[net-next-2.6.git] / drivers / dma / ioat.c

/*
 * Intel I/OAT DMA Linux driver
 * Copyright(c) 2007 - 2009 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 */

/*
 * This driver supports an Intel I/OAT DMA engine, which does asynchronous
 * copy operations.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dca.h>
#include "ioatdma.h"
#include "ioatdma_registers.h"
#include "ioatdma_hw.h"

MODULE_VERSION(IOAT_DMA_VERSION);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Intel Corporation");

static struct pci_device_id ioat_pci_tbl[] = {
	/* I/OAT v1 platforms */
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB)  },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
	{ PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },

	/* I/OAT v2 platforms */
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },

	/* I/OAT v3 platforms */
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
	{ 0, }
};

struct ioat_device {
	struct pci_dev		*pdev;
	void __iomem		*iobase;
	struct ioatdma_device	*dma;
	struct dca_provider	*dca;
};

static int __devinit ioat_probe(struct pci_dev *pdev,
				const struct pci_device_id *id);
static void __devexit ioat_remove(struct pci_dev *pdev);

static int ioat_dca_enabled = 1;
module_param(ioat_dca_enabled, int, 0644);
MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");

static struct pci_driver ioat_pci_driver = {
	.name		= "ioatdma",
	.id_table	= ioat_pci_tbl,
	.probe		= ioat_probe,
	.remove		= __devexit_p(ioat_remove),
};

static int __devinit ioat_probe(struct pci_dev *pdev,
				const struct pci_device_id *id)
{
	void __iomem *iobase;
	struct ioat_device *device;
	unsigned long mmio_start, mmio_len;
	int err;

	err = pci_enable_device(pdev);
	if (err)
		goto err_enable_device;

	err = pci_request_regions(pdev, ioat_pci_driver.name);
	if (err)
		goto err_request_regions;

	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
	if (err)
		err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
	if (err)
		goto err_set_dma_mask;

	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
	if (err)
		err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
	if (err)
		goto err_set_dma_mask;

	mmio_start = pci_resource_start(pdev, 0);
	mmio_len = pci_resource_len(pdev, 0);
	iobase = ioremap(mmio_start, mmio_len);
	if (!iobase) {
		err = -ENOMEM;
		goto err_ioremap;
	}

	device = kzalloc(sizeof(*device), GFP_KERNEL);
	if (!device) {
		err = -ENOMEM;
		goto err_kzalloc;
	}
	device->pdev = pdev;
	pci_set_drvdata(pdev, device);
	device->iobase = iobase;

	pci_set_master(pdev);

	switch (readb(iobase + IOAT_VER_OFFSET)) {
	case IOAT_VER_1_2:
		device->dma = ioat_dma_probe(pdev, iobase);
		if (device->dma && ioat_dca_enabled)
			device->dca = ioat_dca_init(pdev, iobase);
		break;
	case IOAT_VER_2_0:
		device->dma = ioat_dma_probe(pdev, iobase);
		if (device->dma && ioat_dca_enabled)
			device->dca = ioat2_dca_init(pdev, iobase);
		break;
	case IOAT_VER_3_0:
		device->dma = ioat_dma_probe(pdev, iobase);
		if (device->dma && ioat_dca_enabled)
			device->dca = ioat3_dca_init(pdev, iobase);
		break;
	default:
		err = -ENODEV;
		break;
	}
	if (!device->dma)
		err = -ENODEV;

	if (err)
		goto err_version;

	return 0;

err_version:
	kfree(device);
err_kzalloc:
	iounmap(iobase);
err_ioremap:
err_set_dma_mask:
	pci_release_regions(pdev);
	pci_disable_device(pdev);
err_request_regions:
err_enable_device:
	return err;
}

static void __devexit ioat_remove(struct pci_dev *pdev)
{
	struct ioat_device *device = pci_get_drvdata(pdev);

	dev_err(&pdev->dev, "Removing dma and dca services\n");
	if (device->dca) {
		unregister_dca_provider(device->dca);
		free_dca_provider(device->dca);
		device->dca = NULL;
	}

	if (device->dma) {
		ioat_dma_remove(device->dma);
		device->dma = NULL;
	}

	kfree(device);
}

static int __init ioat_init_module(void)
{
	return pci_register_driver(&ioat_pci_driver);
}
module_init(ioat_init_module);

