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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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