Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
MIPS: Loongson64: Implement PM suspend for LEFI firmware
Implement PM suspend for LEFI firmware.
Entering STR (Suspend to RAM) is as simple as save our context
then go to a firmware vector.
Wake is a little bit treaky as we need to setup some CP0 status
first, which can be done with smp_slave_setup.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
authored by
Jiaxun Yang
and committed by
Thomas Bogendoerfer
68557c59
2226d454
+38
-73
+1
-1
arch/mips/loongson64/Makefile
+1
-1
arch/mips/loongson64/Makefile
···
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_NUMA) += numa.o
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obj-$(CONFIG_RS780_HPET) += hpet.o
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-
obj-$(CONFIG_SUSPEND) += pm.o
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obj-$(CONFIG_SUSPEND) += pm.o sleeper.o
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obj-$(CONFIG_PCI_QUIRKS) += vbios_quirk.o
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obj-$(CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION) += cpucfg-emul.o
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obj-$(CONFIG_SYSFS) += boardinfo.o
+20
-72
arch/mips/loongson64/pm.c
+20
-72
arch/mips/loongson64/pm.c
···
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* Author: Wu Zhangjin <wuzhangjin@gmail.com>
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*/
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#include <linux/suspend.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <asm/i8259.h>
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#include <asm/mipsregs.h>
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#include <loongson.h>
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static unsigned int __maybe_unused cached_master_mask; /* i8259A */
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static unsigned int __maybe_unused cached_slave_mask;
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static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
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asmlinkage void loongson_lefi_sleep(unsigned long sleep_addr);
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void arch_suspend_disable_irqs(void)
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{
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/* disable all mips events */
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local_irq_disable();
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-
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#ifdef CONFIG_I8259
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/* disable all events of i8259A */
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cached_slave_mask = inb(PIC_SLAVE_IMR);
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cached_master_mask = inb(PIC_MASTER_IMR);
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outb(0xff, PIC_SLAVE_IMR);
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inb(PIC_SLAVE_IMR);
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outb(0xff, PIC_MASTER_IMR);
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inb(PIC_MASTER_IMR);
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#endif
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/* disable all events of bonito */
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cached_bonito_irq_mask = LOONGSON_INTEN;
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LOONGSON_INTENCLR = 0xffff;
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(void)LOONGSON_INTENCLR;
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}
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void arch_suspend_enable_irqs(void)
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{
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/* enable all mips events */
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local_irq_enable();
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#ifdef CONFIG_I8259
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/* only enable the cached events of i8259A */
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outb(cached_slave_mask, PIC_SLAVE_IMR);
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outb(cached_master_mask, PIC_MASTER_IMR);
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#endif
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/* enable all cached events of bonito */
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LOONGSON_INTENSET = cached_bonito_irq_mask;
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(void)LOONGSON_INTENSET;
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}
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/*
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* Setup the board-specific events for waking up loongson from wait mode
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*/
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void __weak setup_wakeup_events(void)
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{
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}
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void __weak mach_suspend(void)
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{
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}
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void __weak mach_resume(void)
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{
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}
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static int loongson_pm_enter(suspend_state_t state)
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{
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mach_suspend();
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mach_resume();
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return 0;
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}
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static int loongson_pm_valid_state(suspend_state_t state)
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static int lefi_pm_enter(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_ON:
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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return 1;
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pm_set_suspend_via_firmware();
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loongson_lefi_sleep(loongson_sysconf.suspend_addr);
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pm_set_resume_via_firmware();
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int lefi_pm_valid_state(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_MEM:
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return !!loongson_sysconf.suspend_addr;
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default:
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return 0;
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}
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}
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static const struct platform_suspend_ops loongson_pm_ops = {
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.valid = loongson_pm_valid_state,
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.enter = loongson_pm_enter,
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static const struct platform_suspend_ops lefi_pm_ops = {
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.valid = lefi_pm_valid_state,
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.enter = lefi_pm_enter,
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};
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static int __init loongson_pm_init(void)
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{
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suspend_set_ops(&loongson_pm_ops);
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if (loongson_sysconf.fw_interface == LOONGSON_LEFI)
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suspend_set_ops(&lefi_pm_ops);
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return 0;
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}
+17
arch/mips/loongson64/sleeper.S
+17
arch/mips/loongson64/sleeper.S
···
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2024, Jiaxun Yang <jiaxun.yang@flygoat.com>
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* Loongson EFI firmware sleeper routine
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*/
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#include <asm/asm.h>
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#include <asm/pm.h>
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#include <kernel-entry-init.h>
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LEAF(loongson_lefi_sleep)
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SUSPEND_SAVE
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jalr a0
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smp_slave_setup
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RESUME_RESTORE_REGS_RETURN
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END(loongson_lefi_sleep)