forked from mirrors/linux
c163f90cc8
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
395 lines
12 KiB
C
395 lines
12 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 - 2019, 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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/*
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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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#define PCC_MASTER_SUBSPACE 3
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/*
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* The following macros determine a given offset is a COMD field.
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* According to the specification, generic subspaces (types 0-2) contains a
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* 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte
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* COMD field starting at offset 12.
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*/
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#define GENERIC_SUBSPACE_COMMAND(a) (4 == a || a == 5)
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#define MASTER_SUBSPACE_COMMAND(a) (12 <= a && a <= 15)
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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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} 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_PLATFORM_COMM)) {
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/*
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* Reading from a PCC field unit does not require the handler because
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* it only requires reading from the internal_pcc_buffer.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"PCC FieldRead bits %u\n",
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obj_desc->field.bit_length));
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memcpy(buffer,
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obj_desc->field.region_obj->field.internal_pcc_buffer +
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obj_desc->field.base_byte_offset,
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(acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.
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bit_length));
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*ret_buffer_desc = buffer_desc;
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return AE_OK;
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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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u32 data_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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} 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_PLATFORM_COMM)) {
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/*
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* According to the spec a write to the COMD field will invoke the
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* region handler. Otherwise, write to the pcc_internal buffer. This
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* implementation will use the offsets specified rather than the name
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* of the field. This is considered safer because some firmware tools
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* are known to obfiscate named objects.
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*/
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data_length =
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(acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.
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bit_length);
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memcpy(obj_desc->field.region_obj->field.internal_pcc_buffer +
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obj_desc->field.base_byte_offset,
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source_desc->buffer.pointer, data_length);
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if ((obj_desc->field.region_obj->region.address ==
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PCC_MASTER_SUBSPACE
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&& MASTER_SUBSPACE_COMMAND(obj_desc->field.
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base_byte_offset))
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|| GENERIC_SUBSPACE_COMMAND(obj_desc->field.
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base_byte_offset)) {
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/* Perform the write */
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ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
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"PCC COMD field has been written. Invoking PCC handler now.\n"));
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status =
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acpi_ex_access_region(obj_desc, 0,
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(u64 *)obj_desc->field.
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region_obj->field.
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internal_pcc_buffer,
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ACPI_WRITE);
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return_ACPI_STATUS(status);
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}
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return (AE_OK);
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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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