[linux-2.6-block.git] / arch / x86 / pci / i386.c

/*
 *	Low-Level PCI Access for i386 machines
 *
 * Copyright 1993, 1994 Drew Eckhardt
 *      Visionary Computing
 *      (Unix and Linux consulting and custom programming)
 *      Drew@Colorado.EDU
 *      +1 (303) 786-7975
 *
 * Drew's work was sponsored by:
 *	iX Multiuser Multitasking Magazine
 *	Hannover, Germany
 *	hm@ix.de
 *
 * Copyright 1997--2000 Martin Mares <mj@ucw.cz>
 *
 * For more information, please consult the following manuals (look at
 * http://www.pcisig.com/ for how to get them):
 *
 * PCI BIOS Specification
 * PCI Local Bus Specification
 * PCI to PCI Bridge Specification
 * PCI System Design Guide
 *
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/bootmem.h>

#include <asm/pat.h>
#include <asm/e820.h>
#include <asm/pci_x86.h>
#include <asm/io_apic.h>


/*
 * This list of dynamic mappings is for temporarily maintaining
 * original BIOS BAR addresses for possible reinstatement.
 */
struct pcibios_fwaddrmap {
	struct list_head list;
	struct pci_dev *dev;
	resource_size_t fw_addr[DEVICE_COUNT_RESOURCE];
};

static LIST_HEAD(pcibios_fwaddrmappings);
static DEFINE_SPINLOCK(pcibios_fwaddrmap_lock);
static bool pcibios_fw_addr_done;

/* Must be called with 'pcibios_fwaddrmap_lock' lock held. */
static struct pcibios_fwaddrmap *pcibios_fwaddrmap_lookup(struct pci_dev *dev)
{
	struct pcibios_fwaddrmap *map;

	WARN_ON_SMP(!spin_is_locked(&pcibios_fwaddrmap_lock));

	list_for_each_entry(map, &pcibios_fwaddrmappings, list)
		if (map->dev == dev)
			return map;

	return NULL;
}

static void
pcibios_save_fw_addr(struct pci_dev *dev, int idx, resource_size_t fw_addr)
{
	unsigned long flags;
	struct pcibios_fwaddrmap *map;

	if (pcibios_fw_addr_done)
		return;

	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	map = pcibios_fwaddrmap_lookup(dev);
	if (!map) {
		spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
		map = kzalloc(sizeof(*map), GFP_KERNEL);
		if (!map)
			return;

		map->dev = pci_dev_get(dev);
		map->fw_addr[idx] = fw_addr;
		INIT_LIST_HEAD(&map->list);

		spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
		list_add_tail(&map->list, &pcibios_fwaddrmappings);
	} else
		map->fw_addr[idx] = fw_addr;
	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
}

resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
{
	unsigned long flags;
	struct pcibios_fwaddrmap *map;
	resource_size_t fw_addr = 0;

	if (pcibios_fw_addr_done)
		return 0;

	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	map = pcibios_fwaddrmap_lookup(dev);
	if (map)
		fw_addr = map->fw_addr[idx];
	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);

	return fw_addr;
}

static void __init pcibios_fw_addr_list_del(void)
{
	unsigned long flags;
	struct pcibios_fwaddrmap *entry, *next;

	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	list_for_each_entry_safe(entry, next, &pcibios_fwaddrmappings, list) {
		list_del(&entry->list);
		pci_dev_put(entry->dev);
		kfree(entry);
	}
	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
	pcibios_fw_addr_done = true;
}

static int
skip_isa_ioresource_align(struct pci_dev *dev) {

	if ((pci_probe & PCI_CAN_SKIP_ISA_ALIGN) &&
	    !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
		return 1;
	return 0;
}

