[linux-block.git] / drivers / eisa / eisa-bus.c

// 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 signature_show(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_RO(signature);

static ssize_t enabled_show(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_RO(enabled);

static ssize_t modalias_show(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_RO(modalias);

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);
Commit	Line	Data
d1d24ed4	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* EISA bus support functions for sysfs.
	4	*
	5	* (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
1da177e4 LT	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/device.h>
	10	#include <linux/eisa.h>
	11	#include <linux/module.h>
	12	#include <linux/moduleparam.h>
	13	#include <linux/init.h>
	14	#include <linux/slab.h>
	15	#include <linux/ioport.h>
	16	#include <asm/io.h>
	17
	18	#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
	19
	20	#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
	21
	22	struct eisa_device_info {
	23	struct eisa_device_id id;
ca52a498	24	char name[50];
1da177e4 LT	25	};
	26
	27	#ifdef CONFIG_EISA_NAMES
	28	static struct eisa_device_info __initdata eisa_table[] = {
	29	#include "devlist.h"
	30	};
	31	#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
	32	#endif
	33
	34	#define EISA_MAX_FORCED_DEV 16
	35
	36	static int enable_dev[EISA_MAX_FORCED_DEV];
64a6f950	37	static unsigned int enable_dev_count;
1da177e4	38	static int disable_dev[EISA_MAX_FORCED_DEV];
64a6f950	39	static unsigned int disable_dev_count;
1da177e4	40
33fd797b TLSC	41	static int is_forced_dev(int *forced_tab,
	42	int forced_count,
	43	struct eisa_root_device *root,
	44	struct eisa_device *edev)
1da177e4 LT	45	{
	46	int i, x;
	47
	48	for (i = 0; i < forced_count; i++) {
	49	x = (root->bus_nr << 8) \| edev->slot;
	50	if (forced_tab[i] == x)
	51	return 1;
	52	}
	53
	54	return 0;
	55	}
	56
33fd797b	57	static void __init eisa_name_device(struct eisa_device *edev)
1da177e4 LT	58	{
	59	#ifdef CONFIG_EISA_NAMES
	60	int i;
	61	for (i = 0; i < EISA_INFOS; i++) {
33fd797b TLSC	62	if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
	63	strlcpy(edev->pretty_name,
	64	eisa_table[i].name,
	65	sizeof(edev->pretty_name));
1da177e4 LT	66	return;
	67	}
	68	}
	69
	70	/* No name was found */
33fd797b	71	sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig);
1da177e4 LT	72	#endif
	73	}
	74
	75	static char __init *decode_eisa_sig(unsigned long addr)
	76	{
91809d22	77	static char sig_str[EISA_SIG_LEN];
1da177e4	78	u8 sig[4];
91809d22	79	u16 rev;
1da177e4 LT	80	int i;
	81
	82	for (i = 0; i < 4; i++) {
	83	#ifdef CONFIG_EISA_VLB_PRIMING
	84	/*
	85	* This ugly stuff is used to wake up VL-bus cards
	86	* (AHA-284x is the only known example), so we can
	87	* read the EISA id.
	88	*
	89	* Thankfully, this only exists on x86...
	90	*/
	91	outb(0x80 + i, addr);
	92	#endif
33fd797b	93	sig[i] = inb(addr + i);
1da177e4 LT	94
	95	if (!i && (sig[0] & 0x80))
	96	return NULL;
	97	}
91809d22 LM	98
	99	sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
	100	sig_str[1] = (((sig[0] & 3) << 3) \| (sig[1] >> 5)) + ('A' - 1);
	101	sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
	102	rev = (sig[2] << 8) \| sig[3];
	103	sprintf(sig_str + 3, "%04X", rev);
	104
	105	return sig_str;
1da177e4 LT	106	}
1da177e4 LT	107
33fd797b	108	static int eisa_bus_match(struct device dev, struct device_driver drv)
1da177e4	109	{
33fd797b TLSC	110	struct eisa_device *edev = to_eisa_device(dev);
33fd797b TLSC	111	struct eisa_driver *edrv = to_eisa_driver(drv);
1da177e4 LT	112	const struct eisa_device_id *eids = edrv->id_table;
	113
	114	if (!eids)
	115	return 0;
	116
