ARM: uniphier: allow to enable multiple SoCs

Before this commit, the Kconfig menu in mach-uniphier only allowed us
to choose one SoC to be compiled.  Each SoC has its own defconfig file
for the build-test coverage.  Consequently, some defconfig files are
duplicated with only the difference in CONFIG_DEFAULT_DEVICE_TREE and
CONFIG_{SOC_NAME}=y.

Now, most of board-specific parameters have been moved to device trees,
so it makes sense to include init code of multiple SoCs into a single
image as long as the SoCs have similar architecture.  In fact, some
SoCs of UniPhier family are very similar:
 - PH1-LD4 and PH1-sLD8
 - PH1-LD6b and ProXstream2 (will be added in the upcoming commit)

This commit will be helpful to merge some defconfig files for better
maintainability.

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

1 files changed, 61 insertions, 0 deletions

diff --git a/arch/arm/mach-uniphier/soc_info.c b/arch/arm/mach-uniphier/soc_info.c
new file mode 100644
index 0000000000..3e8e7f4ef3
--- /dev/null
+++ b/arch/arm/mach-uniphier/soc_info.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <linux/io.h>
+#include <linux/types.h>
+#include <mach/sg-regs.h>
+#include <mach/soc_info.h>
+
+#if UNIPHIER_MULTI_SOC
+enum uniphier_soc_id uniphier_get_soc_type(void)
+{
+	u32 revision = readl(SG_REVISION);
+	enum uniphier_soc_id ret;
+
+	switch ((revision & SG_REVISION_TYPE_MASK) >> SG_REVISION_TYPE_SHIFT) {
+#ifdef CONFIG_ARCH_UNIPHIER_PH1_SLD3
+	case 0x25:
+		ret = SOC_UNIPHIER_PH1_SLD3;
+		break;
+#endif
+#ifdef CONFIG_ARCH_UNIPHIER_PH1_LD4
+	case 0x26:
+		ret = SOC_UNIPHIER_PH1_LD4;
+		break;
+#endif
+#ifdef CONFIG_ARCH_UNIPHIER_PH1_PRO4
+	case 0x28:
+		ret = SOC_UNIPHIER_PH1_PRO4;
+		break;
+#endif
+#ifdef CONFIG_ARCH_UNIPHIER_PH1_SLD8
+	case 0x29:
+		ret = SOC_UNIPHIER_PH1_SLD8;
+		break;
+#endif
+#ifdef CONFIG_ARCH_UNIPHIER_PH1_PRO5
+	case 0x2A:
+		ret = SOC_UNIPHIER_PH1_PRO5;
+		break;
+#endif
+#ifdef CONFIG_ARCH_UNIPHIER_PROXSTREAM2
+	case 0x2E:
+		ret = SOC_UNIPHIER_PROXSTREAM2;
+		break;
+#endif
+#ifdef CONFIG_ARCH_UNIPHIER_PH1_LD6B
+	case 0x2F:
+		ret = SOC_UNIPHIER_PH1_LD6B;
+		break;
+#endif
+	default:
+		ret = SOC_UNIPHIER_UNKNOWN;
+		break;
+	}
+
+	return ret;
+}
+#endif