linux-kernel - [PATCH 3/3] ARM: zynq: Enable big-endian

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Date:	Thu,  8 May 2014 17:13:39 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	git@...inx.com, monstr@...str.eu,
	Josh Cartwright <josh.cartwright@...com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] ARM: zynq: Enable big-endian

Enable ARCH_SUPPORTS_BIG_ENDIAN in Kconfig.

zynq_secondary_trampoline is the first function
that is called on secondary CPU.
Reference:
"ARM: mcpm: fix big endian issue in mcpm startup code"
(sha1: 519ceb9fd10cd7e836d0aa97b2068cc9e97f463b)

Fix early printk support. Based on:
"ARM: pl01x debug code endian fix"
(sha1: 76e3faf156fa95b6465e747d702b94faf67117fc)

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---

 arch/arm/include/debug/zynq.S | 2 ++
 arch/arm/mach-zynq/Kconfig    | 1 +
 arch/arm/mach-zynq/headsmp.S  | 5 ++++-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/debug/zynq.S b/arch/arm/include/debug/zynq.S
index 0b762fafa758..3895146341f3 100644
--- a/arch/arm/include/debug/zynq.S
+++ b/arch/arm/include/debug/zynq.S
@@ -43,12 +43,14 @@

 		.macro	waituart,rd,rx
 1001:		ldr	\rd, [\rx, #UART_SR_OFFSET]
+ARM_BE8(	rev	\rd, \rd )
 		tst	\rd, #UART_SR_TXEMPTY
 		beq	1001b
 		.endm

 		.macro	busyuart,rd,rx
 1002:		ldr	\rd, [\rx, #UART_SR_OFFSET]	@ get status register
+ARM_BE8(	rev	\rd, \rd )
 		tst	\rd, #UART_SR_TXFULL		@
 		bne	1002b			@ wait if FIFO is full
 		.endm
diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 1daa5c220d1d..ff03a71bb9a3 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -2,6 +2,7 @@ config ARCH_ZYNQ
 	bool "Xilinx Zynq ARM Cortex A9 Platform" if ARCH_MULTI_V7
 	select ARCH_HAS_CPUFREQ
 	select ARCH_HAS_OPP
+	select ARCH_SUPPORTS_BIG_ENDIAN
 	select ARM_AMBA
 	select ARM_GIC
 	select ARM_GLOBAL_TIMER if !CPU_FREQ
diff --git a/arch/arm/mach-zynq/headsmp.S b/arch/arm/mach-zynq/headsmp.S
index 57a32869f0aa..dd8c071941e7 100644
--- a/arch/arm/mach-zynq/headsmp.S
+++ b/arch/arm/mach-zynq/headsmp.S
@@ -8,9 +8,12 @@
  */
 #include <linux/linkage.h>
 #include <linux/init.h>
+#include <asm/assembler.h>

 ENTRY(zynq_secondary_trampoline)
-	ldr	r0, [pc]
+ARM_BE8(setend	be)				@ ensure we are in BE8 mode
+	ldr	r0, zynq_secondary_trampoline_jump
+ARM_BE8(rev	r0, r0)
 	bx	r0
 .globl zynq_secondary_trampoline_jump
 zynq_secondary_trampoline_jump:
--
1.8.2.3


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