drivers/pci/pcie/portdrv_core.c

   1 /*
   2  * File:        portdrv_core.c
   3  * Purpose:     PCI Express Port Bus Driver's Core Functions
   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/string.h>
  15 #include <linux/slab.h>
  16 #include <linux/pcieport_if.h>
  17
  18 #include "portdrv.h"
  19
  20 extern int pcie_mch_quirk;      /* MSI-quirk Indicator */
  21
  22 static int pcie_port_probe_service(struct device *dev)
  23 {
  24         struct pcie_device *pciedev;
  25         struct pcie_port_service_driver *driver;
  26         int status;
  27
  28         if (!dev || !dev->driver)
  29                 return -ENODEV;
  30
  31         driver = to_service_driver(dev->driver);
  32         if (!driver || !driver->probe)
  33                 return -ENODEV;
  34
  35         pciedev = to_pcie_device(dev);
  36         status = driver->probe(pciedev, driver->id_table);
  37         if (!status) {
  38                 dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
  39                         driver->name);
  40                 get_device(dev);
  41         }
  42         return status;
  43 }
  44
  45 static int pcie_port_remove_service(struct device *dev)
  46 {
  47         struct pcie_device *pciedev;
  48         struct pcie_port_service_driver *driver;
  49
  50         if (!dev || !dev->driver)
  51                 return 0;
  52
  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",
  57                         driver->name);
  58                 driver->remove(pciedev);
  59                 put_device(dev);
  60         }
  61         return 0;
  62 }
  63
  64 static void pcie_port_shutdown_service(struct device *dev) {}
  65
  66 static int pcie_port_suspend_service(struct device *dev, pm_message_t state)
  67 {
  68         struct pcie_device *pciedev;
  69         struct pcie_port_service_driver *driver;
  70
  71         if (!dev || !dev->driver)
  72                 return 0;
  73
  74         pciedev = to_pcie_device(dev);
  75         driver = to_service_driver(dev->driver);
  76         if (driver && driver->suspend)
  77                 driver->suspend(pciedev, state);
  78         return 0;
  79 }
  80
  81 static int pcie_port_resume_service(struct device *dev)
  82 {
  83         struct pcie_device *pciedev;
  84         struct pcie_port_service_driver *driver;
  85
  86         if (!dev || !dev->driver)
  87                 return 0;
  88
  89         pciedev = to_pcie_device(dev);
  90         driver = to_service_driver(dev->driver);
  91
  92         if (driver && driver->resume)
  93                 driver->resume(pciedev);
  94         return 0;
  95 }
  96
  97 /*
  98  * release_pcie_device
  99  *
 100  *      Being invoked automatically when device is being removed
 101  *      in response to device_unregister(dev) call.
 102  *      Release all resources being claimed.
 103  */
 104 static void release_pcie_device(struct device *dev)
 105 {
 106         dev_printk(KERN_DEBUG, dev, "free port service\n");
 107         kfree(to_pcie_device(dev));
 108 }
 109
 110 static int is_msi_quirked(struct pci_dev *dev)
 111 {
 112         int port_type, quirk = 0;
 113         u16 reg16;
 114
 115         pci_read_config_word(dev,
 116                 pci_find_capability(dev, PCI_CAP_ID_EXP) +
 117                 PCIE_CAPABILITIES_REG, &reg16);
 118         port_type = (reg16 >> 4) & PORT_TYPE_MASK;
 119         switch(port_type) {
 120         case PCIE_RC_PORT:
 121                 if (pcie_mch_quirk == 1)
 122                         quirk = 1;
 123                 break;
 124         case PCIE_SW_UPSTREAM_PORT:
 125         case PCIE_SW_DOWNSTREAM_PORT:
 126         default:
 127                 break;
 128         }
 129         return quirk;
 130 }
 131
 132 static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
 133 {
 134         int i, pos, nvec, status = -EINVAL;
 135         int interrupt_mode = PCIE_PORT_INTx_MODE;
 136
 137         /* Set INTx as default */
 138         for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 139                 if (mask & (1 << i))
 140                         nvec++;
 141                 vectors[i] = dev->irq;
 142         }
 143
 144         /* Check MSI quirk */
 145         if (is_msi_quirked(dev))
 146                 return interrupt_mode;
 147
 148         /* Select MSI-X over MSI if supported */
 149         pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
 150         if (pos) {
 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);
 155                 if (!status) {
 156                         int j = 0;
 157
 158                         interrupt_mode = PCIE_PORT_MSIX_MODE;
 159                         for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 160                                 if (mask & (1 << i))
 161                                         vectors[i] = msix_entries[j++].vector;
 162                         }
 163                 }
