[linux-2.6-block.git] / drivers / pci / pcie / portdrv_pci.c

/*
 * File:	portdrv_pci.c
 * Purpose:	PCI Express Port Bus Driver
 *
 * Copyright (C) 2004 Intel
 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/init.h>
#include <linux/pcieport_if.h>
#include <linux/aer.h>
#include <linux/dmi.h>
#include <linux/pci-aspm.h>

#include "portdrv.h"
#include "aer/aerdrv.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
#define DRIVER_DESC "PCIe Port Bus Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/* If this switch is set, PCIe port native services should not be enabled. */
bool pcie_ports_disabled;

/*
 * If this switch is set, ACPI _OSC will be used to determine whether or not to
 * enable PCIe port native services.
 */
bool pcie_ports_auto = true;

static int __init pcie_port_setup(char *str)
{
	if (!strncmp(str, "compat", 6)) {
		pcie_ports_disabled = true;
	} else if (!strncmp(str, "native", 6)) {
		pcie_ports_disabled = false;
		pcie_ports_auto = false;
	} else if (!strncmp(str, "auto", 4)) {
		pcie_ports_disabled = false;
		pcie_ports_auto = true;
	}

	return 1;
}
__setup("pcie_ports=", pcie_port_setup);

/* global data */

/**
 * pcie_clear_root_pme_status - Clear root port PME interrupt status.
 * @dev: PCIe root port or event collector.
 */
void pcie_clear_root_pme_status(struct pci_dev *dev)
{
	pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
}

static int pcie_portdrv_restore_config(struct pci_dev *dev)
{
	int retval;

	retval = pci_enable_device(dev);
	if (retval)
		return retval;
	pci_set_master(dev);
	return 0;
}

#ifdef CONFIG_PM
static int pcie_port_resume_noirq(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);

	/*
	 * Some BIOSes forget to clear Root PME Status bits after system wakeup
	 * which breaks ACPI-based runtime wakeup on PCI Express, so clear those
	 * bits now just in case (shouldn't hurt).
	 */
	if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
		pcie_clear_root_pme_status(pdev);
	return 0;
}

static const struct dev_pm_ops pcie_portdrv_pm_ops = {
	.suspend	= pcie_port_device_suspend,
	.resume		= pcie_port_device_resume,
	.freeze		= pcie_port_device_suspend,
	.thaw		= pcie_port_device_resume,
	.poweroff	= pcie_port_device_suspend,
	.restore	= pcie_port_device_resume,
	.resume_noirq	= pcie_port_resume_noirq,
};

#define PCIE_PORTDRV_PM_OPS	(&pcie_portdrv_pm_ops)

#else /* !PM */

#define PCIE_PORTDRV_PM_OPS	NULL
#endif /* !PM */

/*
 * pcie_portdrv_probe - Probe PCI-Express port devices
 * @dev: PCI-Express port device being probed
 *
 * If detected invokes the pcie_port_device_register() method for
 * this port device.
 *
 */
static int pcie_portdrv_probe(struct pci_dev *dev,
					const struct pci_device_id *id)
{
	int status;

	if (!pci_is_pcie(dev) ||
	    ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
	     (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
	     (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
		return -ENODEV;

	status = pcie_port_device_register(dev);
	if (status)
		return status;

	pci_save_state(dev);
	/*
	 * D3cold may not work properly on some PCIe port, so disable
	 * it by default.
	 */
	dev->d3cold_allowed = false;
	return 0;
}

static void pcie_portdrv_remove(struct pci_dev *dev)
{
	pcie_port_device_remove(dev);
}

static int error_detected_iter(struct device *device, void *data)
{
	struct pcie_device *pcie_device;
	struct pcie_port_service_driver *driver;
	struct aer_broadcast_data *result_data;
	pci_ers_result_t status;

	result_data = (struct aer_broadcast_data *) data;

	if (device->bus == &pcie_port_bus_type && device->driver) {
		driver = to_service_driver(device->driver);
		if (!driver ||
			!driver->err_handler ||
			!driver->err_handler->error_detected)
			return 0;

		pcie_device = to_pcie_device(device);

		/* Forward error detected message to service drivers */
		status = driver->err_handler->error_detected(
			pcie_device->port,
			result_data->state);
		result_data->result =
			merge_result(result_data->result, status);
	}

	return 0;
}

static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
					enum pci_channel_state error)
{
	struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};

