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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2013, 2014 embedded brains GmbH & Co. KG
*
* 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 <assert.h>
#include <bsp/irq.h>
#include <bsp/arm-pl050.h>
static volatile pl050 *pl050_get_regs(rtems_termios_device_context *base)
{
arm_pl050_context *ctx = (arm_pl050_context *) base;
return ctx->regs;
}
static void pl050_interrupt(void *arg)
{
rtems_termios_tty *tty = arg;
rtems_termios_device_context *base = rtems_termios_get_device_context(tty);
volatile pl050 *regs = pl050_get_regs(base);
uint32_t kmiir_rx = PL050_KMIIR_KMIRXINTR;
uint32_t kmiir_tx = (regs->kmicr & PL050_KMICR_KMITXINTREN) != 0 ?
PL050_KMIIR_KMITXINTR : 0;
uint32_t kmiir = regs->kmiir;
if ((kmiir & kmiir_rx) != 0) {
char c = (char) PL050_KMIDATA_KMIDATA_GET(regs->kmidata);
rtems_termios_enqueue_raw_characters(tty, &c, 1);
}
if ((kmiir & kmiir_tx) != 0) {
rtems_termios_dequeue_characters(tty, 1);
}
}
static bool pl050_first_open(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
arm_pl050_context *ctx = (arm_pl050_context *) base;
volatile pl050 *regs = pl050_get_regs(base);
rtems_status_code sc;
rtems_termios_set_initial_baud(tty, ctx->initial_baud);
regs->kmicr = PL050_KMICR_KMIEN | PL050_KMICR_KMIRXINTREN;
sc = rtems_interrupt_handler_install(
ctx->irq,
"PL050",
RTEMS_INTERRUPT_UNIQUE,
pl050_interrupt,
tty
);
assert(sc == RTEMS_SUCCESSFUL);
return true;
}
static void pl050_last_close(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
arm_pl050_context *ctx = (arm_pl050_context *) base;
volatile pl050 *regs = pl050_get_regs(base);
rtems_status_code sc;
regs->kmicr = 0;
sc = rtems_interrupt_handler_remove(
ctx->irq,
pl050_interrupt,
tty
);
assert(sc == RTEMS_SUCCESSFUL);
}
static void pl050_write_support(
rtems_termios_device_context *base,
const char *s,
size_t n
)
{
volatile pl050 *regs = pl050_get_regs(base);
if (n > 0) {
regs->kmidata = PL050_KMIDATA_KMIDATA(s[0]);
regs->kmicr |= PL050_KMICR_KMITXINTREN;
} else {
regs->kmicr &= ~PL050_KMICR_KMITXINTREN;
}
}
const rtems_termios_device_handler arm_pl050_fns = {
.first_open = pl050_first_open,
.last_close = pl050_last_close,
.write = pl050_write_support,
.mode = TERMIOS_IRQ_DRIVEN
};
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