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/* UART model.
Copyright (C) 1996-2021 Free Software Foundation, Inc.
Contributed by Cygnus Solutions and Mike Frysinger.
This file is part of simulators.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "config.h"
#include "sim-main.h"
#include "hw-main.h"
#include "dv-sockser.h"
#include "dv-m32r_uart.h"
struct m32r_uart
{
};
static unsigned
m32r_uart_io_write_buffer (struct hw *me, const void *source,
int space, address_word addr, unsigned nr_bytes)
{
SIM_DESC sd = hw_system (me);
struct m32r_uart *uart = hw_data (me);
int status = dv_sockser_status (sd);
switch (addr)
{
case UART_OUTCHAR_ADDR:
if (status & DV_SOCKSER_DISCONNECTED)
{
sim_io_write_stdout (sd, source, nr_bytes);
sim_io_flush_stdout (sd);
}
else
{
/* Normalize errors to a value of 0. */
int ret = dv_sockser_write_buffer (sd, source, nr_bytes);
if (ret < 0)
nr_bytes = 0;
}
break;
}
return nr_bytes;
}
static unsigned
m32r_uart_io_read_buffer (struct hw *me, void *dest,
int space, address_word addr, unsigned nr_bytes)
{
SIM_DESC sd = hw_system (me);
struct m32r_uart *uart = hw_data (me);
int status = dv_sockser_status (sd);
switch (addr)
{
case UART_INCHAR_ADDR:
if (status & DV_SOCKSER_DISCONNECTED)
{
int ret = sim_io_poll_read (sd, 0/*STDIN*/, dest, 1);
return (ret < 0) ? 0 : 1;
}
else
{
char *buffer = dest;
buffer[0] = dv_sockser_read (sd);
return 1;
}
case UART_STATUS_ADDR:
{
unsigned char *p = dest;
p[0] = 0;
p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
#ifdef UART_INPUT_READY0
? UART_INPUT_READY : 0)
#else
? 0 : UART_INPUT_READY)
#endif
+ ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
return 2;
}
}
return nr_bytes;
}
static void
attach_m32r_uart_regs (struct hw *me, struct m32r_uart *uart)
{
address_word attach_address;
int attach_space;
unsigned attach_size;
reg_property_spec reg;
if (hw_find_property (me, "reg") == NULL)
hw_abort (me, "Missing \"reg\" property");
if (!hw_find_reg_array_property (me, "reg", 0, ®))
hw_abort (me, "\"reg\" property must contain three addr/size entries");
hw_unit_address_to_attach_address (hw_parent (me),
®.address,
&attach_space, &attach_address, me);
hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
}
static void
m32r_uart_finish (struct hw *me)
{
struct m32r_uart *uart;
uart = HW_ZALLOC (me, struct m32r_uart);
set_hw_data (me, uart);
set_hw_io_read_buffer (me, m32r_uart_io_read_buffer);
set_hw_io_write_buffer (me, m32r_uart_io_write_buffer);
attach_m32r_uart_regs (me, uart);
}
const struct hw_descriptor dv_m32r_uart_descriptor[] =
{
{"m32r_uart", m32r_uart_finish,},
{NULL, NULL},
};
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