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