Google Git
Sign in
gem5 / arm / linux-arm64-legacy / f7511d5f66f01fc451747b24e79f3ada7a3af9af / . / arch / powerpc / kernel / pci-common.c
blob: 063cdd4130497173eca006e49e310393e9b9df0b [file] [log] [blame]
/*
* Contains common pci routines for ALL ppc platform
* (based on pci_32.c and pci_64.c)
*
* Port for PPC64 David Engebretsen, IBM Corp.
* Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
*
* Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
* Rework, based on alpha PCI code.
*
* Common pmac/prep/chrp pci routines. -- Cort
*
* 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.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/list.h>
#include <linux/syscalls.h>
#include <linux/irq.h>
#include <linux/vmalloc.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/byteorder.h>
#include <asm/machdep.h>
#include <asm/ppc-pci.h>
#include <asm/firmware.h>
#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif
static DEFINE_SPINLOCK(hose_spinlock);
/* XXX kill that some day ... */
static int global_phb_number; /* Global phb counter */
/* ISA Memory physical address */
resource_size_t isa_mem_base;
/* Default PCI flags is 0 */
unsigned int ppc_pci_flags;
struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
{
struct pci_controller *phb;
phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
if (phb == NULL)
return NULL;
spin_lock(&hose_spinlock);
phb->global_number = global_phb_number++;
list_add_tail(&phb->list_node, &hose_list);
spin_unlock(&hose_spinlock);
phb->dn = dev;
phb->is_dynamic = mem_init_done;
#ifdef CONFIG_PPC64
if (dev) {
int nid = of_node_to_nid(dev);
if (nid < 0 || !node_online(nid))
nid = -1;
PHB_SET_NODE(phb, nid);
}
#endif
return phb;
}
void pcibios_free_controller(struct pci_controller *phb)
{
spin_lock(&hose_spinlock);
list_del(&phb->list_node);
spin_unlock(&hose_spinlock);
if (phb->is_dynamic)
kfree(phb);
}
int pcibios_vaddr_is_ioport(void __iomem *address)
{
int ret = 0;
struct pci_controller *hose;
unsigned long size;
spin_lock(&hose_spinlock);
list_for_each_entry(hose, &hose_list, list_node) {
#ifdef CONFIG_PPC64
size = hose->pci_io_size;
#else
size = hose->io_resource.end - hose->io_resource.start + 1;
#endif
if (address >= hose->io_base_virt &&
address < (hose->io_base_virt + size)) {
ret = 1;
break;
}
}
spin_unlock(&hose_spinlock);
return ret;
}
/*
* Return the domain number for this bus.
*/
int pci_domain_nr(struct pci_bus *bus)
{
struct pci_controller *hose = pci_bus_to_host(bus);
return hose->global_number;
}
EXPORT_SYMBOL(pci_domain_nr);
#ifdef CONFIG_PPC_OF
/* This routine is meant to be used early during boot, when the
* PCI bus numbers have not yet been assigned, and you need to
* issue PCI config cycles to an OF device.
* It could also be used to "fix" RTAS config cycles if you want
* to set pci_assign_all_buses to 1 and still use RTAS for PCI
* config cycles.
*/
struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
{
if (!have_of)
return NULL;
while(node) {
struct pci_controller *hose, *tmp;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
if (hose->dn == node)
return hose;
node = node->parent;
}
return NULL;
}
static ssize_t pci_show_devspec(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev;
struct device_node *np;
pdev = to_pci_dev (dev);
np = pci_device_to_OF_node(pdev);
if (np == NULL || np->full_name == NULL)
return 0;
return sprintf(buf, "%s", np->full_name);
}
static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
#endif /* CONFIG_PPC_OF */
/* Add sysfs properties */
int pcibios_add_platform_entries(struct pci_dev *pdev)
{
#ifdef CONFIG_PPC_OF
return device_create_file(&pdev->dev, &dev_attr_devspec);
#else
return 0;
#endif /* CONFIG_PPC_OF */
}
char __devinit *pcibios_setup(char *str)
{
return str;
}
/*
* Reads the interrupt pin to determine if interrupt is use by card.
