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mt7629: use linux kernel compatible SMP initialization

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This patch changes mt7629 to use the compatible platform SMP initialization
method of linux kernel.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2018-12-20 16:12:50 +08:00 • committed by Tom Rini
parent 7d39b748ed
commit 1f5a3cd0aa
1 changed files with 44 additions and 8 deletions
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52
arch/arm/mach-mediatek/mt7629/lowlevel_init.S
View file

@ -5,6 +5,14 @@
#include <linux/linkage.h>
#define WAIT_CODE_SRAM_BASE 0x0010ff00
#define SLAVE_JUMP_REG 0x10202034
#define SLAVE1_MAGIC_REG 0x10202038
#define SLAVE1_MAGIC_NUM 0x534c4131
#define GIC_CPU_BASE 0x10320000
ENTRY(lowlevel_init)
#ifndef CONFIG_SPL_BUILD
@ -28,6 +36,7 @@ ENTRY(lowlevel_init)
mrc p15, 0, r0, c0, c0, 5
ands r1, r0, #0x40000000
bne go @ Go if UP
/* read slave CPU number */
ands r0, r0, #0x0f
beq go @ Go if core0 on primary core tile
b secondary
@ -37,14 +46,41 @@ go:
mov pc, lr
secondary:
/* read slave CPU number into r0 firstly */
mrc p15, 0, r0, c0, c0, 5
and r0, r0, #0x0f
/* enable GIC as cores will be waken up by IPI */
ldr r2, =GIC_CPU_BASE
mov r1, #0xf0
str r1, [r2, #4]
mov r1, #1
str r1, [r2, #0]
ldr r1, [r2]
orr r1, #1
str r1, [r2]
/* copy wait code into SRAM */
ldr r0, =slave_cpu_wait
ldm r0, {r1 - r8} @ slave_cpu_wait has eight insns
ldr r0, =WAIT_CODE_SRAM_BASE
stm r0, {r1 - r8}
/* pass args to slave_cpu_wait */
ldr r0, =SLAVE1_MAGIC_REG
ldr r1, =SLAVE1_MAGIC_NUM
/* jump to wait code in SRAM */
ldr pc, =WAIT_CODE_SRAM_BASE
loop:
dsb
isb
wfi @Zzz...
b loop
#endif
ENDPROC(lowlevel_init)
/* This function will be copied into SRAM */
ENTRY(slave_cpu_wait)
wfi
ldr r2, [r0]
cmp r2, r1
bne slave_cpu_wait
movw r0, #:lower16:SLAVE_JUMP_REG
movt r0, #:upper16:SLAVE_JUMP_REG
ldr r1, [r0]
mov pc, r1
ENDPROC(slave_cpu_wait)