Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/include/debug/stm32.S
26295 views
1
/* SPDX-License-Identifier: GPL-2.0 */

2
/*

3
 * Copyright (C) STMicroelectronics SA 2017 - All Rights Reserved

4
 * Author:   Gerald Baeza <[email protected]> for STMicroelectronics.

5
 */

6


7
#ifdef CONFIG_STM32F4_DEBUG_UART

8
#define STM32_USART_SR_OFF		0x00

9
#define STM32_USART_TDR_OFF		0x04

10
#endif

11


12
#if defined(CONFIG_STM32F7_DEBUG_UART) || defined(CONFIG_STM32H7_DEBUG_UART) || \

13
	defined(CONFIG_STM32MP1_DEBUG_UART)

14
#define STM32_USART_SR_OFF		0x1C

15
#define STM32_USART_TDR_OFF		0x28

16
#endif

17


18
#define STM32_USART_TC			(1 << 6)	/* Tx complete       */

19
#define STM32_USART_TXE			(1 << 7)	/* Tx data reg empty */

20


21
.macro	addruart, rp, rv, tmp

22
	ldr	\rp, =CONFIG_DEBUG_UART_PHYS @ physical base

23
	ldr	\rv, =CONFIG_DEBUG_UART_VIRT @ virt base

24
.endm

25


26
.macro  senduart,rd,rx

27
	strb    \rd, [\rx, #STM32_USART_TDR_OFF]

28
.endm

29


30
.macro	waituartcts,rd,rx

31
.endm

32


33
.macro  waituarttxrdy,rd,rx

34
1001:	ldr	\rd, [\rx, #(STM32_USART_SR_OFF)]	@ Read Status Register

35
	tst	\rd, #STM32_USART_TXE			@ TXE = 1 = tx empty

36
	beq	1001b

37
.endm

38


39
.macro  busyuart,rd,rx

40
1001:	ldr	\rd, [\rx, #(STM32_USART_SR_OFF)]	@ Read Status Register

41
	tst	\rd, #STM32_USART_TC			@ TC = 1 = tx complete

42
	beq	1001b

43
.endm

44


45