1/*
 2 * SH-Mobile Timer
 3 *
 4 * Copyright (C) 2010  Magnus Damm
 5 * Copyright (C) 2002 - 2009  Paul Mundt
 6 *
 7 * This program is free software; you can redistribute it and/or modify
 8 * it under the terms of the GNU General Public License as published by
 9 * the Free Software Foundation; version 2 of the License.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
19 *
20 */
21#include <linux/platform_device.h>
 
22#include <linux/delay.h>
23#include <asm/mach/time.h>
24#include <asm/smp_twd.h>
 
25
26void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz,
27				 unsigned int mult, unsigned int div)
28{
29	/* calculate a worst-case loops-per-jiffy value
30	 * based on maximum cpu core mhz setting and the
31	 * __delay() implementation in arch/arm/lib/delay.S
32	 *
33	 * this will result in a longer delay than expected
34	 * when the cpu core runs on lower frequencies.
35	 */
36
37	unsigned int value = (1000000 * mult) / (HZ * div);
 
38
39	if (!preset_lpj)
40		preset_lpj = max_cpu_core_mhz * value;
41}
 
 
 
42
43static void __init shmobile_late_time_init(void)
44{
45	/*
46	 * Make sure all compiled-in early timers register themselves.
 
 
47	 *
48	 * Run probe() for two "earlytimer" devices, these will be the
49	 * clockevents and clocksource devices respectively. In the event
50	 * that only a clockevents device is available, we -ENODEV on the
51	 * clocksource and the jiffies clocksource is used transparently
52	 * instead. No error handling is necessary here.
53	 */
54	early_platform_driver_register_all("earlytimer");
55	early_platform_driver_probe("earlytimer", 2, 0);
56}
57
58void __init shmobile_earlytimer_init(void)
59{
60	late_time_init = shmobile_late_time_init;
61}
62
63static void __init shmobile_timer_init(void)
64{
65}
66
67struct sys_timer shmobile_timer = {
68	.init		= shmobile_timer_init,
69};

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * SH-Mobile Timer
 4 *
 5 * Copyright (C) 2010  Magnus Damm
 6 * Copyright (C) 2002 - 2009  Paul Mundt
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 7 */
 8#include <linux/platform_device.h>
 9#include <linux/clocksource.h>
10#include <linux/delay.h>
11#include <linux/of_address.h>
12
13#include "common.h"
14
15void __init shmobile_init_delay(void)
 
16{
17	struct device_node *np;
18	u32 max_freq = 0;
 
 
 
 
 
19
20	for_each_of_cpu_node(np) {
21		u32 freq;
22
23		if (!of_property_read_u32(np, "clock-frequency", &freq))
24			max_freq = max(max_freq, freq);
25	}
26
27	if (!max_freq)
28		return;
29
 
 
30	/*
31	 * Calculate a worst-case loops-per-jiffy value
32	 * based on maximum cpu core hz setting and the
33	 * __delay() implementation in arch/arm/lib/delay.S.
34	 *
35	 * This will result in a longer delay than expected
36	 * when the cpu core runs on lower frequencies.
 
 
 
37	 */
 
 
 
 
 
 
 
 
38
39	if (!preset_lpj)
40		preset_lpj = max_freq / HZ;
41}