mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 10:24:15 +07:00
e324e10109
Mostly for access to Generic Serial Bus, but also cleanup for the other fields. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
691 lines
20 KiB
C
691 lines
20 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exfield - AML execution - field_unit read/write
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acdispat.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exfield")
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/* Local prototypes */
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static acpi_status
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acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
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union acpi_operand_object **return_buffer);
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static acpi_status
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acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **return_buffer);
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static acpi_status
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acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer);
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static acpi_status
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acpi_ex_write_gpio(union acpi_operand_object *source_desc,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **return_buffer);
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/*
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* This table maps the various Attrib protocols to the byte transfer
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* length. Used for the generic serial bus.
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*/
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#define ACPI_INVALID_PROTOCOL_ID 0x80
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#define ACPI_MAX_PROTOCOL_ID 0x0F
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const u8 acpi_protocol_lengths[] = {
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ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */
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ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */
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0x00, /* 2 - ATTRIB_QUICK */
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ACPI_INVALID_PROTOCOL_ID, /* 3 - reserved */
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0x01, /* 4 - ATTRIB_SEND_RECEIVE */
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ACPI_INVALID_PROTOCOL_ID, /* 5 - reserved */
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0x01, /* 6 - ATTRIB_BYTE */
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ACPI_INVALID_PROTOCOL_ID, /* 7 - reserved */
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0x02, /* 8 - ATTRIB_WORD */
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ACPI_INVALID_PROTOCOL_ID, /* 9 - reserved */
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0xFF, /* A - ATTRIB_BLOCK */
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0xFF, /* B - ATTRIB_BYTES */
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0x02, /* C - ATTRIB_PROCESS_CALL */
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0xFF, /* D - ATTRIB_BLOCK_PROCESS_CALL */
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0xFF, /* E - ATTRIB_RAW_BYTES */
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0xFF /* F - ATTRIB_RAW_PROCESS_BYTES */
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};
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_get_protocol_buffer_length
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*
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* PARAMETERS: protocol_id - The type of the protocol indicated by region
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* field access attributes
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* return_length - Where the protocol byte transfer length is
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* returned
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*
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* RETURN: Status and decoded byte transfer length
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*
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* DESCRIPTION: This routine returns the length of the generic_serial_bus
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* protocol bytes
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*
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******************************************************************************/
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acpi_status
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acpi_ex_get_protocol_buffer_length(u32 protocol_id, u32 *return_length)
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{
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if ((protocol_id > ACPI_MAX_PROTOCOL_ID) ||
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(acpi_protocol_lengths[protocol_id] == ACPI_INVALID_PROTOCOL_ID)) {
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ACPI_ERROR((AE_INFO,
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"Invalid Field/AccessAs protocol ID: 0x%4.4X",
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protocol_id));
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return (AE_AML_PROTOCOL);
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}
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*return_length = acpi_protocol_lengths[protocol_id];
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_read_data_from_field
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*
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* PARAMETERS: walk_state - Current execution state
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* obj_desc - The named field
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* ret_buffer_desc - Where the return data object is stored
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from a named field. Returns either an Integer or a
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* Buffer, depending on the size of the field.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **ret_buffer_desc)
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{
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acpi_status status;
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union acpi_operand_object *buffer_desc;
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void *buffer;
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u32 buffer_length;
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ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
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/* Parameter validation */
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if (!obj_desc) {
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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if (!ret_buffer_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
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/*
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* If the buffer_field arguments have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
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status = acpi_ds_get_buffer_field_arguments(obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
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(obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_SMBUS
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|| obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_GSBUS
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|| obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_IPMI)) {
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/* SMBus, GSBus, IPMI serial */
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status = acpi_ex_read_serial_bus(obj_desc, ret_buffer_desc);
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return_ACPI_STATUS(status);
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}
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/*
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* Allocate a buffer for the contents of the field.
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*
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* If the field is larger than the current integer width, create
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* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
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* the use of arithmetic operators on the returned value if the
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* field size is equal or smaller than an Integer.
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*
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* Note: Field.length is in bits.
