| /* |
| * Atheros AR71XX/AR724X/AR913X SoC early printk support |
| * |
| * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org> |
| * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| */ |
| |
| #include <linux/io.h> |
| #include <linux/serial_reg.h> |
| #include <asm/addrspace.h> |
| |
| #include <asm/mach-ath79/ar71xx_regs.h> |
| |
| static inline void prom_wait_thre(void __iomem *base) |
| { |
| u32 lsr; |
| |
| do { |
| lsr = __raw_readl(base + UART_LSR * 4); |
| if (lsr & UART_LSR_THRE) |
| break; |
| } while (1); |
| } |
| |
| void prom_putchar(unsigned char ch) |
| { |
| void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); |
| |
| prom_wait_thre(base); |
| __raw_writel(ch, base + UART_TX * 4); |
| prom_wait_thre(base); |
| } |