diff options
Diffstat (limited to 'drivers/acpi/hardware/hwregs.c')
| -rw-r--r-- | drivers/acpi/hardware/hwregs.c | 857 |
1 files changed, 0 insertions, 857 deletions
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c deleted file mode 100644 index ddf792adcf96..000000000000 --- a/drivers/acpi/hardware/hwregs.c +++ /dev/null @@ -1,857 +0,0 @@ - -/******************************************************************************* - * - * Module Name: hwregs - Read/write access functions for the various ACPI - * control and status registers. - * - ******************************************************************************/ - -/* - * Copyright (C) 2000 - 2008, Intel Corp. - * 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/acnamesp.h> -#include <acpi/acevents.h> - -#define _COMPONENT ACPI_HARDWARE -ACPI_MODULE_NAME("hwregs") - -/******************************************************************************* - * - * FUNCTION: acpi_hw_clear_acpi_status - * - * PARAMETERS: None - * - * RETURN: None - * - * DESCRIPTION: Clears all fixed and general purpose status bits - * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED - * - ******************************************************************************/ -acpi_status acpi_hw_clear_acpi_status(void) -{ - acpi_status status; - acpi_cpu_flags lock_flags = 0; - - ACPI_FUNCTION_TRACE(hw_clear_acpi_status); - - ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n", - ACPI_BITMASK_ALL_FIXED_STATUS, - (u16) acpi_gbl_FADT.xpm1a_event_block.address)); - - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); - - status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, - ACPI_BITMASK_ALL_FIXED_STATUS); - if (ACPI_FAILURE(status)) { - goto unlock_and_exit; - } - - /* Clear the fixed events */ - - if (acpi_gbl_FADT.xpm1b_event_block.address) { - status = - acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS, - &acpi_gbl_FADT.xpm1b_event_block); - if (ACPI_FAILURE(status)) { - goto unlock_and_exit; - } - } - - /* Clear the GPE Bits in all GPE registers in all GPE blocks */ - - status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block); - - unlock_and_exit: - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); - return_ACPI_STATUS(status); -} - -/******************************************************************************* - * - * FUNCTION: acpi_get_sleep_type_data - * - * PARAMETERS: sleep_state - Numeric sleep state - * *sleep_type_a - Where SLP_TYPa is returned - * *sleep_type_b - Where SLP_TYPb is returned - * - * RETURN: Status - ACPI status - * - * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep - * state. - * - ******************************************************************************/ - -acpi_status -acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b) -{ - acpi_status status = AE_OK; - struct acpi_evaluate_info *info; - - ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data); - - /* Validate parameters */ - - if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { - return_ACPI_STATUS(AE_BAD_PARAMETER); - } - - /* Allocate the evaluation information block */ - - info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); - if (!info) { - return_ACPI_STATUS(AE_NO_MEMORY); - } - - info->pathname = - ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]); - - /* Evaluate the namespace object containing the values for this state */ - - status = acpi_ns_evaluate(info); - if (ACPI_FAILURE(status)) { - ACPI_DEBUG_PRINT((ACPI_DB_EXEC, - "%s while evaluating SleepState [%s]\n", - acpi_format_exception(status), - info->pathname)); - - goto cleanup; - } - - /* Must have a return object */ - - if (!info->return_object) { - ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]", - info->pathname)); - status = AE_NOT_EXIST; - } - - /* It must be of type Package */ - - else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) { - ACPI_ERROR((AE_INFO, - "Sleep State return object is not a Package")); - status = AE_AML_OPERAND_TYPE; - } - - /* - * The package must have at least two elements. NOTE (March 2005): This - * goes against the current ACPI spec which defines this object as a - * package with one encoded DWORD element. However, existing practice - * by BIOS vendors seems to be to have 2 or more elements, at least - * one