stm32.S (1162B)
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