m68k/mac: early console

Revive the old mac_serial_print() routine as mac_early_print(). mac_serial_print() did not function because it did not use the right offsets for its stack arguments. Fix this and make compilation conditional on CONFIG_EARLY_PRINTK instead of the obscure MAC_SERIAL_DEBUG macro.

Give mac_early_print() a new string length parameter to fit the early console API.

Send output to the framebuffer as well as serial ports.

Change the line rate to 38400 baud to match the default for the real (pmac_zilog) serial console.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
index c247de02bc7e..55db101dd36d 100644
--- a/arch/m68k/mac/config.c
+++ b/arch/m68k/mac/config.c
@@ -71,6 +71,31 @@ static void mac_get_model(char *str);
 static void mac_identify(void);
 static void mac_report_hardware(void);
 
+#ifdef CONFIG_EARLY_PRINTK
+asmlinkage void __init mac_early_print(const char *s, unsigned n);
+
+static void __init mac_early_cons_write(struct console *con,
+                                 const char *s, unsigned n)
+{
+	mac_early_print(s, n);
+}
+
+static struct console __initdata mac_early_cons = {
+	.name  = "early",
+	.write = mac_early_cons_write,
+	.flags = CON_PRINTBUFFER | CON_BOOT,
+	.index = -1
+};
+
+int __init mac_unregister_early_cons(void)
+{
+	/* mac_early_print can't be used after init sections are discarded */
+	return unregister_console(&mac_early_cons);
+}
+
+late_initcall(mac_unregister_early_cons);
+#endif
+
 static void __init mac_sched_init(irq_handler_t vector)
 {
 	via_init_clock(vector);
@@ -164,6 +189,10 @@ void __init config_mac(void)
 	mach_beep = mac_mksound;
 #endif
 
+#ifdef CONFIG_EARLY_PRINTK
+	register_console(&mac_early_cons);
+#endif
+
 	/*
 	 * Determine hardware present
 	 */