| /* |
| * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <asm_macros.S> |
| #include <assert_macros.S> |
| #include <platform_def.h> |
| #include <psci.h> |
| |
| .globl psci_do_pwrdown_cache_maintenance |
| .globl psci_do_pwrup_cache_maintenance |
| .globl psci_power_down_wfi |
| |
| /* ----------------------------------------------------------------------- |
| * void psci_do_pwrdown_cache_maintenance(unsigned int power level); |
| * |
| * This function performs cache maintenance for the specified power |
| * level. The levels of cache affected are determined by the power |
| * level which is passed as the argument i.e. level 0 results |
| * in a flush of the L1 cache. Both the L1 and L2 caches are flushed |
| * for a higher power level. |
| * |
| * Additionally, this function also ensures that stack memory is correctly |
| * flushed out to avoid coherency issues due to a change in its memory |
| * attributes after the data cache is disabled. |
| * ----------------------------------------------------------------------- |
| */ |
| func psci_do_pwrdown_cache_maintenance |
| stp x29, x30, [sp,#-16]! |
| stp x19, x20, [sp,#-16]! |
| |
| /* --------------------------------------------- |
| * Invoke CPU-specific power down operations for |
| * the appropriate level |
| * --------------------------------------------- |
| */ |
| bl prepare_cpu_pwr_dwn |
| |
| /* --------------------------------------------- |
| * Do stack maintenance by flushing the used |
| * stack to the main memory and invalidating the |
| * remainder. |
| * --------------------------------------------- |
| */ |
| bl plat_get_my_stack |
| |
| /* --------------------------------------------- |
| * Calculate and store the size of the used |
| * stack memory in x1. |
| * --------------------------------------------- |
| */ |
| mov x19, x0 |
| mov x1, sp |
| sub x1, x0, x1 |
| mov x0, sp |
| bl flush_dcache_range |
| |
| /* --------------------------------------------- |
| * Calculate and store the size of the unused |
| * stack memory in x1. Calculate and store the |
| * stack base address in x0. |
| * --------------------------------------------- |
| */ |
| sub x0, x19, #PLATFORM_STACK_SIZE |
| sub x1, sp, x0 |
| bl inv_dcache_range |
| |
| ldp x19, x20, [sp], #16 |
| ldp x29, x30, [sp], #16 |
| ret |
| endfunc psci_do_pwrdown_cache_maintenance |
| |
| |
| /* ----------------------------------------------------------------------- |
| * void psci_do_pwrup_cache_maintenance(void); |
| * |
| * This function performs cache maintenance after this cpu is powered up. |
| * Currently, this involves managing the used stack memory before turning |
| * on the data cache. |
| * ----------------------------------------------------------------------- |
| */ |
| func psci_do_pwrup_cache_maintenance |
| stp x29, x30, [sp,#-16]! |
| |
| /* --------------------------------------------- |
| * Ensure any inflight stack writes have made it |
| * to main memory. |
| * --------------------------------------------- |
| */ |
| dmb st |
| |
| /* --------------------------------------------- |
| * Calculate and store the size of the used |
| * stack memory in x1. Calculate and store the |
| * stack base address in x0. |
| * --------------------------------------------- |
| */ |
| bl plat_get_my_stack |
| mov x1, sp |
| sub x1, x0, x1 |
| mov x0, sp |
| bl inv_dcache_range |
| |
| /* --------------------------------------------- |
| * Enable the data cache. |
| * --------------------------------------------- |
| */ |
| mrs x0, sctlr_el3 |
| orr x0, x0, #SCTLR_C_BIT |
| msr sctlr_el3, x0 |
| isb |
| |
| ldp x29, x30, [sp], #16 |
| ret |
| endfunc psci_do_pwrup_cache_maintenance |
| |
| /* ----------------------------------------------------------------------- |
| * void psci_power_down_wfi(void); |
| * This function is called to indicate to the power controller that it |
| * is safe to power down this cpu. It should not exit the wfi and will |
| * be released from reset upon power up. |
| * ----------------------------------------------------------------------- |
| */ |
| func psci_power_down_wfi |
| dsb sy // ensure write buffer empty |
| wfi |
| no_ret plat_panic_handler |
| endfunc psci_power_down_wfi |