LXR linux/drivers/eisa/virtual

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Virtual EISA root driver.
   4 * Acts as a placeholder if we don't have a proper EISA bridge.
   5 *
   6 * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/platform_device.h>
  11#include <linux/eisa.h>
  12#include <linux/module.h>
  13#include <linux/moduleparam.h>
  14#include <linux/init.h>
  15
  16#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
  17#define EISA_FORCE_PROBE_DEFAULT 1
  18#else
  19#define EISA_FORCE_PROBE_DEFAULT 0
  20#endif
  21
  22static int force_probe = EISA_FORCE_PROBE_DEFAULT;
  23static void virtual_eisa_release (struct device *);
  24
  25/* The default EISA device parent (virtual root device).
  26 * Now use a platform device, since that's the obvious choice. */
  27
  28static struct platform_device eisa_root_dev = {
  29        .name = "eisa",
  30        .id   = 0,
  31        .dev  = {
  32                .release = virtual_eisa_release,
  33        },
  34};
  35
  36static struct eisa_root_device eisa_bus_root = {
  37        .dev            = &eisa_root_dev.dev,
  38        .bus_base_addr  = 0,
  39        .res            = &ioport_resource,
  40        .slots          = EISA_MAX_SLOTS,
  41        .dma_mask       = 0xffffffff,
  42};
  43
  44static void virtual_eisa_release (struct device *dev)
  45{
  46        /* nothing really to do here */
  47}
  48
  49static int __init virtual_eisa_root_init (void)
  50{
  51        int r;
  52
  53        if ((r = platform_device_register (&eisa_root_dev)))
  54                return r;
  55
  56        eisa_bus_root.force_probe = force_probe;
  57
  58        dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root);
  59
  60        if (eisa_root_register (&eisa_bus_root)) {
  61                /* A real bridge may have been registered before
  62                 * us. So quietly unregister. */
  63                platform_device_unregister (&eisa_root_dev);
  64                return -1;
  65        }
  66
  67        return 0;
  68}
  69
  70module_param (force_probe, int, 0444);
  71
  72device_initcall (virtual_eisa_root_init);
  73