patch-2.4.22 linux-2.4.22/drivers/acpi/events/evgpeblk.c

Next file: linux-2.4.22/drivers/acpi/events/evmisc.c
Previous file: linux-2.4.22/drivers/acpi/events/evgpe.c
Back to the patch index
Back to the overall index

diff -urN linux-2.4.21/drivers/acpi/events/evgpeblk.c linux-2.4.22/drivers/acpi/events/evgpeblk.c
@@ -0,0 +1,903 @@
+/******************************************************************************
+ *
+ * Module Name: evgpeblk - GPE block creation and initialization.
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2003, 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/acevents.h>
+#include <acpi/acnamesp.h>
+
+#define _COMPONENT          ACPI_EVENTS
+	 ACPI_MODULE_NAME    ("evgpeblk")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_valid_gpe_event
+ *
+ * PARAMETERS:  gpe_event_info - Info for this GPE
+ *
+ * RETURN:      TRUE if the gpe_event is valid
+ *
+ * DESCRIPTION: Validate a GPE event.  DO NOT CALL FROM INTERRUPT LEVEL.
+ *              Should be called only when the GPE lists are semaphore locked
+ *              and not subject to change.
+ *
+ ******************************************************************************/
+
+u8
+acpi_ev_valid_gpe_event (
+	struct acpi_gpe_event_info      *gpe_event_info)
+{
+	struct acpi_gpe_xrupt_info      *gpe_xrupt_block;
+	struct acpi_gpe_block_info      *gpe_block;
+
+
+	ACPI_FUNCTION_ENTRY ();
+
+
+	/* No need for spin lock since we are not changing any list elements */
+
+	/* Walk the GPE interrupt levels */
+
+	gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
+	while (gpe_xrupt_block) {
+		gpe_block = gpe_xrupt_block->gpe_block_list_head;
+
+		/* Walk the GPE blocks on this interrupt level */
+
+		while (gpe_block) {
+			if ((&gpe_block->event_info[0] <= gpe_event_info) &&
+				(&gpe_block->event_info[((acpi_size) gpe_block->register_count) * 8] > gpe_event_info)) {
+				return (TRUE);
+			}
+
+			gpe_block = gpe_block->next;
+		}
+
+		gpe_xrupt_block = gpe_xrupt_block->next;
+	}
+
+	return (FALSE);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_walk_gpe_list
+ *
+ * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Walk the GPE lists.
+ *              FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_walk_gpe_list (
+	ACPI_GPE_CALLBACK       gpe_walk_callback)
+{
+	struct acpi_gpe_block_info      *gpe_block;
+	struct acpi_gpe_xrupt_info      *gpe_xrupt_info;
+	acpi_status                     status = AE_OK;
+
+
+	ACPI_FUNCTION_TRACE ("ev_walk_gpe_list");
+
+
+	acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_ISR);
+
+	/* Walk the interrupt level descriptor list */
+
+	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
+	while (gpe_xrupt_info) {
+		/* Walk all Gpe Blocks attached to this interrupt level */
+
+		gpe_block = gpe_xrupt_info->gpe_block_list_head;
+		while (gpe_block) {
+			/* One callback per GPE block */
+
+			status = gpe_walk_callback (gpe_xrupt_info, gpe_block);
+			if (ACPI_FAILURE (status)) {
+				goto unlock_and_exit;
+			}
+
+			gpe_block = gpe_block->next;
+		}
+
+		gpe_xrupt_info = gpe_xrupt_info->next;
+	}
+
+unlock_and_exit:
+	acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_ISR);
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_save_method_info
+ *
+ * PARAMETERS:  Callback from walk_namespace
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
+ *              control method under the _GPE portion of the namespace.
