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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsPowerPCQorIQUartBridge
*
* @brief UART bridge slave implementation.
*/
/*
* Copyright (c) 2011 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 <libchip/sersupp.h>
#include <bspopts.h>
#include <bsp/uart-bridge.h>
#define TRANSMIT_EVENT RTEMS_EVENT_13
static rtems_mode disable_preemption(void)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_mode prev_mode = 0;
sc = rtems_task_mode (RTEMS_NO_PREEMPT, RTEMS_PREEMPT_MASK, &prev_mode);
assert(sc == RTEMS_SUCCESSFUL);
return prev_mode;
}
static void restore_preemption(rtems_mode prev_mode)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
sc = rtems_task_mode (prev_mode, RTEMS_PREEMPT_MASK, &prev_mode);
assert(sc == RTEMS_SUCCESSFUL);
}
static void uart_bridge_slave_service(intercom_packet *packet, void *arg)
{
uart_bridge_slave_context *ctx = arg;
struct rtems_termios_tty *tty = ctx->tty;
/* Workaround for https://www.rtems.org/bugzilla/show_bug.cgi?id=1736 */
rtems_mode prev_mode = disable_preemption();
rtems_termios_enqueue_raw_characters(tty, packet->data, (int) packet->size);
qoriq_intercom_free_packet(packet);
restore_preemption(prev_mode);
}
static void transmit_task(rtems_task_argument arg)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
uart_bridge_slave_context *ctx = (uart_bridge_slave_context *) arg;
rtems_chain_control *fifo = &ctx->transmit_fifo;
struct rtems_termios_tty *tty = ctx->tty;
while (true) {
intercom_packet *packet = NULL;
sc = rtems_chain_get_with_wait(
fifo,
TRANSMIT_EVENT,
RTEMS_NO_TIMEOUT,
(rtems_chain_node **) &packet
);
assert(sc == RTEMS_SUCCESSFUL);
/* Workaround for https://www.rtems.org/bugzilla/show_bug.cgi?id=1736 */
rtems_mode prev_mode = disable_preemption();
size_t size = packet->size;
qoriq_intercom_send_packet(QORIQ_UART_BRIDGE_MASTER_CORE, packet);
rtems_termios_dequeue_characters(tty, (int) size);
restore_preemption(prev_mode);
}
}
static void create_transmit_task(
uart_bridge_slave_context *ctx
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_id task = RTEMS_ID_NONE;
char index = (char) ('0' + ctx->type - INTERCOM_TYPE_UART_0);
sc = rtems_task_create(
rtems_build_name('U', 'B', 'T', index),
QORIQ_UART_BRIDGE_TASK_PRIORITY,
0,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&task
);
assert(sc == RTEMS_SUCCESSFUL);
sc = rtems_task_start(
task,
transmit_task,
(rtems_task_argument) ctx
);
assert(sc == RTEMS_SUCCESSFUL);
ctx->transmit_task = task;
}
static bool first_open(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
uart_bridge_slave_context *ctx = (uart_bridge_slave_context *) base;
intercom_type type = ctx->type;
ctx->tty = tty;
rtems_termios_set_initial_baud(tty, 115200);
create_transmit_task(ctx);
qoriq_intercom_service_install(type, uart_bridge_slave_service, ctx);
return true;
}
static void last_close(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
uart_bridge_slave_context *ctx = (uart_bridge_slave_context *) base;
qoriq_intercom_service_remove(ctx->type);
}
static void write_with_interrupts(
rtems_termios_device_context *base,
const char *buf,
size_t len
)
{
if (len > 0) {
rtems_status_code sc = RTEMS_SUCCESSFUL;
uart_bridge_slave_context *ctx = (uart_bridge_slave_context *) base;
intercom_packet *packet = qoriq_intercom_allocate_packet(
ctx->type,
INTERCOM_SIZE_64
);
packet->size = len;
memcpy(packet->data, buf, len);
/*
* Due to the lovely Termios implementation we have to hand this over to
* another context.
*/
sc = rtems_chain_append_with_notification(
&ctx->transmit_fifo,
&packet->glue.node,
ctx->transmit_task,
TRANSMIT_EVENT
);
assert(sc == RTEMS_SUCCESSFUL);
}
}
static bool set_attributes(
rtems_termios_device_context *base,
const struct termios *term
)
{
return false;
}
const rtems_termios_device_handler qoriq_uart_bridge_slave = {
.first_open = first_open,
.last_close = last_close,
.write = write_with_interrupts,
.set_attributes = set_attributes,
.mode = TERMIOS_IRQ_DRIVEN
};
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