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, 59 insertions, 0 deletions

diff --git a/arch/arm/mach-uniphier/memconf/memconf-ph1-sld3.c b/arch/arm/mach-uniphier/memconf/memconf-ph1-sld3.c
new file mode 100644
index 0000000000..e13f56d1dc
--- /dev/null
+++ b/arch/arm/mach-uniphier/memconf/memconf-ph1-sld3.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+#include <mach/init.h>
+#include <mach/sg-regs.h>
+
+int ph1_sld3_memconf_init(const struct uniphier_board_data *bd)
+{
+	u32 tmp;
+	unsigned long size_per_word;
+
+	tmp = readl(SG_MEMCONF);
+
+	tmp &= ~(SG_MEMCONF_CH2_SZ_MASK | SG_MEMCONF_CH2_NUM_MASK);
+
+	switch (bd->dram_ch2_width) {
+	case 16:
+		tmp |= SG_MEMCONF_CH2_NUM_1;
+		size_per_word = bd->dram_ch2_size;
+		break;
+	case 32:
+		tmp |= SG_MEMCONF_CH2_NUM_2;
+		size_per_word = bd->dram_ch2_size >> 1;
+		break;
+	default:
+		pr_err("error: unsupported DRAM Ch2 width\n");
+		return -EINVAL;
+	}
+
+	/* Set DDR size */
+	switch (size_per_word) {
+	case SZ_64M:
+		tmp |= SG_MEMCONF_CH2_SZ_64M;
+		break;
+	case SZ_128M:
+		tmp |= SG_MEMCONF_CH2_SZ_128M;
+		break;
+	case SZ_256M:
+		tmp |= SG_MEMCONF_CH2_SZ_256M;
+		break;
+	case SZ_512M:
+		tmp |= SG_MEMCONF_CH2_SZ_512M;
+		break;
+	default:
+		pr_err("error: unsupported DRAM Ch2 size\n");
+		return -EINVAL;
+	}
+
+	writel(tmp, SG_MEMCONF);
+
+	return 0;
+}