* If the interrupt is used, then gets the interrupt line from the
* openfirmware and sets it in the pci_dev and pci_config line.
*/
int pci_read_irq_line(struct pci_dev *pci_dev)
{
struct of_irq oirq;
unsigned int virq;
/* The current device-tree that iSeries generates from the HV
* PCI informations doesn't contain proper interrupt routing,
* and all the fallback would do is print out crap, so we
* don't attempt to resolve the interrupts here at all, some
* iSeries specific fixup does it.
*
* In the long run, we will hopefully fix the generated device-tree
* instead.
*/
#ifdef CONFIG_PPC_ISERIES
if (firmware_has_feature(FW_FEATURE_ISERIES))
return -1;
#endif
DBG("Try to map irq for %s...\n", pci_name(pci_dev));
#ifdef DEBUG
memset(&oirq, 0xff, sizeof(oirq));
#endif
/* Try to get a mapping from the device-tree */
if (of_irq_map_pci(pci_dev, &oirq)) {
u8 line, pin;
/* If that fails, lets fallback to what is in the config
* space and map that through the default controller. We
* also set the type to level low since that's what PCI
* interrupts are. If your platform does differently, then
* either provide a proper interrupt tree or don't use this
* function.
*/
if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
return -1;
if (pin == 0)
return -1;
if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
line == 0xff || line == 0) {
return -1;
}
DBG(" -> no map ! Using line %d (pin %d) from PCI config\n",
line, pin);
virq = irq_create_mapping(NULL, line);
if (virq != NO_IRQ)
set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
} else {
DBG(" -> got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
oirq.size, oirq.specifier[0], oirq.specifier[1],
oirq.controller->full_name);
virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
oirq.size);
}
if(virq == NO_IRQ) {
DBG(" -> failed to map !\n");
return -1;
}
DBG(" -> mapped to linux irq %d\n", virq);
pci_dev->irq = virq;
return 0;
}
EXPORT_SYMBOL(pci_read_irq_line);
/*
* Platform support for /proc/bus/pci/X/Y mmap()s,
* modelled on the sparc64 implementation by Dave Miller.
* -- paulus.
*/
/*
* Adjust vm_pgoff of VMA such that it is the physical page offset
* corresponding to the 32-bit pci bus offset for DEV requested by the user.
*
* Basically, the user finds the base address for his device which he wishes
* to mmap. They read the 32-bit value from the config space base register,
* add whatever PAGE_SIZE multiple offset they wish, and feed this into the
* offset parameter of mmap on /proc/bus/pci/XXX for that device.
*
* Returns negative error code on failure, zero on success.
*/
static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
resource_size_t *offset,
enum pci_mmap_state mmap_state)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
unsigned long io_offset = 0;
int i, res_bit;
if (hose == 0)
return NULL; /* should never happen */
/* If memory, add on the PCI bridge address offset */
if (mmap_state == pci_mmap_mem) {
#if 0 /* See comment in pci_resource_to_user() for why this is disabled */
*offset += hose->pci_mem_offset;
#endif
res_bit = IORESOURCE_MEM;
} else {
io_offset = (unsigned long)hose->io_base_virt - _IO_BASE;
*offset += io_offset;
res_bit = IORESOURCE_IO;
}
/*
* Check that the offset requested corresponds to one of the
* resources of the device.
*/
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
struct resource *rp = &dev->resource[i];
int flags = rp->flags;
/* treat ROM as memory (should be already) */
if (i == PCI_ROM_RESOURCE)
flags |= IORESOURCE_MEM;
/* Active and same type? */
if ((flags & res_bit) == 0)
continue;
/* In the range of this resource? */
if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end)
continue;
/* found it! construct the final physical address */
if (mmap_state == pci_mmap_io)
*offset += hose->io_base_phys - io_offset;
return rp;
}
return NULL;
}
/*
* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
* device mapping.
