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/*
* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch.h>
#include <asm_macros.S>
#include <platform_def.h>
#include "../drivers/pwrc/fvp_pwrc.h"
#include "../fvp_def.h"
.globl plat_secondary_cold_boot_setup
.globl plat_get_my_entrypoint
.globl plat_is_my_cpu_primary
/* --------------------------------------------------------------------
* void plat_secondary_cold_boot_setup (void);
*
* For AArch32, cold-booting secondary CPUs is not yet
* implemented and they panic.
* --------------------------------------------------------------------
*/
func plat_secondary_cold_boot_setup
cb_panic:
b cb_panic
endfunc plat_secondary_cold_boot_setup
/* ---------------------------------------------------------------------
* unsigned long plat_get_my_entrypoint (void);
*
* Main job of this routine is to distinguish between a cold and warm
* boot. On FVP, this information can be queried from the power
* controller. The Power Control SYS Status Register (PSYSR) indicates
* the wake-up reason for the CPU.
*
* For a cold boot, return 0.
* For a warm boot, read the mailbox and return the address it contains.
*
* TODO: PSYSR is a common register and should be
* accessed using locks. Since it is not possible
* to use locks immediately after a cold reset
* we are relying on the fact that after a cold
* reset all cpus will read the same WK field
* ---------------------------------------------------------------------
*/
func plat_get_my_entrypoint
/* ---------------------------------------------------------------------
* When bit PSYSR.WK indicates either "Wake by PPONR" or "Wake by GIC
* WakeRequest signal" then it is a warm boot.
* ---------------------------------------------------------------------
*/
ldcopr r2, MPIDR
ldr r1, =PWRC_BASE
str r2, [r1, #PSYSR_OFF]
ldr r2, [r1, #PSYSR_OFF]
ubfx r2, r2, #PSYSR_WK_SHIFT, #PSYSR_WK_WIDTH
cmp r2, #WKUP_PPONR
beq warm_reset
cmp r2, #WKUP_GICREQ
beq warm_reset
/* Cold reset */
mov r0, #0
bx lr
warm_reset:
/* ---------------------------------------------------------------------
* A mailbox is maintained in the trusted SRAM. It is flushed out of the
* caches after every update using normal memory so it is safe to read
* it here with SO attributes.
* ---------------------------------------------------------------------
*/
ldr r0, =PLAT_ARM_TRUSTED_MAILBOX_BASE
ldr r0, [r0]
cmp r0, #0
beq _panic
bx lr
/* ---------------------------------------------------------------------
* The power controller indicates this is a warm reset but the mailbox
* is empty. This should never happen!
* ---------------------------------------------------------------------
*/
_panic:
b _panic
endfunc plat_get_my_entrypoint
/* -----------------------------------------------------
* unsigned int plat_is_my_cpu_primary (void);
*
* Find out whether the current cpu is the primary
* cpu.
* -----------------------------------------------------
*/
func plat_is_my_cpu_primary
ldcopr r0, MPIDR
ldr r1, =(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)
and r0, r1
cmp r0, #FVP_PRIMARY_CPU
moveq r0, #1
movne r0, #0
bx lr
endfunc plat_is_my_cpu_primary