cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/hwxface.c

/******************************************************************************
 *
 * Module Name: hwxface - Public ACPICA hardware interfaces
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, 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.
 */


#define EXPORT_ACPI_INTERFACES

#include <acpi/acpi.h>
#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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore9191.00%480.00%
Linus Torvalds99.00%120.00%
Total100100.00%5100.00%

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: <These limitations also apply to acpi_write> * 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) { u32 value_lo; u32 value_hi; u32 width; u64 address; acpi_status status; ACPI_FUNCTION_NAME(acpi_read); if (!return_value) { return (AE_BAD_PARAMETER); } /* Validate contents of the GAS register. Allow 64-bit transfers */ status = acpi_hw_validate_register(reg, 64, &address); if (ACPI_FAILURE(status)) { return (status); } /* * Two address spaces supported: Memory or I/O. PCI_Config is * not supported here because the GAS structure is insufficient */ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { status = acpi_os_read_memory((acpi_physical_address) address, return_value, reg->bit_width); if (ACPI_FAILURE(status)) { return (status); } } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ value_lo = 0; value_hi = 0; width = reg->bit_width; if (width == 64) { width = 32; /* Break into two 32-bit transfers */ } status = acpi_hw_read_port((acpi_io_address) address, &value_lo, width); if (ACPI_FAILURE(status)) { return (status); } if (reg->bit_width == 64) { /* Read the top 32 bits */ status = acpi_hw_read_port((acpi_io_address) (address + 4), &value_hi, 32); if (ACPI_FAILURE(status)) { return (status); } } /* Set the return value only if status is AE_OK */ *return_value = (value_lo | ((u64)value_hi << 32)); } ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n", ACPI_FORMAT_UINT64(*return_value), reg->bit_width, ACPI_FORMAT_UINT64(address), acpi_ut_get_region_name(reg->space_id))); return (AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore24791.14%583.33%
Björn Helgaas248.86%116.67%
Total271100.00%6100.00%

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) { u32 width; u64 address; acpi_status status; ACPI_FUNCTION_NAME(acpi_write); /* Validate contents of the GAS register. Allow 64-bit transfers */ status = acpi_hw_validate_register(reg, 64, &address); if (ACPI_FAILURE(status)) { return (status); } /* * Two address spaces supported: Memory or IO. PCI_Config is * not supported here because the GAS structure is insufficient */ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { status = acpi_os_write_memory((acpi_physical_address) address, value, reg->bit_width); if (ACPI_FAILURE(status)) { return (status); } } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ width = reg->bit_width; if (width == 64) { width = 32; /* Break into two 32-bit transfers */ } status = acpi_hw_write_port((acpi_io_address) address, ACPI_LODWORD(value), width); if (ACPI_FAILURE(status)) { return (status); } if (reg->bit_width == 64) { status = acpi_hw_write_port((acpi_io_address) (address + 4), ACPI_HIDWORD(value), 32); if (ACPI_FAILURE(status)) { return (status); } } } ACPI_DEBUG_PRINT((ACPI_DB_IO, "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n", ACPI_FORMAT_UINT64(value), reg->bit_width, ACPI_FORMAT_UINT64(address), acpi_ut_get_region_name(reg->space_id))); return (status); }

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Robert Moore229100.00%4100.00%
Total229100.00%4100.00%

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, &register_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); }

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Robert Moore126100.00%4100.00%
Total126100.00%4100.00%

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_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, &register_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_lock(acpi_gbl_hardware_lock, lock_flags); return_ACPI_STATUS(status); }

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Robert Moore192100.00%3100.00%
Total192100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Robert Moore37295.14%480.00%
Prarit Bhargava194.86%120.00%
Total391100.00%5100.00%

ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)

Overall Contributors

PersonTokensPropCommitsCommitProp
Robert Moore131095.62%1872.00%
Björn Helgaas241.75%14.00%
Prarit Bhargava191.39%14.00%
Linus Torvalds90.66%14.00%
Lv Zheng40.29%28.00%
Len Brown20.15%14.00%
Paul Gortmaker20.15%14.00%
Total1370100.00%25100.00%
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