[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pci / bus.c

/*
 *	drivers/pci/bus.c
 *
 * From setup-res.c, by:
 *	Dave Rusling (david.rusling@reo.mts.dec.com)
 *	David Mosberger (davidm@cs.arizona.edu)
 *	David Miller (davem@redhat.com)
 *	Ivan Kokshaysky (ink@jurassic.park.msu.ru)
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/slab.h>

#include "pci.h"

void pci_add_resource_offset(struct list_head *resources, struct resource *res,
			     resource_size_t offset)
{
	struct pci_host_bridge_window *window;

	window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
	if (!window) {
		printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
		return;
	}

	window->res = res;
	window->offset = offset;
	list_add_tail(&window->list, resources);
}
EXPORT_SYMBOL(pci_add_resource_offset);

void pci_add_resource(struct list_head *resources, struct resource *res)
{
	pci_add_resource_offset(resources, res, 0);
}
EXPORT_SYMBOL(pci_add_resource);

void pci_free_resource_list(struct list_head *resources)
{
	struct pci_host_bridge_window *window, *tmp;

	list_for_each_entry_safe(window, tmp, resources, list) {
		list_del(&window->list);
		kfree(window);
	}
}
EXPORT_SYMBOL(pci_free_resource_list);

void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
			  unsigned int flags)
{
	struct pci_bus_resource *bus_res;

	bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
	if (!bus_res) {
		dev_err(&bus->dev, "can't add %pR resource\n", res);
		return;
	}

	bus_res->res = res;
	bus_res->flags = flags;
	list_add_tail(&bus_res->list, &bus->resources);
}

struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
{
	struct pci_bus_resource *bus_res;

	if (n < PCI_BRIDGE_RESOURCE_NUM)
		return bus->resource[n];

	n -= PCI_BRIDGE_RESOURCE_NUM;
	list_for_each_entry(bus_res, &bus->resources, list) {
		if (n-- == 0)
			return bus_res->res;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(pci_bus_resource_n);

void pci_bus_remove_resources(struct pci_bus *bus)
{
	int i;

	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
		bus->resource[i] = NULL;

	pci_free_resource_list(&bus->resources);
}

/**
 * pci_bus_alloc_resource - allocate a resource from a parent bus
 * @bus: PCI bus
 * @res: resource to allocate
 * @size: size of resource to allocate
 * @align: alignment of resource to allocate
 * @min: minimum /proc/iomem address to allocate
 * @type_mask: IORESOURCE_* type flags
 * @alignf: resource alignment function
 * @alignf_data: data argument for resource alignment function
 *
 * Given the PCI bus a device resides on, the size, minimum address,
 * alignment and type, try to find an acceptable resource allocation
 * for a specific device resource.
 */
int
pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
		resource_size_t size, resource_size_t align,
		resource_size_t min, unsigned int type_mask,
		resource_size_t (*alignf)(void *,
					  const struct resource *,
					  resource_size_t,
					  resource_size_t),
		void *alignf_data)
{
	int i, ret = -ENOMEM;
	struct resource *r;
	resource_size_t max = -1;

	type_mask |= IORESOURCE_IO | IORESOURCE_MEM;

	/* don't allocate too high if the pref mem doesn't support 64bit*/
	if (!(res->flags & IORESOURCE_MEM_64))
		max = PCIBIOS_MAX_MEM_32;

	pci_bus_for_each_resource(bus, r, i) {
		if (!r)
			continue;

		/* type_mask must match */
		if ((res->flags ^ r->flags) & type_mask)
			continue;

		/* We cannot allocate a non-prefetching resource
		   from a pre-fetching area */
		if ((r->flags & IORESOURCE_PREFETCH) &&
		    !(res->flags & IORESOURCE_PREFETCH))
			continue;

		/* Ok, try it out.. */
		ret = allocate_resource(r, res, size,
					r->start ? : min,
					max, align,
					alignf, alignf_data);
		if (ret == 0)
			break;
	}
	return ret;
}

/**
 * pci_bus_add_device - add a single device
 * @dev: device to add
 *
 * This adds a single pci device to the global
 * device list and adds sysfs and procfs entries
 */
int pci_bus_add_device(struct pci_dev *dev)
{
	int retval;
	retval = device_add(&dev->dev);
	if (retval)
		return retval;

	dev->is_added = 1;
	pci_proc_attach_device(dev);
	pci_create_sysfs_dev_files(dev);
	return 0;
}

