From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Wed, 23 Jan 2013 13:11:16 +0100 (CET) Received: from nbd.name ([46.4.11.11]:52039 "EHLO nbd.name" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S6833401Ab3AWMIp2Bw-o (ORCPT ); Wed, 23 Jan 2013 13:08:45 +0100 From: John Crispin To: Ralf Baechle Cc: linux-mips@linux-mips.org, John Crispin Subject: [RFC 08/11] MIPS: ralink: adds early_printk support Date: Wed, 23 Jan 2013 13:05:52 +0100 Message-Id: <1358942755-25371-9-git-send-email-blogic@openwrt.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1358942755-25371-1-git-send-email-blogic@openwrt.org> References: <1358942755-25371-1-git-send-email-blogic@openwrt.org> X-archive-position: 35514 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: blogic@openwrt.org Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips Return-Path: Add the code needed to make early printk work. Signed-off-by: John Crispin --- arch/mips/ralink/early_printk.c | 43 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 arch/mips/ralink/early_printk.c diff --git a/arch/mips/ralink/early_printk.c b/arch/mips/ralink/early_printk.c new file mode 100644 index 0000000..c610084 --- /dev/null +++ b/arch/mips/ralink/early_printk.c @@ -0,0 +1,43 @@ +/* + * 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. + * + * Copyright (C) 2011-2012 Gabor Juhos + */ + +#include +#include + +#include + +/* UART registers */ +#define EARLY_UART_BASE 0x10000c00 + +#define UART_REG_RX 0 +#define UART_REG_TX 1 +#define UART_REG_IER 2 +#define UART_REG_IIR 3 +#define UART_REG_FCR 4 +#define UART_REG_LCR 5 +#define UART_REG_MCR 6 +#define UART_REG_LSR 7 + +static inline void uart_w32(u32 val, unsigned reg) +{ + __raw_writel((val), + (void __iomem *)(KSEG1ADDR(EARLY_UART_BASE) + 4 * (reg))); +} + +static inline u32 uart_r32(unsigned reg) +{ + return __raw_readl( + (void __iomem *)(KSEG1ADDR(EARLY_UART_BASE) + 4 * (reg))); +} + +void prom_putchar(unsigned char ch) +{ + while (((uart_r32(UART_REG_LSR)) & UART_LSR_THRE) == 0); + uart_w32(UART_REG_TX, ch); + while (((uart_r32(UART_REG_LSR)) & UART_LSR_THRE) == 0); +} -- 1.7.10.4