	/* get true return value from &data */
	device_for_each_child(&dev->dev, &data, error_detected_iter);
	return data.result;
}

static int mmio_enabled_iter(struct device *device, void *data)
{
	struct pcie_device *pcie_device;
	struct pcie_port_service_driver *driver;
	pci_ers_result_t status, *result;

	result = (pci_ers_result_t *) data;

	if (device->bus == &pcie_port_bus_type && device->driver) {
		driver = to_service_driver(device->driver);
		if (driver &&
			driver->err_handler &&
			driver->err_handler->mmio_enabled) {
			pcie_device = to_pcie_device(device);

			/* Forward error message to service drivers */
			status = driver->err_handler->mmio_enabled(
					pcie_device->port);
			*result = merge_result(*result, status);
		}
	}

	return 0;
}

static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
{
	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;

	/* get true return value from &status */
	device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
	return status;
}

static int slot_reset_iter(struct device *device, void *data)
{
	struct pcie_device *pcie_device;
	struct pcie_port_service_driver *driver;
	pci_ers_result_t status, *result;

	result = (pci_ers_result_t *) data;

	if (device->bus == &pcie_port_bus_type && device->driver) {
		driver = to_service_driver(device->driver);
		if (driver &&
			driver->err_handler &&
			driver->err_handler->slot_reset) {
			pcie_device = to_pcie_device(device);

			/* Forward error message to service drivers */
			status = driver->err_handler->slot_reset(
					pcie_device->port);
			*result = merge_result(*result, status);
		}
	}

	return 0;
}

static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
{
	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;

	/* If fatal, restore cfg space for possible link reset at upstream */
	if (dev->error_state == pci_channel_io_frozen) {
		dev->state_saved = true;
		pci_restore_state(dev);
		pcie_portdrv_restore_config(dev);
		pci_enable_pcie_error_reporting(dev);
	}

	/* get true return value from &status */
	device_for_each_child(&dev->dev, &status, slot_reset_iter);
	return status;
}

static int resume_iter(struct device *device, void *data)
{
	struct pcie_device *pcie_device;
	struct pcie_port_service_driver *driver;

	if (device->bus == &pcie_port_bus_type && device->driver) {
		driver = to_service_driver(device->driver);
		if (driver &&
			driver->err_handler &&
			driver->err_handler->resume) {
			pcie_device = to_pcie_device(device);

			/* Forward error message to service drivers */
			driver->err_handler->resume(pcie_device->port);
		}
	}

	return 0;
}

static void pcie_portdrv_err_resume(struct pci_dev *dev)
{
	device_for_each_child(&dev->dev, NULL, resume_iter);
}

/*
 * LINUX Device Driver Model
 */
static const struct pci_device_id port_pci_ids[] = { {
	/* handle any PCI-Express port */
	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
	}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, port_pci_ids);

static const struct pci_error_handlers pcie_portdrv_err_handler = {
	.error_detected = pcie_portdrv_error_detected,
	.mmio_enabled = pcie_portdrv_mmio_enabled,
	.slot_reset = pcie_portdrv_slot_reset,
	.resume = pcie_portdrv_err_resume,
};

static struct pci_driver pcie_portdriver = {
	.name		= "pcieport",
	.id_table	= &port_pci_ids[0],

	.probe		= pcie_portdrv_probe,
	.remove		= pcie_portdrv_remove,

	.err_handler	= &pcie_portdrv_err_handler,

	.driver.pm	= PCIE_PORTDRV_PM_OPS,
};

static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
{
	pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
		  d->ident);
	pcie_pme_disable_msi();
	return 0;
}

static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
	/*
	 * Boxes that should not use MSI for PCIe PME signaling.
	 */
	{
	 .callback = dmi_pcie_pme_disable_msi,
	 .ident = "MSI Wind U-100",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR,
				"MICRO-STAR INTERNATIONAL CO., LTD"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
		     },
	 },
	 {}
};

static int __init pcie_portdrv_init(void)
{
	int retval;

	if (pcie_ports_disabled)
		return pci_register_driver(&pcie_portdriver);

	dmi_check_system(pcie_portdrv_dmi_table);

	retval = pcie_port_bus_register();
	if (retval) {
		printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
		goto out;
	}
	retval = pci_register_driver(&pcie_portdriver);
	if (retval)
		pcie_port_bus_unregister();
 out:
	return retval;
}