/*
 * We need to avoid collisions with `mirrored' VGA ports
 * and other strange ISA hardware, so we always want the
 * addresses to be allocated in the 0x000-0x0ff region
 * modulo 0x400.
 *
 * Why? Because some silly external IO cards only decode
 * the low 10 bits of the IO address. The 0x00-0xff region
 * is reserved for motherboard devices that decode all 16
 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
 * but we want to try to avoid allocating at 0x2900-0x2bff
 * which might have be mirrored at 0x0100-0x03ff..
 */
resource_size_t
pcibios_align_resource(void *data, const struct resource *res,
			resource_size_t size, resource_size_t align)
{
	struct pci_dev *dev = data;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
		if (skip_isa_ioresource_align(dev))
			return start;
		if (start & 0x300)
			start = (start + 0x3ff) & ~0x3ff;
	}
	return start;
}
EXPORT_SYMBOL(pcibios_align_resource);

/*
 *  Handle resources of PCI devices.  If the world were perfect, we could
 *  just allocate all the resource regions and do nothing more.  It isn't.
 *  On the other hand, we cannot just re-allocate all devices, as it would
 *  require us to know lots of host bridge internals.  So we attempt to
 *  keep as much of the original configuration as possible, but tweak it
 *  when it's found to be wrong.
 *
 *  Known BIOS problems we have to work around:
 *	- I/O or memory regions not configured
 *	- regions configured, but not enabled in the command register
 *	- bogus I/O addresses above 64K used
 *	- expansion ROMs left enabled (this may sound harmless, but given
 *	  the fact the PCI specs explicitly allow address decoders to be
 *	  shared between expansion ROMs and other resource regions, it's
 *	  at least dangerous)
 *	- bad resource sizes or overlaps with other regions
 *
 *  Our solution:
 *	(1) Allocate resources for all buses behind PCI-to-PCI bridges.
 *	    This gives us fixed barriers on where we can allocate.
 *	(2) Allocate resources for all enabled devices.  If there is
 *	    a collision, just mark the resource as unallocated. Also
 *	    disable expansion ROMs during this step.
 *	(3) Try to allocate resources for disabled devices.  If the
 *	    resources were assigned correctly, everything goes well,
 *	    if they weren't, they won't disturb allocation of other
 *	    resources.
 *	(4) Assign new addresses to resources which were either
 *	    not configured at all or misconfigured.  If explicitly
 *	    requested by the user, configure expansion ROM address
 *	    as well.
 */

static void pcibios_allocate_bridge_resources(struct pci_dev *dev)
{
	int idx;
	struct resource *r;

	for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
		r = &dev->resource[idx];
		if (!r->flags)
			continue;
		if (r->parent)	/* Already allocated */
			continue;
		if (!r->start || pci_claim_resource(dev, idx) < 0) {
			/*
			 * Something is wrong with the region.
			 * Invalidate the resource to prevent
			 * child resource allocations in this
			 * range.
			 */
			r->start = r->end = 0;
			r->flags = 0;
		}
	}
}

static void pcibios_allocate_bus_resources(struct pci_bus *bus)
{
	struct pci_bus *child;

	/* Depth-First Search on bus tree */
	if (bus->self)
		pcibios_allocate_bridge_resources(bus->self);
	list_for_each_entry(child, &bus->children, node)
		pcibios_allocate_bus_resources(child);
}

struct pci_check_idx_range {
	int start;
	int end;
};

static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
{
	int idx, disabled, i;
	u16 command;
	struct resource *r;

	struct pci_check_idx_range idx_range[] = {
		{ PCI_STD_RESOURCES, PCI_STD_RESOURCE_END },
#ifdef CONFIG_PCI_IOV
		{ PCI_IOV_RESOURCES, PCI_IOV_RESOURCE_END },
#endif
	};