/**
 * pci_bus_add_child - add a child bus
 * @bus: bus to add
 *
 * This adds sysfs entries for a single bus
 */
int pci_bus_add_child(struct pci_bus *bus)
{
	int retval;

	if (bus->bridge)
		bus->dev.parent = bus->bridge;

	retval = device_register(&bus->dev);
	if (retval)
		return retval;

	bus->is_added = 1;

	/* Create legacy_io and legacy_mem files for this bus */
	pci_create_legacy_files(bus);

	return retval;
}

/**
 * pci_bus_add_devices - insert newly discovered PCI devices
 * @bus: bus to check for new devices
 *
 * Add newly discovered PCI devices (which are on the bus->devices
 * list) to the global PCI device list, add the sysfs and procfs
 * entries.  Where a bridge is found, add the discovered bus to
 * the parents list of child buses, and recurse (breadth-first
 * to be compatible with 2.4)
 *
 * Call hotplug for each new devices.
 */
void pci_bus_add_devices(const struct pci_bus *bus)
{
	struct pci_dev *dev;
	struct pci_bus *child;
	int retval;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		/* Skip already-added devices */
		if (dev->is_added)
			continue;
		retval = pci_bus_add_device(dev);
		if (retval)
			dev_err(&dev->dev, "Error adding device, continuing\n");
	}

	list_for_each_entry(dev, &bus->devices, bus_list) {
		BUG_ON(!dev->is_added);

		child = dev->subordinate;
		/*
		 * If there is an unattached subordinate bus, attach
		 * it and then scan for unattached PCI devices.
		 */
		if (!child)
			continue;
		if (list_empty(&child->node)) {
			down_write(&pci_bus_sem);
			list_add_tail(&child->node, &dev->bus->children);
			up_write(&pci_bus_sem);
		}
		pci_bus_add_devices(child);

		/*
		 * register the bus with sysfs as the parent is now
		 * properly registered.
		 */
		if (child->is_added)
			continue;
		retval = pci_bus_add_child(child);
		if (retval)
			dev_err(&dev->dev, "Error adding bus, continuing\n");
	}
}

void pci_enable_bridges(struct pci_bus *bus)
{
	struct pci_dev *dev;
	int retval;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (dev->subordinate) {
			if (!pci_is_enabled(dev)) {
				retval = pci_enable_device(dev);
				if (retval)
					dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
				pci_set_master(dev);
			}
			pci_enable_bridges(dev->subordinate);
		}
	}
}

/** pci_walk_bus - walk devices on/under bus, calling callback.
 *  @top      bus whose devices should be walked
 *  @cb       callback to be called for each device found
 *  @userdata arbitrary pointer to be passed to callback.
 *
 *  Walk the given bus, including any bridged devices
 *  on buses under this bus.  Call the provided callback
 *  on each device found.
 *
 *  We check the return of @cb each time. If it returns anything
 *  other than 0, we break out.
 *
 */
void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
		  void *userdata)
{
	struct pci_dev *dev;
	struct pci_bus *bus;
	struct list_head *next;
	int retval;

	bus = top;
	down_read(&pci_bus_sem);
	next = top->devices.next;
	for (;;) {
		if (next == &bus->devices) {
			/* end of this bus, go up or finish */
			if (bus == top)
				break;
			next = bus->self->bus_list.next;
			bus = bus->self->bus;
			continue;
		}
		dev = list_entry(next, struct pci_dev, bus_list);
		if (dev->subordinate) {
			/* this is a pci-pci bridge, do its devices next */
			next = dev->subordinate->devices.next;
			bus = dev->subordinate;
		} else
			next = dev->bus_list.next;

		/* Run device routines with the device locked */
		device_lock(&dev->dev);
		retval = cb(dev, userdata);
		device_unlock(&dev->dev);
		if (retval)
			break;
	}
	up_read(&pci_bus_sem);
}
EXPORT_SYMBOL_GPL(pci_walk_bus);