 164         }
 165         if (status) {
 166                 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
 167                 if (pos) {
 168                         dev_info(&dev->dev, "found MSI capability\n");
 169                         status = pci_enable_msi(dev);
 170                         if (!status) {
 171                                 interrupt_mode = PCIE_PORT_MSI_MODE;
 172                                 for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
 173                                         vectors[i] = dev->irq;
 174                         }
 175                 }
 176         }
 177         return interrupt_mode;
 178 }
 179
 180 static int get_port_device_capability(struct pci_dev *dev)
 181 {
 182         int services = 0, pos;
 183         u16 reg16;
 184         u32 reg32;
 185
 186         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
 187         pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, &reg16);
 188         /* Hot-Plug Capable */
 189         if (reg16 & PORT_TO_SLOT_MASK) {
 190                 pci_read_config_dword(dev,
 191                         pos + PCIE_SLOT_CAPABILITIES_REG, &reg32);
 192                 if (reg32 & SLOT_HP_CAPABLE_MASK)
 193                         services |= PCIE_PORT_SERVICE_HP;
 194         }
 195         /* PME Capable - root port capability */
 196         if (((reg16 >> 4) & PORT_TYPE_MASK) == PCIE_RC_PORT)
 197                 services |= PCIE_PORT_SERVICE_PME;
 198
 199         if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
 200                 services |= PCIE_PORT_SERVICE_AER;
 201         if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
 202                 services |= PCIE_PORT_SERVICE_VC;
 203
 204         return services;
 205 }
 206
 207 static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
 208         int port_type, int service_type, int irq, int irq_mode)
 209 {
 210         struct device *device;
 211
 212         dev->port = parent;
 213         dev->interrupt_mode = irq_mode;
 214         dev->irq = irq;
 215         dev->id.vendor = parent->vendor;
 216         dev->id.device = parent->device;
 217         dev->id.port_type = port_type;
 218         dev->id.service_type = (1 << service_type);
 219
 220         /* Initialize generic device interface */
 221         device = &dev->device;
 222         memset(device, 0, sizeof(struct device));
 223         device->bus = &pcie_port_bus_type;
 224         device->driver = NULL;
 225         device->driver_data = NULL;
 226         device->release = release_pcie_device;  /* callback to free pcie dev */
 227         snprintf(device->bus_id, sizeof(device->bus_id), "%s:pcie%02x",
 228                  pci_name(parent), get_descriptor_id(port_type, service_type));
 229         device->parent = &parent->dev;
 230 }
 231
 232 static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
 233         int port_type, int service_type, int irq, int irq_mode)
 234 {
 235         struct pcie_device *device;
 236
 237         device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
 238         if (!device)
 239                 return NULL;
 240
 241         pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
 242         dev_printk(KERN_DEBUG, &device->device, "allocate port service\n");
 243         return device;
 244 }
 245
 246 int pcie_port_device_probe(struct pci_dev *dev)
 247 {
 248         int pos, type;
 249         u16 reg;
 250
 251         if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
 252                 return -ENODEV;
 253
 254         pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, &reg);
 255         type = (reg >> 4) & PORT_TYPE_MASK;
 256         if (    type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
 257                 type == PCIE_SW_DOWNSTREAM_PORT )
 258                 return 0;
 259
 260         return -ENODEV;
 261 }
 262
 263 int pcie_port_device_register(struct pci_dev *dev)
 264 {
 265         struct pcie_port_device_ext *p_ext;
 266         int status, type, capabilities, irq_mode, i;
 267         int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
 268         u16 reg16;
 269
 270         /* Allocate port device extension */
 271         if (!(p_ext = kmalloc(sizeof(struct pcie_port_device_ext), GFP_KERNEL)))
 272                 return -ENOMEM;
 273
 274         pci_set_drvdata(dev, p_ext);
 275
 276         /* Get port type */
 277         pci_read_config_word(dev,
 278                 pci_find_capability(dev, PCI_CAP_ID_EXP) +
 279                 PCIE_CAPABILITIES_REG, &reg16);
 280         type = (reg16 >> 4) & PORT_TYPE_MASK;
 281
 282         /* Now get port services */
 283         capabilities = get_port_device_capability(dev);
 284         irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
 285         p_ext->interrupt_mode = irq_mode;
 286
 287         /* Allocate child services if any */
