diff options
Diffstat (limited to 'drivers/acpi/hardware/hwregs.c')
| -rw-r--r-- | drivers/acpi/hardware/hwregs.c | 857 |
1 files changed, 857 insertions, 0 deletions
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c new file mode 100644 index 0000000..ddf792a --- /dev/null +++ b/drivers/acpi/hardware/hwregs.c @@ -0,0 +1,857 @@ + +/******************************************************************************* + * + * 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); +} |
