arm: socfpga: Convert Altera DDR SDRAM driver to use Kconfig

Convert Altera DDR SDRAM driver to use Kconfig method.
Enable ALTERA_SDRAM by default if it is on Gen5 target.
Arria 10 will have different driver.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>

arch/arm/mach-socfpga/Kconfig

@@ -43,6 +43,7 @@ config TARGET_SOCFPGA_CYCLONE5
 
 config TARGET_SOCFPGA_GEN5
 	bool
+	select ALTERA_SDRAM
 
 choice
 	prompt "Altera SOCFPGA board select"

drivers/Kconfig

@@ -14,6 +14,8 @@ source "drivers/cpu/Kconfig"
 
 source "drivers/crypto/Kconfig"
 
+source "drivers/ddr/Kconfig"
+
 source "drivers/demo/Kconfig"
 
 source "drivers/ddr/fsl/Kconfig"

drivers/ddr/Kconfig

@@ -0,0 +1 @@
+source "drivers/ddr/altera/Kconfig"

drivers/ddr/altera/Kconfig

@@ -0,0 +1,5 @@
+config ALTERA_SDRAM
+	bool "SoCFPGA DDR SDRAM driver"
+	depends on TARGET_SOCFPGA_GEN5
+	help
+	  Enable DDR SDRAM controller for the SoCFPGA devices.

drivers/ddr/altera/Makefile

@@ -8,4 +8,6 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-$(CONFIG_ALTERA_SDRAM) += sdram.o sequencer.o
+ifdef CONFIG_ALTERA_SDRAM
+obj-$(CONFIG_TARGET_SOCFPGA_GEN5) += sdram.o sequencer.o
+endif

include/configs/socfpga_common.h

@@ -72,11 +72,6 @@
 #define CONFIG_SYS_PL310_BASE		SOCFPGA_MPUL2_ADDRESS
 
 /*
- * SDRAM controller
- */
-#define CONFIG_ALTERA_SDRAM
-
-/*
  * EPCS/EPCQx1 Serial Flash Controller
  */
 #ifdef CONFIG_ALTERA_SPI