/*
* Copyright (c) 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 <cortex_a53.h>
#include <cpu_macros.S>
#include <plat_macros.S>
/* ---------------------------------------------
* Disable L1 data cache and unified L2 cache
* ---------------------------------------------
*/
func cortex_a53_disable_dcache
mrs x1, sctlr_el3
bic x1, x1, #SCTLR_C_BIT
msr sctlr_el3, x1
isb
ret
endfunc cortex_a53_disable_dcache
/* ---------------------------------------------
* Disable intra-cluster coherency
* ---------------------------------------------
*/
func cortex_a53_disable_smp
mrs x0, CPUECTLR_EL1
bic x0, x0, #CPUECTLR_SMP_BIT
msr CPUECTLR_EL1, x0
isb
dsb sy
ret
endfunc cortex_a53_disable_smp
/* --------------------------------------------------
* Errata Workaround for Cortex A53 Errata #826319.
* This applies only to revision <= r0p2 of Cortex A53.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Clobbers : x0 - x5
* --------------------------------------------------
*/
func errata_a53_826319_wa
/*
* Compare x0 against revision r0p2
*/
cmp x0, #2
b.ls apply_826319
#if DEBUG
b print_revision_warning
#else
ret
#endif
apply_826319:
mrs x1, L2ACTLR_EL1
bic x1, x1, #L2ACTLR_ENABLE_UNIQUECLEAN
orr x1, x1, #L2ACTLR_DISABLE_CLEAN_PUSH
msr L2ACTLR_EL1, x1
ret
endfunc errata_a53_826319_wa
/* --------------------------------------------------
* Errata Workaround for Cortex A53 Errata #836870.
* This applies only to revision <= r0p3 of Cortex A53.
* From r0p4 and onwards, this errata is enabled by
* default.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Clobbers : x0 - x5
* --------------------------------------------------
*/
func errata_a53_836870_wa
/*
* Compare x0 against revision r0p3
*/
cmp x0, #3
b.ls apply_836870
#if DEBUG
b print_revision_warning
#else
ret
#endif
apply_836870:
mrs x1, CPUACTLR_EL1
orr x1, x1, #CPUACTLR_DTAH
msr CPUACTLR_EL1, x1
ret
endfunc errata_a53_836870_wa
/* -------------------------------------------------
* The CPU Ops reset function for Cortex-A53.
* Clobbers: x0-x5, x15, x19, x30
* -------------------------------------------------
*/
func cortex_a53_reset_func
mov x19, x30
mrs x0, midr_el1
/*
* Extract the variant[20:23] and revision[0:3] from x0
* and pack it in x15[0:7] as variant[4:7] and revision[0:3].
* First extract x0[16:23] to x15[0:7] and zero fill the rest.
* Then extract x0[0:3] into x15[0:3] retaining other bits.
*/
ubfx x15, x0, #(MIDR_VAR_SHIFT - MIDR_REV_BITS), \
#(MIDR_REV_BITS + MIDR_VAR_BITS)
bfxil x15, x0, #MIDR_REV_SHIFT, #MIDR_REV_BITS
#if ERRATA_A53_826319
mov x0, x15
bl errata_a53_826319_wa
#endif
#if ERRATA_A53_836870
mov x0, x15
bl errata_a53_836870_wa
#endif
/* ---------------------------------------------
* As a bare minimum enable the SMP bit if it is
* not already set.
* ---------------------------------------------
*/
mrs x0, CPUECTLR_EL1
tst x0, #CPUECTLR_SMP_BIT
b.ne skip_smp_setup
orr x0, x0, #CPUECTLR_SMP_BIT
msr CPUECTLR_EL1, x0
skip_smp_setup:
isb
ret x19
endfunc cortex_a53_reset_func
func cortex_a53_core_pwr_dwn
mov x18, x30
/* ---------------------------------------------
* Turn off caches.
* ---------------------------------------------
*/
bl cortex_a53_disable_dcache
/* ---------------------------------------------
* Flush L1 caches.
* ---------------------------------------------
*/
mov x0, #DCCISW
bl dcsw_op_level1
/* ---------------------------------------------
* Come out of intra cluster coherency
* ---------------------------------------------
*/
mov x30, x18
b cortex_a53_disable_smp
endfunc cortex_a53_core_pwr_dwn
func cortex_a53_cluster_pwr_dwn
mov x18, x30
/* ---------------------------------------------
* Turn off caches.
* ---------------------------------------------
*/
bl cortex_a53_disable_dcache
/* ---------------------------------------------
* Flush L1 caches.
* ---------------------------------------------
*/
mov x0, #DCCISW
bl dcsw_op_level1
/* ---------------------------------------------
* Disable the optional ACP.
* ---------------------------------------------
*/
bl plat_disable_acp
/* ---------------------------------------------
* Flush L2 caches.
* ---------------------------------------------
*/
mov x0, #DCCISW
bl dcsw_op_level2
/* ---------------------------------------------
* Come out of intra cluster coherency
* ---------------------------------------------
*/
mov x30, x18
b cortex_a53_disable_smp
endfunc cortex_a53_cluster_pwr_dwn
/* ---------------------------------------------
* This function provides cortex_a53 specific
* register information for crash reporting.
* It needs to return with x6 pointing to
* a list of register names in ascii and
* x8 - x15 having values of registers to be
* reported.
* ---------------------------------------------
*/
.section .rodata.cortex_a53_regs, "aS"
cortex_a53_regs: /* The ascii list of register names to be reported */
.asciz "cpuectlr_el1", ""
func cortex_a53_cpu_reg_dump
adr x6, cortex_a53_regs
mrs x8, CPUECTLR_EL1
ret
endfunc cortex_a53_cpu_reg_dump
declare_cpu_ops cortex_a53, CORTEX_A53_MIDR
