| /* |
| * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <platform_def.h> |
| #include <cortex_a75.h> |
| |
| .globl plat_arm_calc_core_pos |
| .globl plat_reset_handler |
| |
| /* ----------------------------------------------------- |
| * unsigned int plat_arm_calc_core_pos(u_register_t mpidr) |
| * |
| * Helper function to calculate the core position. |
| * (ClusterId * CSS_SGI_MAX_CPUS_PER_CLUSTER * CSS_SGI_MAX_PE_PER_CPU) + |
| * (CPUId * CSS_SGI_MAX_PE_PER_CPU) + |
| * ThreadId |
| * |
| * which can be simplified as: |
| * |
| * ((ClusterId * CSS_SGI_MAX_CPUS_PER_CLUSTER + CPUId) * |
| * CSS_SGI_MAX_PE_PER_CPU) + ThreadId |
| * ------------------------------------------------------ |
| */ |
| |
| func plat_arm_calc_core_pos |
| mov x3, x0 |
| |
| /* |
| * The MT bit in MPIDR is always set for SGI platforms |
| * and the affinity level 0 corresponds to thread affinity level. |
| */ |
| |
| /* Extract individual affinity fields from MPIDR */ |
| ubfx x0, x3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS |
| ubfx x1, x3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS |
| ubfx x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS |
| |
| /* Compute linear position */ |
| mov x4, #CSS_SGI_MAX_CPUS_PER_CLUSTER |
| madd x1, x2, x4, x1 |
| mov x5, #CSS_SGI_MAX_PE_PER_CPU |
| madd x0, x1, x5, x0 |
| ret |
| endfunc plat_arm_calc_core_pos |
| |
| /* ------------------------------------------------------ |
| * Helper macro that reads the part number of the current |
| * CPU and jumps to the given label if it matches the CPU |
| * MIDR provided. |
| * |
| * Clobbers x0. |
| * ----------------------------------------------------- |
| */ |
| .macro jump_if_cpu_midr _cpu_midr, _label |
| mrs x0, midr_el1 |
| ubfx x0, x0, MIDR_PN_SHIFT, #12 |
| cmp w0, #((\_cpu_midr >> MIDR_PN_SHIFT) & MIDR_PN_MASK) |
| b.eq \_label |
| .endm |
| |
| /* ----------------------------------------------------- |
| * void plat_reset_handler(void); |
| * |
| * Determine the CPU MIDR and disable power down bit for |
| * that CPU. |
| * ----------------------------------------------------- |
| */ |
| func plat_reset_handler |
| jump_if_cpu_midr CORTEX_A75_MIDR, A75 |
| ret |
| |
| /* ----------------------------------------------------- |
| * Disable CPU power down bit in power control register |
| * ----------------------------------------------------- |
| */ |
| A75: |
| mrs x0, CORTEX_A75_CPUPWRCTLR_EL1 |
| bic x0, x0, #CORTEX_A75_CORE_PWRDN_EN_MASK |
| msr CORTEX_A75_CPUPWRCTLR_EL1, x0 |
| isb |
| ret |
| endfunc plat_reset_handler |
