1*e81c782cSSudeep Holla // SPDX-License-Identifier: GPL-2.0-only
2*e81c782cSSudeep Holla /*
3*e81c782cSSudeep Holla * Author: Sudeep Holla <sudeep.holla@arm.com>
4*e81c782cSSudeep Holla * Copyright 2022 Arm Limited
5*e81c782cSSudeep Holla */
6*e81c782cSSudeep Holla #include <linux/kernel.h>
7*e81c782cSSudeep Holla #include <linux/acpi.h>
8*e81c782cSSudeep Holla #include <linux/completion.h>
9*e81c782cSSudeep Holla #include <linux/idr.h>
10*e81c782cSSudeep Holla #include <linux/io.h>
11*e81c782cSSudeep Holla
12*e81c782cSSudeep Holla static struct acpi_ffh_info ffh_ctx;
13*e81c782cSSudeep Holla
acpi_ffh_address_space_arch_setup(void * handler_ctxt,void ** region_ctxt)14*e81c782cSSudeep Holla int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt,
15*e81c782cSSudeep Holla void **region_ctxt)
16*e81c782cSSudeep Holla {
17*e81c782cSSudeep Holla return -EOPNOTSUPP;
18*e81c782cSSudeep Holla }
19*e81c782cSSudeep Holla
acpi_ffh_address_space_arch_handler(acpi_integer * value,void * region_context)20*e81c782cSSudeep Holla int __weak acpi_ffh_address_space_arch_handler(acpi_integer *value,
21*e81c782cSSudeep Holla void *region_context)
22*e81c782cSSudeep Holla {
23*e81c782cSSudeep Holla return -EOPNOTSUPP;
24*e81c782cSSudeep Holla }
25*e81c782cSSudeep Holla
26*e81c782cSSudeep Holla static acpi_status
acpi_ffh_address_space_setup(acpi_handle region_handle,u32 function,void * handler_context,void ** region_context)27*e81c782cSSudeep Holla acpi_ffh_address_space_setup(acpi_handle region_handle, u32 function,
28*e81c782cSSudeep Holla void *handler_context, void **region_context)
29*e81c782cSSudeep Holla {
30*e81c782cSSudeep Holla return acpi_ffh_address_space_arch_setup(handler_context,
31*e81c782cSSudeep Holla region_context);
32*e81c782cSSudeep Holla }
33*e81c782cSSudeep Holla
34*e81c782cSSudeep Holla 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*e81c782cSSudeep Holla acpi_ffh_address_space_handler(u32 function, acpi_physical_address addr,
36*e81c782cSSudeep Holla u32 bits, acpi_integer *value,
37*e81c782cSSudeep Holla void *handler_context, void *region_context)
38*e81c782cSSudeep Holla {
39*e81c782cSSudeep Holla return acpi_ffh_address_space_arch_handler(value, region_context);
40*e81c782cSSudeep Holla }
41*e81c782cSSudeep Holla
acpi_init_ffh(void)42*e81c782cSSudeep Holla void __init acpi_init_ffh(void)
43*e81c782cSSudeep Holla {
44*e81c782cSSudeep Holla acpi_status status;
45*e81c782cSSudeep Holla
46*e81c782cSSudeep Holla status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
47*e81c782cSSudeep Holla ACPI_ADR_SPACE_FIXED_HARDWARE,
48*e81c782cSSudeep Holla &acpi_ffh_address_space_handler,
49*e81c782cSSudeep Holla &acpi_ffh_address_space_setup,
50*e81c782cSSudeep Holla &ffh_ctx);
51*e81c782cSSudeep Holla if (ACPI_FAILURE(status))
52*e81c782cSSudeep Holla pr_alert("OperationRegion handler could not be installed\n");
53*e81c782cSSudeep Holla }
54