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From: Yoshinori Sato <ysato@users.sourceforge.jp>
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Subject: [PATCH v7 06/37] sh: kernel/setup Update DT support.
Date: Thu,  4 Apr 2024 13:59:31 +0900
Message-Id: <a4ce7771faec761b9bbb91ff6694a99e5bc293b6.1712205900.git.ysato@users.sourceforge.jp>
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Fix extrnal fdt initialize and bootargs.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 arch/sh/Kconfig             | 23 +++++++++++------------
 arch/sh/include/asm/setup.h |  1 +
 arch/sh/kernel/setup.c      | 36 +++++++++++++++++++++++-------------
 3 files changed, 35 insertions(+), 25 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 6711cde0d973..242cf30e704d 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -708,17 +708,22 @@ config ROMIMAGE_MMCIF
 	  first part of the romImage which in turn loads the rest the kernel
 	  image to RAM using the MMCIF hardware block.
 
+config CMDLINE
+	string "Kernel command line arguments string"
+	default "console=ttySC1,115200"
+
 choice
 	prompt "Kernel command line"
-	optional
-	default CMDLINE_OVERWRITE
-	depends on !OF || USE_BUILTIN_DTB
+	default CMDLINE_BOOTLOADER
+
+config CMDLINE_BOOTLOADER
+	bool "Use bootloader kernel arguments"
 	help
-	  Setting this option allows the kernel command line arguments
-	  to be set.
+	  Uses the command-line options passed by the boot loader.
+	  If boot loader dosen't provide kernel argments, Use built-in argments.
 
 config CMDLINE_OVERWRITE
-	bool "Overwrite bootloader kernel arguments"
+	bool "Overwrite built-in kernel arguments"
 	help
 	  Given string will overwrite any arguments passed in by
 	  a bootloader.
@@ -730,12 +735,6 @@ config CMDLINE_EXTEND
 	  by a bootloader.
 
 endchoice
-
-config CMDLINE
-	string "Kernel command line arguments string"
-	depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND
-	default "console=ttySC1,115200"
-
 endmenu
 
 menu "Bus options"
diff --git a/arch/sh/include/asm/setup.h b/arch/sh/include/asm/setup.h
index fc807011187f..84bb23a771f3 100644
--- a/arch/sh/include/asm/setup.h
+++ b/arch/sh/include/asm/setup.h
@@ -21,5 +21,6 @@
 void sh_mv_setup(void);
 void check_for_initrd(void);
 void per_cpu_trap_init(void);
+void sh_fdt_init(phys_addr_t dt_phys);
 
 #endif /* _SH_SETUP_H */
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 620e5cf8ae1e..42e6292a40cf 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -30,6 +30,7 @@
 #include <linux/memblock.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
+#include <linux/libfdt.h>
 #include <linux/uaccess.h>
 #include <uapi/linux/mount.h>
 #include <asm/io.h>
@@ -269,8 +270,22 @@ void __ref sh_fdt_init(phys_addr_t dt_phys)
 
 void __init setup_arch(char **cmdline_p)
 {
+#if defined(CONFIG_OF) && defined(CONFIG_OF_EARLY_FLATTREE)
+	if (IS_ENABLED(CONFIG_USE_BUILTIN_DTB)) {
+		/* Relocate Embedded DTB */
+		unflatten_and_copy_device_tree();
+	} else if (initial_boot_params) {
+		/* Reserve external DTB area */
+		memblock_reserve(__pa(initial_boot_params),
+				 fdt_totalsize(initial_boot_params));
+		unflatten_device_tree();
+	}
+	/* copy from /chosen/bootargs */
+	strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+#endif
 	enable_mmu();
 
+#ifndef CONFIG_OF
 	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 
 	printk(KERN_NOTICE "Boot params:\n"
@@ -299,14 +314,17 @@ void __init setup_arch(char **cmdline_p)
 	bss_resource.start = virt_to_phys(__bss_start);
 	bss_resource.end = virt_to_phys(__bss_stop)-1;
 
-#ifdef CONFIG_CMDLINE_OVERWRITE
-	strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
-#else
-	strscpy(command_line, COMMAND_LINE, sizeof(command_line));
+#endif
+#if !defined(CONFIG_OF) || defined(CONFIG_USE_BUILTIN_DTB)
+	if (*COMMAND_LINE)
+		strscpy(command_line, COMMAND_LINE, sizeof(command_line));
+#endif
+	if (*command_line == '\0' || IS_ENABLED(CONFIG_CMDLINE_OVERWRITE))
+		/* Use built-in parameter */
+		strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 #ifdef CONFIG_CMDLINE_EXTEND
 	strlcat(command_line, " ", sizeof(command_line));
 	strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
-#endif
 #endif
 
 	/* Save unparsed command line copy for /proc/cmdline */
@@ -322,14 +340,6 @@ void __init setup_arch(char **cmdline_p)
 	/* Let earlyprintk output early console messages */
 	sh_early_platform_driver_probe("earlyprintk", 1, 1);
 
-#ifdef CONFIG_OF_EARLY_FLATTREE
-#ifdef CONFIG_USE_BUILTIN_DTB
-	unflatten_and_copy_device_tree();
-#else
-	unflatten_device_tree();
-#endif
-#endif
-
 	paging_init();
 
 	/* Perform the machine specific initialisation */
-- 
2.39.2