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*/
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buffer_length =
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(acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
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if (buffer_length > acpi_gbl_integer_byte_width) {
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/* Field is too large for an Integer, create a Buffer instead */
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buffer_desc = acpi_ut_create_buffer_object(buffer_length);
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if (!buffer_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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buffer = buffer_desc->buffer.pointer;
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} else {
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/* Field will fit within an Integer (normal case) */
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buffer_desc = acpi_ut_create_integer_object((u64) 0);
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if (!buffer_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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buffer_length = acpi_gbl_integer_byte_width;
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buffer = &buffer_desc->integer.value;
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}
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if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
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(obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_GPIO)) {
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/* General Purpose I/O */
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status = acpi_ex_read_gpio(obj_desc, buffer);
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goto exit;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
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obj_desc, obj_desc->common.type, buffer,
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buffer_length));
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
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obj_desc->common_field.bit_length,
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obj_desc->common_field.start_field_bit_offset,
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obj_desc->common_field.base_byte_offset));
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/* Lock entire transaction if requested */
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Read from the field */
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status = acpi_ex_extract_from_field(obj_desc, buffer, buffer_length);
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acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
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exit:
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if (ACPI_FAILURE(status)) {
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acpi_ut_remove_reference(buffer_desc);
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} else {
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*ret_buffer_desc = buffer_desc;
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_write_data_to_field
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*
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* PARAMETERS: source_desc - Contains data to write
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* obj_desc - The named field
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* result_desc - Where the return value is returned, if any
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to a named field
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*
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******************************************************************************/
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acpi_status
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acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **result_desc)
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{
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acpi_status status;
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u32 buffer_length;
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void *buffer;
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ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
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/* Parameter validation */
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if (!source_desc || !obj_desc) {
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return_ACPI_STATUS(AE_AML_NO_OPERAND);
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}
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if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
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/*
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* If the buffer_field arguments have not been previously evaluated,
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* evaluate them now and save the results.
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*/
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if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
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status = acpi_ds_get_buffer_field_arguments(obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
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(obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_GPIO)) {
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/* General Purpose I/O */
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status = acpi_ex_write_gpio(source_desc, obj_desc, result_desc);
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return_ACPI_STATUS(status);
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} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
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(obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_SMBUS
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|| obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_GSBUS
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|| obj_desc->field.region_obj->region.space_id ==
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ACPI_ADR_SPACE_IPMI)) {
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/* SMBus, GSBus, IPMI serial */
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status =
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acpi_ex_write_serial_bus(source_desc, obj_desc,
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result_desc);
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return_ACPI_STATUS(status);
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}
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/* Get a pointer to the data to be written */
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switch (source_desc->common.type) {
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case ACPI_TYPE_INTEGER:
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buffer = &source_desc->integer.value;
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buffer_length = sizeof(source_desc->integer.value);
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break;
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case ACPI_TYPE_BUFFER:
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buffer = source_desc->buffer.pointer;
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buffer_length = source_desc->buffer.length;
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break;
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case ACPI_TYPE_STRING:
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buffer = source_desc->string.pointer;
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buffer_length = source_desc->string.length;
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break;
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default:
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
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source_desc,
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acpi_ut_get_type_name(source_desc->common.type),
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source_desc->common.type, buffer, buffer_length));
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
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obj_desc,
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acpi_ut_get_type_name(obj_desc->common.type),
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obj_desc->common.type,
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obj_desc->common_field.bit_length,
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obj_desc->common_field.start_field_bit_offset,
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obj_desc->common_field.base_byte_offset));
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/* Lock entire transaction if requested */
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Write to the field */
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status = acpi_ex_insert_into_field(obj_desc, buffer, buffer_length);
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acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_read_gpio
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*
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* PARAMETERS: obj_desc - The named field to read
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* buffer - Where the return data is returnd
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from a named field that references a Generic Serial Bus
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* field
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc);
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/*
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* For GPIO (general_purpose_io), the Address will be the bit offset
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* from the previous Connection() operator, making it effectively a
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* pin number index. The bit_length is the length of the field, which
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* is thus the number of pins.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"GPIO FieldRead [FROM]: Pin %u Bits %u\n",
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obj_desc->field.pin_number_index,
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obj_desc->field.bit_length));
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/* Lock entire transaction if requested */
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Perform the read */
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status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ);
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acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_write_gpio
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*
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* PARAMETERS: source_desc - Contains data to write. Expect to be
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* an Integer object.
