[net-next-2.6.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/init.h>
#include <linux/slab.h>
#include <linux/pcieport_if.h>
#include <linux/aer.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");

/* global data */
static const char device_name[] = "pcieport-driver";

static int pcie_portdrv_save_config(struct pci_dev *dev)
{
	return pci_save_state(dev);
}

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

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

#ifdef CONFIG_PM
static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
{
	int ret = pcie_port_device_suspend(dev, state);

	if (!ret)
		ret = pcie_portdrv_save_config(dev);
	return ret;
}

static int pcie_portdrv_resume(struct pci_dev *dev)
{
	pcie_portdrv_restore_config(dev);
	return pcie_port_device_resume(dev);
}
#else
#define pcie_portdrv_suspend NULL
#define pcie_portdrv_resume NULL
#endif

/*
 * 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 __devinit pcie_portdrv_probe (struct pci_dev *dev, 
				const struct pci_device_id *id )
{
	int			status;

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

	if (pci_enable_device(dev) < 0) 
		return -ENODEV;
	
	pci_set_master(dev);
        if (!dev->irq && dev->pin) {
		printk(KERN_WARNING 
		"%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n", 
		__FUNCTION__, dev->vendor, dev->device);
	}
	if (pcie_port_device_register(dev)) {
		pci_disable_device(dev);
		return -ENOMEM;
	}

	pcie_portdrv_save_config(dev);

	pci_enable_pcie_error_reporting(dev);

	return 0;
}

static void pcie_portdrv_remove (struct pci_dev *dev)
{
	pcie_port_device_remove(dev);
	kfree(pci_get_drvdata(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 result_data =
			{error, PCI_ERS_RESULT_CAN_RECOVER};
	int retval;

	/* can not fail */
	retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);

	return result_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;
	int retval;

	/* get true return value from &status */
	retval = 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;
	int retval;

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

	/* get true return value from &status */
	retval = 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)
{
	int retval;
	/* nothing to do with error value, if it ever happens */
	retval = 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 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		= (char *)device_name,
	.id_table	= &port_pci_ids[0],

	.probe		= pcie_portdrv_probe,
	.remove		= pcie_portdrv_remove,

	.suspend	= pcie_portdrv_suspend,
	.resume		= pcie_portdrv_resume,

	.err_handler 	= &pcie_portdrv_err_handler,
};

static int __init pcie_portdrv_init(void)
{
	int retval;

	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;
}

static void __exit pcie_portdrv_exit(void) 
{
	pci_unregister_driver(&pcie_portdriver);
	pcie_port_bus_unregister();
}

