1 files changed, 103 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/ubicom32ring.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/ubicom32ring.h
new file mode 100644
index 000000000..dd9c8f76c
--- /dev/null
+++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/ubicom32ring.h
@@ -0,0 +1,103 @@
+/*
+ * arch/ubicom32/include/asm/ubicom32ring.h
+ * Userspace I/O platform driver for Ubicom32 ring buffers
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port 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.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _ASM_UBICOM32_UBICOM32RING_H
+#define _ASM_UBICOM32_UBICOM32RING_H
+
+#define UIO_UBICOM32RING_REG_VERSION	2
+
+struct uio_ubicom32ring_desc {
+	volatile unsigned int		head;
+	volatile unsigned int		tail;
+	unsigned int			entries;
+	volatile unsigned int		ring[0];
+};
+
+struct uio_ubicom32ring_regs {
+	unsigned int			version;
+
+	/*
+	 * Magic type used to identify the ring set.  Each driver will
+	 * have a different magic value.
+	 */
+	unsigned int			magic;
+
+	/*
+	 * Registers defined by the driver
+	 */
+	unsigned int			regs_size;
+	void				*regs;
+
+	/*
+	 * The locations of the rings
+	 *
+	 * DO NOT ADD ANYTHING BELOW THIS LINE
+	 */
+	unsigned int			num_rings;
+	struct uio_ubicom32ring_desc	*rings[0];
+};
+
+/*
+ * ringtio_ring_flush
+ */
+static inline void ringtio_ring_flush(struct uio_ubicom32ring_desc *rd)
+{
+	rd->head = rd->tail = 0;
+}
+
+/*
+ * ringtio_ring_get
+ */
+static inline int ringtio_ring_get(struct uio_ubicom32ring_desc *rd, void **val)
+{
+	if (rd->head == rd->tail) {
+		return 0;
+	}
+
+	*val = (void *)rd->ring[rd->head++];
+	if (rd->head == rd->entries) {
+		rd->head = 0;
+	}
+	return 1;
+}
+
+/*
+ * ringtio_ring_put
+ */
+static inline int ringtio_ring_put(struct uio_ubicom32ring_desc *rd, void *val)
+{
+	unsigned int newtail = rd->tail + 1;
+	if (newtail == rd->entries) {
+		newtail = 0;
+	}
+
+	if (newtail == rd->head) {
+		return 0;
+	}
+
+	rd->ring[rd->tail] = (unsigned int)val;
+	rd->tail = newtail;
+	return 1;
+}
+
+#endif /* _ASM_UBICOM32_UBICOM32RING_H */