111 lines
2.0 KiB
ArmAsm
111 lines
2.0 KiB
ArmAsm
/*
|
|
* Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/smp_scu.h>
|
|
#include "hardware.h"
|
|
|
|
.macro disable_l1_dcache
|
|
|
|
/*
|
|
* Flush all data from the L1 data cache before disabling
|
|
* SCTLR.C bit.
|
|
*/
|
|
push {r0 - r10, lr}
|
|
ldr r7, =v7_flush_dcache_all
|
|
mov lr, pc
|
|
mov pc, r7
|
|
pop {r0 - r10, lr}
|
|
|
|
/* disable d-cache */
|
|
mrc p15, 0, r7, c1, c0, 0
|
|
bic r7, r7, #(1 << 2)
|
|
mcr p15, 0, r7, c1, c0, 0
|
|
dsb
|
|
isb
|
|
|
|
push {r0 - r10, lr}
|
|
ldr r7, =v7_flush_dcache_all
|
|
mov lr, pc
|
|
mov pc, r7
|
|
pop {r0 - r10, lr}
|
|
|
|
.endm
|
|
|
|
#ifdef CONFIG_SMP
|
|
.align 3
|
|
|
|
ENTRY(imx7_smp_wfe)
|
|
push {r4 - r11, lr}
|
|
|
|
dsb
|
|
isb
|
|
|
|
disable_l1_dcache
|
|
|
|
isb
|
|
|
|
/* Turn off SMP bit. */
|
|
mrc p15, 0, r8, c1, c0, 1
|
|
bic r8, r8, #0x40
|
|
mcr p15, 0, r8, c1, c0, 1
|
|
|
|
isb
|
|
/* Set flag of entering WFE. */
|
|
mov r7, #0xff
|
|
lsl r7, r7, r0
|
|
mov r6, #SCU_PM_DORMANT
|
|
lsl r6, r6, r0
|
|
ldr r8, [r1, #0x4]
|
|
bic r8, r8, r7
|
|
orr r6, r6, r8
|
|
str r6, [r1, #0x4]
|
|
|
|
go_back_wfe:
|
|
wfe
|
|
|
|
/* Offset 0x0 stores busfeq done flag */
|
|
ldr r6, [r1]
|
|
cmp r6, #1
|
|
beq go_back_wfe
|
|
|
|
/* Turn ON SMP bit. */
|
|
mrc p15, 0, r8, c1, c0, 1
|
|
orr r8, r8, #0x40
|
|
mcr p15, 0, r8, c1, c0, 1
|
|
|
|
isb
|
|
/* Enable L1 data cache. */
|
|
mrc p15, 0, r8, c1, c0, 0
|
|
orr r8, r8, #0x4
|
|
mcr p15, 0, r8, c1, c0, 0
|
|
isb
|
|
|
|
/* Set flag of exiting WFE. */
|
|
mov r7, #0xff
|
|
lsl r7, r7, r0
|
|
mov r6, #SCU_PM_NORMAL
|
|
lsl r6, r6, r0
|
|
ldr r8, [r1, #0x4]
|
|
bic r8, r8, r7
|
|
orr r6, r6, r8
|
|
str r6, [r1, #0x4]
|
|
|
|
/* Pop all saved registers. */
|
|
pop {r4 - r11, lr}
|
|
mov pc, lr
|
|
.ltorg
|
|
ENDPROC(imx7_smp_wfe)
|
|
#endif
|