1/* 2 * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7#include <arch.h> 8#include <asm_macros.S> 9#define USE_FINISH_CONSOLE_REG_2 10#include <console_macros.S> 11#include <assert_macros.S> 12#include "imx_uart.h" 13 14#define URXD 0x0 /* Receiver Register */ 15#define UTXD 0x40 /* Transmitter Register */ 16#define UTS 0xb4 /* UART Test Register (mx31) */ 17#define URXD_RX_DATA (0xFF) 18 19 .globl console_imx_uart_register 20 .globl console_imx_uart_init 21 .globl console_imx_uart_putc 22 .globl console_imx_uart_getc 23 .globl console_imx_uart_flush 24 25func console_imx_uart_register 26 mov x7, x30 27 mov x6, x3 28 cbz x6, register_fail 29 str x0, [x6, #CONSOLE_T_DRVDATA] 30 31 bl console_imx_uart_init 32 cbz x0, register_fail 33 34 mov x0, x6 35 mov x30, x7 36 finish_console_register imx_uart putc=1, getc=1, flush=1 37 38register_fail: 39 ret x7 40endfunc console_imx_uart_register 41 42func console_imx_uart_init 43 mov w0, #1 44 ret 45endfunc console_imx_uart_init 46 47func console_imx_uart_putc 48 ldr x1, [x1, #CONSOLE_T_DRVDATA] 49 cbz x1, putc_error 50 51 /* Prepare '\r' to '\n' */ 52 cmp w0, #0xA 53 b.ne 2f 541: 55 /* Check if the transmit FIFO is full */ 56 ldr w2, [x1, #UTS] 57 tbz w2, #6, 1b 58 mov w2, #0xD 59 str w2, [x1, #UTXD] 602: 61 /* Check if the transmit FIFO is full */ 62 ldr w2, [x1, #UTS] 63 tbz w2, #6, 2b 64 str w0, [x1, #UTXD] 65 ret 66putc_error: 67 mov w0, #-1 68 ret 69endfunc console_imx_uart_putc 70 71func console_imx_uart_getc 72 ldr x0, [x0, #CONSOLE_T_DRVDATA] 73 cbz x0, getc_error 741: 75 ldr w1, [x0, #UTS] 76 tbnz w1, #5, 1b 77 78 ldr w1, [x0, #URXD] 79 and w0, w1, #URXD_RX_DATA 80 81 ret 82getc_error: 83 mov w0, #-1 84 ret 85endfunc console_imx_uart_getc 86 87func console_imx_uart_flush 88 mov x0, #0 89 ret 90endfunc console_imx_uart_flush 91