From: johannes@sipsolutions.net (Johannes Berg)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/2] arm/mach-imx: enable big endian mode
Date: Wed, 27 Jan 2016 17:59:36 +0100 [thread overview]
Message-ID: <1453913976-30619-3-git-send-email-johannes@sipsolutions.net> (raw)
In-Reply-To: <1453913976-30619-1-git-send-email-johannes@sipsolutions.net>
Enable ARM big-endian mode on mach-imx. This requires adding some
byte swapping in the debug functions (which otherwise hang forever)
and of course the secondary core bringup.
Tested (on top of 4.4) on i.MX6 HummingBoard quad-core (IMX6Q).
The patch is pretty much as suggested by Arnd Bergmann, thanks!
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
arch/arm/include/debug/imx.S | 3 +++
arch/arm/mach-imx/Kconfig | 1 +
arch/arm/mach-imx/headsmp.S | 2 ++
3 files changed, 6 insertions(+)
diff --git a/arch/arm/include/debug/imx.S b/arch/arm/include/debug/imx.S
index 619d8cc1ac12..92c44760d656 100644
--- a/arch/arm/include/debug/imx.S
+++ b/arch/arm/include/debug/imx.S
@@ -11,6 +11,7 @@
*
*/
+#include <asm/assembler.h>
#include "imx-uart.h"
/*
@@ -34,6 +35,7 @@
.endm
.macro senduart,rd,rx
+ ARM_BE8(rev \rd, \rd)
str \rd, [\rx, #0x40] @ TXDATA
.endm
@@ -42,6 +44,7 @@
.macro busyuart,rd,rx
1002: ldr \rd, [\rx, #0x98] @ SR2
+ ARM_BE8(rev \rd, \rd)
tst \rd, #1 << 3 @ TXDC
beq 1002b @ wait until transmit done
.endm
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 15df34fbdf44..607e0fedbf1c 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -9,6 +9,7 @@ menuconfig ARCH_MXC
select PM_OPP if PM
select SOC_BUS
select SRAM
+ select ARCH_SUPPORTS_BIG_ENDIAN
help
Support for Freescale MXC/iMX-based family of processors
diff --git a/arch/arm/mach-imx/headsmp.S b/arch/arm/mach-imx/headsmp.S
index b5e976816b63..6c28d28b3c64 100644
--- a/arch/arm/mach-imx/headsmp.S
+++ b/arch/arm/mach-imx/headsmp.S
@@ -12,6 +12,7 @@
#include <linux/linkage.h>
#include <linux/init.h>
+#include <asm/assembler.h>
diag_reg_offset:
.word g_diag_reg - .
@@ -25,6 +26,7 @@ diag_reg_offset:
.endm
ENTRY(v7_secondary_startup)
+ARM_BE8(setend be) @ go BE8 if entered LE
set_diag_reg
b secondary_startup
ENDPROC(v7_secondary_startup)
--
2.6.2
next prev parent reply other threads:[~2016-01-27 16:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-27 16:59 [PATCH v2 0/2] arm/mach-imx: add big-endian support Johannes Berg
2016-01-27 16:59 ` [PATCH v2 1/2] arm/mach-imx: use endian-safe readl/readw/writel/writew Johannes Berg
2016-01-27 16:59 ` Johannes Berg [this message]
2016-02-02 5:33 ` [PATCH v2 2/2] arm/mach-imx: enable big endian mode Shawn Guo
2016-02-02 8:16 ` Johannes Berg
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