1 /* 2 * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/io.h> 9 #include <asm/addrspace.h> 10 #include <asm/types.h> 11 #include <mach/ar71xx_regs.h> 12 #include <mach/ddr.h> 13 #include <debug_uart.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 #ifdef CONFIG_DEBUG_UART_BOARD_INIT 18 void board_debug_uart_init(void) 19 { 20 void __iomem *regs; 21 u32 val; 22 23 regs = map_physmem(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE, 24 MAP_NOCACHE); 25 26 /* 27 * GPIO9 as input, GPIO10 as output 28 */ 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); 33 34 /* 35 * Enable UART, GPIO9 as UART_SI, GPIO10 as UART_SO 36 */ 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); 40 } 41 #endif 42 43 int board_early_init_f(void) 44 { 45 #ifdef CONFIG_DEBUG_UART 46 debug_uart_init(); 47 #endif 48 ddr_init(); 49 return 0; 50 } 51