346 lines
10 KiB
C
346 lines
10 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: exserial - field_unit support for serial address spaces
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*
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* Copyright (C) 2000 - 2020, 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("exserial")
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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 returned
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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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acpi_status 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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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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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;
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function = ACPI_READ;
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break;
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case ACPI_ADR_SPACE_GSBUS:
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accessor_type = obj_desc->field.attribute;
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if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS_BYTES) {
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ACPI_ERROR((AE_INFO,
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"Invalid direct read using bidirectional write-then-read protocol"));
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return_ACPI_STATUS(AE_AML_PROTOCOL);
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}
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status =
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acpi_ex_get_protocol_buffer_length(accessor_type,
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&buffer_length);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Invalid protocol ID for GSBus: 0x%4.4X",
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accessor_type));
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return_ACPI_STATUS(status);
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}
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/* Add header length to get the full size of the buffer */
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buffer_length += ACPI_SERIAL_HEADER_SIZE;
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function = ACPI_READ | (accessor_type << 16);
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break;
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default:
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return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
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}
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/* Create the local transfer buffer that is returned to the caller */
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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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/* Lock entire transaction if requested */
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acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
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/* Call the region handler for the write-then-read */
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status = acpi_ex_access_region(obj_desc, 0,
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ACPI_CAST_PTR(u64,
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buffer_desc->buffer.
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pointer), function);
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acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
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*return_buffer = buffer_desc;
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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_serial_bus
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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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* 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: Write to a named field that references a serial bus
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* (SMBus, IPMI, GSBus).
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*
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******************************************************************************/
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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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{
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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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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_write_serial_bus, obj_desc);
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/*
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* This is an SMBus, GSBus or IPMI write. We will bypass the entire
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* field mechanism and handoff the buffer directly to the handler.
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* For these address spaces, the buffer is bidirectional; on a
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* write, return data is returned in the same buffer.
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*
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* Source must be a buffer of sufficient size, these are fixed size:
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* ACPI_SMBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
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*
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* Note: SMBus and GSBus protocol type 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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if (source_desc->common.type != ACPI_TYPE_BUFFER) {
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ACPI_ERROR((AE_INFO,
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"SMBus/IPMI/GenericSerialBus write requires "
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"Buffer, found type %s",
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acpi_ut_get_object_type_name(source_desc)));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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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_WRITE | (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;
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function = ACPI_WRITE;
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break;
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case ACPI_ADR_SPACE_GSBUS:
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accessor_type = obj_desc->field.attribute;
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status =
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acpi_ex_get_protocol_buffer_length(accessor_type,
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&buffer_length);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Invalid protocol ID for GSBus: 0x%4.4X",
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accessor_type));
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return_ACPI_STATUS(status);
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}
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/* Add header length to get the full size of the buffer */
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buffer_length += ACPI_SERIAL_HEADER_SIZE;
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function = ACPI_WRITE | (accessor_type << 16);
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break;
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default:
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return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
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}
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/* Create the transfer/bidirectional/return buffer */
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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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/* Copy the input buffer data to the transfer buffer */
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buffer = buffer_desc->buffer.pointer;
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data_length = (buffer_length < source_desc->buffer.length ?
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buffer_length : source_desc->buffer.length);
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memcpy(buffer, source_desc->buffer.pointer, data_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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/*
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* Perform the write (returns status and perhaps data in the
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* same buffer)
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*/
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status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, function);
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acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
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*return_buffer = buffer_desc;
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return_ACPI_STATUS(status);
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}
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