[mirror_ubuntu-focal-kernel.git] / arch / powerpc / kernel / isa-bridge.c

/*
 * Routines for tracking a legacy ISA bridge
 *
 * Copyrigh 2007 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
 *
 * Some bits and pieces moved over from pci_64.c
 *
 * Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#define DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/notifier.h>

#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/ppc-pci.h>
#include <asm/isa-bridge.h>

unsigned long isa_io_base;	/* NULL if no ISA bus */
EXPORT_SYMBOL(isa_io_base);

/* Cached ISA bridge dev. */
static struct device_node *isa_bridge_devnode;
struct pci_dev *isa_bridge_pcidev;
EXPORT_SYMBOL_GPL(isa_bridge_pcidev);

#define ISA_SPACE_MASK 0x1
#define ISA_SPACE_IO 0x1

static void pci_process_ISA_OF_ranges(struct device_node *isa_node,
				      unsigned long phb_io_base_phys)
{
	/* We should get some saner parsing here and remove these structs */
	struct pci_address {
		u32 a_hi;
		u32 a_mid;
		u32 a_lo;
	};

	struct isa_address {
		u32 a_hi;
		u32 a_lo;
	};

	struct isa_range {
		struct isa_address isa_addr;
		struct pci_address pci_addr;
		unsigned int size;
	};

	const struct isa_range *range;
	unsigned long pci_addr;
	unsigned int isa_addr;
	unsigned int size;
	int rlen = 0;

	range = of_get_property(isa_node, "ranges", &rlen);
	if (range == NULL || (rlen < sizeof(struct isa_range)))
		goto inval_range;

	/* From "ISA Binding to 1275"
	 * The ranges property is laid out as an array of elements,
	 * each of which comprises:
	 *   cells 0 - 1:	an ISA address
	 *   cells 2 - 4:	a PCI address
	 *			(size depending on dev->n_addr_cells)
	 *   cell 5:		the size of the range
	 */
	if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) {
		range++;
		rlen -= sizeof(struct isa_range);
		if (rlen < sizeof(struct isa_range))
			goto inval_range;
	}
	if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO)
		goto inval_range;

	isa_addr = range->isa_addr.a_lo;
	pci_addr = (unsigned long) range->pci_addr.a_mid << 32 |
		range->pci_addr.a_lo;

	/* Assume these are both zero. Note: We could fix that and
	 * do a proper parsing instead ... oh well, that will do for
	 * now as nobody uses fancy mappings for ISA bridges
	 */
	if ((pci_addr != 0) || (isa_addr != 0)) {
		printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
		       __func__);
		return;
	}

	/* Align size and make sure it's cropped to 64K */
	size = PAGE_ALIGN(range->size);
	if (size > 0x10000)
		size = 0x10000;

	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
		     size, pgprot_noncached(PAGE_KERNEL));
	return;

inval_range:
	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
	       "mapping 64k\n");
	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
		     0x10000, pgprot_noncached(PAGE_KERNEL));
}


/**
 * isa_bridge_find_early - Find and map the ISA IO space early before
 *                         main PCI discovery. This is optionally called by
 *                         the arch code when adding PCI PHBs to get early
 *                         access to ISA IO ports
 */
void __init isa_bridge_find_early(struct pci_controller *hose)
{
	struct device_node *np, *parent = NULL, *tmp;

	/* If we already have an ISA bridge, bail off */
	if (isa_bridge_devnode != NULL)
		return;

	/* For each "isa" node in the system. Note : we do a search by
	 * type and not by name. It might be better to do by name but that's
	 * what the code used to do and I don't want to break too much at
	 * once. We can look into changing that separately
	 */
	for_each_node_by_type(np, "isa") {
		/* Look for our hose being a parent */
		for (parent = of_get_parent(np); parent;) {
			if (parent == hose->dn) {
				of_node_put(parent);
				break;
			}
			tmp = parent;
			parent = of_get_parent(parent);
			of_node_put(tmp);
		}
		if (parent != NULL)
			break;
	}
	if (np == NULL)
		return;
	isa_bridge_devnode = np;