EXPORT_SYMBOL(pci_bus_alloc_resource);
EXPORT_SYMBOL_GPL(pci_bus_add_device);
EXPORT_SYMBOL(pci_bus_add_devices);
EXPORT_SYMBOL(pci_enable_bridges);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/pci/bus.c
	3	*
	4	* From setup-res.c, by:
	5	* Dave Rusling (david.rusling@reo.mts.dec.com)
	6	* David Mosberger (davidm@cs.arizona.edu)
	7	* David Miller (davem@redhat.com)
	8	* Ivan Kokshaysky (ink@jurassic.park.msu.ru)
	9	*/
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/pci.h>
	13	#include <linux/errno.h>
	14	#include <linux/ioport.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/init.h>
5a0e3ad6	17	#include <linux/slab.h>
1da177e4 LT	18
	19	#include "pci.h"
	20
0efd5aab BH	21	void pci_add_resource_offset(struct list_head resources, struct resource res,
0efd5aab BH	22	resource_size_t offset)
45ca9e97	23	{
0efd5aab	24	struct pci_host_bridge_window *window;
45ca9e97	25
0efd5aab BH	26	window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
	27	if (!window) {
	28	printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
45ca9e97 BH	29	return;
	30	}
	31
0efd5aab BH	32	window->res = res;
	33	window->offset = offset;
	34	list_add_tail(&window->list, resources);
	35	}
	36	EXPORT_SYMBOL(pci_add_resource_offset);
	37
	38	void pci_add_resource(struct list_head resources, struct resource res)
	39	{
	40	pci_add_resource_offset(resources, res, 0);
45ca9e97 BH	41	}
	42	EXPORT_SYMBOL(pci_add_resource);
	43
	44	void pci_free_resource_list(struct list_head *resources)
	45	{
0efd5aab	46	struct pci_host_bridge_window window, tmp;
45ca9e97	47
0efd5aab BH	48	list_for_each_entry_safe(window, tmp, resources, list) {
	49	list_del(&window->list);
	50	kfree(window);
45ca9e97 BH	51	}
	52	}
	53	EXPORT_SYMBOL(pci_free_resource_list);
	54
2fe2abf8 BH	55	void pci_bus_add_resource(struct pci_bus bus, struct resource res,
	56	unsigned int flags)
	57	{
	58	struct pci_bus_resource *bus_res;
	59
	60	bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
	61	if (!bus_res) {
	62	dev_err(&bus->dev, "can't add %pR resource\n", res);
	63	return;
	64	}
	65
	66	bus_res->res = res;
	67	bus_res->flags = flags;
	68	list_add_tail(&bus_res->list, &bus->resources);
	69	}
	70
	71	struct resource pci_bus_resource_n(const struct pci_bus bus, int n)
	72	{
	73	struct pci_bus_resource *bus_res;
	74
	75	if (n < PCI_BRIDGE_RESOURCE_NUM)
	76	return bus->resource[n];
	77
	78	n -= PCI_BRIDGE_RESOURCE_NUM;
	79	list_for_each_entry(bus_res, &bus->resources, list) {
	80	if (n-- == 0)
	81	return bus_res->res;
	82	}
	83	return NULL;
	84	}
	85	EXPORT_SYMBOL_GPL(pci_bus_resource_n);
	86
	87	void pci_bus_remove_resources(struct pci_bus *bus)
	88	{
2fe2abf8 BH	89	int i;
	90
	91	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
7736a05a	92	bus->resource[i] = NULL;
2fe2abf8	93
45ca9e97	94	pci_free_resource_list(&bus->resources);
2fe2abf8 BH	95	}
2fe2abf8 BH	96
1da177e4 LT	97	/**
	98	* pci_bus_alloc_resource - allocate a resource from a parent bus
	99	* @bus: PCI bus
	100	* @res: resource to allocate
	101	* @size: size of resource to allocate
	102	* @align: alignment of resource to allocate
	103	* @min: minimum /proc/iomem address to allocate
	104	* @type_mask: IORESOURCE_* type flags
	105	* @alignf: resource alignment function
	106	* @alignf_data: data argument for resource alignment function
	107	*
	108	* Given the PCI bus a device resides on, the size, minimum address,
	109	* alignment and type, try to find an acceptable resource allocation
