[PATCH v2] ARM: tegra: Maintain CPU endianness for asm code
From: Dmitry Osipenko
Date: Thu Mar 19 2015 - 08:17:44 EST
This patch adds support for big-endian CPU mode to assembler code, which is
required for booting secondary CPU's, cpuidle drivers and machine suspend/resume
functionality with big-endian kernel.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
Tested on Tegra 2 and 3.
Changelog:
V2: Cleanup a bit: reordered include header and replaced conditional branching with
conditional reg reverse in sleep-tegra20.S
arch/arm/mach-tegra/reset-handler.S | 13 +++++++++++++
arch/arm/mach-tegra/sleep-tegra20.S | 12 ++++++++++++
arch/arm/mach-tegra/sleep-tegra30.S | 9 +++++++++
arch/arm/mach-tegra/sleep.S | 1 +
arch/arm/mach-tegra/sleep.h | 3 +++
5 files changed, 38 insertions(+)
diff --git a/arch/arm/mach-tegra/reset-handler.S b/arch/arm/mach-tegra/reset-handler.S
index e3070fd..a200f4d 100644
--- a/arch/arm/mach-tegra/reset-handler.S
+++ b/arch/arm/mach-tegra/reset-handler.S
@@ -20,6 +20,7 @@
#include <soc/tegra/fuse.h>
#include <asm/asm-offsets.h>
+#include <asm/assembler.h>
#include <asm/cache.h>
#include "flowctrl.h"
@@ -43,6 +44,9 @@
* r8: CPU part number
*/
ENTRY(tegra_resume)
+
+ARM_BE8(setend be)
+
check_cpu_part_num 0xc09, r8, r9
bleq v7_invalidate_l1
@@ -59,12 +63,14 @@ ENTRY(tegra_resume)
cpu_to_csr_reg r1, r0
mov32 r2, TEGRA_FLOW_CTRL_BASE
ldr r1, [r2, r1]
+ARM_BE8(rev r1, r1)
/* Clear event & intr flag */
orr r1, r1, \
#FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps
@ & ext flags for CPU power mgnt
bic r1, r1, r0
+ARM_BE8(rev r1, r1)
str r1, [r2]
1:
@@ -75,7 +81,9 @@ ENTRY(tegra_resume)
/* enable SCU */
mov32 r0, TEGRA_ARM_PERIF_BASE
ldr r1, [r0]
+ARM_BE8(rev r1, r1)
orr r1, r1, #1
+ARM_BE8(rev r1, r1)
str r1, [r0]
#endif
@@ -118,6 +126,8 @@ ENTRY(__tegra_cpu_reset_handler_start)
.align L1_CACHE_SHIFT
ENTRY(__tegra_cpu_reset_handler)
+ARM_BE8(setend be)
+
cpsid aif, 0x13 @ SVC mode, interrupts disabled
tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
@@ -222,6 +232,9 @@ __no_cpu0_chk:
*/
__die:
+
+ARM_BE8(setend le)
+
sub lr, lr, #4
mov32 r7, TEGRA_PMC_BASE
str lr, [r7, #PMC_SCRATCH41]
diff --git a/arch/arm/mach-tegra/sleep-tegra20.S b/arch/arm/mach-tegra/sleep-tegra20.S
index e6b684e..991c549 100644
--- a/arch/arm/mach-tegra/sleep-tegra20.S
+++ b/arch/arm/mach-tegra/sleep-tegra20.S
@@ -105,12 +105,14 @@ ENTRY(tegra20_cpu_shutdown)
cpu_to_halt_reg r1, r0
ldr r3, =TEGRA_FLOW_CTRL_VIRT
mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
+ARM_BE8(rev r2, r2)
str r2, [r3, r1] @ put flow controller in wait event mode
ldr r2, [r3, r1]
isb
dsb
movw r1, 0x1011
mov r1, r1, lsl r0
+ARM_BE8(rev r1, r1)
ldr r3, =TEGRA_CLK_RESET_VIRT
str r1, [r3, #0x340] @ put slave CPU in reset
isb
@@ -155,13 +157,16 @@ ENTRY(tegra_pen_lock)
addne r3, r3, #PMC_SCRATCH38
mov r12, #1
+ARM_BE8(rev r12, r12)
str r12, [r2] @ flag[cpu] = 1
dsb
str r12, [r1] @ !turn = cpu
1: dsb
ldr r12, [r3]
+ARM_BE8(rev r12, r12)
cmp r12, #1 @ flag[!cpu] == 1?
ldreq r12, [r1]
+ARM_BE8(reveq r12, r12)
cmpeq r12, r0 @ !turn == cpu?
beq 1b @ while !turn == cpu && flag[!cpu] == 1
@@ -337,6 +342,9 @@ tegra20_iram_start:
* NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA.
