Initial commit

1 files changed, 113 insertions, 0 deletions

diff --git a/sources/xdma_driver/xdma/cdev_events.c b/sources/xdma_driver/xdma/cdev_events.c
new file mode 100644
index 0000000..3ada7db
--- /dev/null
+++ b/sources/xdma_driver/xdma/cdev_events.c
@@ -0,0 +1,113 @@
+/*
+ * This file is part of the Xilinx DMA IP Core driver for Linux
+ *
+ * Copyright (c) 2016-present,  Xilinx, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+#define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include "xdma_cdev.h"
+
+/*
+ * character device file operations for events
+ */
+static ssize_t char_events_read(struct file *file, char __user *buf,
+		size_t count, loff_t *pos)
+{
+	int rv;
+	struct xdma_user_irq *user_irq;
+	struct xdma_cdev *xcdev = (struct xdma_cdev *)file->private_data;
+	u32 events_user;
+	unsigned long flags;
+
+	rv = xcdev_check(__func__, xcdev, 0);
+	if (rv < 0)
+		return rv;	
+	user_irq = xcdev->user_irq;
+	if (!user_irq) {
+		pr_info("xcdev 0x%p, user_irq NULL.\n", xcdev);
+		return -EINVAL;
+	}
+
+	if (count != 4)
+		return -EPROTO;
+
+	if (*pos & 3)
+		return -EPROTO;
+
+	/*
+	 * sleep until any interrupt events have occurred,
+	 * or a signal arrived
+	 */
+	rv = wait_event_interruptible(user_irq->events_wq,
+			user_irq->events_irq != 0);
+	if (rv)
+		dbg_sg("wait_event_interruptible=%d\n", rv);
+
+	/* wait_event_interruptible() was interrupted by a signal */
+	if (rv == -ERESTARTSYS)
+		return -ERESTARTSYS;
+
+	/* atomically decide which events are passed to the user */
+	spin_lock_irqsave(&user_irq->events_lock, flags);
+	events_user = user_irq->events_irq;
+	user_irq->events_irq = 0;
+	spin_unlock_irqrestore(&user_irq->events_lock, flags);
+
+	rv = copy_to_user(buf, &events_user, 4);
+	if (rv)
+		dbg_sg("Copy to user failed but continuing\n");
+
+	return 4;
+}
+
+static unsigned int char_events_poll(struct file *file, poll_table *wait)
+{
+	struct xdma_user_irq *user_irq;
+	struct xdma_cdev *xcdev = (struct xdma_cdev *)file->private_data;
+	unsigned long flags;
+	unsigned int mask = 0;
+	int rv;
+
+	rv = xcdev_check(__func__, xcdev, 0);
+	if (rv < 0)
+		return rv;	
+	user_irq = xcdev->user_irq;
+	if (!user_irq) {
+		pr_info("xcdev 0x%p, user_irq NULL.\n", xcdev);
+		return -EINVAL;
+	}
+
+	poll_wait(file, &user_irq->events_wq,  wait);
+
+	spin_lock_irqsave(&user_irq->events_lock, flags);
+	if (user_irq->events_irq)
+		mask = POLLIN | POLLRDNORM;	/* readable */
+
+	spin_unlock_irqrestore(&user_irq->events_lock, flags);
+
+	return mask;
+}
+
+/*
+ * character device file operations for the irq events
+ */
+static const struct file_operations events_fops = {
+	.owner = THIS_MODULE,
+	.open = char_open,
+	.release = char_close,
+	.read = char_events_read,
+	.poll = char_events_poll,
+};
+
+void cdev_event_init(struct xdma_cdev *xcdev)
+{
+	xcdev->user_irq = &(xcdev->xdev->user_irq[xcdev->bar]);
+	cdev_init(&xcdev->cdev, &events_fops);
+}