From: Marek Vasut <marek.vasut+renesas@gmail.com>
Date: Thu, 18 Oct 2018 16:38:05 +0000 (+0200)
Subject: ARM: renesas: Save boot parameters passed in by ATF
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=4fa8375ffec5bd1c7edabde42b8ee0339072df38;p=u-boot.git

ARM: renesas: Save boot parameters passed in by ATF

The ATF can pass additional information via the first four registers,
x0...x3. The R-Car Gen3 with mainline ATF, register x1 contains pointer
to a device tree with platform information. Save these registers for
future use.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
---

diff --git a/arch/arm/mach-rmobile/lowlevel_init_gen3.S b/arch/arm/mach-rmobile/lowlevel_init_gen3.S
index f42b53fd88..213ec143e2 100644
--- a/arch/arm/mach-rmobile/lowlevel_init_gen3.S
+++ b/arch/arm/mach-rmobile/lowlevel_init_gen3.S
@@ -16,6 +16,21 @@
 #include <linux/linkage.h>
 #include <asm/macro.h>
 
+.align 8
+.globl	rcar_atf_boot_args
+rcar_atf_boot_args:
+	.dword 0
+	.dword 0
+	.dword 0
+	.dword 0
+
+ENTRY(save_boot_params)
+	adr	x8, rcar_atf_boot_args
+	stp	x0, x1, [x8], #16
+	stp	x2, x3, [x8], #16
+	b	save_boot_params_ret
+ENDPROC(save_boot_params)
+
 ENTRY(lowlevel_init)
 	mov	x29, lr			/* Save LR */