diff options
Diffstat (limited to 'drivers/acpi/resources/rsirq.c')
| -rw-r--r-- | drivers/acpi/resources/rsirq.c | 592 |
1 files changed, 592 insertions, 0 deletions
diff --git a/drivers/acpi/resources/rsirq.c b/drivers/acpi/resources/rsirq.c new file mode 100644 index 000000000000..fd07a8702fbe --- /dev/null +++ b/drivers/acpi/resources/rsirq.c @@ -0,0 +1,592 @@ +/******************************************************************************* + * + * 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"); + + + /* + * Point past the Descriptor to get the number of bytes consumed + */ + 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 (0x00 != *buffer) { + *temp_ptr = *buffer; + + temp_ptr += 1; + buffer += 1; + index += 1; + } + + /* + * Add the terminating null + */ + *temp_ptr = 0x00; + 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 = 0x00; + 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; + char *temp_pointer = NULL; + + + ACPI_FUNCTION_TRACE ("rs_extended_irq_stream"); + + + /* + * The descriptor field is static + */ + *buffer = 0x89; + buffer += 1; + + /* + * Set 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; + + temp_pointer = (char *) buffer; + + /* + * Copy the string + */ + ACPI_STRCPY (temp_pointer, + linked_list->data.extended_irq.resource_source.string_ptr); + + /* + * Buffer needs to be set to the length of the sting + 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); +} + |
