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 */
22 static int pcie_port_probe_service(struct device *dev)
24 struct pcie_device *pciedev;
25 struct pcie_port_service_driver *driver;
28 if (!dev || !dev->driver)
31 driver = to_service_driver(dev->driver);
32 if (!driver || !driver->probe)
35 pciedev = to_pcie_device(dev);
36 status = driver->probe(pciedev, driver->id_table);
38 dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
45 static int pcie_port_remove_service(struct device *dev)
47 struct pcie_device *pciedev;
48 struct pcie_port_service_driver *driver;
50 if (!dev || !dev->driver)
53 pciedev = to_pcie_device(dev);
54 driver = to_service_driver(dev->driver);
55 if (driver && driver->remove) {
56 dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n",
58 driver->remove(pciedev);
64 static void pcie_port_shutdown_service(struct device *dev) {}
66 static int pcie_port_suspend_service(struct device *dev, pm_message_t state)
68 struct pcie_device *pciedev;
69 struct pcie_port_service_driver *driver;
71 if (!dev || !dev->driver)
74 pciedev = to_pcie_device(dev);
75 driver = to_service_driver(dev->driver);
76 if (driver && driver->suspend)
77 driver->suspend(pciedev, state);
81 static int pcie_port_resume_service(struct device *dev)
83 struct pcie_device *pciedev;
84 struct pcie_port_service_driver *driver;
86 if (!dev || !dev->driver)
89 pciedev = to_pcie_device(dev);
90 driver = to_service_driver(dev->driver);
92 if (driver && driver->resume)
93 driver->resume(pciedev);
100 * Being invoked automatically when device is being removed
101 * in response to device_unregister(dev) call.
102 * Release all resources being claimed.
104 static void release_pcie_device(struct device *dev)
106 dev_printk(KERN_DEBUG, dev, "free port service\n");
107 kfree(to_pcie_device(dev));
110 static int is_msi_quirked(struct pci_dev *dev)
112 int port_type, quirk = 0;
115 pci_read_config_word(dev,
116 pci_find_capability(dev, PCI_CAP_ID_EXP) +
117 PCIE_CAPABILITIES_REG, ®16);
118 port_type = (reg16 >> 4) & PORT_TYPE_MASK;
121 if (pcie_mch_quirk == 1)
124 case PCIE_SW_UPSTREAM_PORT:
125 case PCIE_SW_DOWNSTREAM_PORT:
132 static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
134 int i, pos, nvec, status = -EINVAL;
135 int interrupt_mode = PCIE_PORT_INTx_MODE;
137 /* Set INTx as default */
138 for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
141 vectors[i] = dev->irq;
144 /* Check MSI quirk */
145 if (is_msi_quirked(dev))
146 return interrupt_mode;
148 /* Select MSI-X over MSI if supported */
149 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
151 struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
152 {{0, 0}, {0, 1}, {0, 2}, {0, 3}};
153 dev_info(&dev->dev, "found MSI-X capability\n");
154 status = pci_enable_msix(dev, msix_entries, nvec);
158 interrupt_mode = PCIE_PORT_MSIX_MODE;
159 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
161 vectors[i] = msix_entries[j++].vector;
166 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
168 dev_info(&dev->dev, "found MSI capability\n");
169 status = pci_enable_msi(dev);
171 interrupt_mode = PCIE_PORT_MSI_MODE;
172 for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
173 vectors[i] = dev->irq;
177 return interrupt_mode;
180 static int get_port_device_capability(struct pci_dev *dev)
182 int services = 0, pos;
186 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
187 pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
188 /* Hot-Plug Capable */
189 if (reg16 & PORT_TO_SLOT_MASK) {
190 pci_read_config_dword(dev,
191 pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
192 if (reg32 & SLOT_HP_CAPABLE_MASK)
193 services |= PCIE_PORT_SERVICE_HP;
195 /* PME Capable - root port capability */
196 if (((reg16 >> 4) & PORT_TYPE_MASK) == PCIE_RC_PORT)
197 services |= PCIE_PORT_SERVICE_PME;
199 pos = PCI_CFG_SPACE_SIZE;
201 pci_read_config_dword(dev, pos, ®32);
202 switch (reg32 & 0xffff) {
203 case PCI_EXT_CAP_ID_ERR:
204 services |= PCIE_PORT_SERVICE_AER;
207 case PCI_EXT_CAP_ID_VC:
208 services |= PCIE_PORT_SERVICE_VC;
220 static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
221 int port_type, int service_type, int irq, int irq_mode)
223 struct device *device;
226 dev->interrupt_mode = irq_mode;
228 dev->id.vendor = parent->vendor;
229 dev->id.device = parent->device;
230 dev->id.port_type = port_type;
231 dev->id.service_type = (1 << service_type);
233 /* Initialize generic device interface */
234 device = &dev->device;
235 memset(device, 0, sizeof(struct device));
236 device->bus = &pcie_port_bus_type;
237 device->driver = NULL;
238 device->driver_data = NULL;