*/
static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp,
pgprot_t protection,
enum pci_mmap_state mmap_state,
int write_combine)
{
unsigned long prot = pgprot_val(protection);
/* Write combine is always 0 on non-memory space mappings. On
* memory space, if the user didn't pass 1, we check for a
* "prefetchable" resource. This is a bit hackish, but we use
* this to workaround the inability of /sysfs to provide a write
* combine bit
*/
if (mmap_state != pci_mmap_mem)
write_combine = 0;
else if (write_combine == 0) {
if (rp->flags & IORESOURCE_PREFETCH)
write_combine = 1;
}
/* XXX would be nice to have a way to ask for write-through */
prot |= _PAGE_NO_CACHE;
if (write_combine)
prot &= ~_PAGE_GUARDED;
else
prot |= _PAGE_GUARDED;
return __pgprot(prot);
}
/*
* This one is used by /dev/mem and fbdev who have no clue about the
* PCI device, it tries to find the PCI device first and calls the
* above routine
*/
pgprot_t pci_phys_mem_access_prot(struct file *file,
unsigned long pfn,
unsigned long size,
pgprot_t protection)
{
struct pci_dev *pdev = NULL;
struct resource *found = NULL;
unsigned long prot = pgprot_val(protection);
unsigned long offset = pfn << PAGE_SHIFT;
int i;
if (page_is_ram(pfn))
return __pgprot(prot);
prot |= _PAGE_NO_CACHE | _PAGE_GUARDED;
for_each_pci_dev(pdev) {
for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
struct resource *rp = &pdev->resource[i];
int flags = rp->flags;
/* Active and same type? */
if ((flags & IORESOURCE_MEM) == 0)
continue;
/* In the range of this resource? */
if (offset < (rp->start & PAGE_MASK) ||
offset > rp->end)
continue;
found = rp;
break;
}
if (found)
break;
}
if (found) {
if (found->flags & IORESOURCE_PREFETCH)
prot &= ~_PAGE_GUARDED;
pci_dev_put(pdev);
}
DBG("non-PCI map for %lx, prot: %lx\n", offset, prot);
return __pgprot(prot);
}
/*
* Perform the actual remap of the pages for a PCI device mapping, as
* appropriate for this architecture. The region in the process to map
* is described by vm_start and vm_end members of VMA, the base physical
* address is found in vm_pgoff.
* The pci device structure is provided so that architectures may make mapping
* decisions on a per-device or per-bus basis.
*
* Returns a negative error code on failure, zero on success.
*/
int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
resource_size_t offset = vma->vm_pgoff << PAGE_SHIFT;
struct resource *rp;
int ret;
rp = __pci_mmap_make_offset(dev, &offset, mmap_state);
if (rp == NULL)
return -EINVAL;
vma->vm_pgoff = offset >> PAGE_SHIFT;
vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
vma->vm_page_prot,
mmap_state, write_combine);
ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
return ret;
}
void pci_resource_to_user(const struct pci_dev *dev, int bar,
const struct resource *rsrc,
resource_size_t *start, resource_size_t *end)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
resource_size_t offset = 0;
if (hose == NULL)
return;
if (rsrc->flags & IORESOURCE_IO)
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
/* We pass a fully fixed up address to userland for MMIO instead of
* a BAR value because X is lame and expects to be able to use that
* to pass to /dev/mem !
*
* That means that we'll have potentially 64 bits values where some
* userland apps only expect 32 (like X itself since it thinks only
* Sparc has 64 bits MMIO) but if we don't do that, we break it on
* 32 bits CHRPs :-(
*
* Hopefully, the sysfs insterface is immune to that gunk. Once X
* has been fixed (and the fix spread enough), we can re-enable the
* 2 lines below and pass down a BAR value to userland. In that case
* we'll also have to re-enable the matching code in
* __pci_mmap_make_offset().
