diff options
Diffstat (limited to 'drivers/acpi/acpica/hwgpe.c')
| -rw-r--r-- | drivers/acpi/acpica/hwgpe.c | 683 |
1 files changed, 683 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c new file mode 100644 index 0000000000..e0c847ab83 --- /dev/null +++ b/drivers/acpi/acpica/hwgpe.c @@ -0,0 +1,683 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: hwgpe - Low level GPE enable/disable/clear functions + * + * Copyright (C) 2000 - 2023, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acevents.h" + +#define _COMPONENT ACPI_HARDWARE +ACPI_MODULE_NAME("hwgpe") +#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ +/* Local prototypes */ +static acpi_status +acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, + void *context); + +static acpi_status +acpi_hw_gpe_enable_write(u8 enable_mask, + struct acpi_gpe_register_info *gpe_register_info); + +/****************************************************************************** + * + * FUNCTION: acpi_hw_gpe_read + * + * PARAMETERS: value - Where the value is returned + * reg - GPE register structure + * + * RETURN: Status + * + * DESCRIPTION: Read from a GPE register in either memory or IO space. + * + * LIMITATIONS: <These limitations also apply to acpi_hw_gpe_write> + * space_ID must be system_memory or system_IO. + * + ******************************************************************************/ + +acpi_status acpi_hw_gpe_read(u64 *value, struct acpi_gpe_address *reg) +{ + acpi_status status; + u32 value32; + + if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { +#ifdef ACPI_GPE_USE_LOGICAL_ADDRESSES + *value = (u64)ACPI_GET8((unsigned long)reg->address); + return_ACPI_STATUS(AE_OK); +#else + return acpi_os_read_memory((acpi_physical_address)reg->address, + value, ACPI_GPE_REGISTER_WIDTH); +#endif + } + + status = acpi_os_read_port((acpi_io_address)reg->address, + &value32, ACPI_GPE_REGISTER_WIDTH); + if (ACPI_FAILURE(status)) + return_ACPI_STATUS(status); + + *value = (u64)value32; + + return_ACPI_STATUS(AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_gpe_write + * + * PARAMETERS: value - Value to be written + * reg - GPE register structure + * + * RETURN: Status + * + * DESCRIPTION: Write to a GPE register in either memory or IO space. + * + ******************************************************************************/ + +acpi_status acpi_hw_gpe_write(u64 value, struct acpi_gpe_address *reg) +{ + if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { +#ifdef ACPI_GPE_USE_LOGICAL_ADDRESSES + ACPI_SET8((unsigned long)reg->address, value); + return_ACPI_STATUS(AE_OK); +#else + return acpi_os_write_memory((acpi_physical_address)reg->address, + value, ACPI_GPE_REGISTER_WIDTH); +#endif + } + + return acpi_os_write_port((acpi_io_address)reg->address, (u32)value, + ACPI_GPE_REGISTER_WIDTH); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_get_gpe_register_bit + * + * PARAMETERS: gpe_event_info - Info block for the GPE + * + * RETURN: Register mask with a one in the GPE bit position + * + * DESCRIPTION: Compute the register mask for this GPE. One bit is set in the + * correct position for the input GPE. + * + ******************************************************************************/ + +u32 acpi_hw_get_gpe_register_bit(struct acpi_gpe_event_info *gpe_event_info) +{ + + return ((u32)1 << + (gpe_event_info->gpe_number - + gpe_event_info->register_info->base_gpe_number)); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_low_set_gpe + * + * PARAMETERS: gpe_event_info - Info block for the GPE to be disabled + * action - Enable or disable + * + * RETURN: Status + * + * DESCRIPTION: Enable or disable a single GPE in the parent enable register. + * The enable_mask field of the involved GPE register must be + * updated by the caller if necessary. + * + ******************************************************************************/ + +acpi_status +acpi_hw_low_set_gpe(struct acpi_gpe_event_info *gpe_event_info, u32 action) +{ + struct acpi_gpe_register_info *gpe_register_info; + acpi_status status = AE_OK; + u64 enable_mask; + u32 register_bit; + + 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_NOT_EXIST); + } + + /* Get current value of the enable register that contains this GPE */ + + status = acpi_hw_gpe_read(&enable_mask, + &gpe_register_info->enable_address); + if (ACPI_FAILURE(status)) { + return (status); + } + + /* Set or clear just the bit that corresponds to this GPE */ + + register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); + switch (action) { + case ACPI_GPE_CONDITIONAL_ENABLE: + + /* Only enable if the corresponding enable_mask bit is set */ + + if (!(register_bit & gpe_register_info->enable_mask)) { + return (AE_BAD_PARAMETER); + } + + ACPI_FALLTHROUGH; + + case ACPI_GPE_ENABLE: + + ACPI_SET_BIT(enable_mask, register_bit); + break; + + case ACPI_GPE_DISABLE: + + ACPI_CLEAR_BIT(enable_mask, register_bit); + break; + + default: + + ACPI_ERROR((AE_INFO, "Invalid GPE Action, %u", action)); + return (AE_BAD_PARAMETER); + } + + if (!