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35 lines · 771 B

1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2014 Carlo Caione
4 * Carlo Caione <carlo@caione.org>
5 */
6
7#define MESON_AO_UART_WFIFO 0x0
8#define MESON_AO_UART_STATUS 0xc
9
10#define MESON_AO_UART_TX_FIFO_EMPTY (1 << 22)
11#define MESON_AO_UART_TX_FIFO_FULL (1 << 21)
12
13 .macro addruart, rp, rv, tmp
14 ldr \rp, =(CONFIG_DEBUG_UART_PHYS) @ physical
15 ldr \rv, =(CONFIG_DEBUG_UART_VIRT) @ virtual
16 .endm
17
18 .macro senduart,rd,rx
19 str \rd, [\rx, #MESON_AO_UART_WFIFO]
20 .endm
21
22 .macro busyuart,rd,rx
231002: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
24 tst \rd, #MESON_AO_UART_TX_FIFO_EMPTY
25 beq 1002b
26 .endm
27
28 .macro waituartcts,rd,rx
29 .endm
30
31 .macro waituarttxrdy,rd,rx
321001: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
33 tst \rd, #MESON_AO_UART_TX_FIFO_FULL
34 bne 1001b
35 .endm