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63 lines
1.8 KiB
Diff
63 lines
1.8 KiB
Diff
From 5fff610b7c60195de98e68bec00c357f393ce634 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 20 Jan 2013 22:02:55 +0100
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Subject: [PATCH 07/14] MIPS: ralink: adds early_printk support
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Add the code needed to make early printk work.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Patchwork: http://patchwork.linux-mips.org/patch/4897/
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---
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arch/mips/ralink/early_printk.c | 44 +++++++++++++++++++++++++++++++++++++++
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1 file changed, 44 insertions(+)
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create mode 100644 arch/mips/ralink/early_printk.c
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--- /dev/null
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+++ b/arch/mips/ralink/early_printk.c
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@@ -0,0 +1,44 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
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+ */
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+
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+#include <linux/io.h>
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+#include <linux/serial_reg.h>
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+
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+#include <asm/addrspace.h>
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+
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+#define EARLY_UART_BASE 0x10000c00
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+
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+#define UART_REG_RX 0x00
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+#define UART_REG_TX 0x04
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+#define UART_REG_IER 0x08
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+#define UART_REG_IIR 0x0c
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+#define UART_REG_FCR 0x10
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+#define UART_REG_LCR 0x14
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+#define UART_REG_MCR 0x18
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+#define UART_REG_LSR 0x1c
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+
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+static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
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+
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+static inline void uart_w32(u32 val, unsigned reg)
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+{
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+ __raw_writel(val, uart_membase + reg);
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+}
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+
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+static inline u32 uart_r32(unsigned reg)
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+{
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+ return __raw_readl(uart_membase + reg);
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+}
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+
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+void prom_putchar(unsigned char ch)
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+{
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+ while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
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+ ;
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+ uart_w32(ch, UART_REG_TX);
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+ while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
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+ ;
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+}
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