3 * Purpose: PCI Express Port Bus Driver's Core Functions
5 * Copyright (C) 2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/slab.h>
16 #include <linux/pcieport_if.h>
20 extern int pcie_mch_quirk; /* MSI-quirk Indicator */
23 * release_pcie_device - free PCI Express port service device structure
24 * @dev: Port service device to release
26 * Invoked automatically when device is being removed in response to
27 * device_unregister(dev). Release all resources being claimed.
29 static void release_pcie_device(struct device *dev)
31 kfree(to_pcie_device(dev));
34 static int is_msi_quirked(struct pci_dev *dev)
36 int port_type, quirk = 0;
39 pci_read_config_word(dev,
40 pci_find_capability(dev, PCI_CAP_ID_EXP) +
41 PCIE_CAPABILITIES_REG, ®16);
42 port_type = (reg16 >> 4) & PORT_TYPE_MASK;
45 if (pcie_mch_quirk == 1)
48 case PCIE_SW_UPSTREAM_PORT:
49 case PCIE_SW_DOWNSTREAM_PORT:
57 * assign_interrupt_mode - choose interrupt mode for PCI Express port services
58 * (INTx, MSI-X, MSI) and set up vectors
59 * @dev: PCI Express port to handle
60 * @vectors: Array of interrupt vectors to populate
61 * @mask: Bitmask of port capabilities returned by get_port_device_capability()
63 * Return value: Interrupt mode associated with the port
65 static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
67 int i, pos, nvec, status = -EINVAL;
68 int interrupt_mode = PCIE_PORT_INTx_MODE;
70 /* Set INTx as default */
71 for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
74 vectors[i] = dev->irq;
78 if (is_msi_quirked(dev))
79 return interrupt_mode;
81 /* Select MSI-X over MSI if supported */
82 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
84 struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
85 {{0, 0}, {0, 1}, {0, 2}, {0, 3}};
86 status = pci_enable_msix(dev, msix_entries, nvec);
90 interrupt_mode = PCIE_PORT_MSIX_MODE;
91 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
93 vectors[i] = msix_entries[j++].vector;
98 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
100 status = pci_enable_msi(dev);
102 interrupt_mode = PCIE_PORT_MSI_MODE;
103 for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
104 vectors[i] = dev->irq;
108 return interrupt_mode;
112 * get_port_device_capability - discover capabilities of a PCI Express port
113 * @dev: PCI Express port to examine
115 * The capabilities are read from the port's PCI Express configuration registers
116 * as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and
119 * Return value: Bitmask of discovered port capabilities
121 static int get_port_device_capability(struct pci_dev *dev)
123 int services = 0, pos;
127 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
128 pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
129 /* Hot-Plug Capable */
130 if (reg16 & PORT_TO_SLOT_MASK) {
131 pci_read_config_dword(dev,
132 pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
133 if (reg32 & SLOT_HP_CAPABLE_MASK)
134 services |= PCIE_PORT_SERVICE_HP;
136 /* PME Capable - root port capability */
137 if (((reg16 >> 4) & PORT_TYPE_MASK) == PCIE_RC_PORT)
138 services |= PCIE_PORT_SERVICE_PME;
140 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
141 services |= PCIE_PORT_SERVICE_AER;
142 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
143 services |= PCIE_PORT_SERVICE_VC;
149 * pcie_device_init - initialize PCI Express port service device
150 * @dev: Port service device to initialize
151 * @parent: PCI Express port to associate the service device with
152 * @port_type: Type of the port
153 * @service_type: Type of service to associate with the service device
154 * @irq: Interrupt vector to associate with the service device
155 * @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
157 static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
158 int port_type, int service_type, int irq, int irq_mode)
160 struct device *device;
163 dev->interrupt_mode = irq_mode;
165 dev->id.vendor = parent->vendor;
166 dev->id.device = parent->device;
167 dev->id.port_type = port_type;
168 dev->id.service_type = (1 << service_type);
170 /* Initialize generic device interface */
171 device = &dev->device;
172 memset(device, 0, sizeof(struct device));
173 device->bus = &pcie_port_bus_type;
174 device->driver = NULL;
175 device->driver_data = NULL;
176 device->release = release_pcie_device; /* callback to free pcie dev */
177 dev_set_name(device, "%s:pcie%02x",
178 pci_name(parent), get_descriptor_id(port_type, service_type));
179 device->parent = &parent->dev;
183 * alloc_pcie_device - allocate PCI Express port service device structure
184 * @parent: PCI Express port to associate the service device with
185 * @port_type: Type of the port
186 * @service_type: Type of service to associate with the service device
187 * @irq: Interrupt vector to associate with the service device
188 * @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
190 static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
191 int port_type, int service_type, int irq, int irq_mode)
193 struct pcie_device *device;
195 device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
199 pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
204 * pcie_port_device_probe - check if device is a PCI Express port
205 * @dev: Device to check
207 int pcie_port_device_probe(struct pci_dev *dev)
212 if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
215 pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®);
216 type = (reg >> 4) & PORT_TYPE_MASK;
217 if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
218 type == PCIE_SW_DOWNSTREAM_PORT )
225 * pcie_port_device_register - register PCI Express port
226 * @dev: PCI Express port to register
228 * Allocate the port extension structure and register services associated with
231 int pcie_port_device_register(struct pci_dev *dev)
233 struct pcie_port_device_ext *p_ext;
234 int status, type, capabilities, irq_mode, i;
235 int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
