mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 22:44:27 +08:00
d8a00916b3
Add the UART definitions needed to support earlyprintk for MesonX SoCs on UARTAO. Signed-off-by: Carlo Caione <carlo@caione.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
36 lines
878 B
ArmAsm
36 lines
878 B
ArmAsm
/*
|
|
* Copyright (C) 2014 Carlo Caione
|
|
* Carlo Caione <carlo@caione.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#define MESON_AO_UART_WFIFO 0x0
|
|
#define MESON_AO_UART_STATUS 0xc
|
|
|
|
#define MESON_AO_UART_TX_FIFO_EMPTY (1 << 22)
|
|
#define MESON_AO_UART_TX_FIFO_FULL (1 << 21)
|
|
|
|
.macro addruart, rp, rv, tmp
|
|
ldr \rp, =(CONFIG_DEBUG_UART_PHYS) @ physical
|
|
ldr \rv, =(CONFIG_DEBUG_UART_VIRT) @ virtual
|
|
.endm
|
|
|
|
.macro senduart,rd,rx
|
|
str \rd, [\rx, #MESON_AO_UART_WFIFO]
|
|
.endm
|
|
|
|
.macro busyuart,rd,rx
|
|
1002: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
|
|
tst \rd, #MESON_AO_UART_TX_FIFO_EMPTY
|
|
beq 1002b
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
1001: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
|
|
tst \rd, #MESON_AO_UART_TX_FIFO_FULL
|
|
bne 1001b
|
|
.endm
|