[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/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;

	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)
{
	return pcie_port_device_suspend(dev, state);

}

static int pcie_portdrv_suspend_late(struct pci_dev *dev, pm_message_t state)
{
	return pci_save_state(dev);
}

static int pcie_portdrv_resume_early(struct pci_dev *dev)
{
	return pci_restore_state(dev);
}

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_suspend_late NULL
#define pcie_portdrv_resume_early 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) {
		dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
			 "check vendor BIOS\n", 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 = PCI_ERS_RESULT_NONE;
	int retval;

	/* If fatal, restore cfg space for possible link reset at upstream */
	if (dev->error_state == pci_channel_io_frozen) {
		pci_restore_state(dev);
		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,
	.suspend_late	= pcie_portdrv_suspend_late,
	.resume_early	= pcie_portdrv_resume_early,
	.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
4bf3392e ZY	44	retval = pci_enable_device(dev);
	45	if (retval)
	46	return retval;
	47	pci_set_master(dev);
	48	return 0;
	49	}
	50
0bed208e	51	#ifdef CONFIG_PM
a79d682f	52	static int pcie_portdrv_suspend(struct pci_dev *dev, pm_message_t state)
4bf3392e	53	{
a79d682f	54	return pcie_port_device_suspend(dev, state);
4bf3392e	55
a79d682f RW	56	}
	57
	58	static int pcie_portdrv_suspend_late(struct pci_dev *dev, pm_message_t state)
	59	{
	60	return pci_save_state(dev);
4bf3392e ZY	61	}
4bf3392e ZY	62
90d25f24	63	static int pcie_portdrv_resume_early(struct pci_dev *dev)
a79d682f RW	64	{
	65	return pci_restore_state(dev);
	66	}
	67
	68	static int pcie_portdrv_resume(struct pci_dev *dev)
4bf3392e ZY	69	{
	70	pcie_portdrv_restore_config(dev);
	71	return pcie_port_device_resume(dev);
	72	}
	73	#else
a79d682f	74	#define pcie_portdrv_suspend NULL
90d25f24 RW	75	#define pcie_portdrv_suspend_late NULL
90d25f24 RW	76	#define pcie_portdrv_resume_early NULL
a79d682f	77	#define pcie_portdrv_resume NULL
4bf3392e ZY	78	#endif
4bf3392e ZY	79
1da177e4 LT	80	/*
	81	* pcie_portdrv_probe - Probe PCI-Express port devices
	82	* @dev: PCI-Express port device being probed
	83	*
	84	* If detected invokes the pcie_port_device_register() method for
	85	* this port device.
	86	*
	87	*/
	88	static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
	89	const struct pci_device_id *id )
	90	{
	91	int status;
	92
	93	status = pcie_port_device_probe(dev);
	94	if (status)
	95	return status;
	96
	97	if (pci_enable_device(dev) < 0)
	98	return -ENODEV;
	99
	100	pci_set_master(dev);
83e42bcd	101	if (!dev->irq && dev->pin) {
34a2e15e	102	dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
34438ba6	103	"check vendor BIOS\n", dev->vendor, dev->device);
1da177e4	104	}
e4fd1f4a RD	105	if (pcie_port_device_register(dev)) {
e4fd1f4a RD	106	pci_disable_device(dev);
1da177e4	107	return -ENOMEM;
e4fd1f4a	108	}
1da177e4	109
4bf3392e ZY	110	pcie_portdrv_save_config(dev);
	111
	112	pci_enable_pcie_error_reporting(dev);
	113
1da177e4 LT	114	return 0;
	115	}
	116
	117	static void pcie_portdrv_remove (struct pci_dev *dev)
	118	{
	119	pcie_port_device_remove(dev);
5823d100	120	kfree(pci_get_drvdata(dev));
1da177e4 LT	121	}
1da177e4 LT	122
4bf3392e	123	static int error_detected_iter(struct device device, void data)
60854838	124	{
4bf3392e ZY	125	struct pcie_device *pcie_device;
	126	struct pcie_port_service_driver *driver;
	127	struct aer_broadcast_data *result_data;
	128	pci_ers_result_t status;
	129
	130	result_data = (struct aer_broadcast_data *) data;
	131
	132	if (device->bus == &pcie_port_bus_type && device->driver) {
	133	driver = to_service_driver(device->driver);
	134	if (!driver \|\|
	135	!driver->err_handler \|\|
	136	!driver->err_handler->error_detected)
	137	return 0;
	138
	139	pcie_device = to_pcie_device(device);
	140
	141	/* Forward error detected message to service drivers */
	142	status = driver->err_handler->error_detected(
	143	pcie_device->port,
	144	result_data->state);
	145	result_data->result =
	146	merge_result(result_data->result, status);
	147	}
	148
	149	return 0;
60854838 HK	150	}
60854838 HK	151
4bf3392e ZY	152	static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
4bf3392e ZY	153	enum pci_channel_state error)
60854838	154	{
4bf3392e ZY	155	struct aer_broadcast_data result_data =
4bf3392e ZY	156	{error, PCI_ERS_RESULT_CAN_RECOVER};
b19441af	157	int retval;
4bf3392e	158
b19441af GKH	159	/* can not fail */
b19441af GKH	160	retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
4bf3392e ZY	161
	162	return result_data.result;
	163	}
	164
	165	static int mmio_enabled_iter(struct device device, void data)
	166	{
	167	struct pcie_device *pcie_device;
	168	struct pcie_port_service_driver *driver;
	169	pci_ers_result_t status, *result;