	/* Now parse the "ranges" property and setup the ISA mapping */
	pci_process_ISA_OF_ranges(np, hose->io_base_phys);

	/* Set the global ISA io base to indicate we have an ISA bridge */
	isa_io_base = ISA_IO_BASE;

	pr_debug("ISA bridge (early) is %pOF\n", np);
}

/**
 * isa_bridge_find_early - Find and map the ISA IO space early before
 *                         main PCI discovery. This is optionally called by
 *                         the arch code when adding PCI PHBs to get early
 *                         access to ISA IO ports
 */
void __init isa_bridge_init_non_pci(struct device_node *np)
{
	const __be32 *ranges, *pbasep = NULL;
	int rlen, i, rs;
	u32 na, ns, pna;
	u64 cbase, pbase, size = 0;

	/* If we already have an ISA bridge, bail off */
	if (isa_bridge_devnode != NULL)
		return;

	pna = of_n_addr_cells(np);
	if (of_property_read_u32(np, "#address-cells", &na) ||
	    of_property_read_u32(np, "#size-cells", &ns)) {
		pr_warn("ISA: Non-PCI bridge %pOF is missing address format\n",
			np);
		return;
	}

	/* Check it's a supported address format */
	if (na != 2 || ns != 1) {
		pr_warn("ISA: Non-PCI bridge %pOF has unsupported address format\n",
			np);
		return;
	}
	rs = na + ns + pna;

	/* Grab the ranges property */
	ranges = of_get_property(np, "ranges", &rlen);
	if (ranges == NULL || rlen < rs) {
		pr_warn("ISA: Non-PCI bridge %pOF has absent or invalid ranges\n",
			np);
		return;
	}

	/* Parse it. We are only looking for IO space */
	for (i = 0; (i + rs - 1) < rlen; i += rs) {
		if (be32_to_cpup(ranges + i) != 1)
			continue;
		cbase = be32_to_cpup(ranges + i + 1);
		size = of_read_number(ranges + i + na + pna, ns);
		pbasep = ranges + i + na;
		break;
	}

	/* Got something ? */
	if (!size || !pbasep) {
		pr_warn("ISA: Non-PCI bridge %pOF has no usable IO range\n",
			np);
		return;
	}

	/* Align size and make sure it's cropped to 64K */
	size = PAGE_ALIGN(size);
	if (size > 0x10000)
		size = 0x10000;

	/* Map pbase */
	pbase = of_translate_address(np, pbasep);
	if (pbase == OF_BAD_ADDR) {
		pr_warn("ISA: Non-PCI bridge %pOF failed to translate IO base\n",
			np);
		return;
	}

	/* We need page alignment */
	if ((cbase & ~PAGE_MASK) || (pbase & ~PAGE_MASK)) {
		pr_warn("ISA: Non-PCI bridge %pOF has non aligned IO range\n",
			np);
		return;
	}

	/* Got it */
	isa_bridge_devnode = np;

	/* Set the global ISA io base to indicate we have an ISA bridge
	 * and map it
	 */
	isa_io_base = ISA_IO_BASE;
	__ioremap_at(pbase, (void *)ISA_IO_BASE,
		     size, pgprot_noncached(PAGE_KERNEL));

	pr_debug("ISA: Non-PCI bridge is %pOF\n", np);
}

/**
 * isa_bridge_find_late - Find and map the ISA IO space upon discovery of
 *                        a new ISA bridge
 */
static void isa_bridge_find_late(struct pci_dev *pdev,
				 struct device_node *devnode)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);

	/* Store ISA device node and PCI device */
	isa_bridge_devnode = of_node_get(devnode);
	isa_bridge_pcidev = pdev;

	/* Now parse the "ranges" property and setup the ISA mapping */
	pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);

	/* Set the global ISA io base to indicate we have an ISA bridge */
	isa_io_base = ISA_IO_BASE;

	pr_debug("ISA bridge (late) is %pOF on %s\n",
		 devnode, pci_name(pdev));
}

/**
 * isa_bridge_remove - Remove/unmap an ISA bridge
 */
static void isa_bridge_remove(void)
{
	pr_debug("ISA bridge removed !\n");

