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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_get_irq
*
* PARAMETERS: Aml - Pointer to the AML resource descriptor
* aml_resource_length - Length of the resource from the AML header
* Resource - Where the internal resource is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert a raw AML resource descriptor to the corresponding
* internal resource descriptor, simplifying bitflags and handling
* alignment and endian issues if necessary.
*
******************************************************************************/
acpi_status
acpi_rs_get_irq(union aml_resource *aml,
u16 aml_resource_length, struct acpi_resource *resource)
{
u16 temp16 = 0;
u32 interrupt_count = 0;
u32 i;
u32 resource_length;
ACPI_FUNCTION_TRACE("rs_get_irq");
/* Get the IRQ mask (bytes 1:2) */
ACPI_MOVE_16_TO_16(&temp16, &aml->irq.irq_mask);
/* Decode the IRQ bits (up to 16 possible) */
for (i = 0; i < 16; i++) {
if ((temp16 >> i) & 0x01) {
resource->data.irq.interrupts[interrupt_count] = i;
interrupt_count++;
}
}
/* Zero interrupts is valid */
resource_length = 0;
resource->data.irq.interrupt_count = interrupt_count;
if (interrupt_count > 0) {
/* Calculate the structure size based upon the number of interrupts */
resource_length = (u32) (interrupt_count - 1) * 4;
}
/* Get Flags (Byte 3) if it is used */
if (aml_resource_length == 3) {
/* Check for HE, LL interrupts */
switch (aml->irq.flags & 0x09) {
case 0x01: /* HE */
resource->data.irq.triggering = ACPI_EDGE_SENSITIVE;
resource->data.irq.polarity = ACPI_ACTIVE_HIGH;
break;
case 0x08: /* LL */
resource->data.irq.triggering = ACPI_LEVEL_SENSITIVE;
resource->data.irq.polarity = 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",
aml->irq.flags));
return_ACPI_STATUS(AE_BAD_DATA);
}
/* Get Sharing flag */
resource->data.irq.sharable = (aml->irq.flags >> 3) & 0x01;
} else {
/*
* Default configuration: assume Edge Sensitive, Active High,
* Non-Sharable as per the ACPI Specification
*/
resource->data.irq.triggering = ACPI_EDGE_SENSITIVE;
resource->data.irq.polarity = ACPI_ACTIVE_HIGH;
resource->data.irq.sharable = ACPI_EXCLUSIVE;
}
/* Complete the resource header */
resource->type = ACPI_RESOURCE_TYPE_IRQ;
resource->length =
resource_length + ACPI_SIZEOF_RESOURCE(struct acpi_resource_irq);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_irq
*
* PARAMETERS: Resource - Pointer to the resource descriptor
* Aml - Where the AML descriptor is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert an internal resource descriptor to the corresponding
* external AML resource descriptor.
*
******************************************************************************/
acpi_status
acpi_rs_set_irq(struct acpi_resource *resource, union aml_resource *aml)
{
acpi_size descriptor_length;
u16 irq_mask;
u8 i;
ACPI_FUNCTION_TRACE("rs_set_irq");
/* Convert interrupt list to 16-bit IRQ bitmask */
irq_mask = 0;
for (i = 0; i < resource->data.irq.interrupt_count; i++) {
irq_mask |= (1 << resource->data.irq.interrupts[i]);
}
/* Set the interrupt mask */
ACPI_MOVE_16_TO_16(&aml->irq.irq_mask, &irq_mask);
/*
* The descriptor field is set based upon whether a third byte is
* needed to contain the IRQ Information.
*/
if ((resource->data.irq.triggering == ACPI_EDGE_SENSITIVE) &&
(resource->data.irq.polarity == ACPI_ACTIVE_HIGH) &&
(resource->data.irq.sharable == ACPI_EXCLUSIVE)) {
/* irq_no_flags() descriptor can be used */
descriptor_length = sizeof(struct aml_resource_irq_noflags);
} else {
/* Irq() descriptor must be used */
descriptor_length = sizeof(struct aml_resource_irq);
/* Set the IRQ Info byte */
aml->irq.flags = (u8)
((resource->data.irq.sharable & 0x01) << 4);
if (ACPI_LEVEL_SENSITIVE == resource->data.irq.triggering &&
ACPI_ACTIVE_LOW == resource->data.irq.polarity) {
aml->irq.flags |= 0x08;
} else {
aml->irq.flags |= 0x01;
}
}
/* Complete the AML descriptor header */
acpi_rs_set_resource_header(ACPI_RESOURCE_NAME_IRQ, descriptor_length,
aml);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_get_ext_irq
*
* PARAMETERS: Aml - Pointer to the AML resource descriptor
* aml_resource_length - Length of the resource from the AML header
* Resource - Where the internal resource is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert a raw AML resource descriptor to the corresponding
* internal resource descriptor, simplifying bitflags and handling
* alignment and endian issues if necessary.
