udevice *dev)
 	}
 
 	/* Sanity check ensure correct SDRAM size specified */
-	if (get_ram_size(0, sdram_size) != sdram_size) {
+	if (get_ram_size(0, gd->bd->bi_dram[0].size) !=
+			 gd->bd->bi_dram[0].size) {
 		puts("SDRAM size check failed!\n");
 		goto failed;
 	}
-- 
2.43.7