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>
22 * release_pcie_device - free PCI Express port service device structure
23 * @dev: Port service device to release
25 * Invoked automatically when device is being removed in response to
26 * device_unregister(dev). Release all resources being claimed.
28 static void release_pcie_device(struct device *dev)
30 kfree(to_pcie_device(dev));
34 * assign_interrupt_mode - choose interrupt mode for PCI Express port services
35 * (INTx, MSI-X, MSI) and set up vectors
36 * @dev: PCI Express port to handle
37 * @vectors: Array of interrupt vectors to populate
38 * @mask: Bitmask of port capabilities returned by get_port_device_capability()
40 * Return value: Interrupt mode associated with the port
42 static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
44 struct pcie_port_data *port_data = pci_get_drvdata(dev);
45 int i, pos, nvec, status = -EINVAL;
46 int interrupt_mode = PCIE_PORT_INTx_MODE;
48 /* Set INTx as default */
49 for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
52 vectors[i] = dev->irq;
56 if (port_data->port_type == PCIE_RC_PORT && pcie_mch_quirk)
57 return interrupt_mode;
59 /* Select MSI-X over MSI if supported */
60 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
62 struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
63 {{0, 0}, {0, 1}, {0, 2}, {0, 3}};
64 status = pci_enable_msix(dev, msix_entries, nvec);
68 interrupt_mode = PCIE_PORT_MSIX_MODE;
69 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
71 vectors[i] = msix_entries[j++].vector;
76 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
78 status = pci_enable_msi(dev);
80 interrupt_mode = PCIE_PORT_MSI_MODE;
81 for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
82 vectors[i] = dev->irq;
86 return interrupt_mode;
90 * get_port_device_capability - discover capabilities of a PCI Express port
91 * @dev: PCI Express port to examine
93 * The capabilities are read from the port's PCI Express configuration registers
94 * as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and
97 * Return value: Bitmask of discovered port capabilities
99 static int get_port_device_capability(struct pci_dev *dev)
101 int services = 0, pos;
105 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
106 pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
107 /* Hot-Plug Capable */
108 if (reg16 & PORT_TO_SLOT_MASK) {
109 pci_read_config_dword(dev,
110 pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
111 if (reg32 & SLOT_HP_CAPABLE_MASK)
112 services |= PCIE_PORT_SERVICE_HP;
115 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
116 services |= PCIE_PORT_SERVICE_AER;
118 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
119 services |= PCIE_PORT_SERVICE_VC;
125 * pcie_device_init - initialize PCI Express port service device
126 * @dev: Port service device to initialize
127 * @parent: PCI Express port to associate the service device with
128 * @port_type: Type of the port
129 * @service_type: Type of service to associate with the service device
130 * @irq: Interrupt vector to associate with the service device
132 static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
133 int service_type, int irq)
135 struct pcie_port_data *port_data = pci_get_drvdata(parent);
136 struct device *device;
137 int port_type = port_data->port_type;
141 dev->id.vendor = parent->vendor;
142 dev->id.device = parent->device;
143 dev->id.port_type = port_type;
144 dev->id.service_type = (1 << service_type);
146 /* Initialize generic device interface */
147 device = &dev->device;
148 memset(device, 0, sizeof(struct device));
149 device->bus = &pcie_port_bus_type;
150 device->driver = NULL;
151 device->driver_data = NULL;
152 device->release = release_pcie_device; /* callback to free pcie dev */
153 dev_set_name(device, "%s:pcie%02x",
154 pci_name(parent), get_descriptor_id(port_type, service_type));
155 device->parent = &parent->dev;
159 * alloc_pcie_device - allocate PCI Express port service device structure
160 * @parent: PCI Express port to associate the service device with
161 * @port_type: Type of the port
162 * @service_type: Type of service to associate with the service device
163 * @irq: Interrupt vector to associate with the service device
165 static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
166 int service_type, int irq)
168 struct pcie_device *device;
170 device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
174 pcie_device_init(parent, device, service_type, irq);
179 * pcie_port_device_probe - check if device is a PCI Express port
180 * @dev: Device to check
182 int pcie_port_device_probe(struct pci_dev *dev)
187 if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
190 pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®);
191 type = (reg >> 4) & PORT_TYPE_MASK;
192 if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
193 type == PCIE_SW_DOWNSTREAM_PORT )
200 * pcie_port_device_register - register PCI Express port
201 * @dev: PCI Express port to register
203 * Allocate the port extension structure and register services associated with
206 int pcie_port_device_register(struct pci_dev *dev)
208 struct pcie_port_data *port_data;
209 int status, capabilities, irq_mode, i;
210 int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
213 port_data = kzalloc(sizeof(*port_data), GFP_KERNEL);
216 pci_set_drvdata(dev, port_data);
219 pci_read_config_word(dev,
220 pci_find_capability(dev, PCI_CAP_ID_EXP) +
221 PCIE_CAPABILITIES_REG, ®16);
222 port_data->port_type = (reg16 >> 4) & PORT_TYPE_MASK;
224 capabilities = get_port_device_capability(dev);