	pci_read_config_word(dev, PCI_COMMAND, &command);
	for (i = 0; i < ARRAY_SIZE(idx_range); i++)
		for (idx = idx_range[i].start; idx <= idx_range[i].end; idx++) {
			r = &dev->resource[idx];
			if (r->parent)	/* Already allocated */
				continue;
			if (!r->start)	/* Address not assigned at all */
				continue;
			if (r->flags & IORESOURCE_IO)
				disabled = !(command & PCI_COMMAND_IO);
			else
				disabled = !(command & PCI_COMMAND_MEMORY);
			if (pass == disabled) {
				dev_dbg(&dev->dev,
					"BAR %d: reserving %pr (d=%d, p=%d)\n",
					idx, r, disabled, pass);
				if (pci_claim_resource(dev, idx) < 0) {
					if (r->flags & IORESOURCE_PCI_FIXED) {
						dev_info(&dev->dev, "BAR %d %pR is immovable\n",
							 idx, r);
					} else {
						/* We'll assign a new address later */
						pcibios_save_fw_addr(dev,
								idx, r->start);
						r->end -= r->start;
						r->start = 0;
					}
				}
			}
		}
	if (!pass) {
		r = &dev->resource[PCI_ROM_RESOURCE];
		if (r->flags & IORESOURCE_ROM_ENABLE) {
			/* Turn the ROM off, leave the resource region,
			 * but keep it unregistered. */
			u32 reg;
			dev_dbg(&dev->dev, "disabling ROM %pR\n", r);
			r->flags &= ~IORESOURCE_ROM_ENABLE;
			pci_read_config_dword(dev, dev->rom_base_reg, &reg);
			pci_write_config_dword(dev, dev->rom_base_reg,
						reg & ~PCI_ROM_ADDRESS_ENABLE);
		}
	}
}

static void pcibios_allocate_resources(struct pci_bus *bus, int pass)
{
	struct pci_dev *dev;
	struct pci_bus *child;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		pcibios_allocate_dev_resources(dev, pass);

		child = dev->subordinate;
		if (child)
			pcibios_allocate_resources(child, pass);
	}
}

static void pcibios_allocate_dev_rom_resource(struct pci_dev *dev)
{
	struct resource *r;

	/*
	 * Try to use BIOS settings for ROMs, otherwise let
	 * pci_assign_unassigned_resources() allocate the new
	 * addresses.
	 */
	r = &dev->resource[PCI_ROM_RESOURCE];
	if (!r->flags || !r->start)
		return;
	if (r->parent) /* Already allocated */
		return;

	if (pci_claim_resource(dev, PCI_ROM_RESOURCE) < 0) {
		r->end -= r->start;
		r->start = 0;
	}
}
static void pcibios_allocate_rom_resources(struct pci_bus *bus)
{
	struct pci_dev *dev;
	struct pci_bus *child;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		pcibios_allocate_dev_rom_resource(dev);

		child = dev->subordinate;
		if (child)
			pcibios_allocate_rom_resources(child);
	}
}

static int __init pcibios_assign_resources(void)
{
	struct pci_bus *bus;

	if (!(pci_probe & PCI_ASSIGN_ROMS))
		list_for_each_entry(bus, &pci_root_buses, node)
			pcibios_allocate_rom_resources(bus);

	pci_assign_unassigned_resources();
	pcibios_fw_addr_list_del();

	return 0;
}

void pcibios_resource_survey_bus(struct pci_bus *bus)
{
	dev_printk(KERN_DEBUG, &bus->dev, "Allocating resources\n");

	pcibios_allocate_bus_resources(bus);

	pcibios_allocate_resources(bus, 0);
	pcibios_allocate_resources(bus, 1);

	if (!(pci_probe & PCI_ASSIGN_ROMS))
		pcibios_allocate_rom_resources(bus);
}

void __init pcibios_resource_survey(void)
{
	struct pci_bus *bus;

	DBG("PCI: Allocating resources\n");

	list_for_each_entry(bus, &pci_root_buses, node)
		pcibios_allocate_bus_resources(bus);

	list_for_each_entry(bus, &pci_root_buses, node)
		pcibios_allocate_resources(bus, 0);
	list_for_each_entry(bus, &pci_root_buses, node)
		pcibios_allocate_resources(bus, 1);

	e820_reserve_resources_late();
	/*
	 * Insert the IO APIC resources after PCI initialization has
	 * occurred to handle IO APICS that are mapped in on a BAR in
	 * PCI space, but before trying to assign unassigned pci res.
	 */
	ioapic_insert_resources();
}

/**
 * called in fs_initcall (one below subsys_initcall),
 * give a chance for motherboard reserve resources
 */
fs_initcall(pcibios_assign_resources);

static const struct vm_operations_struct pci_mmap_ops = {
	.access = generic_access_phys,
};

int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
			enum pci_mmap_state mmap_state, int write_combine)
{
	unsigned long prot;

