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ACPICA: Update for field unit access

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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>
This commit is contained in:
Bob Moore 2018-10-03 11:45:36 -07:00 committed by Rafael J. Wysocki
parent f8553720e1
commit e324e10109
3 changed files with 449 additions and 286 deletions
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3
drivers/acpi/acpica/acinterp.h
View File

@ -123,6 +123,9 @@ acpi_ex_trace_point(acpi_trace_event_type type,
/*
* exfield - ACPI AML (p-code) execution - field manipulation
*/
acpi_status
acpi_ex_get_protocol_buffer_length(u32 protocol_id, u32 *return_length);
acpi_status
acpi_ex_common_buffer_setup(union acpi_operand_object *obj_desc,
u32 buffer_length, u32 * datum_count);

714
drivers/acpi/acpica/exfield.c
View File

@ -1,7 +1,7 @@
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
* Module Name: exfield - AML execution - field_unit read/write
*
* Copyright (C) 2000 - 2018, Intel Corp.
*
@ -17,71 +17,80 @@
ACPI_MODULE_NAME("exfield")
/* Local prototypes */
static u32
acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length);
static acpi_status
acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
union acpi_operand_object **return_buffer);
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);
static acpi_status
acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer);
static acpi_status
acpi_ex_write_gpio(union acpi_operand_object *source_desc,
union acpi_operand_object *obj_desc,
union acpi_operand_object **return_buffer);
/*
* This table maps the various Attrib protocols to the byte transfer
* length. Used for the generic serial bus.
*/
#define ACPI_INVALID_PROTOCOL_ID 0x80
#define ACPI_MAX_PROTOCOL_ID 0x0F
const u8 acpi_protocol_lengths[] = {
ACPI_INVALID_PROTOCOL_ID, /* 0 - reserved */
ACPI_INVALID_PROTOCOL_ID, /* 1 - reserved */
0x00, /* 2 - ATTRIB_QUICK */
ACPI_INVALID_PROTOCOL_ID, /* 3 - reserved */
0x01, /* 4 - ATTRIB_SEND_RECEIVE */
ACPI_INVALID_PROTOCOL_ID, /* 5 - reserved */
0x01, /* 6 - ATTRIB_BYTE */
ACPI_INVALID_PROTOCOL_ID, /* 7 - reserved */
0x02, /* 8 - ATTRIB_WORD */
ACPI_INVALID_PROTOCOL_ID, /* 9 - reserved */
0xFF, /* A - ATTRIB_BLOCK */
0xFF, /* B - ATTRIB_BYTES */
0x02, /* C - ATTRIB_PROCESS_CALL */
0xFF, /* D - ATTRIB_BLOCK_PROCESS_CALL */
0xFF, /* E - ATTRIB_RAW_BYTES */
0xFF /* F - ATTRIB_RAW_PROCESS_BYTES */
};
/*******************************************************************************
*
* FUNCTION: acpi_ex_get_serial_access_length
* FUNCTION: acpi_ex_get_protocol_buffer_length
*
* PARAMETERS: accessor_type - The type of the protocol indicated by region
* PARAMETERS: protocol_id - The type of the protocol indicated by region
* field access attributes
* access_length - The access length of the region field
* return_length - Where the protocol byte transfer length is
* returned
*
* RETURN: Decoded access length
* RETURN: Status and decoded byte transfer length
*
* DESCRIPTION: This routine returns the length of the generic_serial_bus
* protocol bytes
*
******************************************************************************/
static u32
acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length)
acpi_status
acpi_ex_get_protocol_buffer_length(u32 protocol_id, u32 *return_length)
{
u32 length;
switch (accessor_type) {
case AML_FIELD_ATTRIB_QUICK:
if ((protocol_id > ACPI_MAX_PROTOCOL_ID) ||
(acpi_protocol_lengths[protocol_id] == ACPI_INVALID_PROTOCOL_ID)) {
ACPI_ERROR((AE_INFO,
"Invalid Field/AccessAs protocol ID: 0x%4.4X",
protocol_id));
length = 0;
break;
case AML_FIELD_ATTRIB_SEND_RCV:
case AML_FIELD_ATTRIB_BYTE:
length = 1;
break;
case AML_FIELD_ATTRIB_WORD:
case AML_FIELD_ATTRIB_WORD_CALL:
length = 2;
break;
case AML_FIELD_ATTRIB_MULTIBYTE:
case AML_FIELD_ATTRIB_RAW_BYTES:
length = access_length;
break;
case AML_FIELD_ATTRIB_RAW_PROCESS:
/*
* Worst case bidirectional buffer size. This ignores the
* access_length argument to access_as because it is not needed.
