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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [hardware/] [hwgpe.c] - Rev 1275
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/****************************************************************************** * * Module Name: hwgpe - Low level GPE enable/disable/clear functions * *****************************************************************************/ /* * Copyright (C) 2000 - 2004, 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> #define _COMPONENT ACPI_HARDWARE ACPI_MODULE_NAME ("hwgpe") /****************************************************************************** * * FUNCTION: acpi_hw_enable_gpe * * PARAMETERS: gpe_event_info - Info block for the GPE to be enabled * * RETURN: Status * * DESCRIPTION: Enable a single GPE. * ******************************************************************************/ acpi_status acpi_hw_enable_gpe ( struct acpi_gpe_event_info *gpe_event_info) { u32 in_byte; acpi_status status; ACPI_FUNCTION_ENTRY (); /* * Read the current value of the register, set the appropriate bit * to enable the GPE, and write out the new register. */ status = acpi_hw_low_level_read (8, &in_byte, &gpe_event_info->register_info->enable_address); if (ACPI_FAILURE (status)) { return (status); } /* Write with the new GPE bit enabled */ status = acpi_hw_low_level_write (8, (in_byte | gpe_event_info->bit_mask), &gpe_event_info->register_info->enable_address); return (status); } /****************************************************************************** * * FUNCTION: acpi_hw_enable_gpe_for_wakeup * * PARAMETERS: gpe_event_info - Info block for the GPE to be enabled * * RETURN: None * * DESCRIPTION: Keep track of which GPEs the OS has requested not be * disabled when going to sleep. * ******************************************************************************/ void acpi_hw_enable_gpe_for_wakeup ( struct acpi_gpe_event_info *gpe_event_info) { struct acpi_gpe_register_info *gpe_register_info; ACPI_FUNCTION_ENTRY (); /* Get the info block for the entire GPE register */ gpe_register_info = gpe_event_info->register_info; if (!gpe_register_info) { return; } /* * Set the bit so we will not enable this GPE when sleeping (and disable * it upon wake) */ gpe_register_info->wake_enable |= gpe_event_info->bit_mask; gpe_event_info->flags |= (ACPI_GPE_TYPE_WAKE | ACPI_GPE_ENABLED); } /****************************************************************************** * * FUNCTION: acpi_hw_disable_gpe * * PARAMETERS: gpe_event_info - Info block for the GPE to be disabled * * RETURN: Status * * DESCRIPTION: Disable a single GPE. * ******************************************************************************/ acpi_status acpi_hw_disable_gpe ( struct acpi_gpe_event_info *gpe_event_info) { u32 in_byte; acpi_status status; struct acpi_gpe_register_info *gpe_register_info; ACPI_FUNCTION_ENTRY (); /* Get the info block for the entire GPE register */ gpe_register_info = gpe_event_info->register_info; if (!gpe_register_info) { return (AE_BAD_PARAMETER); } /* * Read the current value of the register, clear the appropriate bit, * and write out the new register value to disable the GPE. */ status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->enable_address); if (ACPI_FAILURE (status)) { return (status); } /* Write the byte with this GPE bit cleared */ status = acpi_hw_low_level_write (8, (in_byte & ~(gpe_event_info->bit_mask)), &gpe_register_info->enable_address); if (ACPI_FAILURE (status)) { return (status); } /* Make sure this GPE is disabled for wake, also */ acpi_hw_disable_gpe_for_wakeup (gpe_event_info); return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_hw_disable_gpe_for_wakeup * * PARAMETERS: gpe_event_info - Info block for the GPE to be disabled * * RETURN: None * * DESCRIPTION: Keep track of which GPEs the OS has requested not be * disabled when going to sleep. * ******************************************************************************/ void acpi_hw_disable_gpe_for_wakeup ( struct acpi_gpe_event_info *gpe_event_info) { struct acpi_gpe_register_info *gpe_register_info; ACPI_FUNCTION_ENTRY (); /* Get the info block for the entire GPE register */ gpe_register_info = gpe_event_info->register_info; if (!gpe_register_info) { return; } /* Clear the bit so we will disable this when sleeping */ gpe_register_info->wake_enable &= ~(gpe_event_info->bit_mask); } /****************************************************************************** * * FUNCTION: acpi_hw_clear_gpe * * PARAMETERS: gpe_event_info - Info block for the GPE to be cleared * * RETURN: status_status * * DESCRIPTION: Clear the status bit for a single GPE. * ******************************************************************************/ acpi_status acpi_hw_clear_gpe ( struct acpi_gpe_event_info *gpe_event_info) { acpi_status status; ACPI_FUNCTION_ENTRY (); /* * Write a one to the appropriate bit in the status register to * clear this GPE. */ status = acpi_hw_low_level_write (8, gpe_event_info->bit_mask, &gpe_event_info->register_info->status_address); return (status); } /****************************************************************************** * * FUNCTION: acpi_hw_get_gpe_status * * PARAMETERS: gpe_event_info - Info block for the GPE to queried * event_status - Where the GPE status is returned * * RETURN: Status * * DESCRIPTION: Return the status of a single GPE. * ******************************************************************************/ acpi_status acpi_hw_get_gpe_status ( struct acpi_gpe_event_info *gpe_event_info, acpi_event_status *event_status) { u32 in_byte; u8 bit_mask; struct acpi_gpe_register_info *gpe_register_info; acpi_status status; acpi_event_status local_event_status = 0; ACPI_FUNCTION_ENTRY (); if (!event_status) { return (AE_BAD_PARAMETER); } /* Get the info block for the entire GPE register */ gpe_register_info = gpe_event_info->register_info; /* Get the register bitmask for this GPE */ bit_mask = gpe_event_info->bit_mask; /* GPE Enabled? */ status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->enable_address); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } if (bit_mask & in_byte) { local_event_status |= ACPI_EVENT_FLAG_ENABLED; } /* GPE Enabled for wake? */ if (bit_mask & gpe_register_info->wake_enable) { local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED; } /* GPE active (set)? */ status = acpi_hw_low_level_read (8, &in_byte, &gpe_register_info->status_address); if (ACPI_FAILURE (status)) { goto unlock_and_exit; } if (bit_mask & in_byte) { local_event_status |= ACPI_EVENT_FLAG_SET; } /* Set return value */ (*event_status) = local_event_status; unlock_and_exit: return (status); } /****************************************************************************** * * FUNCTION: acpi_hw_disable_gpe_block * * PARAMETERS: gpe_xrupt_info - GPE Interrupt info * gpe_block - Gpe Block info * * RETURN: Status * * DESCRIPTION: Disable all GPEs within a GPE block * ******************************************************************************/ acpi_status acpi_hw_disable_gpe_block ( struct acpi_gpe_xrupt_info *gpe_xrupt_info, struct acpi_gpe_block_info *gpe_block) { u32 i; acpi_status status; /* Examine each GPE Register within the block */ for (i = 0; i < gpe_block->register_count; i++) { /* Disable all GPEs in this register */ status = acpi_hw_low_level_write (8, 0x00, &gpe_block->register_info[i].enable_address); if (ACPI_FAILURE (status)) { return (status); } } return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_hw_clear_gpe_block * * PARAMETERS: gpe_xrupt_info - GPE Interrupt info * gpe_block - Gpe Block info * * RETURN: Status * * DESCRIPTION: Clear status bits for all GPEs within a GPE block * ******************************************************************************/ acpi_status acpi_hw_clear_gpe_block ( struct acpi_gpe_xrupt_info *gpe_xrupt_info, struct acpi_gpe_block_info *gpe_block) { u32 i; acpi_status status; /* Examine each GPE Register within the block */ for (i = 0; i < gpe_block->register_count; i++) { /* Clear status on all GPEs in this register */ status = acpi_hw_low_level_write (8, 0xFF, &gpe_block->register_info[i].status_address); if (ACPI_FAILURE (status)) { return (status); } } return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_hw_prepare_gpe_block_for_sleep * * PARAMETERS: gpe_xrupt_info - GPE Interrupt info * gpe_block - Gpe Block info * * RETURN: Status * * DESCRIPTION: Disable all runtime GPEs and enable all wakeup GPEs -- within * a single GPE block * ******************************************************************************/ static acpi_status acpi_hw_prepare_gpe_block_for_sleep ( struct acpi_gpe_xrupt_info *gpe_xrupt_info, struct acpi_gpe_block_info *gpe_block) { u32 i; struct acpi_gpe_register_info *gpe_register_info; u32 in_value; acpi_status status; /* Get the register info for the entire GPE block */ gpe_register_info = gpe_block->register_info; /* Examine each GPE Register within the block */ for (i = 0; i < gpe_block->register_count; i++) { /* * Read the enabled/disabled status of all GPEs. We * will be using it to restore all the GPEs later. * * NOTE: Wake GPEs are are ALL disabled at this time, so when we wake * and restore this register, they will be automatically disabled. */ status = acpi_hw_low_level_read (8, &in_value, &gpe_register_info->enable_address); if (ACPI_FAILURE (status)) { return (status); } gpe_register_info->enable = (u8) in_value; /* * 1) Disable all runtime GPEs * 2) Enable all wakeup GPEs */ status = acpi_hw_low_level_write (8, gpe_register_info->wake_enable, &gpe_register_info->enable_address); if (ACPI_FAILURE (status)) { return (status); } /* Point to next GPE register */ gpe_register_info++; } return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_hw_prepare_gpes_for_sleep * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Disable all runtime GPEs, enable all wake GPEs. * Called with interrupts disabled. The interrupt handler also * modifies gpe_register_info->Enable, so it should not be * given the chance to run until after the runtime GPEs are * re-enabled. * ******************************************************************************/ acpi_status acpi_hw_prepare_gpes_for_sleep ( void) { acpi_status status; ACPI_FUNCTION_ENTRY (); status = acpi_ev_walk_gpe_list (acpi_hw_prepare_gpe_block_for_sleep); return (status); } /****************************************************************************** * * FUNCTION: acpi_hw_restore_gpe_block_on_wake * * PARAMETERS: gpe_xrupt_info - GPE Interrupt info * gpe_block - Gpe Block info * * RETURN: Status * * DESCRIPTION: Enable all runtime GPEs and disable all wake GPEs -- in one * GPE block * ******************************************************************************/ static acpi_status acpi_hw_restore_gpe_block_on_wake ( struct acpi_gpe_xrupt_info *gpe_xrupt_info, struct acpi_gpe_block_info *gpe_block) { u32 i; struct acpi_gpe_register_info *gpe_register_info; acpi_status status; /* This callback processes one entire GPE block */ /* Get the register info for the entire GPE block */ gpe_register_info = gpe_block->register_info; /* Examine each GPE register within the block */ for (i = 0; i < gpe_block->register_count; i++) { /* Clear the entire status register */ status = acpi_hw_low_level_write (8, 0xFF, &gpe_block->register_info[i].status_address); if (ACPI_FAILURE (status)) { return (status); } /* * Restore the GPE Enable register, which will do the following: * * 1) Disable all wakeup GPEs * 2) Enable all runtime GPEs * * (On sleep, we saved the enabled status of all GPEs) */ status = acpi_hw_low_level_write (8, gpe_register_info->enable, &gpe_register_info->enable_address); if (ACPI_FAILURE (status)) { return (status); } /* Point to next GPE register */ gpe_register_info++; } return (AE_OK); } /****************************************************************************** * * FUNCTION: acpi_hw_restore_gpes_on_wake * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Enable all runtime GPEs and disable all wake GPEs -- in all * GPE blocks * ******************************************************************************/ acpi_status acpi_hw_restore_gpes_on_wake ( void) { acpi_status status; ACPI_FUNCTION_ENTRY (); status = acpi_ev_walk_gpe_list (acpi_hw_restore_gpe_block_on_wake); return (status); }
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