![Bjorn Helgaas](/assets/img/avatar_default.png)
The following flags are only used on x86, but they got copied to FR-V, MN10300, and SuperH: PCI_PROBE_BIOS PCI_PROBE_CONF1 PCI_PROBE_CONF2 PCI_ASSIGN_ROMS PCI_NO_CHECKS PCI_BIOS_IRQ_SCAN PCI_ASSIGN_ALL_BUSSES FR-V and MN10300 do test for PCI_ASSIGN_ROMS, but they never set it, so it's dead code. Remove the unused flags above. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/* ASB2305 PCI resource stuff
|
|
*
|
|
* Copyright (C) 2001 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
* - Derived from arch/i386/pci-i386.c
|
|
* - Copyright 1997--2000 Martin Mares <mj@suse.cz>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/errno.h>
|
|
#include "pci-asb2305.h"
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
resource_size_t start = res->start;
|
|
|
|
#if 0
|
|
struct pci_dev *dev = data;
|
|
|
|
printk(KERN_DEBUG
|
|
"### PCIBIOS_ALIGN_RESOURCE(%s,,{%08lx-%08lx,%08lx},%lx)\n",
|
|
pci_name(dev),
|
|
res->start,
|
|
res->end,
|
|
res->flags,
|
|
size
|
|
);
|
|
#endif
|
|
|
|
if ((res->flags & IORESOURCE_IO) && (start & 0x300))
|
|
start = (start + 0x3ff) & ~0x3ff;
|
|
|
|
return start;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
struct pci_dev *dev;
|
|
int idx;
|
|
struct resource *r;
|
|
|
|
/* Depth-First Search on bus tree */
|
|
list_for_each_entry(bus, bus_list, node) {
|
|
dev = bus->self;
|
|
if (dev) {
|
|
for (idx = PCI_BRIDGE_RESOURCES;
|
|
idx < PCI_NUM_RESOURCES;
|
|
idx++) {
|
|
r = &dev->resource[idx];
|
|
if (!r->flags)
|
|
continue;
|
|
if (!r->start ||
|
|
pci_claim_bridge_resource(dev, idx) < 0) {
|
|
printk(KERN_ERR "PCI:"
|
|
" Cannot allocate resource"
|
|
" region %d of bridge %s\n",
|
|
idx, pci_name(dev));
|
|
/* 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;
|
|
}
|
|
}
|
|
}
|
|
pcibios_allocate_bus_resources(&bus->children);
|
|
}
|
|
}
|
|
|
|
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->start) /* Address not assigned */
|
|
continue;
|
|
if (r->flags & IORESOURCE_IO)
|
|
disabled = !(command & PCI_COMMAND_IO);
|
|
else
|
|
disabled = !(command & PCI_COMMAND_MEMORY);
|
|
if (pass == disabled) {
|
|
DBG("PCI[%s]: Resource %08lx-%08lx"
|
|
" (f=%lx, d=%d, p=%d)\n",
|
|
pci_name(dev), r->start, r->end, r->flags,
|
|
disabled, pass);
|
|
if (pci_claim_resource(dev, idx) < 0) {
|
|
printk(KERN_ERR "PCI:"
|
|
" Cannot allocate resource"
|
|
" region %d of device %s\n",
|
|
idx, pci_name(dev));
|
|
/* We'll assign a new address later */
|
|
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;
|
|
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, ®);
|
|
pci_write_config_dword(
|
|
dev, dev->rom_base_reg,
|
|
reg & ~PCI_ROM_ADDRESS_ENABLE);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __init pcibios_assign_resources(void)
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
struct resource *r;
|
|
|
|
/* Try to use BIOS settings for ROMs, otherwise let
|
|
pci_assign_unassigned_resources() allocate the new
|
|
addresses. */
|
|
for_each_pci_dev(dev) {
|
|
r = &dev->resource[PCI_ROM_RESOURCE];
|
|
if (!r->flags || !r->start)
|
|
continue;
|
|
if (pci_claim_resource(dev, PCI_ROM_RESOURCE) < 0) {
|
|
r->end -= r->start;
|
|
r->start = 0;
|
|
}
|
|
}
|
|
|
|
pci_assign_unassigned_resources();
|
|
|
|
return 0;
|
|
}
|
|
|
|
fs_initcall(pcibios_assign_resources);
|
|
|
|
void __init pcibios_resource_survey(void)
|
|
{
|
|
DBG("PCI: Allocating resources\n");
|
|
pcibios_allocate_bus_resources(&pci_root_buses);
|
|
pcibios_allocate_resources(0);
|
|
pcibios_allocate_resources(1);
|
|
}
|
|
|
|
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;
|
|
|
|
/* Leave vm_pgoff as-is, the PCI space address is the physical
|
|
* address on this platform.
|
|
*/
|
|
vma->vm_flags |= VM_LOCKED;
|
|
|
|
prot = pgprot_val(vma->vm_page_prot);
|
|
prot &= ~_PAGE_CACHE;
|
|
vma->vm_page_prot = __pgprot(prot);
|
|
|
|
/* Write-combine setting is ignored */
|
|
if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|