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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The ChromiumOS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef CONSOLE_UART_H
#define CONSOLE_UART_H
#include <rules.h>
#include <stdint.h>
/* Return the clock frequency UART uses as reference clock for
* baudrate generator. */
unsigned int uart_platform_refclk(void);
#if IS_ENABLED(CONFIG_UART_OVERRIDE_BAUDRATE)
/* Return the baudrate, define this in your platform when using the above
configuration. */
unsigned int get_uart_baudrate(void);
#else
static inline unsigned int get_uart_baudrate(void)
{
return CONFIG_TTYS0_BAUD;
}
#endif
/* Returns the divisor value for a given baudrate.
* The formula to satisfy is:
* refclk / divisor = baudrate * oversample
*/
unsigned int uart_baudrate_divisor(unsigned int baudrate,
unsigned int refclk, unsigned int oversample);
/* Returns the oversample divisor multiplied by any other divisors that act
* on the input clock
*/
unsigned int uart_input_clock_divider(void);
void uart_init(int idx);
void uart_tx_byte(int idx, unsigned char data);
void uart_tx_flush(int idx);
unsigned char uart_rx_byte(int idx);
uintptr_t uart_platform_base(int idx);
#if !defined(__ROMCC__)
static inline void *uart_platform_baseptr(int idx)
{
return (void *)uart_platform_base(idx);
}
void oxford_remap(unsigned int new_base);
#define __CONSOLE_SERIAL_ENABLE__ (IS_ENABLED(CONFIG_CONSOLE_SERIAL) && \
(ENV_BOOTBLOCK || ENV_ROMSTAGE || ENV_RAMSTAGE || ENV_VERSTAGE || \
ENV_POSTCAR || (ENV_SMM && IS_ENABLED(CONFIG_DEBUG_SMI))))
#if __CONSOLE_SERIAL_ENABLE__
static inline void __uart_init(void)
{
uart_init(CONFIG_UART_FOR_CONSOLE);
}
static inline void __uart_tx_byte(u8 data)
{
uart_tx_byte(CONFIG_UART_FOR_CONSOLE, data);
}
static inline void __uart_tx_flush(void)
{
uart_tx_flush(CONFIG_UART_FOR_CONSOLE);
}
#else
static inline void __uart_init(void) {}
static inline void __uart_tx_byte(u8 data) {}
static inline void __uart_tx_flush(void) {}
#endif
#if IS_ENABLED(CONFIG_GDB_STUB) && (ENV_ROMSTAGE || ENV_RAMSTAGE)
#define CONFIG_UART_FOR_GDB CONFIG_UART_FOR_CONSOLE
static inline void __gdb_hw_init(void) { uart_init(CONFIG_UART_FOR_GDB); }
static inline void __gdb_tx_byte(u8 data)
{
uart_tx_byte(CONFIG_UART_FOR_GDB, data);
}
static inline void __gdb_tx_flush(void) { uart_tx_flush(CONFIG_UART_FOR_GDB); }
static inline u8 __gdb_rx_byte(void)
{
return uart_rx_byte(CONFIG_UART_FOR_GDB);
}
#endif
#endif /* __ROMCC__ */
#endif /* CONSOLE_UART_H */
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