* August 2018.
*/
length = ACPI_MAX_GSBUS_BUFFER_SIZE;
break;
case AML_FIELD_ATTRIB_BLOCK:
case AML_FIELD_ATTRIB_BLOCK_CALL:
default:
length = ACPI_GSBUS_BUFFER_SIZE - 2;
break;
return (AE_AML_PROTOCOL);
}
return (length);
*return_length = acpi_protocol_lengths[protocol_id];
return (AE_OK);
}
/*******************************************************************************
@ -106,10 +115,8 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
{
acpi_status status;
union acpi_operand_object *buffer_desc;
acpi_size length;
void *buffer;
u32 function;
u16 accessor_type;
u32 buffer_length;
ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
@ -140,67 +147,11 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
ACPI_ADR_SPACE_GSBUS
|| obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_IPMI)) {
/*
* This is an SMBus, GSBus or IPMI read. We must create a buffer to
* hold the data and then directly access the region handler.
*
* Note: SMBus and GSBus protocol value is passed in upper 16-bits
* of Function
*/
if (obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_SMBUS) {
length = ACPI_SMBUS_BUFFER_SIZE;
function =
ACPI_READ | (obj_desc->field.attribute << 16);
} else if (obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_GSBUS) {
accessor_type = obj_desc->field.attribute;
if (accessor_type == AML_FIELD_ATTRIB_RAW_PROCESS) {
ACPI_ERROR((AE_INFO,
"Invalid direct read using bidirectional write-then-read protocol"));
return_ACPI_STATUS(AE_AML_PROTOCOL);
}
/* SMBus, GSBus, IPMI serial */
length =
acpi_ex_get_serial_access_length(accessor_type,
obj_desc->field.
access_length);
/*
* Add additional 2 bytes for the generic_serial_bus data buffer:
*
* 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)
*/
length += 2;
function = ACPI_READ | (accessor_type << 16);
} else { /* IPMI */
length = ACPI_IPMI_BUFFER_SIZE;
function = ACPI_READ;
}
buffer_desc = acpi_ut_create_buffer_object(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 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);
goto exit;
status = acpi_ex_read_serial_bus(obj_desc, ret_buffer_desc);
return_ACPI_STATUS(status);
}
/*
@ -213,14 +164,14 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
*
* Note: Field.length is in bits.
*/
length =
buffer_length =
(acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
if (length > acpi_gbl_integer_byte_width) {
if (buffer_length > acpi_gbl_integer_byte_width) {
/* Field is too large for an Integer, create a Buffer instead */
buffer_desc = acpi_ut_create_buffer_object(length);
buffer_desc = acpi_ut_create_buffer_object(buffer_length);
if (!buffer_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
@ -233,47 +184,24 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
return_ACPI_STATUS(AE_NO_MEMORY);
}
length = acpi_gbl_integer_byte_width;
buffer_length = acpi_gbl_integer_byte_width;
buffer = &buffer_desc->integer.value;
}
if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_GPIO)) {
/*
* For GPIO (general_purpose_io), the Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The bit_length is the length of the field, which
* is thus the number of pins.
*/
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"GPIO FieldRead [FROM]: Pin %u Bits %u\n",
obj_desc->field.pin_number_index,
obj_desc->field.bit_length));
/* Lock entire transaction if requested */
/* General Purpose I/O */
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Perform the write */
status =
acpi_ex_access_region(obj_desc, 0, (u64 *)buffer,
ACPI_READ);
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(buffer_desc);
} else {
*ret_buffer_desc = buffer_desc;
}
return_ACPI_STATUS(status);
status = acpi_ex_read_gpio(obj_desc, buffer);
goto exit;
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
obj_desc, obj_desc->common.type, buffer,
(u32) length));
buffer_length));
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
obj_desc->common_field.bit_length,
@ -286,7 +214,7 @@ acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
/* Read from the field */
status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
status = acpi_ex_extract_from_field(obj_desc, buffer, buffer_length);
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
exit:
@ -319,12 +247,8 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
union acpi_operand_object **result_desc)
{
acpi_status status;
u32 length;
u32 data_length;
u32 buffer_length;
void *buffer;
union acpi_operand_object *buffer_desc;
u32 function;
u16 accessor_type;
ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
@ -345,6 +269,14 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
return_ACPI_STATUS(status);
}
}
} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_GPIO)) {
/* General Purpose I/O */
status = acpi_ex_write_gpio(source_desc, obj_desc, result_desc);
return_ACPI_STATUS(status);
} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_SMBUS
@ -352,135 +284,12 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
ACPI_ADR_SPACE_GSBUS
|| obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_IPMI)) {
/*
* 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 bi-directional; on a
* write, return data is returned in the same buffer.
