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/**
* @file
*
* @ingroup RTEMSBSPsPowerPCQorIQUartBridge
*
* @brief UART bridge master implementation.
*/
/*
* Copyright (c) 2011-2015 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <sys/stat.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <bspopts.h>
#include <bsp/uart-bridge.h>
#define TRANSMIT_EVENT RTEMS_EVENT_13
static void serial_settings(int fd)
{
struct termios term;
int rv = tcgetattr(fd, &term);
assert(rv == 0);
term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
term.c_oflag &= ~OPOST;
term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
term.c_cflag &= ~(CSIZE | PARENB);
term.c_cflag |= CS8;
term.c_cc [VMIN] = 1;
term.c_cc [VTIME] = 1;
rv = tcsetattr(fd, TCSANOW, &term);
assert(rv == 0);
}
static void uart_bridge_master_service(intercom_packet *packet, void *arg)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
uart_bridge_master_context *ctx = arg;
sc = rtems_chain_append_with_notification(
&ctx->transmit_fifo,
&packet->glue.node,
ctx->transmit_task,
TRANSMIT_EVENT
);
assert(sc == RTEMS_SUCCESSFUL);
}
static void receive_task(rtems_task_argument arg)
{
uart_bridge_master_context *ctx = (uart_bridge_master_context *) arg;
intercom_type type = ctx->type;
int fd = open(ctx->device_path, O_RDONLY);
assert(fd >= 0);
serial_settings(fd);
while (true) {
intercom_packet *packet = qoriq_intercom_allocate_packet(
type,
INTERCOM_SIZE_64
);
ssize_t in = read(fd, packet->data, packet->size - 1);
if (in > 0) {
packet->size = (size_t) in;
qoriq_intercom_send_packet(QORIQ_UART_BRIDGE_SLAVE_CORE, packet);
} else {
qoriq_intercom_free_packet(packet);
}
}
}
static void transmit_task(rtems_task_argument arg)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
uart_bridge_master_context *ctx = (uart_bridge_master_context *) arg;
rtems_chain_control *fifo = &ctx->transmit_fifo;
int fd = open(ctx->device_path, O_WRONLY);
assert(fd >= 0);
serial_settings(fd);
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);
write(fd, packet->data, packet->size);
qoriq_intercom_free_packet(packet);
}
}
static rtems_id create_task(
char name,
rtems_task_entry entry,
uart_bridge_master_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', name, index),
QORIQ_UART_BRIDGE_TASK_PRIORITY,
0,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&task
);
assert(sc == RTEMS_SUCCESSFUL);
sc = rtems_task_start(
task,
entry,
(rtems_task_argument) ctx
);
assert(sc == RTEMS_SUCCESSFUL);
return task;
}
bool qoriq_uart_bridge_master_probe(rtems_termios_device_context *base)
{
uart_bridge_master_context *ctx = (uart_bridge_master_context *) base;
intercom_type type = ctx->type;
qoriq_intercom_service_install(type, uart_bridge_master_service, ctx);
create_task('R', receive_task, ctx);
ctx->transmit_task = create_task('T', transmit_task, ctx);
return true;
}
static bool first_open(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
return false;
}
static bool set_attributes(
rtems_termios_device_context *base,
const struct termios *term
)
{
return false;
}
const rtems_termios_device_handler qoriq_uart_bridge_master = {
.first_open = first_open,
.set_attributes = set_attributes,
.mode = TERMIOS_POLLED
};
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