/*
* Copyright (c) 2013-2015, 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 <gicv2.h>
#include <gicv3.h>
#include <platform_def.h>
#include <v2m_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
.macro fvp_choose_gicmmap param1, param2, x_tmp, w_tmp, res
ldr \x_tmp, =V2M_SYSREGS_BASE + V2M_SYS_ID
ldr \w_tmp, [\x_tmp]
ubfx \w_tmp, \w_tmp, #V2M_SYS_ID_BLD_SHIFT, #V2M_SYS_ID_BLD_LENGTH
cmp \w_tmp, #BLD_GIC_VE_MMAP
csel \res, \param1, \param2, eq
.endm
/* -----------------------------------------------------
* void plat_secondary_cold_boot_setup (void);
*
* This function performs any platform specific actions
* needed for a secondary cpu after a cold reset e.g
* mark the cpu's presence, mechanism to place it in a
* holding pen etc.
* TODO: Should we read the PSYS register to make sure
* that the request has gone through.
* -----------------------------------------------------
*/
func plat_secondary_cold_boot_setup
#ifndef EL3_PAYLOAD_BASE
/* ---------------------------------------------
* Power down this cpu.
* TODO: Do we need to worry about powering the
* cluster down as well here. That will need
* locks which we won't have unless an elf-
* loader zeroes out the zi section.
* ---------------------------------------------
*/
mrs x0, mpidr_el1
ldr x1, =PWRC_BASE
str w0, [x1, #PPOFFR_OFF]
/* ---------------------------------------------
* Disable GIC bypass as well
* ---------------------------------------------
*/
/* Check for GICv3 system register access */
mrs x0, id_aa64pfr0_el1
ubfx x0, x0, #ID_AA64PFR0_GIC_SHIFT, #ID_AA64PFR0_GIC_WIDTH
cmp x0, #1
b.ne gicv2_bypass_disable
/* Check for SRE enable */
mrs x1, ICC_SRE_EL3
tst x1, #ICC_SRE_SRE_BIT
b.eq gicv2_bypass_disable
mrs x2, ICC_SRE_EL3
orr x2, x2, #(ICC_SRE_DIB_BIT | ICC_SRE_DFB_BIT)
msr ICC_SRE_EL3, x2
b secondary_cold_boot_wait
gicv2_bypass_disable:
ldr x0, =VE_GICC_BASE
ldr x1, =BASE_GICC_BASE
fvp_choose_gicmmap x0, x1, x2, w2, x1
mov w0, #(IRQ_BYP_DIS_GRP1 | FIQ_BYP_DIS_GRP1)
orr w0, w0, #(IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP0)
str w0, [x1, #GICC_CTLR]
secondary_cold_boot_wait:
/* ---------------------------------------------
* There is no sane reason to come out of this
* wfi so panic if we do. This cpu will be pow-
* ered on and reset by the cpu_on pm api
* ---------------------------------------------
*/
dsb sy
wfi
cb_panic:
b cb_panic
#else
mov_imm x0, PLAT_ARM_TRUSTED_MAILBOX_BASE
/* Wait until the entrypoint gets populated */
poll_mailbox:
ldr x1, [x0]
cbz x1, 1f
br x1
1:
wfe
b poll_mailbox
#endif /* EL3_PAYLOAD_BASE */
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.
* ---------------------------------------------------------------------
*/
mrs x2, mpidr_el1
ldr x1, =PWRC_BASE
str w2, [x1, #PSYSR_OFF]
ldr w2, [x1, #PSYSR_OFF]
ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_WIDTH
cmp w2, #WKUP_PPONR
beq warm_reset
cmp w2, #WKUP_GICREQ
beq warm_reset
/* Cold reset */
mov x0, #0
ret
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.
* ---------------------------------------------------------------------
*/
mov_imm x0, PLAT_ARM_TRUSTED_MAILBOX_BASE
ldr x0, [x0]
cbz x0, _panic
ret
/* ---------------------------------------------------------------------
* 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
mrs x0, mpidr_el1
and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)
cmp x0, #FVP_PRIMARY_CPU
cset w0, eq
ret
endfunc plat_is_my_cpu_primary