module_init(pcie_portdrv_init);
module_exit(pcie_portdrv_exit);
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>
	14	#include <linux/init.h>
4e57b681	15	#include <linux/slab.h>
1da177e4	16	#include <linux/pcieport_if.h>
4bf3392e	17	#include <linux/aer.h>
1da177e4 LT	18
1da177e4 LT	19	#include "portdrv.h"
4bf3392e	20	#include "aer/aerdrv.h"
1da177e4 LT	21
	22	/*
	23	* Version Information
	24	*/
	25	#define DRIVER_VERSION "v1.0"
	26	#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
	27	#define DRIVER_DESC "PCIE Port Bus Driver"
	28	MODULE_AUTHOR(DRIVER_AUTHOR);
	29	MODULE_DESCRIPTION(DRIVER_DESC);
	30	MODULE_LICENSE("GPL");
	31
	32	/* global data */
	33	static const char device_name[] = "pcieport-driver";
	34
4bf3392e ZY	35	static int pcie_portdrv_save_config(struct pci_dev *dev)
	36	{
	37	return pci_save_state(dev);
	38	}
	39
4bf3392e ZY	40	static int pcie_portdrv_restore_config(struct pci_dev *dev)
	41	{
	42	int retval;
	43
	44	pci_restore_state(dev);
	45	retval = pci_enable_device(dev);
	46	if (retval)
	47	return retval;
	48	pci_set_master(dev);
	49	return 0;
	50	}
	51
0bed208e	52	#ifdef CONFIG_PM
4bf3392e ZY	53	static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
	54	{
	55	int ret = pcie_port_device_suspend(dev, state);
	56
	57	if (!ret)
	58	ret = pcie_portdrv_save_config(dev);
	59	return ret;
	60	}
	61
	62	static int pcie_portdrv_resume(struct pci_dev *dev)
	63	{
	64	pcie_portdrv_restore_config(dev);
	65	return pcie_port_device_resume(dev);
	66	}
	67	#else
	68	#define pcie_portdrv_suspend NULL
	69	#define pcie_portdrv_resume NULL
	70	#endif
	71
1da177e4 LT	72	/*
	73	* pcie_portdrv_probe - Probe PCI-Express port devices
	74	* @dev: PCI-Express port device being probed
	75	*
	76	* If detected invokes the pcie_port_device_register() method for
	77	* this port device.
	78	*
	79	*/
	80	static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
	81	const struct pci_device_id *id )
	82	{
	83	int status;
	84
	85	status = pcie_port_device_probe(dev);
	86	if (status)
	87	return status;
	88
	89	if (pci_enable_device(dev) < 0)
	90	return -ENODEV;
	91
	92	pci_set_master(dev);
83e42bcd	93	if (!dev->irq && dev->pin) {
1da177e4 LT	94	printk(KERN_WARNING
1da177e4 LT	95	"%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
bf5b4ba3	96	__FUNCTION__, dev->vendor, dev->device);
1da177e4	97	}
e4fd1f4a RD	98	if (pcie_port_device_register(dev)) {
e4fd1f4a RD	99	pci_disable_device(dev);
1da177e4	100	return -ENOMEM;
e4fd1f4a	101	}
1da177e4	102
4bf3392e ZY	103	pcie_portdrv_save_config(dev);
	104
	105	pci_enable_pcie_error_reporting(dev);
	106
1da177e4 LT	107	return 0;
	108	}
	109
	110	static void pcie_portdrv_remove (struct pci_dev *dev)
	111	{
	112	pcie_port_device_remove(dev);
5823d100	113	kfree(pci_get_drvdata(dev));
1da177e4 LT	114	}
1da177e4 LT	115
4bf3392e	116	static int error_detected_iter(struct device device, void data)
60854838	117	{
4bf3392e ZY	118	struct pcie_device *pcie_device;
	119	struct pcie_port_service_driver *driver;
	120	struct aer_broadcast_data *result_data;
	121	pci_ers_result_t status;
	122
	123	result_data = (struct aer_broadcast_data *) data;
	124
	125	if (device->bus == &pcie_port_bus_type && device->driver) {
	126	driver = to_service_driver(device->driver);
	127	if (!driver \|\|
	128	!driver->err_handler \|\|
	129	!driver->err_handler->error_detected)
	130	return 0;
	131
	132	pcie_device = to_pcie_device(device);
	133
	134	/* Forward error detected message to service drivers */
	135	status = driver->err_handler->error_detected(
	136	pcie_device->port,
	137	result_data->state);
	138	result_data->result =
	139	merge_result(result_data->result, status);
	140	}
	141
	142	return 0;
60854838 HK	143	}
60854838 HK	144
4bf3392e ZY	145	static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
4bf3392e ZY	146	enum pci_channel_state error)
60854838	147	{
4bf3392e ZY	148	struct aer_broadcast_data result_data =
4bf3392e ZY	149	{error, PCI_ERS_RESULT_CAN_RECOVER};
b19441af	150	int retval;
4bf3392e	151
b19441af GKH	152	/* can not fail */
b19441af GKH	153	retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
4bf3392e ZY	154
	155	return result_data.result;
	156	}
	157
	158	static int mmio_enabled_iter(struct device device, void data)
	159	{
	160	struct pcie_device *pcie_device;
	161	struct pcie_port_service_driver *driver;
	162	pci_ers_result_t status, *result;
	163
	164	result = (pci_ers_result_t *) data;
	165
	166	if (device->bus == &pcie_port_bus_type && device->driver) {
	167	driver = to_service_driver(device->driver);