*/
ENTRY(tegra20_lp1_reset)
+
+ARM_BE8(setend le)
+
/*
* The CPU and system bus are running at 32KHz and executing from
* IRAM when this code is executed; immediately switch to CLKM and
@@ -360,8 +368,10 @@ ENTRY(tegra20_lp1_reset)
mov r5, #0
ldr r6, tegra20_sdram_pad_size
+ARM_BE8(rev r6, r6)
padload:
ldr r7, [r2, r5] @ r7 is the addr in the pad_address
+ARM_BE8(rev r7, r7)
ldr r1, [r4, r5]
str r1, [r7] @ restore the value in pad_save
@@ -521,8 +531,10 @@ emcself:
mov r5, #0
ldr r6, tegra20_sdram_pad_size
+ARM_BE8(rev r6, r6)
padsave:
ldr r0, [r2, r5] @ r0 is the addr in the pad_address
+ARM_BE8(rev r0, r0)
ldr r1, [r0]
str r1, [r4, r5] @ save the content of the addr
diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S
index 5d8d13a..821c6df 100644
--- a/arch/arm/mach-tegra/sleep-tegra30.S
+++ b/arch/arm/mach-tegra/sleep-tegra30.S
@@ -184,6 +184,7 @@ _no_cpu0_chk:
ARM( orr r12, r12, r4, lsl r3 )
THUMB( lsl r4, r4, r3 )
THUMB( orr r12, r12, r4 )
+ARM_BE8(rev r12, r12)
str r12, [r1]
/* Halt this CPU. */
@@ -210,8 +211,10 @@ flow_ctrl_setting_for_lp2:
orrne r3, r3, #FLOW_CTRL_HALT_GIC_FIQ
flow_ctrl_done:
cmp r10, #TEGRA30
+ARM_BE8(rev r3, r3)
str r3, [r2]
ldr r0, [r2]
+ARM_BE8(rev r0, r0)
b wfe_war
__cpu_reset_again:
@@ -319,6 +322,9 @@ tegra30_iram_start:
* NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA.
*/
ENTRY(tegra30_lp1_reset)
+
+ARM_BE8(setend le)
+
/*
* The CPU and system bus are running at 32KHz and executing from
* IRAM when this code is executed; immediately switch to CLKM and
@@ -722,11 +728,13 @@ tegra30_sdram_self_refresh:
cmp r10, #TEGRA124
adreq r2, tegra124_sdram_pad_address
ldreq r3, tegra30_sdram_pad_size
+ARM_BE8(rev r3, r3)
mov r9, #0
padsave:
ldr r0, [r2, r9] @ r0 is the addr in the pad_address
+ARM_BE8(rev r0, r0)
ldr r1, [r0]
str r1, [r8, r9] @ save the content of the addr
@@ -744,6 +752,7 @@ padsave_done:
ldreq r0, =TEGRA_EMC0_BASE
cmp r10, #TEGRA124
ldreq r0, =TEGRA124_EMC_BASE
+ARM_BE8(rev r0, r0)
enter_self_refresh:
cmp r10, #TEGRA30
diff --git a/arch/arm/mach-tegra/sleep.S b/arch/arm/mach-tegra/sleep.S
index f024a51..1fd201f 100644
--- a/arch/arm/mach-tegra/sleep.S
+++ b/arch/arm/mach-tegra/sleep.S
@@ -139,6 +139,7 @@ ENTRY(tegra_shut_off_mmu)
moveq r3, #0
streq r3, [r2, #L2X0_CTRL]
#endif
+ARM_BE8(setend le)
ret r0
ENDPROC(tegra_shut_off_mmu)
.popsection
diff --git a/arch/arm/mach-tegra/sleep.h b/arch/arm/mach-tegra/sleep.h
index 0d59360..fa7aba4 100644
--- a/arch/arm/mach-tegra/sleep.h
+++ b/arch/arm/mach-tegra/sleep.h
@@ -118,8 +118,11 @@
/* Macro to check Tegra revision */
#define APB_MISC_GP_HIDREV 0x804
.macro tegra_get_soc_id base, tmp1
+ARM_BE8(mrc p15, 0, \tmp1, c1, c0)
+ARM_BE8(tst \tmp1, #(1 << 7)) @ check for little-endian bit
mov32 \tmp1, \base
ldr \tmp1, [\tmp1, #APB_MISC_GP_HIDREV]
+ARM_BE8(revne \tmp1, \tmp1)
and \tmp1, \tmp1, #0xff00
mov \tmp1, \tmp1, lsr #8
.endm
--
2.3.2
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