meta-nicole/recipes-bsp/u-boot/files/0001-Add-system-reset-status-support.patch

From cf39fde2c1cfb55aa756bfb551c4087ba2fd4b6c Mon Sep 17 00:00:00 2001
From: Alexander Filippov <a.filippov@yadro.com>
Date: Tue, 7 Apr 2020 16:45:41 +0300
Subject: [PATCH] Add system reset status support

This is backport of patch file from intel-bmc/openbmc repository.
  https://github.com/Intel-BMC/openbmc/blob/intel/meta-openbmc-mods/meta-common/recipes-bsp/u-boot/files/0020-Add-system-reset-status-support.patch

Will display the reset reasons in u-boot,
and save the reset reasons into kernel command line,
for applications to query.

Signed-off-by: Alexander Filippov <a.filippov@yadro.com>

---
 arch/arm/include/asm/arch-aspeed/ast_g5_platform.h |  1 +
 arch/arm/include/asm/arch-aspeed/ast_scu.h         |  2 +-
 arch/arm/mach-aspeed/ast-scu.c                     |  6 +-
 board/aspeed/ast-g5/ast-g5.c                       | 98 ++++++++++++++++++++++
 4 files changed, 105 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/arch-aspeed/ast_g5_platform.h b/arch/arm/include/asm/arch-aspeed/ast_g5_platform.h
index 4210873..d2a4268cd 100644
--- a/arch/arm/include/asm/arch-aspeed/ast_g5_platform.h
+++ b/arch/arm/include/asm/arch-aspeed/ast_g5_platform.h
@@ -188,5 +188,6 @@
 #define AST_FORMATTER_MEM_SIZE		0xC00000 /* 12MB */
 #define AST_FORMATTER_MEM_BASE 		(AST_H264_MEM_BASE + AST_H264_MEM_SIZE)
 
+#define CONFIG_BOARD_LATE_INIT 1 /* Call board_late_init */
 
 #endif
diff --git a/arch/arm/include/asm/arch-aspeed/ast_scu.h b/arch/arm/include/asm/arch-aspeed/ast_scu.h
index dcbc673..b428f38 100644
--- a/arch/arm/include/asm/arch-aspeed/ast_scu.h
+++ b/arch/arm/include/asm/arch-aspeed/ast_scu.h
@@ -29,7 +29,7 @@
 #define __AST_SCU_H
 
 extern void ast_scu_show_system_info (void);
-extern void ast_scu_sys_rest_info(void);
+extern u32 ast_scu_sys_rest_info(void);
 extern void ast_scu_security_info(void);
 extern u32 ast_scu_revision_id(void);
 extern u32 ast_scu_get_vga_memsize(void);
diff --git a/arch/arm/mach-aspeed/ast-scu.c b/arch/arm/mach-aspeed/ast-scu.c
index 12de9b8..5afd379 100644
--- a/arch/arm/mach-aspeed/ast-scu.c
+++ b/arch/arm/mach-aspeed/ast-scu.c
@@ -482,22 +482,26 @@ void ast_scu_security_info(void)
 	}
 }
 
-void ast_scu_sys_rest_info(void)
+u32 ast_scu_sys_rest_info(void)
 {
 	u32 rest = ast_scu_read(AST_SCU_SYS_CTRL);
 
 	if (rest & SCU_SYS_EXT_RESET_FLAG) {
 		printf("RST : External\n");
 		ast_scu_write(SCU_SYS_EXT_RESET_FLAG, AST_SCU_SYS_CTRL);
+		rest = SCU_SYS_EXT_RESET_FLAG;
 	} else if (rest & SCU_SYS_WDT_RESET_FLAG) {
 		printf("RST : Watchdog\n");
 		ast_scu_write(SCU_SYS_WDT_RESET_FLAG, AST_SCU_SYS_CTRL);
+		rest = SCU_SYS_WDT_RESET_FLAG;
 	} else if (rest & SCU_SYS_PWR_RESET_FLAG) {
 		printf("RST : Power On\n");
 		ast_scu_write(SCU_SYS_PWR_RESET_FLAG, AST_SCU_SYS_CTRL);
+		rest = SCU_SYS_PWR_RESET_FLAG;
 	} else {
 		printf("RST : CLK en\n");
 	}
+	return rest;
 }
 
 u32 ast_scu_get_vga_memsize(void)
diff --git a/board/aspeed/ast-g5/ast-g5.c b/board/aspeed/ast-g5/ast-g5.c
index 12496ce..42d7496 100644
--- a/board/aspeed/ast-g5/ast-g5.c
+++ b/board/aspeed/ast-g5/ast-g5.c
@@ -105,3 +105,104 @@ void hw_watchdog_reset(void)
 	writel(0x4755, AST_WDT2_BASE + 0x08);
 }
 #endif /* CONFIG_WATCHDOG */
+
+#ifdef CONFIG_BOARD_LATE_INIT
+static void update_bootargs_cmd(const char *key, const char *value)
+{
+    int buf_len;
+    char *buf;
+    char *cmdline;
+    char *end = NULL;
+
+    if (!key || (key[0] == '\0'))
+    {
+        printf("%s: Empty key not allowed\n", __func__);
+        return;
+    }
+
+    cmdline = getenv("bootargs");
+
+    /* Allocate space for maximum possible new command line */
+    buf_len = (cmdline ? strlen(cmdline) : 0)
+            + 1 /* spacebar as delimiter */
+            + strlen(key)
+            + (value ? 1 /* equal sign */ + strlen(value) : 0)
+            + 1 /* terminating null */;
+
+    buf = calloc(buf_len, sizeof(char));
+    if (!buf)
+    {
+        printf("%s: out of memory\n", __func__);
+        return;
+    }
+
+    if (cmdline)
+    {
+        char *start = strstr(cmdline, key);
+
+        /* Check for full word match. Match should be start of cmdline
+         * or there should be space before match */
+        if (start && ((start == cmdline) || (*(start - 1) == ' ')))
+        {
+            strncat(buf, cmdline, (start - cmdline));
+
+            /* Find the end of the keyword[=value] pair,
+             * including a single training space character, if any.
+             * Skip the found substring, mark the tail of cmdline.
+             */
+            end = strchr(start, ' ');
+            if (end)
+            {
+                end++;
+            }
+        }
+        else
+        {
+            strcat(buf, cmdline);
+            strcat(buf, " ");
+        }
+    }
+
+    strcat(buf, key);
+    if (value)
+    {
+        strcat(buf, "=");
+        strcat(buf, value);
+    }
+
+    if (end)
+    {
+        strcat(buf, " ");
+        strcat(buf, end);
+    }
+
+    setenv("bootargs", buf);
+    free(buf);
+}
+
+int board_late_init(void)
+{
+    u32 reset_reason = ast_scu_sys_rest_info();
+
+    if (reset_reason & SCU_SYS_EXT_RESET_FLAG)
+    {
+        update_bootargs_cmd("resetreason", "external");
+    }
+    else if (reset_reason & SCU_SYS_WDT_RESET_FLAG)
+    {
+        update_bootargs_cmd("resetreason", "watchdog");
+    }
+    else if (reset_reason & SCU_SYS_PWR_RESET_FLAG)
+    {
+        update_bootargs_cmd("resetreason", "power");
+    }
+    else
+    {
+        char value[32];
+        snprintf(value, sizeof(value) - 1, "0x%x", reset_reason);
+        update_bootargs_cmd("resetreason", value);
+    }
+
+    return 0;
+}
+#endif /* CONFIG_BOARD_LATE_INIT */