	/* Clear the global ISA io base to indicate that we have no more
	 * ISA bridge. Note that drivers don't quite handle that, though
	 * we should probably do something about it. But do we ever really
	 * have ISA bridges being removed on machines using legacy devices ?
	 */
	isa_io_base = ISA_IO_BASE;

	/* Clear references to the bridge */
	of_node_put(isa_bridge_devnode);
	isa_bridge_devnode = NULL;
	isa_bridge_pcidev = NULL;

	/* Unmap the ISA area */
	__iounmap_at((void *)ISA_IO_BASE, 0x10000);
}

/**
 * isa_bridge_notify - Get notified of PCI devices addition/removal
 */
static int isa_bridge_notify(struct notifier_block *nb, unsigned long action,
			     void *data)
{
	struct device *dev = data;
	struct pci_dev *pdev = to_pci_dev(dev);
	struct device_node *devnode = pci_device_to_OF_node(pdev);

	switch(action) {
	case BUS_NOTIFY_ADD_DEVICE:
		/* Check if we have an early ISA device, without PCI dev */
		if (isa_bridge_devnode && isa_bridge_devnode == devnode &&
		    !isa_bridge_pcidev) {
			pr_debug("ISA bridge PCI attached: %s\n",
				 pci_name(pdev));
			isa_bridge_pcidev = pdev;
		}

		/* Check if we have no ISA device, and this happens to be one,
		 * register it as such if it has an OF device
		 */
		if (!isa_bridge_devnode && of_node_is_type(devnode, "isa"))
			isa_bridge_find_late(pdev, devnode);

		return 0;
	case BUS_NOTIFY_DEL_DEVICE:
		/* Check if this our existing ISA device */
		if (pdev == isa_bridge_pcidev ||
		    (devnode && devnode == isa_bridge_devnode))
			isa_bridge_remove();
		return 0;
	}
	return 0;
}

static struct notifier_block isa_bridge_notifier = {
	.notifier_call = isa_bridge_notify
};

