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#include <linux/arm-smccc.h>
13
14static struct acpi_ffh_info ffh_ctx;
15
16int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt,
17					     void **region_ctxt)
18{
19	return -EOPNOTSUPP;
20}
21
22int __weak acpi_ffh_address_space_arch_handler(acpi_integer *value,
23					       void *region_context)
24{
25	return -EOPNOTSUPP;
26}
27
28static acpi_status
29acpi_ffh_address_space_setup(acpi_handle region_handle, u32 function,
30			     void *handler_context,  void **region_context)
31{
32	return acpi_ffh_address_space_arch_setup(handler_context,
33						 region_context);
34}
35
36static acpi_status
37acpi_ffh_address_space_handler(u32 function, acpi_physical_address addr,
38			       u32 bits, acpi_integer *value,
39			       void *handler_context, void *region_context)
40{
41	return acpi_ffh_address_space_arch_handler(value, region_context);
42}
43
44void __init acpi_init_ffh(void)
45{
46	acpi_status status;
47
48	status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
49						    ACPI_ADR_SPACE_FIXED_HARDWARE,
50						    &acpi_ffh_address_space_handler,
51						    &acpi_ffh_address_space_setup,
52						    &ffh_ctx);
53	if (ACPI_FAILURE(status))
54		pr_alert("OperationRegion handler could not be installed\n");
55}