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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2023 Keith Packard
*
* 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.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 HOLDER 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 "or1k_semihost.h"
typedef volatile uint8_t vuint8_t;
struct uart_16550 {
vuint8_t data;
vuint8_t ier;
vuint8_t iir;
vuint8_t lcr;
vuint8_t mcr;
vuint8_t lsr;
vuint8_t msr;
vuint8_t scr;
};
/* openrisc virt serial port */
#define uart (*((struct uart_16550 *) 0x90000000))
#define UART_LSR_FIFOE 0x80 /* Fifo error */
#define UART_LSR_TEMT 0x40 /* Transmitter empty */
#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
#define UART_LSR_BI 0x10 /* Break interrupt indicator */
#define UART_LSR_FE 0x08 /* Frame error indicator */
#define UART_LSR_PE 0x04 /* Parity error indicator */
#define UART_LSR_OE 0x02 /* Overrun error indicator */
#define UART_LSR_DR 0x01 /* Receiver data ready */
int
or1k_putc(char c, FILE *file)
{
(void) file;
while ((uart.lsr & (UART_LSR_TEMT|UART_LSR_THRE)) != (UART_LSR_TEMT|UART_LSR_THRE))
;
uart.data = (uint8_t) c;
return (unsigned char) c;
}
#ifdef __TINY_STDIO
static int
or1k_getc(FILE *file)
{
(void) file;
return EOF;
}
static FILE __stdio = FDEV_SETUP_STREAM(or1k_putc, or1k_getc, NULL, _FDEV_SETUP_RW);
#ifdef __strong_reference
#define STDIO_ALIAS(x) __strong_reference(stdin, x);
#else
#define STDIO_ALIAS(x) FILE *const x = &__stdio;
#endif
FILE *const stdin = &__stdio;
STDIO_ALIAS(stdout);
STDIO_ALIAS(stderr);
#endif
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