33fd797b TLSC	117	while (strlen(eids->sig)) {
33fd797b TLSC	118	if (!strcmp(eids->sig, edev->id.sig) &&
1da177e4 LT	119	edev->state & EISA_CONFIG_ENABLED) {
	120	edev->id.driver_data = eids->driver_data;
	121	return 1;
	122	}
	123
	124	eids++;
	125	}
	126
	127	return 0;
	128	}
	129
7eff2e7a	130	static int eisa_bus_uevent(struct device dev, struct kobj_uevent_env env)
07563c71 MT	131	{
07563c71 MT	132	struct eisa_device *edev = to_eisa_device(dev);
07563c71	133
7eff2e7a	134	add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
07563c71 MT	135	return 0;
	136	}
	137
1da177e4 LT	138	struct bus_type eisa_bus_type = {
	139	.name = "eisa",
	140	.match = eisa_bus_match,
07563c71	141	.uevent = eisa_bus_uevent,
1da177e4	142	};
33fd797b	143	EXPORT_SYMBOL(eisa_bus_type);
1da177e4	144
33fd797b	145	int eisa_driver_register(struct eisa_driver *edrv)
1da177e4	146	{
1da177e4	147	edrv->driver.bus = &eisa_bus_type;
33fd797b	148	return driver_register(&edrv->driver);
1da177e4	149	}
33fd797b	150	EXPORT_SYMBOL(eisa_driver_register);
1da177e4	151
33fd797b	152	void eisa_driver_unregister(struct eisa_driver *edrv)
1da177e4	153	{
33fd797b	154	driver_unregister(&edrv->driver);
1da177e4	155	}
33fd797b	156	EXPORT_SYMBOL(eisa_driver_unregister);
1da177e4	157
39ee156c ZL	158	static ssize_t signature_show(struct device *dev,
39ee156c ZL	159	struct device_attribute attr, char buf)
1da177e4	160	{
33fd797b TLSC	161	struct eisa_device *edev = to_eisa_device(dev);
33fd797b TLSC	162	return sprintf(buf, "%s\n", edev->id.sig);
1da177e4	163	}
39ee156c	164	static DEVICE_ATTR_RO(signature);
1da177e4	165
39ee156c ZL	166	static ssize_t enabled_show(struct device *dev,
39ee156c ZL	167	struct device_attribute attr, char buf)
1da177e4	168	{
33fd797b TLSC	169	struct eisa_device *edev = to_eisa_device(dev);
33fd797b TLSC	170	return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
1da177e4	171	}
39ee156c	172	static DEVICE_ATTR_RO(enabled);
1da177e4	173
39ee156c ZL	174	static ssize_t modalias_show(struct device *dev,
39ee156c ZL	175	struct device_attribute attr, char buf)
07563c71	176	{
33fd797b TLSC	177	struct eisa_device *edev = to_eisa_device(dev);
33fd797b TLSC	178	return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
07563c71	179	}
39ee156c	180	static DEVICE_ATTR_RO(modalias);
07563c71	181
33fd797b TLSC	182	static int __init eisa_init_device(struct eisa_root_device *root,
	183	struct eisa_device *edev,
	184	int slot)
1da177e4 LT	185	{
1da177e4 LT	186	char *sig;
33fd797b	187	unsigned long sig_addr;
1da177e4 LT	188	int i;
1da177e4 LT	189
33fd797b	190	sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;
1da177e4	191
33fd797b TLSC	192	sig = decode_eisa_sig(sig_addr);
33fd797b TLSC	193	if (!sig)
1da177e4	194	return -1; /* No EISA device here */
91809d22	195
33fd797b	196	memcpy(edev->id.sig, sig, EISA_SIG_LEN);
1da177e4	197	edev->slot = slot;
33fd797b TLSC	198	edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
	199	& EISA_CONFIG_ENABLED;
	200	edev->base_addr = SLOT_ADDRESS(root, slot);
1da177e4	201	edev->dma_mask = root->dma_mask; /* Default DMA mask */
33fd797b	202	eisa_name_device(edev);
1da177e4 LT	203	edev->dev.parent = root->dev;
	204	edev->dev.bus = &eisa_bus_type;
	205	edev->dev.dma_mask = &edev->dma_mask;
	206	edev->dev.coherent_dma_mask = edev->dma_mask;
e537b245	207	dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
1da177e4 LT	208
	209	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
	210	#ifdef CONFIG_EISA_NAMES
	211	edev->res[i].name = edev->pretty_name;
	212	#else
	213	edev->res[i].name = edev->id.sig;
	214	#endif
	215	}
	216
33fd797b	217	if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
1da177e4	218	edev->state = EISA_CONFIG_ENABLED \| EISA_CONFIG_FORCED;
91809d22	219
