2 * Intel I/OAT DMA Linux driver
3 * Copyright(c) 2007 - 2009 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>
35 #include "registers.h"
38 MODULE_VERSION(IOAT_DMA_VERSION);
39 MODULE_LICENSE("GPL");
40 MODULE_AUTHOR("Intel Corporation");
42 static struct pci_device_id ioat_pci_tbl[] = {
43 /* I/OAT v1 platforms */
44 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
45 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
46 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
47 { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
49 /* I/OAT v2 platforms */
50 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
52 /* I/OAT v3 platforms */
53 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
54 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
55 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
56 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
57 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
58 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
59 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
60 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
64 static int __devinit ioat_pci_probe(struct pci_dev *pdev,
65 const struct pci_device_id *id);
66 static void __devexit ioat_remove(struct pci_dev *pdev);
68 static int ioat_dca_enabled = 1;
69 module_param(ioat_dca_enabled, int, 0644);
70 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
72 #define DRV_NAME "ioatdma"
74 static struct pci_driver ioat_pci_driver = {
76 .id_table = ioat_pci_tbl,
77 .probe = ioat_pci_probe,
78 .remove = __devexit_p(ioat_remove),
81 static struct ioatdma_device *
82 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
84 struct device *dev = &pdev->dev;
85 struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
94 static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
96 void __iomem * const *iomap;
97 struct device *dev = &pdev->dev;
98 struct ioatdma_device *device;
101 err = pcim_enable_device(pdev);
105 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
108 iomap = pcim_iomap_table(pdev);
112 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
114 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
118 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
120 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
124 device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
128 pci_set_master(pdev);
130 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
133 pci_set_drvdata(pdev, device);
135 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
136 if (device->version == IOAT_VER_1_2)
137 err = ioat1_dma_probe(device, ioat_dca_enabled);
138 else if (device->version == IOAT_VER_2_0)
139 err = ioat2_dma_probe(device, ioat_dca_enabled);
140 else if (device->version >= IOAT_VER_3_0)
141 err = ioat3_dma_probe(device, ioat_dca_enabled);
146 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
153 static void __devexit ioat_remove(struct pci_dev *pdev)
155 struct ioatdma_device *device = pci_get_drvdata(pdev);
160 dev_err(&pdev->dev, "Removing dma and dca services\n");
162 unregister_dca_provider(device->dca);
163 free_dca_provider(device->dca);
166 ioat_dma_remove(device);
169 static int __init ioat_init_module(void)
171 return pci_register_driver(&ioat_pci_driver);
173 module_init(ioat_init_module);
175 static void __exit ioat_exit_module(void)
177 pci_unregister_driver(&ioat_pci_driver);
179 module_exit(ioat_exit_module);