This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / arm / kernel / crunch.c

diff --git a/arch/arm/kernel/crunch.c b/arch/arm/kernel/crunch.c
new file mode 100644 (file)
index 0000000..cec8378
--- /dev/null
+++ b/arch/arm/kernel/crunch.c
@@ -0,0 +1,82 @@
+/*
+ * arch/arm/kernel/crunch.c
+ * Cirrus MaverickCrunch context switching and handling
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *
+ * 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/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <asm/arch/ep93xx-regs.h>
+#include <asm/thread_notify.h>
+#include <asm/io.h>
+
+struct crunch_state *crunch_owner;
+
+void crunch_task_release(struct thread_info *thread)
+{
+       local_irq_disable();
+       if (crunch_owner == &thread->crunchstate)
+               crunch_owner = NULL;
+       local_irq_enable();
+}
+
+static int crunch_enabled(u32 devcfg)
+{
+       return !!(devcfg & EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE);
+}
+
+static int crunch_do(struct notifier_block *self, unsigned long cmd, void *t)
+{
+       struct thread_info *thread = (struct thread_info *)t;
+       struct crunch_state *crunch_state;
+       u32 devcfg;
+
+       crunch_state = &thread->crunchstate;
+
+       switch (cmd) {
+       case THREAD_NOTIFY_FLUSH:
+               memset(crunch_state, 0, sizeof(*crunch_state));
+
+               /*
+                * FALLTHROUGH: Ensure we don't try to overwrite our newly
+                * initialised state information on the first fault.
+                */
+
+       case THREAD_NOTIFY_RELEASE:
+               crunch_task_release(thread);
+               break;
+
+       case THREAD_NOTIFY_SWITCH:
+               devcfg = __raw_readl(EP93XX_SYSCON_DEVICE_CONFIG);
+               if (crunch_enabled(devcfg) || crunch_owner == crunch_state) {
+                       devcfg ^= EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE;
+                       __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
+                       __raw_writel(devcfg, EP93XX_SYSCON_DEVICE_CONFIG);
+               }
+               break;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block crunch_notifier_block = {
+       .notifier_call  = crunch_do,
+};
+
+static int __init crunch_init(void)
+{
+       thread_register_notifier(&crunch_notifier_block);
+
+       return 0;
+}
+
+late_initcall(crunch_init);