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("Dual BSD/GPL");
40 MODULE_AUTHOR("Intel Corporation");
42 static struct pci_device_id ioat_pci_tbl[] = {
43 /* I/OAT v1 platforms */
44 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
46 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
47 { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
49 /* I/OAT v2 platforms */
50 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
52 /* I/OAT v3 platforms */
53 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
54 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
55 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
56 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
57 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
58 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
59 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
60 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
62 /* I/OAT v3.2 platforms */
63 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
64 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
65 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
66 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
70 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
71 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
72 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
76 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
78 static int __devinit ioat_pci_probe(struct pci_dev *pdev,
79 const struct pci_device_id *id);
80 static void __devexit ioat_remove(struct pci_dev *pdev);
82 static int ioat_dca_enabled = 1;
83 module_param(ioat_dca_enabled, int, 0644);
84 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
86 struct kmem_cache *ioat2_cache;
88 #define DRV_NAME "ioatdma"
90 static struct pci_driver ioat_pci_driver = {
92 .id_table = ioat_pci_tbl,
93 .probe = ioat_pci_probe,
94 .remove = __devexit_p(ioat_remove),
97 static struct ioatdma_device *
98 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
100 struct device *dev = &pdev->dev;
101 struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
106 d->reg_base = iobase;
110 static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
112 void __iomem * const *iomap;
113 struct device *dev = &pdev->dev;
114 struct ioatdma_device *device;
117 err = pcim_enable_device(pdev);
121 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
124 iomap = pcim_iomap_table(pdev);
128 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
130 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
134 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
136 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
140 device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
144 pci_set_master(pdev);
146 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
149 pci_set_drvdata(pdev, device);
151 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
152 if (device->version == IOAT_VER_1_2)
153 err = ioat1_dma_probe(device, ioat_dca_enabled);
154 else if (device->version == IOAT_VER_2_0)
155 err = ioat2_dma_probe(device, ioat_dca_enabled);
156 else if (device->version >= IOAT_VER_3_0)
157 err = ioat3_dma_probe(device, ioat_dca_enabled);
162 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
169 static void __devexit ioat_remove(struct pci_dev *pdev)
171 struct ioatdma_device *device = pci_get_drvdata(pdev);
176 dev_err(&pdev->dev, "Removing dma and dca services\n");
178 unregister_dca_provider(device->dca, &pdev->dev);
179 free_dca_provider(device->dca);
182 ioat_dma_remove(device);
185 static int __init ioat_init_module(void)
189 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
190 DRV_NAME, IOAT_DMA_VERSION);
192 ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent),
193 0, SLAB_HWCACHE_ALIGN, NULL);
197 err = pci_register_driver(&ioat_pci_driver);
199 kmem_cache_destroy(ioat2_cache);
203 module_init(ioat_init_module);
205 static void __exit ioat_exit_module(void)
207 pci_unregister_driver(&ioat_pci_driver);
208 kmem_cache_destroy(ioat2_cache);
210 module_exit(ioat_exit_module);