	/* I/O space cannot be accessed via normal processor loads and
	 * stores on this platform.
	 */
	if (mmap_state == pci_mmap_io)
		return -EINVAL;

	prot = pgprot_val(vma->vm_page_prot);

	/*
 	 * Return error if pat is not enabled and write_combine is requested.
 	 * Caller can followup with UC MINUS request and add a WC mtrr if there
 	 * is a free mtrr slot.
 	 */
	if (!pat_enabled && write_combine)
		return -EINVAL;

	if (pat_enabled && write_combine)
		prot |= _PAGE_CACHE_WC;
	else if (pat_enabled || boot_cpu_data.x86 > 3)
		/*
		 * ioremap() and ioremap_nocache() defaults to UC MINUS for now.
		 * To avoid attribute conflicts, request UC MINUS here
		 * as well.
		 */
		prot |= _PAGE_CACHE_UC_MINUS;

	prot |= _PAGE_IOMAP;	/* creating a mapping for IO */

	vma->vm_page_prot = __pgprot(prot);

	if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
			       vma->vm_end - vma->vm_start,
			       vma->vm_page_prot))
		return -EAGAIN;

	vma->vm_ops = &pci_mmap_ops;

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Low-Level PCI Access for i386 machines
	3	*
	4	* Copyright 1993, 1994 Drew Eckhardt
	5	* Visionary Computing
	6	* (Unix and Linux consulting and custom programming)
	7	* Drew@Colorado.EDU
	8	* +1 (303) 786-7975
	9	*
	10	* Drew's work was sponsored by:
	11	* iX Multiuser Multitasking Magazine
	12	* Hannover, Germany
	13	* hm@ix.de
	14	*
	15	* Copyright 1997--2000 Martin Mares <mj@ucw.cz>
	16	*
	17	* For more information, please consult the following manuals (look at
	18	* http://www.pcisig.com/ for how to get them):
	19	*
	20	* PCI BIOS Specification
	21	* PCI Local Bus Specification
	22	* PCI to PCI Bridge Specification
	23	* PCI System Design Guide
	24	*
	25	*/
	26
	27	#include <linux/types.h>
	28	#include <linux/kernel.h>
69c60c88	29	#include <linux/export.h>
1da177e4 LT	30	#include <linux/pci.h>
	31	#include <linux/init.h>
	32	#include <linux/ioport.h>
	33	#include <linux/errno.h>
03d72aa1	34	#include <linux/bootmem.h>
	35
	36	#include <asm/pat.h>
58f7c988	37	#include <asm/e820.h>
82487711	38	#include <asm/pci_x86.h>
857fdc53	39	#include <asm/io_apic.h>
1da177e4	40
1da177e4	41
925845bd MS	42	/*
	43	* This list of dynamic mappings is for temporarily maintaining
	44	* original BIOS BAR addresses for possible reinstatement.
	45	*/
	46	struct pcibios_fwaddrmap {
	47	struct list_head list;
	48	struct pci_dev *dev;
	49	resource_size_t fw_addr[DEVICE_COUNT_RESOURCE];
	50	};
	51
	52	static LIST_HEAD(pcibios_fwaddrmappings);
	53	static DEFINE_SPINLOCK(pcibios_fwaddrmap_lock);
74521602	54	static bool pcibios_fw_addr_done;
925845bd MS	55
	56	/* Must be called with 'pcibios_fwaddrmap_lock' lock held. */
	57	static struct pcibios_fwaddrmap pcibios_fwaddrmap_lookup(struct pci_dev dev)
	58	{
	59	struct pcibios_fwaddrmap *map;
	60
867aae6e	61	WARN_ON_SMP(!spin_is_locked(&pcibios_fwaddrmap_lock));
63ab387c	62
925845bd MS	63	list_for_each_entry(map, &pcibios_fwaddrmappings, list)
	64	if (map->dev == dev)
	65	return map;
	66
	67	return NULL;
	68	}
	69
	70	static void
	71	pcibios_save_fw_addr(struct pci_dev *dev, int idx, resource_size_t fw_addr)
	72	{
	73	unsigned long flags;
	74	struct pcibios_fwaddrmap *map;
	75
74521602 YL	76	if (pcibios_fw_addr_done)
