1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Copyright (c) 2010-2011, The Linux Foundati !! 2 * This file is subject to the terms and conditions of the GNU General Public
>> 3 * License. See the file "COPYING" in the main directory of this archive
>> 4 * for more details.
>> 5 *
>> 6 * Copyright (C) 2001, 06 by Ralf Baechle (ralf@linux-mips.org)
>> 7 * Copyright (C) 2001 MIPS Technologies, Inc.
4 */ 8 */
5 !! 9 #include <linux/kernel.h>
>> 10 #include <linux/export.h>
>> 11 #include <linux/pm.h>
>> 12 #include <linux/types.h>
6 #include <linux/reboot.h> 13 #include <linux/reboot.h>
7 #include <linux/smp.h> !! 14 #include <linux/delay.h>
8 #include <asm/hexagon_vm.h> <<
9 15
10 void machine_power_off(void) !! 16 #include <asm/compiler.h>
>> 17 #include <asm/idle.h>
>> 18 #include <asm/mipsregs.h>
>> 19 #include <asm/reboot.h>
>> 20
>> 21 /*
>> 22 * Urgs ... Too many MIPS machines to handle this in a generic way.
>> 23 * So handle all using function pointers to machine specific
>> 24 * functions.
>> 25 */
>> 26 void (*_machine_restart)(char *command);
>> 27 void (*_machine_halt)(void);
>> 28 void (*pm_power_off)(void);
>> 29
>> 30 EXPORT_SYMBOL(pm_power_off);
>> 31
>> 32 static void machine_hang(void)
>> 33 {
>> 34 /*
>> 35 * We're hanging the system so we don't want to be interrupted anymore.
>> 36 * Any interrupt handlers that ran would at best be useless & at worst
>> 37 * go awry because the system isn't in a functional state.
>> 38 */
>> 39 local_irq_disable();
>> 40
>> 41 /*
>> 42 * Mask all interrupts, giving us a better chance of remaining in the
>> 43 * low power wait state.
>> 44 */
>> 45 clear_c0_status(ST0_IM);
>> 46
>> 47 while (true) {
>> 48 if (cpu_has_mips_r) {
>> 49 /*
>> 50 * We know that the wait instruction is supported so
>> 51 * make use of it directly, leaving interrupts
>> 52 * disabled.
>> 53 */
>> 54 asm volatile(
>> 55 ".set push\n\t"
>> 56 ".set " MIPS_ISA_ARCH_LEVEL "\n\t"
>> 57 "wait\n\t"
>> 58 ".set pop");
>> 59 } else if (cpu_wait) {
>> 60 /*
>> 61 * Try the cpu_wait() callback. This isn't ideal since
>> 62 * it'll re-enable interrupts, but that ought to be
>> 63 * harmless given that they're all masked.
>> 64 */
>> 65 cpu_wait();
>> 66 local_irq_disable();
>> 67 } else {
>> 68 /*
>> 69 * We're going to burn some power running round the
>> 70 * loop, but we don't really have a choice. This isn't
>> 71 * a path we should expect to run for long during
>> 72 * typical use anyway.
>> 73 */
>> 74 }
>> 75
>> 76 /*
>> 77 * In most modern MIPS CPUs interrupts will cause the wait
>> 78 * instruction to graduate even when disabled, and in some
>> 79 * cases even when masked. In order to prevent a timer
>> 80 * interrupt from continuously taking us out of the low power
>> 81 * wait state, we clear any pending timer interrupt here.
>> 82 */
>> 83 if (cpu_has_counter)
>> 84 write_c0_compare(0);
>> 85 }
>> 86 }
>> 87
>> 88 void machine_restart(char *command)
11 { 89 {
>> 90 if (_machine_restart)
>> 91 _machine_restart(command);
>> 92
>> 93 #ifdef CONFIG_SMP
>> 94 preempt_disable();
12 smp_send_stop(); 95 smp_send_stop();
13 __vmstop(); !! 96 #endif
>> 97 do_kernel_restart(command);
>> 98 mdelay(1000);
>> 99 pr_emerg("Reboot failed -- System halted\n");
>> 100 machine_hang();
14 } 101 }
15 102
16 void machine_halt(void) 103 void machine_halt(void)
17 { 104 {
>> 105 if (_machine_halt)
>> 106 _machine_halt();
>> 107
>> 108 #ifdef CONFIG_SMP
>> 109 preempt_disable();
>> 110 smp_send_stop();
>> 111 #endif
>> 112 machine_hang();
18 } 113 }
19 114
20 void machine_restart(char *cmd) !! 115 void machine_power_off(void)
21 { 116 {
22 } !! 117 do_kernel_power_off();
23 118
24 void (*pm_power_off)(void) = NULL; !! 119 #ifdef CONFIG_SMP
25 EXPORT_SYMBOL(pm_power_off); !! 120 preempt_disable();
>> 121 smp_send_stop();
>> 122 #endif
>> 123 machine_hang();
>> 124 }
26 125
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