mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2026-01-06 15:01:35 +00:00
9139071b71
When the AP or EC is off, the RX line is low. Holding the UART RX line low causes an interrupt storm. This change disables the UART TX and RX on the peripheral when the device is powered off so the interrupts wont be triggered. BUG=chrome-os-partner:53514,b:28885578 BRANCH=none TEST=run taskinfo on cr50 and make sure the IRQ count for 181 is a reasonable number. Change-Id: I42c779253860a2b1dd27ab41fb7097c887cc23ff Signed-off-by: Mary Ruthven <mruthven@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/347355
92 lines
1.8 KiB
C
92 lines
1.8 KiB
C
/* Copyright 2016 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.
|
|
*/
|
|
|
|
#ifndef __CROS_EC_UARTN_H
|
|
#define __CROS_EC_UARTN_H
|
|
|
|
#include "common.h"
|
|
|
|
/**
|
|
* Initialize the UART module.
|
|
*/
|
|
void uartn_init(int uart);
|
|
|
|
/**
|
|
* Flush the transmit FIFO.
|
|
*/
|
|
void uartn_tx_flush(int uart);
|
|
|
|
/**
|
|
* Return non-zero if there is room to transmit a character immediately.
|
|
*/
|
|
int uartn_tx_ready(int uart);
|
|
|
|
/**
|
|
* Return non-zero if a transmit is in progress.
|
|
*/
|
|
int uartn_tx_in_progress(int uart);
|
|
|
|
/*
|
|
* Return non-zero if the UART has a character available to read.
|
|
*/
|
|
int uartn_rx_available(int uart);
|
|
|
|
/**
|
|
* Send a character to the UART data register.
|
|
*
|
|
* If the transmit FIFO is full, blocks until there is space.
|
|
*
|
|
* @param c Character to send.
|
|
*/
|
|
void uartn_write_char(int uart, char c);
|
|
|
|
/**
|
|
* Read one char from the UART data register.
|
|
*
|
|
* @return The character read.
|
|
*/
|
|
int uartn_read_char(int uart);
|
|
|
|
/**
|
|
* Disable all UART related IRQs.
|
|
*
|
|
* Used to avoid concurrent accesses on UART management variables.
|
|
*/
|
|
void uartn_disable_interrupt(int uart);
|
|
|
|
/**
|
|
* Re-enable UART IRQs.
|
|
*/
|
|
void uartn_enable_interrupt(int uart);
|
|
|
|
/**
|
|
* Re-enable the UART transmit interrupt.
|
|
*
|
|
* This also forces triggering a UART interrupt, if the transmit interrupt was
|
|
* disabled.
|
|
*/
|
|
void uartn_tx_start(int uart);
|
|
|
|
/**
|
|
* Disable the UART transmit interrupt.
|
|
*/
|
|
void uartn_tx_stop(int uart);
|
|
|
|
/* Get UART output status */
|
|
int uartn_enabled(int uart);
|
|
|
|
/* Enable UART output */
|
|
void uartn_tx_connect(int uart);
|
|
|
|
/* Disable UART output */
|
|
void uartn_tx_disconnect(int uart);
|
|
|
|
/* Enable TX and RX. Disable HW flow control and loopback */
|
|
void uartn_enable(int uart);
|
|
|
|
/* Disable TX, RX, HW flow control, and loopback */
|
|
void uartn_disable(int uart);
|
|
#endif /* __CROS_EC_UARTN_H */
|