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8ab89567 SN |
1 | /* |
2 | * Intel I/OAT DMA Linux driver | |
3 | * Copyright(c) 2004 - 2007 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 "ioatdma.h" | |
33 | #include "ioatdma_registers.h" | |
34 | #include "ioatdma_hw.h" | |
35 | ||
36 | MODULE_VERSION("1.24"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | MODULE_AUTHOR("Intel Corporation"); | |
39 | ||
40 | static struct pci_device_id ioat_pci_tbl[] = { | |
41 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, | |
42 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, | |
43 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, | |
44 | { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, | |
45 | { 0, } | |
46 | }; | |
47 | ||
48 | struct ioat_device { | |
49 | struct pci_dev *pdev; | |
50 | void __iomem *iobase; | |
51 | struct ioatdma_device *dma; | |
52 | }; | |
53 | ||
54 | static int __devinit ioat_probe(struct pci_dev *pdev, | |
55 | const struct pci_device_id *id); | |
56 | #ifdef IOAT_DMA_REMOVE | |
57 | static void __devexit ioat_remove(struct pci_dev *pdev); | |
58 | #endif | |
59 | ||
60 | static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase) | |
61 | { | |
62 | struct ioat_device *device = pci_get_drvdata(pdev); | |
63 | u8 version; | |
64 | int err = 0; | |
65 | ||
66 | version = readb(iobase + IOAT_VER_OFFSET); | |
67 | switch (version) { | |
68 | case IOAT_VER_1_2: | |
69 | device->dma = ioat_dma_probe(pdev, iobase); | |
70 | break; | |
71 | default: | |
72 | err = -ENODEV; | |
73 | break; | |
74 | } | |
75 | return err; | |
76 | } | |
77 | ||
78 | static void ioat_shutdown_functionality(struct pci_dev *pdev) | |
79 | { | |
80 | struct ioat_device *device = pci_get_drvdata(pdev); | |
81 | ||
82 | if (device->dma) { | |
83 | ioat_dma_remove(device->dma); | |
84 | device->dma = NULL; | |
85 | } | |
86 | } | |
87 | ||
88 | static struct pci_driver ioat_pci_drv = { | |
89 | .name = "ioatdma", | |
90 | .id_table = ioat_pci_tbl, | |
91 | .probe = ioat_probe, | |
92 | .shutdown = ioat_shutdown_functionality, | |
93 | #ifdef IOAT_DMA_REMOVE | |
94 | .remove = __devexit_p(ioat_remove), | |
95 | #endif | |
96 | }; | |
97 | ||
98 | static int __devinit ioat_probe(struct pci_dev *pdev, | |
99 | const struct pci_device_id *id) | |
100 | { | |
101 | void __iomem *iobase; | |
102 | struct ioat_device *device; | |
103 | unsigned long mmio_start, mmio_len; | |
104 | int err; | |
105 | ||
106 | err = pci_enable_device(pdev); | |
107 | if (err) | |
108 | goto err_enable_device; | |
109 | ||
110 | err = pci_request_regions(pdev, ioat_pci_drv.name); | |
111 | if (err) | |
112 | goto err_request_regions; | |
113 | ||
114 | err = pci_set_dma_mask(pdev, DMA_64BIT_MASK); | |
115 | if (err) | |
116 | err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); | |
117 | if (err) | |
118 | goto err_set_dma_mask; | |
119 | ||
120 | err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK); | |
121 | if (err) | |
122 | err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK); | |
123 | if (err) | |
124 | goto err_set_dma_mask; | |
125 | ||
126 | mmio_start = pci_resource_start(pdev, 0); | |
127 | mmio_len = pci_resource_len(pdev, 0); | |
128 | iobase = ioremap(mmio_start, mmio_len); | |
129 | if (!iobase) { | |
130 | err = -ENOMEM; | |
131 | goto err_ioremap; | |
132 | } | |
133 | ||
134 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
135 | if (!device) { | |
136 | err = -ENOMEM; | |
137 | goto err_kzalloc; | |
138 | } | |
139 | device->pdev = pdev; | |
140 | pci_set_drvdata(pdev, device); | |
141 | device->iobase = iobase; | |
142 | ||
143 | pci_set_master(pdev); | |
144 | ||
145 | err = ioat_setup_functionality(pdev, iobase); | |
146 | if (err) | |
147 | goto err_version; | |
148 | ||
149 | return 0; | |
150 | ||
151 | err_version: | |
152 | kfree(device); | |
153 | err_kzalloc: | |
154 | iounmap(iobase); | |
155 | err_ioremap: | |
156 | err_set_dma_mask: | |
157 | pci_release_regions(pdev); | |
158 | pci_disable_device(pdev); | |
159 | err_request_regions: | |
160 | err_enable_device: | |
161 | return err; | |
162 | } | |
163 | ||
164 | #ifdef IOAT_DMA_REMOVE | |
165 | /* | |
166 | * It is unsafe to remove this module: if removed while a requested | |
167 | * dma is outstanding, esp. from tcp, it is possible to hang while | |
168 | * waiting for something that will never finish, thus hanging at | |
169 | * least one cpu. However, if you're feeling lucky and need to do | |
170 | * some testing, this usually works just fine. | |
171 | */ | |
172 | static void __devexit ioat_remove(struct pci_dev *pdev) | |
173 | { | |
174 | struct ioat_device *device = pci_get_drvdata(pdev); | |
175 | ||
176 | ioat_shutdown_functionality(pdev); | |
177 | ||
178 | kfree(device); | |
179 | ||
180 | iounmap(device->iobase); | |
181 | pci_release_regions(pdev); | |
182 | pci_disable_device(pdev); | |
183 | } | |
184 | #endif | |
185 | ||
186 | static int __init ioat_init_module(void) | |
187 | { | |
188 | return pci_register_driver(&ioat_pci_drv); | |
189 | } | |
190 | module_init(ioat_init_module); | |
191 | ||
192 | static void __exit ioat_exit_module(void) | |
193 | { | |
194 | pci_unregister_driver(&ioat_pci_drv); | |
195 | } | |
196 | module_exit(ioat_exit_module); |