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 12 static struct acpi_ffh_info ffh_ctx; 13 14 int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt, 15 void **region_ctxt) 16 { 17 return -EOPNOTSUPP; 18 } 19 20 int __weak acpi_ffh_address_space_arch_handler(acpi_integer *value, 21 void *region_context) 22 { 23 return -EOPNOTSUPP; 24 } 25 26 static acpi_status 27 acpi_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 34 static acpi_status 35 acpi_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 42 void __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