module_init(pcie_portdrv_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* File: portdrv_pci.c
	3	* Purpose: PCI Express Port Bus Driver
	4	*
	5	* Copyright (C) 2004 Intel
	6	* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/pci.h>
	11	#include <linux/kernel.h>
	12	#include <linux/errno.h>
	13	#include <linux/pm.h>
71a83bd7	14	#include <linux/pm_runtime.h>
1da177e4 LT	15	#include <linux/init.h>
1da177e4 LT	16	#include <linux/pcieport_if.h>
4bf3392e	17	#include <linux/aer.h>
c39fae14	18	#include <linux/dmi.h>
28eb5f27	19	#include <linux/pci-aspm.h>
1da177e4 LT	20
1da177e4 LT	21	#include "portdrv.h"
4bf3392e	22	#include "aer/aerdrv.h"
1da177e4 LT	23
	24	/*
	25	* Version Information
	26	*/
	27	#define DRIVER_VERSION "v1.0"
	28	#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
7e8af37a	29	#define DRIVER_DESC "PCIe Port Bus Driver"
1da177e4 LT	30	MODULE_AUTHOR(DRIVER_AUTHOR);
	31	MODULE_DESCRIPTION(DRIVER_DESC);
	32	MODULE_LICENSE("GPL");
	33
79dd9182 RW	34	/* If this switch is set, PCIe port native services should not be enabled. */
	35	bool pcie_ports_disabled;
	36
28eb5f27 RW	37	/*
	38	* If this switch is set, ACPI _OSC will be used to determine whether or not to
	39	* enable PCIe port native services.
	40	*/
	41	bool pcie_ports_auto = true;
	42
79dd9182 RW	43	static int __init pcie_port_setup(char *str)
79dd9182 RW	44	{
28eb5f27	45	if (!strncmp(str, "compat", 6)) {
79dd9182	46	pcie_ports_disabled = true;
28eb5f27 RW	47	} else if (!strncmp(str, "native", 6)) {
	48	pcie_ports_disabled = false;
	49	pcie_ports_auto = false;
	50	} else if (!strncmp(str, "auto", 4)) {
	51	pcie_ports_disabled = false;
	52	pcie_ports_auto = true;
	53	}
79dd9182 RW	54
	55	return 1;
	56	}
	57	__setup("pcie_ports=", pcie_port_setup);
	58
1da177e4	59	/* global data */
1da177e4	60
fe31e697 RW	61	/**
	62	* pcie_clear_root_pme_status - Clear root port PME interrupt status.
	63	* @dev: PCIe root port or event collector.
	64	*/
	65	void pcie_clear_root_pme_status(struct pci_dev *dev)
	66	{
2dcfaf85	67	pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
fe31e697 RW	68	}
fe31e697 RW	69
4bf3392e ZY	70	static int pcie_portdrv_restore_config(struct pci_dev *dev)
	71	{
	72	int retval;
	73
4bf3392e ZY	74	retval = pci_enable_device(dev);
	75	if (retval)
	76	return retval;
	77	pci_set_master(dev);
	78	return 0;
	79	}
	80
0bed208e	81	#ifdef CONFIG_PM
fe31e697 RW	82	static int pcie_port_resume_noirq(struct device *dev)
	83	{
	84	struct pci_dev *pdev = to_pci_dev(dev);
	85
	86	/*
	87	* Some BIOSes forget to clear Root PME Status bits after system wakeup
	88	* which breaks ACPI-based runtime wakeup on PCI Express, so clear those
	89	* bits now just in case (shouldn't hurt).
	90	*/
62f87c0e	91	if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
fe31e697 RW	92	pcie_clear_root_pme_status(pdev);
	93	return 0;
	94	}
	95
47145210	96	static const struct dev_pm_ops pcie_portdrv_pm_ops = {
3a3c244c RW	97	.suspend = pcie_port_device_suspend,
	98	.resume = pcie_port_device_resume,
	99	.freeze = pcie_port_device_suspend,
	100	.thaw = pcie_port_device_resume,
	101	.poweroff = pcie_port_device_suspend,
	102	.restore = pcie_port_device_resume,
fe31e697	103	.resume_noirq = pcie_port_resume_noirq,
3a3c244c	104	};
4bf3392e	105
3a3c244c	106	#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
a79d682f	107
3a3c244c RW	108	#else /* !PM */
	109
	110	#define PCIE_PORTDRV_PM_OPS NULL
	111	#endif /* !PM */
4bf3392e	112
1da177e4 LT	113	/*
	114	* pcie_portdrv_probe - Probe PCI-Express port devices
	115	* @dev: PCI-Express port device being probed
	116	*
40da4186	117	* If detected invokes the pcie_port_device_register() method for
1da177e4 LT	118	* this port device.
	119	*
	120	*/
15856ad5	121	static int pcie_portdrv_probe(struct pci_dev *dev,
898294c9	122	const struct pci_device_id *id)
