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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Western Digital Corporation or its affiliates.
*
* Authors:
* Alistair Francis <alistair.francis@wdc.com>
*/
#include <sbi/riscv_io.h>
#include <sbi/sbi_console.h>
#include <sbi_utils/serial/xlnx_uartlite.h>
/* clang-format off */
#define UART_RX_OFFSET 0x00
#define UART_TX_OFFSET 0x04
#define UART_STATUS_OFFSET 0x08
# define UART_STATUS_RXVALID 0x01
# define UART_STATUS_RXFULL 0x02
# define UART_STATUS_TXEMPTY 0x04
# define UART_STATUS_TXFULL 0x08
# define UART_STATUS_IE 0x10
# define UART_STATUS_OVERRUN 0x20
# define UART_STATUS_FRAME 0x40
# define UART_STATUS_PARITY 0x80
#define UART_CTRL_OFFSET 0x0C
# define UART_CTRL_RST_TX 0x01
# define UART_CTRL_RST_RX 0x02
# define UART_CTRL_IE 0x10
/* clang-format on */
static volatile char *xlnx_uartlite_base;
static void xlnx_uartlite_putc(char ch)
{
while((readb(xlnx_uartlite_base + UART_STATUS_OFFSET) & UART_STATUS_TXFULL))
;
writeb(ch, xlnx_uartlite_base + UART_TX_OFFSET);
}
static int xlnx_uartlite_getc(void)
{
u16 status = readb(xlnx_uartlite_base + UART_STATUS_OFFSET);
if (status & UART_STATUS_RXVALID)
return readb(xlnx_uartlite_base + UART_RX_OFFSET);
return -1;
}
static struct sbi_console_device xlnx_uartlite_console = {
.name = "xlnx-uartlite",
.console_putc = xlnx_uartlite_putc,
.console_getc = xlnx_uartlite_getc
};
int xlnx_uartlite_init(unsigned long base)
{
xlnx_uartlite_base = (volatile char *)base;
sbi_console_set_device(&xlnx_uartlite_console);
return 0;
}
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