drivers/eisa/eisa-bus.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * EISA bus support functions for sysfs.
  *
  * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
  */

 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/eisa.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <asm/io.h>

 #define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))

 #define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }

 struct eisa_device_info {
 	struct eisa_device_id id;
 	char name[50];
 };

 #ifdef CONFIG_EISA_NAMES
 static struct eisa_device_info __initdata eisa_table[] = {
 #include "devlist.h"
 };
 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
 #endif

 #define EISA_MAX_FORCED_DEV 16

 static int enable_dev[EISA_MAX_FORCED_DEV];
 static unsigned int enable_dev_count;
 static int disable_dev[EISA_MAX_FORCED_DEV];
 static unsigned int disable_dev_count;

 static int is_forced_dev(int *forced_tab,
 			 int forced_count,
 			 struct eisa_root_device *root,
 			 struct eisa_device *edev)
 {
 	int i, x;

 	for (i = 0; i < forced_count; i++) {
 		x = (root->bus_nr << 8) | edev->slot;
 		if (forced_tab[i] == x)
 			return 1;
 	}

 	return 0;
 }

 static void __init eisa_name_device(struct eisa_device *edev)
 {
 #ifdef CONFIG_EISA_NAMES
 	int i;
 	for (i = 0; i < EISA_INFOS; i++) {
 		if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
 			strlcpy(edev->pretty_name,
 				eisa_table[i].name,
 				sizeof(edev->pretty_name));
 			return;
 		}
 	}

 	/* No name was found */
 	sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig);
 #endif
 }

 static char __init *decode_eisa_sig(unsigned long addr)
 {
 	static char sig_str[EISA_SIG_LEN];
 	u8 sig[4];
 	u16 rev;
 	int i;

 	for (i = 0; i < 4; i++) {
 #ifdef CONFIG_EISA_VLB_PRIMING
 		/*
 		 * This ugly stuff is used to wake up VL-bus cards
 		 * (AHA-284x is the only known example), so we can
 		 * read the EISA id.
 		 *
 		 * Thankfully, this only exists on x86...
 		 */
 		outb(0x80 + i, addr);
 #endif
 		sig[i] = inb(addr + i);

 		if (!i && (sig[0] & 0x80))
 			return NULL;
 	}

 	sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
 	sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
 	sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
 	rev = (sig[2] << 8) | sig[3];
 	sprintf(sig_str + 3, "%04X", rev);

 	return sig_str;
 }

 static int eisa_bus_match(struct device *dev, struct device_driver *drv)
 {
 	struct eisa_device *edev = to_eisa_device(dev);
 	struct eisa_driver *edrv = to_eisa_driver(drv);
 	const struct eisa_device_id *eids = edrv->id_table;

 	if (!eids)
 		return 0;

 	while (strlen(eids->sig)) {
 		if (!strcmp(eids->sig, edev->id.sig) &&
 		    edev->state & EISA_CONFIG_ENABLED) {
 			edev->id.driver_data = eids->driver_data;
 			return 1;
 		}

 		eids++;
 	}

 	return 0;
 }

 static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
 	struct eisa_device *edev = to_eisa_device(dev);

 	add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
 	return 0;
 }

 struct bus_type eisa_bus_type = {
 	.name  = "eisa",
 	.match = eisa_bus_match,
 	.uevent = eisa_bus_uevent,
 };
 EXPORT_SYMBOL(eisa_bus_type);

 int eisa_driver_register(struct eisa_driver *edrv)
 {
 	edrv->driver.bus = &eisa_bus_type;
 	return driver_register(&edrv->driver);
 }
 EXPORT_SYMBOL(eisa_driver_register);

 void eisa_driver_unregister(struct eisa_driver *edrv)
 {
 	driver_unregister(&edrv->driver);
 }
 EXPORT_SYMBOL(eisa_driver_unregister);

 static ssize_t eisa_show_sig(struct device *dev, struct device_attribute *attr,
 			     char *buf)
 {
 	struct eisa_device *edev = to_eisa_device(dev);
 	return sprintf(buf, "%s\n", edev->id.sig);
 }

