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linux/drivers/acpi/resources/rsirq.c

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/*******************************************************************************
*
* Module Name: rsirq - IRQ resource descriptors
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include <acpi/acresrc.h>
#define _COMPONENT ACPI_RESOURCES
ACPI_MODULE_NAME("rsirq")
/*******************************************************************************
*
* FUNCTION: acpi_rs_irq_resource
*
* PARAMETERS: byte_stream_buffer - Pointer to the resource input byte
* stream
* bytes_consumed - Pointer to where the number of bytes
* consumed the byte_stream_buffer is
* returned
* output_buffer - Pointer to the return data buffer
* structure_size - Pointer to where the number of bytes
* in the return data struct is returned
*
* RETURN: Status
*
* DESCRIPTION: Take the resource byte stream and fill out the appropriate
* structure pointed to by the output_buffer. Return the
* number of bytes consumed from the byte stream.
*
******************************************************************************/
acpi_status
acpi_rs_irq_resource(u8 * byte_stream_buffer,
acpi_size * bytes_consumed,
u8 ** output_buffer, acpi_size * structure_size)
{
u8 *buffer = byte_stream_buffer;
struct acpi_resource *output_struct = (void *)*output_buffer;
u16 temp16 = 0;
u8 temp8 = 0;
u8 index;
u8 i;
acpi_size struct_size = ACPI_SIZEOF_RESOURCE(struct acpi_resource_irq);
ACPI_FUNCTION_TRACE("rs_irq_resource");
/*
* The number of bytes consumed are contained in the descriptor
* (Bits:0-1)
*/
temp8 = *buffer;
*bytes_consumed = (temp8 & 0x03) + 1;
output_struct->id = ACPI_RSTYPE_IRQ;
/* Point to the 16-bits of Bytes 1 and 2 */
buffer += 1;
ACPI_MOVE_16_TO_16(&temp16, buffer);
output_struct->data.irq.number_of_interrupts = 0;
/* Decode the IRQ bits */
for (i = 0, index = 0; index < 16; index++) {
if ((temp16 >> index) & 0x01) {
output_struct->data.irq.interrupts[i] = index;
i++;
}
}
/* Zero interrupts is valid */
output_struct->data.irq.number_of_interrupts = i;
if (i > 0) {
/* Calculate the structure size based upon the number of interrupts */
struct_size += ((acpi_size) i - 1) * 4;
}
/* Point to Byte 3 if it is used */
if (4 == *bytes_consumed) {
buffer += 2;
temp8 = *buffer;
/* Check for HE, LL interrupts */
switch (temp8 & 0x09) {
case 0x01: /* HE */
output_struct->data.irq.edge_level =
ACPI_EDGE_SENSITIVE;
output_struct->data.irq.active_high_low =
ACPI_ACTIVE_HIGH;
break;
case 0x08: /* LL */
output_struct->data.irq.edge_level =
ACPI_LEVEL_SENSITIVE;
output_struct->data.irq.active_high_low =
ACPI_ACTIVE_LOW;
break;
default:
/*
* Only _LL and _HE polarity/trigger interrupts
* are allowed (ACPI spec, section "IRQ Format")
* so 0x00 and 0x09 are illegal.
*/
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid interrupt polarity/trigger in resource list, %X\n",
temp8));
return_ACPI_STATUS(AE_BAD_DATA);
}
/* Check for sharable */
output_struct->data.irq.shared_exclusive = (temp8 >> 3) & 0x01;
} else {
/*
* Assume Edge Sensitive, Active High, Non-Sharable
* per ACPI Specification
*/
output_struct->data.irq.edge_level = ACPI_EDGE_SENSITIVE;
output_struct->data.irq.active_high_low = ACPI_ACTIVE_HIGH;
output_struct->data.irq.shared_exclusive = ACPI_EXCLUSIVE;
}
/* Set the Length parameter */
output_struct->length = (u32) struct_size;
/* Return the final size of the structure */
*structure_size = struct_size;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_irq_stream
*
* PARAMETERS: linked_list - Pointer to the resource linked list
* output_buffer - Pointer to the user's return buffer
* bytes_consumed - Pointer to where the number of bytes
* used in the output_buffer is returned
*
* RETURN: Status
*
* DESCRIPTION: Take the linked list resource structure and fills in the
* the appropriate bytes in a byte stream
*
******************************************************************************/
acpi_status
acpi_rs_irq_stream(struct acpi_resource *linked_list,
u8 ** output_buffer, acpi_size * bytes_consumed)
{
u8 *buffer = *output_buffer;
u16 temp16 = 0;
u8 temp8 = 0;
u8 index;
u8 IRqinfo_byte_needed;
ACPI_FUNCTION_TRACE("rs_irq_stream");
/*
* The descriptor field is set based upon whether a third byte is
* needed to contain the IRQ Information.
