1/*
 2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 3 * Copyright (C) 2007-2009 PetaLogix
 4 * Copyright (C) 2006 Atmark Techno, Inc.
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License. See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 */
10
11#include <linux/sched.h>
12#include <linux/sched/loadavg.h>
13#include <linux/io.h>
14
15#include <asm/setup.h>
16#include <asm/page.h>
17#include <asm/prom.h>
18
19static unsigned int base_addr;
20
21void microblaze_heartbeat(void)
22{
23	static unsigned int cnt, period, dist;
24
25	if (base_addr) {
26		if (cnt == 0 || cnt == dist)
27			out_be32(base_addr, 1);
28		else if (cnt == 7 || cnt == dist + 7)
29			out_be32(base_addr, 0);
30
31		if (++cnt > period) {
32			cnt = 0;
33			/*
34			 * The hyperbolic function below modifies the heartbeat
35			 * period length in dependency of the current (5min)
36			 * load. It goes through the points f(0)=126, f(1)=86,
37			 * f(5)=51, f(inf)->30.
38			 */
39			period = ((672 << FSHIFT) / (5 * avenrun[0] +
40						(7 << FSHIFT))) + 30;
41			dist = period / 4;
42		}
43	}
44}
45
46void microblaze_setup_heartbeat(void)
47{
48	struct device_node *gpio = NULL;
49	int *prop;
50	int j;
51	const char * const gpio_list[] = {
52		"xlnx,xps-gpio-1.00.a",
53		NULL
54	};
55
56	for (j = 0; gpio_list[j] != NULL; j++) {
57		gpio = of_find_compatible_node(NULL, NULL, gpio_list[j]);
58		if (gpio)
59			break;
60	}
61
62	if (gpio) {
63		base_addr = be32_to_cpup(of_get_property(gpio, "reg", NULL));
64		base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
65		pr_notice("Heartbeat GPIO at 0x%x\n", base_addr);
66
67		/* GPIO is configured as output */
68		prop = (int *) of_get_property(gpio, "xlnx,is-bidir", NULL);
69		if (prop)
70			out_be32(base_addr + 4, 0);
71	}
72}

 1/*
 2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 3 * Copyright (C) 2007-2009 PetaLogix
 4 * Copyright (C) 2006 Atmark Techno, Inc.
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License. See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 */
10
11#include <linux/sched.h>
 
12#include <linux/io.h>
13
14#include <asm/setup.h>
15#include <asm/page.h>
16#include <asm/prom.h>
17
18static unsigned int base_addr;
19
20void microblaze_heartbeat(void)
21{
22	static unsigned int cnt, period, dist;
23
24	if (base_addr) {
25		if (cnt == 0 || cnt == dist)
26			out_be32(base_addr, 1);
27		else if (cnt == 7 || cnt == dist + 7)
28			out_be32(base_addr, 0);
29
30		if (++cnt > period) {
31			cnt = 0;
32			/*
33			 * The hyperbolic function below modifies the heartbeat
34			 * period length in dependency of the current (5min)
35			 * load. It goes through the points f(0)=126, f(1)=86,
36			 * f(5)=51, f(inf)->30.
37			 */
38			period = ((672 << FSHIFT) / (5 * avenrun[0] +
39						(7 << FSHIFT))) + 30;
40			dist = period / 4;
41		}
42	}
43}
44
45void microblaze_setup_heartbeat(void)
46{
47	struct device_node *gpio = NULL;
48	int *prop;
49	int j;
50	const char * const gpio_list[] = {
51		"xlnx,xps-gpio-1.00.a",
52		NULL
53	};
54
55	for (j = 0; gpio_list[j] != NULL; j++) {
56		gpio = of_find_compatible_node(NULL, NULL, gpio_list[j]);
57		if (gpio)
58			break;
59	}
60
61	if (gpio) {
62		base_addr = be32_to_cpup(of_get_property(gpio, "reg", NULL));
63		base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
64		pr_notice("Heartbeat GPIO at 0x%x\n", base_addr);
65
66		/* GPIO is configured as output */
67		prop = (int *) of_get_property(gpio, "xlnx,is-bidir", NULL);
68		if (prop)
69			out_be32(base_addr + 4, 0);
70	}
71}