 288         for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 289                 struct pcie_device *child;
 290
 291                 if (capabilities & (1 << i)) {
 292                         child = alloc_pcie_device(
 293                                 dev,            /* parent */
 294                                 type,           /* port type */
 295                                 i,              /* service type */
 296                                 vectors[i],     /* irq */
 297                                 irq_mode        /* interrupt mode */);
 298                         if (child) {
 299                                 status = device_register(&child->device);
 300                                 if (status) {
 301                                         kfree(child);
 302                                         continue;
 303                                 }
 304                                 get_device(&child->device);
 305                         }
 306                 }
 307         }
 308         return 0;
 309 }
 310
 311 #ifdef CONFIG_PM
 312 static int suspend_iter(struct device *dev, void *data)
 313 {
 314         struct pcie_port_service_driver *service_driver;
 315         pm_message_t state = * (pm_message_t *) data;
 316
 317         if ((dev->bus == &pcie_port_bus_type) &&
 318             (dev->driver)) {
 319                 service_driver = to_service_driver(dev->driver);
 320                 if (service_driver->suspend)
 321                         service_driver->suspend(to_pcie_device(dev), state);
 322         }
 323         return 0;
 324 }
 325
 326 int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
 327 {
 328         return device_for_each_child(&dev->dev, &state, suspend_iter);
 329 }
 330
 331 static int resume_iter(struct device *dev, void *data)
 332 {
 333         struct pcie_port_service_driver *service_driver;
 334
 335         if ((dev->bus == &pcie_port_bus_type) &&
 336             (dev->driver)) {
 337                 service_driver = to_service_driver(dev->driver);
 338                 if (service_driver->resume)
 339                         service_driver->resume(to_pcie_device(dev));
 340         }
 341         return 0;
 342 }
 343
 344 int pcie_port_device_resume(struct pci_dev *dev)
 345 {
 346         return device_for_each_child(&dev->dev, NULL, resume_iter);
 347 }
 348 #endif
 349
 350 static int remove_iter(struct device *dev, void *data)
 351 {
 352         struct pcie_port_service_driver *service_driver;
 353
 354         if (dev->bus == &pcie_port_bus_type) {
 355                 if (dev->driver) {
 356                         service_driver = to_service_driver(dev->driver);
 357                         if (service_driver->remove)
 358                                 service_driver->remove(to_pcie_device(dev));
 359                 }
 360                 *(unsigned long*)data = (unsigned long)dev;
 361                 return 1;
 362         }
 363         return 0;
 364 }
 365
 366 void pcie_port_device_remove(struct pci_dev *dev)
 367 {
 368         struct device *device;
 369         unsigned long device_addr;
 370         int interrupt_mode = PCIE_PORT_INTx_MODE;
 371         int status;
 372
 373         do {
 374                 status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
 375                 if (status) {
 376                         device = (struct device*)device_addr;
 377                         interrupt_mode = (to_pcie_device(device))->interrupt_mode;
 378                         put_device(device);
 379                         device_unregister(device);
 380                 }
 381         } while (status);
 382         /* Switch to INTx by default if MSI enabled */
 383         if (interrupt_mode == PCIE_PORT_MSIX_MODE)
 384                 pci_disable_msix(dev);
 385         else if (interrupt_mode == PCIE_PORT_MSI_MODE)
 386                 pci_disable_msi(dev);
 387 }
 388
 389 int pcie_port_bus_register(void)
 390 {
 391         return bus_register(&pcie_port_bus_type);
 392 }
 393
 394 void pcie_port_bus_unregister(void)
 395 {
 396         bus_unregister(&pcie_port_bus_type);
 397 }
 398
 399 int pcie_port_service_register(struct pcie_port_service_driver *new)
 400 {
 401         new->driver.name = (char *)new->name;
 402         new->driver.bus = &pcie_port_bus_type;
 403         new->driver.probe = pcie_port_probe_service;
 404         new->driver.remove = pcie_port_remove_service;
 405         new->driver.shutdown = pcie_port_shutdown_service;
 406         new->driver.suspend = pcie_port_suspend_service;
 407         new->driver.resume = pcie_port_resume_service;
 408
 409         return driver_register(&new->driver);
 410 }
 411
 412 void pcie_port_service_unregister(struct pcie_port_service_driver *new)
 413 {
 414         driver_unregister(&new->driver);
 415 }
 416
 417 EXPORT_SYMBOL(pcie_port_service_register);
 418 EXPORT_SYMBOL(pcie_port_service_unregister);