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43 lines · 1.1 KiB

1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) STMicroelectronics SA 2017 - All Rights Reserved
4 * Author: Gerald Baeza <gerald.baeza@st.com> 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
341001: 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
401001: 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