239 device->release = release_pcie_device; /* callback to free pcie dev */
240 snprintf(device->bus_id, sizeof(device->bus_id), "%s:pcie%02x",
241 pci_name(parent), get_descriptor_id(port_type, service_type));
242 device->parent = &parent->dev;
245 static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
246 int port_type, int service_type, int irq, int irq_mode)
248 struct pcie_device *device;
250 device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
254 pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
255 dev_printk(KERN_DEBUG, &device->device, "allocate port service\n");
259 int pcie_port_device_probe(struct pci_dev *dev)
264 if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
267 pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®);
268 type = (reg >> 4) & PORT_TYPE_MASK;
269 if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
270 type == PCIE_SW_DOWNSTREAM_PORT )
276 int pcie_port_device_register(struct pci_dev *dev)
278 struct pcie_port_device_ext *p_ext;
279 int status, type, capabilities, irq_mode, i;
280 int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
283 /* Allocate port device extension */
284 if (!(p_ext = kmalloc(sizeof(struct pcie_port_device_ext), GFP_KERNEL)))
287 pci_set_drvdata(dev, p_ext);
290 pci_read_config_word(dev,
291 pci_find_capability(dev, PCI_CAP_ID_EXP) +
292 PCIE_CAPABILITIES_REG, ®16);
293 type = (reg16 >> 4) & PORT_TYPE_MASK;
295 /* Now get port services */
296 capabilities = get_port_device_capability(dev);
297 irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
298 p_ext->interrupt_mode = irq_mode;
300 /* Allocate child services if any */
301 for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
302 struct pcie_device *child;
304 if (capabilities & (1 << i)) {
305 child = alloc_pcie_device(
307 type, /* port type */
308 i, /* service type */
309 vectors[i], /* irq */
310 irq_mode /* interrupt mode */);
312 status = device_register(&child->device);
317 get_device(&child->device);
325 static int suspend_iter(struct device *dev, void *data)
327 struct pcie_port_service_driver *service_driver;
328 pm_message_t state = * (pm_message_t *) data;
330 if ((dev->bus == &pcie_port_bus_type) &&
332 service_driver = to_service_driver(dev->driver);
333 if (service_driver->suspend)
334 service_driver->suspend(to_pcie_device(dev), state);
339 int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
341 return device_for_each_child(&dev->dev, &state, suspend_iter);
344 static int resume_iter(struct device *dev, void *data)
346 struct pcie_port_service_driver *service_driver;
348 if ((dev->bus == &pcie_port_bus_type) &&
350 service_driver = to_service_driver(dev->driver);
351 if (service_driver->resume)
352 service_driver->resume(to_pcie_device(dev));
357 int pcie_port_device_resume(struct pci_dev *dev)
359 return device_for_each_child(&dev->dev, NULL, resume_iter);
363 static int remove_iter(struct device *dev, void *data)
365 struct pcie_port_service_driver *service_driver;
367 if (dev->bus == &pcie_port_bus_type) {
369 service_driver = to_service_driver(dev->driver);
370 if (service_driver->remove)
371 service_driver->remove(to_pcie_device(dev));
373 *(unsigned long*)data = (unsigned long)dev;
379 void pcie_port_device_remove(struct pci_dev *dev)
381 struct device *device;
382 unsigned long device_addr;
383 int interrupt_mode = PCIE_PORT_INTx_MODE;
387 status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
389 device = (struct device*)device_addr;
390 interrupt_mode = (to_pcie_device(device))->interrupt_mode;
392 device_unregister(device);
395 /* Switch to INTx by default if MSI enabled */
396 if (interrupt_mode == PCIE_PORT_MSIX_MODE)
397 pci_disable_msix(dev);
398 else if (interrupt_mode == PCIE_PORT_MSI_MODE)
399 pci_disable_msi(dev);
402 int pcie_port_bus_register(void)
404 return bus_register(&pcie_port_bus_type);
407 void pcie_port_bus_unregister(void)
409 bus_unregister(&pcie_port_bus_type);
412 int pcie_port_service_register(struct pcie_port_service_driver *new)
414 new->driver.name = (char *)new->name;
415 new->driver.bus = &pcie_port_bus_type;
416 new->driver.probe = pcie_port_probe_service;
417 new->driver.remove = pcie_port_remove_service;
418 new->driver.shutdown = pcie_port_shutdown_service;
419 new->driver.suspend = pcie_port_suspend_service;
420 new->driver.resume = pcie_port_resume_service;
422 return driver_register(&new->driver);
425 void pcie_port_service_unregister(struct pcie_port_service_driver *new)
427 driver_unregister(&new->driver);
430 EXPORT_SYMBOL(pcie_port_service_register);
431 EXPORT_SYMBOL(pcie_port_service_unregister);