drivers/ide/ide-scan-pci.c

   1 /*
   2  * support for probing IDE PCI devices in the PCI bus order
   3  *
   4  * Copyright (c) 1998-2000  Andre Hedrick <andre@linux-ide.org>
   5  * Copyright (c) 1995-1998  Mark Lord
   6  *
   7  * May be copied or modified under the terms of the GNU General Public License
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/ide.h>
  14
  15 /*
  16  *      Module interfaces
  17  */
  18
  19 static int pre_init = 1;                /* Before first ordered IDE scan */
  20 static LIST_HEAD(ide_pci_drivers);
  21
  22 /*
  23  *      __ide_pci_register_driver       -       attach IDE driver
  24  *      @driver: pci driver
  25  *      @module: owner module of the driver
  26  *
  27  *      Registers a driver with the IDE layer. The IDE layer arranges that
  28  *      boot time setup is done in the expected device order and then
  29  *      hands the controllers off to the core PCI code to do the rest of
  30  *      the work.
  31  *
  32  *      Returns are the same as for pci_register_driver
  33  */
  34
  35 int __ide_pci_register_driver(struct pci_driver *driver, struct module *module,
  36                               const char *mod_name)
  37 {
  38         if (!pre_init)
  39                 return __pci_register_driver(driver, module, mod_name);
  40         driver->driver.owner = module;
  41         list_add_tail(&driver->node, &ide_pci_drivers);
  42         return 0;
  43 }
  44 EXPORT_SYMBOL_GPL(__ide_pci_register_driver);
  45
  46 /**
  47  *      ide_scan_pcidev         -       find an IDE driver for a device
  48  *      @dev: PCI device to check
  49  *
  50  *      Look for an IDE driver to handle the device we are considering.
  51  *      This is only used during boot up to get the ordering correct. After
  52  *      boot up the pci layer takes over the job.
  53  */
  54
  55 static int __init ide_scan_pcidev(struct pci_dev *dev)
  56 {
  57         struct list_head *l;
  58         struct pci_driver *d;
  59         int ret;
  60
  61         list_for_each(l, &ide_pci_drivers) {
  62                 d = list_entry(l, struct pci_driver, node);
  63                 if (d->id_table) {
  64                         const struct pci_device_id *id =
  65                                 pci_match_id(d->id_table, dev);
  66
  67                         if (id != NULL) {
  68                                 pci_assign_irq(dev);
  69                                 ret = d->probe(dev, id);
  70                                 if (ret >= 0) {
  71                                         dev->driver = d;
  72                                         pci_dev_get(dev);
  73                                         return 1;
  74                                 }
  75                         }
  76                 }
  77         }
  78         return 0;
  79 }
  80
  81 /**
  82  *      ide_scan_pcibus         -       perform the initial IDE driver scan
  83  *
  84  *      Perform the initial bus rather than driver ordered scan of the
  85  *      PCI drivers. After this all IDE pci handling becomes standard
  86  *      module ordering not traditionally ordered.
  87  */
  88
  89 static int __init ide_scan_pcibus(void)
  90 {
  91         struct pci_dev *dev = NULL;
  92         struct pci_driver *d, *tmp;
  93
  94         pre_init = 0;
  95         for_each_pci_dev(dev)
  96                 ide_scan_pcidev(dev);
  97
  98         /*
  99          *      Hand the drivers over to the PCI layer now we
 100          *      are post init.
 101          */
 102
 103         list_for_each_entry_safe(d, tmp, &ide_pci_drivers, node) {
 104                 list_del(&d->node);
 105                 if (__pci_register_driver(d, d->driver.owner,
 106                                           d->driver.mod_name))
 107                         printk(KERN_ERR "%s: failed to register %s driver\n",
 108                                         __func__, d->driver.mod_name);
 109         }
 110
 111         return 0;
 112 }
 113 device_initcall(ide_scan_pcibus);