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/*
* Copyright 2015 Freescale Semiconductor, Inc.
* Author: Wang Dongsheng <dongsheng.wang@freescale.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <linux/linkage.h>
#include <asm/armv7.h>
#include <asm/arch-armv7/generictimer.h>
#include <asm/psci.h>
#define SCFG_CORE0_SFT_RST 0x130
#define SCFG_CORESRENCR 0x204
#define DCFG_CCSR_BRR 0x0E4
#define DCFG_CCSR_SCRATCHRW1 0x200
.pushsection ._secure.text, "ax"
.arch_extension sec
#define ONE_MS (GENERIC_TIMER_CLK / 1000)
#define RESET_WAIT (30 * ONE_MS)
@ r0: return value ARM_PSCI_RET_SUCCESS or ARM_PSCI_RET_INVAL
@ r1: input target CPU ID in MPIDR format, original value in r1 may be dropped
@ r4: output validated CPU ID if ARM_PSCI_RET_SUCCESS returns, meaningless for
@ ARM_PSCI_RET_INVAL,suppose caller saves r4 before calling
LENTRY(psci_check_target_cpu_id)
@ Get the real CPU number
and r4, r1, #0xff
mov r0, #ARM_PSCI_RET_INVAL
@ Bit[31:24], bits must be zero.
tst r1, #0xff000000
bxne lr
@ Affinity level 2 - Cluster: only one cluster in LS1021xa.
tst r1, #0xff0000
bxne lr
@ Affinity level 1 - Processors: should be in 0xf00 format.
lsr r1, r1, #8
teq r1, #0xf
bxne lr
@ Affinity level 0 - CPU: only 0, 1 are valid in LS1021xa.
cmp r4, #2
bxge lr
mov r0, #ARM_PSCI_RET_SUCCESS
bx lr
ENDPROC(psci_check_target_cpu_id)
@ r1 = target CPU
@ r2 = target PC
.globl psci_cpu_on
psci_cpu_on:
push {r4, r5, r6, lr}
@ Clear and Get the correct CPU number
@ r1 = 0xf01
bl psci_check_target_cpu_id
cmp r0, #ARM_PSCI_RET_INVAL
beq out_psci_cpu_on
mov r0, r4
mov r1, r2
bl psci_save_target_pc
mov r1, r4
@ Get DCFG base address
movw r4, #(CONFIG_SYS_FSL_GUTS_ADDR & 0xffff)
movt r4, #(CONFIG_SYS_FSL_GUTS_ADDR >> 16)
@ Detect target CPU state
ldr r2, [r4, #DCFG_CCSR_BRR]
rev r2, r2
lsr r2, r2, r1
ands r2, r2, #1
beq holdoff_release
@ Reset target CPU
@ Get SCFG base address
movw r0, #(CONFIG_SYS_FSL_SCFG_ADDR & 0xffff)
movt r0, #(CONFIG_SYS_FSL_SCFG_ADDR >> 16)
@ Enable CORE Soft Reset
movw r5, #0
movt r5, #(1 << 15)
rev r5, r5
str r5, [r0, #SCFG_CORESRENCR]
@ Get CPUx offset register
mov r6, #0x4
mul r6, r6, r1
add r2, r0, r6
@ Do reset on target CPU
movw r5, #0
movt r5, #(1 << 15)
rev r5, r5
str r5, [r2, #SCFG_CORE0_SFT_RST]
@ Wait target CPU up
timer_wait r2, RESET_WAIT
@ Disable CORE soft reset
mov r5, #0
str r5, [r0, #SCFG_CORESRENCR]
holdoff_release:
@ Release on target CPU
ldr r2, [r4, #DCFG_CCSR_BRR]
mov r6, #1
lsl r6, r6, r1 @ 32 bytes per CPU
rev r6, r6
orr r2, r2, r6
str r2, [r4, #DCFG_CCSR_BRR]
@ Set secondary boot entry
ldr r6, =psci_cpu_entry
rev r6, r6
str r6, [r4, #DCFG_CCSR_SCRATCHRW1]
isb
dsb
@ Return
mov r0, #ARM_PSCI_RET_SUCCESS
out_psci_cpu_on:
pop {r4, r5, r6, lr}
bx lr
.globl psci_cpu_off
psci_cpu_off:
bl psci_cpu_off_common
1: wfi
b 1b
.popsection
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