	77	return;
	78
925845bd MS	79	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	80	map = pcibios_fwaddrmap_lookup(dev);
	81	if (!map) {
	82	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
	83	map = kzalloc(sizeof(*map), GFP_KERNEL);
	84	if (!map)
	85	return;
	86
	87	map->dev = pci_dev_get(dev);
	88	map->fw_addr[idx] = fw_addr;
	89	INIT_LIST_HEAD(&map->list);
	90
	91	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	92	list_add_tail(&map->list, &pcibios_fwaddrmappings);
	93	} else
	94	map->fw_addr[idx] = fw_addr;
	95	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
	96	}
	97
	98	resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
	99	{
	100	unsigned long flags;
	101	struct pcibios_fwaddrmap *map;
	102	resource_size_t fw_addr = 0;
	103
74521602 YL	104	if (pcibios_fw_addr_done)
	105	return 0;
	106
925845bd MS	107	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	108	map = pcibios_fwaddrmap_lookup(dev);
	109	if (map)
	110	fw_addr = map->fw_addr[idx];
	111	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
	112
	113	return fw_addr;
	114	}
	115
74521602	116	static void __init pcibios_fw_addr_list_del(void)
925845bd MS	117	{
	118	unsigned long flags;
	119	struct pcibios_fwaddrmap entry, next;
	120
	121	spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
	122	list_for_each_entry_safe(entry, next, &pcibios_fwaddrmappings, list) {
	123	list_del(&entry->list);
	124	pci_dev_put(entry->dev);
	125	kfree(entry);
	126	}
	127	spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
74521602	128	pcibios_fw_addr_done = true;
925845bd MS	129	}
925845bd MS	130
036fff4c GH	131	static int
	132	skip_isa_ioresource_align(struct pci_dev *dev) {
	133
	134	if ((pci_probe & PCI_CAN_SKIP_ISA_ALIGN) &&
11949255	135	!(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
036fff4c GH	136	return 1;
	137	return 0;
	138	}
	139
1da177e4 LT	140	/*
	141	* We need to avoid collisions with `mirrored' VGA ports
	142	* and other strange ISA hardware, so we always want the
	143	* addresses to be allocated in the 0x000-0x0ff region
	144	* modulo 0x400.
	145	*
	146	* Why? Because some silly external IO cards only decode
	147	* the low 10 bits of the IO address. The 0x00-0xff region
	148	* is reserved for motherboard devices that decode all 16
	149	* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
	150	* but we want to try to avoid allocating at 0x2900-0x2bff
	151	* which might have be mirrored at 0x0100-0x03ff..
	152	*/
b26b2d49	153	resource_size_t
3b7a17fc	154	pcibios_align_resource(void data, const struct resource res,
e31dd6e4	155	resource_size_t size, resource_size_t align)
1da177e4	156	{
036fff4c	157	struct pci_dev *dev = data;
d14125ec	158	resource_size_t start = res->start;
036fff4c	159
1da177e4	160	if (res->flags & IORESOURCE_IO) {
d14125ec BH	161	if (skip_isa_ioresource_align(dev))
	162	return start;
	163	if (start & 0x300)
	164	start = (start + 0x3ff) & ~0x3ff;
1da177e4	165	}
b26b2d49	166	return start;
1da177e4	167	}
6c00a61e	168	EXPORT_SYMBOL(pcibios_align_resource);
1da177e4 LT	169
	170	/*
	171	* Handle resources of PCI devices. If the world were perfect, we could
	172	* just allocate all the resource regions and do nothing more. It isn't.
