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_ctxt: handler_context, |
31 | region_ctxt: 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 | handler: &acpi_ffh_address_space_handler, |
49 | setup: &acpi_ffh_address_space_setup, |
50 | context: &ffh_ctx); |
51 | if (ACPI_FAILURE(status)) |
52 | pr_alert("OperationRegion handler could not be installed\n" ); |
53 | } |
54 | |