forked from Imagelibrary/rtems
130 lines
3.7 KiB
C
130 lines
3.7 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 <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
|
|
};
|