*
* Source must be a buffer of sufficient size:
* ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or
* ACPI_IPMI_BUFFER_SIZE.
*
* Note: SMBus and GSBus protocol type is passed in upper 16-bits
* of Function
*/
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);
}
if (obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_SMBUS) {
length = ACPI_SMBUS_BUFFER_SIZE;
data_length = length;
function =
ACPI_WRITE | (obj_desc->field.attribute << 16);
} else if (obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_GSBUS) {
accessor_type = obj_desc->field.attribute;
length =
acpi_ex_get_serial_access_length(accessor_type,
obj_desc->field.
access_length);
/*
* Buffer format for Generic Serial Bus protocols:
* 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)
*/
data_length = source_desc->buffer.pointer[1]; /* Data length is 2nd byte */
if (!data_length) {
ACPI_ERROR((AE_INFO,
"Invalid zero data length in transfer buffer"));
return_ACPI_STATUS(AE_AML_BUFFER_LENGTH);
}
function = ACPI_WRITE | (accessor_type << 16);
} else { /* IPMI */
length = ACPI_IPMI_BUFFER_SIZE;
data_length = length;
function = ACPI_WRITE;
}
if (source_desc->buffer.length < data_length) {
ACPI_ERROR((AE_INFO,
"SMBus/IPMI/GenericSerialBus write requires "
"Buffer data length %u, found buffer length %u",
data_length, source_desc->buffer.length));
return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
}
/* Create the transfer/bidirectional buffer */
buffer_desc = acpi_ut_create_buffer_object(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);
*result_desc = buffer_desc;
return_ACPI_STATUS(status);
} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
(obj_desc->field.region_obj->region.space_id ==
ACPI_ADR_SPACE_GPIO)) {
/*
* For GPIO (general_purpose_io), we will bypass the entire field
* mechanism and handoff the bit address and bit width directly to
* the handler. The Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The bit_length is the length of the field, which
* is thus the number of pins.
*/
if (source_desc->common.type != ACPI_TYPE_INTEGER) {
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"GPIO FieldWrite [FROM]: (%s:%X), Val %.8X [TO]: Pin %u Bits %u\n",
acpi_ut_get_type_name(source_desc->common.
type),
source_desc->common.type,
(u32)source_desc->integer.value,
obj_desc->field.pin_number_index,
obj_desc->field.bit_length));
buffer = &source_desc->integer.value;
/* Lock entire transaction if requested */
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Perform the write */
/* SMBus, GSBus, IPMI serial */
status =
acpi_ex_access_region(obj_desc, 0, (u64 *)buffer,
ACPI_WRITE);
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
acpi_ex_write_serial_bus(source_desc, obj_desc,
result_desc);
return_ACPI_STATUS(status);
}
@ -490,23 +299,22 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
case ACPI_TYPE_INTEGER:
buffer = &source_desc->integer.value;
length = sizeof(source_desc->integer.value);
buffer_length = sizeof(source_desc->integer.value);
break;
case ACPI_TYPE_BUFFER:
buffer = source_desc->buffer.pointer;
length = source_desc->buffer.length;
buffer_length = source_desc->buffer.length;
break;
case ACPI_TYPE_STRING:
buffer = source_desc->string.pointer;
length = source_desc->string.length;
buffer_length = source_desc->string.length;
break;
default:
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
@ -514,7 +322,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
source_desc,
acpi_ut_get_type_name(source_desc->common.type),
source_desc->common.type, buffer, length));
source_desc->common.type, buffer, buffer_length));
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
@ -531,8 +339,352 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
/* Write to the field */
status = acpi_ex_insert_into_field(obj_desc, buffer, length);
status = acpi_ex_insert_into_field(obj_desc, buffer, buffer_length);
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_read_gpio
*
* PARAMETERS: obj_desc - The named field to read
* buffer - Where the return data is returnd
*
* RETURN: Status
*
* DESCRIPTION: Read from a named field that references a Generic Serial Bus
* field
*
******************************************************************************/
static acpi_status
acpi_ex_read_gpio(union acpi_operand_object *obj_desc, void *buffer)
{
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ex_read_gpio, obj_desc);
/*
* For GPIO (general_purpose_io), the Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The bit_length is the length of the field, which
* is thus the number of pins.
