1 // SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause
2 /*
3  * Copyright (C) 2022, STMicroelectronics - All Rights Reserved
4  */
5 
6 #include <config.h>
7 #include <debug_uart.h>
8 #include <asm/io.h>
9 #include <asm/arch/stm32.h>
10 #include <linux/bitops.h>
11 
12 #define RCC_MP_APB1ENSETR (STM32_RCC_BASE + 0x0A00)
13 #define RCC_MP_AHB4ENSETR (STM32_RCC_BASE + 0x0A28)
14 
15 #define GPIOG_BASE 0x50008000
16 
board_debug_uart_init(void)17 void board_debug_uart_init(void)
18 {
19 	if (CONFIG_DEBUG_UART_BASE == STM32_UART4_BASE) {
20 		/* UART4 clock enable */
21 		setbits_le32(RCC_MP_APB1ENSETR, BIT(16));
22 
23 		/* GPIOG clock enable */
24 		writel(BIT(6), RCC_MP_AHB4ENSETR);
25 		/* GPIO configuration for ST boards: Uart4 TX = G11 */
26 		writel(0xffbfffff, GPIOG_BASE + 0x00);
27 		writel(0x00006000, GPIOG_BASE + 0x24);
28 	}
29 }
30