*
* BenH.
*/
#if 0
else if (rsrc->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
#endif
*start = rsrc->start - offset;
*end = rsrc->end - offset;
}
/**
* pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
* @hose: newly allocated pci_controller to be setup
* @dev: device node of the host bridge
* @primary: set if primary bus (32 bits only, soon to be deprecated)
*
* This function will parse the "ranges" property of a PCI host bridge device
* node and setup the resource mapping of a pci controller based on its
* content.
*
* Life would be boring if it wasn't for a few issues that we have to deal
* with here:
*
* - We can only cope with one IO space range and up to 3 Memory space
* ranges. However, some machines (thanks Apple !) tend to split their
* space into lots of small contiguous ranges. So we have to coalesce.
*
* - We can only cope with all memory ranges having the same offset
* between CPU addresses and PCI addresses. Unfortunately, some bridges
* are setup for a large 1:1 mapping along with a small "window" which
* maps PCI address 0 to some arbitrary high address of the CPU space in
* order to give access to the ISA memory hole.
* The way out of here that I've chosen for now is to always set the
* offset based on the first resource found, then override it if we
* have a different offset and the previous was set by an ISA hole.
*
* - Some busses have IO space not starting at 0, which causes trouble with
* the way we do our IO resource renumbering. The code somewhat deals with
* it for 64 bits but I would expect problems on 32 bits.
*
* - Some 32 bits platforms such as 4xx can have physical space larger than
* 32 bits so we need to use 64 bits values for the parsing
*/
void __devinit pci_process_bridge_OF_ranges(struct pci_controller *hose,
struct device_node *dev,
int primary)
{
const u32 *ranges;
int rlen;
int pna = of_n_addr_cells(dev);
int np = pna + 5;
int memno = 0, isa_hole = -1;
u32 pci_space;
unsigned long long pci_addr, cpu_addr, pci_next, cpu_next, size;
unsigned long long isa_mb = 0;
struct resource *res;
printk(KERN_INFO "PCI host bridge %s %s ranges:\n",
dev->full_name, primary ? "(primary)" : "");
/* Get ranges property */
ranges = of_get_property(dev, "ranges", &rlen);
if (ranges == NULL)
return;
/* Parse it */
while ((rlen -= np * 4) >= 0) {
/* Read next ranges element */
pci_space = ranges[0];
pci_addr = of_read_number(ranges + 1, 2);
cpu_addr = of_translate_address(dev, ranges + 3);
size = of_read_number(ranges + pna + 3, 2);
ranges += np;
if (cpu_addr == OF_BAD_ADDR || size == 0)
continue;
/* Now consume following elements while they are contiguous */
for (; rlen >= np * sizeof(u32);
ranges += np, rlen -= np * 4) {
if (ranges[0] != pci_space)
break;
pci_next = of_read_number(ranges + 1, 2);
cpu_next = of_translate_address(dev, ranges + 3);
if (pci_next != pci_addr + size ||
cpu_next != cpu_addr + size)
break;
size += of_read_number(ranges + pna + 3, 2);
}
/* Act based on address space type */
res = NULL;
switch ((pci_space >> 24) & 0x3) {
case 1: /* PCI IO space */
printk(KERN_INFO
" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
cpu_addr, cpu_addr + size - 1, pci_addr);
/* We support only one IO range */
if (hose->pci_io_size) {
printk(KERN_INFO
" \\--> Skipped (too many) !\n");
continue;
}
#ifdef CONFIG_PPC32
/* On 32 bits, limit I/O space to 16MB */
if (size > 0x01000000)
size = 0x01000000;
/* 32 bits needs to map IOs here */
hose->io_base_virt = ioremap(cpu_addr, size);
/* Expect trouble if pci_addr is not 0 */
if (primary)
isa_io_base =
(unsigned long)hose->io_base_virt;
#endif /* CONFIG_PPC32 */
/* pci_io_size and io_base_phys always represent IO
* space starting at 0 so we factor in pci_addr
*/
hose->pci_io_size = pci_addr + size;
hose->io_base_phys = cpu_addr - pci_addr;
/* Build resource */
res = &hose->io_resource;
res->flags = IORESOURCE_IO;
res->start = pci_addr;
break;
case 2: /* PCI Memory space */
printk(KERN_INFO
" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
cpu_addr, cpu_addr + size - 1, pci_addr,
(pci_space & 0x40000000) ? "Prefetch" : "");