 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);

 static ssize_t eisa_show_state(struct device *dev,
 			       struct device_attribute *attr,
 			       char *buf)
 {
 	struct eisa_device *edev = to_eisa_device(dev);
 	return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
 }

 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);

 static ssize_t eisa_show_modalias(struct device *dev,
 				  struct device_attribute *attr,
 				  char *buf)
 {
 	struct eisa_device *edev = to_eisa_device(dev);
 	return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
 }

 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);

 static int __init eisa_init_device(struct eisa_root_device *root,
 				   struct eisa_device *edev,
 				   int slot)
 {
 	char *sig;
 	unsigned long sig_addr;
 	int i;

 	sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;

 	sig = decode_eisa_sig(sig_addr);
 	if (!sig)
 		return -1;	/* No EISA device here */

 	memcpy(edev->id.sig, sig, EISA_SIG_LEN);
 	edev->slot = slot;
 	edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
 		      & EISA_CONFIG_ENABLED;
 	edev->base_addr = SLOT_ADDRESS(root, slot);
 	edev->dma_mask = root->dma_mask; /* Default DMA mask */
 	eisa_name_device(edev);
 	edev->dev.parent = root->dev;
 	edev->dev.bus = &eisa_bus_type;
 	edev->dev.dma_mask = &edev->dma_mask;
 	edev->dev.coherent_dma_mask = edev->dma_mask;
 	dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);

 	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 #ifdef CONFIG_EISA_NAMES
 		edev->res[i].name = edev->pretty_name;
 #else
 		edev->res[i].name = edev->id.sig;
 #endif
 	}

 	if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
 		edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;

 	if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
 		edev->state = EISA_CONFIG_FORCED;

 	return 0;
 }

 static int __init eisa_register_device(struct eisa_device *edev)
 {
 	int rc = device_register(&edev->dev);
 	if (rc) {
 		put_device(&edev->dev);
 		return rc;
 	}

 	rc = device_create_file(&edev->dev, &dev_attr_signature);
 	if (rc)
 		goto err_devreg;
 	rc = device_create_file(&edev->dev, &dev_attr_enabled);
 	if (rc)
 		goto err_sig;
 	rc = device_create_file(&edev->dev, &dev_attr_modalias);
 	if (rc)
 		goto err_enab;

 	return 0;

 err_enab:
 	device_remove_file(&edev->dev, &dev_attr_enabled);
 err_sig:
 	device_remove_file(&edev->dev, &dev_attr_signature);
 err_devreg:
 	device_unregister(&edev->dev);
 	return rc;
 }

 static int __init eisa_request_resources(struct eisa_root_device *root,
 					 struct eisa_device *edev,
 					 int slot)
 {
 	int i;

 	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
 		/* Don't register resource for slot 0, since this is
 		 * very likely to fail... :-( Instead, grab the EISA
 		 * id, now we can display something in /proc/ioports.
 		 */

 		/* Only one region for mainboard */
 		if (!slot && i > 0) {
 			edev->res[i].start = edev->res[i].end = 0;
 			continue;
 		}

 		if (slot) {
 			edev->res[i].name  = NULL;
 			edev->res[i].start = SLOT_ADDRESS(root, slot)
 					     + (i * 0x400);
 			edev->res[i].end   = edev->res[i].start + 0xff;
 			edev->res[i].flags = IORESOURCE_IO;
 		} else {
 			edev->res[i].name  = NULL;
 			edev->res[i].start = SLOT_ADDRESS(root, slot)
 					     + EISA_VENDOR_ID_OFFSET;
 			edev->res[i].end   = edev->res[i].start + 3;
 			edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY;
 		}

 		if (request_resource(root->res, &edev->res[i]))
 			goto failed;
 	}

 	return 0;

  failed:
 	while (--i >= 0)
 		release_resource(&edev->res[i]);

 	return -1;
 }

 static void __init eisa_release_resources(struct eisa_device *edev)
 {
 	int i;

 	for (i = 0; i < EISA_MAX_RESOURCES; i++)
 		if (edev->res[i].start || edev->res[i].end)
 			release_resource(&edev->res[i]);
 }

 static int __init eisa_probe(struct eisa_root_device *root)
 {
 	int i, c;
 	struct eisa_device *edev;
 	char *enabled_str;

 	dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);

