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ee64b827a9
ACPICA commit fad527b6e76babc7527c41325bfbef6bd1a1132b FFH(Fixed Function Hardware) Opregion is approved to be added in ACPI 6.5 via code first approach [1]. It requires special context data similar to GPIO and Generic Serial Bus as it needs to know platform specific offset and length. Add support for the special context data needed by FFH Opregion. FFH op_region enables advanced use of FFH on some architectures. For example, it could be used to easily proxy AML code to architecture-specific behavior (to ensure it is OS initiated) Actual behavior of FFH is ofcourse architecture specific and depends on the FFH bindings. The offset and length could have arch specific meaning or usage. Link: https://bugzilla.tianocore.org/show_bug.cgi?id=3598 # [1] Link: https://github.com/acpica/acpica/commit/fad527b6 Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
363 lines
10 KiB
C
363 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 - 2022, 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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case ACPI_ADR_SPACE_PLATFORM_RT:
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buffer_length = ACPI_PRM_INPUT_BUFFER_SIZE;
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function = ACPI_READ;
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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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case ACPI_ADR_SPACE_PLATFORM_RT:
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buffer_length = ACPI_PRM_INPUT_BUFFER_SIZE;
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function = ACPI_WRITE;
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break;
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case ACPI_ADR_SPACE_FIXED_HARDWARE:
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buffer_length = ACPI_FFH_INPUT_BUFFER_SIZE;
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function = ACPI_WRITE;
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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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