1da177e4	123	{
898294c9	124	int status;
1da177e4	125
898294c9	126	if (!pci_is_pcie(dev) \|\|
62f87c0e YW	127	((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
	128	(pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
	129	(pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
898294c9	130	return -ENODEV;
1da177e4	131
f118c0c3 RW	132	status = pcie_port_device_register(dev);
	133	if (status)
	134	return status;
1da177e4	135
87d2e2ec	136	pci_save_state(dev);
4f9c1397 HY	137	/*
	138	* D3cold may not work properly on some PCIe port, so disable
	139	* it by default.
	140	*/
	141	dev->d3cold_allowed = false;
1da177e4 LT	142	return 0;
	143	}
	144
40da4186	145	static void pcie_portdrv_remove(struct pci_dev *dev)
1da177e4 LT	146	{
	147	pcie_port_device_remove(dev);
	148	}
	149
4bf3392e	150	static int error_detected_iter(struct device device, void data)
60854838	151	{
4bf3392e ZY	152	struct pcie_device *pcie_device;
	153	struct pcie_port_service_driver *driver;
	154	struct aer_broadcast_data *result_data;
	155	pci_ers_result_t status;
	156
	157	result_data = (struct aer_broadcast_data *) data;
	158
	159	if (device->bus == &pcie_port_bus_type && device->driver) {
	160	driver = to_service_driver(device->driver);
	161	if (!driver \|\|
	162	!driver->err_handler \|\|
	163	!driver->err_handler->error_detected)
	164	return 0;
	165
	166	pcie_device = to_pcie_device(device);
	167
	168	/* Forward error detected message to service drivers */
	169	status = driver->err_handler->error_detected(
	170	pcie_device->port,
	171	result_data->state);
	172	result_data->result =
	173	merge_result(result_data->result, status);
	174	}
	175
	176	return 0;
60854838 HK	177	}
60854838 HK	178
4bf3392e ZY	179	static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
4bf3392e ZY	180	enum pci_channel_state error)
60854838	181	{
40da4186	182	struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
4bf3392e	183
b638d7e7 BH	184	/* get true return value from &data */
b638d7e7 BH	185	device_for_each_child(&dev->dev, &data, error_detected_iter);
40da4186	186	return data.result;
4bf3392e ZY	187	}
	188
	189	static int mmio_enabled_iter(struct device device, void data)
	190	{
	191	struct pcie_device *pcie_device;
	192	struct pcie_port_service_driver *driver;
	193	pci_ers_result_t status, *result;
	194
	195	result = (pci_ers_result_t *) data;
	196
	197	if (device->bus == &pcie_port_bus_type && device->driver) {
	198	driver = to_service_driver(device->driver);
	199	if (driver &&
	200	driver->err_handler &&
	201	driver->err_handler->mmio_enabled) {
	202	pcie_device = to_pcie_device(device);
	203
	204	/* Forward error message to service drivers */
	205	status = driver->err_handler->mmio_enabled(
	206	pcie_device->port);
	207	result = merge_result(result, status);
	208	}
	209	}
60854838	210
60854838 HK	211	return 0;
	212	}
	213
4bf3392e	214	static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
1da177e4	215	{
4bf3392e	216	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
5823d100	217
b19441af	218	/* get true return value from &status */
b638d7e7	219	device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
4bf3392e	220	return status;
1da177e4 LT	221	}
1da177e4 LT	222
4bf3392e	223	static int slot_reset_iter(struct device device, void data)
1da177e4	224	{
4bf3392e ZY	225	struct pcie_device *pcie_device;
	226	struct pcie_port_service_driver *driver;
	227	pci_ers_result_t status, *result;
	228
	229	result = (pci_ers_result_t *) data;
	230
	231	if (device->bus == &pcie_port_bus_type && device->driver) {
	232	driver = to_service_driver(device->driver);
	233	if (driver &&
	234	driver->err_handler &&
	235	driver->err_handler->slot_reset) {
	236	pcie_device = to_pcie_device(device);
	237
	238	/* Forward error message to service drivers */
	239	status = driver->err_handler->slot_reset(
