diff options
Diffstat (limited to 'arch/arm/include/debug/stm32.S')
| -rw-r--r-- | arch/arm/include/debug/stm32.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/include/debug/stm32.S b/arch/arm/include/debug/stm32.S new file mode 100644 index 000000000..b6d9df30e --- /dev/null +++ b/arch/arm/include/debug/stm32.S @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) STMicroelectronics SA 2017 - All Rights Reserved + * Author: Gerald Baeza <gerald.baeza@st.com> for STMicroelectronics. + */ + +#ifdef CONFIG_STM32F4_DEBUG_UART +#define STM32_USART_SR_OFF 0x00 +#define STM32_USART_TDR_OFF 0x04 +#endif + +#if defined(CONFIG_STM32F7_DEBUG_UART) || defined(CONFIG_STM32H7_DEBUG_UART) || \ + defined(CONFIG_STM32MP1_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, =CONFIG_DEBUG_UART_PHYS @ physical base + ldr \rv, =CONFIG_DEBUG_UART_VIRT @ virt base +.endm + +.macro senduart,rd,rx + strb \rd, [\rx, #STM32_USART_TDR_OFF] +.endm + +.macro waituartcts,rd,rx +.endm + +.macro waituarttxrdy,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 |