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 static int pcie_portdrv_save_config(struct pci_dev *dev)
  34 {
  35         return pci_save_state(dev);
  36 }
  37
  38 static int pcie_portdrv_restore_config(struct pci_dev *dev)
  39 {
  40         int retval;
  41
  42         pci_restore_state(dev);
  43         retval = pci_enable_device(dev);
  44         if (retval)
  45                 return retval;
  46         pci_set_master(dev);
  47         return 0;
  48 }
  49
  50 /*
  51  * pcie_portdrv_probe - Probe PCI-Express port devices
  52  * @dev: PCI-Express port device being probed
  53  *
  54  * If detected invokes the pcie_port_device_register() method for
  55  * this port device.
  56  *
  57  */
  58 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
  59                                 const struct pci_device_id *id )
  60 {
  61         int                     status;
  62
  63         status = pcie_port_device_probe(dev);
  64         if (status)
  65                 return status;
  66
  67         if (pci_enable_device(dev) < 0)
  68                 return -ENODEV;
  69
  70         pci_set_master(dev);
  71         if (!dev->irq) {
  72                 printk(KERN_WARNING
  73                 "%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
  74                 __FUNCTION__, dev->device, dev->vendor);
  75         }
  76         if (pcie_port_device_register(dev))
  77                 return -ENOMEM;
  78
  79         return 0;
  80 }
  81
  82 static void pcie_portdrv_remove (struct pci_dev *dev)
  83 {
  84         pcie_port_device_remove(dev);
  85         kfree(pci_get_drvdata(dev));
  86 }
  87
  88 #ifdef CONFIG_PM
  89 static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
  90 {
  91         int ret = pcie_port_device_suspend(dev, state);
  92
  93         if (!ret)
  94                 ret = pcie_portdrv_save_config(dev);
  95         return ret;
  96 }
  97
  98 static int pcie_portdrv_resume (struct pci_dev *dev)
  99 {
 100         pcie_portdrv_restore_config(dev);
 101         return pcie_port_device_resume(dev);
 102 }
 103 #endif
 104
 105 /*
 106  * LINUX Device Driver Model
 107  */
 108 static const struct pci_device_id port_pci_ids[] = { {
 109         /* handle any PCI-Express port */
 110         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 111         }, { /* end: all zeroes */ }
 112 };
 113 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 114
 115 static struct pci_driver pcie_portdrv = {
 116         .name           = (char *)device_name,
 117         .id_table       = &port_pci_ids[0],
 118
 119         .probe          = pcie_portdrv_probe,
 120         .remove         = pcie_portdrv_remove,
 121
 122 #ifdef  CONFIG_PM
 123         .suspend        = pcie_portdrv_suspend,
 124         .resume         = pcie_portdrv_resume,
 125 #endif  /* PM */
 126 };
 127
 128 static int __init pcie_portdrv_init(void)
 129 {
 130         int retval = 0;
 131
 132         pcie_port_bus_register();
 133         retval = pci_register_driver(&pcie_portdrv);
 134         if (retval)
 135                 pcie_port_bus_unregister();
 136         return retval;
 137 }
 138
 139 static void __exit pcie_portdrv_exit(void)
 140 {
 141         pci_unregister_driver(&pcie_portdrv);
 142         pcie_port_bus_unregister();
 143 }
 144
 145 module_init(pcie_portdrv_init);
 146 module_exit(pcie_portdrv_exit);