1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Author: Sudeep Holla <sudeep.holla@arm.com> 4 * Copyright 2022 Arm Limited 5 */ 6#include <linux/kernel.h> 7#include <linux/acpi.h> 8#include <linux/completion.h> 9#include <linux/idr.h> 10#include <linux/io.h> 11 12static struct acpi_ffh_info ffh_ctx; 13 14int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt, 15 void **region_ctxt) 16{ 17 return -EOPNOTSUPP; 18} 19 20int __weak acpi_ffh_address_space_arch_handler(acpi_integer *value, 21 void *region_context) 22{ 23 return -EOPNOTSUPP; 24} 25 26static acpi_status 27acpi_ffh_address_space_setup(acpi_handle region_handle, u32 function, 28 void *handler_context, void **region_context) 29{ 30 return acpi_ffh_address_space_arch_setup(handler_context, 31 region_context); 32} 33 34static acpi_status 35acpi_ffh_address_space_handler(u32 function, acpi_physical_address addr, 36 u32 bits, acpi_integer *value, 37 void *handler_context, void *region_context) 38{ 39 return acpi_ffh_address_space_arch_handler(value, region_context); 40} 41 42void __init acpi_init_ffh(void) 43{ 44 acpi_status status; 45 46 status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, 47 ACPI_ADR_SPACE_FIXED_HARDWARE, 48 &acpi_ffh_address_space_handler, 49 &acpi_ffh_address_space_setup, 50 &ffh_ctx); 51 if (ACPI_FAILURE(status)) 52 pr_alert("OperationRegion handler could not be installed\n"); 53} 54