[I/OAT]: Driver for the Intel(R) I/OAT DMA engine

Adds a new ioatdma driver

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
new file mode 100644
index 000000000000..312353d12af2
--- /dev/null
+++ b/drivers/dma/ioatdma.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
+ *
+ * This program 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.
+ *
+ * This program 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
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+#ifndef IOATDMA_H
+#define IOATDMA_H
+
+#include <linux/dmaengine.h>
+#include "ioatdma_hw.h"
+#include <linux/init.h>
+#include <linux/dmapool.h>
+#include <linux/cache.h>
+
+#define PCI_DEVICE_ID_INTEL_IOAT        0x1a38
+
+#define IOAT_LOW_COMPLETION_MASK        0xffffffc0
+
+extern struct list_head dma_device_list;
+extern struct list_head dma_client_list;
+
+/**
+ * struct ioat_device - internal representation of a IOAT device
+ * @pdev: PCI-Express device
+ * @reg_base: MMIO register space base address
+ * @dma_pool: for allocating DMA descriptors
+ * @common: embedded struct dma_device
+ * @msi: Message Signaled Interrupt number
+ */
+
+struct ioat_device {
+        struct pci_dev *pdev;
+        void *reg_base;
+        struct pci_pool *dma_pool;
+        struct pci_pool *completion_pool;
+
+        struct dma_device common;
+        u8 msi;
+};
+
+/**
+ * struct ioat_dma_chan - internal representation of a DMA channel
+ * @device:
+ * @reg_base:
+ * @sw_in_use:
+ * @completion:
+ * @completion_low:
+ * @completion_high:
+ * @completed_cookie: last cookie seen completed on cleanup
+ * @cookie: value of last cookie given to client
+ * @last_completion:
+ * @xfercap:
+ * @desc_lock:
+ * @free_desc:
+ * @used_desc:
+ * @resource:
+ * @device_node:
+ */
+
+struct ioat_dma_chan {
+
+        void *reg_base;
+
+        dma_cookie_t completed_cookie;
+        unsigned long last_completion;
+
+        u32 xfercap;    /* XFERCAP register value expanded out */
+
+        spinlock_t cleanup_lock;
+        spinlock_t desc_lock;
+        struct list_head free_desc;
+        struct list_head used_desc;
+
+        int pending;
+
+        struct ioat_device *device;
+        struct dma_chan common;
+
+        dma_addr_t completion_addr;
+        union {
+                u64 full; /* HW completion writeback */
+                struct {
+                        u32 low;
+                        u32 high;
+                };
+        } *completion_virt;
+};
+
+/* wrapper around hardware descriptor format + additional software fields */
+
+/**
+ * struct ioat_desc_sw - wrapper around hardware descriptor
+ * @hw: hardware DMA descriptor
+ * @node:
+ * @cookie:
+ * @phys:
+ */
+
+struct ioat_desc_sw {
+        struct ioat_dma_descriptor *hw;
+        struct list_head node;
+        dma_cookie_t cookie;
+        dma_addr_t phys;
+        DECLARE_PCI_UNMAP_ADDR(src)
+        DECLARE_PCI_UNMAP_LEN(src_len)
+        DECLARE_PCI_UNMAP_ADDR(dst)
+        DECLARE_PCI_UNMAP_LEN(dst_len)
+};
+
+#endif /* IOATDMA_H */
+