projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e81c782c SH |
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 | ||
| 16 | int __weak acpi_ffh_address_space_arch_setup(void *handler_ctxt, | |
| 17 | void **region_ctxt) | |
| 18 | { | |
| 19 | return -EOPNOTSUPP; | |
| 20 | } | |
| 21 | ||
| 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 | |
| 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 | |
| 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 | ||
| 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 | } |