+ *              Extract the name and GPE type from the object, saving this
+ *              information for quick lookup during GPE dispatch
+ *
+ *              The name of each GPE control method is of the form:
+ *                  "_Lnn" or "_Enn"
+ *                  Where:
+ *                      L      - means that the GPE is level triggered
+ *                      E      - means that the GPE is edge triggered
+ *                      nn     - is the GPE number [in HEX]
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ev_save_method_info (
+	acpi_handle                     obj_handle,
+	u32                             level,
+	void                            *obj_desc,
+	void                            **return_value)
+{
+	struct acpi_gpe_block_info      *gpe_block = (void *) obj_desc;
+	struct acpi_gpe_event_info      *gpe_event_info;
+	u32                             gpe_number;
+	char                            name[ACPI_NAME_SIZE + 1];
+	u8                              type;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_save_method_info");
+
+
+	/* Extract the name from the object and convert to a string */
+
+	ACPI_MOVE_32_TO_32 (name,
+			   &((struct acpi_namespace_node *) obj_handle)->name.integer);
+	name[ACPI_NAME_SIZE] = 0;
+
+	/*
+	 * Edge/Level determination is based on the 2nd character
+	 * of the method name
+	 */
+	switch (name[1]) {
+	case 'L':
+		type = ACPI_EVENT_LEVEL_TRIGGERED;
+		break;
+
+	case 'E':
+		type = ACPI_EVENT_EDGE_TRIGGERED;
+		break;
+
+	default:
+		/* Unknown method type, just ignore it! */
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Unknown GPE method type: %s (name not of form _Lnn or _Enn)\n",
+			name));
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/* Convert the last two characters of the name to the GPE Number */
+
+	gpe_number = ACPI_STRTOUL (&name[2], NULL, 16);
+	if (gpe_number == ACPI_UINT32_MAX) {
+		/* Conversion failed; invalid method, just ignore it */
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Could not extract GPE number from name: %s (name is not of form _Lnn or _Enn)\n",
+			name));
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/* Ensure that we have a valid GPE number for this GPE block */
+
+	if ((gpe_number < gpe_block->block_base_number) ||
+		(gpe_number >= (gpe_block->block_base_number + (gpe_block->register_count * 8)))) {
+		/*
+		 * Not valid for this GPE block, just ignore it
+		 * However, it may be valid for a different GPE block, since GPE0 and GPE1
+		 * methods both appear under \_GPE.
+		 */
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/*
+	 * Now we can add this information to the gpe_event_info block
+	 * for use during dispatch of this GPE.
+	 */
+	gpe_event_info = &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
+
+	gpe_event_info->flags    = type;
+	gpe_event_info->method_node = (struct acpi_namespace_node *) obj_handle;
+
+	/* Enable the GPE (SCIs should be disabled at this point) */
+
+	status = acpi_hw_enable_gpe (gpe_event_info);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_LOAD,
+		"Registered GPE method %s as GPE number 0x%.2X\n",
+		name, gpe_number));
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_get_gpe_xrupt_block
+ *
+ * PARAMETERS:  interrupt_level     - Interrupt for a GPE block
+ *
+ * RETURN:      A GPE interrupt block
+ *
+ * DESCRIPTION: Get or Create a GPE interrupt block.  There is one interrupt
+ *              block per unique interrupt level used for GPEs.
+ *              Should be called only when the GPE lists are semaphore locked
+ *              and not subject to change.
