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-rw-r--r--arch/arm/include/debug/stm32.S43
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