forked from Imagelibrary/rtems
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
|
|
|
|
/*
|
|
* Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved.
|
|
*
|
|
* 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 <dev/serial/arm-pl011.h>
|
|
|
|
static volatile pl011 *pl011_get_regs(rtems_termios_device_context *base)
|
|
{
|
|
arm_pl011_context *ctx = (arm_pl011_context *) base;
|
|
|
|
return ctx->regs;
|
|
}
|
|
|
|
|
|
bool arm_pl011_probe(rtems_termios_device_context *base)
|
|
{
|
|
volatile pl011 *regs = pl011_get_regs(base);
|
|
|
|
regs->uartlcr_h = PL011_UARTLCR_H_WLEN(PL011_UARTLCR_H_WLEN_8);
|
|
regs->uartcr = PL011_UARTCR_RXE
|
|
| PL011_UARTCR_TXE
|
|
| PL011_UARTCR_UARTEN;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool pl011_first_open(
|
|
struct rtems_termios_tty *tty,
|
|
rtems_termios_device_context *base,
|
|
struct termios *term,
|
|
rtems_libio_open_close_args_t *args
|
|
)
|
|
{
|
|
arm_pl011_context *ctx = (arm_pl011_context *) base;
|
|
|
|
rtems_termios_set_initial_baud(tty, ctx->initial_baud);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int pl011_read_polled(rtems_termios_device_context *base)
|
|
{
|
|
volatile pl011 *regs = pl011_get_regs(base);
|
|
|
|
if ((regs->uartfr & PL011_UARTFR_RXFE) != 0) {
|
|
return -1;
|
|
} else {
|
|
return PL011_UARTDR_DATA_GET(regs->uartdr);
|
|
}
|
|
}
|
|
|
|
void arm_pl011_write_polled(rtems_termios_device_context *base, char c)
|
|
{
|
|
volatile pl011 *regs = pl011_get_regs(base);
|
|
|
|
while ((regs->uartfr & PL011_UARTFR_TXFF) != 0) {
|
|
/* Wait */
|
|
}
|
|
|
|
regs->uartdr = PL011_UARTDR_DATA(c);
|
|
}
|
|
|
|
static void pl011_write_support_polled(
|
|
rtems_termios_device_context *base,
|
|
const char *s,
|
|
size_t n
|
|
)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < n; ++i) {
|
|
arm_pl011_write_polled(base, s[i]);
|
|
}
|
|
}
|
|
|
|
const rtems_termios_device_handler arm_pl011_fns = {
|
|
.first_open = pl011_first_open,
|
|
.poll_read = pl011_read_polled,
|
|
.write = pl011_write_support_polled,
|
|
.mode = TERMIOS_POLLED
|
|
};
|