+ *
+ ******************************************************************************/
+
+static struct acpi_gpe_xrupt_info *
+acpi_ev_get_gpe_xrupt_block (
+	u32                             interrupt_level)
+{
+	struct acpi_gpe_xrupt_info      *next_gpe_xrupt;
+	struct acpi_gpe_xrupt_info      *gpe_xrupt;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_get_gpe_xrupt_block");
+
+
+	/* No need for spin lock since we are not changing any list elements here */
+
+	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
+	while (next_gpe_xrupt) {
+		if (next_gpe_xrupt->interrupt_level == interrupt_level) {
+			return_PTR (next_gpe_xrupt);
+		}
+
+		next_gpe_xrupt = next_gpe_xrupt->next;
+	}
+
+	/* Not found, must allocate a new xrupt descriptor */
+
+	gpe_xrupt = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_xrupt_info));
+	if (!gpe_xrupt) {
+		return_PTR (NULL);
+	}
+
+	gpe_xrupt->interrupt_level = interrupt_level;
+
+	/* Install new interrupt descriptor with spin lock */
+
+	acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+	if (acpi_gbl_gpe_xrupt_list_head) {
+		next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
+		while (next_gpe_xrupt->next) {
+			next_gpe_xrupt = next_gpe_xrupt->next;
+		}
+
+		next_gpe_xrupt->next = gpe_xrupt;
+		gpe_xrupt->previous = next_gpe_xrupt;
+	}
+	else {
+		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
+	}
+	acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+
+	/* Install new interrupt handler if not SCI_INT */
+
+	if (interrupt_level != acpi_gbl_FADT->sci_int) {
+		status = acpi_os_install_interrupt_handler (interrupt_level,
+				 acpi_ev_gpe_xrupt_handler, gpe_xrupt);
+		if (ACPI_FAILURE (status)) {
+			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+				"Could not install GPE interrupt handler at level 0x%X\n",
+				interrupt_level));
+			return_PTR (NULL);
+		}
+	}
+
+	return_PTR (gpe_xrupt);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_delete_gpe_xrupt
+ *
+ * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
+ *              interrupt handler if not the SCI interrupt.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ev_delete_gpe_xrupt (
+	struct acpi_gpe_xrupt_info      *gpe_xrupt)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_delete_gpe_xrupt");
+
+
+	/* We never want to remove the SCI interrupt handler */
+
+	if (gpe_xrupt->interrupt_level == acpi_gbl_FADT->sci_int) {
+		gpe_xrupt->gpe_block_list_head = NULL;
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/* Disable this interrupt */
+
+	status = acpi_os_remove_interrupt_handler (gpe_xrupt->interrupt_level,
+			   acpi_ev_gpe_xrupt_handler);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/* Unlink the interrupt block with lock */
+
+	acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+	if (gpe_xrupt->previous) {
+		gpe_xrupt->previous->next = gpe_xrupt->next;
+	}
+
+	if (gpe_xrupt->next) {
+		gpe_xrupt->next->previous = gpe_xrupt->previous;
+	}
+	acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+
+	/* Free the block */
+
+	ACPI_MEM_FREE (gpe_xrupt);
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_gpe_block
+ *
+ * PARAMETERS:  gpe_block       - New GPE block
+ *              interrupt_level - Level to be associated with this GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install new GPE block with mutex support
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ev_install_gpe_block (
+	struct acpi_gpe_block_info      *gpe_block,
+	u32                             interrupt_level)
+{
+	struct acpi_gpe_block_info      *next_gpe_block;
+	struct acpi_gpe_xrupt_info      *gpe_xrupt_block;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_install_gpe_block");
+
+
+	status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block (interrupt_level);
+	if (!gpe_xrupt_block) {
+		status = AE_NO_MEMORY;
+		goto unlock_and_exit;
+	}
+
+	/* Install the new block at the end of the list for this interrupt with lock */
+
+	acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+	if (gpe_xrupt_block->gpe_block_list_head) {
+		next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
+		while (next_gpe_block->next) {
+			next_gpe_block = next_gpe_block->next;
+		}
+
+		next_gpe_block->next = gpe_block;
+		gpe_block->previous = next_gpe_block;
+	}
+	else {
+		gpe_xrupt_block->gpe_block_list_head = gpe_block;
+	}
+
+	gpe_block->xrupt_block = gpe_xrupt_block;
+	acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+
+unlock_and_exit:
+	status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_delete_gpe_block
+ *
+ * PARAMETERS:  gpe_block       - Existing GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install new GPE block with mutex support
