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/*
* Copyright (c) 2019-2023, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <asm_macros.S>
#include <dsu_def.h>
#include <lib/cpus/errata.h>
/* -----------------------------------------------------------------------
* DSU erratum 798953 check function
* Checks the DSU variant, revision and configuration to determine if
* the erratum applies. Erratum applies on all configurations of the
* DSU and if revision-variant is r0p0.
*
* The erratum was fixed in r0p1.
*
* This function is called from both assembly and C environment. So it
* follows AAPCS.
*
* Clobbers: x0-x3
* -----------------------------------------------------------------------
*/
.globl check_errata_dsu_798953
.globl errata_dsu_798953_wa
func check_errata_dsu_798953
mov x2, #ERRATA_APPLIES
mov x3, #ERRATA_NOT_APPLIES
/* Check if DSU is equal to r0p0 */
mrs x1, CLUSTERIDR_EL1
/* DSU variant and revision bitfields in CLUSTERIDR are adjacent */
ubfx x0, x1, #CLUSTERIDR_REV_SHIFT,\
#(CLUSTERIDR_REV_BITS + CLUSTERIDR_VAR_BITS)
mov x1, #(0x0 << CLUSTERIDR_REV_SHIFT)
cmp x0, x1
csel x0, x2, x3, EQ
ret
endfunc check_errata_dsu_798953
/* --------------------------------------------------
* Errata Workaround for DSU erratum #798953.
*
* Can clobber only: x0-x8
* --------------------------------------------------
*/
func errata_dsu_798953_wa
mov x8, x30
bl check_errata_dsu_798953
cbz x0, 1f
/* If erratum applies, disable high-level clock gating */
mrs x0, CLUSTERACTLR_EL1
orr x0, x0, #CLUSTERACTLR_EL1_DISABLE_CLOCK_GATING
msr CLUSTERACTLR_EL1, x0
isb
1:
ret x8
endfunc errata_dsu_798953_wa
/* -----------------------------------------------------------------------
* DSU erratum 936184 check function
* Checks the DSU variant, revision and configuration to determine if
* the erratum applies. Erratum applies if ACP interface is present
* in the DSU and revision-variant < r2p0.
*
* The erratum was fixed in r2p0.
*
* This function is called from both assembly and C environment. So it
* follows AAPCS.
*
* Clobbers: x0-x4
* -----------------------------------------------------------------------
*/
.globl check_errata_dsu_936184
.globl errata_dsu_936184_wa
.weak is_scu_present_in_dsu
/* --------------------------------------------------------------------
* Default behaviour respresents SCU is always present with DSU.
* CPUs can override this definition if required.
*
* Can clobber only: x0-x3
* --------------------------------------------------------------------
*/
func is_scu_present_in_dsu
mov x0, #1
ret
endfunc is_scu_present_in_dsu
func check_errata_dsu_936184
mov x4, x30
bl is_scu_present_in_dsu
cmp x0, xzr
/* Default error status */
mov x0, #ERRATA_NOT_APPLIES
/* If SCU is not present, return without applying patch */
b.eq 1f
/* Erratum applies only if DSU has the ACP interface */
mrs x1, CLUSTERCFR_EL1
ubfx x1, x1, #CLUSTERCFR_ACP_SHIFT, #1
cbz x1, 1f
/* If ACP is present, check if DSU is older than r2p0 */
mrs x1, CLUSTERIDR_EL1
/* DSU variant and revision bitfields in CLUSTERIDR are adjacent */
ubfx x2, x1, #CLUSTERIDR_REV_SHIFT,\
#(CLUSTERIDR_REV_BITS + CLUSTERIDR_VAR_BITS)
cmp x2, #(0x2 << CLUSTERIDR_VAR_SHIFT)
b.hs 1f
mov x0, #ERRATA_APPLIES
1:
ret x4
endfunc check_errata_dsu_936184
/* --------------------------------------------------
* Errata Workaround for DSU erratum #936184.
*
* Can clobber only: x0-x8
* --------------------------------------------------
*/
func errata_dsu_936184_wa
mov x8, x30
bl check_errata_dsu_936184
cbz x0, 1f
/* If erratum applies, we set a mask to a DSU control register */
mrs x0, CLUSTERACTLR_EL1
ldr x1, =DSU_ERRATA_936184_MASK
orr x0, x0, x1
msr CLUSTERACTLR_EL1, x0
isb
1:
ret x8
endfunc errata_dsu_936184_wa
/* -----------------------------------------------------------------------
* DSU erratum 2313941 check function
* Checks the DSU variant, revision and configuration to determine if
* the erratum applies. Erratum applies on all configurations of the
* DSU and if revision-variant is r0p0, r1p0, r2p0, r2p1, r3p0, r3p1.
*
* The erratum is still open.
*
* This function is called from both assembly and C environment. So it
* follows AAPCS.
*
* Clobbers: x0-x3
* -----------------------------------------------------------------------
*/
.globl check_errata_dsu_2313941
.globl errata_dsu_2313941_wa
func check_errata_dsu_2313941
mov x2, #ERRATA_APPLIES
mov x3, #ERRATA_NOT_APPLIES
/* Check if DSU version is less than or equal to r3p1 */
mrs x1, CLUSTERIDR_EL1
/* DSU variant and revision bitfields in CLUSTERIDR are adjacent */
ubfx x0, x1, #CLUSTERIDR_REV_SHIFT,\
#(CLUSTERIDR_REV_BITS + CLUSTERIDR_VAR_BITS)
mov x1, #(0x31 << CLUSTERIDR_REV_SHIFT)
cmp x0, x1
csel x0, x2, x3, LS
ret
endfunc check_errata_dsu_2313941
/* --------------------------------------------------
* Errata Workaround for DSU erratum #2313941.
*
* Can clobber only: x0-x8
* --------------------------------------------------
*/
func errata_dsu_2313941_wa
mov x8, x30
bl check_errata_dsu_2313941
cbz x0, 1f
/* If erratum applies, disable high-level clock gating */
mrs x0, CLUSTERACTLR_EL1
orr x0, x0, #CLUSTERACTLR_EL1_DISABLE_SCLK_GATING
msr CLUSTERACTLR_EL1, x0
isb
1:
ret x8
endfunc errata_dsu_2313941_wa
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