/**
 * isa_bridge_init - register to be notified of ISA bridge addition/removal
 *
 */
static int __init isa_bridge_init(void)
{
	bus_register_notifier(&pci_bus_type, &isa_bridge_notifier);
	return 0;
}
arch_initcall(isa_bridge_init);
Commit	Line	Data
3d5134ee BH	1	/*
	2	* Routines for tracking a legacy ISA bridge
	3	*
	4	* Copyrigh 2007 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
	5	*
	6	* Some bits and pieces moved over from pci_64.c
	7	*
	8	* Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#define DEBUG
	17
	18	#include <linux/kernel.h>
	19	#include <linux/pci.h>
	20	#include <linux/string.h>
66b15db6	21	#include <linux/export.h>
3d5134ee BH	22	#include <linux/init.h>
	23	#include <linux/mm.h>
	24	#include <linux/notifier.h>
	25
	26	#include <asm/processor.h>
	27	#include <asm/io.h>
	28	#include <asm/prom.h>
	29	#include <asm/pci-bridge.h>
	30	#include <asm/machdep.h>
	31	#include <asm/ppc-pci.h>
38e9d36b	32	#include <asm/isa-bridge.h>
3d5134ee BH	33
	34	unsigned long isa_io_base; /* NULL if no ISA bus */
	35	EXPORT_SYMBOL(isa_io_base);
	36
	37	/* Cached ISA bridge dev. */
	38	static struct device_node *isa_bridge_devnode;
	39	struct pci_dev *isa_bridge_pcidev;
	40	EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
	41
	42	#define ISA_SPACE_MASK 0x1
	43	#define ISA_SPACE_IO 0x1
	44
cad5cef6 GKH	45	static void pci_process_ISA_OF_ranges(struct device_node *isa_node,
cad5cef6 GKH	46	unsigned long phb_io_base_phys)
3d5134ee BH	47	{
	48	/* We should get some saner parsing here and remove these structs */
	49	struct pci_address {
	50	u32 a_hi;
	51	u32 a_mid;
	52	u32 a_lo;
	53	};
	54
	55	struct isa_address {
	56	u32 a_hi;
	57	u32 a_lo;
	58	};
	59
	60	struct isa_range {
	61	struct isa_address isa_addr;
	62	struct pci_address pci_addr;
	63	unsigned int size;
	64	};
	65
	66	const struct isa_range *range;
	67	unsigned long pci_addr;
	68	unsigned int isa_addr;
	69	unsigned int size;
	70	int rlen = 0;
	71
	72	range = of_get_property(isa_node, "ranges", &rlen);
	73	if (range == NULL \|\| (rlen < sizeof(struct isa_range)))
	74	goto inval_range;
	75
	76	/* From "ISA Binding to 1275"
	77	* The ranges property is laid out as an array of elements,
	78	* each of which comprises:
	79	* cells 0 - 1: an ISA address
	80	* cells 2 - 4: a PCI address
	81	* (size depending on dev->n_addr_cells)
	82	* cell 5: the size of the range
	83	*/
4df4441e	84	if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO) {
3d5134ee BH	85	range++;
	86	rlen -= sizeof(struct isa_range);
	87	if (rlen < sizeof(struct isa_range))
	88	goto inval_range;
	89	}
4df4441e	90	if ((range->isa_addr.a_hi & ISA_SPACE_MASK) != ISA_SPACE_IO)
3d5134ee BH	91	goto inval_range;
	92
	93	isa_addr = range->isa_addr.a_lo;
	94	pci_addr = (unsigned long) range->pci_addr.a_mid << 32 \|
	95	range->pci_addr.a_lo;
	96
	97	/* Assume these are both zero. Note: We could fix that and
	98	* do a proper parsing instead ... oh well, that will do for
	99	* now as nobody uses fancy mappings for ISA bridges
	100	*/
	101	if ((pci_addr != 0) \|\| (isa_addr != 0)) {
	102	printk(KERN_ERR "unexpected isa to pci mapping: %s\n",
e48b1b45	103	__func__);
3d5134ee BH	104	return;
	105	}
	106
	107	/* Align size and make sure it's cropped to 64K */
	108	size = PAGE_ALIGN(range->size);
	109	if (size > 0x10000)
	110	size = 0x10000;
	111
3d5134ee	112	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
c766ee72	113	size, pgprot_noncached(PAGE_KERNEL));
3d5134ee BH	114	return;
	115
	116	inval_range:
df3c9019	117	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
3d5134ee BH	118	"mapping 64k\n");
3d5134ee BH	119	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
c766ee72	120	0x10000, pgprot_noncached(PAGE_KERNEL));
3d5134ee BH	121	}
	122
	123
	124	/**