(register_bit & gpe_register_info->mask_for_run)) { + + /* Write the updated enable mask */ + + status = acpi_hw_gpe_write(enable_mask, + &gpe_register_info->enable_address); + } + return (status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_clear_gpe + * + * PARAMETERS: gpe_event_info - Info block for the GPE to be cleared + * + * RETURN: Status + * + * DESCRIPTION: Clear the status bit for a single GPE. + * + ******************************************************************************/ + +acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info *gpe_event_info) +{ + struct acpi_gpe_register_info *gpe_register_info; + acpi_status status; + u32 register_bit; + + 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_NOT_EXIST); + } + + /* + * Write a one to the appropriate bit in the status register to + * clear this GPE. + */ + register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); + + status = acpi_hw_gpe_write(register_bit, + &gpe_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) +{ + u64 in_byte; + u32 register_bit; + struct acpi_gpe_register_info *gpe_register_info; + acpi_event_status local_event_status = 0; + acpi_status status; + + ACPI_FUNCTION_ENTRY(); + + if (!event_status) { + return (AE_BAD_PARAMETER); + } + + /* GPE currently handled? */ + + if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) != + ACPI_GPE_DISPATCH_NONE) { + local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER; + } + + /* Get the info block for the entire GPE register */ + + gpe_register_info = gpe_event_info->register_info; + + /* Get the register bitmask for this GPE */ + + register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info); + + /* GPE currently enabled? (enabled for runtime?) */ + + if (register_bit & gpe_register_info->enable_for_run) { + local_event_status |= ACPI_EVENT_FLAG_ENABLED; + } + + /* GPE currently masked? (masked for runtime?) */ + + if (register_bit & gpe_register_info->mask_for_run) { + local_event_status |= ACPI_EVENT_FLAG_MASKED; + } + + /* GPE enabled for wake? */ + + if (register_bit & gpe_register_info->enable_for_wake) { + local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED; + } + + /* GPE currently enabled (enable bit == 1)? */ + + status = acpi_hw_gpe_read(&in_byte, &gpe_register_info->enable_address); + if (ACPI_FAILURE(status)) { + return (status); + } + + if (register_bit & in_byte) { + local_event_status |= ACPI_EVENT_FLAG_ENABLE_SET; + } + + /* GPE currently active (status bit == 1)? */ + + status = acpi_hw_gpe_read(&in_byte, &gpe_register_info->status_address); + if (ACPI_FAILURE(status)) { + return (status); + } + + if (register_bit & in_byte) { + local_event_status |= ACPI_EVENT_FLAG_STATUS_SET; + } + + /* Set return value */ + + (*event_status) = local_event_status; + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_gpe_enable_write + * + * PARAMETERS: enable_mask - Bit mask to write to the GPE register + * gpe_register_info - Gpe Register info + * + * RETURN: Status + * + * DESCRIPTION: Write the enable mask byte to the given GPE register. + * + ******************************************************************************/ + +static acpi_status +acpi_hw_gpe_enable_write(u8 enable_mask, + struct acpi_gpe_register_info *gpe_register_info) +{ + acpi_status status; + + gpe_register_info->enable_mask = enable_mask; + + status = acpi_hw_gpe_write(enable_mask, + &gpe_register_info->enable_address); + 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 single GPE block + * + ******************************************************************************/ + +acpi_status +acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, void *context) +{ + 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_gpe_enable_write(0x00, + &gpe_block->register_info[i]); + 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 single GPE block + * + ******************************************************************************/ + +acpi_status +acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, void *context) +{ + 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_gpe_write(0xFF, + &gpe_block->register_info[i].status_address); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_runtime_gpe_block + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * + * RETURN: Status + * + * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes + * combination wake/run GPEs. + * + ******************************************************************************/ + +acpi_status +acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, + void *context) +{ + u32 i; + acpi_status status; + struct acpi_gpe_register_info *gpe_register_info; + u8 enable_mask; + + /* NOTE: assumes that all GPEs are currently disabled */ + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + gpe_register_info = &gpe_block->register_info[i]; + if (!gpe_register_info->enable_for_run) { + continue; + } + + /* Enable all "runtime" GPEs in this register */ + + enable_mask = gpe_register_info->enable_for_run & + ~gpe_register_info->mask_for_run; + status = + acpi_hw_gpe_enable_write(enable_mask, gpe_register_info); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_wakeup_gpe_block + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * + * RETURN: Status + * + * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes + * combination wake/run GPEs. + * + ******************************************************************************/ + +static acpi_status +acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, + void *context) +{ + u32 i; + acpi_status status; + struct acpi_gpe_register_info *gpe_register_info; + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + gpe_register_info = &gpe_block->register_info[i]; + + /* + * Enable all "wake" GPEs in this register and disable the + * remaining ones. + */ + + status = + acpi_hw_gpe_enable_write(gpe_register_info->enable_for_wake, + gpe_register_info); + if (ACPI_FAILURE(status)) { + return (status); + } + } + + return (AE_OK); +} + +struct acpi_gpe_block_status_context { + struct acpi_gpe_register_info *gpe_skip_register_info; + u8 gpe_skip_mask; + u8 retval; +}; + +/****************************************************************************** + * + * FUNCTION: acpi_hw_get_gpe_block_status + * + * PARAMETERS: gpe_xrupt_info - GPE Interrupt info + * gpe_block - Gpe Block info + * context - GPE list walk context data + * + * RETURN: Success + * + * DESCRIPTION: Produce a combined GPE status bits mask for the given block. + * + ******************************************************************************/ + +static acpi_status +acpi_hw_get_gpe_block_status(struct acpi_gpe_xrupt_info *gpe_xrupt_info, + struct acpi_gpe_block_info *gpe_block, + void *context) +{ + struct acpi_gpe_block_status_context *c = context; + struct acpi_gpe_register_info *gpe_register_info; + u64 in_enable, in_status; + acpi_status status; + u8 ret_mask; + u32 i; + + /* Examine each GPE Register within the block */ + + for (i = 0; i < gpe_block->register_count; i++) { + gpe_register_info = &gpe_block->register_info[i]; + + status = acpi_hw_gpe_read(&in_enable, + &gpe_register_info->enable_address); + if (ACPI_FAILURE(status)) { + continue; + } + + status = acpi_hw_gpe_read(&in_status, + &gpe_register_info->status_address); + if (ACPI_FAILURE(status)) { + continue; + } + + ret_mask = in_enable & in_status; + if (ret_mask && c->gpe_skip_register_info == gpe_register_info) { + ret_mask &= ~c->gpe_skip_mask; + } + c->retval |= ret_mask; + } + + return (AE_OK); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_disable_all_gpes + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Disable and clear all GPEs in all GPE blocks + * + ******************************************************************************/ + +acpi_status acpi_hw_disable_all_gpes(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_disable_all_gpes); + + status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL); + return_ACPI_STATUS(status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_all_runtime_gpes + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks + * + ******************************************************************************/ + +acpi_status acpi_hw_enable_all_runtime_gpes(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes); + + status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block, NULL); + return_ACPI_STATUS(status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_enable_all_wakeup_gpes + * + * PARAMETERS: None + * + * RETURN: Status + * + * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks + * + ******************************************************************************/ + +acpi_status acpi_hw_enable_all_wakeup_gpes(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes); + + status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block, NULL); + return_ACPI_STATUS(status); +} + +/****************************************************************************** + * + * FUNCTION: acpi_hw_check_all_gpes + * + * PARAMETERS: gpe_skip_device - GPE devoce of the GPE to skip + * gpe_skip_number - Number of the GPE to skip + * + * RETURN: Combined status of all GPEs + * + * DESCRIPTION: Check all enabled GPEs in all GPE blocks, except for the one + * represented by the "skip" arguments, and return TRUE if the + * status bit is set for at least one of them of FALSE otherwise. + * + ******************************************************************************/ + +u8 acpi_hw_check_all_gpes(acpi_handle gpe_skip_device, u32 gpe_skip_number) +{ + struct acpi_gpe_block_status_context context = { + .gpe_skip_register_info = NULL, + .retval = 0, + }; + struct acpi_gpe_event_info *gpe_event_info; + acpi_cpu_flags flags; + + ACPI_FUNCTION_TRACE(acpi_hw_check_all_gpes); + + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); + + gpe_event_info = acpi_ev_get_gpe_event_info(gpe_skip_device, + gpe_skip_number); + if (gpe_event_info) { + context.gpe_skip_register_info = gpe_event_info->register_info; + context.gpe_skip_mask = acpi_hw_get_gpe_register_bit(gpe_event_info); + } + + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + + (void)acpi_ev_walk_gpe_list(acpi_hw_get_gpe_block_status, &context); + return (context.retval != 0); +} + +#endif /* !ACPI_REDUCED_HARDWARE */ |