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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 "sparc-semihost.h"
typedef volatile uint8_t vuint8_t;
typedef volatile uint32_t vuint32_t;
struct apbuart {
vuint32_t data;
vuint32_t status;
vuint32_t control;
};
#ifdef __GNUCLIKE_PRAGMA_DIAGNOSTIC
#pragma GCC diagnostic ignored "-Wpragmas"
#pragma GCC diagnostic ignored "-Wunknown-warning-option"
/* 'bsize' is used directly with malloc/realloc which confuses -fanalyzer */
#pragma GCC diagnostic ignored "-Warray-bounds"
#endif
/* leon3 serial port */
#define uart (*((struct apbuart *) 0x80000100))
/* UART status register fields */
#define UART_DATA_READY (1 << 0)
#define UART_TRANSMIT_SHIFT_EMPTY (1 << 1)
#define UART_TRANSMIT_FIFO_EMPTY (1 << 2)
#define UART_BREAK_RECEIVED (1 << 3)
#define UART_OVERRUN (1 << 4)
#define UART_PARITY_ERROR (1 << 5)
#define UART_FRAMING_ERROR (1 << 6)
#define UART_TRANSMIT_FIFO_HALF (1 << 7)
#define UART_RECEIVE_FIFO_HALF (1 << 8)
#define UART_TRANSMIT_FIFO_FULL (1 << 9)
#define UART_RECEIVE_FIFO_FULL (1 << 10)
/* UART control register fields */
#define UART_RECEIVE_ENABLE (1 << 0)
#define UART_TRANSMIT_ENABLE (1 << 1)
#define UART_RECEIVE_INTERRUPT (1 << 2)
#define UART_TRANSMIT_INTERRUPT (1 << 3)
#define UART_PARITY_SELECT (1 << 4)
#define UART_PARITY_ENABLE (1 << 5)
#define UART_FLOW_CONTROL (1 << 6)
#define UART_LOOPBACK (1 << 7)
#define UART_EXTERNAL_CLOCK (1 << 8)
#define UART_RECEIVE_FIFO_INTERRUPT (1 << 9)
#define UART_TRANSMIT_FIFO_INTERRUPT (1 << 10)
#define UART_FIFO_DEBUG_MODE (1 << 11)
#define UART_OUTPUT_ENABLE (1 << 12)
#define UART_FIFO_AVAILABLE (1 << 31)
int
sparc_putc(char c, FILE *file)
{
(void) file;
uart.control |= UART_TRANSMIT_ENABLE;
while ((uart.status & UART_TRANSMIT_FIFO_FULL) != 0)
;
uart.data = (uint8_t) c;
return (unsigned char) c;
}
#ifdef __TINY_STDIO
static int
sparc_getc(FILE *file)
{
(void) file;
uart.control |= UART_RECEIVE_ENABLE;
while ((uart.status & UART_DATA_READY) == 0)
;
return (unsigned char) uart.data;
}
static FILE __stdio = FDEV_SETUP_STREAM(sparc_putc, sparc_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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