 	/* First try to get hold of slot 0. If there is no device
 	 * here, simply fail, unless root->force_probe is set. */

 	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 	if (!edev)
 		return -ENOMEM;

 	if (eisa_request_resources(root, edev, 0)) {
 		dev_warn(root->dev,
 			 "EISA: Cannot allocate resource for mainboard\n");
 		kfree(edev);
 		if (!root->force_probe)
 			return -EBUSY;
 		goto force_probe;
 	}

 	if (eisa_init_device(root, edev, 0)) {
 		eisa_release_resources(edev);
 		kfree(edev);
 		if (!root->force_probe)
 			return -ENODEV;
 		goto force_probe;
 	}

 	dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);

 	if (eisa_register_device(edev)) {
 		dev_err(&edev->dev, "EISA: Failed to register %s\n",
 			edev->id.sig);
 		eisa_release_resources(edev);
 		kfree(edev);
 	}

  force_probe:

 	for (c = 0, i = 1; i <= root->slots; i++) {
 		edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 		if (!edev) {
 			dev_err(root->dev, "EISA: Out of memory for slot %d\n",
 				i);
 			continue;
 		}

 		if (eisa_request_resources(root, edev, i)) {
 			dev_warn(root->dev,
 				 "Cannot allocate resource for EISA slot %d\n",
 				 i);
 			kfree(edev);
 			continue;
 		}

 		if (eisa_init_device(root, edev, i)) {
 			eisa_release_resources(edev);
 			kfree(edev);
 			continue;
 		}

 		if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
 			enabled_str = " (forced enabled)";
 		else if (edev->state == EISA_CONFIG_FORCED)
 			enabled_str = " (forced disabled)";
 		else if (edev->state == 0)
 			enabled_str = " (disabled)";
 		else
 			enabled_str = "";

 		dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
 			 edev->id.sig, enabled_str);

 		c++;

 		if (eisa_register_device(edev)) {
 			dev_err(&edev->dev, "EISA: Failed to register %s\n",
 				edev->id.sig);
 			eisa_release_resources(edev);
 			kfree(edev);
 		}
 	}

 	dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
 	return 0;
 }

 static struct resource eisa_root_res = {
 	.name  = "EISA root resource",
 	.start = 0,
 	.end   = 0xffffffff,
 	.flags = IORESOURCE_IO,
 };

 static int eisa_bus_count;

 int __init eisa_root_register(struct eisa_root_device *root)
 {
 	int err;

 	/* Use our own resources to check if this bus base address has
 	 * been already registered. This prevents the virtual root
 	 * device from registering after the real one has, for
 	 * example... */

 	root->eisa_root_res.name  = eisa_root_res.name;
 	root->eisa_root_res.start = root->res->start;
 	root->eisa_root_res.end   = root->res->end;
 	root->eisa_root_res.flags = IORESOURCE_BUSY;

 	err = request_resource(&eisa_root_res, &root->eisa_root_res);
 	if (err)
 		return err;

 	root->bus_nr = eisa_bus_count++;

 	err = eisa_probe(root);
 	if (err)
 		release_resource(&root->eisa_root_res);

 	return err;
 }

 static int __init eisa_init(void)
 {
 	int r;

 	r = bus_register(&eisa_bus_type);
 	if (r)
 		return r;

 	printk(KERN_INFO "EISA bus registered\n");
 	return 0;
 }

 module_param_array(enable_dev, int, &enable_dev_count, 0444);
 module_param_array(disable_dev, int, &disable_dev_count, 0444);

 postcore_initcall(eisa_init);

 int EISA_bus;		/* for legacy drivers */
 EXPORT_SYMBOL(EISA_bus);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* EISA bus support functions for sysfs.
	*
	* (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
	*/

