rsirq.c

linux-2.6.15.6

/*******************************************************************************
 *
 * 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