	170
	171	result = (pci_ers_result_t *) data;
	172
	173	if (device->bus == &pcie_port_bus_type && device->driver) {
	174	driver = to_service_driver(device->driver);
	175	if (driver &&
	176	driver->err_handler &&
	177	driver->err_handler->mmio_enabled) {
	178	pcie_device = to_pcie_device(device);
	179
	180	/* Forward error message to service drivers */
	181	status = driver->err_handler->mmio_enabled(
	182	pcie_device->port);
	183	result = merge_result(result, status);
	184	}
	185	}
60854838	186
60854838 HK	187	return 0;
	188	}
	189
4bf3392e	190	static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
1da177e4	191	{
4bf3392e	192	pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
b19441af	193	int retval;
5823d100	194
b19441af GKH	195	/* get true return value from &status */
b19441af GKH	196	retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
4bf3392e	197	return status;
1da177e4 LT	198	}
1da177e4 LT	199
4bf3392e	200	static int slot_reset_iter(struct device device, void data)
1da177e4	201	{
4bf3392e ZY	202	struct pcie_device *pcie_device;
	203	struct pcie_port_service_driver *driver;
	204	pci_ers_result_t status, *result;
	205
	206	result = (pci_ers_result_t *) data;
	207
	208	if (device->bus == &pcie_port_bus_type && device->driver) {
	209	driver = to_service_driver(device->driver);
	210	if (driver &&
	211	driver->err_handler &&
	212	driver->err_handler->slot_reset) {
	213	pcie_device = to_pcie_device(device);
	214
	215	/* Forward error message to service drivers */
	216	status = driver->err_handler->slot_reset(
	217	pcie_device->port);
	218	result = merge_result(result, status);
	219	}
	220	}
	221
	222	return 0;
	223	}
	224
	225	static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
	226	{
bf164410	227	pci_ers_result_t status = PCI_ERS_RESULT_NONE;
b19441af	228	int retval;
4bf3392e ZY	229
	230	/* If fatal, restore cfg space for possible link reset at upstream */
	231	if (dev->error_state == pci_channel_io_frozen) {
a79d682f	232	pci_restore_state(dev);
4bf3392e ZY	233	pcie_portdrv_restore_config(dev);
	234	pci_enable_pcie_error_reporting(dev);
	235	}
	236
b19441af GKH	237	/* get true return value from &status */
b19441af GKH	238	retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
4bf3392e ZY	239
	240	return status;
	241	}
	242
	243	static int resume_iter(struct device device, void data)
	244	{
	245	struct pcie_device *pcie_device;
	246	struct pcie_port_service_driver *driver;
	247
	248	if (device->bus == &pcie_port_bus_type && device->driver) {
	249	driver = to_service_driver(device->driver);
	250	if (driver &&
	251	driver->err_handler &&
	252	driver->err_handler->resume) {
	253	pcie_device = to_pcie_device(device);
	254
	255	/* Forward error message to service drivers */
	256	driver->err_handler->resume(pcie_device->port);
	257	}
	258	}
	259
	260	return 0;
	261	}
	262
	263	static void pcie_portdrv_err_resume(struct pci_dev *dev)
	264	{
b19441af GKH	265	int retval;
	266	/* nothing to do with error value, if it ever happens */
	267	retval = device_for_each_child(&dev->dev, NULL, resume_iter);
1da177e4	268	}
1da177e4 LT	269
	270	/*
	271	* LINUX Device Driver Model
	272	*/
	273	static const struct pci_device_id port_pci_ids[] = { {
	274	/* handle any PCI-Express port */
	275	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) \| 0x00), ~0),
	276	}, { /* end: all zeroes */ }
	277	};
	278	MODULE_DEVICE_TABLE(pci, port_pci_ids);
	279
4bf3392e ZY	280	static struct pci_error_handlers pcie_portdrv_err_handler = {
	281	.error_detected = pcie_portdrv_error_detected,
	282	.mmio_enabled = pcie_portdrv_mmio_enabled,
	283	.slot_reset = pcie_portdrv_slot_reset,
	284	.resume = pcie_portdrv_err_resume,
	285	};
	286
3603a6a3	287	static struct pci_driver pcie_portdriver = {
1da177e4 LT	288	.name = (char *)device_name,
	289	.id_table = &port_pci_ids[0],
	290
	291	.probe = pcie_portdrv_probe,
	292	.remove = pcie_portdrv_remove,
	293
a79d682f	294	.suspend = pcie_portdrv_suspend,
90d25f24 RW	295	.suspend_late = pcie_portdrv_suspend_late,
90d25f24 RW	296	.resume_early = pcie_portdrv_resume_early,
a79d682f	297	.resume = pcie_portdrv_resume,
4bf3392e ZY	298
4bf3392e ZY	299	.err_handler = &pcie_portdrv_err_handler,
1da177e4 LT	300	};
	301
	302	static int __init pcie_portdrv_init(void)
	303	{
20d51660	304	int retval;
1da177e4	305
20d51660 RD	306	retval = pcie_port_bus_register();
	307	if (retval) {
	308	printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
	309	goto out;
	310	}
3603a6a3	311	retval = pci_register_driver(&pcie_portdriver);
1da177e4 LT	312	if (retval)
1da177e4 LT	313	pcie_port_bus_unregister();
20d51660	314	out:
1da177e4 LT	315	return retval;
	316	}
	317
	318	static void __exit pcie_portdrv_exit(void)
	319	{
3603a6a3	320	pci_unregister_driver(&pcie_portdriver);
1da177e4 LT	321	pcie_port_bus_unregister();
	322	}
	323
	324	module_init(pcie_portdrv_init);
	325	module_exit(pcie_portdrv_exit);