	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/eisa.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/ioport.h>
	#include <asm/io.h>

	#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))

	#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }

	struct eisa_device_info {
	struct eisa_device_id id;
	char name[50];
	};

	#ifdef CONFIG_EISA_NAMES
	static struct eisa_device_info __initdata eisa_table[] = {
	#include "devlist.h"
	};
	#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
	#endif

	#define EISA_MAX_FORCED_DEV 16

	static int enable_dev[EISA_MAX_FORCED_DEV];
	static unsigned int enable_dev_count;
	static int disable_dev[EISA_MAX_FORCED_DEV];
	static unsigned int disable_dev_count;

	static int is_forced_dev(int *forced_tab,
	int forced_count,
	struct eisa_root_device *root,
	struct eisa_device *edev)
	{
	int i, x;

	for (i = 0; i < forced_count; i++) {
	x = (root->bus_nr << 8) \| edev->slot;
	if (forced_tab[i] == x)
	return 1;
	}

	return 0;
	}

	static void __init eisa_name_device(struct eisa_device *edev)
	{
	#ifdef CONFIG_EISA_NAMES
	int i;
	for (i = 0; i < EISA_INFOS; i++) {
	if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
	strlcpy(edev->pretty_name,
	eisa_table[i].name,
	sizeof(edev->pretty_name));
	return;
	}
	}

	/* No name was found */
	sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig);
	#endif
	}

	static char __init *decode_eisa_sig(unsigned long addr)
	{
	static char sig_str[EISA_SIG_LEN];
	u8 sig[4];
	u16 rev;
	int i;

	for (i = 0; i < 4; i++) {
	#ifdef CONFIG_EISA_VLB_PRIMING
	/*
	* This ugly stuff is used to wake up VL-bus cards
	* (AHA-284x is the only known example), so we can
	* read the EISA id.
	*
	* Thankfully, this only exists on x86...
	*/
	outb(0x80 + i, addr);
	#endif
	sig[i] = inb(addr + i);

	if (!i && (sig[0] & 0x80))
	return NULL;
	}

	sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
	sig_str[1] = (((sig[0] & 3) << 3) \| (sig[1] >> 5)) + ('A' - 1);
	sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
	rev = (sig[2] << 8) \| sig[3];
	sprintf(sig_str + 3, "%04X", rev);

	return sig_str;
	}

	static int eisa_bus_match(struct device dev, struct device_driver drv)
	{
	struct eisa_device *edev = to_eisa_device(dev);
	struct eisa_driver *edrv = to_eisa_driver(drv);
	const struct eisa_device_id *eids = edrv->id_table;

	if (!eids)
	return 0;

	while (strlen(eids->sig)) {
	if (!strcmp(eids->sig, edev->id.sig) &&
	edev->state & EISA_CONFIG_ENABLED) {
	edev->id.driver_data = eids->driver_data;
	return 1;
	}

	eids++;
	}

	return 0;
	}

	static int eisa_bus_uevent(struct device dev, struct kobj_uevent_env env)
	{
	struct eisa_device *edev = to_eisa_device(dev);

	add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
	return 0;
	}

	struct bus_type eisa_bus_type = {
	.name = "eisa",
	.match = eisa_bus_match,
	.uevent = eisa_bus_uevent,
	};
	EXPORT_SYMBOL(eisa_bus_type);

	int eisa_driver_register(struct eisa_driver *edrv)
	{
	edrv->driver.bus = &eisa_bus_type;
	return driver_register(&edrv->driver);
	}
	EXPORT_SYMBOL(eisa_driver_register);

