m68k: split heartbeat out of timer function

The heartbeat functionality is mostly separate from the
actual timer interrupt handling, and it is only used on
five platforms.

Split it out into a separate function and call that directly
from the timer irq on those platforms.

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/m68k/amiga/config.c

@@ -480,6 +480,7 @@ static irqreturn_t ciab_timer_handler(int irq, void *dev_id)
 	clk_total += jiffy_ticks;
 	clk_offset = 0;
 	timer_routine(0, NULL);
+	timer_heartbeat();
 
 	return IRQ_HANDLED;
 }

arch/m68k/apollo/config.c

@@ -173,6 +173,7 @@ irqreturn_t dn_timer_int(int irq, void *dev_id)
 	volatile unsigned char x;
 
 	timer_handler(irq, dev_id);
+	timer_heartbeat();
 
 	x = *(volatile unsigned char *)(apollo_timer + 3);
 	x = *(volatile unsigned char *)(apollo_timer + 5);

arch/m68k/atari/time.c

@@ -21,6 +21,7 @@
 #include <linux/export.h>
 
 #include <asm/atariints.h>
+#include <asm/machdep.h>
 
 DEFINE_SPINLOCK(rtc_lock);
 EXPORT_SYMBOL_GPL(rtc_lock);
@@ -49,6 +50,7 @@ static irqreturn_t mfp_timer_c_handler(int irq, void *dev_id)
 	} while (last_timer_count == 1);
 	clk_total += INT_TICKS;
 	timer_routine(0, NULL);
+	timer_heartbeat();
 	local_irq_restore(flags);
 
 	return IRQ_HANDLED;

arch/m68k/hp300/time.c

@@ -65,6 +65,7 @@ static irqreturn_t hp300_tick(int irq, void *dev_id)
 	clk_total += INTVAL;
 	clk_offset = 0;
 	timer_routine(0, NULL);
+	timer_heartbeat();
 	local_irq_restore(flags);
 
 	/* Turn off the network and SCSI leds */

arch/m68k/include/asm/machdep.h

@@ -35,6 +35,13 @@ extern void (*mach_beep) (unsigned int, unsigned int);
 /* Hardware clock functions */
 extern void hw_timer_init(irq_handler_t handler);
 extern unsigned long hw_timer_offset(void);
+#ifdef CONFIG_HEARTBEAT
+extern void timer_heartbeat(void);
+#else
+static inline void timer_heartbeat(void)
+{
+}
+#endif
 
 extern void config_BSP(char *command, int len);
 

arch/m68k/kernel/time.c

@@ -45,8 +45,12 @@ static irqreturn_t timer_interrupt(int irq, void *dummy)
 	xtime_update(1);
 	update_process_times(user_mode(get_irq_regs()));
 	profile_tick(CPU_PROFILING);
+	return IRQ_HANDLED;
+}
 
 #ifdef CONFIG_HEARTBEAT
+void timer_heartbeat(void)
+{
 	/* use power LED as a heartbeat instead -- much more useful
 	   for debugging -- based on the version for PReP by Cort */
 	/* acts like an actual heart beat -- ie thump-thump-pause... */
@@ -68,9 +72,8 @@ static irqreturn_t timer_interrupt(int irq, void *dummy)
 		dist = period / 4;
 	    }
 	}
-#endif /* CONFIG_HEARTBEAT */
-	return IRQ_HANDLED;
 }
+#endif /* CONFIG_HEARTBEAT */
 
 #ifdef CONFIG_M68KCLASSIC
 #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)

arch/m68k/q40/q40ints.c

@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 
+#include <asm/machdep.h>
 #include <asm/ptrace.h>
 #include <asm/traps.h>
 
@@ -144,6 +145,7 @@ static irqreturn_t q40_timer_int(int irq, void *dev_id)
 
 		local_irq_save(flags);
 		timer_routine(0, NULL);
+		timer_heartbeat();
 		local_irq_restore(flags);
 	}
 	return IRQ_HANDLED;