*/
if (ACPI_EDGE_SENSITIVE == linked_list->data.irq.edge_level &&
ACPI_ACTIVE_HIGH == linked_list->data.irq.active_high_low &&
ACPI_EXCLUSIVE == linked_list->data.irq.shared_exclusive) {
*buffer = 0x22;
IRqinfo_byte_needed = FALSE;
} else {
*buffer = 0x23;
IRqinfo_byte_needed = TRUE;
}
buffer += 1;
temp16 = 0;
/* Loop through all of the interrupts and set the mask bits */
for (index = 0;
index < linked_list->data.irq.number_of_interrupts; index++) {
temp8 = (u8) linked_list->data.irq.interrupts[index];
temp16 |= 0x1 << temp8;
}
ACPI_MOVE_16_TO_16(buffer, &temp16);
buffer += 2;
/* Set the IRQ Info byte if needed. */
if (IRqinfo_byte_needed) {
temp8 = 0;
temp8 = (u8) ((linked_list->data.irq.shared_exclusive &
0x01) << 4);
if (ACPI_LEVEL_SENSITIVE == linked_list->data.irq.edge_level &&
ACPI_ACTIVE_LOW == linked_list->data.irq.active_high_low) {
temp8 |= 0x08;
} else {
temp8 |= 0x01;
}
*buffer = temp8;
buffer += 1;
}
/* Return the number of bytes consumed in this operation */
*bytes_consumed = ACPI_PTR_DIFF(buffer, *output_buffer);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_extended_irq_resource
*
* PARAMETERS: byte_stream_buffer - Pointer to the resource input byte
* stream
* bytes_consumed - Pointer to where the number of bytes
* consumed the byte_stream_buffer is
* returned
* output_buffer - Pointer to the return data buffer
* structure_size - Pointer to where the number of bytes
* in the return data struct is returned
*
* RETURN: Status
*
* DESCRIPTION: Take the resource byte stream and fill out the appropriate
* structure pointed to by the output_buffer. Return the
* number of bytes consumed from the byte stream.
*
******************************************************************************/
acpi_status
acpi_rs_extended_irq_resource(u8 * byte_stream_buffer,
acpi_size * bytes_consumed,
u8 ** output_buffer, acpi_size * structure_size)
{
u8 *buffer = byte_stream_buffer;
struct acpi_resource *output_struct = (void *)*output_buffer;
u16 temp16 = 0;
u8 temp8 = 0;
u8 *temp_ptr;
u8 index;
acpi_size struct_size =
ACPI_SIZEOF_RESOURCE(struct acpi_resource_ext_irq);
ACPI_FUNCTION_TRACE("rs_extended_irq_resource");
/* Get the Descriptor Length field */
buffer += 1;
ACPI_MOVE_16_TO_16(&temp16, buffer);
/* Validate minimum descriptor length */
if (temp16 < 6) {
return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
}
*bytes_consumed = temp16 + 3;
output_struct->id = ACPI_RSTYPE_EXT_IRQ;
/* Point to the Byte3 */
buffer += 2;
temp8 = *buffer;
output_struct->data.extended_irq.producer_consumer = temp8 & 0x01;
/*
* Check for Interrupt Mode
*
* The definition of an Extended IRQ changed between ACPI spec v1.0b
* and ACPI spec 2.0 (section 6.4.3.6 in both).
*
* - Edge/Level are defined opposite in the table vs the headers
*/
output_struct->data.extended_irq.edge_level =
(temp8 & 0x2) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
/* Check Interrupt Polarity */
output_struct->data.extended_irq.active_high_low = (temp8 >> 2) & 0x1;
/* Check for sharable */
output_struct->data.extended_irq.shared_exclusive = (temp8 >> 3) & 0x01;
/* Point to Byte4 (IRQ Table length) */
buffer += 1;
temp8 = *buffer;
/* Must have at least one IRQ */
if (temp8 < 1) {
return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
}
output_struct->data.extended_irq.number_of_interrupts = temp8;
/*
* Add any additional structure size to properly calculate
* the next pointer at the end of this function
*/
struct_size += (temp8 - 1) * 4;
/* Point to Byte5 (First IRQ Number) */
buffer += 1;
/* Cycle through every IRQ in the table */
for (index = 0; index < temp8; index++) {
ACPI_MOVE_32_TO_32(&output_struct->data.extended_irq.
interrupts[index], buffer);
/* Point to the next IRQ */
buffer += 4;
}
/*
* This will leave us pointing to the Resource Source Index
* If it is present, then save it off and calculate the
* pointer to where the null terminated string goes:
* Each Interrupt takes 32-bits + the 5 bytes of the
* stream that are default.
