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MIPS: Loongson64: Implement PM suspend for LEFI firmware

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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>
This commit is contained in:
Jiaxun Yang 2024-05-07 16:22:01 +01:00 committed by Thomas Bogendoerfer
parent 2226d454db
commit 68557c59a5
3 changed files with 38 additions and 73 deletions
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2
arch/mips/loongson64/Makefile
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@ -8,7 +8,7 @@ obj-$(CONFIG_MACH_LOONGSON64) += cop2-ex.o dma.o \
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_RS780_HPET) += hpet.o
obj-$(CONFIG_SUSPEND) += pm.o
obj-$(CONFIG_SUSPEND) += pm.o sleeper.o
obj-$(CONFIG_PCI_QUIRKS) += vbios_quirk.o
obj-$(CONFIG_CPU_LOONGSON3_CPUCFG_EMULATION) += cpucfg-emul.o
obj-$(CONFIG_SYSFS) += boardinfo.o

92
arch/mips/loongson64/pm.c
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@ -6,98 +6,46 @@
* Author: Wu Zhangjin <wuzhangjin@gmail.com>
*/
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <asm/i8259.h>
#include <asm/mipsregs.h>
#include <loongson.h>
static unsigned int __maybe_unused cached_master_mask; /* i8259A */
static unsigned int __maybe_unused cached_slave_mask;
static unsigned int __maybe_unused cached_bonito_irq_mask; /* bonito */
asmlinkage void loongson_lefi_sleep(unsigned long sleep_addr);
void arch_suspend_disable_irqs(void)
{
/* disable all mips events */
local_irq_disable();
#ifdef CONFIG_I8259
/* disable all events of i8259A */
cached_slave_mask = inb(PIC_SLAVE_IMR);
cached_master_mask = inb(PIC_MASTER_IMR);
outb(0xff, PIC_SLAVE_IMR);
inb(PIC_SLAVE_IMR);
outb(0xff, PIC_MASTER_IMR);
inb(PIC_MASTER_IMR);
#endif
/* disable all events of bonito */
cached_bonito_irq_mask = LOONGSON_INTEN;
LOONGSON_INTENCLR = 0xffff;
(void)LOONGSON_INTENCLR;
}
void arch_suspend_enable_irqs(void)
{
/* enable all mips events */
local_irq_enable();
#ifdef CONFIG_I8259
/* only enable the cached events of i8259A */
outb(cached_slave_mask, PIC_SLAVE_IMR);
outb(cached_master_mask, PIC_MASTER_IMR);
#endif
/* enable all cached events of bonito */
LOONGSON_INTENSET = cached_bonito_irq_mask;
(void)LOONGSON_INTENSET;
}
/*
* Setup the board-specific events for waking up loongson from wait mode
*/
void __weak setup_wakeup_events(void)
{
}
void __weak mach_suspend(void)
{
}
void __weak mach_resume(void)
{
}
static int loongson_pm_enter(suspend_state_t state)
{
mach_suspend();
mach_resume();
return 0;
}
static int loongson_pm_valid_state(suspend_state_t state)
static int lefi_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_ON:
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
return 1;
pm_set_suspend_via_firmware();
loongson_lefi_sleep(loongson_sysconf.suspend_addr);
pm_set_resume_via_firmware();
return 0;
default:
return -EINVAL;
}
}
static int lefi_pm_valid_state(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
return !!loongson_sysconf.suspend_addr;
default:
return 0;
}
}
static const struct platform_suspend_ops loongson_pm_ops = {
.valid = loongson_pm_valid_state,
.enter = loongson_pm_enter,
static const struct platform_suspend_ops lefi_pm_ops = {
.valid = lefi_pm_valid_state,
.enter = lefi_pm_enter,
};
static int __init loongson_pm_init(void)
{
suspend_set_ops(&loongson_pm_ops);
if (loongson_sysconf.fw_interface == LOONGSON_LEFI)
suspend_set_ops(&lefi_pm_ops);
return 0;
}

17
arch/mips/loongson64/sleeper.S Normal file
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@ -0,0 +1,17 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2024, Jiaxun Yang <jiaxun.yang@flygoat.com>
* Loongson EFI firmware sleeper routine
*/
#include <asm/asm.h>
#include <asm/pm.h>
#include <kernel-entry-init.h>
LEAF(loongson_lefi_sleep)
SUSPEND_SAVE
jalr a0
smp_slave_setup
RESUME_RESTORE_REGS_RETURN
END(loongson_lefi_sleep)