	240	pcie_device->port);
	241	result = merge_result(result, status);
	242	}
	243	}
	244
	245	return 0;
	246	}
	247
	248	static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
	249	{
029091df	250	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
4bf3392e ZY	251
	252	/* If fatal, restore cfg space for possible link reset at upstream */
	253	if (dev->error_state == pci_channel_io_frozen) {
e9d82888	254	dev->state_saved = true;
a79d682f	255	pci_restore_state(dev);
4bf3392e ZY	256	pcie_portdrv_restore_config(dev);
	257	pci_enable_pcie_error_reporting(dev);
	258	}
	259
b19441af	260	/* get true return value from &status */
b638d7e7	261	device_for_each_child(&dev->dev, &status, slot_reset_iter);
4bf3392e ZY	262	return status;
	263	}
	264
	265	static int resume_iter(struct device device, void data)
	266	{
	267	struct pcie_device *pcie_device;
	268	struct pcie_port_service_driver *driver;
	269
	270	if (device->bus == &pcie_port_bus_type && device->driver) {
	271	driver = to_service_driver(device->driver);
	272	if (driver &&
	273	driver->err_handler &&
	274	driver->err_handler->resume) {
	275	pcie_device = to_pcie_device(device);
	276
	277	/* Forward error message to service drivers */
	278	driver->err_handler->resume(pcie_device->port);
	279	}
	280	}
	281
	282	return 0;
	283	}
	284
	285	static void pcie_portdrv_err_resume(struct pci_dev *dev)
	286	{
b638d7e7	287	device_for_each_child(&dev->dev, NULL, resume_iter);
1da177e4	288	}
1da177e4 LT	289
	290	/*
	291	* LINUX Device Driver Model
	292	*/
	293	static const struct pci_device_id port_pci_ids[] = { {
	294	/* handle any PCI-Express port */
	295	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) \| 0x00), ~0),
	296	}, { /* end: all zeroes */ }
	297	};
	298	MODULE_DEVICE_TABLE(pci, port_pci_ids);
	299
49453028 SH	300	static const struct pci_error_handlers pcie_portdrv_err_handler = {
	301	.error_detected = pcie_portdrv_error_detected,
	302	.mmio_enabled = pcie_portdrv_mmio_enabled,
	303	.slot_reset = pcie_portdrv_slot_reset,
	304	.resume = pcie_portdrv_err_resume,
4bf3392e ZY	305	};
4bf3392e ZY	306
3603a6a3	307	static struct pci_driver pcie_portdriver = {
e3fb20f9	308	.name = "pcieport",
1da177e4 LT	309	.id_table = &port_pci_ids[0],
	310
	311	.probe = pcie_portdrv_probe,
	312	.remove = pcie_portdrv_remove,
	313
f7625980	314	.err_handler = &pcie_portdrv_err_handler,
3a3c244c	315
f7625980	316	.driver.pm = PCIE_PORTDRV_PM_OPS,
1da177e4 LT	317	};
1da177e4 LT	318
c39fae14 RW	319	static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
	320	{
	321	pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
227f0647	322	d->ident);
c39fae14 RW	323	pcie_pme_disable_msi();
	324	return 0;
	325	}
	326
	327	static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
	328	/*
	329	* Boxes that should not use MSI for PCIe PME signaling.
	330	*/
	331	{
	332	.callback = dmi_pcie_pme_disable_msi,
	333	.ident = "MSI Wind U-100",
	334	.matches = {
	335	DMI_MATCH(DMI_SYS_VENDOR,
f7625980	336	"MICRO-STAR INTERNATIONAL CO., LTD"),
c39fae14 RW	337	DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
	338	},
	339	},
	340	{}
	341	};
	342
1da177e4 LT	343	static int __init pcie_portdrv_init(void)
1da177e4 LT	344	{
20d51660	345	int retval;
1da177e4	346
fe31e697 RW	347	if (pcie_ports_disabled)
fe31e697 RW	348	return pci_register_driver(&pcie_portdriver);
79dd9182	349
c39fae14 RW	350	dmi_check_system(pcie_portdrv_dmi_table);
c39fae14 RW	351
20d51660 RD	352	retval = pcie_port_bus_register();
	353	if (retval) {
	354	printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
	355	goto out;
	356	}
3603a6a3	357	retval = pci_register_driver(&pcie_portdriver);
1da177e4 LT	358	if (retval)
1da177e4 LT	359	pcie_port_bus_unregister();
20d51660	360	out:
1da177e4 LT	361	return retval;
	362	}
	363
1da177e4	364	module_init(pcie_portdrv_init);