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144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/* UART model.
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Copyright (C) 1996-2018 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions and Mike Frysinger.
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This file is part of simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "sim-main.h"
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#include "hw-main.h"
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#include "dv-sockser.h"
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#include "dv-m32r_uart.h"
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struct m32r_uart
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{
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};
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static unsigned
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m32r_uart_io_write_buffer (struct hw *me, const void *source,
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int space, address_word addr, unsigned nr_bytes)
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{
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SIM_DESC sd = hw_system (me);
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struct m32r_uart *uart = hw_data (me);
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int status = dv_sockser_status (sd);
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switch (addr)
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{
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case UART_OUTCHAR_ADDR:
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if (status & DV_SOCKSER_DISCONNECTED)
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{
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sim_io_write_stdout (sd, source, nr_bytes);
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sim_io_flush_stdout (sd);
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}
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else
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{
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/* Normalize errors to a value of 0. */
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int ret = dv_sockser_write_buffer (sd, source, nr_bytes);
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if (ret < 0)
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nr_bytes = 0;
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}
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break;
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}
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return nr_bytes;
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}
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static unsigned
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m32r_uart_io_read_buffer (struct hw *me, void *dest,
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int space, address_word addr, unsigned nr_bytes)
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{
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SIM_DESC sd = hw_system (me);
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struct m32r_uart *uart = hw_data (me);
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int status = dv_sockser_status (sd);
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switch (addr)
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{
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case UART_INCHAR_ADDR:
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if (status & DV_SOCKSER_DISCONNECTED)
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{
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int ret = sim_io_poll_read (sd, 0/*STDIN*/, dest, 1);
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return (ret < 0) ? 0 : 1;
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}
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else
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{
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char *buffer = dest;
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buffer[0] = dv_sockser_read (sd);
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return 1;
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}
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case UART_STATUS_ADDR:
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{
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unsigned char *p = dest;
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p[0] = 0;
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p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
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#ifdef UART_INPUT_READY0
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? UART_INPUT_READY : 0)
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#else
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? 0 : UART_INPUT_READY)
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#endif
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+ ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
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return 2;
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}
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}
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return nr_bytes;
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}
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static void
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attach_m32r_uart_regs (struct hw *me, struct m32r_uart *uart)
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{
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address_word attach_address;
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int attach_space;
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unsigned attach_size;
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reg_property_spec reg;
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if (hw_find_property (me, "reg") == NULL)
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hw_abort (me, "Missing \"reg\" property");
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if (!hw_find_reg_array_property (me, "reg", 0, ®))
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hw_abort (me, "\"reg\" property must contain three addr/size entries");
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hw_unit_address_to_attach_address (hw_parent (me),
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®.address,
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&attach_space, &attach_address, me);
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hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me);
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hw_attach_address (hw_parent (me),
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0, attach_space, attach_address, attach_size, me);
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}
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static void
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m32r_uart_finish (struct hw *me)
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{
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struct m32r_uart *uart;
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uart = HW_ZALLOC (me, struct m32r_uart);
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set_hw_data (me, uart);
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set_hw_io_read_buffer (me, m32r_uart_io_read_buffer);
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set_hw_io_write_buffer (me, m32r_uart_io_write_buffer);
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attach_m32r_uart_regs (me, uart);
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}
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const struct hw_descriptor dv_m32r_uart_descriptor[] =
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{
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{"m32r_uart", m32r_uart_finish,},
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{NULL, NULL},
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};
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