[MIPS] Early printk for IP27.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -606,6 +606,7 @@ config SGI_IP27
 	select ARC64
 	select BOOT_ELF64
 	select DMA_IP27
+	select EARLY_PRINTK
 	select HW_HAS_PCI
 	select PCI_DOMAINS
 	select SYS_HAS_CPU_R10000

arch/mips/sgi-ip27/Makefile

@@ -2,10 +2,11 @@
 # Makefile for the IP27 specific kernel interface routines under Linux.
 #
 
-obj-y	:= ip27-berr.o ip27-console.o ip27-irq.o ip27-init.o \
-	   ip27-klconfig.o ip27-klnuma.o ip27-memory.o ip27-nmi.o ip27-reset.o \
-	   ip27-timer.o ip27-hubio.o ip27-xtalk.o
+obj-y	:= ip27-berr.o ip27-irq.o ip27-init.o ip27-klconfig.o ip27-klnuma.o \
+	   ip27-memory.o ip27-nmi.o ip27-reset.o ip27-timer.o ip27-hubio.o \
+	   ip27-xtalk.o
 
+obj-$(CONFIG_EARLY_PRINTK)	+= ip27-console.o
 obj-$(CONFIG_KGDB)		+= ip27-dbgio.o
 obj-$(CONFIG_SMP)		+= ip27-smp.o
 

arch/mips/sgi-ip27/ip27-console.c

@@ -46,33 +46,29 @@ void prom_putchar(char c)
 	uart->iu_thr = c;
 }
 
-char __init prom_getchar(void)
+static void ioc3_console_write(struct console *con, const char *s, unsigned n)
 {
-	return 0;
+	while (n-- && *s) {
+		if (*s == '\n')
+			prom_putchar('\r');
+		prom_putchar(*s);
+		s++;
+	}
 }
 
-static void inline ioc3_console_probe(void)
-{
-	struct uart_port up;
-
-	/*
-	 * Register to interrupt zero because we share the interrupt with
-	 * the serial driver which we don't properly support yet.
-	 */
-	memset(&up, 0, sizeof(up));
-	up.membase	= (unsigned char *) console_uart();
-	up.irq		= 0;
-	up.uartclk	= IOC3_CLK;
-	up.regshift	= 0;
-	up.iotype	= UPIO_MEM;
-	up.flags	= IOC3_FLAGS;
-	up.line		= 0;
+static struct console ioc3_console = {
+	.name	= "ioc3",
+	.write	= ioc3_console_write,
+	.flags	= CON_PRINTBUFFER | CON_BOOT,
+	.index	= -1
+};
 
-	if (early_serial_setup(&up))
-		printk(KERN_ERR "Early serial init of port 0 failed\n");
+__init void ip27_setup_console(void)
+{
+	register_console(&ioc3_console);
 }
 
-__init void ip27_setup_console(void)
+void __init disable_early_printk(void)
 {
-	ioc3_console_probe();
+	unregister_console(&ioc3_console);
 }