/*
* 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) {
/* 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, ®);
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;
}