	110	* for a specific device resource.
	111	*/
	112	int
	113	pci_bus_alloc_resource(struct pci_bus bus, struct resource res,
e31dd6e4 GKH	114	resource_size_t size, resource_size_t align,
e31dd6e4 GKH	115	resource_size_t min, unsigned int type_mask,
b26b2d49	116	resource_size_t (alignf)(void ,
3b7a17fc	117	const struct resource *,
b26b2d49 DB	118	resource_size_t,
b26b2d49 DB	119	resource_size_t),
e31dd6e4	120	void *alignf_data)
1da177e4	121	{
6db45b76	122	int i, ret = -ENOMEM;
89a74ecc	123	struct resource *r;
1f82de10	124	resource_size_t max = -1;
1da177e4 LT	125
	126	type_mask \|= IORESOURCE_IO \| IORESOURCE_MEM;
	127
1f82de10 YL	128	/* don't allocate too high if the pref mem doesn't support 64bit*/
	129	if (!(res->flags & IORESOURCE_MEM_64))
	130	max = PCIBIOS_MAX_MEM_32;
	131
6db45b76 BH	132	pci_bus_for_each_resource(bus, r, i) {
	133	if (!r)
	134	continue;
	135
1da177e4 LT	136	/* type_mask must match */
	137	if ((res->flags ^ r->flags) & type_mask)
	138	continue;
	139
	140	/* We cannot allocate a non-prefetching resource
	141	from a pre-fetching area */
	142	if ((r->flags & IORESOURCE_PREFETCH) &&
	143	!(res->flags & IORESOURCE_PREFETCH))
	144	continue;
	145
	146	/* Ok, try it out.. */
688d1918 LT	147	ret = allocate_resource(r, res, size,
688d1918 LT	148	r->start ? : min,
1f82de10	149	max, align,
1da177e4 LT	150	alignf, alignf_data);
	151	if (ret == 0)
	152	break;
	153	}
	154	return ret;
	155	}
	156
	157	/**
3fa16fdb	158	* pci_bus_add_device - add a single device
1da177e4 LT	159	* @dev: device to add
	160	*
	161	* This adds a single pci device to the global
	162	* device list and adds sysfs and procfs entries
	163	*/
96bde06a	164	int pci_bus_add_device(struct pci_dev *dev)
1da177e4	165	{
b19441af GKH	166	int retval;
	167	retval = device_add(&dev->dev);
	168	if (retval)
	169	return retval;
1da177e4	170
8a1bc901	171	dev->is_added = 1;
1da177e4 LT	172	pci_proc_attach_device(dev);
1da177e4 LT	173	pci_create_sysfs_dev_files(dev);
b19441af	174	return 0;
1da177e4 LT	175	}
1da177e4 LT	176
876e501a YZ	177	/**
	178	* pci_bus_add_child - add a child bus
	179	* @bus: bus to add
	180	*
	181	* This adds sysfs entries for a single bus
	182	*/
	183	int pci_bus_add_child(struct pci_bus *bus)
	184	{
	185	int retval;
	186
	187	if (bus->bridge)
	188	bus->dev.parent = bus->bridge;
	189
	190	retval = device_register(&bus->dev);
	191	if (retval)
	192	return retval;
	193
	194	bus->is_added = 1;
	195
876e501a YZ	196	/* Create legacy_io and legacy_mem files for this bus */
	197	pci_create_legacy_files(bus);
	198
	199	return retval;
	200	}
	201
1da177e4 LT	202	/**
	203	* pci_bus_add_devices - insert newly discovered PCI devices
	204	* @bus: bus to check for new devices
	205	*
	206	* Add newly discovered PCI devices (which are on the bus->devices
	207	* list) to the global PCI device list, add the sysfs and procfs
	208	* entries. Where a bridge is found, add the discovered bus to
	209	* the parents list of child buses, and recurse (breadth-first
	210	* to be compatible with 2.4)
	211	*
	212	* Call hotplug for each new devices.
	213	*/
c48f1670	214	void pci_bus_add_devices(const struct pci_bus *bus)
1da177e4 LT	215	{
1da177e4 LT	216	struct pci_dev *dev;
3fa16fdb	217	struct pci_bus *child;
b19441af	218	int retval;
1da177e4 LT	219
1da177e4 LT	220	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901 GKH	221	/* Skip already-added devices */
8a1bc901 GKH	222	if (dev->is_added)
1da177e4	223	continue;
