1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * arch/arm/include/debug/8250.S
5 * Copyright (C) 1994-2013 Russell King
7 #include <linux/serial_reg.h>
9 .macro addruart, rp, rv, tmp
10 ldr \rp, =CONFIG_DEBUG_UART_PHYS
11 ldr \rv, =CONFIG_DEBUG_UART_VIRT
14 #ifdef CONFIG_DEBUG_UART_8250_WORD
15 .macro store, rd, rx:vararg
19 .macro load, rd, rx:vararg
23 .macro store, rd, rx:vararg
27 .macro load, rd, rx:vararg
32 #define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
35 store \rd, [\rx, #UART_TX << UART_SHIFT]
39 1002: load \rd, [\rx, #UART_LSR << UART_SHIFT]
40 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
41 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
46 #ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL
47 1001: load \rd, [\rx, #UART_MSR << UART_SHIFT]
48 tst \rd, #UART_MSR_CTS