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587 giacomo 1
/*
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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 <linuxcomp.h>
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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 <asm/segment.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include "pci2.h"
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#ifdef CONFIG_PCI_BIOS
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extern  void pcibios_sort(void);
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#endif
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unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2;
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int pcibios_last_bus = -1;
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struct pci_bus *pci_root_bus = NULL;
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struct pci_raw_ops *raw_pci_ops;
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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_ops->read(0, bus->number, 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_ops->write(0, bus->number, 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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spinlock_t pci_config_lock = SPIN_LOCK_UNLOCKED;
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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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        for (ln=b->devices.next; ln != &b->devices; ln=ln->next) {
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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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/*
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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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        pcibios_fixup_ghosts(b);
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        pci_read_bridge_bases(b);
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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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        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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        printk("PCI: Probing PCI hardware (bus %02x)\n", busnum);
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        return pci_scan_bus(busnum, &pci_root_ops, NULL);
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}
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extern u8 pci_cache_line_size;
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int __init pcibios_init(void)
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{
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        if (!raw_pci_ops) {
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                printk("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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        pcibios_resource_survey();
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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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        }
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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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        }
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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_ACPI_PCI
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        else if (!strcmp(str, "noacpi")) {
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                pci_probe |= PCI_NO_ACPI_ROUTING;
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                return NULL;
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        }
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#endif
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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;
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        } else if (!strncmp(str, "lastbus=", 8)) {
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                pcibios_last_bus = simple_strtol(str+8, NULL, 0);
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                return NULL;
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        }
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#endif
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        else if (!strcmp(str, "rom")) {
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                pci_probe |= PCI_ASSIGN_ROMS;
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                return NULL;
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        } else if (!strcmp(str, "assign-busses")) {
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                pci_probe |= PCI_ASSIGN_ALL_BUSSES;
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                return NULL;
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        }
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        return str;
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}
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unsigned int pcibios_assign_all_busses(void)
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{
227
        return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
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}
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int pcibios_enable_device(struct pci_dev *dev, int mask)
231
{
232
        int err;
233
 
234
        if ((err = pcibios_enable_resources(dev, mask)) < 0)
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                return err;
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        return pcibios_enable_irq(dev);
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}