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https://gitlab.rtems.org/rtems/rtos/rtems.git
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Sebastian Huber
de8ef0424c
In SMP systems, the interrupt handler may run concurrently with tasks trying to transmit. Properly protect the transmit state through the device lock. Simplify the transmit process. Close #5552. Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+-with-RTEMS-exception */
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/**
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* @file
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*
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*/
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/*
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* COPYRIGHT (c) 1998 by Radstone Technology
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*
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* THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY
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* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK
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* AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU.
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*
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* You are hereby granted permission to use, copy, modify, and distribute
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* this file, provided that this notice, plus the above copyright notice
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* and disclaimer, appears in all copies. Radstone Technology will provide
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* no support for this code.
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*
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* COPYRIGHT (c) 1989-2012.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifndef _NS16550_H_
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#define _NS16550_H_
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#include <rtems/termiostypes.h>
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#include <libchip/serial.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Driver function table
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*/
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extern const console_fns ns16550_fns;
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extern const console_fns ns16550_fns_polled;
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/*
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* Flow control function tables
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*/
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extern const console_flow ns16550_flow_RTSCTS;
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extern const console_flow ns16550_flow_DTRCTS;
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/*
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* Helpers for printk
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*/
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void ns16550_outch_polled(console_tbl *c, char out);
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int ns16550_inch_polled(console_tbl *c);
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/* Alternative NS16550 driver using the Termios device context */
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typedef uint8_t (*ns16550_get_reg)(uintptr_t port, uint8_t reg);
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typedef void (*ns16550_set_reg)(uintptr_t port, uint8_t reg, uint8_t value);
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typedef struct ns16550_context ns16550_context;
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typedef uint32_t (*ns16550_calculate_baud_divisor)(ns16550_context *ctx, uint32_t baud);
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struct ns16550_context{
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rtems_termios_device_context base;
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ns16550_get_reg get_reg;
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ns16550_set_reg set_reg;
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uintptr_t port;
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rtems_vector_number irq;
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uint32_t clock;
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uint32_t initial_baud;
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bool has_fractional_divider_register;
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bool has_precision_clock_synthesizer;
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uint8_t modem_control;
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uint8_t line_control;
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uint32_t baud_divisor;
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size_t out_pending;
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rtems_termios_tty *tty;
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ns16550_calculate_baud_divisor calculate_baud_divisor;
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};
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extern const rtems_termios_device_handler ns16550_handler_interrupt;
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extern const rtems_termios_device_handler ns16550_handler_polled;
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extern const rtems_termios_device_handler ns16550_handler_task;
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extern const rtems_termios_device_flow ns16550_flow_rtscts;
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extern const rtems_termios_device_flow ns16550_flow_dtrcts;
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void ns16550_polled_putchar(rtems_termios_device_context *base, char out);
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int ns16550_polled_getchar(rtems_termios_device_context *base);
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bool ns16550_probe(rtems_termios_device_context *base);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NS16550_H_ */
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