	173	* On the other hand, we cannot just re-allocate all devices, as it would
	174	* require us to know lots of host bridge internals. So we attempt to
	175	* keep as much of the original configuration as possible, but tweak it
	176	* when it's found to be wrong.
	177	*
	178	* Known BIOS problems we have to work around:
	179	* - I/O or memory regions not configured
	180	* - regions configured, but not enabled in the command register
	181	* - bogus I/O addresses above 64K used
	182	* - expansion ROMs left enabled (this may sound harmless, but given
	183	* the fact the PCI specs explicitly allow address decoders to be
	184	* shared between expansion ROMs and other resource regions, it's
	185	* at least dangerous)
837c4ef1	186	* - bad resource sizes or overlaps with other regions
1da177e4 LT	187	*
	188	* Our solution:
	189	* (1) Allocate resources for all buses behind PCI-to-PCI bridges.
	190	* This gives us fixed barriers on where we can allocate.
	191	* (2) Allocate resources for all enabled devices. If there is
	192	* a collision, just mark the resource as unallocated. Also
	193	* disable expansion ROMs during this step.
	194	* (3) Try to allocate resources for disabled devices. If the
	195	* resources were assigned correctly, everything goes well,
	196	* if they weren't, they won't disturb allocation of other
	197	* resources.
	198	* (4) Assign new addresses to resources which were either
	199	* not configured at all or misconfigured. If explicitly
	200	* requested by the user, configure expansion ROM address
	201	* as well.
	202	*/
	203
b95168e0	204	static void pcibios_allocate_bridge_resources(struct pci_dev *dev)
1da177e4	205	{
1da177e4	206	int idx;
a76117df	207	struct resource *r;
1da177e4	208
f7ac356d YL	209	for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
	210	r = &dev->resource[idx];
	211	if (!r->flags)
	212	continue;
c70d6505 MW	213	if (r->parent) /* Already allocated */
c70d6505 MW	214	continue;
f7ac356d YL	215	if (!r->start \|\| pci_claim_resource(dev, idx) < 0) {
	216	/*
	217	* Something is wrong with the region.
	218	* Invalidate the resource to prevent
	219	* child resource allocations in this
	220	* range.
	221	*/
	222	r->start = r->end = 0;
	223	r->flags = 0;
	224	}
	225	}
	226	}
	227
b95168e0	228	static void pcibios_allocate_bus_resources(struct pci_bus *bus)
f7ac356d	229	{
83edc87c	230	struct pci_bus *child;
f7ac356d	231
1da177e4	232	/* Depth-First Search on bus tree */
83edc87c YL	233	if (bus->self)
	234	pcibios_allocate_bridge_resources(bus->self);
	235	list_for_each_entry(child, &bus->children, node)
	236	pcibios_allocate_bus_resources(child);
1da177e4 LT	237	}
1da177e4 LT	238
575939cf YL	239	struct pci_check_idx_range {
	240	int start;
	241	int end;
	242	};
	243
b95168e0	244	static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
1da177e4	245	{
575939cf	246	int idx, disabled, i;
1da177e4	247	u16 command;
a76117df	248	struct resource *r;
1da177e4	249
575939cf YL	250	struct pci_check_idx_range idx_range[] = {
	251	{ PCI_STD_RESOURCES, PCI_STD_RESOURCE_END },
	252	#ifdef CONFIG_PCI_IOV
	253	{ PCI_IOV_RESOURCES, PCI_IOV_RESOURCE_END },
	254	#endif
	255	};
	256
c7f4bbc9 YL	257	pci_read_config_word(dev, PCI_COMMAND, &command);
