You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.4 KiB
66 lines
1.4 KiB
/*
|
|
* Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <asm_macros.S>
|
|
#include <drivers/console.h>
|
|
|
|
#include "uniphier_console.h"
|
|
|
|
/*
|
|
* In: w0 - character to be printed
|
|
* x1 - pointer to console structure
|
|
* Out: return the character written (always succeeds)
|
|
* Clobber: x2
|
|
*/
|
|
.globl uniphier_console_putc
|
|
func uniphier_console_putc
|
|
ldr x1, [x1, #CONSOLE_T_BASE]
|
|
|
|
/* Wait until the transmitter FIFO gets empty */
|
|
0: ldr w2, [x1, #UNIPHIER_UART_LSR]
|
|
tbz w2, #UNIPHIER_UART_LSR_THRE_BIT, 0b
|
|
|
|
str w0, [x1, #UNIPHIER_UART_TX]
|
|
|
|
ret
|
|
endfunc uniphier_console_putc
|
|
|
|
/*
|
|
* In: x0 - pointer to console structure
|
|
* Out: return the character read, or ERROR_NO_PENDING_CHAR if no character
|
|
is available
|
|
* Clobber: x1
|
|
*/
|
|
.globl uniphier_console_getc
|
|
func uniphier_console_getc
|
|
ldr x0, [x0, #CONSOLE_T_BASE]
|
|
|
|
ldr w1, [x0, #UNIPHIER_UART_LSR]
|
|
tbz w1, #UNIPHIER_UART_LSR_DR_BIT, 0f
|
|
|
|
ldr w0, [x0, #UNIPHIER_UART_RX]
|
|
ret
|
|
|
|
0: mov w0, #ERROR_NO_PENDING_CHAR
|
|
ret
|
|
endfunc uniphier_console_getc
|
|
|
|
/*
|
|
* In: x0 - pointer to console structure
|
|
* Out: return 0 (always succeeds)
|
|
* Clobber: x1
|
|
*/
|
|
.global uniphier_console_flush
|
|
func uniphier_console_flush
|
|
ldr x0, [x0, #CONSOLE_T_BASE]
|
|
|
|
/* wait until the transmitter gets empty */
|
|
0: ldr w1, [x0, #UNIPHIER_UART_LSR]
|
|
tbz w1, #UNIPHIER_UART_LSR_TEMT_BIT, 0b
|
|
|
|
ret
|
|
endfunc uniphier_console_flush
|