33fd797b	220	if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
1da177e4 LT	221	edev->state = EISA_CONFIG_FORCED;
	222
	223	return 0;
	224	}
	225
33fd797b	226	static int __init eisa_register_device(struct eisa_device *edev)
1da177e4	227	{
33fd797b	228	int rc = device_register(&edev->dev);
04df008a LK	229	if (rc) {
04df008a LK	230	put_device(&edev->dev);
42ddfd68	231	return rc;
04df008a	232	}
1da177e4	233
33fd797b TLSC	234	rc = device_create_file(&edev->dev, &dev_attr_signature);
	235	if (rc)
	236	goto err_devreg;
	237	rc = device_create_file(&edev->dev, &dev_attr_enabled);
	238	if (rc)
	239	goto err_sig;
	240	rc = device_create_file(&edev->dev, &dev_attr_modalias);
	241	if (rc)
	242	goto err_enab;
1da177e4 LT	243
1da177e4 LT	244	return 0;
42ddfd68 JG	245
42ddfd68 JG	246	err_enab:
33fd797b	247	device_remove_file(&edev->dev, &dev_attr_enabled);
42ddfd68	248	err_sig:
33fd797b	249	device_remove_file(&edev->dev, &dev_attr_signature);
42ddfd68 JG	250	err_devreg:
	251	device_unregister(&edev->dev);
	252	return rc;
1da177e4 LT	253	}
1da177e4 LT	254
33fd797b TLSC	255	static int __init eisa_request_resources(struct eisa_root_device *root,
	256	struct eisa_device *edev,
	257	int slot)
1da177e4 LT	258	{
	259	int i;
	260
	261	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
	262	/* Don't register resource for slot 0, since this is
	263	* very likely to fail... :-( Instead, grab the EISA
	264	* id, now we can display something in /proc/ioports.
	265	*/
	266
	267	/* Only one region for mainboard */
	268	if (!slot && i > 0) {
	269	edev->res[i].start = edev->res[i].end = 0;
	270	continue;
	271	}
91809d22	272
1da177e4	273	if (slot) {
765ee51f	274	edev->res[i].name = NULL;
33fd797b TLSC	275	edev->res[i].start = SLOT_ADDRESS(root, slot)
33fd797b TLSC	276	+ (i * 0x400);
1da177e4 LT	277	edev->res[i].end = edev->res[i].start + 0xff;
	278	edev->res[i].flags = IORESOURCE_IO;
	279	} else {
765ee51f	280	edev->res[i].name = NULL;
33fd797b TLSC	281	edev->res[i].start = SLOT_ADDRESS(root, slot)
33fd797b TLSC	282	+ EISA_VENDOR_ID_OFFSET;
1da177e4	283	edev->res[i].end = edev->res[i].start + 3;
76668257	284	edev->res[i].flags = IORESOURCE_IO \| IORESOURCE_BUSY;
1da177e4 LT	285	}
1da177e4 LT	286
33fd797b	287	if (request_resource(root->res, &edev->res[i]))
1da177e4 LT	288	goto failed;
	289	}
	290
	291	return 0;
91809d22	292
1da177e4 LT	293	failed:
1da177e4 LT	294	while (--i >= 0)
33fd797b	295	release_resource(&edev->res[i]);
1da177e4 LT	296
	297	return -1;
	298	}
	299
33fd797b	300	static void __init eisa_release_resources(struct eisa_device *edev)
1da177e4 LT	301	{
	302	int i;
	303
	304	for (i = 0; i < EISA_MAX_RESOURCES; i++)
	305	if (edev->res[i].start \|\| edev->res[i].end)
33fd797b	306	release_resource(&edev->res[i]);
1da177e4 LT	307	}
1da177e4 LT	308
33fd797b	309	static int __init eisa_probe(struct eisa_root_device *root)
1da177e4	310	{
91809d22	311	int i, c;
1da177e4	312	struct eisa_device *edev;
4cf9f24d	313	char *enabled_str;
1da177e4	314
4cf9f24d	315	dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
1da177e4 LT	316
	317	/* First try to get hold of slot 0. If there is no device
	318	* here, simply fail, unless root->force_probe is set. */
91809d22	319
33fd797b	320	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
3ea98d47	321	if (!edev)
1da177e4	322	return -ENOMEM;
91809d22	323
765ee51f BH	324	if (eisa_request_resources(root, edev, 0)) {
765ee51f BH	325	dev_warn(root->dev,
91809d22	326	"EISA: Cannot allocate resource for mainboard\n");
33fd797b	327	kfree(edev);
1da177e4	328	if (!root->force_probe)
765ee51f	329	return -EBUSY;
1da177e4 LT	330	goto force_probe;
	331	}
	332
765ee51f BH	333	if (eisa_init_device(root, edev, 0)) {
765ee51f BH	334	eisa_release_resources(edev);