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* obj_desc - The named field
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* result_desc - Where the return value is returned, if any
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to a named field that references a General Purpose I/O
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* field.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_write_gpio(union acpi_operand_object *source_desc,
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union acpi_operand_object *obj_desc,
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union acpi_operand_object **return_buffer)
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{
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acpi_status status;
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void *buffer;
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ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc);
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/*
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* For GPIO (general_purpose_io), we will bypass the entire field
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* mechanism and handoff the bit address and bit width directly to
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* the handler. The Address will be the bit offset
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* from the previous Connection() operator, making it effectively a
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* pin number index. The bit_length is the length of the field, which
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* is thus the number of pins.
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*/
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if (source_desc->common.type != ACPI_TYPE_INTEGER) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n",
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acpi_ut_get_type_name(source_desc->common.type),
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source_desc->common.type,
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(u32)source_desc->integer.value,
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obj_desc->field.pin_number_index,
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obj_desc->field.bit_length));
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buffer = &source_desc->integer.value;
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/* Lock entire transaction if requested */
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Perform the write */
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status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE);
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acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_read_serial_bus
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*
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* PARAMETERS: obj_desc - The named field to read
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* return_buffer - Where the return value is returned, if any
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from a named field that references a serial bus
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* (SMBus, IPMI, or GSBus).
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
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union acpi_operand_object **return_buffer)
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{
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acpi_status status;
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u32 buffer_length;
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union acpi_operand_object *buffer_desc;
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u32 function;
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u16 accessor_type;
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ACPI_FUNCTION_TRACE_PTR(ex_read_serial_bus, obj_desc);
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/*
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* This is an SMBus, GSBus or IPMI read. We must create a buffer to
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* hold the data and then directly access the region handler.
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*
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* Note: SMBus and GSBus protocol value is passed in upper 16-bits
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* of Function
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*
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* Common buffer format:
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* Status; (Byte 0 of the data buffer)
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* Length; (Byte 1 of the data buffer)
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* Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
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*/
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switch (obj_desc->field.region_obj->region.space_id) {
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case ACPI_ADR_SPACE_SMBUS:
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buffer_length = ACPI_SMBUS_BUFFER_SIZE;
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function = ACPI_READ | (obj_desc->field.attribute << 16);
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break;
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case ACPI_ADR_SPACE_IPMI:
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buffer_length = ACPI_IPMI_BUFFER_SIZE;
|
|
function = ACPI_READ;
|
|
break;
|
|
|
|
case ACPI_ADR_SPACE_GSBUS:
|
|
|
|
accessor_type = obj_desc->field.attribute;
|
|
if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"Invalid direct read using bidirectional write-then-read protocol"));
|
|
|
|
return_ACPI_STATUS(AE_AML_PROTOCOL);
|
|
}
|
|
|
|
status =
|
|
acpi_ex_get_protocol_buffer_length(accessor_type,
|
|
&buffer_length);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"Invalid protocol ID for GSBus: 0x%4.4X",
|
|
accessor_type));
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/* Add header length to get the full size of the buffer */
|
|
|
|
buffer_length += ACPI_SERIAL_HEADER_SIZE;
|
|
function = ACPI_READ | (accessor_type << 16);
|
|
break;
|
|
|
|
default:
|
|
return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
|
|
}
|
|
|
|
/* Create the local transfer buffer that is returned to the caller */
|
|
|
|
buffer_desc = acpi_ut_create_buffer_object(buffer_length);
|
|
if (!buffer_desc) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Lock entire transaction if requested */
|
|
|
|
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
|
|
|
|
/* Call the region handler for the write-then-read */
|
|
|
|
status = acpi_ex_access_region(obj_desc, 0,
|
|
ACPI_CAST_PTR(u64,
|
|
buffer_desc->buffer.
|
|
pointer), function);
|
|
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
|
|
|
|
*return_buffer = buffer_desc;
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_write_serial_bus
|
|
*
|
|
* PARAMETERS: source_desc - Contains data to write
|
|
* obj_desc - The named field
|
|
* return_buffer - Where the return value is returned, if any
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Write to a named field that references a serial bus
|
|
* (SMBus, IPMI, GSBus).
