mirror of https://gitee.com/openkylin/linux.git
566 lines
13 KiB
C
566 lines
13 KiB
C
/*
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* Low-Level PCI Support for PC
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*
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* (c) 1999--2000 Martin Mares <mj@ucw.cz>
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*/
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <asm/acpi.h>
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#include <asm/segment.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include "pci.h"
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unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
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PCI_PROBE_MMCONF;
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static int pci_bf_sort;
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int pci_routeirq;
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int pcibios_last_bus = -1;
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unsigned long pirq_table_addr;
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struct pci_bus *pci_root_bus;
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struct pci_raw_ops *raw_pci_ops;
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struct pci_raw_ops *raw_pci_ext_ops;
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int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 *val)
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{
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if (reg < 256 && raw_pci_ops)
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return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
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if (raw_pci_ext_ops)
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return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
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return -EINVAL;
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}
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int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 val)
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{
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if (reg < 256 && raw_pci_ops)
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return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
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if (raw_pci_ext_ops)
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return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
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return -EINVAL;
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}
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static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
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{
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return raw_pci_read(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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}
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static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
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{
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return raw_pci_write(pci_domain_nr(bus), bus->number,
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devfn, where, size, value);
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}
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struct pci_ops pci_root_ops = {
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.read = pci_read,
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.write = pci_write,
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};
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/*
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* legacy, numa, and acpi all want to call pcibios_scan_root
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* from their initcalls. This flag prevents that.
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*/
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int pcibios_scanned;
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/*
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* This interrupt-safe spinlock protects all accesses to PCI
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* configuration space.
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*/
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DEFINE_SPINLOCK(pci_config_lock);
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/*
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* Several buggy motherboards address only 16 devices and mirror
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* them to next 16 IDs. We try to detect this `feature' on all
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* primary buses (those containing host bridges as they are
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* expected to be unique) and remove the ghost devices.
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*/
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static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
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{
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struct list_head *ln, *mn;
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struct pci_dev *d, *e;
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int mirror = PCI_DEVFN(16,0);
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int seen_host_bridge = 0;
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int i;
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DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
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list_for_each(ln, &b->devices) {
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d = pci_dev_b(ln);
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if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
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seen_host_bridge++;
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for (mn=ln->next; mn != &b->devices; mn=mn->next) {
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e = pci_dev_b(mn);
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if (e->devfn != d->devfn + mirror ||
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e->vendor != d->vendor ||
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e->device != d->device ||
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e->class != d->class)
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continue;
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for(i=0; i<PCI_NUM_RESOURCES; i++)
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if (e->resource[i].start != d->resource[i].start ||
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e->resource[i].end != d->resource[i].end ||
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e->resource[i].flags != d->resource[i].flags)
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continue;
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break;
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}
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if (mn == &b->devices)
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return;
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}
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if (!seen_host_bridge)
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return;
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printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);
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ln = &b->devices;
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while (ln->next != &b->devices) {
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d = pci_dev_b(ln->next);
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if (d->devfn >= mirror) {
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list_del(&d->global_list);
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list_del(&d->bus_list);
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kfree(d);
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} else
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ln = ln->next;
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}
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}
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static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
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{
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struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
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if (rom_r->parent)
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return;
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if (rom_r->start)
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/* we deal with BIOS assigned ROM later */
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return;
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if (!(pci_probe & PCI_ASSIGN_ROMS))
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rom_r->start = rom_r->end = rom_r->flags = 0;
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}
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/*
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* Called after each bus is probed, but before its children
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* are examined.
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*/
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void __devinit pcibios_fixup_bus(struct pci_bus *b)
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{
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struct pci_dev *dev;
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pcibios_fixup_ghosts(b);
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pci_read_bridge_bases(b);
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list_for_each_entry(dev, &b->devices, bus_list)
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pcibios_fixup_device_resources(dev);
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}
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/*
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* Only use DMI information to set this if nothing was passed
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* on the kernel command line (which was parsed earlier).
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*/
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static int __devinit set_bf_sort(const struct dmi_system_id *d)
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{
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if (pci_bf_sort == pci_bf_sort_default) {
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pci_bf_sort = pci_dmi_bf;
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printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
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}
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return 0;
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}
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/*
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* Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
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*/
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#ifdef __i386__
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static int __devinit assign_all_busses(const struct dmi_system_id *d)
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{
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pci_probe |= PCI_ASSIGN_ALL_BUSSES;
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printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
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" (pci=assign-busses)\n", d->ident);
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return 0;
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}
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#endif
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static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
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#ifdef __i386__
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/*
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* Laptops which need pci=assign-busses to see Cardbus cards
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*/
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{
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.callback = assign_all_busses,
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.ident = "Samsung X20 Laptop",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
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DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
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},
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},
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#endif /* __i386__ */
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 1950",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 1955",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 2900",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge 2950",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "Dell PowerEdge R900",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL20p G3",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL20p G4",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL30p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL25p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL35p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL45p G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL45p G2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL460c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL465c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL480c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant BL685c G1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant DL385 G2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant DL585 G2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
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},
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},
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#ifdef __i386__
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{
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.callback = assign_all_busses,
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.ident = "Compaq EVO N800c",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
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DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
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},
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},
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#endif
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant DL385 G2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
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},
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},
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{
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.callback = set_bf_sort,
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.ident = "HP ProLiant DL585 G2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "HP"),
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DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
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},
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},
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{}
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};
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struct pci_bus * __devinit pcibios_scan_root(int busnum)
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{
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struct pci_bus *bus = NULL;
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struct pci_sysdata *sd;
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dmi_check_system(pciprobe_dmi_table);
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while ((bus = pci_find_next_bus(bus)) != NULL) {
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if (bus->number == busnum) {
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/* Already scanned */
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return bus;
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}
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}
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/* Allocate per-root-bus (not per bus) arch-specific data.
