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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Author: Sudeep Holla <sudeep.holla@arm.com>4 * Copyright 2022 Arm Limited5 */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_status27acpi_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_status35acpi_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