lib/cpus/aarch64/cortex_a510.S

/*
 * Copyright (c) 2022, ARM Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <asm_macros.S>
#include <common/bl_common.h>
#include <cortex_a510.h>
#include <cpu_macros.S>
#include <plat_macros.S>

/* Hardware handled coherency */
#if HW_ASSISTED_COHERENCY == 0
#error "Cortex-A510 must be compiled with HW_ASSISTED_COHERENCY enabled"
#endif

/* 64-bit only core */
#if CTX_INCLUDE_AARCH32_REGS == 1
#error "Cortex-A510 supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0"
#endif

	/* --------------------------------------------------
	 * Errata Workaround for Cortex-A510 Errata #1922240.
	 * This applies only to revision r0p0 (fixed in r0p1)
	 * x0: variant[4:7] and revision[0:3] of current cpu.
	 * Shall clobber: x0, x1, x17
	 * --------------------------------------------------
	 */
func errata_cortex_a510_1922240_wa
	/* Check workaround compatibility. */
	mov	x17, x30
	bl	check_errata_1922240
	cbz	x0, 1f

	/* Apply the workaround by setting IMP_CMPXACTLR_EL1[11:10] = 0b11. */
	mrs	x0, CORTEX_A510_CMPXACTLR_EL1
	mov	x1, #3
	bfi	x0, x1, #10, #2
	msr	CORTEX_A510_CMPXACTLR_EL1, x0

1:
	ret	x17
endfunc errata_cortex_a510_1922240_wa

func check_errata_1922240
	/* Applies to r0p0 only */
	mov	x1, #0x00
	b	cpu_rev_var_ls
endfunc check_errata_1922240

	/* ----------------------------------------------------
	 * HW will do the cache maintenance while powering down
	 * ----------------------------------------------------
	 */
func cortex_a510_core_pwr_dwn
	/* ---------------------------------------------------
	 * Enable CPU power down bit in power control register
	 * ---------------------------------------------------
	 */
	mrs	x0, CORTEX_A510_CPUPWRCTLR_EL1
	orr	x0, x0, #CORTEX_A510_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
	msr	CORTEX_A510_CPUPWRCTLR_EL1, x0
	isb
	ret
endfunc cortex_a510_core_pwr_dwn

	/*
	 * Errata printing function for Cortex-A510. Must follow AAPCS.
	 */
#if REPORT_ERRATA
func cortex_a510_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_A510_1922240, cortex_a510, 1922240

	ldp	x8, x30, [sp], #16
	ret
endfunc cortex_a510_errata_report
#endif

func cortex_a510_reset_func
	mov	x19, x30

	/* Disable speculative loads */
	msr	SSBS, xzr
	isb

	/* Get the CPU revision and stash it in x18. */
	bl	cpu_get_rev_var
	mov	x18, x0

#if ERRATA_A510_1922240
	mov	x0, x18
	bl	errata_cortex_a510_1922240_wa
#endif

	ret	x19
endfunc cortex_a510_reset_func

	/* ---------------------------------------------
	 * This function provides Cortex-A510 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_a510_regs, "aS"
cortex_a510_regs:  /* The ascii list of register names to be reported */
	.asciz	"cpuectlr_el1", ""

func cortex_a510_cpu_reg_dump
	adr	x6, cortex_a510_regs
	mrs	x8, CORTEX_A510_CPUECTLR_EL1
	ret
endfunc cortex_a510_cpu_reg_dump

declare_cpu_ops cortex_a510, CORTEX_A510_MIDR, \
	cortex_a510_reset_func, \
	cortex_a510_core_pwr_dwn