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
14 static struct acpi_ffh_info ffh_ctx;
15
acpi_ffh_address_space_arch_setup(void * handler_ctxt,void ** region_ctxt)16 int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt,
17 void **region_ctxt)
18 {
19 return -EOPNOTSUPP;
20 }
21
acpi_ffh_address_space_arch_handler(acpi_integer * value,void * region_context)22 int __weak acpi_ffh_address_space_arch_handler(acpi_integer *value,
23 void *region_context)
24 {
25 return -EOPNOTSUPP;
26 }
27
28 static acpi_status
acpi_ffh_address_space_setup(acpi_handle region_handle,u32 function,void * handler_context,void ** region_context)29 acpi_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
36 static acpi_status
acpi_ffh_address_space_handler(u32 function,acpi_physical_address addr,u32 bits,acpi_integer * value,void * handler_context,void * region_context)37 acpi_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
acpi_init_ffh(void)44 void __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 }
56