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xtensa/PCI: convert to pci_scan_root_bus() for correct root bus resources

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Convert from pci_scan_bus() to pci_scan_root_bus() and remove root bus
fixups.  This fixes the problem of "early" and "header" quirks
seeing incorrect root bus resources.

This arch was unusual because it filled in bus->resource[0..3] in
pcibios_init(), then overwrote them, applied io_space.offset and
checked for unset resources in pcibios_fixup_bus().  I moved all of
that to a new pci_controller_apertures() that we can use before
scanning the root bus.

CC: Chris Zankel <chris@zankel.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas 2011-10-28 16:28:19 -06:00 committed by Jesse Barnes
parent 2cd6975a4f
commit 7ec303a724
1 changed files with 42 additions and 43 deletions
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85
arch/xtensa/kernel/pci.c
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@ -134,9 +134,46 @@ struct pci_controller * __init pcibios_alloc_controller(void)
return pci_ctrl;
}
static void __init pci_controller_apertures(struct pci_controller *pci_ctrl,
struct list_head *resources)
{
struct resource *res;
unsigned long io_offset;
int i;
io_offset = (unsigned long)pci_ctrl->io_space.base;
res = &pci_ctrl->io_resource;
if (!res->flags) {
if (io_offset)
printk (KERN_ERR "I/O resource not set for host"
" bridge %d\n", pci_ctrl->index);
res->start = 0;
res->end = IO_SPACE_LIMIT;
res->flags = IORESOURCE_IO;
}
res->start += io_offset;
res->end += io_offset;
pci_add_resource(resources, res);
for (i = 0; i < 3; i++) {
res = &pci_ctrl->mem_resources[i];
if (!res->flags) {
if (i > 0)
continue;
printk(KERN_ERR "Memory resource not set for "
"host bridge %d\n", pci_ctrl->index);
res->start = 0;
res->end = ~0U;
res->flags = IORESOURCE_MEM;
}
pci_add_resource(resources, res);
}
}
static int __init pcibios_init(void)
{
struct pci_controller *pci_ctrl;
struct list_head resources;
struct pci_bus *bus;
int next_busno = 0, i;
@ -145,19 +182,10 @@ static int __init pcibios_init(void)
/* Scan all of the recorded PCI controllers. */
for (pci_ctrl = pci_ctrl_head; pci_ctrl; pci_ctrl = pci_ctrl->next) {
pci_ctrl->last_busno = 0xff;
bus = pci_scan_bus(pci_ctrl->first_busno, pci_ctrl->ops,
pci_ctrl);
if (pci_ctrl->io_resource.flags) {
unsigned long offs;
offs = (unsigned long)pci_ctrl->io_space.base;
pci_ctrl->io_resource.start += offs;
pci_ctrl->io_resource.end += offs;
bus->resource[0] = &pci_ctrl->io_resource;
}
for (i = 0; i < 3; ++i)
if (pci_ctrl->mem_resources[i].flags)
bus->resource[i+1] =&pci_ctrl->mem_resources[i];
INIT_LIST_HEAD(&resources);
pci_controller_apertures(pci_ctrl, &resources);
bus = pci_scan_root_bus(NULL, pci_ctrl->first_busno,
pci_ctrl->ops, pci_ctrl, &resources);
pci_ctrl->bus = bus;
pci_ctrl->last_busno = bus->subordinate;
if (next_busno <= pci_ctrl->last_busno)
@ -178,36 +206,7 @@ void __init pcibios_fixup_bus(struct pci_bus *bus)
int i;
io_offset = (unsigned long)pci_ctrl->io_space.base;
if (bus->parent == NULL) {
/* this is a host bridge - fill in its resources */
pci_ctrl->bus = bus;
bus->resource[0] = res = &pci_ctrl->io_resource;
if (!res->flags) {
if (io_offset)
printk (KERN_ERR "I/O resource not set for host"
" bridge %d\n", pci_ctrl->index);
res->start = 0;
res->end = IO_SPACE_LIMIT;
res->flags = IORESOURCE_IO;
}
res->start += io_offset;
res->end += io_offset;
for (i = 0; i < 3; i++) {
res = &pci_ctrl->mem_resources[i];
if (!res->flags) {
if (i > 0)
continue;
printk(KERN_ERR "Memory resource not set for "
"host bridge %d\n", pci_ctrl->index);
res->start = 0;
res->end = ~0U;
res->flags = IORESOURCE_MEM;
}
bus->resource[i+1] = res;
}
} else {
if (bus->parent) {
/* This is a subordinate bridge */
pci_read_bridge_bases(bus);