	void eisa_driver_unregister(struct eisa_driver *edrv)
	{
	driver_unregister(&edrv->driver);
	}
	EXPORT_SYMBOL(eisa_driver_unregister);

	static ssize_t eisa_show_sig(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct eisa_device *edev = to_eisa_device(dev);
	return sprintf(buf, "%s\n", edev->id.sig);
	}

	static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);

	static ssize_t eisa_show_state(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct eisa_device *edev = to_eisa_device(dev);
	return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
	}

	static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);

	static ssize_t eisa_show_modalias(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct eisa_device *edev = to_eisa_device(dev);
	return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
	}

	static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);

	static int __init eisa_init_device(struct eisa_root_device *root,
	struct eisa_device *edev,
	int slot)
	{
	char *sig;
	unsigned long sig_addr;
	int i;

	sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;

	sig = decode_eisa_sig(sig_addr);
	if (!sig)
	return -1; /* No EISA device here */

	memcpy(edev->id.sig, sig, EISA_SIG_LEN);
	edev->slot = slot;
	edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
	& EISA_CONFIG_ENABLED;
	edev->base_addr = SLOT_ADDRESS(root, slot);
	edev->dma_mask = root->dma_mask; /* Default DMA mask */
	eisa_name_device(edev);
	edev->dev.parent = root->dev;
	edev->dev.bus = &eisa_bus_type;
	edev->dev.dma_mask = &edev->dma_mask;
	edev->dev.coherent_dma_mask = edev->dma_mask;
	dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);

	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
	#ifdef CONFIG_EISA_NAMES
	edev->res[i].name = edev->pretty_name;
	#else
	edev->res[i].name = edev->id.sig;
	#endif
	}

	if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
	edev->state = EISA_CONFIG_ENABLED \| EISA_CONFIG_FORCED;

	if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
	edev->state = EISA_CONFIG_FORCED;

	return 0;
	}

	static int __init eisa_register_device(struct eisa_device *edev)
	{
	int rc = device_register(&edev->dev);
	if (rc) {
	put_device(&edev->dev);
	return rc;
	}

	rc = device_create_file(&edev->dev, &dev_attr_signature);
	if (rc)
	goto err_devreg;
	rc = device_create_file(&edev->dev, &dev_attr_enabled);
	if (rc)
	goto err_sig;
	rc = device_create_file(&edev->dev, &dev_attr_modalias);
	if (rc)
	goto err_enab;

	return 0;

	err_enab:
	device_remove_file(&edev->dev, &dev_attr_enabled);
	err_sig:
	device_remove_file(&edev->dev, &dev_attr_signature);
	err_devreg:
	device_unregister(&edev->dev);
	return rc;
	}

	static int __init eisa_request_resources(struct eisa_root_device *root,
	struct eisa_device *edev,
	int slot)
	{
	int i;

	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
	/* Don't register resource for slot 0, since this is
	* very likely to fail... :-( Instead, grab the EISA
	* id, now we can display something in /proc/ioports.
	*/

	/* Only one region for mainboard */
	if (!slot && i > 0) {
	edev->res[i].start = edev->res[i].end = 0;
	continue;
	}

	if (slot) {
	edev->res[i].name = NULL;
	edev->res[i].start = SLOT_ADDRESS(root, slot)
	+ (i * 0x400);
	edev->res[i].end = edev->res[i].start + 0xff;
	edev->res[i].flags = IORESOURCE_IO;
	} else {
	edev->res[i].name = NULL;
	edev->res[i].start = SLOT_ADDRESS(root, slot)
	+ EISA_VENDOR_ID_OFFSET;
	edev->res[i].end = edev->res[i].start + 3;
	edev->res[i].flags = IORESOURCE_IO \| IORESOURCE_BUSY;
	}

	if (request_resource(root->res, &edev->res[i]))
	goto failed;
	}

	return 0;

	failed:
	while (--i >= 0)
	release_resource(&edev->res[i]);

	return -1;
	}

	static void __init eisa_release_resources(struct eisa_device *edev)
	{
	int i;

	for (i = 0; i < EISA_MAX_RESOURCES; i++)
	if (edev->res[i].start \|\| edev->res[i].end)
	release_resource(&edev->res[i]);
	}

	static int __init eisa_probe(struct eisa_root_device *root)
	{
	int i, c;
	struct eisa_device *edev;
	char *enabled_str;

	dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);

