2 * Intel I/OAT DMA Linux driver
3 * Copyright(c) 2007 Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 * The full GNU General Public License is included in this distribution in
19 * the file called "COPYING".
24 * This driver supports an Intel I/OAT DMA engine, which does asynchronous
28 #include <linux/init.h>
29 #include <linux/module.h>
30 #include <linux/pci.h>
31 #include <linux/interrupt.h>
32 #include <linux/dca.h>
34 #include "ioatdma_registers.h"
35 #include "ioatdma_hw.h"
37 MODULE_VERSION("1.24");
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Intel Corporation");
41 static struct pci_device_id ioat_pci_tbl[] = {
42 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
43 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
44 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
45 { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
52 struct ioatdma_device *dma;
53 struct dca_provider *dca;
56 static int __devinit ioat_probe(struct pci_dev *pdev,
57 const struct pci_device_id *id);
58 static void __devexit ioat_remove(struct pci_dev *pdev);
60 static int ioat_dca_enabled = 1;
61 module_param(ioat_dca_enabled, int, 0644);
62 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
64 static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
66 struct ioat_device *device = pci_get_drvdata(pdev);
70 version = readb(iobase + IOAT_VER_OFFSET);
73 device->dma = ioat_dma_probe(pdev, iobase);
74 if (device->dma && ioat_dca_enabled)
75 device->dca = ioat_dca_init(pdev, iobase);
84 static void ioat_shutdown_functionality(struct pci_dev *pdev)
86 struct ioat_device *device = pci_get_drvdata(pdev);
89 unregister_dca_provider(device->dca);
90 free_dca_provider(device->dca);
95 ioat_dma_remove(device->dma);
100 static struct pci_driver ioat_pci_driver = {
102 .id_table = ioat_pci_tbl,
104 .shutdown = ioat_shutdown_functionality,
105 .remove = __devexit_p(ioat_remove),
108 static int __devinit ioat_probe(struct pci_dev *pdev,
109 const struct pci_device_id *id)
111 void __iomem *iobase;
112 struct ioat_device *device;
113 unsigned long mmio_start, mmio_len;
116 err = pci_enable_device(pdev);
118 goto err_enable_device;
120 err = pci_request_regions(pdev, ioat_pci_driver.name);
122 goto err_request_regions;
124 err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
126 err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
128 goto err_set_dma_mask;
130 err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
132 err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
134 goto err_set_dma_mask;
136 mmio_start = pci_resource_start(pdev, 0);
137 mmio_len = pci_resource_len(pdev, 0);
138 iobase = ioremap(mmio_start, mmio_len);
144 device = kzalloc(sizeof(*device), GFP_KERNEL);
150 pci_set_drvdata(pdev, device);
151 device->iobase = iobase;
153 pci_set_master(pdev);
155 err = ioat_setup_functionality(pdev, iobase);
167 pci_release_regions(pdev);
168 pci_disable_device(pdev);
175 * It is unsafe to remove this module: if removed while a requested
176 * dma is outstanding, esp. from tcp, it is possible to hang while
177 * waiting for something that will never finish. However, if you're
178 * feeling lucky, this usually works just fine.
180 static void __devexit ioat_remove(struct pci_dev *pdev)
182 struct ioat_device *device = pci_get_drvdata(pdev);
184 ioat_shutdown_functionality(pdev);
189 static int __init ioat_init_module(void)
191 return pci_register_driver(&ioat_pci_driver);
193 module_init(ioat_init_module);
195 static void __exit ioat_exit_module(void)
197 pci_unregister_driver(&ioat_pci_driver);
199 module_exit(ioat_exit_module);