/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2012, 2015 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.
*/
/*
* Console driver for Lauterbach Trace32 Simulator. The implementation is
* based on the example in "demo/powerpc/etc/terminal/terminal_mpc85xx.cmm" in
* the Trace32 system directory.
*/
#include <rtems/bspIo.h>
#include <rtems/console.h>
#include <rtems/termiostypes.h>
RTEMS_SECTION(".rtemsrwset.t32") volatile unsigned char messagebufferin[256];
RTEMS_SECTION(".rtemsrwset.t32") volatile unsigned char messagebufferout[256];
typedef struct {
rtems_termios_device_context base;
int input_size;
int input_index;
} t32_console_context;
static t32_console_context t32_console_instance;
static bool t32_console_first_open(
rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
rtems_termios_set_initial_baud(tty, 115200);
return true;
}
static int t32_console_read_polled(rtems_termios_device_context *base)
{
t32_console_context *ctx = (t32_console_context *) base;
int c;
if (ctx->input_size == 0) {
int new_bufsize = messagebufferin[0];
if (new_bufsize != 0) {
ctx->input_size = new_bufsize;
ctx->input_index = 0;
} else {
return -1;
}
}
c = messagebufferin[4 + ctx->input_index];
++ctx->input_index;
if (ctx->input_index >= ctx->input_size) {
messagebufferin[0] = 0;
ctx->input_size = 0;
}
return c;
}
static void t32_console_write_char_polled(char c)
{
while (messagebufferout[0] != 0) {
/* Wait for ready */
}
messagebufferout[4] = (unsigned char) c;
messagebufferout[0] = 1;
}
static void t32_console_write_polled(
rtems_termios_device_context *base,
const char *s,
size_t n
)
{
size_t i;
for (i = 0; i < n; ++i) {
t32_console_write_char_polled(s[i]);
}
}
const rtems_termios_device_handler t32_console_handler = {
.first_open = t32_console_first_open,
.poll_read = t32_console_read_polled,
.write = t32_console_write_polled,
.mode = TERMIOS_POLLED
};
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
t32_console_context *ctx = &t32_console_instance;
rtems_termios_initialize();
rtems_termios_device_context_initialize(&ctx->base, "T32 Console");
rtems_termios_device_install(
CONSOLE_DEVICE_NAME,
&t32_console_handler,
NULL,
&ctx->base
);
return RTEMS_SUCCESSFUL;
}
BSP_output_char_function_type BSP_output_char = t32_console_write_char_polled;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
