| johpow01 | f0c8b26 | 2021-07-07 17:06:07 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2021, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| 9 | #include <common/bl_common.h> |
| 10 | #include <cortex_demeter.h> |
| 11 | #include <cpu_macros.S> |
| 12 | #include <plat_macros.S> |
| 13 | |
| 14 | /* Hardware handled coherency */ |
| 15 | #if HW_ASSISTED_COHERENCY == 0 |
| 16 | #error "Cortex Demeter must be compiled with HW_ASSISTED_COHERENCY enabled" |
| 17 | #endif |
| 18 | |
| 19 | /* 64-bit only core */ |
| 20 | #if CTX_INCLUDE_AARCH32_REGS == 1 |
| 21 | #error "Cortex Demeter supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0" |
| 22 | #endif |
| 23 | |
| 24 | /* ---------------------------------------------------- |
| 25 | * HW will do the cache maintenance while powering down |
| 26 | * ---------------------------------------------------- |
| 27 | */ |
| 28 | func cortex_demeter_core_pwr_dwn |
| 29 | /* --------------------------------------------------- |
| 30 | * Enable CPU power down bit in power control register |
| 31 | * --------------------------------------------------- |
| 32 | */ |
| 33 | mrs x0, CORTEX_DEMETER_CPUPWRCTLR_EL1 |
| 34 | orr x0, x0, #CORTEX_DEMETER_CPUPWRCTLR_EL1_CORE_PWRDN_BIT |
| 35 | msr CORTEX_DEMETER_CPUPWRCTLR_EL1, x0 |
| 36 | isb |
| 37 | ret |
| 38 | endfunc cortex_demeter_core_pwr_dwn |
| 39 | |
| 40 | #if REPORT_ERRATA |
| 41 | /* |
| 42 | * Errata printing function for Cortex Demeter. Must follow AAPCS. |
| 43 | */ |
| 44 | func cortex_demeter_errata_report |
| 45 | ret |
| 46 | endfunc cortex_demeter_errata_report |
| 47 | #endif |
| 48 | |
| 49 | func cortex_demeter_reset_func |
| 50 | /* Disable speculative loads */ |
| 51 | msr SSBS, xzr |
| 52 | isb |
| 53 | ret |
| 54 | endfunc cortex_demeter_reset_func |
| 55 | |
| 56 | /* --------------------------------------------- |
| 57 | * This function provides Cortex Demeter- |
| 58 | * specific register information for crash |
| 59 | * reporting. It needs to return with x6 |
| 60 | * pointing to a list of register names in ascii |
| 61 | * and x8 - x15 having values of registers to be |
| 62 | * reported. |
| 63 | * --------------------------------------------- |
| 64 | */ |
| 65 | .section .rodata.cortex_demeter_regs, "aS" |
| 66 | cortex_demeter_regs: /* The ascii list of register names to be reported */ |
| 67 | .asciz "cpuectlr_el1", "" |
| 68 | |
| 69 | func cortex_demeter_cpu_reg_dump |
| 70 | adr x6, cortex_demeter_regs |
| 71 | mrs x8, CORTEX_DEMETER_CPUECTLR_EL1 |
| 72 | ret |
| 73 | endfunc cortex_demeter_cpu_reg_dump |
| 74 | |
| 75 | declare_cpu_ops cortex_demeter, CORTEX_DEMETER_MIDR, \ |
| 76 | cortex_demeter_reset_func, \ |
| 77 | cortex_demeter_core_pwr_dwn |