m68k: mac: Add and use "mac.h"

When building with W=1:

    arch/m68k/mac/iop.c:235:13: warning: no previous prototype for ‘iop_init’ [-Wmissing-prototypes]
      235 | void __init iop_init(void)
	  |             ^~~~~~~~
    arch/m68k/mac/via.c:112:13: warning: no previous prototype for ‘via_init’ [-Wmissing-prototypes]
      111 | void __init via_init(void)
	  |             ^~~~~~~~
    arch/m68k/mac/via.c:623:13: warning: no previous prototype for ‘via_init_clock’ [-Wmissing-prototypes]
      593 | void __init via_init_clock(void)
	  |             ^~~~~~~~~~~~~~
    arch/m68k/mac/oss.c:37:13: warning: no previous prototype for ‘oss_init’ [-Wmissing-prototypes]
       37 | void __init oss_init(void)
	  |             ^~~~~~~~
    arch/m68k/mac/psc.c:76:13: warning: no previous prototype for ‘psc_init’ [-Wmissing-prototypes]
       76 | void __init psc_init(void)
	  |             ^~~~~~~~
    arch/m68k/mac/baboon.c:25:13: warning: no previous prototype for ‘baboon_init’ [-Wmissing-prototypes]
       25 | void __init baboon_init(void)
	  |             ^~~~~~~~~~~
    arch/m68k/mac/macboing.c:155:6: warning: no previous prototype for ‘mac_mksound’ [-Wmissing-prototypes]
      155 | void mac_mksound( unsigned int freq, unsigned int length )
	  |      ^~~~~~~~~~~
    arch/m68k/mac/misc.c:608:5: warning: no previous prototype for ‘mac_hwclk’ [-Wmissing-prototypes]
      608 | int mac_hwclk(int op, struct rtc_time *t)
	  |     ^~~~~~~~~

Fix this by introducing a new header file "mac.h" for holding the
prototypes of functions implemented in arch/m68k/mac/.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/d1fe0014a9e472a305333de4fa17f335c93d73af.1694613528.git.geert@linux-m68k.org

arch/m68k/mac/baboon.c

@@ -15,6 +15,8 @@
 #include <asm/macints.h>
 #include <asm/mac_baboon.h>
 
+#include "mac.h"
+
 int baboon_present;
 static volatile struct baboon *baboon;
 

arch/m68k/mac/config.c

@@ -50,22 +50,14 @@
 #include <asm/mac_psc.h>
 #include <asm/config.h>
 
+#include "mac.h"
+
 /* Mac bootinfo struct */
 struct mac_booter_data mac_bi_data;
 
 /* The phys. video addr. - might be bogus on some machines */
 static unsigned long mac_orig_videoaddr;
 
-extern int mac_hwclk(int, struct rtc_time *);
-extern void iop_init(void);
-extern void via_init(void);
-extern void via_init_clock(void);
-extern void oss_init(void);
-extern void psc_init(void);
-extern void baboon_init(void);
-
-extern void mac_mksound(unsigned int, unsigned int);
-
 static void mac_get_model(char *str);
 static void mac_identify(void);
 static void mac_report_hardware(void);

arch/m68k/mac/iop.c

@@ -119,6 +119,8 @@
 #include <asm/macints.h>
 #include <asm/mac_iop.h>
 
+#include "mac.h"
+
 #ifdef DEBUG
 #define iop_pr_debug(fmt, ...) \
 	printk(KERN_DEBUG "%s: " fmt, __func__, ##__VA_ARGS__)

arch/m68k/mac/mac.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+struct rtc_time;
+
+/* baboon.c */
+void baboon_init(void);
+
+/* iop.c */
+void iop_init(void);
+
+/* misc.c */
+int mac_hwclk(int op, struct rtc_time *t);
+
+/* macboing.c */
+void mac_mksound(unsigned int freq, unsigned int length);
+
+/* oss.c */
+void oss_init(void);
+
+/* psc.c */
+void psc_init(void);
+
+/* via.c */
+void via_init(void);
+void via_init_clock(void);

arch/m68k/mac/macboing.c

@@ -16,6 +16,8 @@
 #include <asm/macintosh.h>
 #include <asm/mac_asc.h>
 
+#include "mac.h"
+
 static int mac_asc_inited;
 /*
  * dumb triangular wave table

arch/m68k/mac/misc.c

@@ -25,6 +25,8 @@
 
 #include <asm/machdep.h>
 
+#include "mac.h"
+
 /*
  * Offset between Unix time (1970-based) and Mac time (1904-based). Cuda and PMU
  * times wrap in 2040. If we need to handle later times, the read_time functions

arch/m68k/mac/oss.c

@@ -27,6 +27,8 @@
 #include <asm/mac_via.h>
 #include <asm/mac_oss.h>
 
+#include "mac.h"
+
 int oss_present;
 volatile struct mac_oss *oss;
 

arch/m68k/mac/psc.c

@@ -26,6 +26,8 @@
 #include <asm/macints.h>
 #include <asm/mac_psc.h>
 
+#include "mac.h"
+
 #define DEBUG_PSC
 
 volatile __u8 *psc;

arch/m68k/mac/via.c

@@ -38,6 +38,8 @@
 #include <asm/mac_psc.h>
 #include <asm/mac_oss.h>
 
+#include "mac.h"
+
 volatile __u8 *via1, *via2;
 int rbv_present;
 int via_alt_mapping;