	125	* isa_bridge_find_early - Find and map the ISA IO space early before
	126	* main PCI discovery. This is optionally called by
	127	* the arch code when adding PCI PHBs to get early
	128	* access to ISA IO ports
	129	*/
	130	void __init isa_bridge_find_early(struct pci_controller *hose)
	131	{
	132	struct device_node np, parent = NULL, *tmp;
	133
	134	/* If we already have an ISA bridge, bail off */
	135	if (isa_bridge_devnode != NULL)
	136	return;
	137
	138	/* For each "isa" node in the system. Note : we do a search by
	139	* type and not by name. It might be better to do by name but that's
	140	* what the code used to do and I don't want to break too much at
	141	* once. We can look into changing that separately
	142	*/
	143	for_each_node_by_type(np, "isa") {
	144	/* Look for our hose being a parent */
	145	for (parent = of_get_parent(np); parent;) {
44ef3390	146	if (parent == hose->dn) {
3d5134ee BH	147	of_node_put(parent);
	148	break;
	149	}
	150	tmp = parent;
	151	parent = of_get_parent(parent);
	152	of_node_put(tmp);
	153	}
	154	if (parent != NULL)
	155	break;
	156	}
	157	if (np == NULL)
	158	return;
	159	isa_bridge_devnode = np;
	160
	161	/* Now parse the "ranges" property and setup the ISA mapping */
	162	pci_process_ISA_OF_ranges(np, hose->io_base_phys);
	163
	164	/* Set the global ISA io base to indicate we have an ISA bridge */
	165	isa_io_base = ISA_IO_BASE;
	166
b7c670d6	167	pr_debug("ISA bridge (early) is %pOF\n", np);
3d5134ee BH	168	}
3d5134ee BH	169
b3c711a9 BH	170	/**
	171	* isa_bridge_find_early - Find and map the ISA IO space early before
	172	* main PCI discovery. This is optionally called by
	173	* the arch code when adding PCI PHBs to get early
	174	* access to ISA IO ports
	175	*/
	176	void __init isa_bridge_init_non_pci(struct device_node *np)
	177	{
	178	const __be32 ranges, pbasep = NULL;
	179	int rlen, i, rs;
	180	u32 na, ns, pna;
	181	u64 cbase, pbase, size = 0;
	182
	183	/* If we already have an ISA bridge, bail off */
	184	if (isa_bridge_devnode != NULL)
	185	return;
	186
	187	pna = of_n_addr_cells(np);
	188	if (of_property_read_u32(np, "#address-cells", &na) \|\|
	189	of_property_read_u32(np, "#size-cells", &ns)) {
b7c670d6 RH	190	pr_warn("ISA: Non-PCI bridge %pOF is missing address format\n",
b7c670d6 RH	191	np);
b3c711a9 BH	192	return;
	193	}
	194
	195	/* Check it's a supported address format */
	196	if (na != 2 \|\| ns != 1) {
b7c670d6 RH	197	pr_warn("ISA: Non-PCI bridge %pOF has unsupported address format\n",
b7c670d6 RH	198	np);
b3c711a9 BH	199	return;
	200	}
	201	rs = na + ns + pna;
	202
	203	/* Grab the ranges property */
	204	ranges = of_get_property(np, "ranges", &rlen);
	205	if (ranges == NULL \|\| rlen < rs) {
b7c670d6 RH	206	pr_warn("ISA: Non-PCI bridge %pOF has absent or invalid ranges\n",
b7c670d6 RH	207	np);
b3c711a9 BH	208	return;
	209	}
	210
	211	/* Parse it. We are only looking for IO space */
	212	for (i = 0; (i + rs - 1) < rlen; i += rs) {
	213	if (be32_to_cpup(ranges + i) != 1)
	214	continue;
	215	cbase = be32_to_cpup(ranges + i + 1);
	216	size = of_read_number(ranges + i + na + pna, ns);
	217	pbasep = ranges + i + na;
	218	break;
	219	}
	220
	221	/* Got something ? */
	222	if (!size \|\| !pbasep) {
b7c670d6 RH	223	pr_warn("ISA: Non-PCI bridge %pOF has no usable IO range\n",
b7c670d6 RH	224	np);
b3c711a9 BH	225	return;
	226	}
	227
	228	/* Align size and make sure it's cropped to 64K */
	229	size = PAGE_ALIGN(size);
	230	if (size > 0x10000)
	231	size = 0x10000;
	232
	233	/* Map pbase */
	234	pbase = of_translate_address(np, pbasep);
	235	if (pbase == OF_BAD_ADDR) {
b7c670d6 RH	236	pr_warn("ISA: Non-PCI bridge %pOF failed to translate IO base\n",
b7c670d6 RH	237	np);
b3c711a9 BH	238	return;
	239	}
	240
	241	/* We need page alignment */
