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68 lines
1.7 KiB
68 lines
1.7 KiB
--- /dev/null
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+++ b/arch/mips/ar231x/early_printk.c
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@@ -0,0 +1,44 @@
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+/*
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+ * This file is subject to the terms and conditions of the GNU General Public
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+ * License. See the file "COPYING" in the main directory of this archive
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+ * for more details.
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+ *
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+ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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+ */
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+
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+#include <linux/mm.h>
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+#include <linux/io.h>
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+#include <linux/serial_reg.h>
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+#include <asm/addrspace.h>
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+
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+#include <asm/mach-ar231x/ar2315_regs.h>
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+#include <asm/mach-ar231x/ar5312_regs.h>
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+#include "devices.h"
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+
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+static inline void prom_uart_wr(void __iomem *base, unsigned reg,
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+ unsigned char ch)
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+{
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+ __raw_writeb(ch, base + 4 * reg);
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+}
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+
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+static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
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+{
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+ return __raw_readb(base + 4 * 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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+ static void __iomem *base;
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+
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+ if (unlikely(base == NULL)) {
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+ if (is_2315())
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+ base = (void __iomem *)(KSEG1ADDR(AR2315_UART0));
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+ else
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+ base = (void __iomem *)(KSEG1ADDR(AR531X_UART0));
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+ }
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+
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+ while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0);
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+ prom_uart_wr(base, UART_TX, ch);
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+ while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0);
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+}
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+
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--- a/arch/mips/ar231x/Makefile
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+++ b/arch/mips/ar231x/Makefile
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@@ -9,5 +9,8 @@
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#
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obj-y += board.o prom.o devices.o
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+
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+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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+
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obj-$(CONFIG_ATHEROS_AR5312) += ar5312.o
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obj-$(CONFIG_ATHEROS_AR2315) += ar2315.o
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -130,6 +130,7 @@ config ATHEROS_AR231X
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select SYS_SUPPORTS_BIG_ENDIAN
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select SYS_SUPPORTS_32BIT_KERNEL
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select ARCH_REQUIRE_GPIOLIB
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+ select SYS_HAS_EARLY_PRINTK
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help
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Support for AR231x and AR531x based boards
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