*/
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"GPIO FieldRead [FROM]: Pin %u Bits %u\n",
obj_desc->field.pin_number_index,
obj_desc->field.bit_length));
/* Lock entire transaction if requested */
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Perform the read */
status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_READ);
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_write_gpio
*
* PARAMETERS: source_desc - Contains data to write. Expect to be
* an Integer object.
* obj_desc - The named field
* result_desc - Where the return value is returned, if any
*
* RETURN: Status
*
* DESCRIPTION: Write to a named field that references a General Purpose I/O
* field.
*
******************************************************************************/
static acpi_status
acpi_ex_write_gpio(union acpi_operand_object *source_desc,
union acpi_operand_object *obj_desc,
union acpi_operand_object **return_buffer)
{
acpi_status status;
void *buffer;
ACPI_FUNCTION_TRACE_PTR(ex_write_gpio, obj_desc);
/*
* For GPIO (general_purpose_io), we will bypass the entire field
* mechanism and handoff the bit address and bit width directly to
* the handler. The Address will be the bit offset
* from the previous Connection() operator, making it effectively a
* pin number index. The bit_length is the length of the field, which
* is thus the number of pins.
*/
if (source_desc->common.type != ACPI_TYPE_INTEGER) {
return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
}
ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
"GPIO FieldWrite [FROM]: (%s:%X), Value %.8X [TO]: Pin %u Bits %u\n",
acpi_ut_get_type_name(source_desc->common.type),
source_desc->common.type,
(u32)source_desc->integer.value,
obj_desc->field.pin_number_index,
obj_desc->field.bit_length));
buffer = &source_desc->integer.value;
/* Lock entire transaction if requested */
acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
/* Perform the write */
status = acpi_ex_access_region(obj_desc, 0, (u64 *)buffer, ACPI_WRITE);
acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_read_serial_bus
*
* PARAMETERS: obj_desc - The named field to read
* return_buffer - Where the return value is returned, if any
*
* RETURN: Status
*
* DESCRIPTION: Read from a named field that references a serial bus
* (SMBus, IPMI, or GSBus).
*
******************************************************************************/
static acpi_status
acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
union acpi_operand_object **return_buffer)
{
acpi_status status;
u32 buffer_length;
union acpi_operand_object *buffer_desc;
u32 function;
u16 accessor_type;
ACPI_FUNCTION_TRACE_PTR(ex_read_serial_bus, obj_desc);
/*
* This is an SMBus, GSBus or IPMI read. We must create a buffer to
* hold the data and then directly access the region handler.
*
* Note: SMBus and GSBus protocol value 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)
*/
switch (obj_desc->field.region_obj->region.space_id) {
case ACPI_ADR_SPACE_SMBUS:
buffer_length = ACPI_SMBUS_BUFFER_SIZE;
function = ACPI_READ | (obj_desc->field.attribute << 16);
break;
case ACPI_ADR_SPACE_IPMI:
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);
}

18
include/acpi/acconfig.h
View File

@ -173,12 +173,20 @@
#define ACPI_RSDP_CHECKSUM_LENGTH 20
#define ACPI_RSDP_XCHECKSUM_LENGTH 36
/* SMBus, GSBus and IPMI bidirectional buffer size */
/*
* SMBus, GSBus and IPMI buffer sizes. All have a 2-byte header,
* containing both Status and Length.
*/
#define ACPI_SERIAL_HEADER_SIZE 2 /* Common for below. Status and Length fields */
#define ACPI_SMBUS_BUFFER_SIZE 34
#define ACPI_IPMI_BUFFER_SIZE 66
#define ACPI_GSBUS_BUFFER_SIZE 34 /* Not clear if this is needed */
#define ACPI_MAX_GSBUS_BUFFER_SIZE 255 /* Worst-case bidirectional buffer */
#define ACPI_SMBUS_DATA_SIZE 32
#define ACPI_SMBUS_BUFFER_SIZE ACPI_SERIAL_HEADER_SIZE + ACPI_SMBUS_DATA_SIZE
#define ACPI_IPMI_DATA_SIZE 64
#define ACPI_IPMI_BUFFER_SIZE ACPI_SERIAL_HEADER_SIZE + ACPI_IPMI_DATA_SIZE
#define ACPI_MAX_GSBUS_DATA_SIZE 255
#define ACPI_MAX_GSBUS_BUFFER_SIZE ACPI_SERIAL_HEADER_SIZE + ACPI_MAX_GSBUS_DATA_SIZE
/* _sx_d and _sx_w control methods */