3 files changed, 172 insertions, 0 deletions

diff --git a/arch/mips/loongson/Kconfig b/arch/mips/loongson/Kconfig
index a214127895f2..17e72fde908c 100644
--- a/arch/mips/loongson/Kconfig
+++ b/arch/mips/loongson/Kconfig
@@ -61,3 +61,8 @@ endchoice
 
 config CS5536
         bool
+
+config LOONGSON_SUSPEND
+        bool
+        default y
+        depends on CPU_SUPPORTS_CPUFREQ && SUSPEND
diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index a82527fdfb65..a21724d50e2c 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -16,3 +16,9 @@ obj-$(CONFIG_SERIAL_8250) += serial.o
 # space
 #
 obj-$(CONFIG_CS5536) += cs5536/
+
+#
+# Suspend Support
+#
+
+obj-$(CONFIG_LOONGSON_SUSPEND) += pm.o
diff --git a/arch/mips/loongson/common/pm.c b/arch/mips/loongson/common/pm.c
new file mode 100644
index 000000000000..b625fec8a4d5
--- /dev/null
+++ b/arch/mips/loongson/common/pm.c
@@ -0,0 +1,161 @@
+/*
+ * loongson-specific suspend support
+ *
+ *  Copyright (C) 2009 Lemote Inc.
+ *  Author: Wu Zhangjin <wuzj@lemote.com>
+ *
+ * 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.
+ */
+#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)
+{
+}
+
+/*
+ * Check wakeup events
+ */
+int __weak wakeup_loongson(void)
+{
+        return 1;
+}
+
+/*
+ * If the events are really what we want to wakeup the CPU, wake it up
+ * otherwise put the CPU asleep again.
+ */
+static void wait_for_wakeup_events(void)
+{
+        while (!wakeup_loongson())
+                LOONGSON_CHIPCFG0 &= ~0x7;
+}
+
+/*
+ * Stop all perf counters
+ *
+ * $24 is the control register of Loongson perf counter
+ */
+static inline void stop_perf_counters(void)
+{
+        __write_64bit_c0_register($24, 0, 0);
+}
+
+
+static void loongson_suspend_enter(void)
+{
+        static unsigned int cached_cpu_freq;
+
+        /* setup wakeup events via enabling the IRQs */
+        setup_wakeup_events();
+
+        stop_perf_counters();
+
+        cached_cpu_freq = LOONGSON_CHIPCFG0;
+
+        /* Put CPU into wait mode */
+        LOONGSON_CHIPCFG0 &= ~0x7;
+
+        /* wait for the given events to wakeup cpu from wait mode */
+        wait_for_wakeup_events();
+
+        LOONGSON_CHIPCFG0 = cached_cpu_freq;
+        mmiowb();
+}
+
+void __weak mach_suspend(void)
+{
+}
+
+void __weak mach_resume(void)
+{
+}
+
+static int loongson_pm_enter(suspend_state_t state)
+{
+        mach_suspend();
+
+        /* processor specific suspend */
+        loongson_suspend_enter();
+
+        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 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);