c7f4bbc9 YL	258	for (i = 0; i < ARRAY_SIZE(idx_range); i++)
575939cf	259	for (idx = idx_range[i].start; idx <= idx_range[i].end; idx++) {
1da177e4	260	r = &dev->resource[idx];
c7f4bbc9	261	if (r->parent) /* Already allocated */
1da177e4	262	continue;
c7f4bbc9	263	if (!r->start) /* Address not assigned at all */
1da177e4 LT	264	continue;
	265	if (r->flags & IORESOURCE_IO)
	266	disabled = !(command & PCI_COMMAND_IO);
	267	else
	268	disabled = !(command & PCI_COMMAND_MEMORY);
	269	if (pass == disabled) {
c7dabef8	270	dev_dbg(&dev->dev,
865df576	271	"BAR %d: reserving %pr (d=%d, p=%d)\n",
c7dabef8	272	idx, r, disabled, pass);
a76117df	273	if (pci_claim_resource(dev, idx) < 0) {
4e4ba944 BH	274	if (r->flags & IORESOURCE_PCI_FIXED) {
	275	dev_info(&dev->dev, "BAR %d %pR is immovable\n",
	276	idx, r);
	277	} else {
	278	/* We'll assign a new address later */
	279	pcibios_save_fw_addr(dev,
	280	idx, r->start);
	281	r->end -= r->start;
	282	r->start = 0;
	283	}
1da177e4 LT	284	}
	285	}
	286	}
c7f4bbc9 YL	287	if (!pass) {
	288	r = &dev->resource[PCI_ROM_RESOURCE];
	289	if (r->flags & IORESOURCE_ROM_ENABLE) {
	290	/* Turn the ROM off, leave the resource region,
	291	* but keep it unregistered. */
	292	u32 reg;
	293	dev_dbg(&dev->dev, "disabling ROM %pR\n", r);
	294	r->flags &= ~IORESOURCE_ROM_ENABLE;
	295	pci_read_config_dword(dev, dev->rom_base_reg, &reg);
	296	pci_write_config_dword(dev, dev->rom_base_reg,
7edab2f0	297	reg & ~PCI_ROM_ADDRESS_ENABLE);
1da177e4 LT	298	}
	299	}
	300	}
	301
b95168e0	302	static void pcibios_allocate_resources(struct pci_bus *bus, int pass)
c7f4bbc9	303	{
83edc87c YL	304	struct pci_dev *dev;
83edc87c YL	305	struct pci_bus *child;
c7f4bbc9	306
83edc87c	307	list_for_each_entry(dev, &bus->devices, bus_list) {
c7f4bbc9	308	pcibios_allocate_dev_resources(dev, pass);
83edc87c YL	309
	310	child = dev->subordinate;
	311	if (child)
	312	pcibios_allocate_resources(child, pass);
	313	}
c7f4bbc9 YL	314	}
c7f4bbc9 YL	315
b95168e0	316	static void pcibios_allocate_dev_rom_resource(struct pci_dev *dev)
1da177e4	317	{
a76117df	318	struct resource *r;
1da177e4	319
dc2f56fa YL	320	/*
	321	* Try to use BIOS settings for ROMs, otherwise let
	322	* pci_assign_unassigned_resources() allocate the new
	323	* addresses.
	324	*/
	325	r = &dev->resource[PCI_ROM_RESOURCE];
	326	if (!r->flags \|\| !r->start)
	327	return;
c70d6505 MW	328	if (r->parent) /* Already allocated */
c70d6505 MW	329	return;
dc2f56fa YL	330
	331	if (pci_claim_resource(dev, PCI_ROM_RESOURCE) < 0) {
	332	r->end -= r->start;
	333	r->start = 0;
1da177e4	334	}
dc2f56fa	335	}
b95168e0	336	static void pcibios_allocate_rom_resources(struct pci_bus *bus)
dc2f56fa YL	337	{
	338	struct pci_dev *dev;
	339	struct pci_bus *child;
	340
	341	list_for_each_entry(dev, &bus->devices, bus_list) {
	342	pcibios_allocate_dev_rom_resource(dev);
	343
	344	child = dev->subordinate;
	345	if (child)
	346	pcibios_allocate_rom_resources(child);
	347	}
	348	}
	349
	350	static int __init pcibios_assign_resources(void)
	351	{
	352	struct pci_bus *bus;
	353
	354	if (!(pci_probe & PCI_ASSIGN_ROMS))
	355	list_for_each_entry(bus, &pci_root_buses, node)
	356	pcibios_allocate_rom_resources(bus);
81d4af13 IK	357
