alistair23-linux/arch/arm/include/debug/pl01x.S
Jun Nie 58d0398535 ARM: zx: add low level debug support for zx296702
Use the UART0 peripheral for low level debug. Only the UART port 0 is
currently supported.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2015-05-15 21:49:27 +02:00

46 lines
1,004 B
ArmAsm

/* arch/arm/include/debug/pl01x.S
*
* Debugging macro include header
*
* Copyright (C) 1994-1999 Russell King
* Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
*
* 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.
*
*/
#include <linux/amba/serial.h>
#ifdef CONFIG_DEBUG_ZTE_ZX
#undef UART01x_DR
#undef UART01x_FR
#define UART01x_DR 0x04
#define UART01x_FR 0x14
#endif
#ifdef CONFIG_DEBUG_UART_PHYS
.macro addruart, rp, rv, tmp
ldr \rp, =CONFIG_DEBUG_UART_PHYS
ldr \rv, =CONFIG_DEBUG_UART_VIRT
.endm
#endif
.macro senduart,rd,rx
strb \rd, [\rx, #UART01x_DR]
.endm
.macro waituart,rd,rx
1001: ldr \rd, [\rx, #UART01x_FR]
ARM_BE8( rev \rd, \rd )
tst \rd, #UART01x_FR_TXFF
bne 1001b
.endm
.macro busyuart,rd,rx
1001: ldr \rd, [\rx, #UART01x_FR]
ARM_BE8( rev \rd, \rd )
tst \rd, #UART01x_FR_BUSY
bne 1001b
.endm