You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
1.9 KiB
68 lines
1.9 KiB
From 5fff610b7c60195de98e68bec00c357f393ce634 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
Date: Sun, 20 Jan 2013 22:02:55 +0100
|
|
Subject: [PATCH 07/14] MIPS: ralink: adds early_printk support
|
|
|
|
Add the code needed to make early printk work.
|
|
|
|
Signed-off-by: John Crispin <blogic@openwrt.org>
|
|
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
|
|
Patchwork: http://patchwork.linux-mips.org/patch/4897/
|
|
---
|
|
arch/mips/ralink/early_printk.c | 44 +++++++++++++++++++++++++++++++++++++++
|
|
1 file changed, 44 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..c4ae47e
|
|
--- /dev/null
|
|
+++ b/arch/mips/ralink/early_printk.c
|
|
@@ -0,0 +1,44 @@
|
|
+/*
|
|
+ * 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 <juhosg@openwrt.org>
|
|
+ */
|
|
+
|
|
+#include <linux/io.h>
|
|
+#include <linux/serial_reg.h>
|
|
+
|
|
+#include <asm/addrspace.h>
|
|
+
|
|
+#define EARLY_UART_BASE 0x10000c00
|
|
+
|
|
+#define UART_REG_RX 0x00
|
|
+#define UART_REG_TX 0x04
|
|
+#define UART_REG_IER 0x08
|
|
+#define UART_REG_IIR 0x0c
|
|
+#define UART_REG_FCR 0x10
|
|
+#define UART_REG_LCR 0x14
|
|
+#define UART_REG_MCR 0x18
|
|
+#define UART_REG_LSR 0x1c
|
|
+
|
|
+static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
|
|
+
|
|
+static inline void uart_w32(u32 val, unsigned reg)
|
|
+{
|
|
+ __raw_writel(val, uart_membase + reg);
|
|
+}
|
|
+
|
|
+static inline u32 uart_r32(unsigned reg)
|
|
+{
|
|
+ return __raw_readl(uart_membase + reg);
|
|
+}
|
|
+
|
|
+void prom_putchar(unsigned char ch)
|
|
+{
|
|
+ while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
|
|
+ ;
|
|
+ uart_w32(ch, UART_REG_TX);
|
|
+ while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
|
|
+ ;
|
|
+}
|
|
--
|
|
1.7.10.4
|
|
|
|
|