/* * File:	portdrv_core.c * Purpose:	PCI Express Port Bus Driver's Core Functions * * 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/pcieport_if.h>#include "portdrv.h"extern int pcie_mch_quirk;	/* MSI-quirk Indicator */static int pcie_port_probe_service(struct device *dev){	struct pcie_device *pciedev;	struct pcie_port_service_driver *driver;	int status = -ENODEV;	if (!dev || !dev->driver)		return status; 	driver = to_service_driver(dev->driver);	if (!driver || !driver->probe)		return status;	pciedev = to_pcie_device(dev);	status = driver->probe(pciedev, driver->id_table);	if (!status) {		printk(KERN_DEBUG "Load service driver %s on pcie device %s\n",			driver->name, dev->bus_id);		get_device(dev);	}	return status;}static int pcie_port_remove_service(struct device *dev){	struct pcie_device *pciedev;	struct pcie_port_service_driver *driver;	if (!dev || !dev->driver)		return 0;	pciedev = to_pcie_device(dev); 	driver = to_service_driver(dev->driver);	if (driver && driver->remove) { 		printk(KERN_DEBUG "Unload service driver %s on pcie device %s\n",			driver->name, dev->bus_id);		driver->remove(pciedev);		put_device(dev);	}	return 0;}static void pcie_port_shutdown_service(struct device *dev) {}static int pcie_port_suspend_service(struct device *dev, u32 state, u32 level){	struct pcie_device *pciedev;	struct pcie_port_service_driver *driver;	if (!dev || !dev->driver)		return 0;	pciedev = to_pcie_device(dev); 	driver = to_service_driver(dev->driver);	if (driver && driver->suspend)		driver->suspend(pciedev, state);	return 0;}static int pcie_port_resume_service(struct device *dev, u32 state){	struct pcie_device *pciedev;	struct pcie_port_service_driver *driver;	if (!dev || !dev->driver)		return 0;	pciedev = to_pcie_device(dev); 	driver = to_service_driver(dev->driver);	if (driver && driver->resume)		driver->resume(pciedev);	return 0;}/* * release_pcie_device *	 *	Being invoked automatically when device is being removed  *	in response to device_unregister(dev) call. *	Release all resources being claimed. */static void release_pcie_device(struct device *dev){	printk(KERN_DEBUG "Free Port Service[%s]\n", dev->bus_id);	kfree(to_pcie_device(dev));			}static int is_msi_quirked(struct pci_dev *dev){	int port_type, quirk = 0;	u16 reg16;	pci_read_config_word(dev, 		pci_find_capability(dev, PCI_CAP_ID_EXP) + 		PCIE_CAPABILITIES_REG, &reg16);	port_type = (reg16 >> 4) & PORT_TYPE_MASK;	switch(port_type) {	case PCIE_RC_PORT:		if (pcie_mch_quirk == 1)			quirk = 1;		break;	case PCIE_SW_UPSTREAM_PORT:	case PCIE_SW_DOWNSTREAM_PORT:	default:		break;		}	return quirk;}	static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask){	int i, pos, nvec, status = -EINVAL;	int interrupt_mode = PCIE_PORT_INTx_MODE;	/* Set INTx as default */	for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {		if (mask & (1 << i)) 			nvec++;		vectors[i] = dev->irq;	}		/* Check MSI quirk */	if (is_msi_quirked(dev))		return interrupt_mode;	/* Select MSI-X over MSI if supported */			pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);	if (pos) {		struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] = 			{{0, 0}, {0, 1}, {0, 2}, {0, 3}};		printk("%s Found MSIX capability\n", __FUNCTION__);		status = pci_enable_msix(dev, msix_entries, nvec);		if (!status) {			int j = 0;			interrupt_mode = PCIE_PORT_MSIX_MODE;			for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {				if (mask & (1 << i)) 					vectors[i] = msix_entries[j++].vector;			}		}	} 	if (status) {		pos = pci_find_capability(dev, PCI_CAP_ID_MSI);		if (pos) {			printk("%s Found MSI capability\n", __FUNCTION__);			status = pci_enable_msi(dev);			if (!status) {				interrupt_mode = PCIE_PORT_MSI_MODE;				for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)					vectors[i] = dev->irq;			}		}	} 	return interrupt_mode;}static int get_port_device_capability(struct pci_dev *dev){	int services = 0, pos;	u16 reg16;	u32 reg32;	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);	pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, &reg16);	/* Hot-Plug Capable */	if (reg16 & PORT_TO_SLOT_MASK) {		pci_read_config_dword(dev, 			pos + PCIE_SLOT_CAPABILITIES_REG, &reg32);		if (reg32 & SLOT_HP_CAPABLE_MASK)			services |= PCIE_PORT_SERVICE_HP;	} 	/* PME Capable */	pos = pci_find_capability(dev, PCI_CAP_ID_PME);	if (pos) 		services |= PCIE_PORT_SERVICE_PME;		pos = PCI_CFG_SPACE_SIZE;	while (pos) {		pci_read_config_dword(dev, pos, &reg32);		switch (reg32 & 0xffff) {		case PCI_EXT_CAP_ID_ERR:			services |= PCIE_PORT_SERVICE_AER;			pos = reg32 >> 20;			break;		case PCI_EXT_CAP_ID_VC:			services |= PCIE_PORT_SERVICE_VC;			pos = reg32 >> 20;			break;		default:			pos = 0;			break;		}	}	return services;}static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev, 	int port_type, int service_type, int irq, int irq_mode){	struct device *device;	dev->port = parent;	dev->interrupt_mode = irq_mode;	dev->irq = irq;	dev->id.vendor = parent->vendor;	dev->id.device = parent->device;	dev->id.port_type = port_type;	dev->id.service_type = (1 << service_type);	/* Initialize generic device interface */	device = &dev->device;	memset(device, 0, sizeof(struct device));	INIT_LIST_HEAD(&device->node);	INIT_LIST_HEAD(&device->children);	INIT_LIST_HEAD(&device->bus_list);	device->bus = &pcie_port_bus_type;	device->driver = NULL;	device->driver_data = NULL; 	device->release = release_pcie_device;	/* callback to free pcie dev */	sprintf(&device->bus_id[0], "pcie%02x", 		get_descriptor_id(port_type, service_type));	device->parent = &parent->dev;}static struct pcie_device* alloc_pcie_device(struct pci_dev *parent, 	int port_type, int service_type, int irq, int irq_mode){	struct pcie_device *device;	device = kmalloc(sizeof(struct pcie_device), GFP_KERNEL);	if (!device)		return NULL;	memset(device, 0, sizeof(struct pcie_device));	pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);	printk(KERN_DEBUG "Allocate Port Service[%s]\n", device->device.bus_id);	return device;}int pcie_port_device_probe(struct pci_dev *dev){	int pos, type;	u16 reg;	if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))		return -ENODEV;	pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, &reg);	type = (reg >> 4) & PORT_TYPE_MASK;	if (	type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||		type == PCIE_SW_DOWNSTREAM_PORT )  		return 0; 	return -ENODEV;}int pcie_port_device_register(struct pci_dev *dev){	int status, type, capabilities, irq_mode, i;	int vectors[PCIE_PORT_DEVICE_MAXSERVICES];	u16 reg16;	/* Get port type */	pci_read_config_word(dev, 		pci_find_capability(dev, PCI_CAP_ID_EXP) + 		PCIE_CAPABILITIES_REG, &reg16);	type = (reg16 >> 4) & PORT_TYPE_MASK;	/* Now get port services */	capabilities = get_port_device_capability(dev);	irq_mode = assign_interrupt_mode(dev, vectors, capabilities);	/* Allocate child services if any */	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {		struct pcie_device *child;		if (capabilities & (1 << i)) {			child = alloc_pcie_device(				dev, 		/* parent */				type,		/* port type */ 				i,		/* service type */				vectors[i],	/* irq */				irq_mode	/* interrupt mode */);			if (child) { 				status = device_register(&child->device);				if (status) {					kfree(child);					continue;				}				get_device(&child->device);			}		}	}	return 0;}#ifdef CONFIG_PMint pcie_port_device_suspend(struct pci_dev *dev, u32 state){	struct list_head 		*head, *tmp;	struct device 			*parent, *child;	struct device_driver 		*driver;	struct pcie_port_service_driver *service_driver;	parent = &dev->dev;	head = &parent->children;	tmp = head->next;	while (head != tmp) {		child = container_of(tmp, struct device, node);		tmp = tmp->next;		if (child->bus != &pcie_port_bus_type)			continue;		driver = child->driver;		if (!driver)			continue;		service_driver = to_service_driver(driver);		if (service_driver->suspend)  			service_driver->suspend(to_pcie_device(child), state);	}	return 0; }int pcie_port_device_resume(struct pci_dev *dev) { 	struct list_head 		*head, *tmp;	struct device 			*parent, *child;	struct device_driver 		*driver;	struct pcie_port_service_driver *service_driver;	parent = &dev->dev;	head = &parent->children;	tmp = head->next;	while (head != tmp) {		child = container_of(tmp, struct device, node);		tmp = tmp->next;		if (child->bus != &pcie_port_bus_type)			continue;		driver = child->driver;		if (!driver)			continue;		service_driver = to_service_driver(driver);		if (service_driver->resume)  			service_driver->resume(to_pcie_device(child));	}	return 0; }#endifvoid pcie_port_device_remove(struct pci_dev *dev){	struct list_head 		*head, *tmp;	struct device 			*parent, *child;	struct device_driver 		*driver;	struct pcie_port_service_driver *service_driver;	int interrupt_mode = PCIE_PORT_INTx_MODE;	parent = &dev->dev;	head = &parent->children;	tmp = head->next;	while (head != tmp) {		child = container_of(tmp, struct device, node);		tmp = tmp->next;		if (child->bus != &pcie_port_bus_type)			continue;		driver = child->driver;		if (driver) { 			service_driver = to_service_driver(driver);			if (service_driver->remove)  				service_driver->remove(to_pcie_device(child));		}		interrupt_mode = (to_pcie_device(child))->interrupt_mode;		put_device(child);		device_unregister(child);	}	/* Switch to INTx by default if MSI enabled */	if (interrupt_mode == PCIE_PORT_MSIX_MODE)		pci_disable_msix(dev);	else if (interrupt_mode == PCIE_PORT_MSI_MODE)		pci_disable_msi(dev);}void pcie_port_bus_register(void){	bus_register(&pcie_port_bus_type);}void pcie_port_bus_unregister(void){	bus_unregister(&pcie_port_bus_type);}int pcie_port_service_register(struct pcie_port_service_driver *new){	new->driver.name = (char *)new->name;	new->driver.bus = &pcie_port_bus_type;	new->driver.probe = pcie_port_probe_service;	new->driver.remove = pcie_port_remove_service;	new->driver.shutdown = pcie_port_shutdown_service;	new->driver.suspend = pcie_port_suspend_service;	new->driver.resume = pcie_port_resume_service;	return driver_register(&new->driver);} void pcie_port_service_unregister(struct pcie_port_service_driver *new){	driver_unregister(&new->driver);}EXPORT_SYMBOL(pcie_port_service_register);EXPORT_SYMBOL(pcie_port_service_unregister);