90 lines
1.7 KiB
ArmAsm
90 lines
1.7 KiB
ArmAsm
/*
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* Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <console_macros.S>
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#include <assert_macros.S>
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#include "imx_uart.h"
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#define URXD 0x0 /* Receiver Register */
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#define UTXD 0x40 /* Transmitter Register */
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#define UTS 0xb4 /* UART Test Register (mx31) */
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#define URXD_RX_DATA (0xFF)
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.globl console_imx_uart_register
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.globl console_imx_uart_init
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.globl console_imx_uart_putc
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.globl console_imx_uart_getc
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.globl console_imx_uart_flush
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func console_imx_uart_register
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mov x7, x30
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mov x6, x3
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cbz x6, register_fail
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str x0, [x6, #CONSOLE_T_DRVDATA]
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bl console_imx_uart_init
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cbz x0, register_fail
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mov x0, x6
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mov x30, x7
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finish_console_register imx_uart putc=1, getc=1, flush=1
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register_fail:
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ret x7
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endfunc console_imx_uart_register
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func console_imx_uart_init
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mov w0, #1
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ret
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endfunc console_imx_uart_init
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func console_imx_uart_putc
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ldr x1, [x1, #CONSOLE_T_DRVDATA]
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cbz x1, putc_error
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/* Prepare '\r' to '\n' */
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cmp w0, #0xA
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b.ne 2f
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1:
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/* Check if the transmit FIFO is full */
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ldr w2, [x1, #UTS]
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tbz w2, #6, 1b
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mov w2, #0xD
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str w2, [x1, #UTXD]
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2:
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/* Check if the transmit FIFO is full */
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ldr w2, [x1, #UTS]
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tbz w2, #6, 2b
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str w0, [x1, #UTXD]
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ret
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putc_error:
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mov w0, #-1
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ret
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endfunc console_imx_uart_putc
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func console_imx_uart_getc
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ldr x0, [x0, #CONSOLE_T_DRVDATA]
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cbz x0, getc_error
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1:
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ldr w1, [x0, #UTS]
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tbnz w1, #5, 1b
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ldr w1, [x0, #URXD]
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and w0, w1, #URXD_RX_DATA
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ret
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getc_error:
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mov w0, #-1
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ret
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endfunc console_imx_uart_getc
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func console_imx_uart_flush
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mov x0, #0
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ret
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endfunc console_imx_uart_flush
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