From: Frank Wunderlich <linux@fw-web.de>
To: u-boot@lists.denx.de
Subject: [RFC PATCH 2/4] mt7622: add lowlevel_init from 2014-04
Date: Mon, 10 Aug 2020 16:26:50 +0200 [thread overview]
Message-ID: <20200810142652.40669-3-linux@fw-web.de> (raw)
In-Reply-To: <20200810142652.40669-1-linux@fw-web.de>
From: Frank Wunderlich <frank-w@public-files.de>
add low level initialisation to gain access to jumparch64 target in
mt7622 ATF from 32bit uboot.
jumparch64 allows switching from 32bit to 64bit to
load 64bit kernel from 32bit uboot
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
arch/arm/mach-mediatek/mt7622/Makefile | 4 +++
arch/arm/mach-mediatek/mt7622/lowlevel_init.S | 33 +++++++++++++++++++
2 files changed, 37 insertions(+)
create mode 100755 arch/arm/mach-mediatek/mt7622/lowlevel_init.S
diff --git a/arch/arm/mach-mediatek/mt7622/Makefile b/arch/arm/mach-mediatek/mt7622/Makefile
index 886ab7e4eb..5fe4505ddf 100644
--- a/arch/arm/mach-mediatek/mt7622/Makefile
+++ b/arch/arm/mach-mediatek/mt7622/Makefile
@@ -1,3 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += init.o
+
+ifeq ($(CONFIG_ARCH_MEDIATEK_32),y)
+ obj-y += lowlevel_init.o
+endif
diff --git a/arch/arm/mach-mediatek/mt7622/lowlevel_init.S b/arch/arm/mach-mediatek/mt7622/lowlevel_init.S
new file mode 100755
index 0000000000..bf20cbd1e7
--- /dev/null
+++ b/arch/arm/mach-mediatek/mt7622/lowlevel_init.S
@@ -0,0 +1,33 @@
+/*
+ * (C) Copyright 2012 Stephen Warren
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+.globl lowlevel_init
+lowlevel_init:
+ /*Enable SMP bit*/
+ mrc p15, 0, r0, c1, c0, 1
+ orr r0, r0, #0x40
+ mcr p15, 0, r0, c1, c0, 1
+ mov pc, lr
+
+.global jumparch64_smc
+jumparch64_smc:
+ mov r3, r2
+ mov r2, r1
+ mov r1, r0
+ ldr r0, =0x82000200 /*please check MTK_SIP_KERNEL_TMP_AARCH32 in vendor/arm/atf/include/bl31/services/sip_svc.h*/
+# smc #0
+ .word 0xe1600070 @ SMC #0 to enter monitor - hand assembled
+ b .
--
2.25.1
next prev parent reply other threads:[~2020-08-10 14:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 14:26 [RFC PATCH 0/4] Add 32bit-mode for mt7622 Frank Wunderlich
2020-08-10 14:26 ` [RFC PATCH 1/4] mt7622: Support to build 32 bits version Frank Wunderlich
2020-08-11 2:11 ` Sam Shih
2020-08-11 10:01 ` Frank Wunderlich
2020-08-10 14:26 ` Frank Wunderlich [this message]
2020-08-10 14:26 ` [RFC PATCH 3/4] jumparch64: insert into bootm Frank Wunderlich
2020-08-10 14:26 ` [RFC PATCH 4/4] jumparch64: add go64 Frank Wunderlich
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