aspeed: Board init functions and common configs for ast2500 based boards

Add configuration file with parameters that are very likely to be shared by
all ast2500-based boards.
Add ast2500-board.c file with the init code that is very likely to be
shared by all ast2500-based boards.
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/mach-aspeed/Makefile

@@ -5,4 +5,4 @@
 #
 
 obj-$(CONFIG_ARCH_ASPEED) += ast_wdt.o
-obj-$(CONFIG_ASPEED_AST2500) += ast2500/
+obj-$(CONFIG_ASPEED_AST2500) += ast2500/ ast2500-board.o

arch/arm/mach-aspeed/ast2500-board.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+#include <timer.h>
+#include <asm/io.h>
+#include <asm/arch/timer.h>
+#include <asm/arch/wdt.h>
+#include <linux/err.h>
+#include <dm/uclass.h>
+
+/*
+ * Second Watchdog Timer by default is configured
+ * to trigger secondary boot source.
+ */
+#define AST_2ND_BOOT_WDT		1
+
+/*
+ * Third Watchdog Timer by default is configured
+ * to toggle Flash address mode switch before reset.
+ */
+#define AST_FLASH_ADDR_DETECT_WDT	2
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void lowlevel_init(void)
+{
+	/*
+	 * These two watchdogs need to be stopped as soon as possible,
+	 * otherwise the board might hang. By default they are set to
+	 * a very short timeout and even simple debug write to serial
+	 * console early in the init process might cause them to fire.
+	 */
+	struct ast_wdt *flash_addr_wdt =
+	    (struct ast_wdt *)(WDT_BASE +
+			       sizeof(struct ast_wdt) *
+			       AST_FLASH_ADDR_DETECT_WDT);
+
+	clrbits_le32(&flash_addr_wdt->ctrl, WDT_CTRL_EN);
+
+#ifndef CONFIG_FIRMWARE_2ND_BOOT
+	struct ast_wdt *sec_boot_wdt =
+	    (struct ast_wdt *)(WDT_BASE +
+			       sizeof(struct ast_wdt) *
+			       AST_2ND_BOOT_WDT);
+
+	clrbits_le32(&sec_boot_wdt->ctrl, WDT_CTRL_EN);
+#endif
+}
+
+int board_init(void)
+{
+	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
+
+	return 0;
+}
+
+int dram_init(void)
+{
+	struct udevice *dev;
+	struct ram_info ram;
+	int ret;
+
+	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
+	if (ret) {
+		debug("DRAM FAIL1\r\n");
+		return ret;
+	}
+
+	ret = ram_get_info(dev, &ram);
+	if (ret) {
+		debug("DRAM FAIL2\r\n");
+		return ret;
+	}
+
+	gd->ram_size = ram.size;
+
+	return 0;
+}

include/configs/aspeed-common.h

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2012-2020  ASPEED Technology Inc.
+ * Ryan Chen <ryan_chen@aspeedtech.com>
+ *
+ * Copyright 2016 IBM Corporation
+ * (C) Copyright 2016 Google, Inc
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __AST_COMMON_CONFIG_H
+#define __AST_COMMON_CONFIG_H
+
+/* Misc CPU related */
+#define CONFIG_CMDLINE_TAG
+#define CONFIG_SETUP_MEMORY_TAGS
+#define CONFIG_INITRD_TAG
+
+#define CONFIG_CMDLINE_EDITING
+
+/* Enable cache controller */
+#define CONFIG_SYS_DCACHE_OFF
+
+#define CONFIG_SYS_SDRAM_BASE		0x80000000
+
+#ifdef CONFIG_PRE_CON_BUF_SZ
+#define CONFIG_SYS_INIT_RAM_ADDR	(0x1e720000 + CONFIG_PRE_CON_BUF_SZ)
+#define CONFIG_SYS_INIT_RAM_SIZE	(36*1024 - CONFIG_PRE_CON_BUF_SZ)
+#else
+#define CONFIG_SYS_INIT_RAM_ADDR	(0x1e720000)
+#define CONFIG_SYS_INIT_RAM_SIZE	(36*1024)
+#endif
+
+#define SYS_INIT_RAM_END		(CONFIG_SYS_INIT_RAM_ADDR \
+					 + CONFIG_SYS_INIT_RAM_SIZE)
+#define CONFIG_SYS_INIT_SP_ADDR		(SYS_INIT_RAM_END \
+					 - GENERATED_GBL_DATA_SIZE)
+
+#define CONFIG_NR_DRAM_BANKS		1
+
+#define CONFIG_SYS_MALLOC_LEN		(32 << 20)
+
+/*
+ * NS16550 Configuration
+ */
+#define CONFIG_BAUDRATE			115200
+
+/*
+ * BOOTP options
+ */
+#define CONFIG_BOOTP_BOOTFILESIZE
+#define CONFIG_BOOTP_BOOTPATH
+#define CONFIG_BOOTP_GATEWAY
+#define CONFIG_BOOTP_HOSTNAME
+#define CONFIG_BOOTP_SUBNETMASK
+
+/*
+ * Miscellaneous configurable options
+ */
+#define CONFIG_SYS_LONGHELP
+#define CONFIG_SYS_CBSIZE		256
+
+/* Print Buffer Size */
+#define CONFIG_SYS_PBSIZE		(CONFIG_SYS_CBSIZE \
+					 + sizeof(CONFIG_SYS_PROMPT) + 16)
+#define CONFIG_SYS_MAXARGS		16
+#define CONFIG_SYS_BARGSIZE		CONFIG_SYS_CBSIZE
+
+#define CONFIG_BOOTARGS \
+		"console=ttyS4,115200n8" \
+		" root=/dev/ram rw"
+
+#define CONFIG_BOOTCOMMAND		"bootm 20080000 20300000"
+#define CONFIG_ENV_OVERWRITE
+
+#define CONFIG_EXTRA_ENV_SETTINGS \
+	"verify=yes\0"	\
+	"spi_dma=yes\0" \
+	""
+
+#endif	/* __AST_COMMON_CONFIG_H */