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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Pragnesh Patel <pragnesh.patel@sifive.com>
* Copyright (c) 2019 Sachin Ghadi <sachin.ghadi@sifive.com>
*
* 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/riscv.h>
#include <bsp/fe310-uart.h>
#include <assert.h>
static void irq_handler(void *arg)
{
/*TODO*/
}
int fe310_uart_read(rtems_termios_device_context *base)
{
fe310_uart_context * ctx = (fe310_uart_context*) base;
size_t i;
if (((ctx->regs->rxdata) & TXRXREADY) != 0) {
return -1;
} else {
return ctx->regs->rxdata;
}
}
static ssize_t fe310_uart_write (
rtems_termios_device_context *base,
const char *buf,
size_t n
)
{
fe310_uart_context * ctx = (fe310_uart_context*) base;
size_t i;
rtems_status_code sc;
(ctx->regs)->div = riscv_get_core_frequency()/ 115200 - 1;
(ctx->regs)->txctrl |= 1;
(ctx->regs)->rxctrl |= 1;
for (i = 0; i < n; ++i) {
while (((ctx->regs->txdata) & TXRXREADY) != 0) {
;
}
ctx->regs->txdata = buf[i];
}
return n;
}
void fe310_console_putchar(rtems_termios_device_context * context,char c)
{
fe310_uart_write ( context, &c,1);
}
void console_context_init(
rtems_termios_device_context *base,
int device_tree_node
)
{
/*TODO*/
}
static bool fe310_uart_first_open (
rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
fe310_uart_context * ctx;
rtems_status_code sc;
/* Configure GPIO to be UART */
sc = rtems_termios_set_initial_baud (tty, B115200);
if ( sc != RTEMS_SUCCESSFUL ) {
return false;
}
/* Set up a baud rate and enable tx and rx */
ctx = (fe310_uart_context *) base;
(ctx->regs)->div = riscv_get_core_frequency()/ 115200 - 1;
(ctx->regs)->txctrl |= 1;
(ctx->regs)->rxctrl |= 1;
return true;
};
const rtems_termios_device_handler fe310_uart_handler = {
.first_open = fe310_uart_first_open,
.write = fe310_uart_write,
.poll_read = fe310_uart_read,
.mode = TERMIOS_POLLED
};
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