linux/arch/arm/include/debug/meson.S
Carlo Caione d8a00916b3 ARM: meson: debug: add debug UART for earlyprintk support
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>
2014-09-25 17:31:53 +02:00

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