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_delete_gpe_block (
+	struct acpi_gpe_block_info      *gpe_block)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_install_gpe_block");
+
+
+	status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/* Disable all GPEs in this block */
+
+	status = acpi_hw_disable_gpe_block (gpe_block->xrupt_block, gpe_block);
+
+	if (!gpe_block->previous && !gpe_block->next) {
+		/* This is the last gpe_block on this interrupt */
+
+		status = acpi_ev_delete_gpe_xrupt (gpe_block->xrupt_block);
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+	}
+	else {
+		/* Remove the block on this interrupt with lock */
+
+		acpi_os_acquire_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+		if (gpe_block->previous) {
+			gpe_block->previous->next = gpe_block->next;
+		}
+		else {
+			gpe_block->xrupt_block->gpe_block_list_head = gpe_block->next;
+		}
+
+		if (gpe_block->next) {
+			gpe_block->next->previous = gpe_block->previous;
+		}
+		acpi_os_release_lock (acpi_gbl_gpe_lock, ACPI_NOT_ISR);
+	}
+
+	/* Free the gpe_block */
+
+	ACPI_MEM_FREE (gpe_block->register_info);
+	ACPI_MEM_FREE (gpe_block->event_info);
+	ACPI_MEM_FREE (gpe_block);
+
+unlock_and_exit:
+	status = acpi_ut_release_mutex (ACPI_MTX_EVENTS);
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_create_gpe_info_blocks
+ *
+ * PARAMETERS:  gpe_block   - New GPE block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ev_create_gpe_info_blocks (
+	struct acpi_gpe_block_info      *gpe_block)
+{
+	struct acpi_gpe_register_info   *gpe_register_info = NULL;
+	struct acpi_gpe_event_info      *gpe_event_info = NULL;
+	struct acpi_gpe_event_info      *this_event;
+	struct acpi_gpe_register_info   *this_register;
+	acpi_native_uint                i;
+	acpi_native_uint                j;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_create_gpe_info_blocks");
+
+
+	/* Allocate the GPE register information block */
+
+	gpe_register_info = ACPI_MEM_CALLOCATE (
+			  (acpi_size) gpe_block->register_count *
+			  sizeof (struct acpi_gpe_register_info));
+	if (!gpe_register_info) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"Could not allocate the gpe_register_info table\n"));
+		return_ACPI_STATUS (AE_NO_MEMORY);
+	}
+
+	/*
+	 * Allocate the GPE event_info block. There are eight distinct GPEs
+	 * per register.  Initialization to zeros is sufficient.
+	 */
+	gpe_event_info = ACPI_MEM_CALLOCATE (
+			   ((acpi_size) gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH) *
+			   sizeof (struct acpi_gpe_event_info));
+	if (!gpe_event_info) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not allocate the gpe_event_info table\n"));
+		status = AE_NO_MEMORY;
+		goto error_exit;
+	}
+
+	/* Save the new Info arrays in the GPE block */
+
+	gpe_block->register_info = gpe_register_info;
+	gpe_block->event_info  = gpe_event_info;
+
+	/*
+	 * Initialize the GPE Register and Event structures.  A goal of these
+	 * tables is to hide the fact that there are two separate GPE register sets
+	 * in a given gpe hardware block, the status registers occupy the first half,
+	 * and the enable registers occupy the second half.
+	 */
+	this_register = gpe_register_info;
+	this_event   = gpe_event_info;
+
+	for (i = 0; i < gpe_block->register_count; i++) {
+		/* Init the register_info for this GPE register (8 GPEs) */
+
+		this_register->base_gpe_number = (u8) (gpe_block->block_base_number +
+				   (i * ACPI_GPE_REGISTER_WIDTH));
+
+		ACPI_STORE_ADDRESS (this_register->status_address.address,
+				 (gpe_block->block_address.address
+				 + i));
+
+		ACPI_STORE_ADDRESS (this_register->enable_address.address,
+				 (gpe_block->block_address.address
+				 + i
+				 + gpe_block->register_count));
+
+		this_register->status_address.address_space_id = gpe_block->block_address.address_space_id;
+		this_register->enable_address.address_space_id = gpe_block->block_address.address_space_id;
+		this_register->status_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;
+		this_register->enable_address.register_bit_width = ACPI_GPE_REGISTER_WIDTH;
+		this_register->status_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;
+		this_register->enable_address.register_bit_offset = ACPI_GPE_REGISTER_WIDTH;
+
+		/* Init the event_info for each GPE within this register */
+
+		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
+			this_event->bit_mask = acpi_gbl_decode_to8bit[j];
+			this_event->register_info = this_register;
+			this_event++;
+		}
+
+		/*
+		 * Clear the status/enable registers.  Note that status registers
+		 * are cleared by writing a '1', while enable registers are cleared
+		 * by writing a '0'.
