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/*
* Copyright (c) 2020-2022, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <asm_macros.S>
#include <context.h>
#include <cpu_macros.S>
#include <cpuamu.h>
#include <rainier.h>
/* Hardware handled coherency */
#if HW_ASSISTED_COHERENCY == 0
#error "Rainier CPU must be compiled with HW_ASSISTED_COHERENCY enabled"
#endif
/* 64-bit only core */
#if CTX_INCLUDE_AARCH32_REGS == 1
#error "Rainier CPU supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
#endif
/* --------------------------------------------------
* Disable speculative loads if Rainier supports
* SSBS.
*
* Shall clobber: x0.
* --------------------------------------------------
*/
func rainier_disable_speculative_loads
/* Check if the PE implements SSBS */
mrs x0, id_aa64pfr1_el1
tst x0, #(ID_AA64PFR1_EL1_SSBS_MASK << ID_AA64PFR1_EL1_SSBS_SHIFT)
b.eq 1f
/* Disable speculative loads */
msr SSBS, xzr
1:
ret
endfunc rainier_disable_speculative_loads
/* --------------------------------------------------
* Errata Workaround for Neoverse N1 Errata #1868343.
* This applies to revision <= r4p0 of Neoverse N1.
* This workaround is the same as the workaround for
* errata 1262606 and 1275112 but applies to a wider
* revision range.
* Rainier R0P0 is based on Neoverse N1 R4P0 so the
* workaround checks for r0p0 version of Rainier CPU.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Shall clobber: x0, x1 & x17
* --------------------------------------------------
*/
func errata_n1_1868343_wa
/*
* Compare x0 against revision r4p0
*/
mov x17, x30
bl check_errata_1868343
cbz x0, 1f
mrs x1, RAINIER_CPUACTLR_EL1
orr x1, x1, RAINIER_CPUACTLR_EL1_BIT_13
msr RAINIER_CPUACTLR_EL1, x1
isb
1:
ret x17
endfunc errata_n1_1868343_wa
func check_errata_1868343
/* Applies to r0p0 of Rainier CPU */
mov x1, #0x00
b cpu_rev_var_ls
endfunc check_errata_1868343
func rainier_reset_func
mov x19, x30
bl rainier_disable_speculative_loads
/* Forces all cacheable atomic instructions to be near */
mrs x0, RAINIER_CPUACTLR2_EL1
orr x0, x0, #RAINIER_CPUACTLR2_EL1_BIT_2
msr RAINIER_CPUACTLR2_EL1, x0
isb
bl cpu_get_rev_var
mov x18, x0
#if ERRATA_N1_1868343
mov x0, x18
bl errata_n1_1868343_wa
#endif
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, actlr_el3
orr x0, x0, #RAINIER_ACTLR_AMEN_BIT
msr actlr_el3, x0
/* Make sure accesses from EL0/EL1 are not trapped to EL2 */
mrs x0, actlr_el2
orr x0, x0, #RAINIER_ACTLR_AMEN_BIT
msr actlr_el2, x0
/* Enable group0 counters */
mov x0, #RAINIER_AMU_GROUP0_MASK
msr CPUAMCNTENSET_EL0, x0
#endif
isb
ret x19
endfunc rainier_reset_func
/* ---------------------------------------------
* HW will do the cache maintenance while powering down
* ---------------------------------------------
*/
func rainier_core_pwr_dwn
/* ---------------------------------------------
* Enable CPU power down bit in power control register
* ---------------------------------------------
*/
mrs x0, RAINIER_CPUPWRCTLR_EL1
orr x0, x0, #RAINIER_CORE_PWRDN_EN_MASK
msr RAINIER_CPUPWRCTLR_EL1, x0
isb
ret
endfunc rainier_core_pwr_dwn
#if REPORT_ERRATA
/*
* Errata printing function for Rainier. Must follow AAPCS.
*/
func rainier_errata_report
stp x8, x30, [sp, #-16]!
bl cpu_get_rev_var
mov x8, x0
/*
* Report all errata. The revision-variant information is passed to
* checking functions of each errata.
*/
report_errata ERRATA_N1_1868343, rainier, 1868343
ldp x8, x30, [sp], #16
ret
endfunc rainier_errata_report
#endif
/* ---------------------------------------------
* This function provides Rainier 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.rainier_regs, "aS"
rainier_regs: /* The ascii list of register names to be reported */
.asciz "cpuectlr_el1", ""
func rainier_cpu_reg_dump
adr x6, rainier_regs
mrs x8, RAINIER_CPUECTLR_EL1
ret
endfunc rainier_cpu_reg_dump
declare_cpu_ops rainier, RAINIER_MIDR, \
rainier_reset_func, \
rainier_core_pwr_dwn
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