diff --git a/arch/arm/mach-socfpga/include/mach/sdram_s10.h b/arch/arm/mach-socfpga/include/mach/sdram_s10.h
index 91bfc0e..ca68594 100644
--- a/arch/arm/mach-socfpga/include/mach/sdram_s10.h
+++ b/arch/arm/mach-socfpga/include/mach/sdram_s10.h
@@ -7,7 +7,7 @@
 #ifndef	_SDRAM_S10_H_
 #define	_SDRAM_S10_H_
 
-unsigned long sdram_calculate_size(void);
+phys_size_t sdram_calculate_size(void);
 int sdram_mmr_init_full(unsigned int sdr_phy_reg);
 int sdram_calibration_full(void);
 
diff --git a/drivers/ddr/altera/sdram_s10.c b/drivers/ddr/altera/sdram_s10.c
index 48f4f47..a48567c 100644
--- a/drivers/ddr/altera/sdram_s10.c
+++ b/drivers/ddr/altera/sdram_s10.c
@@ -371,11 +371,11 @@ int sdram_mmr_init_full(unsigned int unused)
  * Calculate SDRAM device size based on SDRAM controller parameters.
  * Size is specified in bytes.
  */
-unsigned long sdram_calculate_size(void)
+phys_size_t sdram_calculate_size(void)
 {
 	u32 dramaddrw = hmc_readl(DRAMADDRW);
 
-	u32 size = 1 << (DRAMADDRW_CFG_CS_ADDR_WIDTH(dramaddrw) +
+	phys_size_t size = 1 << (DRAMADDRW_CFG_CS_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_BANK_GRP_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_BANK_ADDR_WIDTH(dramaddrw) +
 			 DRAMADDRW_CFG_ROW_ADDR_WIDTH(dramaddrw) +