/* * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include /* * DSU erratum 936184 * Check the DSU variant, revision and configuration to determine if the * erratum applies. This 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 ACP interface is present in DSU */ 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 func errata_dsu_936184_wa mov x20, 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 x20 endfunc errata_dsu_936184_wa