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/*
* Copyright (c) 2019, 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_report.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-x17
* --------------------------------------------------
*/
func errata_dsu_798953_wa
mov x17, 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 x17
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-x3
* -----------------------------------------------------------------------
*/
.globl check_errata_dsu_936184
.globl errata_dsu_936184_wa
func check_errata_dsu_936184
mov x2, #ERRATA_NOT_APPLIES
mov x3, #ERRATA_APPLIES
/* Erratum applies only if DSU has the ACP interface */
mov x0, x2
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 x0, x1, #CLUSTERIDR_REV_SHIFT,\
#(CLUSTERIDR_REV_BITS + CLUSTERIDR_VAR_BITS)
mov x1, #(0x2 << CLUSTERIDR_VAR_SHIFT)
cmp x0, x1
csel x0, x2, x3, hs
1:
ret
endfunc check_errata_dsu_936184
/* --------------------------------------------------
* Errata Workaround for DSU erratum #936184.
*
* Can clobber only: x0-x17
* --------------------------------------------------
*/
func errata_dsu_936184_wa
mov x17, 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 x17
endfunc errata_dsu_936184_wa
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