diff options
Diffstat (limited to 'bsps/microblaze/shared/dev/serial/uartlite.c')
-rw-r--r-- | bsps/microblaze/shared/dev/serial/uartlite.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/bsps/microblaze/shared/dev/serial/uartlite.c b/bsps/microblaze/shared/dev/serial/uartlite.c new file mode 100644 index 0000000000..7387e22635 --- /dev/null +++ b/bsps/microblaze/shared/dev/serial/uartlite.c @@ -0,0 +1,145 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSBSPsMicroblaze + * + * @brief MicroBlaze AXI UART Lite support + */ + +/* + * Copyright (C) 2021 On-Line Applications Research Corporation (OAR) + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <bsp/irq.h> +#include <dev/serial/uartlite.h> + +#ifdef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS +static void microblaze_uart_interrupt( void *arg ) +{ + rtems_termios_tty *tty = arg; + uart_lite_context *ctx = rtems_termios_get_device_context( tty ); + + while ( !XUartLite_IsReceiveEmpty( ctx->address ) ) { + char c = (char) XUartLite_ReadReg( ctx->address, XUL_RX_FIFO_OFFSET ); + rtems_termios_enqueue_raw_characters( tty, &c, 1 ); + } + + while ( ctx->transmitting && !XUartLite_IsTransmitEmpty( ctx ) ) { + rtems_termios_dequeue_characters( tty, 1 ); + } +} +#endif + +static bool uart_first_open( + struct rtems_termios_tty *tty, + rtems_termios_device_context *base, + struct termios *term, + rtems_libio_open_close_args_t *args +) +{ + uart_lite_context *ctx = (uart_lite_context *) base; +#ifdef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS + rtems_status_code sc; +#endif + + rtems_termios_set_initial_baud( tty, ctx->initial_baud ); + +#ifdef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS + XUartLite_EnableIntr( ctx->address ); + sc = rtems_interrupt_handler_install( + 1, + "UART", + RTEMS_INTERRUPT_SHARED, + microblaze_uart_interrupt, + tty + ); + if ( sc != RTEMS_SUCCESSFUL ) { + return false; + } +#endif + + return true; +} + +static void uart_last_close( + rtems_termios_tty *tty, + rtems_termios_device_context *base, + rtems_libio_open_close_args_t *args +) +{ +#ifdef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS + rtems_interrupt_handler_remove( 1, microblaze_uart_interrupt, tty ); +#endif +} + +#ifndef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS +static int uart_read_polled( rtems_termios_device_context *base ) +{ + uart_lite_context *ctx = (uart_lite_context *) base; + + if ( XUartLite_IsReceiveEmpty( ctx->address ) ) { + return -1; + } + + return XUartLite_ReadReg( ctx->address, XUL_RX_FIFO_OFFSET ); +} +#endif + +static void uart_write( + rtems_termios_device_context *base, + const char *s, + size_t n +) +{ + uart_lite_context *ctx = (uart_lite_context *) base; + +#ifdef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS + if ( n > 0 ) { + ctx->transmitting = true; + XUartLite_SendByte( ctx->address, s[0] ); + } else { + ctx->transmitting = false; + } +#else + size_t i = 0; + + for ( i = 0; i < n; ++i ) { + XUartLite_SendByte( ctx->address, s[i] ); + } +#endif +} + +const rtems_termios_device_handler microblaze_uart_fns = { + .first_open = uart_first_open, + .last_close = uart_last_close, + .write = uart_write, +#ifdef BSP_MICROBLAZE_FPGA_CONSOLE_INTERRUPTS + .mode = TERMIOS_IRQ_DRIVEN +#else + .poll_read = uart_read_polled, + .mode = TERMIOS_POLLED +#endif +}; |