/* We support only 3 memory ranges */
if (memno >= 3) {
printk(KERN_INFO
" \\--> Skipped (too many) !\n");
continue;
}
/* Handles ISA memory hole space here */
if (pci_addr == 0) {
isa_mb = cpu_addr;
isa_hole = memno;
if (primary || isa_mem_base == 0)
isa_mem_base = cpu_addr;
}
/* We get the PCI/Mem offset from the first range or
* the, current one if the offset came from an ISA
* hole. If they don't match, bugger.
*/
if (memno == 0 ||
(isa_hole >= 0 && pci_addr != 0 &&
hose->pci_mem_offset == isa_mb))
hose->pci_mem_offset = cpu_addr - pci_addr;
else if (pci_addr != 0 &&
hose->pci_mem_offset != cpu_addr - pci_addr) {
printk(KERN_INFO
" \\--> Skipped (offset mismatch) !\n");
continue;
}
/* Build resource */
res = &hose->mem_resources[memno++];
res->flags = IORESOURCE_MEM;
if (pci_space & 0x40000000)
res->flags |= IORESOURCE_PREFETCH;
res->start = cpu_addr;
break;
}
if (res != NULL) {
res->name = dev->full_name;
res->end = res->start + size - 1;
res->parent = NULL;
res->sibling = NULL;
res->child = NULL;
}
}
/* Out of paranoia, let's put the ISA hole last if any */
if (isa_hole >= 0 && memno > 0 && isa_hole != (memno-1)) {
struct resource tmp = hose->mem_resources[isa_hole];
hose->mem_resources[isa_hole] = hose->mem_resources[memno-1];
hose->mem_resources[memno-1] = tmp;
}
}
/* Decide whether to display the domain number in /proc */
int pci_proc_domain(struct pci_bus *bus)
{
struct pci_controller *hose = pci_bus_to_host(bus);
#ifdef CONFIG_PPC64
return hose->buid != 0;
#else
if (!(ppc_pci_flags & PPC_PCI_ENABLE_PROC_DOMAINS))
return 0;
if (ppc_pci_flags & PPC_PCI_COMPAT_DOMAIN_0)
return hose->global_number != 0;
return 1;
#endif
}
void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
struct resource *res)
{
resource_size_t offset = 0, mask = (resource_size_t)-1;
struct pci_controller *hose = pci_bus_to_host(dev->bus);
if (!hose)
return;
if (res->flags & IORESOURCE_IO) {
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
mask = 0xffffffffu;
} else if (res->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
region->start = (res->start - offset) & mask;
region->end = (res->end - offset) & mask;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);
void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
struct pci_bus_region *region)
{
resource_size_t offset = 0, mask = (resource_size_t)-1;
struct pci_controller *hose = pci_bus_to_host(dev->bus);
if (!hose)
return;
if (res->flags & IORESOURCE_IO) {
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
mask = 0xffffffffu;
} else if (res->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
res->start = (region->start + offset) & mask;
res->end = (region->end + offset) & mask;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);
/* Fixup a bus resource into a linux resource */
static void __devinit fixup_resource(struct resource *res, struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
resource_size_t offset = 0, mask = (resource_size_t)-1;
if (res->flags & IORESOURCE_IO) {
offset = (unsigned long)hose->io_base_virt - _IO_BASE;
mask = 0xffffffffu;
} else if (res->flags & IORESOURCE_MEM)
offset = hose->pci_mem_offset;
res->start = (res->start + offset) & mask;
res->end = (res->end + offset) & mask;
pr_debug("PCI:%s %016llx-%016llx\n",
pci_name(dev),
(unsigned long long)res->start,
(unsigned long long)res->end);
}
/* This header fixup will do the resource fixup for all devices as they are
* probed, but not for bridge ranges
*/
static void __devinit pcibios_fixup_resources(struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
int i;
if (!hose) {
printk(KERN_ERR "No host bridge for PCI dev %s !\n",
pci_name(dev));
return;
}
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
struct resource *res = dev->resource + i;
if (!res->flags)
continue;
/* On platforms that have PPC_PCI_PROBE_ONLY set, we don't
* consider 0 as an unassigned BAR value. It's technically
* a valid value, but linux doesn't like it... so when we can
* re-assign things, we do so, but if we can't, we keep it
* around and hope for the best...
