m68k/mvme16x: Adopt common boot console

In a multi-platform kernel binary we only need one early console instance.

The difficulty here is that the common early console is started by
early_param(), whereas the MVME16x instance is started later by
config_mvme16x(). That means some interrupt setup must be done earlier.
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Tested-by: NStephen N Chivers <schivers@csc.com.au>
[Geert] Tag debug_cons_write() with __ref to kill section mismatch warning
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/kernel/early_printk.c

@@ -12,12 +12,21 @@
 #include <linux/string.h>
 #include <asm/setup.h>
 
+extern void mvme16x_cons_write(struct console *co,
+			       const char *str, unsigned count);
+
 asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
 
-static void debug_cons_write(struct console *c,
-			     const char *s, unsigned n)
+static void __ref debug_cons_write(struct console *c,
+				   const char *s, unsigned n)
 {
-	debug_cons_nputs(s, n);
+#if !(defined(CONFIG_SUN3)   || defined(CONFIG_M68360) || \
+      defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE))
+	if (MACH_IS_MVME16x)
+		mvme16x_cons_write(c, s, n);
+	else
+		debug_cons_nputs(s, n);
+#endif
 }
 
 static struct console early_console_instance = {
@@ -29,10 +38,6 @@ static struct console early_console_instance = {
 
 static int __init setup_early_printk(char *buf)
 {
-	/* MVME16x registers an early console after interrupt setup. */
-	if (MACH_IS_MVME16x)
-		return 0;
-
 	if (early_console || buf)
 		return 0;
 
@@ -52,7 +57,7 @@ early_param("earlyprintk", setup_early_printk);
 
 static int __init unregister_early_console(void)
 {
-	if (!early_console)
+	if (!early_console || MACH_IS_MVME16x)
 		return 0;
 
 	return unregister_console(early_console);

arch/m68k/kernel/head.S

@@ -2936,6 +2936,15 @@ L(serial_init_not_mac):
 2:
 #endif
 
+#ifdef CONFIG_MVME16x
+	is_not_mvme16x(L(serial_init_not_mvme16x))
+	moveb	#0x10,M167_PCSCCMICR
+	moveb	#0x10,M167_PCSCCTICR
+	moveb	#0x10,M167_PCSCCRICR
+	jra	L(serial_init_done)
+L(serial_init_not_mvme16x):
+#endif
+
 #ifdef CONFIG_APOLLO
 /* We count on the PROM initializing SIO1 */
 #endif
@@ -3768,7 +3777,9 @@ M167_CYIER = 0xfff45011
 M167_CYLICR = 0xfff45026
 M167_CYTEOIR = 0xfff45085
 M167_CYTDR = 0xfff450f8
+M167_PCSCCMICR = 0xfff4201d
 M167_PCSCCTICR = 0xfff4201e
+M167_PCSCCRICR = 0xfff4201f
 M167_PCTPIACKR = 0xfff42025
 #endif
 

arch/m68k/mvme16x/config.c

@@ -213,7 +213,7 @@ static void __init mvme16x_init_IRQ (void)
 #define CySCRH		(0x22)
 #define CyTFTC		(0x80)
 
-static void cons_write(struct console *co, const char *str, unsigned count)
+void mvme16x_cons_write(struct console *co, const char *str, unsigned count)
 {
 	volatile unsigned char *base_addr = (u_char *)CD2401_ADDR;
 	volatile u_char sink;
@@ -268,20 +268,6 @@ static void cons_write(struct console *co, const char *str, unsigned count)
 	base_addr[CyIER] = ier;
 }
 
-static struct console cons_info =
-{
-	.name	= "sercon",
-	.write	= cons_write,
-	.flags	= CON_PRINTBUFFER | CON_BOOT,
-	.index	= -1,
-};
-
-static void __init mvme16x_early_console(void)
-{
-	register_console(&cons_info);
-
-	printk(KERN_INFO "MVME16x: early console registered\n");
-}
 #endif
 
 void __init config_mvme16x(void)
@@ -336,16 +322,6 @@ void __init config_mvme16x(void)
     else
     {
 	mvme16x_config = MVME16x_CONFIG_GOT_LP | MVME16x_CONFIG_GOT_CD2401;
-
-	/* Dont allow any interrupts from the CD2401 until the interrupt */
-	/* handlers are installed					 */
-
-	pcc2chip[PccSCCMICR] = 0x10;
-	pcc2chip[PccSCCTICR] = 0x10;
-	pcc2chip[PccSCCRICR] = 0x10;
-#ifdef CONFIG_EARLY_PRINTK
-	mvme16x_early_console();
-#endif
     }
 }