Signed-off-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
---
arch/mips/Kconfig | 1 +
arch/mips/ar231x/Makefile | 2 ++
arch/mips/ar231x/early_printk.c | 45 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 48 insertions(+)
create mode 100644 arch/mips/ar231x/early_printk.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index bd81f7a..b89bfdf 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -83,6 +83,7 @@ config AR231X
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_32BIT_KERNEL
select ARCH_REQUIRE_GPIOLIB
+ select SYS_HAS_EARLY_PRINTK
help
Support for Atheros AR231x and Atheros AR531x based boards
diff --git a/arch/mips/ar231x/Makefile b/arch/mips/ar231x/Makefile
index 201b7d4..eabad7d 100644
--- a/arch/mips/ar231x/Makefile
+++ b/arch/mips/ar231x/Makefile
@@ -10,5 +10,7 @@
obj-y += board.o prom.o devices.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+
obj-$(CONFIG_SOC_AR5312) += ar5312.o
obj-$(CONFIG_SOC_AR2315) += ar2315.o
diff --git a/arch/mips/ar231x/early_printk.c b/arch/mips/ar231x/early_printk.c
new file mode 100644
index 0000000..393c5ab
--- /dev/null
+++ b/arch/mips/ar231x/early_printk.c
@@ -0,0 +1,45 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2010 Gabor Juhos <juhosg@xxxxxxxxxxx>
+ */
+
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+
+#include <ar2315_regs.h>
+#include <ar5312_regs.h>
+#include "devices.h"
+
+static inline void prom_uart_wr(void __iomem *base, unsigned reg,
+ unsigned char ch)
+{
+ __raw_writel(ch, base + 4 * reg);
+}
+
+static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
+{
+ return __raw_readl(base + 4 * reg);
+}
+
+void prom_putchar(unsigned char ch)
+{
+ static void __iomem *base;
+
+ if (unlikely(base == NULL)) {
+ if (is_2315())
+ base = (void __iomem *)(KSEG1ADDR(AR2315_UART0));
+ else
+ base = (void __iomem *)(KSEG1ADDR(AR5312_UART0));
+ }
+
+ while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
+ ;
+ prom_uart_wr(base, UART_TX, ch);
+ while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
+ ;
+}
+
--
1.8.1.5
