mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
494e492dd8
This implements output of debug messages on efm32 SoCs. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
46 lines
1.0 KiB
ArmAsm
46 lines
1.0 KiB
ArmAsm
/*
|
|
* Copyright (C) 2013 Pengutronix
|
|
* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
|
|
*
|
|
* 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 UARTn_CMD 0x000c
|
|
#define UARTn_CMD_TXEN 0x0004
|
|
|
|
#define UARTn_STATUS 0x0010
|
|
#define UARTn_STATUS_TXC 0x0020
|
|
#define UARTn_STATUS_TXBL 0x0040
|
|
|
|
#define UARTn_TXDATA 0x0034
|
|
|
|
.macro addruart, rx, tmp
|
|
ldr \rx, =(CONFIG_DEBUG_UART_PHYS)
|
|
|
|
/*
|
|
* enable TX. The driver might disable it to save energy. We
|
|
* don't care about disabling at the end as during debug power
|
|
* consumption isn't that important.
|
|
*/
|
|
ldr \tmp, =(UARTn_CMD_TXEN)
|
|
str \tmp, [\rx, #UARTn_CMD]
|
|
.endm
|
|
|
|
.macro senduart,rd,rx
|
|
strb \rd, [\rx, #UARTn_TXDATA]
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
1001: ldr \rd, [\rx, #UARTn_STATUS]
|
|
tst \rd, #UARTn_STATUS_TXBL
|
|
beq 1001b
|
|
.endm
|
|
|
|
.macro busyuart,rd,rx
|
|
1001: ldr \rd, [\rx, UARTn_STATUS]
|
|
tst \rd, #UARTn_STATUS_TXC
|
|
bne 1001b
|
|
.endm
|