drivers/pci/pcie/portdrv_pci.c

   1 /*
   2  * File:        portdrv_pci.c
   3  * Purpose:     PCI Express Port Bus Driver
   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/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/pcieport_if.h>
  17
  18 #include "portdrv.h"
  19
  20 /*
  21  * Version Information
  22  */
  23 #define DRIVER_VERSION "v1.0"
  24 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
  25 #define DRIVER_DESC "PCIE Port Bus Driver"
  26 MODULE_AUTHOR(DRIVER_AUTHOR);
  27 MODULE_DESCRIPTION(DRIVER_DESC);
  28 MODULE_LICENSE("GPL");
  29
  30 /* global data */
  31 static const char device_name[] = "pcieport-driver";
  32
  33 /*
  34  * pcie_portdrv_probe - Probe PCI-Express port devices
  35  * @dev: PCI-Express port device being probed
  36  *
  37  * If detected invokes the pcie_port_device_register() method for
  38  * this port device.
  39  *
  40  */
  41 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
  42                                 const struct pci_device_id *id )
  43 {
  44         int                     status;
  45
  46         status = pcie_port_device_probe(dev);
  47         if (status)
  48                 return status;
  49
  50         if (pci_enable_device(dev) < 0)
  51                 return -ENODEV;
  52
  53         pci_set_master(dev);
  54         if (!dev->irq) {
  55                 printk(KERN_WARNING
  56                 "%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
  57                 __FUNCTION__, dev->device, dev->vendor);
  58         }
  59         if (pcie_port_device_register(dev)) {
  60                 pci_disable_device(dev);
  61                 return -ENOMEM;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static void pcie_portdrv_remove (struct pci_dev *dev)
  68 {
  69         pcie_port_device_remove(dev);
  70         kfree(pci_get_drvdata(dev));
  71 }
  72
  73 #ifdef CONFIG_PM
  74 static int pcie_portdrv_save_config(struct pci_dev *dev)
  75 {
  76         return pci_save_state(dev);
  77 }
  78
  79 static int pcie_portdrv_restore_config(struct pci_dev *dev)
  80 {
  81         int retval;
  82
  83         pci_restore_state(dev);
  84         retval = pci_enable_device(dev);
  85         if (retval)
  86                 return retval;
  87         pci_set_master(dev);
  88         return 0;
  89 }
  90
  91 static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
  92 {
  93         int ret = pcie_port_device_suspend(dev, state);
  94
  95         if (!ret)
  96                 ret = pcie_portdrv_save_config(dev);
  97         return ret;
  98 }
  99
 100 static int pcie_portdrv_resume (struct pci_dev *dev)
 101 {
 102         pcie_portdrv_restore_config(dev);
 103         return pcie_port_device_resume(dev);
 104 }
 105 #endif
 106
 107 /*
 108  * LINUX Device Driver Model
 109  */
 110 static const struct pci_device_id port_pci_ids[] = { {
 111         /* handle any PCI-Express port */
 112         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 113         }, { /* end: all zeroes */ }
 114 };
 115 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 116
 117 static struct pci_driver pcie_portdrv = {
 118         .name           = (char *)device_name,
 119         .id_table       = &port_pci_ids[0],
 120
 121         .probe          = pcie_portdrv_probe,
 122         .remove         = pcie_portdrv_remove,
 123
 124 #ifdef  CONFIG_PM
 125         .suspend        = pcie_portdrv_suspend,
 126         .resume         = pcie_portdrv_resume,
 127 #endif  /* PM */
 128 };
 129
 130 static int __init pcie_portdrv_init(void)
 131 {
 132         int retval;
 133
 134         retval = pcie_port_bus_register();
 135         if (retval) {
 136                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
 137                 goto out;
 138         }
 139         retval = pci_register_driver(&pcie_portdrv);
 140         if (retval)
 141                 pcie_port_bus_unregister();
 142  out:
 143         return retval;
 144 }
 145
 146 static void __exit pcie_portdrv_exit(void)
 147 {
 148         pci_unregister_driver(&pcie_portdrv);
 149         pcie_port_bus_unregister();
 150 }
 151
 152 module_init(pcie_portdrv_init);
 153 module_exit(pcie_portdrv_exit);