| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) STMicroelectronics SA 2017 - All Rights Reserved |
| * Author: Gerald Baeza <gerald.baeza@st.com> for STMicroelectronics. |
| */ |
| |
| #define STM32_UART_BASE 0x40011000 /* USART1 */ |
| |
| #ifdef CONFIG_STM32F4_DEBUG_UART |
| #define STM32_USART_SR_OFF 0x00 |
| #define STM32_USART_TDR_OFF 0x04 |
| #endif |
| |
| #ifdef CONFIG_STM32F7_DEBUG_UART |
| #define STM32_USART_SR_OFF 0x1C |
| #define STM32_USART_TDR_OFF 0x28 |
| #endif |
| |
| #define STM32_USART_TC (1 << 6) /* Tx complete */ |
| #define STM32_USART_TXE (1 << 7) /* Tx data reg empty */ |
| |
| .macro addruart, rp, rv, tmp |
| ldr \rp, =STM32_UART_BASE @ physical base |
| ldr \rv, =STM32_UART_BASE @ virt base /* NoMMU */ |
| .endm |
| |
| .macro senduart,rd,rx |
| strb \rd, [\rx, #STM32_USART_TDR_OFF] |
| .endm |
| |
| .macro waituart,rd,rx |
| 1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register |
| tst \rd, #STM32_USART_TXE @ TXE = 1 = tx empty |
| beq 1001b |
| .endm |
| |
| .macro busyuart,rd,rx |
| 1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register |
| tst \rd, #STM32_USART_TC @ TC = 1 = tx complete |
| beq 1001b |
| .endm |
