73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Virtual EISA root driver.
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* Acts as a placeholder if we don't have a proper EISA bridge.
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*
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* (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/eisa.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#if defined(CONFIG_ALPHA_JENSEN) || defined(CONFIG_EISA_VLB_PRIMING)
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#define EISA_FORCE_PROBE_DEFAULT 1
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#else
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#define EISA_FORCE_PROBE_DEFAULT 0
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#endif
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static int force_probe = EISA_FORCE_PROBE_DEFAULT;
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static void virtual_eisa_release (struct device *);
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/* The default EISA device parent (virtual root device).
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* Now use a platform device, since that's the obvious choice. */
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static struct platform_device eisa_root_dev = {
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.name = "eisa",
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.id = 0,
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.dev = {
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.release = virtual_eisa_release,
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},
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};
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static struct eisa_root_device eisa_bus_root = {
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.dev = &eisa_root_dev.dev,
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.bus_base_addr = 0,
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.res = &ioport_resource,
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.slots = EISA_MAX_SLOTS,
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.dma_mask = 0xffffffff,
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};
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static void virtual_eisa_release (struct device *dev)
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{
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/* nothing really to do here */
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}
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static int __init virtual_eisa_root_init (void)
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{
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int r;
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if ((r = platform_device_register (&eisa_root_dev)))
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return r;
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eisa_bus_root.force_probe = force_probe;
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dev_set_drvdata(&eisa_root_dev.dev, &eisa_bus_root);
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if (eisa_root_register (&eisa_bus_root)) {
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/* A real bridge may have been registered before
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* us. So quietly unregister. */
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platform_device_unregister (&eisa_root_dev);
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return -1;
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}
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return 0;
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}
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module_param (force_probe, int, 0444);
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device_initcall (virtual_eisa_root_init);
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