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/* SPDX-License-Identifier: GPL-2.0
*
* SMP support for R-Mobile / SH-Mobile
*
* Copyright (C) 2010 Magnus Damm
* Copyright (C) 2010 Takashi Yoshii
*
* Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved
*/
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/threads.h>
#include <asm/assembler.h>
#include <asm/memory.h>
#define SCTLR_MMU 0x01
#define BOOTROM_ADDRESS 0xE6340000
#define RWTCSRA_ADDRESS 0xE6020004
#define RWTCSRA_WOVF 0x10
/*
* Reset vector for secondary CPUs.
* This will be mapped at address 0 by SBAR register.
* We need _long_ jump to the physical address.
*/
.arm
.align 12
ENTRY(shmobile_boot_vector)
ldr r1, 1f
bx r1
ENDPROC(shmobile_boot_vector)
.align 2
.globl shmobile_boot_fn
shmobile_boot_fn:
1: .space 4
.globl shmobile_boot_size
shmobile_boot_size:
.long . - shmobile_boot_vector
#ifdef CONFIG_ARCH_RCAR_GEN2
/*
* Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs.
* This will be mapped at address 0 by SBAR register.
*/
ENTRY(shmobile_boot_vector_gen2)
mrc p15, 0, r0, c0, c0, 5 @ r0 = MPIDR
ldr r1, shmobile_boot_cpu_gen2
cmp r0, r1
bne shmobile_smp_continue_gen2
mrc p15, 0, r1, c1, c0, 0 @ r1 = SCTLR
and r0, r1, #SCTLR_MMU
cmp r0, #SCTLR_MMU
beq shmobile_smp_continue_gen2
ldr r0, rwtcsra
mov r1, #0
ldrb r1, [r0]
and r0, r1, #RWTCSRA_WOVF
cmp r0, #RWTCSRA_WOVF
bne shmobile_smp_continue_gen2
ldr r0, bootrom
bx r0
shmobile_smp_continue_gen2:
ldr r1, shmobile_boot_fn_gen2
bx r1
ENDPROC(shmobile_boot_vector_gen2)
.align 4
rwtcsra:
.word RWTCSRA_ADDRESS
bootrom:
.word BOOTROM_ADDRESS
.globl shmobile_boot_cpu_gen2
shmobile_boot_cpu_gen2:
.word 0x00000000
.align 2
.globl shmobile_boot_fn_gen2
shmobile_boot_fn_gen2:
.space 4
.globl shmobile_boot_size_gen2
shmobile_boot_size_gen2:
.long . - shmobile_boot_vector_gen2
#endif /* CONFIG_ARCH_RCAR_GEN2 */
/*
* Per-CPU SMP boot function/argument selection code based on MPIDR
*/
ENTRY(shmobile_smp_boot)
mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR
and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK
@ r0 = cpu_logical_map() value
mov r1, #0 @ r1 = CPU index
adr r2, 1f
ldmia r2, {r5, r6, r7}
add r5, r5, r2 @ array of per-cpu mpidr values
add r6, r6, r2 @ array of per-cpu functions
add r7, r7, r2 @ array of per-cpu arguments
shmobile_smp_boot_find_mpidr:
ldr r8, [r5, r1, lsl #2]
cmp r8, r0
bne shmobile_smp_boot_next
ldr r9, [r6, r1, lsl #2]
cmp r9, #0
bne shmobile_smp_boot_found
shmobile_smp_boot_next:
add r1, r1, #1
cmp r1, #NR_CPUS
blo shmobile_smp_boot_find_mpidr
b shmobile_smp_sleep
shmobile_smp_boot_found:
ldr r0, [r7, r1, lsl #2]
ret r9
ENDPROC(shmobile_smp_boot)
ENTRY(shmobile_smp_sleep)
wfi
b shmobile_smp_boot
ENDPROC(shmobile_smp_sleep)
.align 2
1: .long shmobile_smp_mpidr - .
.long shmobile_smp_fn - 1b
.long shmobile_smp_arg - 1b
.bss
.globl shmobile_smp_mpidr
shmobile_smp_mpidr:
.space NR_CPUS * 4
.globl shmobile_smp_fn
shmobile_smp_fn:
.space NR_CPUS * 4
.globl shmobile_smp_arg
shmobile_smp_arg:
.space NR_CPUS * 4
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