Release 4.10 arch/arm/mach-ep93xx/crunch.c

/*
 * arch/arm/kernel/crunch.c
 * Cirrus MaverickCrunch context switching and handling
 *
 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/io.h>

#include <asm/thread_notify.h>

#include "soc.h"


struct crunch_state *crunch_owner;



void crunch_task_release(struct thread_info *thread)
{
	local_irq_disable();
	if (crunch_owner == &thread->crunchstate)
		crunch_owner = NULL;
	local_irq_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
lennert buytenhek
lennert buytenhek
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



static int crunch_enabled(u32 devcfg)
{
	return !!(devcfg & EP93XX_SYSCON_DEVCFG_CPENA);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
lennert buytenhek
lennert buytenhek
17
94.44%
1
50.00%
h hartley sweeten
h hartley sweeten
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%



static int crunch_do(struct notifier_block *self, unsigned long cmd, void *t)
{
	struct thread_info *thread = (struct thread_info *)t;
	struct crunch_state *crunch_state;
	u32 devcfg;

	crunch_state = &thread->crunchstate;

	switch (cmd) {
	case THREAD_NOTIFY_FLUSH:
		memset(crunch_state, 0, sizeof(*crunch_state));

		/*
                 * FALLTHROUGH: Ensure we don't try to overwrite our newly
                 * initialised state information on the first fault.
                 */

	case THREAD_NOTIFY_EXIT:
		crunch_task_release(thread);
		break;

	case THREAD_NOTIFY_SWITCH:
		devcfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
		if (crunch_enabled(devcfg) || crunch_owner == crunch_state) {
			/*
                         * We don't use ep93xx_syscon_swlocked_write() here
                         * because we are on the context switch path and
                         * preemption is already disabled.
                         */
			devcfg ^= EP93XX_SYSCON_DEVCFG_CPENA;
			__raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
			__raw_writel(devcfg, EP93XX_SYSCON_DEVCFG);
		}
		break;
	}

	return NOTIFY_DONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
lennert buytenhek
lennert buytenhek
119
95.97%
1
33.33%
h hartley sweeten
h hartley sweeten
4
3.23%
1
33.33%
russell king
russell king
1
0.81%
1
33.33%
Total
124
100.00%
3
100.00%


static struct notifier_block crunch_notifier_block = {
	.notifier_call	= crunch_do,
};



int __init crunch_init(void)
{
	thread_register_notifier(&crunch_notifier_block);
	elf_hwcap |= HWCAP_CRUNCH;

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
lennert buytenhek
lennert buytenhek
21
100.00%
2
100.00%
Total
21
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
lennert buytenhek
lennert buytenhek
226
95.36%
2
33.33%
h hartley sweeten
h hartley sweeten
5
2.11%
1
16.67%
russell king
russell king
3
1.27%
2
33.33%
ryan mallon
ryan mallon
3
1.27%
1
16.67%
Total
237
100.00%
6
100.00%
Directory: arch/arm/mach-ep93xx

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.