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* TODO: leak; this memory is never freed.
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* It's arguable whether it's worth the trouble to care.
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*/
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sd = kzalloc(sizeof(*sd), GFP_KERNEL);
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if (!sd) {
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printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
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return NULL;
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}
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printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
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return pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
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}
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extern u8 pci_cache_line_size;
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static int __init pcibios_init(void)
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{
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struct cpuinfo_x86 *c = &boot_cpu_data;
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if (!raw_pci_ops) {
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printk(KERN_WARNING "PCI: System does not support PCI\n");
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return 0;
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}
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/*
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* Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
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* and P4. It's also good for 386/486s (which actually have 16)
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* as quite a few PCI devices do not support smaller values.
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*/
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pci_cache_line_size = 32 >> 2;
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if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
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pci_cache_line_size = 64 >> 2; /* K7 & K8 */
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else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
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pci_cache_line_size = 128 >> 2; /* P4 */
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pcibios_resource_survey();
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if (pci_bf_sort >= pci_force_bf)
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pci_sort_breadthfirst();
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#ifdef CONFIG_PCI_BIOS
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if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
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pcibios_sort();
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#endif
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return 0;
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}
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subsys_initcall(pcibios_init);
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char * __devinit pcibios_setup(char *str)
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{
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if (!strcmp(str, "off")) {
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pci_probe = 0;
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return NULL;
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} else if (!strcmp(str, "bfsort")) {
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pci_bf_sort = pci_force_bf;
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return NULL;
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} else if (!strcmp(str, "nobfsort")) {
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pci_bf_sort = pci_force_nobf;
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return NULL;
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}
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#ifdef CONFIG_PCI_BIOS
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else if (!strcmp(str, "bios")) {
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pci_probe = PCI_PROBE_BIOS;
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return NULL;
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} else if (!strcmp(str, "nobios")) {
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pci_probe &= ~PCI_PROBE_BIOS;
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return NULL;
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} else if (!strcmp(str, "nosort")) {
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pci_probe |= PCI_NO_SORT;
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return NULL;
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} else if (!strcmp(str, "biosirq")) {
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pci_probe |= PCI_BIOS_IRQ_SCAN;
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return NULL;
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} else if (!strncmp(str, "pirqaddr=", 9)) {
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pirq_table_addr = simple_strtoul(str+9, NULL, 0);
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return NULL;
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}
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#endif
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#ifdef CONFIG_PCI_DIRECT
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else if (!strcmp(str, "conf1")) {
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pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
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return NULL;
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}
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else if (!strcmp(str, "conf2")) {
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pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
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return NULL;
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}
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#endif
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#ifdef CONFIG_PCI_MMCONFIG
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else if (!strcmp(str, "nommconf")) {
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pci_probe &= ~PCI_PROBE_MMCONF;
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return NULL;
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}
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#endif
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else if (!strcmp(str, "noacpi")) {
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acpi_noirq_set();
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return NULL;
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}
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else if (!strcmp(str, "noearly")) {
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pci_probe |= PCI_PROBE_NOEARLY;
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return NULL;
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}
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#ifndef CONFIG_X86_VISWS
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else if (!strcmp(str, "usepirqmask")) {
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pci_probe |= PCI_USE_PIRQ_MASK;
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return NULL;
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} else if (!strncmp(str, "irqmask=", 8)) {
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pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
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return NULL;
|
|
} else if (!strncmp(str, "lastbus=", 8)) {
|
|
pcibios_last_bus = simple_strtol(str+8, NULL, 0);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
else if (!strcmp(str, "rom")) {
|
|
pci_probe |= PCI_ASSIGN_ROMS;
|
|
return NULL;
|
|
} else if (!strcmp(str, "assign-busses")) {
|
|
pci_probe |= PCI_ASSIGN_ALL_BUSSES;
|
|
return NULL;
|
|
} else if (!strcmp(str, "use_crs")) {
|
|
pci_probe |= PCI_USE__CRS;
|
|
return NULL;
|
|
} else if (!strcmp(str, "routeirq")) {
|
|
pci_routeirq = 1;
|
|
return NULL;
|
|
}
|
|
return str;
|
|
}
|
|
|
|
unsigned int pcibios_assign_all_busses(void)
|
|
{
|
|
return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
|
|
}
|
|
|
|
int pcibios_enable_device(struct pci_dev *dev, int mask)
|
|
{
|
|
int err;
|
|
|
|
if ((err = pcibios_enable_resources(dev, mask)) < 0)
|
|
return err;
|
|
|
|
if (!dev->msi_enabled)
|
|
return pcibios_enable_irq(dev);
|
|
return 0;
|
|
}
|
|
|
|
void pcibios_disable_device (struct pci_dev *dev)
|
|
{
|
|
if (!dev->msi_enabled && pcibios_disable_irq)
|
|
pcibios_disable_irq(dev);
|
|
}
|
|
|
|
struct pci_bus *__devinit pci_scan_bus_with_sysdata(int busno)
|
|
{
|
|
struct pci_bus *bus = NULL;
|
|
struct pci_sysdata *sd;
|
|
|
|
/*
|
|
* Allocate per-root-bus (not per bus) arch-specific data.
|
|
* TODO: leak; this memory is never freed.
|
|
* It's arguable whether it's worth the trouble to care.
|
|
*/
|
|
sd = kzalloc(sizeof(*sd), GFP_KERNEL);
|
|
if (!sd) {
|
|
printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
|
|
return NULL;
|
|
}
|
|
sd->node = -1;
|
|
bus = pci_scan_bus(busno, &pci_root_ops, sd);
|
|
if (!bus)
|
|
kfree(sd);
|
|
|
|
return bus;
|
|
}
|