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/*
* Copyright (c) 2013-2014, 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 <bl_common.h>
#include <fvp_def.h>
#include <gic_v2.h>
#include "../drivers/pwrc/fvp_pwrc.h"
.globl platform_get_entrypoint
.globl plat_secondary_cold_boot_setup
.globl platform_mem_init
.globl plat_report_exception
.macro platform_choose_gicmmap param1, param2, x_tmp, w_tmp, res
ldr \x_tmp, =VE_SYSREGS_BASE + V2M_SYS_ID
ldr \w_tmp, [\x_tmp]
ubfx \w_tmp, \w_tmp, #SYS_ID_BLD_SHIFT, #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
/* ---------------------------------------------
* 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]
/* ---------------------------------------------
* Deactivate the gic cpu interface as well
* ---------------------------------------------
*/
ldr x0, =VE_GICC_BASE
ldr x1, =BASE_GICC_BASE
platform_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]
/* ---------------------------------------------
* 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
/* -----------------------------------------------------
* void platform_get_entrypoint (unsigned int mpid);
*
* Main job of this routine is to distinguish between
* a cold and warm boot.
* On a cold boot the secondaries first wait for the
* platform to be initialized after which they are
* hotplugged in. The primary proceeds to perform the
* platform initialization.
* On a warm boot, each cpu jumps to the address in its
* mailbox.
*
* TODO: Not a good idea to save lr in a temp reg
* TODO: PSYSR is a common register and should be
* accessed using locks. Since its 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 platform_get_entrypoint
mov x9, x30 // lr
mov x2, x0
ldr x1, =PWRC_BASE
str w2, [x1, #PSYSR_OFF]
ldr w2, [x1, #PSYSR_OFF]
ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_MASK
cbnz w2, warm_reset
mov x0, x2
b exit
warm_reset:
/* ---------------------------------------------
* A per-cpu mailbox is maintained in the tru-
* sted DRAM. Its flushed out of the caches
* after every update using normal memory so
* its safe to read it here with SO attributes
* ---------------------------------------------
*/
ldr x10, =TZDRAM_BASE + MBOX_OFF
bl platform_get_core_pos
lsl x0, x0, #CACHE_WRITEBACK_SHIFT
ldr x0, [x10, x0]
cbz x0, _panic
exit:
ret x9
_panic: b _panic
/* -----------------------------------------------------
* void platform_mem_init (void);
*
* Zero out the mailbox registers in the TZDRAM. The
* mmu is turned off right now and only the primary can
* ever execute this code. Secondaries will read the
* mailboxes using SO accesses. In short, BL31 will
* update the mailboxes after mapping the tzdram as
* normal memory. It will flush its copy after update.
* BL1 will always read the mailboxes with the MMU off
* -----------------------------------------------------
*/
func platform_mem_init
ldr x0, =TZDRAM_BASE + MBOX_OFF
mov w1, #PLATFORM_CORE_COUNT
loop:
str xzr, [x0], #CACHE_WRITEBACK_GRANULE
subs w1, w1, #1
b.gt loop
ret
/* ---------------------------------------------
* void plat_report_exception(unsigned int type)
* Function to report an unhandled exception
* with platform-specific means.
* On FVP platform, it updates the LEDs
* to indicate where we are
* ---------------------------------------------
*/
func plat_report_exception
mrs x1, CurrentEl
lsr x1, x1, #MODE_EL_SHIFT
lsl x1, x1, #SYS_LED_EL_SHIFT
lsl x0, x0, #SYS_LED_EC_SHIFT
mov x2, #(SECURE << SYS_LED_SS_SHIFT)
orr x0, x0, x2
orr x0, x0, x1
mov x1, #VE_SYSREGS_BASE
add x1, x1, #V2M_SYS_LED
str w0, [x1]
ret