238 /* Allocate port device extension */
239 if (!(p_ext = kmalloc(sizeof(struct pcie_port_device_ext), GFP_KERNEL)))
242 pci_set_drvdata(dev, p_ext);
245 pci_read_config_word(dev,
246 pci_find_capability(dev, PCI_CAP_ID_EXP) +
247 PCIE_CAPABILITIES_REG, ®16);
248 type = (reg16 >> 4) & PORT_TYPE_MASK;
250 /* Now get port services */
251 capabilities = get_port_device_capability(dev);
252 irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
253 p_ext->interrupt_mode = irq_mode;
255 /* Allocate child services if any */
256 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
257 struct pcie_device *child;
259 if (capabilities & (1 << i)) {
260 child = alloc_pcie_device(
262 type, /* port type */
263 i, /* service type */
264 vectors[i], /* irq */
265 irq_mode /* interrupt mode */);
267 status = device_register(&child->device);
272 get_device(&child->device);
280 static int suspend_iter(struct device *dev, void *data)
282 struct pcie_port_service_driver *service_driver;
283 pm_message_t state = * (pm_message_t *) data;
285 if ((dev->bus == &pcie_port_bus_type) &&
287 service_driver = to_service_driver(dev->driver);
288 if (service_driver->suspend)
289 service_driver->suspend(to_pcie_device(dev), state);
295 * pcie_port_device_suspend - suspend port services associated with a PCIe port
296 * @dev: PCI Express port to handle
297 * @state: Representation of system power management transition in progress
299 int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
301 return device_for_each_child(&dev->dev, &state, suspend_iter);
304 static int resume_iter(struct device *dev, void *data)
306 struct pcie_port_service_driver *service_driver;
308 if ((dev->bus == &pcie_port_bus_type) &&
310 service_driver = to_service_driver(dev->driver);
311 if (service_driver->resume)
312 service_driver->resume(to_pcie_device(dev));
318 * pcie_port_device_suspend - resume port services associated with a PCIe port
319 * @dev: PCI Express port to handle
321 int pcie_port_device_resume(struct pci_dev *dev)
323 return device_for_each_child(&dev->dev, NULL, resume_iter);
327 static int remove_iter(struct device *dev, void *data)
329 struct pcie_port_service_driver *service_driver;
331 if (dev->bus == &pcie_port_bus_type) {
333 service_driver = to_service_driver(dev->driver);
334 if (service_driver->remove)
335 service_driver->remove(to_pcie_device(dev));
337 *(unsigned long*)data = (unsigned long)dev;
344 * pcie_port_device_remove - unregister PCI Express port service devices
345 * @dev: PCI Express port the service devices to unregister are associated with
347 * Remove PCI Express port service devices associated with given port and
348 * disable MSI-X or MSI for the port.
350 void pcie_port_device_remove(struct pci_dev *dev)
352 struct device *device;
353 unsigned long device_addr;
354 int interrupt_mode = PCIE_PORT_INTx_MODE;
358 status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
360 device = (struct device*)device_addr;
361 interrupt_mode = (to_pcie_device(device))->interrupt_mode;
363 device_unregister(device);
366 /* Switch to INTx by default if MSI enabled */
367 if (interrupt_mode == PCIE_PORT_MSIX_MODE)
368 pci_disable_msix(dev);
369 else if (interrupt_mode == PCIE_PORT_MSI_MODE)
370 pci_disable_msi(dev);
374 * pcie_port_probe_service - probe driver for given PCI Express port service
375 * @dev: PCI Express port service device to probe against
377 * If PCI Express port service driver is registered with
378 * pcie_port_service_register(), this function will be called by the driver core
379 * whenever match is found between the driver and a port service device.
381 static int pcie_port_probe_service(struct device *dev)
383 struct pcie_device *pciedev;
384 struct pcie_port_service_driver *driver;
387 if (!dev || !dev->driver)
390 driver = to_service_driver(dev->driver);
391 if (!driver || !driver->probe)
394 pciedev = to_pcie_device(dev);
395 status = driver->probe(pciedev, driver->id_table);
397 dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
405 * pcie_port_remove_service - detach driver from given PCI Express port service
406 * @dev: PCI Express port service device to handle
408 * If PCI Express port service driver is registered with
409 * pcie_port_service_register(), this function will be called by the driver core
410 * when device_unregister() is called for the port service device associated
413 static int pcie_port_remove_service(struct device *dev)
415 struct pcie_device *pciedev;
416 struct pcie_port_service_driver *driver;
418 if (!dev || !dev->driver)
421 pciedev = to_pcie_device(dev);
422 driver = to_service_driver(dev->driver);
423 if (driver && driver->remove) {
424 dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n",
426 driver->remove(pciedev);
433 * pcie_port_shutdown_service - shut down given PCI Express port service
434 * @dev: PCI Express port service device to handle
436 * If PCI Express port service driver is registered with
437 * pcie_port_service_register(), this function will be called by the driver core
438 * when device_shutdown() is called for the port service device associated
441 static void pcie_port_shutdown_service(struct device *dev) {}
444 * pcie_port_service_register - register PCI Express port service driver
445 * @new: PCI Express port service driver to register
447 int pcie_port_service_register(struct pcie_port_service_driver *new)
449 new->driver.name = (char *)new->name;
450 new->driver.bus = &pcie_port_bus_type;
451 new->driver.probe = pcie_port_probe_service;
452 new->driver.remove = pcie_port_remove_service;
453 new->driver.shutdown = pcie_port_shutdown_service;
455 return driver_register(&new->driver);
459 * pcie_port_service_unregister - unregister PCI Express port service driver
460 * @drv: PCI Express port service driver to unregister
462 void pcie_port_service_unregister(struct pcie_port_service_driver *drv)
464 driver_unregister(&drv->driver);
467 EXPORT_SYMBOL(pcie_port_service_register);
468 EXPORT_SYMBOL(pcie_port_service_unregister);