2014-09-01 02:06:32 +00:00
|
|
|
/*
|
|
|
|
|
* arch/arm/include/debug/8250.S
|
|
|
|
|
*
|
|
|
|
|
* Copyright (C) 1994-2013 Russell King
|
|
|
|
|
*
|
2014-09-01 02:06:33 +00:00
|
|
|
* SPDX-License-Identifier: GPL-2.0+
|
2014-09-01 02:06:32 +00:00
|
|
|
*/
|
|
|
|
|
#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
|
|
|
|
|
str \rd, \rx
|
|
|
|
|
.endm
|
|
|
|
|
|
|
|
|
|
.macro load, rd, rx:vararg
|
|
|
|
|
ldr \rd, \rx
|
|
|
|
|
.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
|
