blob: e22bbbdf0fecfaffa73cd4590f0144dfb6303bca (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
From 4efba82d0e4059588f2b2fc0ac2576eaf37f1d22 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 20 Jan 2013 22:02:55 +0100
Subject: [PATCH 07/79] 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
|
