1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
8 #include <asm/addrspace.h>
10 #include <mach/ar71xx_regs.h>
12 #include <mach/ath79.h>
13 #include <debug_uart.h>
15 #ifdef CONFIG_DEBUG_UART_BOARD_INIT
16 void board_debug_uart_init(void)
21 regs = map_physmem(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE,
25 * GPIO9 as input, GPIO10 as output
27 val = readl(regs + AR71XX_GPIO_REG_OE);
28 val &= ~AR933X_GPIO(9);
29 val |= AR933X_GPIO(10);
30 writel(val, regs + AR71XX_GPIO_REG_OE);
33 * Enable UART, GPIO9 as UART_SI, GPIO10 as UART_SO
35 val = readl(regs + AR71XX_GPIO_REG_FUNC);
36 val |= AR933X_GPIO_FUNC_UART_EN | AR933X_GPIO_FUNC_RES_TRUE;
37 writel(val, regs + AR71XX_GPIO_REG_FUNC);
41 int board_early_init_f(void)