Release 4.18 arch/mips/kernel/reset.c

/*
 * 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.
 *
 * Copyright (C) 2001, 06 by Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/pm.h>
#include <linux/types.h>
#include <linux/reboot.h>
#include <linux/delay.h>

#include <asm/compiler.h>
#include <asm/idle.h>
#include <asm/mipsregs.h>
#include <asm/reboot.h>

/*
 * Urgs ...  Too many MIPS machines to handle this in a generic way.
 * So handle all using function pointers to machine specific
 * functions.
 */

void (*_machine_restart)(char *command);

void (*_machine_halt)(void);

void (*pm_power_off)(void);

EXPORT_SYMBOL(pm_power_off);



static void machine_hang(void)
{
	/*
         * We're hanging the system so we don't want to be interrupted anymore.
         * Any interrupt handlers that ran would at best be useless & at worst
         * go awry because the system isn't in a functional state.
         */
	local_irq_disable();

	/*
         * Mask all interrupts, giving us a better chance of remaining in the
         * low power wait state.
         */
	clear_c0_status(ST0_IM);

	while (true) {
		if (cpu_has_mips_r) {
			/*
                         * We know that the wait instruction is supported so
                         * make use of it directly, leaving interrupts
                         * disabled.
                         */
			asm volatile(
                                ".set   push\n\t"
                                ".set   " MIPS_ISA_ARCH_LEVEL "\n\t"
                                "wait\n\t"
                                ".set   pop");
		} else if (cpu_wait) {
			/*
                         * Try the cpu_wait() callback. This isn't ideal since
                         * it'll re-enable interrupts, but that ought to be
                         * harmless given that they're all masked.
                         */
			cpu_wait();
			local_irq_disable();
		} else {
			/*
                         * We're going to burn some power running round the
                         * loop, but we don't really have a choice. This isn't
                         * a path we should expect to run for long during
                         * typical use anyway.
                         */
		}

		/*
                 * In most modern MIPS CPUs interrupts will cause the wait
                 * instruction to graduate even when disabled, and in some
                 * cases even when masked. In order to prevent a timer
                 * interrupt from continuously taking us out of the low power
                 * wait state, we clear any pending timer interrupt here.
                 */
		if (cpu_has_counter)
			write_c0_compare(0);
	}
}

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void machine_restart(char *command)
{
	if (_machine_restart)
		_machine_restart(command);

#ifdef CONFIG_SMP
	preempt_disable();
	smp_send_stop();
#endif
	do_kernel_restart(command);
	mdelay(1000);
	pr_emerg("Reboot failed -- System halted\n");
	machine_hang();
}

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Andrew Bresticker
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1
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Linus Torvalds (pre-git)
14
29.79%
1
25.00%
Ralf Bächle
4
8.51%
1
25.00%
Paul Burton
1
2.13%
1
25.00%
Total
47
100.00%
4
100.00%



void machine_halt(void)
{
	if (_machine_halt)
		_machine_halt();

#ifdef CONFIG_SMP
	preempt_disable();
	smp_send_stop();
#endif
	machine_hang();
}

Contributors
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CommitProp
Andrew Bresticker
13
46.43%
1
25.00%
Linus Torvalds (pre-git)
10
35.71%
1
25.00%
Ralf Bächle
4
14.29%
1
25.00%
Paul Burton
1
3.57%
1
25.00%
Total
28
100.00%
4
100.00%



void machine_power_off(void)
{
	if (pm_power_off)
		pm_power_off();

#ifdef CONFIG_SMP
	preempt_disable();
	smp_send_stop();
#endif
	machine_hang();
}
Contributors
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CommitProp
Andrew Bresticker
13
46.43%
1
20.00%
Linus Torvalds (pre-git)
9
32.14%
1
20.00%
Ralf Bächle
5
17.86%
2
40.00%
Paul Burton
1
3.57%
1
20.00%
Total
28
100.00%
5
100.00%

Overall Contributors
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Commits
CommitProp
Paul Burton
74
32.03%
1
11.11%
Andrew Bresticker
57
24.68%
1
11.11%
Linus Torvalds (pre-git)
46
19.91%
1
11.11%
Linus Torvalds
28
12.12%
1
11.11%
Ralf Bächle
23
9.96%
3
33.33%
Arnaldo Carvalho de Melo
2
0.87%
1
11.11%
Paul Gortmaker
1
0.43%
1
11.11%
Total
231
100.00%
9
100.00%
Directory: arch/mips/kernel

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