	168	if (driver &&
	169	driver->err_handler &&
	170	driver->err_handler->mmio_enabled) {
	171	pcie_device = to_pcie_device(device);
	172
	173	/* Forward error message to service drivers */
	174	status = driver->err_handler->mmio_enabled(
	175	pcie_device->port);
	176	result = merge_result(result, status);
	177	}
	178	}
60854838	179
60854838 HK	180	return 0;
	181	}
	182
4bf3392e	183	static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
1da177e4	184	{
4bf3392e	185	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
b19441af	186	int retval;
5823d100	187
b19441af GKH	188	/* get true return value from &status */
b19441af GKH	189	retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
4bf3392e	190	return status;
1da177e4 LT	191	}
1da177e4 LT	192
4bf3392e	193	static int slot_reset_iter(struct device device, void data)
1da177e4	194	{
4bf3392e ZY	195	struct pcie_device *pcie_device;
	196	struct pcie_port_service_driver *driver;
	197	pci_ers_result_t status, *result;
	198
	199	result = (pci_ers_result_t *) data;
	200
	201	if (device->bus == &pcie_port_bus_type && device->driver) {
	202	driver = to_service_driver(device->driver);
	203	if (driver &&
	204	driver->err_handler &&
	205	driver->err_handler->slot_reset) {
	206	pcie_device = to_pcie_device(device);
	207
	208	/* Forward error message to service drivers */
	209	status = driver->err_handler->slot_reset(
	210	pcie_device->port);
	211	result = merge_result(result, status);
	212	}
	213	}
	214
	215	return 0;
	216	}
	217
	218	static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
	219	{
	220	pci_ers_result_t status;
b19441af	221	int retval;
4bf3392e ZY	222
	223	/* If fatal, restore cfg space for possible link reset at upstream */
	224	if (dev->error_state == pci_channel_io_frozen) {
	225	pcie_portdrv_restore_config(dev);
	226	pci_enable_pcie_error_reporting(dev);
	227	}
	228
b19441af GKH	229	/* get true return value from &status */
b19441af GKH	230	retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
4bf3392e ZY	231
	232	return status;
	233	}
	234
	235	static int resume_iter(struct device device, void data)
	236	{
	237	struct pcie_device *pcie_device;
	238	struct pcie_port_service_driver *driver;
	239
	240	if (device->bus == &pcie_port_bus_type && device->driver) {
	241	driver = to_service_driver(device->driver);
	242	if (driver &&
	243	driver->err_handler &&
	244	driver->err_handler->resume) {
	245	pcie_device = to_pcie_device(device);
	246
	247	/* Forward error message to service drivers */
	248	driver->err_handler->resume(pcie_device->port);
	249	}
	250	}
	251
	252	return 0;
	253	}
	254
	255	static void pcie_portdrv_err_resume(struct pci_dev *dev)
	256	{
b19441af GKH	257	int retval;
	258	/* nothing to do with error value, if it ever happens */
	259	retval = device_for_each_child(&dev->dev, NULL, resume_iter);
1da177e4	260	}
1da177e4 LT	261
	262	/*
	263	* LINUX Device Driver Model
	264	*/
	265	static const struct pci_device_id port_pci_ids[] = { {
	266	/* handle any PCI-Express port */
	267	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) \| 0x00), ~0),
	268	}, { /* end: all zeroes */ }
	269	};
	270	MODULE_DEVICE_TABLE(pci, port_pci_ids);
	271
4bf3392e ZY	272	static struct pci_error_handlers pcie_portdrv_err_handler = {
	273	.error_detected = pcie_portdrv_error_detected,
	274	.mmio_enabled = pcie_portdrv_mmio_enabled,
	275	.slot_reset = pcie_portdrv_slot_reset,
	276	.resume = pcie_portdrv_err_resume,
	277	};
	278
3603a6a3	279	static struct pci_driver pcie_portdriver = {
1da177e4 LT	280	.name = (char *)device_name,
	281	.id_table = &port_pci_ids[0],
	282
	283	.probe = pcie_portdrv_probe,
	284	.remove = pcie_portdrv_remove,
	285
1da177e4 LT	286	.suspend = pcie_portdrv_suspend,
1da177e4 LT	287	.resume = pcie_portdrv_resume,
4bf3392e ZY	288
4bf3392e ZY	289	.err_handler = &pcie_portdrv_err_handler,
1da177e4 LT	290	};
	291
	292	static int __init pcie_portdrv_init(void)
	293	{
20d51660	294	int retval;
1da177e4	295
20d51660 RD	296	retval = pcie_port_bus_register();
	297	if (retval) {
	298	printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
	299	goto out;
	300	}
3603a6a3	301	retval = pci_register_driver(&pcie_portdriver);
1da177e4 LT	302	if (retval)
1da177e4 LT	303	pcie_port_bus_unregister();
20d51660	304	out:
1da177e4 LT	305	return retval;
	306	}
	307
	308	static void __exit pcie_portdrv_exit(void)
	309	{
3603a6a3	310	pci_unregister_driver(&pcie_portdriver);
1da177e4 LT	311	pcie_port_bus_unregister();
	312	}
	313
	314	module_init(pcie_portdrv_init);
	315	module_exit(pcie_portdrv_exit);