microblaze: Remove architecture heart beat code

There is no reason to keep this gpio based code in architecture. Use
ledtrig-heartbeat.c instead which is much more flexible then this
ancient code.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

arch/microblaze/Kconfig.debug

@@ -8,11 +8,4 @@ config TRACE_IRQFLAGS_SUPPORT
 
 source "lib/Kconfig.debug"
 
-config HEART_BEAT
-	bool "Heart beat function for kernel"
-	default n
-	help
-	  This option turns on/off heart beat kernel functionality.
-	  First GPIO node is taken.
-
 endmenu

arch/microblaze/include/asm/setup.h

@@ -19,9 +19,6 @@ extern char cmd_line[COMMAND_LINE_SIZE];
 
 extern char *klimit;
 
-void microblaze_heartbeat(void);
-void microblaze_setup_heartbeat(void);
-
 #   ifdef CONFIG_MMU
 extern void mmu_reset(void);
 #   endif /* CONFIG_MMU */

arch/microblaze/kernel/Makefile

@@ -8,7 +8,6 @@ ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_timer.o = -pg
 CFLAGS_REMOVE_intc.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
-CFLAGS_REMOVE_heartbeat.o = -pg
 CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_process.o = -pg
 endif
@@ -22,7 +21,6 @@ obj-y += dma.o exceptions.o \
 
 obj-y += cpu/
 
-obj-$(CONFIG_HEART_BEAT)	+= heartbeat.o
 obj-$(CONFIG_MODULES)		+= microblaze_ksyms.o module.o
 obj-$(CONFIG_MMU)		+= misc.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o

arch/microblaze/kernel/heartbeat.c

@@ -1,72 +0,0 @@
-/*
- * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
- * Copyright (C) 2007-2009 PetaLogix
- * Copyright (C) 2006 Atmark Techno, Inc.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-#include <linux/sched.h>
-#include <linux/sched/loadavg.h>
-#include <linux/io.h>
-#include <linux/of.h>
-
-#include <asm/setup.h>
-#include <asm/page.h>
-
-static unsigned int base_addr;
-
-void microblaze_heartbeat(void)
-{
-	static unsigned int cnt, period, dist;
-
-	if (base_addr) {
-		if (cnt == 0 || cnt == dist)
-			out_be32(base_addr, 1);
-		else if (cnt == 7 || cnt == dist + 7)
-			out_be32(base_addr, 0);
-
-		if (++cnt > period) {
-			cnt = 0;
-			/*
-			 * The hyperbolic function below modifies the heartbeat
-			 * period length in dependency of the current (5min)
-			 * load. It goes through the points f(0)=126, f(1)=86,
-			 * f(5)=51, f(inf)->30.
-			 */
-			period = ((672 << FSHIFT) / (5 * avenrun[0] +
-						(7 << FSHIFT))) + 30;
-			dist = period / 4;
-		}
-	}
-}
-
-void microblaze_setup_heartbeat(void)
-{
-	struct device_node *gpio = NULL;
-	int *prop;
-	int j;
-	const char * const gpio_list[] = {
-		"xlnx,xps-gpio-1.00.a",
-		NULL
-	};
-
-	for (j = 0; gpio_list[j] != NULL; j++) {
-		gpio = of_find_compatible_node(NULL, NULL, gpio_list[j]);
-		if (gpio)
-			break;
-	}
-
-	if (gpio) {
-		base_addr = be32_to_cpup(of_get_property(gpio, "reg", NULL));
-		base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
-		pr_notice("Heartbeat GPIO at 0x%x\n", base_addr);
-
-		/* GPIO is configured as output */
-		prop = (int *) of_get_property(gpio, "xlnx,is-bidir", NULL);
-		if (prop)
-			out_be32(base_addr + 4, 0);
-	}
-}

arch/microblaze/kernel/timer.c

@@ -156,9 +156,6 @@ static inline void timer_ack(void)
 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
 	struct clock_event_device *evt = &clockevent_xilinx_timer;
-#ifdef CONFIG_HEART_BEAT
-	microblaze_heartbeat();
-#endif
 	timer_ack();
 	evt->event_handler(evt);
 	return IRQ_HANDLED;
@@ -318,10 +315,6 @@ static int __init xilinx_timer_init(struct device_node *timer)
 		return ret;
 	}
 
-#ifdef CONFIG_HEART_BEAT
-	microblaze_setup_heartbeat();
-#endif
-
 	ret = xilinx_clocksource_init();
 	if (ret)
 		return ret;