linux-kernel - [DO NOT MERGE v6 06/37] sh: kernel/setup Update DT support.

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Date: Tue,  9 Jan 2024 17:23:03 +0900
From: Yoshinori Sato <ysato@...rs.sourceforge.jp>
To: linux-sh@...r.kernel.org
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Damien Le Moal <dlemoal@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
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Subject: [DO NOT MERGE v6 06/37] sh: kernel/setup Update DT support.

Fix extrnal fdt initialize and bootargs.

Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
---
 arch/sh/kernel/setup.c | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 3d80515298d2..e3f34027ac9e 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 +270,20 @@ 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();
+	}
+#endif
 	enable_mmu();
 
+#ifndef CONFIG_OF
 	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 
 	printk(KERN_NOTICE "Boot params:\n"
@@ -299,6 +312,8 @@ void __init setup_arch(char **cmdline_p)
 	bss_resource.start = virt_to_phys(__bss_start);
 	bss_resource.end = virt_to_phys(__bss_stop)-1;
 
+#endif
+
 #ifdef CONFIG_CMDLINE_OVERWRITE
 	strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 #else
@@ -310,9 +325,17 @@ void __init setup_arch(char **cmdline_p)
 #endif
 
 	/* Save unparsed command line copy for /proc/cmdline */
+#ifndef CONFIG_OF
 	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 	*cmdline_p = command_line;
-
+#else
+	if (!initial_boot_params) {
+		memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
+		*cmdline_p = command_line;
+	} else {
+		*cmdline_p = boot_command_line;
+	}
+#endif
 	parse_early_param();
 
 	plat_early_device_setup();
@@ -322,14 +345,6 @@ 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