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/*
* 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
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