ARM: uniphier: allow to use System Bus for ROM boot mode of PH1-LD20

The System Bus is not available by default on the ROM boot mode of
PH1-LD20.  To use devices connected to the System Bus, such as the
Micro Support Card, it is necessary to set up pin-muxing and some
System Bus Controller register.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/early-pinctrl/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_ARCH_UNIPHIER_SLD3)	+= early-pinctrl-sld3.o
+obj-$(CONFIG_ARCH_UNIPHIER_LD20)	+= early-pinctrl-ld20.o

arch/arm/mach-uniphier/early-pinctrl/early-pinctrl-ld20.c

+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include "../init.h"
+#include "../sg-regs.h"
+
+int uniphier_ld20_early_pin_init(const struct uniphier_board_data *bd)
+{
+	/* Comment format:    PAD Name -> Function Name */
+	sg_set_pinsel(0, 0, 8, 4);	/* XECS1  -> XECS1 */
+	sg_set_pinsel(1, 0, 8, 4);	/* ERXW   -> ERXW  */
+	sg_set_pinsel(2, 0, 8, 4);	/* XERWE1 -> XERWE1 */
+	sg_set_pinsel(6, 2, 8, 4);	/* XNFRE  -> XERWE0 */
+	sg_set_pinsel(7, 2, 8, 4);	/* XNFWE  -> ES0 */
+	sg_set_pinsel(8, 2, 8, 4);	/* NFALE  -> ES1 */
+	sg_set_pinsel(9, 2, 8, 4);	/* NFCLE  -> ES2 */
+	sg_set_pinsel(10, 2, 8, 4);	/* NFD0   -> ED0 */
+	sg_set_pinsel(11, 2, 8, 4);	/* NFD1   -> ED1 */
+	sg_set_pinsel(12, 2, 8, 4);	/* NFD2   -> ED2 */
+	sg_set_pinsel(13, 2, 8, 4);	/* NFD3   -> ED3 */
+	sg_set_pinsel(14, 2, 8, 4);	/* NFD4   -> ED4 */
+	sg_set_pinsel(15, 2, 8, 4);	/* NFD5   -> ED5 */
+	sg_set_pinsel(16, 2, 8, 4);	/* NFD6   -> ED6 */
+	sg_set_pinsel(17, 2, 8, 4);	/* NFD7   -> ED7 */
+	sg_set_iectrl_range(0, 2);
+	sg_set_iectrl_range(6, 17);
+
+	return 0;
+}

arch/arm/mach-uniphier/init.h

@@ -90,6 +90,7 @@ int uniphier_pxs2_early_clk_init(const struct uniphier_board_data *bd);
 int uniphier_ld20_early_clk_init(const struct uniphier_board_data *bd);
 
 int uniphier_sld3_early_pin_init(const struct uniphier_board_data *bd);
+int uniphier_ld20_early_pin_init(const struct uniphier_board_data *bd);
 
 int uniphier_ld4_umc_init(const struct uniphier_board_data *bd);
 int uniphier_pro4_umc_init(const struct uniphier_board_data *bd);

arch/arm/mach-uniphier/init/init-ld20.c

@@ -13,6 +13,8 @@
 int uniphier_ld20_init(const struct uniphier_board_data *bd)
 {
 	uniphier_sbc_init_savepin(bd);
+	uniphier_pxs2_sbc_init(bd);
+	uniphier_ld20_early_pin_init(bd);
 
 	support_card_reset();
 

arch/arm/mach-uniphier/sbc/Makefile

@@ -9,4 +9,4 @@ obj-$(CONFIG_ARCH_UNIPHIER_SLD8)	+= sbc-savepin.o sbc-ld4.o
 obj-$(CONFIG_ARCH_UNIPHIER_PRO5)	+= sbc-savepin.o
 obj-$(CONFIG_ARCH_UNIPHIER_PXS2)	+= sbc-savepin.o sbc-pxs2.o
 obj-$(CONFIG_ARCH_UNIPHIER_LD6B)	+= sbc-savepin.o sbc-pxs2.o
-obj-$(CONFIG_ARCH_UNIPHIER_LD20)	+= sbc-savepin.o
+obj-$(CONFIG_ARCH_UNIPHIER_LD20)	+= sbc-savepin.o sbc-pxs2.o