| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 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 | #define STM32_UART_BASE 0x40011000 /* USART1 */ |
| 8 | |
| 9 | #ifdef CONFIG_STM32F4_DEBUG_UART |
| 10 | #define STM32_USART_SR_OFF 0x00 |
| 11 | #define STM32_USART_TDR_OFF 0x04 |
| 12 | #endif |
| 13 | |
| 14 | #ifdef CONFIG_STM32F7_DEBUG_UART |
| 15 | #define STM32_USART_SR_OFF 0x1C |
| 16 | #define STM32_USART_TDR_OFF 0x28 |
| 17 | #endif |
| 18 | |
| 19 | #define STM32_USART_TC (1 << 6) /* Tx complete */ |
| 20 | #define STM32_USART_TXE (1 << 7) /* Tx data reg empty */ |
| 21 | |
| 22 | .macro addruart, rp, rv, tmp |
| 23 | ldr \rp, =STM32_UART_BASE @ physical base |
| 24 | ldr \rv, =STM32_UART_BASE @ virt base /* NoMMU */ |
| 25 | .endm |
| 26 | |
| 27 | .macro senduart,rd,rx |
| 28 | strb \rd, [\rx, #STM32_USART_TDR_OFF] |
| 29 | .endm |
| 30 | |
| 31 | .macro waituart,rd,rx |
| 32 | 1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register |
| 33 | tst \rd, #STM32_USART_TXE @ TXE = 1 = tx empty |
| 34 | beq 1001b |
| 35 | .endm |
| 36 | |
| 37 | .macro busyuart,rd,rx |
| 38 | 1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register |
| 39 | tst \rd, #STM32_USART_TC @ TC = 1 = tx complete |
| 40 | beq 1001b |
| 41 | .endm |