81d4af13 IK	358	pci_assign_unassigned_resources();
6535943f	359	pcibios_fw_addr_list_del();
81d4af13	360
1da177e4 LT	361	return 0;
	362	}
	363
b3e65e1f YL	364	void pcibios_resource_survey_bus(struct pci_bus *bus)
	365	{
	366	dev_printk(KERN_DEBUG, &bus->dev, "Allocating resources\n");
	367
	368	pcibios_allocate_bus_resources(bus);
	369
	370	pcibios_allocate_resources(bus, 0);
	371	pcibios_allocate_resources(bus, 1);
	372
	373	if (!(pci_probe & PCI_ASSIGN_ROMS))
	374	pcibios_allocate_rom_resources(bus);
	375	}
	376
1da177e4 LT	377	void __init pcibios_resource_survey(void)
1da177e4 LT	378	{
83edc87c YL	379	struct pci_bus *bus;
83edc87c YL	380
1da177e4	381	DBG("PCI: Allocating resources\n");
83edc87c YL	382
	383	list_for_each_entry(bus, &pci_root_buses, node)
	384	pcibios_allocate_bus_resources(bus);
	385
	386	list_for_each_entry(bus, &pci_root_buses, node)
	387	pcibios_allocate_resources(bus, 0);
	388	list_for_each_entry(bus, &pci_root_buses, node)
	389	pcibios_allocate_resources(bus, 1);
a5444d15 IM	390
a5444d15 IM	391	e820_reserve_resources_late();
857fdc53 YL	392	/*
857fdc53 YL	393	* Insert the IO APIC resources after PCI initialization has
0d2eb44f	394	* occurred to handle IO APICS that are mapped in on a BAR in
857fdc53 YL	395	* PCI space, but before trying to assign unassigned pci res.
	396	*/
	397	ioapic_insert_resources();
1da177e4 LT	398	}
	399
	400	/**
	401	* called in fs_initcall (one below subsys_initcall),
	402	* give a chance for motherboard reserve resources
	403	*/
	404	fs_initcall(pcibios_assign_resources);
	405
f0f37e2f	406	static const struct vm_operations_struct pci_mmap_ops = {
7ae8ed50	407	.access = generic_access_phys,
03d72aa1	408	};
03d72aa1	409
1da177e4 LT	410	int pci_mmap_page_range(struct pci_dev dev, struct vm_area_struct vma,
	411	enum pci_mmap_state mmap_state, int write_combine)
	412	{
	413	unsigned long prot;
	414
	415	/* I/O space cannot be accessed via normal processor loads and
	416	* stores on this platform.
	417	*/
	418	if (mmap_state == pci_mmap_io)
	419	return -EINVAL;
	420
1da177e4	421	prot = pgprot_val(vma->vm_page_prot);
2992e545 SS	422
	423	/*
	424	* Return error if pat is not enabled and write_combine is requested.
	425	* Caller can followup with UC MINUS request and add a WC mtrr if there
	426	* is a free mtrr slot.
	427	*/
	428	if (!pat_enabled && write_combine)
	429	return -EINVAL;
	430
499f8f84	431	if (pat_enabled && write_combine)
03d72aa1	432	prot \|= _PAGE_CACHE_WC;
499f8f84	433	else if (pat_enabled \|\| boot_cpu_data.x86 > 3)
de33c442 SS	434	/*
	435	* ioremap() and ioremap_nocache() defaults to UC MINUS for now.
	436	* To avoid attribute conflicts, request UC MINUS here
0d2eb44f	437	* as well.
de33c442 SS	438	*/
de33c442 SS	439	prot \|= _PAGE_CACHE_UC_MINUS;
03d72aa1	440
5ee01f49 JF	441	prot \|= _PAGE_IOMAP; /* creating a mapping for IO */
5ee01f49 JF	442
1da177e4 LT	443	vma->vm_page_prot = __pgprot(prot);
1da177e4 LT	444
346d3882 MT	445	if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
	446	vma->vm_end - vma->vm_start,
	447	vma->vm_page_prot))
1da177e4 LT	448	return -EAGAIN;
1da177e4 LT	449
03d72aa1	450	vma->vm_ops = &pci_mmap_ops;
03d72aa1	451
1da177e4 LT	452	return 0;
1da177e4 LT	453	}