1 /*
2 * Intel I/OAT DMA Linux driver
3 * Copyright(c) 2007 - 2009 Intel Corporation.
4 *
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.
8 *
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
12 * more details.
13 *
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.
17 *
18 * The full GNU General Public License is included in this distribution in
19 * the file called "COPYING".
20 *
21 */
22
23 /*
24 * This driver supports an Intel I/OAT DMA engine, which does asynchronous
25 * copy operations.
26 */
27
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>
33 #include "ioatdma.h"
34 #include "ioatdma_registers.h"
35 #include "ioatdma_hw.h"
36
37 MODULE_VERSION(IOAT_DMA_VERSION);
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Intel Corporation");
40
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) },
47
48 /* I/OAT v2 platforms */
49 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
50
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) },
60 { 0, }
61 };
62
63 struct ioat_device {
64 struct pci_dev *pdev;
65 void __iomem *iobase;
66 struct ioatdma_device *dma;
67 struct dca_provider *dca;
68 };
69
70 static int __devinit ioat_probe(struct pci_dev *pdev,
71 const struct pci_device_id *id);
72 static void __devexit ioat_remove(struct pci_dev *pdev);
73
74 static int ioat_dca_enabled = 1;
75 module_param(ioat_dca_enabled, int, 0644);
76 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
77
78 static struct pci_driver ioat_pci_driver = {
79 .name = "ioatdma",
80 .id_table = ioat_pci_tbl,
81 .probe = ioat_probe,
82 .remove = __devexit_p(ioat_remove),
83 };
84
85 static int __devinit ioat_probe(struct pci_dev *pdev,
86 const struct pci_device_id *id)
87 {
88 void __iomem *iobase;
89 struct ioat_device *device;
90 unsigned long mmio_start, mmio_len;
91 int err;
92
93 err = pci_enable_device(pdev);
94 if (err)
95 goto err_enable_device;
96
97 err = pci_request_regions(pdev, ioat_pci_driver.name);
98 if (err)
99 goto err_request_regions;
100
101 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
102 if (err)
103 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
104 if (err)
105 goto err_set_dma_mask;
106
107 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
108 if (err)
109 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
110 if (err)
111 goto err_set_dma_mask;
112
113 mmio_start = pci_resource_start(pdev, 0);
114 mmio_len = pci_resource_len(pdev, 0);
115 iobase = ioremap(mmio_start, mmio_len);
116 if (!iobase) {
117 err = -ENOMEM;
118 goto err_ioremap;
119 }
120
121 device = kzalloc(sizeof(*device), GFP_KERNEL);
122 if (!device) {
123 err = -ENOMEM;
124 goto err_kzalloc;
125 }
126 device->pdev = pdev;
127 pci_set_drvdata(pdev, device);
128 device->iobase = iobase;
129
130 pci_set_master(pdev);
131
132 switch (readb(iobase + IOAT_VER_OFFSET)) {
133 case IOAT_VER_1_2:
134 device->dma = ioat_dma_probe(pdev, iobase);
135 if (device->dma && ioat_dca_enabled)
136 device->dca = ioat_dca_init(pdev, iobase);
137 break;
138 case IOAT_VER_2_0:
139 device->dma = ioat_dma_probe(pdev, iobase);
140 if (device->dma && ioat_dca_enabled)
141 device->dca = ioat2_dca_init(pdev, iobase);
142 break;
143 case IOAT_VER_3_0:
144 device->dma = ioat_dma_probe(pdev, iobase);
145 if (device->dma && ioat_dca_enabled)
146 device->dca = ioat3_dca_init(pdev, iobase);
147 break;
148 default:
149 err = -ENODEV;
150 break;
151 }
152 if (!device->dma)
153 err = -ENODEV;
154
155 if (err)
156 goto err_version;
157
158 return 0;
159
160 err_version:
161 kfree(device);
162 err_kzalloc:
163 iounmap(iobase);
164 err_ioremap:
165 err_set_dma_mask:
166 pci_release_regions(pdev);
167 pci_disable_device(pdev);
168 err_request_regions:
169 err_enable_device:
170 return err;
171 }
172
173 static void __devexit ioat_remove(struct pci_dev *pdev)
174 {
175 struct ioat_device *device = pci_get_drvdata(pdev);
176
177 dev_err(&pdev->dev, "Removing dma and dca services\n");
178 if (device->dca) {
179 unregister_dca_provider(device->dca);
180 free_dca_provider(device->dca);
181 device->dca = NULL;
182 }
183
184 if (device->dma) {
185 ioat_dma_remove(device->dma);
186 device->dma = NULL;
187 }
188
189 kfree(device);
190 }
191
192 static int __init ioat_init_module(void)
193 {
194 return pci_register_driver(&ioat_pci_driver);
195 }
196 module_init(ioat_init_module);
197
198 static void __exit ioat_exit_module(void)
199 {
200 pci_unregister_driver(&ioat_pci_driver);
201 }
202 module_exit(ioat_exit_module);
203
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