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-rw-r--r--arch/unicore32/kernel/pm.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/unicore32/kernel/pm.c b/arch/unicore32/kernel/pm.c
new file mode 100644
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+++ b/arch/unicore32/kernel/pm.c
@@ -0,0 +1,123 @@
+/*
+ * linux/arch/unicore32/kernel/pm.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ * Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/pm.h>
+
+#include "setup.h"
+
+struct puv3_cpu_pm_fns *puv3_cpu_pm_fns;
+static unsigned long *sleep_save;
+
+int puv3_pm_enter(suspend_state_t state)
+{
+ unsigned long sleep_save_checksum = 0, checksum = 0;
+ int i;
+
+ /* skip registers saving for standby */
+ if (state != PM_SUSPEND_STANDBY) {
+ puv3_cpu_pm_fns->save(sleep_save);
+ /* before sleeping, calculate and save a checksum */
+ for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
+ sleep_save_checksum += sleep_save[i];
+ }
+
+ /* *** go zzz *** */
+ puv3_cpu_pm_fns->enter(state);
+ cpu_init();
+#ifdef CONFIG_INPUT_KEYBOARD
+ puv3_ps2_init();
+#endif
+#ifdef CONFIG_PCI
+ pci_puv3_preinit();
+#endif
+ if (state != PM_SUSPEND_STANDBY) {
+ /* after sleeping, validate the checksum */
+ for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
+ checksum += sleep_save[i];
+
+ /* if invalid, display message and wait for a hardware reset */
+ if (checksum != sleep_save_checksum) {
+ while (1)
+ puv3_cpu_pm_fns->enter(state);
+ }
+ puv3_cpu_pm_fns->restore(sleep_save);
+ }
+
+ pr_debug("*** made it back from resume\n");
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(puv3_pm_enter);
+
+unsigned long sleep_phys_sp(void *sp)
+{
+ return virt_to_phys(sp);
+}
+
+static int puv3_pm_valid(suspend_state_t state)
+{
+ if (puv3_cpu_pm_fns)
+ return puv3_cpu_pm_fns->valid(state);
+
+ return -EINVAL;
+}
+
+static int puv3_pm_prepare(void)
+{
+ int ret = 0;
+
+ if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare)
+ ret = puv3_cpu_pm_fns->prepare();
+
+ return ret;
+}
+
+static void puv3_pm_finish(void)
+{
+ if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish)
+ puv3_cpu_pm_fns->finish();
+}
+
+static struct platform_suspend_ops puv3_pm_ops = {
+ .valid = puv3_pm_valid,
+ .enter = puv3_pm_enter,
+ .prepare = puv3_pm_prepare,
+ .finish = puv3_pm_finish,
+};
+
+static int __init puv3_pm_init(void)
+{
+ if (!puv3_cpu_pm_fns) {
+ printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n");
+ return -EINVAL;
+ }
+
+ sleep_save = kmalloc(puv3_cpu_pm_fns->save_count
+ * sizeof(unsigned long), GFP_KERNEL);
+ if (!sleep_save) {
+ printk(KERN_ERR "failed to alloc memory for pm save\n");
+ return -ENOMEM;
+ }
+
+ suspend_set_ops(&puv3_pm_ops);
+ return 0;
+}
+
+device_initcall(puv3_pm_init);
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