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>
34 #include "registers.h"
37 MODULE_VERSION(IOAT_DMA_VERSION);
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Intel Corporation");
41 static struct pci_device_id ioat_pci_tbl[] = {
42 /* I/OAT v1 platforms */
43 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
44 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
45 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
46 { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
48 /* I/OAT v2 platforms */
49 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
51 /* I/OAT v3 platforms */
52 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
53 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
54 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
55 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
56 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
57 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
58 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
59 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
65 struct ioatdma_device *dma;
66 struct dca_provider *dca;
69 static int __devinit ioat_probe(struct pci_dev *pdev,
70 const struct pci_device_id *id);
71 static void __devexit ioat_remove(struct pci_dev *pdev);
73 static int ioat_dca_enabled = 1;
74 module_param(ioat_dca_enabled, int, 0644);
75 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
77 #define DRV_NAME "ioatdma"
79 static struct pci_driver ioat_pci_driver = {
81 .id_table = ioat_pci_tbl,
83 .remove = __devexit_p(ioat_remove),
86 static int __devinit ioat_probe(struct pci_dev *pdev,
87 const struct pci_device_id *id)
89 void __iomem * const *iomap;
91 struct device *dev = &pdev->dev;
92 struct ioat_device *device;
95 err = pcim_enable_device(pdev);
99 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
102 iomap = pcim_iomap_table(pdev);
106 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
108 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
112 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
114 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
118 device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
123 pci_set_drvdata(pdev, device);
124 iobase = iomap[IOAT_MMIO_BAR];
126 pci_set_master(pdev);
128 switch (readb(iobase + IOAT_VER_OFFSET)) {
130 device->dma = ioat_dma_probe(pdev, iobase);
131 if (device->dma && ioat_dca_enabled)
132 device->dca = ioat_dca_init(pdev, iobase);
135 device->dma = ioat_dma_probe(pdev, iobase);
136 if (device->dma && ioat_dca_enabled)
137 device->dca = ioat2_dca_init(pdev, iobase);
140 device->dma = ioat_dma_probe(pdev, iobase);
141 if (device->dma && ioat_dca_enabled)
142 device->dca = ioat3_dca_init(pdev, iobase);
149 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
156 static void __devexit ioat_remove(struct pci_dev *pdev)
158 struct ioat_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);
168 ioat_dma_remove(device->dma);
173 static int __init ioat_init_module(void)
175 return pci_register_driver(&ioat_pci_driver);
177 module_init(ioat_init_module);
179 static void __exit ioat_exit_module(void)
181 pci_unregister_driver(&ioat_pci_driver);
183 module_exit(ioat_exit_module);