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
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
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>
34 #include "ioatdma_registers.h"
35 #include "ioatdma_hw.h"
37 MODULE_VERSION("1.24");
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Intel Corporation");
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
) },
52 struct ioatdma_device
*dma
;
53 struct dca_provider
*dca
;
56 static int __devinit
ioat_probe(struct pci_dev
*pdev
,
57 const struct pci_device_id
*id
);
58 static void __devexit
ioat_remove(struct pci_dev
*pdev
);
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)");
64 static int ioat_setup_functionality(struct pci_dev
*pdev
, void __iomem
*iobase
)
66 struct ioat_device
*device
= pci_get_drvdata(pdev
);
70 version
= readb(iobase
+ IOAT_VER_OFFSET
);
73 device
->dma
= ioat_dma_probe(pdev
, iobase
);
74 if (device
->dma
&& ioat_dca_enabled
)
75 device
->dca
= ioat_dca_init(pdev
, iobase
);
84 static void ioat_shutdown_functionality(struct pci_dev
*pdev
)
86 struct ioat_device
*device
= pci_get_drvdata(pdev
);
89 unregister_dca_provider(device
->dca
);
90 free_dca_provider(device
->dca
);
95 ioat_dma_remove(device
->dma
);
100 static struct pci_driver ioat_pci_driver
= {
102 .id_table
= ioat_pci_tbl
,
104 .shutdown
= ioat_shutdown_functionality
,
105 .remove
= __devexit_p(ioat_remove
),
108 static int __devinit
ioat_probe(struct pci_dev
*pdev
,
109 const struct pci_device_id
*id
)
111 void __iomem
*iobase
;
112 struct ioat_device
*device
;
113 unsigned long mmio_start
, mmio_len
;
116 err
= pci_enable_device(pdev
);
118 goto err_enable_device
;
120 err
= pci_request_regions(pdev
, ioat_pci_driver
.name
);
122 goto err_request_regions
;
124 err
= pci_set_dma_mask(pdev
, DMA_64BIT_MASK
);
126 err
= pci_set_dma_mask(pdev
, DMA_32BIT_MASK
);
128 goto err_set_dma_mask
;
130 err
= pci_set_consistent_dma_mask(pdev
, DMA_64BIT_MASK
);
132 err
= pci_set_consistent_dma_mask(pdev
, DMA_32BIT_MASK
);
134 goto err_set_dma_mask
;
136 mmio_start
= pci_resource_start(pdev
, 0);
137 mmio_len
= pci_resource_len(pdev
, 0);
138 iobase
= ioremap(mmio_start
, mmio_len
);
144 device
= kzalloc(sizeof(*device
), GFP_KERNEL
);
150 pci_set_drvdata(pdev
, device
);
151 device
->iobase
= iobase
;
153 pci_set_master(pdev
);
155 err
= ioat_setup_functionality(pdev
, iobase
);
167 pci_release_regions(pdev
);
168 pci_disable_device(pdev
);
175 * It is unsafe to remove this module: if removed while a requested
176 * dma is outstanding, esp. from tcp, it is possible to hang while
177 * waiting for something that will never finish. However, if you're
178 * feeling lucky, this usually works just fine.
180 static void __devexit
ioat_remove(struct pci_dev
*pdev
)
182 struct ioat_device
*device
= pci_get_drvdata(pdev
);
184 ioat_shutdown_functionality(pdev
);
189 static int __init
ioat_init_module(void)
191 return pci_register_driver(&ioat_pci_driver
);
193 module_init(ioat_init_module
);
195 static void __exit
ioat_exit_module(void)
197 pci_unregister_driver(&ioat_pci_driver
);
199 module_exit(ioat_exit_module
);