1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com> 4 */ 5 6 #include <common.h> 7 #include <asm/io.h> 8 #include <asm/addrspace.h> 9 #include <asm/types.h> 10 #include <mach/ar71xx_regs.h> 11 #include <mach/ddr.h> 12 #include <mach/ath79.h> 13 #include <debug_uart.h> 14 15 #ifdef CONFIG_DEBUG_UART_BOARD_INIT 16 void board_debug_uart_init(void) 17 { 18 void __iomem *regs; 19 u32 val; 20 21 regs = map_physmem(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE, 22 MAP_NOCACHE); 23 24 /* 25 * GPIO9 as input, GPIO10 as output 26 */ 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); 31 32 /* 33 * Enable UART, GPIO9 as UART_SI, GPIO10 as UART_SO 34 */ 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); 38 } 39 #endif 40 41 int board_early_init_f(void) 42 { 43 ddr_init(); 44 ath79_eth_reset(); 45 return 0; 46 } 47