mlx5: Add driver for Mellanox Connect-IB adapters
The driver is comprised of two kernel modules: mlx5_ib and mlx5_core.
This partitioning resembles what we have for mlx4, except that mlx5_ib
is the pci device driver and not mlx5_core.
mlx5_core is essentially a library that provides general functionality
that is intended to be used by other Mellanox devices that will be
introduced in the future. mlx5_ib has a similar role as any hardware
device under drivers/infiniband/hw.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
[ Merge in coccinelle fixes from Fengguang Wu <fengguang.wu@intel.com>.
- Roland ]
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/include/linux/mlx5/doorbell.h b/include/linux/mlx5/doorbell.h
new file mode 100644
index 0000000..163a818
--- /dev/null
+++ b/include/linux/mlx5/doorbell.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2013, Mellanox Technologies inc. 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.
+ */
+
+#ifndef MLX5_DOORBELL_H
+#define MLX5_DOORBELL_H
+
+#define MLX5_BF_OFFSET 0x800
+#define MLX5_CQ_DOORBELL 0x20
+
+#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 MLX5_DECLARE_DOORBELL_LOCK(name)
+#define MLX5_INIT_DOORBELL_LOCK(ptr) do { } while (0)
+#define MLX5_GET_DOORBELL_LOCK(ptr) (NULL)
+
+static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
+ spinlock_t *doorbell_lock)
+{
+ __raw_writeq(*(u64 *)val, dest);
+}
+
+#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 MLX5_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
+#define MLX5_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr)
+#define MLX5_GET_DOORBELL_LOCK(ptr) (ptr)
+
+static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
+ spinlock_t *doorbell_lock)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(doorbell_lock, flags);
+ __raw_writel((__force u32) val[0], dest);
+ __raw_writel((__force u32) val[1], dest + 4);
+ spin_unlock_irqrestore(doorbell_lock, flags);
+}
+
+#endif
+
+#endif /* MLX5_DOORBELL_H */