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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[] = { | |
7bb67c14 | 42 | /* I/OAT v1 platforms */ |
8ab89567 SN |
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) }, | |
7bb67c14 SN |
47 | |
48 | /* I/OAT v2 platforms */ | |
49 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) }, | |
8ab89567 SN |
50 | { 0, } |
51 | }; | |
52 | ||
53 | struct ioat_device { | |
54 | struct pci_dev *pdev; | |
55 | void __iomem *iobase; | |
56 | struct ioatdma_device *dma; | |
2ed6dc34 | 57 | struct dca_provider *dca; |
8ab89567 SN |
58 | }; |
59 | ||
60 | static int __devinit ioat_probe(struct pci_dev *pdev, | |
61 | const struct pci_device_id *id); | |
8ab89567 | 62 | static void __devexit ioat_remove(struct pci_dev *pdev); |
8ab89567 | 63 | |
2ed6dc34 SN |
64 | static int ioat_dca_enabled = 1; |
65 | module_param(ioat_dca_enabled, int, 0644); | |
66 | MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); | |
67 | ||
8ab89567 SN |
68 | static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase) |
69 | { | |
70 | struct ioat_device *device = pci_get_drvdata(pdev); | |
71 | u8 version; | |
72 | int err = 0; | |
73 | ||
74 | version = readb(iobase + IOAT_VER_OFFSET); | |
75 | switch (version) { | |
76 | case IOAT_VER_1_2: | |
77 | device->dma = ioat_dma_probe(pdev, iobase); | |
dfe2299e | 78 | if (device->dma && ioat_dca_enabled) |
2ed6dc34 | 79 | device->dca = ioat_dca_init(pdev, iobase); |
8ab89567 | 80 | break; |
7bb67c14 SN |
81 | case IOAT_VER_2_0: |
82 | device->dma = ioat_dma_probe(pdev, iobase); | |
83 | if (device->dma && ioat_dca_enabled) | |
84 | device->dca = ioat2_dca_init(pdev, iobase); | |
85 | break; | |
8ab89567 SN |
86 | default: |
87 | err = -ENODEV; | |
88 | break; | |
89 | } | |
7bb67c14 SN |
90 | if (!device->dma) |
91 | err = -ENODEV; | |
8ab89567 SN |
92 | return err; |
93 | } | |
94 | ||
95 | static void ioat_shutdown_functionality(struct pci_dev *pdev) | |
96 | { | |
97 | struct ioat_device *device = pci_get_drvdata(pdev); | |
98 | ||
5149fd01 | 99 | dev_err(&pdev->dev, "Removing dma and dca services\n"); |
2ed6dc34 SN |
100 | if (device->dca) { |
101 | unregister_dca_provider(device->dca); | |
102 | free_dca_provider(device->dca); | |
103 | device->dca = NULL; | |
104 | } | |
105 | ||
dfe2299e SN |
106 | if (device->dma) { |
107 | ioat_dma_remove(device->dma); | |
108 | device->dma = NULL; | |
109 | } | |
8ab89567 SN |
110 | } |
111 | ||
7df7cf06 | 112 | static struct pci_driver ioat_pci_driver = { |
8ab89567 SN |
113 | .name = "ioatdma", |
114 | .id_table = ioat_pci_tbl, | |
115 | .probe = ioat_probe, | |
116 | .shutdown = ioat_shutdown_functionality, | |
8ab89567 | 117 | .remove = __devexit_p(ioat_remove), |
8ab89567 SN |
118 | }; |
119 | ||
120 | static int __devinit ioat_probe(struct pci_dev *pdev, | |
121 | const struct pci_device_id *id) | |
122 | { | |
123 | void __iomem *iobase; | |
124 | struct ioat_device *device; | |
125 | unsigned long mmio_start, mmio_len; | |
126 | int err; | |
127 | ||
128 | err = pci_enable_device(pdev); | |
129 | if (err) | |
130 | goto err_enable_device; | |
131 | ||
7df7cf06 | 132 | err = pci_request_regions(pdev, ioat_pci_driver.name); |
8ab89567 SN |
133 | if (err) |
134 | goto err_request_regions; | |
135 | ||
136 | err = pci_set_dma_mask(pdev, DMA_64BIT_MASK); | |
137 | if (err) | |
138 | err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); | |
139 | if (err) | |
140 | goto err_set_dma_mask; | |
141 | ||
142 | err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK); | |
143 | if (err) | |
144 | err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK); | |
145 | if (err) | |
146 | goto err_set_dma_mask; | |
147 | ||
148 | mmio_start = pci_resource_start(pdev, 0); | |
149 | mmio_len = pci_resource_len(pdev, 0); | |
150 | iobase = ioremap(mmio_start, mmio_len); | |
151 | if (!iobase) { | |
152 | err = -ENOMEM; | |
153 | goto err_ioremap; | |
154 | } | |
155 | ||
156 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
157 | if (!device) { | |
158 | err = -ENOMEM; | |
159 | goto err_kzalloc; | |
160 | } | |
161 | device->pdev = pdev; | |
162 | pci_set_drvdata(pdev, device); | |
163 | device->iobase = iobase; | |
164 | ||
165 | pci_set_master(pdev); | |
166 | ||
167 | err = ioat_setup_functionality(pdev, iobase); | |
168 | if (err) | |
169 | goto err_version; | |
170 | ||
171 | return 0; | |
172 | ||
173 | err_version: | |
174 | kfree(device); | |
175 | err_kzalloc: | |
176 | iounmap(iobase); | |
177 | err_ioremap: | |
178 | err_set_dma_mask: | |
179 | pci_release_regions(pdev); | |
180 | pci_disable_device(pdev); | |
181 | err_request_regions: | |
182 | err_enable_device: | |
183 | return err; | |
184 | } | |
185 | ||
8ab89567 SN |
186 | /* |
187 | * It is unsafe to remove this module: if removed while a requested | |
188 | * dma is outstanding, esp. from tcp, it is possible to hang while | |
7df7cf06 SN |
189 | * waiting for something that will never finish. However, if you're |
190 | * feeling lucky, this usually works just fine. | |
8ab89567 SN |
191 | */ |
192 | static void __devexit ioat_remove(struct pci_dev *pdev) | |
193 | { | |
194 | struct ioat_device *device = pci_get_drvdata(pdev); | |
195 | ||
196 | ioat_shutdown_functionality(pdev); | |
197 | ||
198 | kfree(device); | |
8ab89567 | 199 | } |
8ab89567 SN |
200 | |
201 | static int __init ioat_init_module(void) | |
202 | { | |
7df7cf06 | 203 | return pci_register_driver(&ioat_pci_driver); |
8ab89567 SN |
204 | } |
205 | module_init(ioat_init_module); | |
206 | ||
207 | static void __exit ioat_exit_module(void) | |
208 | { | |
7df7cf06 | 209 | pci_unregister_driver(&ioat_pci_driver); |
8ab89567 SN |
210 | } |
211 | module_exit(ioat_exit_module); |