1 files changed, 104 insertions, 0 deletions

diff --git a/arch/mips/loongson64/pm.c b/arch/mips/loongson64/pm.c
new file mode 100644
index 000000000..7c8556f09
--- /dev/null
+++ b/arch/mips/loongson64/pm.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * loongson-specific suspend support
+ *
+ *  Copyright (C) 2009 Lemote Inc.
+ *  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 */
+
+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)
+{
+        switch (state) {
+        case PM_SUSPEND_ON:
+        case PM_SUSPEND_STANDBY:
+        case PM_SUSPEND_MEM:
+                return 1;
+
+        default:
+                return 0;
+        }
+}
+
+static const struct platform_suspend_ops loongson_pm_ops = {
+        .valid  = loongson_pm_valid_state,
+        .enter  = loongson_pm_enter,
+};
+
+static int __init loongson_pm_init(void)
+{
+        suspend_set_ops(&loongson_pm_ops);
+
+        return 0;
+}
+arch_initcall(loongson_pm_init);