6ef4e47926
If the 8250 debug code is used in word mode on an big endian host then the writes need to be change into little endian for the bus. Note, we have to re-convert the value back as the debug code will inspect the value after writing it to see if a newline has been written. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
58 lines
1.2 KiB
ArmAsm
58 lines
1.2 KiB
ArmAsm
/*
|
|
* arch/arm/include/debug/8250.S
|
|
*
|
|
* Copyright (C) 1994-2013 Russell King
|
|
*
|
|
* 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/serial_reg.h>
|
|
|
|
.macro addruart, rp, rv, tmp
|
|
ldr \rp, =CONFIG_DEBUG_UART_PHYS
|
|
ldr \rv, =CONFIG_DEBUG_UART_VIRT
|
|
.endm
|
|
|
|
#ifdef CONFIG_DEBUG_UART_8250_WORD
|
|
.macro store, rd, rx:vararg
|
|
ARM_BE8(rev \rd, \rd)
|
|
str \rd, \rx
|
|
ARM_BE8(rev \rd, \rd)
|
|
.endm
|
|
|
|
.macro load, rd, rx:vararg
|
|
ldr \rd, \rx
|
|
ARM_BE8(rev \rd, \rd)
|
|
.endm
|
|
#else
|
|
.macro store, rd, rx:vararg
|
|
strb \rd, \rx
|
|
.endm
|
|
|
|
.macro load, rd, rx:vararg
|
|
ldrb \rd, \rx
|
|
.endm
|
|
#endif
|
|
|
|
#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
|
|
|
|
.macro senduart,rd,rx
|
|
store \rd, [\rx, #UART_TX << UART_SHIFT]
|
|
.endm
|
|
|
|
.macro busyuart,rd,rx
|
|
1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
|
|
and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
|
|
teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
|
|
bne 1002b
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
#ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL
|
|
1001: load \rd, [\rx, #UART_MSR << UART_SHIFT]
|
|
tst \rd, #UART_MSR_CTS
|
|
beq 1001b
|
|
#endif
|
|
.endm
|