|
|
*
|
|
******************************************************************************/
|
|
|
|
static acpi_status
|
|
acpi_ex_write_serial_bus(union acpi_operand_object *source_desc,
|
|
union acpi_operand_object *obj_desc,
|
|
union acpi_operand_object **return_buffer)
|
|
{
|
|
acpi_status status;
|
|
u32 buffer_length;
|
|
u32 data_length;
|
|
void *buffer;
|
|
union acpi_operand_object *buffer_desc;
|
|
u32 function;
|
|
u16 accessor_type;
|
|
|
|
ACPI_FUNCTION_TRACE_PTR(ex_write_serial_bus, obj_desc);
|
|
|
|
/*
|
|
* This is an SMBus, GSBus or IPMI write. We will bypass the entire
|
|
* field mechanism and handoff the buffer directly to the handler.
|
|
* For these address spaces, the buffer is bidirectional; on a
|
|
* write, return data is returned in the same buffer.
|
|
*
|
|
* Source must be a buffer of sufficient size, these are fixed size:
|
|
* ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
|
|
*
|
|
* Note: SMBus and GSBus protocol type is passed in upper 16-bits
|
|
* of Function
|
|
*
|
|
* Common buffer format:
|
|
* Status; (Byte 0 of the data buffer)
|
|
* Length; (Byte 1 of the data buffer)
|
|
* Data[x-1]: (Bytes 2-x of the arbitrary length data buffer)
|
|
*/
|
|
if (source_desc->common.type != ACPI_TYPE_BUFFER) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"SMBus/IPMI/GenericSerialBus write requires "
|
|
"Buffer, found type %s",
|
|
acpi_ut_get_object_type_name(source_desc)));
|
|
|
|
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
|
|
}
|
|
|
|
switch (obj_desc->field.region_obj->region.space_id) {
|
|
case ACPI_ADR_SPACE_SMBUS:
|
|
|
|
buffer_length = ACPI_SMBUS_BUFFER_SIZE;
|
|
data_length = ACPI_SMBUS_DATA_SIZE;
|
|
function = ACPI_WRITE | (obj_desc->field.attribute << 16);
|
|
break;
|
|
|
|
case ACPI_ADR_SPACE_IPMI:
|
|
|
|
buffer_length = ACPI_IPMI_BUFFER_SIZE;
|
|
data_length = ACPI_IPMI_DATA_SIZE;
|
|
function = ACPI_WRITE;
|
|
break;
|
|
|
|
case ACPI_ADR_SPACE_GSBUS:
|
|
|
|
accessor_type = obj_desc->field.attribute;
|
|
status =
|
|
acpi_ex_get_protocol_buffer_length(accessor_type,
|
|
&buffer_length);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"Invalid protocol ID for GSBus: 0x%4.4X",
|
|
accessor_type));
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/* Add header length to get the full size of the buffer */
|
|
|
|
buffer_length += ACPI_SERIAL_HEADER_SIZE;
|
|
data_length = source_desc->buffer.pointer[1];
|
|
function = ACPI_WRITE | (accessor_type << 16);
|
|
break;
|
|
|
|
default:
|
|
return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
|
|
}
|
|
|
|
#if 0
|
|
OBSOLETE ?
|
|
/* Check for possible buffer overflow */
|
|
if (data_length > source_desc->buffer.length) {
|
|
ACPI_ERROR((AE_INFO,
|
|
"Length in buffer header (%u)(%u) is greater than "
|
|
"the physical buffer length (%u) and will overflow",
|
|
data_length, buffer_length,
|
|
source_desc->buffer.length));
|
|
|
|
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
|
|
}
|
|
#endif
|
|
|
|
/* Create the transfer/bidirectional/return buffer */
|
|
|
|
buffer_desc = acpi_ut_create_buffer_object(buffer_length);
|
|
if (!buffer_desc) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Copy the input buffer data to the transfer buffer */
|
|
|
|
buffer = buffer_desc->buffer.pointer;
|
|
memcpy(buffer, source_desc->buffer.pointer, data_length);
|
|
|
|
/* Lock entire transaction if requested */
|
|
|
|
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
|
|
|
|
/*
|
|
* Perform the write (returns status and perhaps data in the
|
|
* same buffer)
|
|
*/
|
|
status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, function);
|
|
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
|
|
|
|
*return_buffer = buffer_desc;
|
|
return_ACPI_STATUS(status);
|
|
}
|