Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / tty / hvc / hvc_irq.c

diff --git a/kernel/drivers/tty/hvc/hvc_irq.c b/kernel/drivers/tty/hvc/hvc_irq.c
new file mode 100644 (file)
index 0000000..c9adb05
--- /dev/null
+++ b/kernel/drivers/tty/hvc/hvc_irq.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright IBM Corp. 2001,2008
+ *
+ * This file contains the IRQ specific code for hvc_console
+ *
+ */
+
+#include <linux/interrupt.h>
+
+#include "hvc_console.h"
+
+static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
+{
+       /* if hvc_poll request a repoll, then kick the hvcd thread */
+       if (hvc_poll(dev_instance))
+               hvc_kick();
+       return IRQ_HANDLED;
+}
+
+/*
+ * For IRQ based systems these callbacks can be used
+ */
+int notifier_add_irq(struct hvc_struct *hp, int irq)
+{
+       int rc;
+
+       if (!irq) {
+               hp->irq_requested = 0;
+               return 0;
+       }
+       rc = request_irq(irq, hvc_handle_interrupt, 0,
+                          "hvc_console", hp);
+       if (!rc)
+               hp->irq_requested = 1;
+       return rc;
+}
+
+void notifier_del_irq(struct hvc_struct *hp, int irq)
+{
+       if (!hp->irq_requested)
+               return;
+       free_irq(irq, hp);
+       hp->irq_requested = 0;
+}
+
+void notifier_hangup_irq(struct hvc_struct *hp, int irq)
+{
+       notifier_del_irq(hp, irq);
+}