225 /* Root ports are capable of generating PME too */
226 if (port_data->port_type == PCIE_RC_PORT)
227 capabilities |= PCIE_PORT_SERVICE_PME;
229 irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
230 port_data->port_irq_mode = irq_mode;
232 /* Allocate child services if any */
233 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
234 struct pcie_device *child;
236 if (capabilities & (1 << i)) {
237 child = alloc_pcie_device(dev, i, vectors[i]);
239 status = device_register(&child->device);
244 get_device(&child->device);
252 static int suspend_iter(struct device *dev, void *data)
254 struct pcie_port_service_driver *service_driver;
255 pm_message_t state = * (pm_message_t *) data;
257 if ((dev->bus == &pcie_port_bus_type) &&
259 service_driver = to_service_driver(dev->driver);
260 if (service_driver->suspend)
261 service_driver->suspend(to_pcie_device(dev), state);
267 * pcie_port_device_suspend - suspend port services associated with a PCIe port
268 * @dev: PCI Express port to handle
269 * @state: Representation of system power management transition in progress
271 int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
273 return device_for_each_child(&dev->dev, &state, suspend_iter);
276 static int resume_iter(struct device *dev, void *data)
278 struct pcie_port_service_driver *service_driver;
280 if ((dev->bus == &pcie_port_bus_type) &&
282 service_driver = to_service_driver(dev->driver);
283 if (service_driver->resume)
284 service_driver->resume(to_pcie_device(dev));
290 * pcie_port_device_suspend - resume port services associated with a PCIe port
291 * @dev: PCI Express port to handle
293 int pcie_port_device_resume(struct pci_dev *dev)
295 return device_for_each_child(&dev->dev, NULL, resume_iter);
299 static int remove_iter(struct device *dev, void *data)
301 struct pcie_port_service_driver *service_driver;
303 if (dev->bus == &pcie_port_bus_type) {
305 service_driver = to_service_driver(dev->driver);
306 if (service_driver->remove)
307 service_driver->remove(to_pcie_device(dev));
309 *(unsigned long*)data = (unsigned long)dev;
316 * pcie_port_device_remove - unregister PCI Express port service devices
317 * @dev: PCI Express port the service devices to unregister are associated with
319 * Remove PCI Express port service devices associated with given port and
320 * disable MSI-X or MSI for the port.
322 void pcie_port_device_remove(struct pci_dev *dev)
324 struct pcie_port_data *port_data = pci_get_drvdata(dev);
328 unsigned long device_addr;
330 status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
332 struct device *device = (struct device*)device_addr;
334 device_unregister(device);
338 switch (port_data->port_irq_mode) {
339 case PCIE_PORT_MSIX_MODE:
340 pci_disable_msix(dev);
342 case PCIE_PORT_MSI_MODE:
343 pci_disable_msi(dev);
351 * pcie_port_probe_service - probe driver for given PCI Express port service
352 * @dev: PCI Express port service device to probe against
354 * If PCI Express port service driver is registered with
355 * pcie_port_service_register(), this function will be called by the driver core
356 * whenever match is found between the driver and a port service device.
358 static int pcie_port_probe_service(struct device *dev)
360 struct pcie_device *pciedev;
361 struct pcie_port_service_driver *driver;
364 if (!dev || !dev->driver)
367 driver = to_service_driver(dev->driver);
368 if (!driver || !driver->probe)
371 pciedev = to_pcie_device(dev);
372 status = driver->probe(pciedev, driver->id_table);
374 dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
382 * pcie_port_remove_service - detach driver from given PCI Express port service
383 * @dev: PCI Express port service device to handle
385 * If PCI Express port service driver is registered with
386 * pcie_port_service_register(), this function will be called by the driver core
387 * when device_unregister() is called for the port service device associated
390 static int pcie_port_remove_service(struct device *dev)
392 struct pcie_device *pciedev;
393 struct pcie_port_service_driver *driver;
395 if (!dev || !dev->driver)
398 pciedev = to_pcie_device(dev);
399 driver = to_service_driver(dev->driver);
400 if (driver && driver->remove) {
401 dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n",
403 driver->remove(pciedev);
410 * pcie_port_shutdown_service - shut down given PCI Express port service
411 * @dev: PCI Express port service device to handle
413 * If PCI Express port service driver is registered with
414 * pcie_port_service_register(), this function will be called by the driver core
415 * when device_shutdown() is called for the port service device associated
418 static void pcie_port_shutdown_service(struct device *dev) {}
421 * pcie_port_service_register - register PCI Express port service driver
422 * @new: PCI Express port service driver to register
424 int pcie_port_service_register(struct pcie_port_service_driver *new)
426 new->driver.name = (char *)new->name;
427 new->driver.bus = &pcie_port_bus_type;
428 new->driver.probe = pcie_port_probe_service;
429 new->driver.remove = pcie_port_remove_service;
430 new->driver.shutdown = pcie_port_shutdown_service;
432 return driver_register(&new->driver);
436 * pcie_port_service_unregister - unregister PCI Express port service driver
437 * @drv: PCI Express port service driver to unregister
439 void pcie_port_service_unregister(struct pcie_port_service_driver *drv)
441 driver_unregister(&drv->driver);
444 EXPORT_SYMBOL(pcie_port_service_register);
445 EXPORT_SYMBOL(pcie_port_service_unregister);