| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * Copyright (C) STMicroelectronics SA 2017 - All Rights Reserved |
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| 4 | * Author: Gerald Baeza <gerald.baeza@st.com> for STMicroelectronics. |
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| 5 | */ |
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| 6 | |
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| 7 | #ifdef CONFIG_STM32F4_DEBUG_UART |
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| 8 | #define STM32_USART_SR_OFF 0x00 |
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| 9 | #define STM32_USART_TDR_OFF 0x04 |
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| 10 | #endif |
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| 11 | |
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| 12 | #if defined(CONFIG_STM32F7_DEBUG_UART) || defined(CONFIG_STM32H7_DEBUG_UART) || \ |
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| 13 | defined(CONFIG_STM32MP1_DEBUG_UART) |
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| 14 | #define STM32_USART_SR_OFF 0x1C |
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| 15 | #define STM32_USART_TDR_OFF 0x28 |
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| 16 | #endif |
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| 17 | |
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| 18 | #define STM32_USART_TC (1 << 6) /* Tx complete */ |
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| 19 | #define STM32_USART_TXE (1 << 7) /* Tx data reg empty */ |
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| 20 | |
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| 21 | .macro addruart, rp, rv, tmp |
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| 22 | ldr \rp, =CONFIG_DEBUG_UART_PHYS @ physical base |
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| 23 | ldr \rv, =CONFIG_DEBUG_UART_VIRT @ virt base |
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| 24 | .endm |
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| 25 | |
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| 26 | .macro senduart,rd,rx |
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| 27 | strb \rd, [\rx, #STM32_USART_TDR_OFF] |
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| 28 | .endm |
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| 29 | |
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| 30 | .macro waituartcts,rd,rx |
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| 31 | .endm |
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| 32 | |
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| 33 | .macro waituarttxrdy,rd,rx |
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| 34 | 1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register |
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| 35 | tst \rd, #STM32_USART_TXE @ TXE = 1 = tx empty |
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| 36 | beq 1001b |
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| 37 | .endm |
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| 38 | |
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| 39 | .macro busyuart,rd,rx |
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| 40 | 1001: ldr \rd, [\rx, #(STM32_USART_SR_OFF)] @ Read Status Register |
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| 41 | tst \rd, #STM32_USART_TC @ TC = 1 = tx complete |
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| 42 | beq 1001b |
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| 43 | .endm |
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| 44 | |
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