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1// SPDX-License-Identifier: GPL-2.0-only2/*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_EISA_VLB_PRIMING)17#define EISA_FORCE_PROBE_DEFAULT 118#else19#define EISA_FORCE_PROBE_DEFAULT 020#endif21 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 before62 * 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