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/* Copyright 2017 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CROS_EC_CHIP_G_UART_BITBANG_H
#define __CROS_EC_CHIP_G_UART_BITBANG_H
/* UART Bit Banging */
#include "common.h"
#include "gpio.h"
#include "queue.h"
struct uart_bitbang_properties {
enum gpio_signal tx_gpio;
enum gpio_signal rx_gpio;
uint32_t tx_pinmux_reg;
uint32_t tx_pinmux_regval;
uint32_t rx_pinmux_reg;
uint32_t rx_pinmux_regval;
struct queue const *uart_in;
uint32_t baud_rate;
uint16_t rx_irq;
uint8_t uart;
uint8_t parity;
};
/* In order to bitbang a UART, a board must define a bitbang_config. */
extern struct uart_bitbang_properties bitbang_config;
/**
* Enable bit banging mode for a UART.
*
* The UART must have been configured first.
*/
int uart_bitbang_enable(void);
/**
* Disable bit banging mode for a UART.
*/
int uart_bitbang_disable(void);
/**
* Returns 1 if bit banging mode is enabled for the UART.
*/
int uart_bitbang_is_enabled(void);
/**
* Returns 1 if bit banging mode is wanted for the UART.
*/
int uart_bitbang_is_wanted(void);
/**
* Sample the RX line on a UART configured for bit banging mode.
*
* This is called when a falling edge is seen on the RX line and will attempt to
* receive a character. Incoming data with framing errors or parity errors will
* be discarded.
*/
void uart_bitbang_irq(void);
void uart_bitbang_drain_tx_queue(struct queue const *q);
#endif /* __CROS_EC_CHIP_G_UART_BITBANG_H */
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