1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat.c
new file mode 100644
index 000000000000..ae5817bfc015
--- /dev/null
+++ b/drivers/dma/ioat.c
@@ -0,0 +1,196 @@
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2007 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ */
+
+/*
+ * This driver supports an Intel I/OAT DMA engine, which does asynchronous
+ * copy operations.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include "ioatdma.h"
+#include "ioatdma_registers.h"
+#include "ioatdma_hw.h"
+
+MODULE_VERSION("1.24");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Intel Corporation");
+
+static struct pci_device_id ioat_pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
+        { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
+        { 0, }
+};
+
+struct ioat_device {
+        struct pci_dev          *pdev;
+        void __iomem            *iobase;
+        struct ioatdma_device   *dma;
+};
+
+static int __devinit ioat_probe(struct pci_dev *pdev,
+                                const struct pci_device_id *id);
+#ifdef IOAT_DMA_REMOVE
+static void __devexit ioat_remove(struct pci_dev *pdev);
+#endif
+
+static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
+{
+        struct ioat_device *device = pci_get_drvdata(pdev);
+        u8 version;
+        int err = 0;
+
+        version = readb(iobase + IOAT_VER_OFFSET);
+        switch (version) {
+        case IOAT_VER_1_2:
+                device->dma = ioat_dma_probe(pdev, iobase);
+                break;
+        default:
+                err = -ENODEV;
+                break;
+        }
+        return err;
+}
+
+static void ioat_shutdown_functionality(struct pci_dev *pdev)
+{
+        struct ioat_device *device = pci_get_drvdata(pdev);
+
+        if (device->dma) {
+                ioat_dma_remove(device->dma);
+                device->dma = NULL;
+        }
+}
+
+static struct pci_driver ioat_pci_drv = {
+        .name           = "ioatdma",
+        .id_table       = ioat_pci_tbl,
+        .probe          = ioat_probe,
+        .shutdown       = ioat_shutdown_functionality,
+#ifdef IOAT_DMA_REMOVE
+        .remove         = __devexit_p(ioat_remove),
+#endif
+};
+
+static int __devinit ioat_probe(struct pci_dev *pdev,
+                                const struct pci_device_id *id)
+{
+        void __iomem *iobase;
+        struct ioat_device *device;
+        unsigned long mmio_start, mmio_len;
+        int err;
+
+        err = pci_enable_device(pdev);
+        if (err)
+                goto err_enable_device;
+
+        err = pci_request_regions(pdev, ioat_pci_drv.name);
+        if (err)
+                goto err_request_regions;
+
+        err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
+        if (err)
+                err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+        if (err)
+                goto err_set_dma_mask;
+
+        err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+        if (err)
+                err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+        if (err)
+                goto err_set_dma_mask;
+
+        mmio_start = pci_resource_start(pdev, 0);
+        mmio_len = pci_resource_len(pdev, 0);
+        iobase = ioremap(mmio_start, mmio_len);
+        if (!iobase) {
+                err = -ENOMEM;
+                goto err_ioremap;
+        }
+
+        device = kzalloc(sizeof(*device), GFP_KERNEL);
+        if (!device) {
+                err = -ENOMEM;
+                goto err_kzalloc;
+        }
+        device->pdev = pdev;
+        pci_set_drvdata(pdev, device);
+        device->iobase = iobase;
+
+        pci_set_master(pdev);
+
+        err = ioat_setup_functionality(pdev, iobase);
+        if (err)
+                goto err_version;
+
+        return 0;
+
+err_version:
+        kfree(device);
+err_kzalloc:
+        iounmap(iobase);
+err_ioremap:
+err_set_dma_mask:
+        pci_release_regions(pdev);
+        pci_disable_device(pdev);
+err_request_regions:
+err_enable_device:
+        return err;
+}
+
+#ifdef IOAT_DMA_REMOVE
+/*
+ * It is unsafe to remove this module: if removed while a requested
+ * dma is outstanding, esp. from tcp, it is possible to hang while
+ * waiting for something that will never finish, thus hanging at
+ * least one cpu.  However, if you're feeling lucky and need to do
+ * some testing, this usually works just fine.
+ */
+static void __devexit ioat_remove(struct pci_dev *pdev)
+{
+        struct ioat_device *device = pci_get_drvdata(pdev);
+
+        ioat_shutdown_functionality(pdev);
+
+        kfree(device);
+
+        iounmap(device->iobase);
+        pci_release_regions(pdev);
+        pci_disable_device(pdev);
+}
+#endif
+
+static int __init ioat_init_module(void)
+{
+        return pci_register_driver(&ioat_pci_drv);
+}
+module_init(ioat_init_module);
+
+static void __exit ioat_exit_module(void)
+{
+        pci_unregister_driver(&ioat_pci_drv);
+}
+module_exit(ioat_exit_module);