per sleep type (A/B). - */ - else if (info->return_object->package.count < 2) { - ACPI_ERROR((AE_INFO, - "Sleep State return package does not have at least two elements")); - status = AE_AML_NO_OPERAND; - } - - /* The first two elements must both be of type Integer */ - - else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0]) - != ACPI_TYPE_INTEGER) || - (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1]) - != ACPI_TYPE_INTEGER)) { - ACPI_ERROR((AE_INFO, - "Sleep State return package elements are not both Integers (%s, %s)", - acpi_ut_get_object_type_name(info->return_object-> - package.elements[0]), - acpi_ut_get_object_type_name(info->return_object-> - package.elements[1]))); - status = AE_AML_OPERAND_TYPE; - } else { - /* Valid _Sx_ package size, type, and value */ - - *sleep_type_a = (u8) - (info->return_object->package.elements[0])->integer.value; - *sleep_type_b = (u8) - (info->return_object->package.elements[1])->integer.value; - } - - if (ACPI_FAILURE(status)) { - ACPI_EXCEPTION((AE_INFO, status, - "While evaluating SleepState [%s], bad Sleep object %p type %s", - info->pathname, info->return_object, - acpi_ut_get_object_type_name(info-> - return_object))); - } - - acpi_ut_remove_reference(info->return_object); - - cleanup: - ACPI_FREE(info); - return_ACPI_STATUS(status); -} - -ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data) - -/******************************************************************************* - * - * FUNCTION: acpi_hw_get_register_bit_mask - * - * PARAMETERS: register_id - Index of ACPI Register to access - * - * RETURN: The bitmask to be used when accessing the register - * - * DESCRIPTION: Map register_id into a register bitmask. - * - ******************************************************************************/ -struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id) -{ - ACPI_FUNCTION_ENTRY(); - - if (register_id > ACPI_BITREG_MAX) { - ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X", - register_id)); - return (NULL); - } - - return (&acpi_gbl_bit_register_info[register_id]); -} - -/******************************************************************************* - * - * FUNCTION: acpi_get_register - * - * PARAMETERS: register_id - ID of ACPI bit_register to access - * return_value - Value that was read from the register - * - * RETURN: Status and the value read from specified Register. Value - * returned is normalized to bit0 (is shifted all the way right) - * - * DESCRIPTION: ACPI bit_register read function. - * - ******************************************************************************/ - -acpi_status acpi_get_register_unlocked(u32 register_id, u32 * return_value) -{ - u32 register_value = 0; - struct acpi_bit_register_info *bit_reg_info; - acpi_status status; - - ACPI_FUNCTION_TRACE(acpi_get_register); - - /* Get the info structure corresponding to the requested ACPI Register */ - - bit_reg_info = acpi_hw_get_bit_register_info(register_id); - if (!bit_reg_info) { - return_ACPI_STATUS(AE_BAD_PARAMETER); - } - - /* Read from the register */ - - status = acpi_hw_register_read(bit_reg_info->parent_register, - ®ister_value); - - if (ACPI_SUCCESS(status)) { - - /* Normalize the value that was read */ - - register_value = - ((register_value & bit_reg_info->access_bit_mask) - >> bit_reg_info->bit_position); - - *return_value = register_value; - - ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n", - register_value, - bit_reg_info->parent_register)); - } - - return_ACPI_STATUS(status); -} - -acpi_status acpi_get_register(u32 register_id, u32 * return_value) -{ - acpi_status status; - acpi_cpu_flags flags; - flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); - status = acpi_get_register_unlocked(register_id, return_value); - acpi_os_release_lock(acpi_gbl_hardware_lock, flags); - return status; -} - -ACPI_EXPORT_SYMBOL(acpi_get_register) - -/******************************************************************************* - * - * FUNCTION: acpi_set_register - * - * PARAMETERS: register_id - ID of ACPI bit_register to access - * Value - (only used on write) value to write to the - * Register, NOT pre-normalized to the bit pos - * - * RETURN: Status - * - * DESCRIPTION: ACPI Bit Register write function. - * - ******************************************************************************/ -acpi_status acpi_set_register(u32 register_id, u32 value) -{ - u32 register_value = 0; - struct acpi_bit_register_info *bit_reg_info; - acpi_status status; - acpi_cpu_flags lock_flags; - - ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id); - - /* Get the info structure corresponding to the requested ACPI Register */ - - bit_reg_info = acpi_hw_get_bit_register_info(register_id); - if (!bit_reg_info) { - ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X", - register_id)); - return_ACPI_STATUS(AE_BAD_PARAMETER); - } - - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); - - /* Always do a register read first so we can insert the new bits */ - - status = acpi_hw_register_read(bit_reg_info->parent_register, - ®ister_value); - if (ACPI_FAILURE(status)) { - goto unlock_and_exit; - } - - /* - * Decode the Register ID - * Register ID = [Register block ID] | [bit ID] - * - * Check bit ID to fine locate Register offset. - * Check Mask to determine Register offset, and then read-write. - */ - switch (bit_reg_info->parent_register) { - case ACPI_REGISTER_PM1_STATUS: - - /* - * Status Registers are different from the rest. Clear by - * writing 1, and writing 0 has no effect. So, the only relevant - * information is the single bit we're interested in, all others should - * be written as 0 so they will be left unchanged. - */ - value = ACPI_REGISTER_PREPARE_BITS(value, - bit_reg_info->bit_position, - bit_reg_info-> - access_bit_mask); - if (value) { - status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, - (u16) value); - register_value = 0; - } - break; - - case ACPI_REGISTER_PM1_ENABLE: - - ACPI_REGISTER_INSERT_VALUE(register_value, - bit_reg_info->bit_position, - bit_reg_info->access_bit_mask, - value); - - status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE, - (u16) register_value); - break; - - case ACPI_REGISTER_PM1_CONTROL: - - /* - * Write the PM1 Control register. - * Note that at this level, the fact that there are actually TWO - * registers (A and B - and B may not exist) is abstracted. - */ - ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n", - register_value)); - - ACPI_REGISTER_INSERT_VALUE(register_value, - bit_reg_info->bit_position, - bit_reg_info->access_bit_mask, - value); - - status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL, - (u16) register_value); - break; - - case ACPI_REGISTER_PM2_CONTROL: - - status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL, - ®ister_value); - if (ACPI_FAILURE(status)) { - goto unlock_and_exit; - } - - ACPI_DEBUG_PRINT((ACPI_DB_IO, - "PM2 control: Read %X from %8.8X%8.8X\n", - register_value, - ACPI_FORMAT_UINT64(acpi_gbl_FADT. - xpm2_control_block. - address))); - - ACPI_REGISTER_INSERT_VALUE(register_value, - bit_reg_info->bit_position, - bit_reg_info->access_bit_mask, - value); - - ACPI_DEBUG_PRINT((ACPI_DB_IO, - "About to write %4.4X to %8.8X%8.8X\n", - register_value, - ACPI_FORMAT_UINT64(acpi_gbl_FADT. - xpm2_control_block. - address))); - - status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL, - (u8) (register_value)); - break; - - default: - break; - } - - unlock_and_exit: - - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); - - /* Normalize the value that was read */ - - ACPI_DEBUG_EXEC(register_value = - ((register_value & bit_reg_info->access_bit_mask) >> - bit_reg_info->bit_position)); - - ACPI_DEBUG_PRINT((ACPI_DB_IO, - "Set bits: %8.8X actual %8.8X register %X\n", value, - register_value, bit_reg_info->parent_register)); - return_ACPI_STATUS(status); -} - -ACPI_EXPORT_SYMBOL(acpi_set_register) - -/****************************************************************************** - * - * FUNCTION: acpi_hw_register_read - * - * PARAMETERS: register_id - ACPI Register ID - * return_value - Where the register value is returned - * - * RETURN: Status and the value read. - * - * DESCRIPTION: Read from the specified ACPI register - * - ******************************************************************************/ -acpi_status -acpi_hw_register_read(u32 register_id, u32 * return_value) -{ - u32 value1 = 0; - u32 value2 = 0; - acpi_status status; - - ACPI_FUNCTION_TRACE(hw_register_read); - - switch (register_id) { - case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ - - status = - acpi_hw_low_level_read(16, &value1, - &acpi_gbl_FADT.xpm1a_event_block); - if (ACPI_FAILURE(status)) { - goto exit; - } - - /* PM1B is optional */ - - status = - acpi_hw_low_level_read(16, &value2, - &acpi_gbl_FADT.xpm1b_event_block); - value1 |= value2; - break; - - case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ - - status = - acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable); - if (ACPI_FAILURE(status)) { - goto exit; - } - - /* PM1B is optional */ - - status = - acpi_hw_low_level_read(16, &value2, &acpi_gbl_xpm1b_enable); - value1 |= value2; - break; - - case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ - - status = - acpi_hw_low_level_read(16, &value1, - &acpi_gbl_FADT.xpm1a_control_block); - if (ACPI_FAILURE(status)) { - goto exit; - } - - status = - acpi_hw_low_level_read(16, &value2, - &acpi_gbl_FADT.xpm1b_control_block); - value1 |= value2; - break; - - case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ - - status = - acpi_hw_low_level_read(8, &value1, - &acpi_gbl_FADT.xpm2_control_block); - break; - - case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ - - status = - acpi_hw_low_level_read(32, &value1, - &acpi_gbl_FADT.xpm_timer_block); - break; - - case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ - - status = - acpi_os_read_port(acpi_gbl_FADT.smi_command, &value1, 8); - break; - - default: - ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id)); - status = AE_BAD_PARAMETER; - break; - } - - exit: - - if (ACPI_SUCCESS(status)) { - *return_value = value1; - } - - return_ACPI_STATUS(status); -} - -/****************************************************************************** - * - * FUNCTION: acpi_hw_register_write - * - * PARAMETERS: register_id - ACPI Register ID - * Value - The value to write - * - * RETURN: Status - * - * DESCRIPTION: Write to the specified ACPI register - * - * NOTE: In accordance with the ACPI specification, this function automatically - * preserves the value of the following bits, meaning that these bits cannot be - * changed via this interface: - * - * PM1_CONTROL[0] = SCI_EN - * PM1_CONTROL[9] - * PM1_STATUS[11] - * - * ACPI References: - * 1) Hardware Ignored Bits: When software writes to a register with ignored - * bit fields, it preserves the ignored bit fields - * 2) SCI_EN: OSPM always preserves this bit position - * - ******************************************************************************/ - -acpi_status acpi_hw_register_write(u32 register_id, u32 value) -{ - acpi_status status; - u32 read_value; - - ACPI_FUNCTION_TRACE(hw_register_write); - - switch (register_id) { - case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ - - /* Perform a read first to preserve certain bits (per ACPI spec) */ - - status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, - &read_value); - if (ACPI_FAILURE(status)) { - goto exit; - } - - /* Insert the bits to be preserved */ - - ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS, - read_value); - - /* Now we can write the data */ - - status = - acpi_hw_low_level_write(16, value, - &acpi_gbl_FADT.xpm1a_event_block); - if (ACPI_FAILURE(status)) { - goto exit; - } - - /* PM1B is optional */ - - status = - acpi_hw_low_level_write(16, value, - &acpi_gbl_FADT.xpm1b_event_block); - break; - - case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ - - status = - acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable); - if (ACPI_FAILURE(status)) { - goto exit; - } - - /* PM1B is optional */ - - status = - acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1b_enable); - break; - - case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ - - /* - * Perform a read first to preserve certain bits (per ACPI spec) - */ - status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, - &read_value); - if (ACPI_FAILURE(status)) { - goto exit; - } - - /* Insert the bits to be preserved */ - - ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS, - read_value); - - /* Now we can write the data */ - - status = - acpi_hw_low_level_write(16, value, - &acpi_gbl_FADT.xpm1a_control_block); - if (ACPI_FAILURE(status)) { - goto exit; - } - - status = - acpi_hw_low_level_write(16, value, - &acpi_gbl_FADT.xpm1b_control_block); - break; - - case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */ - - status = - acpi_hw_low_level_write(16, value, - &acpi_gbl_FADT.xpm1a_control_block); - break; - - case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */ - - status = - acpi_hw_low_level_write(16, value, - &acpi_gbl_FADT.xpm1b_control_block); - break; - - case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ - - status = - acpi_hw_low_level_write(8, value, - &acpi_gbl_FADT.xpm2_control_block); - break; - - case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ - - status = - acpi_hw_low_level_write(32, value, - &acpi_gbl_FADT.xpm_timer_block); - break; - - case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ - - /* SMI_CMD is currently always in IO space */ - - status = - acpi_os_write_port(acpi_gbl_FADT.smi_command, value, 8); - break; - - default: - status = AE_BAD_PARAMETER; - break; - } - - exit: - return_ACPI_STATUS(status); -} - -/****************************************************************************** - * - * FUNCTION: acpi_hw_low_level_read - * - * PARAMETERS: Width - 8, 16, or 32 - * Value - Where the value is returned - * Reg - GAS register structure - * - * RETURN: Status - * - * DESCRIPTION: Read from either memory or IO space. - * - ******************************************************************************/ - -acpi_status -acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg) -{ - u64 address; - acpi_status status; - - ACPI_FUNCTION_NAME(hw_low_level_read); - - /* - * Must have a valid pointer to a GAS structure, and - * a non-zero address within. However, don't return an error - * because the PM1A/B code must not fail if B isn't present. - */ - if (!reg) { - return (AE_OK); - } - - /* Get a local copy of the address. Handles possible alignment issues */ - - ACPI_MOVE_64_TO_64(&address, ®->address); - if (!address) { - return (AE_OK); - } - *value = 0; - - /* - * Two address spaces supported: Memory or IO. - * PCI_Config is not supported here because the GAS struct is insufficient - */ - switch (reg->space_id) { - case ACPI_ADR_SPACE_SYSTEM_MEMORY: - - status = acpi_os_read_memory((acpi_physical_address) address, - value, width); - break; - - case ACPI_ADR_SPACE_SYSTEM_IO: - - status = - acpi_os_read_port((acpi_io_address) address, value, width); - break; - - default: - ACPI_ERROR((AE_INFO, - "Unsupported address space: %X", reg->space_id)); - return (AE_BAD_PARAMETER); - } - - ACPI_DEBUG_PRINT((ACPI_DB_IO, - "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n", - *value, width, ACPI_FORMAT_UINT64(address), - acpi_ut_get_region_name(reg->space_id))); - - return (status); -} - -/****************************************************************************** - * - * FUNCTION: acpi_hw_low_level_write - * - * PARAMETERS: Width - 8, 16, or 32 - * Value - To be written - * Reg - GAS register structure - * - * RETURN: Status - * - * DESCRIPTION: Write to either memory or IO space. - * - ******************************************************************************/ - -acpi_status -acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg) -{ - u64 address; - acpi_status status; - - ACPI_FUNCTION_NAME(hw_low_level_write); - - /* - * Must have a valid pointer to a GAS structure, and - * a non-zero address within. However, don't return an error - * because the PM1A/B code must not fail if B isn't present. - */ - if (!reg) { - return (AE_OK); - } - - /* Get a local copy of the address. Handles possible alignment issues */ - - ACPI_MOVE_64_TO_64(&address, ®->address); - if (!address) { - return (AE_OK); - } - - /* - * Two address spaces supported: Memory or IO. - * PCI_Config is not supported here because the GAS struct is insufficient - */ - switch (reg->space_id) { - case ACPI_ADR_SPACE_SYSTEM_MEMORY: - - status = acpi_os_write_memory((acpi_physical_address) address, - value, width); - break; - - case ACPI_ADR_SPACE_SYSTEM_IO: - - status = acpi_os_write_port((acpi_io_address) address, value, - width); - break; - - default: - ACPI_ERROR((AE_INFO, - "Unsupported address space: %X", reg->space_id)); - return (AE_BAD_PARAMETER); - } - - ACPI_DEBUG_PRINT((ACPI_DB_IO, - "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n", - value, width, ACPI_FORMAT_UINT64(address), - acpi_ut_get_region_name(reg->space_id))); - - return (status); -} |