#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exfield")
-/* Local prototypes */
-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 */
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);
-}
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