lib/cpus/aarch64/cortex_ares.S

/*
 * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <asm_macros.S>
#include <cortex_ares.h>
#include <cpuamu.h>
#include <cpu_macros.S>

/* --------------------------------------------------
 * Errata Workaround for Cortex-Ares Errata
 * This applies to revision r0p0 and r1p0 of Cortex-Ares.
 * Inputs:
 * x0: variant[4:7] and revision[0:3] of current cpu.
 * Shall clobber: x0-x17
 * --------------------------------------------------
 */
func errata_ares_1043202_wa
	/* Compare x0 against revision r1p0 */
	mov	x17, x30
	bl	check_errata_1043202
	cbz	x0, 1f

	/* Apply instruction patching sequence */
	ldr	x0, =0x0
	msr	CPUPSELR_EL3, x0
	ldr	x0, =0xF3BF8F2F
	msr	CPUPOR_EL3, x0
	ldr	x0, =0xFFFFFFFF
	msr	CPUPMR_EL3, x0
	ldr	x0, =0x800200071
	msr	CPUPCR_EL3, x0
	isb
1:
	ret	x17
endfunc errata_ares_1043202_wa

func check_errata_1043202
	/* Applies to r0p0 and r1p0 */
	mov	x1, #0x10
	b	cpu_rev_var_ls
endfunc check_errata_1043202

func cortex_ares_reset_func
	mov	x19, x30
	bl	cpu_get_rev_var
	mov	x18, x0

#if ERRATA_ARES_1043202
	mov	x0, x18
	bl	errata_ares_1043202_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, #CORTEX_ARES_ACTLR_AMEN_BIT
	msr	actlr_el3, x0
	isb

	/* Make sure accesses from EL0/EL1 are not trapped to EL2 */
	mrs	x0, actlr_el2
	orr	x0, x0, #CORTEX_ARES_ACTLR_AMEN_BIT
	msr	actlr_el2, x0
	isb

	/* Enable group0 counters */
	mov	x0, #CORTEX_ARES_AMU_GROUP0_MASK
	msr	CPUAMCNTENSET_EL0, x0
	isb
#endif
	ret	x19
endfunc cortex_ares_reset_func

	/* ---------------------------------------------
	 * HW will do the cache maintenance while powering down
	 * ---------------------------------------------
	 */
func cortex_ares_core_pwr_dwn
	/* ---------------------------------------------
	 * Enable CPU power down bit in power control register
	 * ---------------------------------------------
	 */
	mrs	x0, CORTEX_ARES_CPUPWRCTLR_EL1
	orr	x0, x0, #CORTEX_ARES_CORE_PWRDN_EN_MASK
	msr	CORTEX_ARES_CPUPWRCTLR_EL1, x0
	isb
	ret
endfunc cortex_ares_core_pwr_dwn

#if REPORT_ERRATA
/*
 * Errata printing function for Cortex-Ares. Must follow AAPCS.
 */
func cortex_a72_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_ARES_1043202, cortex_ares, 1043202

	ldp	x8, x30, [sp], #16
	ret
endfunc cortex_a72_errata_report
#endif

	/* ---------------------------------------------
	 * This function provides cortex_ares 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_ares_regs, "aS"
cortex_ares_regs:  /* The ascii list of register names to be reported */
	.asciz	"cpuectlr_el1", ""

func cortex_ares_cpu_reg_dump
	adr	x6, cortex_ares_regs
	mrs	x8, CORTEX_ARES_CPUECTLR_EL1
	ret
endfunc cortex_ares_cpu_reg_dump

declare_cpu_ops cortex_ares, CORTEX_ARES_MIDR, \
	cortex_ares_reset_func, \
	cortex_ares_core_pwr_dwn