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

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/*

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 * Renesas SCIF(A) debugging macro include header

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 *

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 * Based on r8a7790.S

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 *

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 * Copyright (C) 2012-2013 Renesas Electronics Corporation

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 * Copyright (C) 1994-1999 Russell King

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 */

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#define SCIF_PHYS	CONFIG_DEBUG_UART_PHYS

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#define SCIF_VIRT	((SCIF_PHYS & 0x00ffffff) | 0xfd000000)

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#if defined(CONFIG_DEBUG_R7S9210_SCIF2) || defined(CONFIG_DEBUG_R7S9210_SCIF4)

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/* RZ/A2 SCIFA */

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#define FTDR		0x06

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#define FSR		0x08

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#elif CONFIG_DEBUG_UART_PHYS < 0xe6e00000

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/* SCIFA */

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#define FTDR		0x20

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#define FSR		0x14

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#else

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/* SCIF */

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#define FTDR		0x0c

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#define FSR		0x10

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#endif

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#define TDFE	(1 << 5)

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#define TEND	(1 << 6)

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	.macro	addruart, rp, rv, tmp

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	ldr	\rp, =SCIF_PHYS

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	ldr	\rv, =SCIF_VIRT

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	.endm

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	.macro	waituartcts,rd,rx

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	.endm

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	.macro	waituarttxrdy, rd, rx

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1001:	ldrh	\rd, [\rx, #FSR]

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	tst	\rd, #TDFE

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	beq	1001b

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	.endm

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	.macro	senduart, rd, rx

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	strb	\rd, [\rx, #FTDR]

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	ldrh	\rd, [\rx, #FSR]

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	bic	\rd, \rd, #TEND

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	strh	\rd, [\rx, #FSR]

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	.endm

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	.macro	busyuart, rd, rx

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1001:	ldrh	\rd, [\rx, #FSR]

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	tst	\rd, #TEND

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	beq	1001b

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	.endm

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