rk29: add early printk support

arch/arm/mach-rk29/Makefile

@@ -1,4 +1,8 @@
 obj-y += timer.o io.o devices.o iomux.o clock.o rk29-pl330.o dma.o gpio.o ddr.o sram.o memcpy_dma.o reset.o
+obj-y += early_printk.o
+ifndef CONFIG_DEBUG_LL
+obj-y += ../kernel/debug.o
+endif
 obj-$(CONFIG_PM) += pm.o
 obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_RK29_VPU) += vpu.o vpu_mem.o

arch/arm/mach-rk29/clock.c

@@ -2270,9 +2270,7 @@ static void __init clk_enable_init_clocks(void)
 	clk_enable_nolock(&clk_ddr);
 	clk_enable_nolock(&clk_debug);
 	clk_enable_nolock(&clk_jtag);
-#ifdef CONFIG_DEBUG_LL
 	clk_enable_nolock(&clk_uart1);
-#endif
 }
 
 static int __init clk_disable_unused(void)

arch/arm/mach-rk29/early_printk.c

@@ -0,0 +1,46 @@
+/*
+ *  arch/arm/mach-rk29/early_printk.c
+ *
+ *  Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+
+#ifndef CONFIG_DEBUG_LL
+extern void printch(int);
+
+static void early_write(const char *s, unsigned n)
+{
+	while (n-- > 0) {
+		if (*s == '\n')
+			printch('\r');
+		printch(*s);
+		s++;
+	}
+}
+
+static void early_console_write(struct console *con, const char *s, unsigned n)
+{
+	early_write(s, n);
+}
+
+static struct console early_console = {
+	.name =		"earlycon",
+	.write =	early_console_write,
+	.flags =	CON_PRINTBUFFER | CON_BOOT,
+	.index =	-1,
+};
+#endif
+
+void __init rk29_setup_early_printk(void)
+{
+#ifndef CONFIG_DEBUG_LL
+	register_console(&early_console);
+#endif
+}

arch/arm/mach-rk29/include/mach/board.h

@@ -197,7 +197,7 @@ struct akm8975_platform_data {
 	int gpio_DRDY;
 };
 
-
+void __init rk29_setup_early_printk(void);
 void __init rk29_map_common_io(void);
 void __init rk29_clock_init(void);