*/
if (res->start == 0 && !(ppc_pci_flags & PPC_PCI_PROBE_ONLY)) {
pr_debug("PCI:%s Resource %d %016llx-%016llx [%x] is unassigned\n",
pci_name(dev), i,
(unsigned long long)res->start,
(unsigned long long)res->end,
(unsigned int)res->flags);
res->end -= res->start;
res->start = 0;
res->flags |= IORESOURCE_UNSET;
continue;
}
pr_debug("PCI:%s Resource %d %016llx-%016llx [%x] fixup...\n",
pci_name(dev), i,
(unsigned long long)res->start,\
(unsigned long long)res->end,
(unsigned int)res->flags);
fixup_resource(res, dev);
}
/* Call machine specific resource fixup */
if (ppc_md.pcibios_fixup_resources)
ppc_md.pcibios_fixup_resources(dev);
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
static void __devinit __pcibios_fixup_bus(struct pci_bus *bus)
{
struct pci_controller *hose = pci_bus_to_host(bus);
struct pci_dev *dev = bus->self;
pr_debug("PCI: Fixup bus %d (%s)\n", bus->number, dev ? pci_name(dev) : "PHB");
/* Fixup PCI<->PCI bridges. Host bridges are handled separately, for
* now differently between 32 and 64 bits.
*/
if (dev != NULL) {
struct resource *res;
int i;
for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
if ((res = bus->resource[i]) == NULL)
continue;
if (!res->flags)
continue;
if (i >= 3 && bus->self->transparent)
continue;
/* On PowerMac, Apple leaves bridge windows open over
* an inaccessible region of memory space (0...fffff)
* which is somewhat bogus, but that's what they think
* means disabled...
*
* We clear those to force them to be reallocated later
*
* We detect such regions by the fact that the base is
* equal to the pci_mem_offset of the host bridge and
* their size is smaller than 1M.