+		 */
+		status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0x00,
+				 &this_register->enable_address);
+		if (ACPI_FAILURE (status)) {
+			goto error_exit;
+		}
+
+		status = acpi_hw_low_level_write (ACPI_GPE_REGISTER_WIDTH, 0xFF,
+				 &this_register->status_address);
+		if (ACPI_FAILURE (status)) {
+			goto error_exit;
+		}
+
+		this_register++;
+	}
+
+	return_ACPI_STATUS (AE_OK);
+
+
+error_exit:
+	if (gpe_register_info) {
+		ACPI_MEM_FREE (gpe_register_info);
+	}
+	if (gpe_event_info) {
+		ACPI_MEM_FREE (gpe_event_info);
+	}
+
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_create_gpe_block
+ *
+ * PARAMETERS:  gpe_device          - Handle to the parent GPE block
+ *              gpe_block_address   - Address and space_iD
+ *              register_count      - Number of GPE register pairs in the block
+ *              gpe_block_base_number - Starting GPE number for the block
+ *              interrupt_level     - H/W interrupt for the block
+ *              return_gpe_block    - Where the new block descriptor is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Create and Install a block of GPE registers
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_create_gpe_block (
+	struct acpi_namespace_node      *gpe_device,
+	struct acpi_generic_address     *gpe_block_address,
+	u32                             register_count,
+	u8                              gpe_block_base_number,
+	u32                             interrupt_level,
+	struct acpi_gpe_block_info      **return_gpe_block)
+{
+	struct acpi_gpe_block_info      *gpe_block;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_create_gpe_block");
+
+
+	if (!register_count) {
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/* Allocate a new GPE block */
+
+	gpe_block = ACPI_MEM_CALLOCATE (sizeof (struct acpi_gpe_block_info));
+	if (!gpe_block) {
+		return_ACPI_STATUS (AE_NO_MEMORY);
+	}
+
+	/* Initialize the new GPE block */
+
+	gpe_block->register_count = register_count;
+	gpe_block->block_base_number = gpe_block_base_number;
+
+	ACPI_MEMCPY (&gpe_block->block_address, gpe_block_address, sizeof (struct acpi_generic_address));
+
+	/* Create the register_info and event_info sub-structures */
+
+	status = acpi_ev_create_gpe_info_blocks (gpe_block);
+	if (ACPI_FAILURE (status)) {
+		ACPI_MEM_FREE (gpe_block);
+		return_ACPI_STATUS (status);
+	}
+
+	/* Install the new block in the global list(s) */
+
+	status = acpi_ev_install_gpe_block (gpe_block, interrupt_level);
+	if (ACPI_FAILURE (status)) {
+		ACPI_MEM_FREE (gpe_block);
+		return_ACPI_STATUS (status);
+	}
+
+	/* Dump info about this GPE block */
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "GPE %02d to %02d [%4.4s] %d regs at %8.8X%8.8X on int %d\n",
+		gpe_block->block_base_number,
+		(u32) (gpe_block->block_base_number +
+				((gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH) -1)),
+		gpe_device->name.ascii,
+		gpe_block->register_count,
+		ACPI_HIDWORD (gpe_block->block_address.address),
+		ACPI_LODWORD (gpe_block->block_address.address),
+		interrupt_level));
+
+	/* Find all GPE methods (_Lxx, _Exx) for this block */
+
+	status = acpi_ns_walk_namespace (ACPI_TYPE_METHOD, gpe_device,
+			  ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK, acpi_ev_save_method_info,
+			  gpe_block, NULL);
+
+	/* Return the new block */
+
+	if (return_gpe_block) {
+		(*return_gpe_block) = gpe_block;
+	}
+
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_gpe_initialize
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Initialize the GPE data structures
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_gpe_initialize (void)
+{
+	u32                             register_count0 = 0;
+	u32                             register_count1 = 0;
+	u32                             gpe_number_max = 0;
+	acpi_handle                     gpe_device;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_gpe_initialize");
+
+
+	/* Get a handle to the predefined _GPE object */
+
+	status = acpi_get_handle (NULL, "\\_GPE", &gpe_device);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/*
+	 * Initialize the GPE Blocks defined in the FADT
+	 *
+	 * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
+	 * section "General-Purpose Event Registers", we have:
+	 *
+	 * "Each register block contains two registers of equal length
+	 *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
+	 *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
+	 *  The length of the GPE1_STS and GPE1_EN registers is equal to
+	 *  half the GPE1_LEN. If a generic register block is not supported
+	 *  then its respective block pointer and block length values in the
+	 *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
+	 *  to be the same size."
