arch/arm/include/debug/stm32.S

   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 #ifdef CONFIG_STM32F4_DEBUG_UART
   8 #define STM32_USART_SR_OFF              0x00
   9 #define STM32_USART_TDR_OFF             0x04
  10 #endif
  11
  12 #if defined(CONFIG_STM32F7_DEBUG_UART) || defined(CONFIG_STM32H7_DEBUG_UART) || \
  13         defined(CONFIG_STM32MP1_DEBUG_UART)
  14 #define STM32_USART_SR_OFF              0x1C
  15 #define STM32_USART_TDR_OFF             0x28
  16 #endif
  17
  18 #define STM32_USART_TC                  (1 << 6)        /* Tx complete       */
  19 #define STM32_USART_TXE                 (1 << 7)        /* Tx data reg empty */
  20
  21 .macro  addruart, rp, rv, tmp
  22         ldr     \rp, =CONFIG_DEBUG_UART_PHYS @ physical base
  23         ldr     \rv, =CONFIG_DEBUG_UART_VIRT @ virt base
  24 .endm
  25
  26 .macro  senduart,rd,rx
  27         strb    \rd, [\rx, #STM32_USART_TDR_OFF]
  28 .endm
  29
  30 .macro  waituart,rd,rx
  31 1001:   ldr     \rd, [\rx, #(STM32_USART_SR_OFF)]       @ Read Status Register
  32         tst     \rd, #STM32_USART_TXE                   @ TXE = 1 = tx empty
  33         beq     1001b
  34 .endm
  35
  36 .macro  busyuart,rd,rx
  37 1001:   ldr     \rd, [\rx, #(STM32_USART_SR_OFF)]       @ Read Status Register
  38         tst     \rd, #STM32_USART_TC                    @ TC = 1 = tx complete
  39         beq     1001b
  40 .endm