*/
if (res->flags & IORESOURCE_MEM &&
res->start == hose->pci_mem_offset &&
res->end < 0x100000) {
printk(KERN_INFO
"PCI: Closing bogus Apple Firmware"
" region %d on bus 0x%02x\n",
i, bus->number);
res->flags = 0;
continue;
}
pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n",
pci_name(dev), i,
(unsigned long long)res->start,\
(unsigned long long)res->end,
(unsigned int)res->flags);
fixup_resource(res, dev);
}
}
/* Additional setup that is different between 32 and 64 bits for now */
pcibios_do_bus_setup(bus);
/* Platform specific bus fixups */
if (ppc_md.pcibios_fixup_bus)
ppc_md.pcibios_fixup_bus(bus);
/* Read default IRQs and fixup if necessary */
list_for_each_entry(dev, &bus->devices, bus_list) {
pci_read_irq_line(dev);
if (ppc_md.pci_irq_fixup)
ppc_md.pci_irq_fixup(dev);
}
}
void __devinit pcibios_fixup_bus(struct pci_bus *bus)
{
/* When called from the generic PCI probe, read PCI<->PCI bridge
* bases before proceeding
*/
if (bus->self != NULL)
pci_read_bridge_bases(bus);
__pcibios_fixup_bus(bus);
}
EXPORT_SYMBOL(pcibios_fixup_bus);
/* When building a bus from the OF tree rather than probing, we need a
* slightly different version of the fixup which doesn't read the
* bridge bases using config space accesses
*/
void __devinit pcibios_fixup_of_probed_bus(struct pci_bus *bus)
{
__pcibios_fixup_bus(bus);
}
static int skip_isa_ioresource_align(struct pci_dev *dev)
{
if ((ppc_pci_flags & PPC_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..
*/
void pcibios_align_resource(void *data, struct resource *res,
resource_size_t size, resource_size_t align)
{
struct pci_dev *dev = data;
if (res->flags & IORESOURCE_IO) {
resource_size_t start = res->start;
if (skip_isa_ioresource_align(dev))
return;
if (start & 0x300) {
start = (start + 0x3ff) & ~0x3ff;
res->start = start;
}
}
}
EXPORT_SYMBOL(pcibios_align_resource);
/*
* Reparent resource children of pr that conflict with res
* under res, and make res replace those children.
*/
static int __init reparent_resources(struct resource *parent,
struct resource *res)
{
struct resource *p, **pp;
struct resource **firstpp = NULL;
for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) {
if (p->end < res->start)
continue;
if (res->end < p->start)
break;
if (p->start < res->start || p->end > res->end)
return -1; /* not completely contained */
if (firstpp == NULL)
firstpp = pp;
}
if (firstpp == NULL)
return -1; /* didn't find any conflicting entries? */
res->parent = parent;
res->child = *firstpp;
res->sibling = *pp;
*firstpp = res;
*pp = NULL;
for (p = res->child; p != NULL; p = p->sibling) {
p->parent = res;
DBG(KERN_INFO "PCI: reparented %s [%llx..%llx] under %s\n",
p->name,
(unsigned long long)p->start,
(unsigned long long)p->end, res->name);
}
return 0;
}
/*
* 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)
*
* 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 __init pcibios_allocate_bus_resources(struct list_head *bus_list)
{
struct pci_bus *bus;
int i;
struct resource *res, *pr;
/* Depth-First Search on bus tree */
list_for_each_entry(bus, bus_list, node) {
for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
if ((res = bus->resource[i]) == NULL || !res->flags
|| res->start > res->end)
continue;
if (bus->parent == NULL)
pr = (res->flags & IORESOURCE_IO) ?
&ioport_resource : &iomem_resource;
else {
/* Don't bother with non-root busses when
* re-assigning all resources. We clear the
* resource flags as if they were colliding
* and as such ensure proper re-allocation
* later.
*/
if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_RSRC)
goto clear_resource;
pr = pci_find_parent_resource(bus->self, res);
if (pr == res) {
/* this happens when the generic PCI
* code (wrongly) decides that this
* bridge is transparent -- paulus
*/
continue;
}
}
DBG("PCI: %s (bus %d) bridge rsrc %d: %016llx-%016llx "
"[0x%x], parent %p (%s)\n",
bus->self ? pci_name(bus->self) : "PHB",
bus->number, i,
(unsigned long long)res->start,
(unsigned long long)res->end,
(unsigned int)res->flags,
pr, (pr && pr->name) ? pr->name : "nil");
if (pr && !(pr->flags & IORESOURCE_UNSET)) {
if (request_resource(pr, res) == 0)
continue;
/*
* Must be a conflict with an existing entry.
* Move that entry (or entries) under the
* bridge resource and try again.
