2 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
4 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm/addrspace.h>
10 #include <asm/types.h>
11 #include <mach/ar71xx_regs.h>
13 #include <debug_uart.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 #ifdef CONFIG_DEBUG_UART_BOARD_INIT
18 void board_debug_uart_init(void)
23 regs = map_physmem(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE,
27 * GPIO9 as input, GPIO10 as output
29 val = readl(regs + AR71XX_GPIO_REG_OE);
30 val &= ~AR933X_GPIO(9);
31 val |= AR933X_GPIO(10);
32 writel(val, regs + AR71XX_GPIO_REG_OE);
35 * Enable UART, GPIO9 as UART_SI, GPIO10 as UART_SO
37 val = readl(regs + AR71XX_GPIO_REG_FUNC);
38 val |= AR933X_GPIO_FUNC_UART_EN | AR933X_GPIO_FUNC_RES_TRUE;
39 writel(val, regs + AR71XX_GPIO_REG_FUNC);
43 int board_early_init_f(void)
45 #ifdef CONFIG_DEBUG_UART