linux/drivers/eisa/virtual_root.c
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   1/*
   2 * Virtual EISA root driver.
   3 * Acts as a placeholder if we don't have a proper EISA bridge.
   4 *
   5 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
   6 *
   7 * This code is released under the GPL version 2.
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/platform_device.h>
  12#include <linux/eisa.h>
  13#include <linux/module.h>
  14#include <linux/moduleparam.h>
  15#include <linux/init.h>
  16
  17#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
  18#define EISA_FORCE_PROBE_DEFAULT 1
  19#else
  20#define EISA_FORCE_PROBE_DEFAULT 0
  21#endif
  22
  23static int force_probe = EISA_FORCE_PROBE_DEFAULT;
  24static void virtual_eisa_release (struct device *);
  25
  26/* The default EISA device parent (virtual root device).
  27 * Now use a platform device, since that's the obvious choice. */
  28
  29static struct platform_device eisa_root_dev = {
  30        .name = "eisa",
  31        .id   = 0,
  32        .dev  = {
  33                .release = virtual_eisa_release,
  34        },
  35};
  36
  37static struct eisa_root_device eisa_bus_root = {
  38        .dev           = &eisa_root_dev.dev,
  39        .bus_base_addr = 0,
  40        .res           = &ioport_resource,
  41        .slots         = EISA_MAX_SLOTS,
  42        .dma_mask      = 0xffffffff,
  43};
  44
  45static void virtual_eisa_release (struct device *dev)
  46{
  47        /* nothing really to do here */
  48}
  49
  50static int __init virtual_eisa_root_init (void)
  51{
  52        int r;
  53        
  54        if ((r = platform_device_register (&eisa_root_dev))) {
  55                return r;
  56        }
  57
  58        eisa_bus_root.force_probe = force_probe;
  59        
  60        dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root);
  61
  62        if (eisa_root_register (&eisa_bus_root)) {
  63                /* A real bridge may have been registered before
  64                 * us. So quietly unregister. */
  65                platform_device_unregister (&eisa_root_dev);
  66                return -1;
  67        }
  68
  69        return 0;
  70}
  71
  72module_param (force_probe, int, 0444);
  73
  74device_initcall (virtual_eisa_root_init);
  75
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