*
******************************************************************************/
acpi_status
acpi_rs_get_ext_irq(union aml_resource *aml,
u16 aml_resource_length, struct acpi_resource *resource)
{
char *out_resource_string;
u8 temp8;
ACPI_FUNCTION_TRACE("rs_get_ext_irq");
/* Get the flag bits */
temp8 = aml->extended_irq.flags;
resource->data.extended_irq.producer_consumer = temp8 & 0x01;
resource->data.extended_irq.polarity = (temp8 >> 2) & 0x01;
resource->data.extended_irq.sharable = (temp8 >> 3) & 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
*/
resource->data.extended_irq.triggering =
(temp8 & 0x2) ? ACPI_EDGE_SENSITIVE : ACPI_LEVEL_SENSITIVE;
/* Get the IRQ Table length (Byte4) */
temp8 = aml->extended_irq.table_length;
resource->data.extended_irq.interrupt_count = temp8;
if (temp8 < 1) {
/* Must have at least one IRQ */
return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
}
/*
* Add any additional structure size to properly calculate
* the next pointer at the end of this function
*/
resource->length = (temp8 - 1) * 4;
out_resource_string = ACPI_CAST_PTR(char,
(&resource->data.extended_irq.
interrupts[0] + temp8));
/* Get every IRQ in the table, each is 32 bits */
acpi_rs_move_data(resource->data.extended_irq.interrupts,
aml->extended_irq.interrupt_number,
(u16) temp8, ACPI_MOVE_TYPE_32_TO_32);
/* Get the optional resource_source (index and string) */
resource->length +=
acpi_rs_get_resource_source(aml_resource_length,
(acpi_size) resource->length +
sizeof(struct
aml_resource_extended_irq),
&resource->data.extended_irq.
resource_source, aml,
out_resource_string);
/* Complete the resource header */
resource->type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
resource->length +=
ACPI_SIZEOF_RESOURCE(struct acpi_resource_extended_irq);
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_rs_set_ext_irq
*
* PARAMETERS: Resource - Pointer to the resource descriptor
* Aml - Where the AML descriptor is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert an internal resource descriptor to the corresponding
* external AML resource descriptor.
*
******************************************************************************/
acpi_status
acpi_rs_set_ext_irq(struct acpi_resource *resource, union aml_resource *aml)
{
acpi_size descriptor_length;
ACPI_FUNCTION_TRACE("rs_set_ext_irq");
/* Set the Interrupt vector flags */
aml->extended_irq.flags = (u8)
((resource->data.extended_irq.producer_consumer & 0x01) |
((resource->data.extended_irq.sharable & 0x01) << 3) |
((resource->data.extended_irq.polarity & 0x1) << 2));
/*
* 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 (resource->data.extended_irq.triggering == ACPI_EDGE_SENSITIVE) {
aml->extended_irq.flags |= 0x02;
}
/* Set the Interrupt table length */
aml->extended_irq.table_length = (u8)
resource->data.extended_irq.interrupt_count;
descriptor_length = (sizeof(struct aml_resource_extended_irq) - 4) +
((acpi_size) resource->data.extended_irq.interrupt_count *
sizeof(u32));
/* Set each interrupt value */
acpi_rs_move_data(aml->extended_irq.interrupt_number,
resource->data.extended_irq.interrupts,
(u16) resource->data.extended_irq.interrupt_count,
ACPI_MOVE_TYPE_32_TO_32);
/* Resource Source Index and Resource Source are optional */
descriptor_length = acpi_rs_set_resource_source(aml, descriptor_length,
&resource->data.
extended_irq.
resource_source);
/* Complete the AML descriptor header */
acpi_rs_set_resource_header(ACPI_RESOURCE_NAME_EXTENDED_IRQ,
descriptor_length, aml);
return_ACPI_STATUS(AE_OK);
}
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