b19441af GKH	224	retval = pci_bus_add_device(dev);
	225	if (retval)
	226	dev_err(&dev->dev, "Error adding device, continuing\n");
1da177e4 LT	227	}
	228
	229	list_for_each_entry(dev, &bus->devices, bus_list) {
8a1bc901	230	BUG_ON(!dev->is_added);
1da177e4	231
3fa16fdb	232	child = dev->subordinate;
1da177e4 LT	233	/*
	234	* If there is an unattached subordinate bus, attach
	235	* it and then scan for unattached PCI devices.
	236	*/
3fa16fdb YZ	237	if (!child)
	238	continue;
	239	if (list_empty(&child->node)) {
	240	down_write(&pci_bus_sem);
	241	list_add_tail(&child->node, &dev->bus->children);
	242	up_write(&pci_bus_sem);
	243	}
	244	pci_bus_add_devices(child);
	245
	246	/*
	247	* register the bus with sysfs as the parent is now
	248	* properly registered.
	249	*/
	250	if (child->is_added)
	251	continue;
876e501a	252	retval = pci_bus_add_child(child);
3fa16fdb	253	if (retval)
876e501a	254	dev_err(&dev->dev, "Error adding bus, continuing\n");
1da177e4 LT	255	}
	256	}
	257
	258	void pci_enable_bridges(struct pci_bus *bus)
	259	{
	260	struct pci_dev *dev;
95a62965	261	int retval;
1da177e4 LT	262
	263	list_for_each_entry(dev, &bus->devices, bus_list) {
	264	if (dev->subordinate) {
296ccb08	265	if (!pci_is_enabled(dev)) {
9dd90caf	266	retval = pci_enable_device(dev);
2eb5ebd3 JW	267	if (retval)
2eb5ebd3 JW	268	dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
9dd90caf AC	269	pci_set_master(dev);
9dd90caf AC	270	}
1da177e4 LT	271	pci_enable_bridges(dev->subordinate);
	272	}
	273	}
	274	}
	275
cecf4864 PM	276	/** pci_walk_bus - walk devices on/under bus, calling callback.
	277	* @top bus whose devices should be walked
	278	* @cb callback to be called for each device found
	279	* @userdata arbitrary pointer to be passed to callback.
	280	*
	281	* Walk the given bus, including any bridged devices
	282	* on buses under this bus. Call the provided callback
	283	* on each device found.
70298c6e ZY	284	*
	285	* We check the return of @cb each time. If it returns anything
	286	* other than 0, we break out.
	287	*
cecf4864	288	*/
70298c6e	289	void pci_walk_bus(struct pci_bus top, int (cb)(struct pci_dev , void ),
cecf4864 PM	290	void *userdata)
	291	{
	292	struct pci_dev *dev;
	293	struct pci_bus *bus;
	294	struct list_head *next;
70298c6e	295	int retval;
cecf4864 PM	296
cecf4864 PM	297	bus = top;
d71374da	298	down_read(&pci_bus_sem);
cecf4864 PM	299	next = top->devices.next;
	300	for (;;) {
	301	if (next == &bus->devices) {
	302	/* end of this bus, go up or finish */
	303	if (bus == top)
	304	break;
	305	next = bus->self->bus_list.next;
	306	bus = bus->self->bus;
	307	continue;
	308	}
	309	dev = list_entry(next, struct pci_dev, bus_list);
cecf4864 PM	310	if (dev->subordinate) {
	311	/* this is a pci-pci bridge, do its devices next */
	312	next = dev->subordinate->devices.next;
	313	bus = dev->subordinate;
	314	} else
	315	next = dev->bus_list.next;
cecf4864	316
d71374da	317	/* Run device routines with the device locked */
8e9394ce	318	device_lock(&dev->dev);
70298c6e	319	retval = cb(dev, userdata);
8e9394ce	320	device_unlock(&dev->dev);
70298c6e ZY	321	if (retval)
70298c6e ZY	322	break;
cecf4864	323	}
d71374da	324	up_read(&pci_bus_sem);
cecf4864	325	}
7c94def8	326	EXPORT_SYMBOL_GPL(pci_walk_bus);
cecf4864	327
1da177e4 LT	328	EXPORT_SYMBOL(pci_bus_alloc_resource);
	329	EXPORT_SYMBOL_GPL(pci_bus_add_device);
	330	EXPORT_SYMBOL(pci_bus_add_devices);
	331	EXPORT_SYMBOL(pci_enable_bridges);