/* * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include /* --------------------------------------------- * Disable L1 data cache and unified L2 cache * --------------------------------------------- */ func cortex_a53_disable_dcache mrs x1, sctlr_el3 bic x1, x1, #SCTLR_C_BIT msr sctlr_el3, x1 isb ret endfunc cortex_a53_disable_dcache /* --------------------------------------------- * Disable intra-cluster coherency * --------------------------------------------- */ func cortex_a53_disable_smp mrs x0, CPUECTLR_EL1 bic x0, x0, #CPUECTLR_SMP_BIT msr CPUECTLR_EL1, x0 isb dsb sy ret endfunc cortex_a53_disable_smp /* -------------------------------------------------- * Errata Workaround for Cortex A53 Errata #826319. * This applies only to revision <= r0p2 of Cortex A53. * Inputs: * x0: variant[4:7] and revision[0:3] of current cpu. * Clobbers : x0 - x5 * -------------------------------------------------- */ func errata_a53_826319_wa /* * Compare x0 against revision r0p2 */ cmp x0, #2 b.ls apply_826319 #if DEBUG b print_revision_warning #else ret #endif apply_826319: mrs x1, L2ACTLR_EL1 bic x1, x1, #L2ACTLR_ENABLE_UNIQUECLEAN orr x1, x1, #L2ACTLR_DISABLE_CLEAN_PUSH msr L2ACTLR_EL1, x1 ret endfunc errata_a53_826319_wa /* --------------------------------------------------------------------- * Disable the cache non-temporal hint. * * This ignores the Transient allocation hint in the MAIR and treats * allocations the same as non-transient allocation types. As a result, * the LDNP and STNP instructions in AArch64 behave the same as the * equivalent LDP and STP instructions. * * This is relevant only for revisions <= r0p3 of Cortex-A53. * From r0p4 and onwards, the bit to disable the hint is enabled by * default at reset. * * Inputs: * x0: variant[4:7] and revision[0:3] of current cpu. * Clobbers : x0 - x5 * --------------------------------------------------------------------- */ func a53_disable_non_temporal_hint /* * Compare x0 against revision r0p3 */ cmp x0, #3 b.ls disable_hint #if DEBUG b print_revision_warning #else ret #endif disable_hint: mrs x1, CPUACTLR_EL1 orr x1, x1, #CPUACTLR_DTAH msr CPUACTLR_EL1, x1 ret endfunc a53_disable_non_temporal_hint /* ------------------------------------------------- * The CPU Ops reset function for Cortex-A53. * Clobbers: x0-x5, x15, x19, x30 * ------------------------------------------------- */ func cortex_a53_reset_func mov x19, x30 mrs x0, midr_el1 /* * Extract the variant[20:23] and revision[0:3] from x0 * and pack it in x15[0:7] as variant[4:7] and revision[0:3]. * First extract x0[16:23] to x15[0:7] and zero fill the rest. * Then extract x0[0:3] into x15[0:3] retaining other bits. */ ubfx x15, x0, #(MIDR_VAR_SHIFT - MIDR_REV_BITS), \ #(MIDR_REV_BITS + MIDR_VAR_BITS) bfxil x15, x0, #MIDR_REV_SHIFT, #MIDR_REV_BITS #if ERRATA_A53_826319 mov x0, x15 bl errata_a53_826319_wa #endif #if ERRATA_A53_836870 || A53_DISABLE_NON_TEMPORAL_HINT mov x0, x15 bl a53_disable_non_temporal_hint #endif /* --------------------------------------------- * Enable the SMP bit. * --------------------------------------------- */ mrs x0, CPUECTLR_EL1 orr x0, x0, #CPUECTLR_SMP_BIT msr CPUECTLR_EL1, x0 isb ret x19 endfunc cortex_a53_reset_func func cortex_a53_core_pwr_dwn mov x18, x30 /* --------------------------------------------- * Turn off caches. * --------------------------------------------- */ bl cortex_a53_disable_dcache /* --------------------------------------------- * Flush L1 caches. * --------------------------------------------- */ mov x0, #DCCISW bl dcsw_op_level1 /* --------------------------------------------- * Come out of intra cluster coherency * --------------------------------------------- */ mov x30, x18 b cortex_a53_disable_smp endfunc cortex_a53_core_pwr_dwn func cortex_a53_cluster_pwr_dwn mov x18, x30 /* --------------------------------------------- * Turn off caches. * --------------------------------------------- */ bl cortex_a53_disable_dcache /* --------------------------------------------- * Flush L1 caches. * --------------------------------------------- */ mov x0, #DCCISW bl dcsw_op_level1 /* --------------------------------------------- * Disable the optional ACP. * --------------------------------------------- */ bl plat_disable_acp /* --------------------------------------------- * Flush L2 caches. * --------------------------------------------- */ mov x0, #DCCISW bl dcsw_op_level2 /* --------------------------------------------- * Come out of intra cluster coherency * --------------------------------------------- */ mov x30, x18 b cortex_a53_disable_smp endfunc cortex_a53_cluster_pwr_dwn /* --------------------------------------------- * This function provides cortex_a53 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_a53_regs, "aS" cortex_a53_regs: /* The ascii list of register names to be reported */ .asciz "cpuectlr_el1", "" func cortex_a53_cpu_reg_dump adr x6, cortex_a53_regs mrs x8, CPUECTLR_EL1 ret endfunc cortex_a53_cpu_reg_dump declare_cpu_ops cortex_a53, CORTEX_A53_MIDR