1d8e919c7SMasahiro Yamada/* 2*831b0e98SJimmy Brisson * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved. 3d8e919c7SMasahiro Yamada * 4d8e919c7SMasahiro Yamada * SPDX-License-Identifier: BSD-3-Clause 5d8e919c7SMasahiro Yamada */ 6d8e919c7SMasahiro Yamada 7d8e919c7SMasahiro Yamada#include <asm_macros.S> 8ac9f1b55SMasahiro Yamada#include <drivers/console.h> 9d8e919c7SMasahiro Yamada 10ac9f1b55SMasahiro Yamada#include "uniphier_console.h" 11d8e919c7SMasahiro Yamada 12d8e919c7SMasahiro Yamada/* 13d8e919c7SMasahiro Yamada * In: w0 - character to be printed 14ac9f1b55SMasahiro Yamada * x1 - pointer to console structure 15ac9f1b55SMasahiro Yamada * Out: return the character written (always succeeds) 16d8e919c7SMasahiro Yamada * Clobber: x2 17d8e919c7SMasahiro Yamada */ 18ac9f1b55SMasahiro Yamada .globl uniphier_console_putc 19ac9f1b55SMasahiro Yamadafunc uniphier_console_putc 20af1e8fdaSAndre Przywara ldr x1, [x1, #CONSOLE_T_BASE] 21d8e919c7SMasahiro Yamada 22d8e919c7SMasahiro Yamada /* Wait until the transmitter FIFO gets empty */ 23d8e919c7SMasahiro Yamada0: ldr w2, [x1, #UNIPHIER_UART_LSR] 24d8e919c7SMasahiro Yamada tbz w2, #UNIPHIER_UART_LSR_THRE_BIT, 0b 25d8e919c7SMasahiro Yamada 26abfd5719SMasahiro Yamada str w0, [x1, #UNIPHIER_UART_TX] 27d8e919c7SMasahiro Yamada 28abfd5719SMasahiro Yamada ret 29ac9f1b55SMasahiro Yamadaendfunc uniphier_console_putc 30d8e919c7SMasahiro Yamada 31d8e919c7SMasahiro Yamada/* 32ac9f1b55SMasahiro Yamada * In: x0 - pointer to console structure 33ac9f1b55SMasahiro Yamada * Out: return the character read, or ERROR_NO_PENDING_CHAR if no character 34ac9f1b55SMasahiro Yamada is available 35d8e919c7SMasahiro Yamada * Clobber: x1 36d8e919c7SMasahiro Yamada */ 37ac9f1b55SMasahiro Yamada .globl uniphier_console_getc 38ac9f1b55SMasahiro Yamadafunc uniphier_console_getc 39af1e8fdaSAndre Przywara ldr x0, [x0, #CONSOLE_T_BASE] 40d8e919c7SMasahiro Yamada 41ac9f1b55SMasahiro Yamada ldr w1, [x0, #UNIPHIER_UART_LSR] 42ac9f1b55SMasahiro Yamada tbz w1, #UNIPHIER_UART_LSR_DR_BIT, 0f 43d8e919c7SMasahiro Yamada 44d8e919c7SMasahiro Yamada ldr w0, [x0, #UNIPHIER_UART_RX] 45ac9f1b55SMasahiro Yamada ret 46d8e919c7SMasahiro Yamada 47ac9f1b55SMasahiro Yamada0: mov w0, #ERROR_NO_PENDING_CHAR 48d8e919c7SMasahiro Yamada ret 49ac9f1b55SMasahiro Yamadaendfunc uniphier_console_getc 50d8e919c7SMasahiro Yamada 51d8e919c7SMasahiro Yamada/* 52ac9f1b55SMasahiro Yamada * In: x0 - pointer to console structure 53ac9f1b55SMasahiro Yamada * Out: return 0 (always succeeds) 54d8e919c7SMasahiro Yamada * Clobber: x1 55d8e919c7SMasahiro Yamada */ 56ac9f1b55SMasahiro Yamada .global uniphier_console_flush 57ac9f1b55SMasahiro Yamadafunc uniphier_console_flush 58af1e8fdaSAndre Przywara ldr x0, [x0, #CONSOLE_T_BASE] 59d8e919c7SMasahiro Yamada 60d8e919c7SMasahiro Yamada /* wait until the transmitter gets empty */ 61d8e919c7SMasahiro Yamada0: ldr w1, [x0, #UNIPHIER_UART_LSR] 62d8e919c7SMasahiro Yamada tbz w1, #UNIPHIER_UART_LSR_TEMT_BIT, 0b 63d8e919c7SMasahiro Yamada 64d8e919c7SMasahiro Yamada ret 65ac9f1b55SMasahiro Yamadaendfunc uniphier_console_flush 66