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Diffstat (limited to 'drivers/acpi/acpica/hwgpe.c')
-rw-r--r--drivers/acpi/acpica/hwgpe.c513
1 files changed, 513 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c
new file mode 100644
index 000000000..2d2e2e41a
--- /dev/null
+++ b/drivers/acpi/acpica/hwgpe.c
@@ -0,0 +1,513 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: hwgpe - Low level GPE enable/disable/clear functions
+ *
+ * Copyright (C) 2000 - 2018, 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_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_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);
+ }
+
+ /*lint -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_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_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_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_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_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_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);
+}
+
+/******************************************************************************
+ *
+ * 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);
+}
+
+#endif /* !ACPI_REDUCED_HARDWARE */
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