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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/include/debug/8250.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * arch/arm/include/debug/8250.S

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 *

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 *  Copyright (C) 1994-2013 Russell King

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 */

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#include <linux/serial_reg.h>

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		.macro	addruart, rp, rv, tmp

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		ldr	\rp, =CONFIG_DEBUG_UART_PHYS

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		ldr	\rv, =CONFIG_DEBUG_UART_VIRT

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		.endm

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#ifdef CONFIG_DEBUG_UART_8250_WORD

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		.macro	store, rd, rx:vararg

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	 ARM_BE8(rev \rd, \rd)

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		str	\rd, \rx

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	 ARM_BE8(rev \rd, \rd)

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		.endm

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		.macro	load, rd, rx:vararg

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		ldr	\rd, \rx

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	ARM_BE8(rev \rd, \rd)

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		.endm

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#else

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		.macro	store, rd, rx:vararg

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		strb	\rd, \rx

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		.endm

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		.macro	load, rd, rx:vararg

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		ldrb	\rd, \rx

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		.endm

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#endif

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#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT

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		.macro	senduart,rd,rx

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		store	\rd, [\rx, #UART_TX << UART_SHIFT]

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		.endm

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		.macro	busyuart,rd,rx

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1002:		load	\rd, [\rx, #UART_LSR << UART_SHIFT]

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		and	\rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE

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		teq	\rd, #UART_LSR_TEMT | UART_LSR_THRE

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		bne	1002b

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		.endm

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		.macro	waituarttxrdy,rd,rx

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		.endm

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		.macro	waituartcts,rd,rx

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1001:		load	\rd, [\rx, #UART_MSR << UART_SHIFT]

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		tst	\rd, #UART_MSR_CTS

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		beq	1001b

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		.endm

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