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8ab89567 SN |
1 | /* |
2 | * Intel I/OAT DMA Linux driver | |
2ed6dc34 | 3 | * Copyright(c) 2007 Intel Corporation. |
8ab89567 SN |
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> | |
2ed6dc34 | 32 | #include <linux/dca.h> |
8ab89567 SN |
33 | #include "ioatdma.h" |
34 | #include "ioatdma_registers.h" | |
35 | #include "ioatdma_hw.h" | |
36 | ||
5149fd01 | 37 | MODULE_VERSION(IOAT_DMA_VERSION); |
8ab89567 SN |
38 | MODULE_LICENSE("GPL"); |
39 | MODULE_AUTHOR("Intel Corporation"); | |
40 | ||
41 | static struct pci_device_id ioat_pci_tbl[] = { | |
42 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, | |
43 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, | |
44 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, | |
45 | { PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, | |
46 | { 0, } | |
47 | }; | |
48 | ||
49 | struct ioat_device { | |
50 | struct pci_dev *pdev; | |
51 | void __iomem *iobase; | |
52 | struct ioatdma_device *dma; | |
2ed6dc34 | 53 | struct dca_provider *dca; |
8ab89567 SN |
54 | }; |
55 | ||
56 | static int __devinit ioat_probe(struct pci_dev *pdev, | |
57 | const struct pci_device_id *id); | |
8ab89567 | 58 | static void __devexit ioat_remove(struct pci_dev *pdev); |
8ab89567 | 59 | |
2ed6dc34 SN |
60 | static int ioat_dca_enabled = 1; |
61 | module_param(ioat_dca_enabled, int, 0644); | |
62 | MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); | |
63 | ||
8ab89567 SN |
64 | static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase) |
65 | { | |
66 | struct ioat_device *device = pci_get_drvdata(pdev); | |
67 | u8 version; | |
68 | int err = 0; | |
69 | ||
70 | version = readb(iobase + IOAT_VER_OFFSET); | |
71 | switch (version) { | |
72 | case IOAT_VER_1_2: | |
73 | device->dma = ioat_dma_probe(pdev, iobase); | |
dfe2299e | 74 | if (device->dma && ioat_dca_enabled) |
2ed6dc34 | 75 | device->dca = ioat_dca_init(pdev, iobase); |
8ab89567 SN |
76 | break; |
77 | default: | |
78 | err = -ENODEV; | |
79 | break; | |
80 | } | |
81 | return err; | |
82 | } | |
83 | ||
84 | static void ioat_shutdown_functionality(struct pci_dev *pdev) | |
85 | { | |
86 | struct ioat_device *device = pci_get_drvdata(pdev); | |
87 | ||
5149fd01 | 88 | dev_err(&pdev->dev, "Removing dma and dca services\n"); |
2ed6dc34 SN |
89 | if (device->dca) { |
90 | unregister_dca_provider(device->dca); | |
91 | free_dca_provider(device->dca); | |
92 | device->dca = NULL; | |
93 | } | |
94 | ||
dfe2299e SN |
95 | if (device->dma) { |
96 | ioat_dma_remove(device->dma); | |
97 | device->dma = NULL; | |
98 | } | |
8ab89567 SN |
99 | } |
100 | ||
7df7cf06 | 101 | static struct pci_driver ioat_pci_driver = { |
8ab89567 SN |
102 | .name = "ioatdma", |
103 | .id_table = ioat_pci_tbl, | |
104 | .probe = ioat_probe, | |
105 | .shutdown = ioat_shutdown_functionality, | |
8ab89567 | 106 | .remove = __devexit_p(ioat_remove), |
8ab89567 SN |
107 | }; |
108 | ||
109 | static int __devinit ioat_probe(struct pci_dev *pdev, | |
110 | const struct pci_device_id *id) | |
111 | { | |
112 | void __iomem *iobase; | |
113 | struct ioat_device *device; | |
114 | unsigned long mmio_start, mmio_len; | |
115 | int err; | |
116 | ||
117 | err = pci_enable_device(pdev); | |
118 | if (err) | |
119 | goto err_enable_device; | |
120 | ||
7df7cf06 | 121 | err = pci_request_regions(pdev, ioat_pci_driver.name); |
8ab89567 SN |
122 | if (err) |
123 | goto err_request_regions; | |
124 | ||
125 | err = pci_set_dma_mask(pdev, DMA_64BIT_MASK); | |
126 | if (err) | |
127 | err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); | |
128 | if (err) | |
129 | goto err_set_dma_mask; | |
130 | ||
131 | err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK); | |
132 | if (err) | |
133 | err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK); | |
134 | if (err) | |
135 | goto err_set_dma_mask; | |
136 | ||
137 | mmio_start = pci_resource_start(pdev, 0); | |
138 | mmio_len = pci_resource_len(pdev, 0); | |
139 | iobase = ioremap(mmio_start, mmio_len); | |
140 | if (!iobase) { | |
141 | err = -ENOMEM; | |
142 | goto err_ioremap; | |
143 | } | |
144 | ||
145 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
146 | if (!device) { | |
147 | err = -ENOMEM; | |
148 | goto err_kzalloc; | |
149 | } | |
150 | device->pdev = pdev; | |
151 | pci_set_drvdata(pdev, device); | |
152 | device->iobase = iobase; | |
153 | ||
154 | pci_set_master(pdev); | |
155 | ||
156 | err = ioat_setup_functionality(pdev, iobase); | |
157 | if (err) | |
158 | goto err_version; | |
159 | ||
160 | return 0; | |
161 | ||
162 | err_version: | |
163 | kfree(device); | |
164 | err_kzalloc: | |
165 | iounmap(iobase); | |
166 | err_ioremap: | |
167 | err_set_dma_mask: | |
168 | pci_release_regions(pdev); | |
169 | pci_disable_device(pdev); | |
170 | err_request_regions: | |
171 | err_enable_device: | |
172 | return err; | |
173 | } | |
174 | ||
8ab89567 SN |
175 | /* |
176 | * It is unsafe to remove this module: if removed while a requested | |
177 | * dma is outstanding, esp. from tcp, it is possible to hang while | |
7df7cf06 SN |
178 | * waiting for something that will never finish. However, if you're |
179 | * feeling lucky, this usually works just fine. | |
8ab89567 SN |
180 | */ |
181 | static void __devexit ioat_remove(struct pci_dev *pdev) | |
182 | { | |
183 | struct ioat_device *device = pci_get_drvdata(pdev); | |
184 | ||
185 | ioat_shutdown_functionality(pdev); | |
186 | ||
187 | kfree(device); | |
8ab89567 | 188 | } |
8ab89567 SN |
189 | |
190 | static int __init ioat_init_module(void) | |
191 | { | |
7df7cf06 | 192 | return pci_register_driver(&ioat_pci_driver); |
8ab89567 SN |
193 | } |
194 | module_init(ioat_init_module); | |
195 | ||
196 | static void __exit ioat_exit_module(void) | |
197 | { | |
7df7cf06 | 198 | pci_unregister_driver(&ioat_pci_driver); |
8ab89567 SN |
199 | } |
200 | module_exit(ioat_exit_module); |