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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* LPC module for Chrome EC */
#ifndef __CROS_EC_LPC_H
#define __CROS_EC_LPC_H
#include "common.h"
#include "host_command.h"
/**
* Return a pointer to the memory-mapped buffer.
*
* This buffer is writable at any time, and the host can read it at any time.
*/
uint8_t *lpc_get_memmap_range(void);
/**
* Return true if keyboard data is waiting for the host to read (TOH is still
* set).
*/
int lpc_keyboard_has_char(void);
/* Return true if the FRMH is still set */
int lpc_keyboard_input_pending(void);
/**
* Send a byte to host via keyboard port 0x60.
*
* @param chr Byte to send
* @param send_irq If non-zero, asserts IRQ
*/
void lpc_keyboard_put_char(uint8_t chr, int send_irq);
/**
* Clear the keyboard buffer.
*/
void lpc_keyboard_clear_buffer(void);
/**
* Send an IRQ to host if there is a byte in buffer already.
*/
void lpc_keyboard_resume_irq(void);
/**
* Return non-zero if the COMx interface has received a character.
*/
int lpc_comx_has_char(void);
/**
* Return the next character pending on the COMx interface.
*/
int lpc_comx_get_char(void);
/**
* Put a character to the COMx LPC interface.
*/
void lpc_comx_put_char(int c);
/*
* Low-level LPC interface for host events.
*
* For use by host_event_commands.c. Other modules should use the methods
* provided in host_command.h.
*/
/* Types of host events */
enum lpc_host_event_type {
LPC_HOST_EVENT_SMI = 0,
LPC_HOST_EVENT_SCI,
LPC_HOST_EVENT_WAKE,
LPC_HOST_EVENT_ALWAYS_REPORT,
LPC_HOST_EVENT_COUNT,
};
/**
* Get current state of host events.
*/
host_event_t lpc_get_host_events(void);
/**
* Get host events that are set based on the type provided.
*
* @param type Event type
*/
host_event_t lpc_get_host_events_by_type(enum lpc_host_event_type type);
/**
* Set the event mask for the specified event type.
*
* @param type Event type
* @param mask New event mask
*/
void lpc_set_host_event_mask(enum lpc_host_event_type type, host_event_t mask);
/**
* Get host event mask based on the type provided.
*
* @param type Event type
*/
host_event_t lpc_get_host_event_mask(enum lpc_host_event_type type);
/**
* Clear and return the lowest host event.
*/
int lpc_get_next_host_event(void);
/**
* Set the EC_LPC_STATUS_* mask for the specified status.
*/
void lpc_set_acpi_status_mask(uint8_t mask);
/**
* Clear the EC_LPC_STATUS_* mask for the specified status.
*/
void lpc_clear_acpi_status_mask(uint8_t mask);
/**
* Return the state of platform reset.
*
* @return non-zero if PLTRST# is asserted (low); 0 if not asserted (high).
*/
int lpc_get_pltrst_asserted(void);
/* Disable LPC ACPI interrupts */
void lpc_disable_acpi_interrupts(void);
/* Enable LPC ACPI interrupts */
void lpc_enable_acpi_interrupts(void);
/**
* Update host event status. This function is called whenever host event bits
* need to be updated based on initialization complete or host event mask
* update or when a new host event is set or cleared.
*/
void lpc_update_host_event_status(void);
/*
* This is a weak function defined in host_events_commands.c to override the
* LPC_HOST_EVENT_ALWAYS_REPORT mask. It can be implemented by boards if there
* is a need to use custom mask.
*/
host_event_t lpc_override_always_report_mask(void);
/* Initialize LPC masks. */
void lpc_init_mask(void);
/*
* Clear LPC masks for SMI, SCI and wake upon resume from S3. This is done to
* mask these events until host unmasks them itself.
*/
void lpc_s3_resume_clear_masks(void);
#endif /* __CROS_EC_LPC_H */
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