33fd797b	335	kfree(edev);
1da177e4	336	if (!root->force_probe)
765ee51f	337	return -ENODEV;
1da177e4 LT	338	goto force_probe;
	339	}
	340
4cf9f24d	341	dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
1da177e4	342
33fd797b	343	if (eisa_register_device(edev)) {
4cf9f24d	344	dev_err(&edev->dev, "EISA: Failed to register %s\n",
91809d22	345	edev->id.sig);
33fd797b TLSC	346	eisa_release_resources(edev);
33fd797b TLSC	347	kfree(edev);
1da177e4	348	}
91809d22	349
1da177e4	350	force_probe:
91809d22 LM	351
91809d22 LM	352	for (c = 0, i = 1; i <= root->slots; i++) {
33fd797b TLSC	353	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
33fd797b TLSC	354	if (!edev) {
4cf9f24d BH	355	dev_err(root->dev, "EISA: Out of memory for slot %d\n",
4cf9f24d BH	356	i);
1da177e4 LT	357	continue;
1da177e4 LT	358	}
1da177e4	359
26abfeed BH	360	if (eisa_request_resources(root, edev, i)) {
26abfeed BH	361	dev_warn(root->dev,
91809d22 LM	362	"Cannot allocate resource for EISA slot %d\n",
91809d22 LM	363	i);
33fd797b	364	kfree(edev);
1da177e4 LT	365	continue;
1da177e4 LT	366	}
4cf9f24d	367
765ee51f BH	368	if (eisa_init_device(root, edev, i)) {
	369	eisa_release_resources(edev);
	370	kfree(edev);
	371	continue;
	372	}
	373
4cf9f24d BH	374	if (edev->state == (EISA_CONFIG_ENABLED \| EISA_CONFIG_FORCED))
	375	enabled_str = " (forced enabled)";
	376	else if (edev->state == EISA_CONFIG_FORCED)
	377	enabled_str = " (forced disabled)";
	378	else if (edev->state == 0)
	379	enabled_str = " (disabled)";
	380	else
	381	enabled_str = "";
	382
	383	dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
	384	edev->id.sig, enabled_str);
1da177e4 LT	385
	386	c++;
	387
33fd797b	388	if (eisa_register_device(edev)) {
4cf9f24d	389	dev_err(&edev->dev, "EISA: Failed to register %s\n",
91809d22	390	edev->id.sig);
33fd797b TLSC	391	eisa_release_resources(edev);
33fd797b TLSC	392	kfree(edev);
1da177e4	393	}
91809d22	394	}
1da177e4	395
4cf9f24d	396	dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
1da177e4 LT	397	return 0;
	398	}
	399
	400	static struct resource eisa_root_res = {
	401	.name = "EISA root resource",
	402	.start = 0,
	403	.end = 0xffffffff,
	404	.flags = IORESOURCE_IO,
	405	};
	406
	407	static int eisa_bus_count;
	408
33fd797b	409	int __init eisa_root_register(struct eisa_root_device *root)
1da177e4 LT	410	{
	411	int err;
	412
	413	/* Use our own resources to check if this bus base address has
	414	* been already registered. This prevents the virtual root
	415	* device from registering after the real one has, for
	416	* example... */
91809d22	417
1da177e4 LT	418	root->eisa_root_res.name = eisa_root_res.name;
	419	root->eisa_root_res.start = root->res->start;
	420	root->eisa_root_res.end = root->res->end;
	421	root->eisa_root_res.flags = IORESOURCE_BUSY;
	422
33fd797b TLSC	423	err = request_resource(&eisa_root_res, &root->eisa_root_res);
33fd797b TLSC	424	if (err)
1da177e4	425	return err;
91809d22	426
1da177e4 LT	427	root->bus_nr = eisa_bus_count++;
1da177e4 LT	428
33fd797b TLSC	429	err = eisa_probe(root);
	430	if (err)
	431	release_resource(&root->eisa_root_res);
1da177e4 LT	432
	433	return err;
	434	}
	435
33fd797b	436	static int __init eisa_init(void)
1da177e4 LT	437	{
1da177e4 LT	438	int r;
91809d22	439
33fd797b TLSC	440	r = bus_register(&eisa_bus_type);
33fd797b TLSC	441	if (r)
1da177e4 LT	442	return r;
1da177e4 LT	443
33fd797b	444	printk(KERN_INFO "EISA bus registered\n");
1da177e4 LT	445	return 0;
	446	}
	447
	448	module_param_array(enable_dev, int, &enable_dev_count, 0444);
	449	module_param_array(disable_dev, int, &disable_dev_count, 0444);
	450
33fd797b	451	postcore_initcall(eisa_init);
1da177e4 LT	452
1da177e4 LT	453	int EISA_bus; /* for legacy drivers */
33fd797b	454	EXPORT_SYMBOL(EISA_bus);