| Nariman Poushin | c703f90 | 2018-03-07 10:29:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| 9 | #include <platform_def.h> |
| 10 | #include <cortex_a75.h> |
| 11 | #include <cortex_a55.h> |
| 12 | |
| 13 | .globl plat_arm_calc_core_pos |
| 14 | .globl plat_reset_handler |
| 15 | |
| 16 | /* --------------------------------------------------------------------- |
| 17 | * unsigned int plat_arm_calc_core_pos(u_register_t mpidr) |
| 18 | * |
| 19 | * Function to calculate the core position on FVP. |
| 20 | * |
| 21 | * (ClusterId * MAX_CPUS_PER_CLUSTER * MAX_PE_PER_CPU) + |
| 22 | * (CPUId * MAX_PE_PER_CPU) + |
| 23 | * ThreadId |
| 24 | * |
| 25 | * which can be simplified as: |
| 26 | * |
| 27 | * ((ClusterId * MAX_CPUS_PER_CLUSTER + CPUId) * MAX_PE_PER_CPU) |
| 28 | * + ThreadId |
| 29 | * --------------------------------------------------------------------- |
| 30 | */ |
| 31 | func plat_arm_calc_core_pos |
| 32 | /* |
| 33 | * Check for MT bit in MPIDR. If not set, shift MPIDR to left to make it |
| 34 | * look as if in a multi-threaded implementation. |
| 35 | */ |
| 36 | tst x0, #MPIDR_MT_MASK |
| 37 | lsr x3, x0, #MPIDR_AFFINITY_BITS |
| 38 | csel x3, x3, x0, eq |
| 39 | |
| 40 | /* Extract individual affinity fields from MPIDR */ |
| 41 | ubfx x0, x3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS |
| 42 | ubfx x1, x3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS |
| 43 | ubfx x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS |
| 44 | |
| 45 | /* Compute linear position */ |
| 46 | mov x4, #PLAT_MAX_CPUS_PER_CLUSTER |
| 47 | madd x1, x2, x4, x1 |
| 48 | mov x5, #PLAT_MAX_PE_PER_CPU |
| 49 | madd x0, x1, x5, x0 |
| 50 | ret |
| 51 | endfunc plat_arm_calc_core_pos |
| 52 | |
| 53 | /* ------------------------------------------------------ |
| 54 | * Helper macro that reads the part number of the current |
| 55 | * CPU and jumps to the given label if it matches the CPU |
| 56 | * MIDR provided. |
| 57 | * |
| 58 | * Clobbers x0. |
| 59 | * ----------------------------------------------------- |
| 60 | */ |
| 61 | .macro jump_if_cpu_midr _cpu_midr, _label |
| 62 | mrs x0, midr_el1 |
| 63 | ubfx x0, x0, MIDR_PN_SHIFT, #12 |
| 64 | cmp w0, #((\_cpu_midr >> MIDR_PN_SHIFT) & MIDR_PN_MASK) |
| 65 | b.eq \_label |
| 66 | .endm |
| 67 | |
| 68 | /* ----------------------------------------------------- |
| 69 | * void plat_reset_handler(void); |
| 70 | * |
| 71 | * Determine the CPU MIDR and disable power down bit for |
| 72 | * that CPU. |
| 73 | * ----------------------------------------------------- |
| 74 | */ |
| 75 | func plat_reset_handler |
| 76 | jump_if_cpu_midr CORTEX_A75_MIDR, A75 |
| 77 | jump_if_cpu_midr CORTEX_A55_MIDR, A55 |
| 78 | ret |
| 79 | |
| 80 | /* ----------------------------------------------------- |
| 81 | * Disable CPU power down bit in power control register |
| 82 | * ----------------------------------------------------- |
| 83 | */ |
| 84 | A75: |
| 85 | mrs x0, CORTEX_A75_CPUPWRCTLR_EL1 |
| 86 | bic x0, x0, #CORTEX_A75_CORE_PWRDN_EN_MASK |
| 87 | msr CORTEX_A75_CPUPWRCTLR_EL1, x0 |
| 88 | isb |
| 89 | ret |
| 90 | A55: |
| 91 | mrs x0, CORTEX_A55_CPUPWRCTLR_EL1 |
| 92 | bic x0, x0, #CORTEX_A55_CORE_PWRDN_EN_MASK |
| 93 | msr CORTEX_A55_CPUPWRCTLR_EL1, x0 |
| 94 | isb |
| 95 | ret |
| 96 | endfunc plat_reset_handler |