	242	if ((cbase & ~PAGE_MASK) \|\| (pbase & ~PAGE_MASK)) {
b7c670d6 RH	243	pr_warn("ISA: Non-PCI bridge %pOF has non aligned IO range\n",
b7c670d6 RH	244	np);
b3c711a9 BH	245	return;
	246	}
	247
	248	/* Got it */
	249	isa_bridge_devnode = np;
	250
	251	/* Set the global ISA io base to indicate we have an ISA bridge
	252	* and map it
	253	*/
	254	isa_io_base = ISA_IO_BASE;
	255	__ioremap_at(pbase, (void *)ISA_IO_BASE,
c766ee72	256	size, pgprot_noncached(PAGE_KERNEL));
b3c711a9	257
b7c670d6	258	pr_debug("ISA: Non-PCI bridge is %pOF\n", np);
b3c711a9 BH	259	}
b3c711a9 BH	260
3d5134ee BH	261	/**
	262	* isa_bridge_find_late - Find and map the ISA IO space upon discovery of
	263	* a new ISA bridge
	264	*/
cad5cef6 GKH	265	static void isa_bridge_find_late(struct pci_dev *pdev,
cad5cef6 GKH	266	struct device_node *devnode)
3d5134ee BH	267	{
	268	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	269
	270	/* Store ISA device node and PCI device */
	271	isa_bridge_devnode = of_node_get(devnode);
	272	isa_bridge_pcidev = pdev;
	273
	274	/* Now parse the "ranges" property and setup the ISA mapping */
	275	pci_process_ISA_OF_ranges(devnode, hose->io_base_phys);
	276
	277	/* Set the global ISA io base to indicate we have an ISA bridge */
	278	isa_io_base = ISA_IO_BASE;
	279
b7c670d6 RH	280	pr_debug("ISA bridge (late) is %pOF on %s\n",
b7c670d6 RH	281	devnode, pci_name(pdev));
3d5134ee BH	282	}
	283
	284	/**
	285	* isa_bridge_remove - Remove/unmap an ISA bridge
	286	*/
	287	static void isa_bridge_remove(void)
	288	{
	289	pr_debug("ISA bridge removed !\n");
	290
	291	/* Clear the global ISA io base to indicate that we have no more
	292	* ISA bridge. Note that drivers don't quite handle that, though
	293	* we should probably do something about it. But do we ever really
	294	* have ISA bridges being removed on machines using legacy devices ?
	295	*/
	296	isa_io_base = ISA_IO_BASE;
	297
	298	/* Clear references to the bridge */
	299	of_node_put(isa_bridge_devnode);
	300	isa_bridge_devnode = NULL;
	301	isa_bridge_pcidev = NULL;
	302
	303	/* Unmap the ISA area */
	304	__iounmap_at((void *)ISA_IO_BASE, 0x10000);
	305	}
	306
	307	/**
	308	* isa_bridge_notify - Get notified of PCI devices addition/removal
	309	*/
cad5cef6 GKH	310	static int isa_bridge_notify(struct notifier_block *nb, unsigned long action,
cad5cef6 GKH	311	void *data)
3d5134ee BH	312	{
	313	struct device *dev = data;
	314	struct pci_dev *pdev = to_pci_dev(dev);
	315	struct device_node *devnode = pci_device_to_OF_node(pdev);
	316
	317	switch(action) {
	318	case BUS_NOTIFY_ADD_DEVICE:
	319	/* Check if we have an early ISA device, without PCI dev */
	320	if (isa_bridge_devnode && isa_bridge_devnode == devnode &&
	321	!isa_bridge_pcidev) {
	322	pr_debug("ISA bridge PCI attached: %s\n",
	323	pci_name(pdev));
	324	isa_bridge_pcidev = pdev;
	325	}
	326
	327	/* Check if we have no ISA device, and this happens to be one,
	328	* register it as such if it has an OF device
	329	*/
e5480bdc	330	if (!isa_bridge_devnode && of_node_is_type(devnode, "isa"))
3d5134ee BH	331	isa_bridge_find_late(pdev, devnode);
	332
	333	return 0;
	334	case BUS_NOTIFY_DEL_DEVICE:
	335	/* Check if this our existing ISA device */
	336	if (pdev == isa_bridge_pcidev \|\|
	337	(devnode && devnode == isa_bridge_devnode))
	338	isa_bridge_remove();
	339	return 0;
	340	}
	341	return 0;
	342	}
	343
	344	static struct notifier_block isa_bridge_notifier = {
	345	.notifier_call = isa_bridge_notify
	346	};
	347
	348	/**
	349	* isa_bridge_init - register to be notified of ISA bridge addition/removal
	350	*
	351	*/
	352	static int __init isa_bridge_init(void)
	353	{
3d5134ee BH	354	bus_register_notifier(&pci_bus_type, &isa_bridge_notifier);
	355	return 0;
	356	}
	357	arch_initcall(isa_bridge_init);