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/*
 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#include <linux/platform_device.h>
17#include <linux/clocksource.h>
18#include <linux/delay.h>
19#include <linux/of_address.h>
 
20
21#include "common.h"
22
23void __init shmobile_init_delay(void)
24{
25	struct device_node *np, *cpus;
26	u32 max_freq = 0;
 
 
 
 
 
27
28	cpus = of_find_node_by_path("/cpus");
29	if (!cpus)
30		return;
31
32	for_each_child_of_node(cpus, np) {
33		u32 freq;
34
35		if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER) &&
36		    (of_device_is_compatible(np, "arm,cortex-a7") ||
37		     of_device_is_compatible(np, "arm,cortex-a15"))) {
38			of_node_put(np);
39			of_node_put(cpus);
40			return;
41		}
42
43		if (!of_property_read_u32(np, "clock-frequency", &freq))
44			max_freq = max(max_freq, freq);
45	}
46
47	of_node_put(cpus);
48
49	if (!max_freq)
50		return;
51
 
 
52	/*
53	 * Calculate a worst-case loops-per-jiffy value
54	 * based on maximum cpu core hz setting and the
55	 * __delay() implementation in arch/arm/lib/delay.S.
56	 *
57	 * This will result in a longer delay than expected
58	 * when the cpu core runs on lower frequencies.
 
 
 
59	 */
 
 
 
 
 
 
 
 
60
61	if (!preset_lpj)
62		preset_lpj = max_freq / HZ;
63}