	/* First try to get hold of slot 0. If there is no device
	* here, simply fail, unless root->force_probe is set. */

	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
	if (!edev)
	return -ENOMEM;

	if (eisa_request_resources(root, edev, 0)) {
	dev_warn(root->dev,
	"EISA: Cannot allocate resource for mainboard\n");
	kfree(edev);
	if (!root->force_probe)
	return -EBUSY;
	goto force_probe;
	}

	if (eisa_init_device(root, edev, 0)) {
	eisa_release_resources(edev);
	kfree(edev);
	if (!root->force_probe)
	return -ENODEV;
	goto force_probe;
	}

	dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);

	if (eisa_register_device(edev)) {
	dev_err(&edev->dev, "EISA: Failed to register %s\n",
	edev->id.sig);
	eisa_release_resources(edev);
	kfree(edev);
	}

	force_probe:

	for (c = 0, i = 1; i <= root->slots; i++) {
	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
	if (!edev) {
	dev_err(root->dev, "EISA: Out of memory for slot %d\n",
	i);
	continue;
	}

	if (eisa_request_resources(root, edev, i)) {
	dev_warn(root->dev,
	"Cannot allocate resource for EISA slot %d\n",
	i);
	kfree(edev);
	continue;
	}

	if (eisa_init_device(root, edev, i)) {
	eisa_release_resources(edev);
	kfree(edev);
	continue;
	}

	if (edev->state == (EISA_CONFIG_ENABLED \| EISA_CONFIG_FORCED))
	enabled_str = " (forced enabled)";
	else if (edev->state == EISA_CONFIG_FORCED)
	enabled_str = " (forced disabled)";
	else if (edev->state == 0)
	enabled_str = " (disabled)";
	else
	enabled_str = "";

	dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
	edev->id.sig, enabled_str);

	c++;

	if (eisa_register_device(edev)) {
	dev_err(&edev->dev, "EISA: Failed to register %s\n",
	edev->id.sig);
	eisa_release_resources(edev);
	kfree(edev);
	}
	}

	dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
	return 0;
	}

	static struct resource eisa_root_res = {
	.name = "EISA root resource",
	.start = 0,
	.end = 0xffffffff,
	.flags = IORESOURCE_IO,
	};

	static int eisa_bus_count;

	int __init eisa_root_register(struct eisa_root_device *root)
	{
	int err;

	/* Use our own resources to check if this bus base address has
	* been already registered. This prevents the virtual root
	* device from registering after the real one has, for
	* example... */

	root->eisa_root_res.name = eisa_root_res.name;
	root->eisa_root_res.start = root->res->start;
	root->eisa_root_res.end = root->res->end;
	root->eisa_root_res.flags = IORESOURCE_BUSY;

	err = request_resource(&eisa_root_res, &root->eisa_root_res);
	if (err)
	return err;

	root->bus_nr = eisa_bus_count++;

	err = eisa_probe(root);
	if (err)
	release_resource(&root->eisa_root_res);

	return err;
	}

	static int __init eisa_init(void)
	{
	int r;

	r = bus_register(&eisa_bus_type);
	if (r)
	return r;

	printk(KERN_INFO "EISA bus registered\n");
	return 0;
	}

	module_param_array(enable_dev, int, &enable_dev_count, 0444);
	module_param_array(disable_dev, int, &disable_dev_count, 0444);

	postcore_initcall(eisa_init);

	int EISA_bus; /* for legacy drivers */
	EXPORT_SYMBOL(EISA_bus);