+	 */
+
+	/*
+	 * Determine the maximum GPE number for this machine.
+	 *
+	 * Note: both GPE0 and GPE1 are optional, and either can exist without
+	 * the other.
+	 *
+	 * If EITHER the register length OR the block address are zero, then that
+	 * particular block is not supported.
+	 */
+	if (acpi_gbl_FADT->gpe0_blk_len &&
+		acpi_gbl_FADT->xgpe0_blk.address) {
+		/* GPE block 0 exists (has both length and address > 0) */
+
+		register_count0 = (u16) (acpi_gbl_FADT->gpe0_blk_len / 2);
+
+		gpe_number_max = (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
+
+		/* Install GPE Block 0 */
+
+		status = acpi_ev_create_gpe_block (gpe_device, &acpi_gbl_FADT->xgpe0_blk,
+				 register_count0, 0, acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[0]);
+		if (ACPI_FAILURE (status)) {
+			ACPI_REPORT_ERROR ((
+				"Could not create GPE Block 0, %s\n",
+				acpi_format_exception (status)));
+		}
+	}
+
+	if (acpi_gbl_FADT->gpe1_blk_len &&
+		acpi_gbl_FADT->xgpe1_blk.address) {
+		/* GPE block 1 exists (has both length and address > 0) */
+
+		register_count1 = (u16) (acpi_gbl_FADT->gpe1_blk_len / 2);
+
+		/* Check for GPE0/GPE1 overlap (if both banks exist) */
+
+		if ((register_count0) &&
+			(gpe_number_max >= acpi_gbl_FADT->gpe1_base)) {
+			ACPI_REPORT_ERROR ((
+				"GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1\n",
+				gpe_number_max, acpi_gbl_FADT->gpe1_base,
+				acpi_gbl_FADT->gpe1_base +
+				((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1)));
+
+			/* Ignore GPE1 block by setting the register count to zero */
+
+			register_count1 = 0;
+		}
+		else {
+			/* Install GPE Block 1 */
+
+			status = acpi_ev_create_gpe_block (gpe_device, &acpi_gbl_FADT->xgpe1_blk,
+					 register_count1, acpi_gbl_FADT->gpe1_base,
+					 acpi_gbl_FADT->sci_int, &acpi_gbl_gpe_fadt_blocks[1]);
+			if (ACPI_FAILURE (status)) {
+				ACPI_REPORT_ERROR ((
+					"Could not create GPE Block 1, %s\n",
+					acpi_format_exception (status)));
+			}
+
+			/*
+			 * GPE0 and GPE1 do not have to be contiguous in the GPE number
+			 * space. However, GPE0 always starts at GPE number zero.
+			 */
+			gpe_number_max = acpi_gbl_FADT->gpe1_base +
+					   ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
+		}
+	}
+
+	/* Exit if there are no GPE registers */
+
+	if ((register_count0 + register_count1) == 0) {
+		/* GPEs are not required by ACPI, this is OK */
+
+		ACPI_REPORT_INFO (("There are no GPE blocks defined in the FADT\n"));
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/* Check for Max GPE number out-of-range */
+
+	if (gpe_number_max > ACPI_GPE_MAX) {
+		ACPI_REPORT_ERROR (("Maximum GPE number from FADT is too large: 0x%X\n",
+			gpe_number_max));
+		return_ACPI_STATUS (AE_BAD_VALUE);
+	}
+
+	return_ACPI_STATUS (AE_OK);
+}
+
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)