| /* |
| * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <console_macros.S> |
| #include <assert_macros.S> |
| #include "imx8_lpuart.h" |
| |
| .globl console_lpuart_register |
| .globl console_lpuart_init |
| .globl console_lpuart_putc |
| .globl console_lpuart_getc |
| .globl console_lpuart_flush |
| |
| func console_lpuart_register |
| mov x7, x30 |
| mov x6, x3 |
| cbz x6, register_fail |
| str x0, [x6, #CONSOLE_T_BASE] |
| |
| bl console_lpuart_init |
| cbz x0, register_fail |
| |
| mov x0, x6 |
| mov x30, x7 |
| finish_console_register lpuart putc=1, getc=1, flush=1 |
| |
| register_fail: |
| ret x7 |
| endfunc console_lpuart_register |
| |
| func console_lpuart_init |
| mov w0, #1 |
| ret |
| endfunc console_lpuart_init |
| |
| func console_lpuart_putc |
| ldr x1, [x1, #CONSOLE_T_BASE] |
| cbz x1, putc_error |
| /* Prepare '\r' to '\n' */ |
| cmp w0, #0xA |
| b.ne 2f |
| 1: |
| /* Check if the transmit FIFO is full */ |
| ldr w2, [x1, #STAT] |
| tbz w2, #23, 1b |
| mov w2, #0xD |
| str w2, [x1, #DATA] |
| 2: |
| /* Check if the transmit FIFO is full */ |
| ldr w2, [x1, #STAT] |
| tbz w2, #23, 2b |
| str w0, [x1, #DATA] |
| ret |
| putc_error: |
| mov w0, #-1 |
| ret |
| endfunc console_lpuart_putc |
| |
| func console_lpuart_getc |
| ldr x0, [x0, #CONSOLE_T_BASE] |
| cbz x0, getc_error |
| /* Check if the receive FIFO state */ |
| ret |
| getc_error: |
| mov w0, #-1 |
| ret |
| endfunc console_lpuart_getc |
| |
| func console_lpuart_flush |
| mov x0, #0 |
| ret |
| endfunc console_lpuart_flush |