MIPS: PM: Add CPU PM callbacks for general CPU context

Add a CPU power management notifier callback for preserving general CPU
context. The CPU PM callbacks will be triggered by the powering down of
CPU cores, for example by cpuidle drivers & in the future by suspend to
RAM implementations.

The current state preserved is mostly related to the process context:
- FPU
- DSP
- ASID
- UserLocal
- Watch registers

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/arch/mips/kernel/pm.c b/arch/mips/kernel/pm.c
new file mode 100644
index 000000000000..112903f36b89
--- /dev/null
+++ b/arch/mips/kernel/pm.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2014 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * CPU PM notifiers for saving/restoring general CPU state.
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/init.h>
+
+#include <asm/dsp.h>
+#include <asm/fpu.h>
+#include <asm/mmu_context.h>
+#include <asm/watch.h>
+
+/**
+ * mips_cpu_save() - Save general CPU state.
+ * Ensures that general CPU context is saved, notably FPU and DSP.
+ */
+static int mips_cpu_save(void)
+{
+        /* Save FPU state */
+        lose_fpu(1);
+
+        /* Save DSP state */
+        save_dsp(current);
+
+        return 0;
+}
+
+/**
+ * mips_cpu_restore() - Restore general CPU state.
+ * Restores important CPU context.
+ */
+static void mips_cpu_restore(void)
+{
+        unsigned int cpu = smp_processor_id();
+
+        /* Restore ASID */
+        if (current->mm)
+                write_c0_entryhi(cpu_asid(cpu, current->mm));
+
+        /* Restore DSP state */
+        restore_dsp(current);
+
+        /* Restore UserLocal */
+        if (cpu_has_userlocal)
+                write_c0_userlocal(current_thread_info()->tp_value);
+
+        /* Restore watch registers */
+        __restore_watch();
+}
+
+/**
+ * mips_pm_notifier() - Notifier for preserving general CPU context.
+ * @self:       Notifier block.
+ * @cmd:        CPU PM event.
+ * @v:          Private data (unused).
+ *
+ * This is called when a CPU power management event occurs, and is used to
+ * ensure that important CPU context is preserved across a CPU power down.
+ */
+static int mips_pm_notifier(struct notifier_block *self, unsigned long cmd,
+                            void *v)
+{
+        int ret;
+
+        switch (cmd) {
+        case CPU_PM_ENTER:
+                ret = mips_cpu_save();
+                if (ret)
+                        return NOTIFY_STOP;
+                break;
+        case CPU_PM_ENTER_FAILED:
+        case CPU_PM_EXIT:
+                mips_cpu_restore();
+                break;
+        }
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block mips_pm_notifier_block = {
+        .notifier_call = mips_pm_notifier,
+};
+
+static int __init mips_pm_init(void)
+{
+        return cpu_pm_register_notifier(&mips_pm_notifier_block);
+}
+arch_initcall(mips_pm_init);