| /* |
| * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <asm_macros.S> |
| #include <dsu_def.h> |
| #include <errata_report.h> |
| |
| /* ----------------------------------------------------------------------- |
| * 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_REV_BITS) |
| 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 |
