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
acpi_ffh_address_space_arch_setup(void * handler_ctxt,void ** region_ctxt)14 int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt,
15 void **region_ctxt)
16 {
17 return -EOPNOTSUPP;
18 }
19
acpi_ffh_address_space_arch_handler(acpi_integer * value,void * region_context)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
acpi_ffh_address_space_setup(acpi_handle region_handle,u32 function,void * handler_context,void ** region_context)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
acpi_ffh_address_space_handler(u32 function,acpi_physical_address addr,u32 bits,acpi_integer * value,void * handler_context,void * region_context)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
acpi_init_ffh(void)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