*/
if (reparent_resources(pr, res) == 0)
continue;
}
printk(KERN_WARNING
"PCI: Cannot allocate resource region "
"%d of PCI bridge %d, will remap\n",
i, bus->number);
clear_resource:
res->flags = 0;
}
pcibios_allocate_bus_resources(&bus->children);
}
}
static inline void __devinit alloc_resource(struct pci_dev *dev, int idx)
{
struct resource *pr, *r = &dev->resource[idx];
DBG("PCI: Allocating %s: Resource %d: %016llx..%016llx [%x]\n",
pci_name(dev), idx,
(unsigned long long)r->start,
(unsigned long long)r->end,
(unsigned int)r->flags);
pr = pci_find_parent_resource(dev, r);
if (!pr || (pr->flags & IORESOURCE_UNSET) ||
request_resource(pr, r) < 0) {
printk(KERN_WARNING "PCI: Cannot allocate resource region %d"
" of device %s, will remap\n", idx, pci_name(dev));
if (pr)
DBG("PCI: parent is %p: %016llx-%016llx [%x]\n", pr,
(unsigned long long)pr->start,
(unsigned long long)pr->end,
(unsigned int)pr->flags);
/* We'll assign a new address later */
r->flags |= IORESOURCE_UNSET;
r->end -= r->start;
r->start = 0;
}
}
static void __init pcibios_allocate_resources(int pass)
{
struct pci_dev *dev = NULL;
int idx, disabled;
u16 command;
struct resource *r;
for_each_pci_dev(dev) {
pci_read_config_word(dev, PCI_COMMAND, &command);
for (idx = 0; idx < 6; idx++) {
r = &dev->resource[idx];
if (r->parent) /* Already allocated */
continue;
if (!r->flags || (r->flags & IORESOURCE_UNSET))
continue; /* Not assigned at all */
if (r->flags & IORESOURCE_IO)
disabled = !(command & PCI_COMMAND_IO);
else
disabled = !(command & PCI_COMMAND_MEMORY);
if (pass == disabled)
alloc_resource(dev, idx);
}
if (pass)
continue;
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;
DBG("PCI: Switching off ROM of %s\n", pci_name(dev));
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);
}
}
}
void __init pcibios_resource_survey(void)
{
/* Allocate and assign resources. If we re-assign everything, then
* we skip the allocate phase
*/
pcibios_allocate_bus_resources(&pci_root_buses);
if (!(ppc_pci_flags & PPC_PCI_REASSIGN_ALL_RSRC)) {
pcibios_allocate_resources(0);
pcibios_allocate_resources(1);
}
if (!(ppc_pci_flags & PPC_PCI_PROBE_ONLY)) {
DBG("PCI: Assigning unassigned resouces...\n");
pci_assign_unassigned_resources();
}
/* Call machine dependent fixup */
if (ppc_md.pcibios_fixup)
ppc_md.pcibios_fixup();
}
#ifdef CONFIG_HOTPLUG
/* This is used by the pSeries hotplug driver to allocate resource
* of newly plugged busses. We can try to consolidate with the
* rest of the code later, for now, keep it as-is
*/
void __devinit pcibios_claim_one_bus(struct pci_bus *bus)
{
struct pci_dev *dev;
struct pci_bus *child_bus;
list_for_each_entry(dev, &bus->devices, bus_list) {
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (r->parent || !r->start || !r->flags)
continue;
pci_claim_resource(dev, i);
}
}
list_for_each_entry(child_bus, &bus->children, node)
pcibios_claim_one_bus(child_bus);
}
EXPORT_SYMBOL_GPL(pcibios_claim_one_bus);
#endif /* CONFIG_HOTPLUG */
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
if (ppc_md.pcibios_enable_device_hook)
if (ppc_md.pcibios_enable_device_hook(dev))
return -EINVAL;
return pci_enable_resources(dev, mask);
}