*
* Note: Some resource descriptors will have an additional null, so
* we add 1 to the length.
*/
if (*bytes_consumed >
((acpi_size) output_struct->data.extended_irq.number_of_interrupts *
4) + (5 + 1)) {
/* Dereference the Index */
temp8 = *buffer;
output_struct->data.extended_irq.resource_source.index =
(u32) temp8;
/* Point to the String */
buffer += 1;
/* Point the String pointer to the end of this structure. */
output_struct->data.extended_irq.resource_source.string_ptr =
(char *)((char *)output_struct + struct_size);
temp_ptr = (u8 *)
output_struct->data.extended_irq.resource_source.string_ptr;
/* Copy the string into the buffer */
index = 0;
while (*buffer) {
*temp_ptr = *buffer;
temp_ptr += 1;
buffer += 1;
index += 1;
}
/* Add the terminating null */
*temp_ptr = 0;
output_struct->data.extended_irq.resource_source.string_length =
index + 1;
/*
* In order for the struct_size to fall on a 32-bit boundary,
* calculate the length of the string and expand the
* struct_size to the next 32-bit boundary.
*/
temp8 = (u8) (index + 1);
struct_size += ACPI_ROUND_UP_to_32_bITS(temp8);
} else {
output_struct->data.extended_irq.resource_source.index = 0;
output_struct->data.extended_irq.resource_source.string_length =
0;
output_struct->data.extended_irq.resource_source.string_ptr =
NULL;
}
/* Set the Length parameter */
output_struct->length = (u32) struct_size;
/* Return the final size of the structure */
*structure_size = struct_size;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_extended_irq_stream
*
* PARAMETERS: linked_list - Pointer to the resource linked list
* output_buffer - Pointer to the user's return buffer
* bytes_consumed - Pointer to where the number of bytes
* used in the output_buffer is returned
*
* RETURN: Status
*
* DESCRIPTION: Take the linked list resource structure and fills in the
* the appropriate bytes in a byte stream
*
******************************************************************************/
acpi_status
acpi_rs_extended_irq_stream(struct acpi_resource *linked_list,
u8 ** output_buffer, acpi_size * bytes_consumed)
{
u8 *buffer = *output_buffer;
u16 *length_field;
u8 temp8 = 0;
u8 index;
ACPI_FUNCTION_TRACE("rs_extended_irq_stream");
/* Set the Descriptor Type field */
*buffer = ACPI_RDESC_TYPE_EXTENDED_XRUPT;
buffer += 1;
/* Save a pointer to the Length field - to be filled in later */
length_field = ACPI_CAST_PTR(u16, buffer);
buffer += 2;
/* Set the Interrupt vector flags */
temp8 = (u8) (linked_list->data.extended_irq.producer_consumer & 0x01);
temp8 |=
((linked_list->data.extended_irq.shared_exclusive & 0x01) << 3);
/*
* Set the Interrupt Mode
*
* The definition of an Extended IRQ changed between ACPI spec v1.0b
* and ACPI spec 2.0 (section 6.4.3.6 in both). This code does not
* implement the more restrictive definition of 1.0b
*
* - Edge/Level are defined opposite in the table vs the headers
*/
if (ACPI_EDGE_SENSITIVE == linked_list->data.extended_irq.edge_level) {
temp8 |= 0x2;
}
/* Set the Interrupt Polarity */
temp8 |= ((linked_list->data.extended_irq.active_high_low & 0x1) << 2);
*buffer = temp8;
buffer += 1;
/* Set the Interrupt table length */
temp8 = (u8) linked_list->data.extended_irq.number_of_interrupts;
*buffer = temp8;
buffer += 1;
for (index = 0;
index < linked_list->data.extended_irq.number_of_interrupts;
index++) {
ACPI_MOVE_32_TO_32(buffer,
&linked_list->data.extended_irq.
interrupts[index]);
buffer += 4;
}
/* Resource Source Index and Resource Source are optional */
if (0 != linked_list->data.extended_irq.resource_source.string_length) {
*buffer =
(u8) linked_list->data.extended_irq.resource_source.index;
buffer += 1;
/* Copy the string */
ACPI_STRCPY((char *)buffer,
linked_list->data.extended_irq.resource_source.
string_ptr);
/*
* Buffer needs to be set to the length of the string + one for the
* terminating null
*/
buffer +=
(acpi_size) (ACPI_STRLEN
(linked_list->data.extended_irq.
resource_source.string_ptr) + 1);
}
/* Return the number of bytes consumed in this operation */
*bytes_consumed = ACPI_PTR_DIFF(buffer, *output_buffer);
/*
* Set the length field to the number of bytes consumed
* minus the header size (3 bytes)
*/
*length_field = (u16) (*bytes_consumed - 3);
return_ACPI_STATUS(AE_OK);
}
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