From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/acpi/acpica/hwxface.c | 448 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 448 insertions(+) create mode 100644 drivers/acpi/acpica/hwxface.c (limited to 'drivers/acpi/acpica/hwxface.c') diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c new file mode 100644 index 000000000..6e39a771a --- /dev/null +++ b/drivers/acpi/acpica/hwxface.c @@ -0,0 +1,448 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: hwxface - Public ACPICA hardware interfaces + * + * Copyright (C) 2000 - 2018, Intel Corp. + * + *****************************************************************************/ + +#define EXPORT_ACPI_INTERFACES + +#include +#include "accommon.h" +#include "acnamesp.h" + +#define _COMPONENT ACPI_HARDWARE +ACPI_MODULE_NAME("hwxface") + +/****************************************************************************** + * + * FUNCTION: acpi_reset + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Set reset register in memory or IO space. Note: Does not + * support reset register in PCI config space, this must be + * handled separately. + * + ******************************************************************************/ +acpi_status acpi_reset(void) +{ + struct acpi_generic_address *reset_reg; + acpi_status status; + + ACPI_FUNCTION_TRACE(acpi_reset); + + reset_reg = &acpi_gbl_FADT.reset_register; + + /* Check if the reset register is supported */ + + if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) || + !reset_reg->address) { + return_ACPI_STATUS(AE_NOT_EXIST); + } + + if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { + /* + * For I/O space, write directly to the OSL. This bypasses the port + * validation mechanism, which may block a valid write to the reset + * register. + * + * NOTE: + * The ACPI spec requires the reset register width to be 8, so we + * hardcode it here and ignore the FADT value. This maintains + * compatibility with other ACPI implementations that have allowed + * BIOS code with bad register width values to go unnoticed. + */ + status = acpi_os_write_port((acpi_io_address)reset_reg->address, + acpi_gbl_FADT.reset_value, + ACPI_RESET_REGISTER_WIDTH); + } else { + /* Write the reset value to the reset register */ + + status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); + } + + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_reset) + +/****************************************************************************** + * + * FUNCTION: acpi_read + * + * PARAMETERS: value - Where the value is returned + * reg - GAS register structure + * + * RETURN: Status + * + * DESCRIPTION: Read from either memory or IO space. + * + * LIMITATIONS: + * bit_width must be exactly 8, 16, 32, or 64. + * space_ID must be system_memory or system_IO. + * bit_offset and access_width are currently ignored, as there has + * not been a need to implement these. + * + ******************************************************************************/ +acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg) +{ + acpi_status status; + + ACPI_FUNCTION_NAME(acpi_read); + + status = acpi_hw_read(return_value, reg); + return (status); +} + +ACPI_EXPORT_SYMBOL(acpi_read) + +/****************************************************************************** + * + * FUNCTION: acpi_write + * + * PARAMETERS: value - Value to be written + * reg - GAS register structure + * + * RETURN: Status + * + * DESCRIPTION: Write to either memory or IO space. + * + ******************************************************************************/ +acpi_status acpi_write(u64 value, struct acpi_generic_address *reg) +{ + acpi_status status; + + ACPI_FUNCTION_NAME(acpi_write); + + status = acpi_hw_write(value, reg); + return (status); +} + +ACPI_EXPORT_SYMBOL(acpi_write) + +#if (!ACPI_REDUCED_HARDWARE) +/******************************************************************************* + * + * FUNCTION: acpi_read_bit_register + * + * PARAMETERS: register_id - ID of ACPI Bit Register to access + * return_value - Value that was read from the register, + * normalized to bit position zero. + * + * RETURN: Status and the value read from the specified Register. Value + * returned is normalized to bit0 (is shifted all the way right) + * + * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock. + * + * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and + * PM2 Control. + * + * Note: The hardware lock is not required when reading the ACPI bit registers + * since almost all of them are single bit and it does not matter that + * the parent hardware register can be split across two physical + * registers. The only multi-bit field is SLP_TYP in the PM1 control + * register, but this field does not cross an 8-bit boundary (nor does + * it make much sense to actually read this field.) + * + ******************************************************************************/ +acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value) +{ + struct acpi_bit_register_info *bit_reg_info; + u32 register_value; + u32 value; + acpi_status status; + + ACPI_FUNCTION_TRACE_U32(acpi_read_bit_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) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* Read the entire parent register */ + + status = acpi_hw_register_read(bit_reg_info->parent_register, + ®ister_value); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Normalize the value that was read, mask off other bits */ + + value = ((register_value & bit_reg_info->access_bit_mask) + >> bit_reg_info->bit_position); + + ACPI_DEBUG_PRINT((ACPI_DB_IO, + "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n", + register_id, bit_reg_info->parent_register, + register_value, value)); + + *return_value = value; + return_ACPI_STATUS(AE_OK); +} + +ACPI_EXPORT_SYMBOL(acpi_read_bit_register) + +/******************************************************************************* + * + * FUNCTION: acpi_write_bit_register + * + * PARAMETERS: register_id - ID of ACPI Bit Register to access + * value - Value to write to the register, in bit + * position zero. The bit is automatically + * shifted to the correct position. + * + * RETURN: Status + * + * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock + * since most operations require a read/modify/write sequence. + * + * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and + * PM2 Control. + * + * Note that at this level, the fact that there may be actually two + * hardware registers (A and B - and B may not exist) is abstracted. + * + ******************************************************************************/ +acpi_status acpi_write_bit_register(u32 register_id, u32 value) +{ + struct acpi_bit_register_info *bit_reg_info; + acpi_cpu_flags lock_flags; + u32 register_value; + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE_U32(acpi_write_bit_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) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + lock_flags = acpi_os_acquire_raw_lock(acpi_gbl_hardware_lock); + + /* + * At this point, we know that the parent register is one of the + * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control + */ + if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) { + /* + * 1) Case for PM1 Enable, PM1 Control, and PM2 Control + * + * Perform a register read to preserve the bits that we are not + * interested in + */ + status = acpi_hw_register_read(bit_reg_info->parent_register, + ®ister_value); + if (ACPI_FAILURE(status)) { + goto unlock_and_exit; + } + + /* + * Insert the input bit into the value that was just read + * and write the register + */ + ACPI_REGISTER_INSERT_VALUE(register_value, + bit_reg_info->bit_position, + bit_reg_info->access_bit_mask, + value); + + status = acpi_hw_register_write(bit_reg_info->parent_register, + register_value); + } else { + /* + * 2) Case for PM1 Status + * + * The Status register is different from the rest. Clear an event + * by writing 1, 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. + */ + register_value = ACPI_REGISTER_PREPARE_BITS(value, + bit_reg_info-> + bit_position, + bit_reg_info-> + access_bit_mask); + + /* No need to write the register if value is all zeros */ + + if (register_value) { + status = + acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, + register_value); + } + } + + ACPI_DEBUG_PRINT((ACPI_DB_IO, + "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n", + register_id, bit_reg_info->parent_register, value, + register_value)); + +unlock_and_exit: + + acpi_os_release_raw_lock(acpi_gbl_hardware_lock, lock_flags); + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_write_bit_register) +#endif /* !ACPI_REDUCED_HARDWARE */ +/******************************************************************************* + * + * 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 + * + * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested + * sleep state via the appropriate \_Sx object. + * + * The sleep state package returned from the corresponding \_Sx_ object + * must contain at least one integer. + * + * March 2005: + * Added support for a package that contains two integers. This + * goes against the ACPI specification which defines this object as a + * package with one encoded DWORD integer. However, existing practice + * by many BIOS vendors is to return a package with 2 or more integer + * elements, at least one per sleep type (A/B). + * + * January 2013: + * Therefore, we must be prepared to accept a package with either a + * single integer or multiple integers. + * + * The single integer DWORD format is as follows: + * BYTE 0 - Value for the PM1A SLP_TYP register + * BYTE 1 - Value for the PM1B SLP_TYP register + * BYTE 2-3 - Reserved + * + * The dual integer format is as follows: + * Integer 0 - Value for the PM1A SLP_TYP register + * Integer 1 - Value for the PM1A SLP_TYP register + * + ******************************************************************************/ +acpi_status +acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b) +{ + acpi_status status; + struct acpi_evaluate_info *info; + union acpi_operand_object **elements; + + 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); + } + + /* + * Evaluate the \_Sx namespace object containing the register values + * for this state + */ + info->relative_pathname = acpi_gbl_sleep_state_names[sleep_state]; + + status = acpi_ns_evaluate(info); + if (ACPI_FAILURE(status)) { + if (status == AE_NOT_FOUND) { + + /* The _Sx states are optional, ignore NOT_FOUND */ + + goto final_cleanup; + } + + goto warning_cleanup; + } + + /* Must have a return object */ + + if (!info->return_object) { + ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]", + info->relative_pathname)); + status = AE_AML_NO_RETURN_VALUE; + goto warning_cleanup; + } + + /* Return object must be of type Package */ + + if (info->return_object->common.type != ACPI_TYPE_PACKAGE) { + ACPI_ERROR((AE_INFO, + "Sleep State return object is not a Package")); + status = AE_AML_OPERAND_TYPE; + goto return_value_cleanup; + } + + /* + * Any warnings about the package length or the object types have + * already been issued by the predefined name module -- there is no + * need to repeat them here. + */ + elements = info->return_object->package.elements; + switch (info->return_object->package.count) { + case 0: + + status = AE_AML_PACKAGE_LIMIT; + break; + + case 1: + + if (elements[0]->common.type != ACPI_TYPE_INTEGER) { + status = AE_AML_OPERAND_TYPE; + break; + } + + /* A valid _Sx_ package with one integer */ + + *sleep_type_a = (u8)elements[0]->integer.value; + *sleep_type_b = (u8)(elements[0]->integer.value >> 8); + break; + + case 2: + default: + + if ((elements[0]->common.type != ACPI_TYPE_INTEGER) || + (elements[1]->common.type != ACPI_TYPE_INTEGER)) { + status = AE_AML_OPERAND_TYPE; + break; + } + + /* A valid _Sx_ package with two integers */ + + *sleep_type_a = (u8)elements[0]->integer.value; + *sleep_type_b = (u8)elements[1]->integer.value; + break; + } + +return_value_cleanup: + acpi_ut_remove_reference(info->return_object); + +warning_cleanup: + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "While evaluating Sleep State [%s]", + info->relative_pathname)); + } + +final_cleanup: + ACPI_FREE(info); + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data) -- cgit v1.2.3