static void __exit ioat_exit_module(void)
{
	pci_unregister_driver(&ioat_pci_driver);
}
module_exit(ioat_exit_module);
Commit	Line	Data
8ab89567 SN	1	/*
8ab89567 SN	2	* Intel I/OAT DMA Linux driver
211a22ce	3	* Copyright(c) 2007 - 2009 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) },
7f1b358a MS	50
	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) },
8ab89567 SN	60	{ 0, }
	61	};
	62
	63	struct ioat_device {
	64	struct pci_dev *pdev;
	65	void __iomem *iobase;
	66	struct ioatdma_device *dma;
2ed6dc34	67	struct dca_provider *dca;
8ab89567 SN	68	};
	69
	70	static int __devinit ioat_probe(struct pci_dev *pdev,
	71	const struct pci_device_id *id);
8ab89567	72	static void __devexit ioat_remove(struct pci_dev *pdev);
8ab89567	73
2ed6dc34 SN	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)");
	77
7df7cf06	78	static struct pci_driver ioat_pci_driver = {
8ab89567 SN	79	.name = "ioatdma",
	80	.id_table = ioat_pci_tbl,
	81	.probe = ioat_probe,
8ab89567	82	.remove = __devexit_p(ioat_remove),
8ab89567 SN	83	};
	84
	85	static int __devinit ioat_probe(struct pci_dev *pdev,
	86	const struct pci_device_id *id)
	87	{
	88	void __iomem *iobase;
	89	struct ioat_device *device;
	90	unsigned long mmio_start, mmio_len;
	91	int err;
	92
	93	err = pci_enable_device(pdev);
	94	if (err)
	95	goto err_enable_device;
	96
7df7cf06	97	err = pci_request_regions(pdev, ioat_pci_driver.name);
8ab89567 SN	98	if (err)
	99	goto err_request_regions;
	100
6a35528a	101	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
8ab89567 SN	102	if (err)
	103	err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
	104	if (err)
	105	goto err_set_dma_mask;
	106
6a35528a	107	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
8ab89567 SN	108	if (err)
	109	err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
	110	if (err)
	111	goto err_set_dma_mask;
	112
	113	mmio_start = pci_resource_start(pdev, 0);
	114	mmio_len = pci_resource_len(pdev, 0);
	115	iobase = ioremap(mmio_start, mmio_len);
	116	if (!iobase) {
	117	err = -ENOMEM;
	118	goto err_ioremap;
	119	}
	120
	121	device = kzalloc(sizeof(*device), GFP_KERNEL);
	122	if (!device) {
	123	err = -ENOMEM;
	124	goto err_kzalloc;
	125	}
	126	device->pdev = pdev;
	127	pci_set_drvdata(pdev, device);
	128	device->iobase = iobase;
	129
	130	pci_set_master(pdev);
	131
4fac7fa5 DW	132	switch (readb(iobase + IOAT_VER_OFFSET)) {
	133	case IOAT_VER_1_2:
	134	device->dma = ioat_dma_probe(pdev, iobase);
	135	if (device->dma && ioat_dca_enabled)
	136	device->dca = ioat_dca_init(pdev, iobase);
	137	break;
	138	case IOAT_VER_2_0:
	139	device->dma = ioat_dma_probe(pdev, iobase);
	140	if (device->dma && ioat_dca_enabled)
	141	device->dca = ioat2_dca_init(pdev, iobase);
	142	break;
	143	case IOAT_VER_3_0:
	144	device->dma = ioat_dma_probe(pdev, iobase);
	145	if (device->dma && ioat_dca_enabled)
	146	device->dca = ioat3_dca_init(pdev, iobase);
	147	break;
	148	default:
	149	err = -ENODEV;
	150	break;
	151	}
	152	if (!device->dma)
	153	err = -ENODEV;
	154
8ab89567 SN	155	if (err)
	156	goto err_version;
	157
	158	return 0;
	159
	160	err_version:
	161	kfree(device);
	162	err_kzalloc:
	163	iounmap(iobase);
	164	err_ioremap:
	165	err_set_dma_mask:
	166	pci_release_regions(pdev);
	167	pci_disable_device(pdev);
	168	err_request_regions:
	169	err_enable_device:
	170	return err;
	171	}
	172
8ab89567 SN	173	static void __devexit ioat_remove(struct pci_dev *pdev)
	174	{
	175	struct ioat_device *device = pci_get_drvdata(pdev);
	176
4fac7fa5 DW	177	dev_err(&pdev->dev, "Removing dma and dca services\n");
	178	if (device->dca) {
	179	unregister_dca_provider(device->dca);
	180	free_dca_provider(device->dca);
	181	device->dca = NULL;
	182	}
	183
	184	if (device->dma) {
	185	ioat_dma_remove(device->dma);
	186	device->dma = NULL;
	187	}
8ab89567 SN	188
8ab89567 SN	189	kfree(device);
8ab89567	190	}
8ab89567 SN	191
	192	static int __init ioat_init_module(void)
	193	{
7df7cf06	194	return pci_register_driver(&ioat_pci_driver);
8ab89567 SN	195	}
	196	module_init(ioat_init_module);
	197
	198	static void __exit ioat_exit_module(void)
	199	{
7df7cf06	200	pci_unregister_driver(&ioat_pci_driver);
8ab89567 SN	201	}
8ab89567 SN	202	module_exit(ioat_exit_module);