1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_doorbell.h b/drivers/infiniband/hw/mthca/mthca_doorbell.h
new file mode 100644
index 000000000..14f51ef97
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_doorbell.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/types.h>
+
+#define MTHCA_RD_DOORBELL      0x00
+#define MTHCA_SEND_DOORBELL    0x10
+#define MTHCA_RECEIVE_DOORBELL 0x18
+#define MTHCA_CQ_DOORBELL      0x20
+#define MTHCA_EQ_DOORBELL      0x28
+
+#if BITS_PER_LONG == 64
+/*
+ * Assume that we can just write a 64-bit doorbell atomically.  s390
+ * actually doesn't have writeq() but S/390 systems don't even have
+ * PCI so we won't worry about it.
+ */
+
+#define MTHCA_DECLARE_DOORBELL_LOCK(name)
+#define MTHCA_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
+#define MTHCA_GET_DOORBELL_LOCK(ptr)      (NULL)
+
+static inline void mthca_write64_raw(__be64 val, void __iomem *dest)
+{
+	__raw_writeq((__force u64) val, dest);
+}
+
+static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest,
+				 spinlock_t *doorbell_lock)
+{
+	__raw_writeq((__force u64) cpu_to_be64((u64) hi << 32 | lo), dest);
+}
+
+static inline void mthca_write_db_rec(__be32 val[2], __be32 *db)
+{
+	*(u64 *) db = *(u64 *) val;
+}
+
+#else
+
+/*
+ * Just fall back to a spinlock to protect the doorbell if
+ * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
+ * MMIO writes.
+ */
+
+#define MTHCA_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
+#define MTHCA_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)
+#define MTHCA_GET_DOORBELL_LOCK(ptr)      (ptr)
+
+static inline void mthca_write64_raw(__be64 val, void __iomem *dest)
+{
+	__raw_writel(((__force u32 *) &val)[0], dest);
+	__raw_writel(((__force u32 *) &val)[1], dest + 4);
+}
+
+static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest,
+				 spinlock_t *doorbell_lock)
+{
+	unsigned long flags;
+
+	hi = (__force u32) cpu_to_be32(hi);
+	lo = (__force u32) cpu_to_be32(lo);
+
+	spin_lock_irqsave(doorbell_lock, flags);
+	__raw_writel(hi, dest);
+	__raw_writel(lo, dest + 4);
+	spin_unlock_irqrestore(doorbell_lock, flags);
+}
+
+static inline void mthca_write_db_rec(__be32 val[2], __be32 *db)
+{
+	db[0] = val[0];
+	wmb();
+	db[1] = val[1];
+}
+
+#endif