avr32: nmi_enter() without nmi_exit()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / dma / ioat.c
blob9b16a3af9a0af6a9a377d0f10048216ac0f86510
1 /*
2 * Intel I/OAT DMA Linux driver
3 * Copyright(c) 2007 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
12 * more details.
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
25 * copy operations.
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"
37 MODULE_VERSION(IOAT_DMA_VERSION);
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Intel Corporation");
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) },
48 /* I/OAT v2 platforms */
49 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
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, }
63 struct ioat_device {
64 struct pci_dev *pdev;
65 void __iomem *iobase;
66 struct ioatdma_device *dma;
67 struct dca_provider *dca;
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);
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)");
78 static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
80 struct ioat_device *device = pci_get_drvdata(pdev);
81 u8 version;
82 int err = 0;
84 version = readb(iobase + IOAT_VER_OFFSET);
85 switch (version) {
86 case IOAT_VER_1_2:
87 device->dma = ioat_dma_probe(pdev, iobase);
88 if (device->dma && ioat_dca_enabled)
89 device->dca = ioat_dca_init(pdev, iobase);
90 break;
91 case IOAT_VER_2_0:
92 device->dma = ioat_dma_probe(pdev, iobase);
93 if (device->dma && ioat_dca_enabled)
94 device->dca = ioat2_dca_init(pdev, iobase);
95 break;
96 case IOAT_VER_3_0:
97 device->dma = ioat_dma_probe(pdev, iobase);
98 if (device->dma && ioat_dca_enabled)
99 device->dca = ioat3_dca_init(pdev, iobase);
100 break;
101 default:
102 err = -ENODEV;
103 break;
105 if (!device->dma)
106 err = -ENODEV;
107 return err;
110 static void ioat_shutdown_functionality(struct pci_dev *pdev)
112 struct ioat_device *device = pci_get_drvdata(pdev);
114 dev_err(&pdev->dev, "Removing dma and dca services\n");
115 if (device->dca) {
116 unregister_dca_provider(device->dca);
117 free_dca_provider(device->dca);
118 device->dca = NULL;
121 if (device->dma) {
122 ioat_dma_remove(device->dma);
123 device->dma = NULL;
127 static struct pci_driver ioat_pci_driver = {
128 .name = "ioatdma",
129 .id_table = ioat_pci_tbl,
130 .probe = ioat_probe,
131 .shutdown = ioat_shutdown_functionality,
132 .remove = __devexit_p(ioat_remove),
135 static int __devinit ioat_probe(struct pci_dev *pdev,
136 const struct pci_device_id *id)
138 void __iomem *iobase;
139 struct ioat_device *device;
140 unsigned long mmio_start, mmio_len;
141 int err;
143 err = pci_enable_device(pdev);
144 if (err)
145 goto err_enable_device;
147 err = pci_request_regions(pdev, ioat_pci_driver.name);
148 if (err)
149 goto err_request_regions;
151 err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
152 if (err)
153 err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
154 if (err)
155 goto err_set_dma_mask;
157 err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
158 if (err)
159 err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
160 if (err)
161 goto err_set_dma_mask;
163 mmio_start = pci_resource_start(pdev, 0);
164 mmio_len = pci_resource_len(pdev, 0);
165 iobase = ioremap(mmio_start, mmio_len);
166 if (!iobase) {
167 err = -ENOMEM;
168 goto err_ioremap;
171 device = kzalloc(sizeof(*device), GFP_KERNEL);
172 if (!device) {
173 err = -ENOMEM;
174 goto err_kzalloc;
176 device->pdev = pdev;
177 pci_set_drvdata(pdev, device);
178 device->iobase = iobase;
180 pci_set_master(pdev);
182 err = ioat_setup_functionality(pdev, iobase);
183 if (err)
184 goto err_version;
186 return 0;
188 err_version:
189 kfree(device);
190 err_kzalloc:
191 iounmap(iobase);
192 err_ioremap:
193 err_set_dma_mask:
194 pci_release_regions(pdev);
195 pci_disable_device(pdev);
196 err_request_regions:
197 err_enable_device:
198 return err;
202 * It is unsafe to remove this module: if removed while a requested
203 * dma is outstanding, esp. from tcp, it is possible to hang while
204 * waiting for something that will never finish. However, if you're
205 * feeling lucky, this usually works just fine.
207 static void __devexit ioat_remove(struct pci_dev *pdev)
209 struct ioat_device *device = pci_get_drvdata(pdev);
211 ioat_shutdown_functionality(pdev);
213 kfree(device);
216 static int __init ioat_init_module(void)
218 return pci_register_driver(&ioat_pci_driver);
220 module_init(ioat_init_module);
222 static void __exit ioat_exit_module(void)
224 pci_unregister_driver(&ioat_pci_driver);
226 module_exit(ioat_exit_module);