1 files changed, 251 insertions, 0 deletions

diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
new file mode 100644
index 000000000000..720975e1af50
--- /dev/null
+++ b/arch/i386/pci/common.c
@@ -0,0 +1,251 @@
+/*
+ *      Low-Level PCI Support for PC
+ *
+ *      (c) 1999--2000 Martin Mares <mj@ucw.cz>
+ */
+
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+
+#include <asm/acpi.h>
+#include <asm/segment.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+
+#include "pci.h"
+
+#ifdef CONFIG_PCI_BIOS
+extern  void pcibios_sort(void);
+#endif
+
+unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
+                                PCI_PROBE_MMCONF;
+
+int pci_routeirq;
+int pcibios_last_bus = -1;
+struct pci_bus *pci_root_bus = NULL;
+struct pci_raw_ops *raw_pci_ops;
+
+static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
+{
+        return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
+}
+
+static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
+{
+        return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
+}
+
+struct pci_ops pci_root_ops = {
+        .read = pci_read,
+        .write = pci_write,
+};
+
+/*
+ * legacy, numa, and acpi all want to call pcibios_scan_root
+ * from their initcalls. This flag prevents that.
+ */
+int pcibios_scanned;
+
+/*
+ * This interrupt-safe spinlock protects all accesses to PCI
+ * configuration space.
+ */
+DEFINE_SPINLOCK(pci_config_lock);
+
+/*
+ * Several buggy motherboards address only 16 devices and mirror
+ * them to next 16 IDs. We try to detect this `feature' on all
+ * primary buses (those containing host bridges as they are
+ * expected to be unique) and remove the ghost devices.
+ */
+
+static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
+{
+        struct list_head *ln, *mn;
+        struct pci_dev *d, *e;
+        int mirror = PCI_DEVFN(16,0);
+        int seen_host_bridge = 0;
+        int i;
+
+        DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
+        list_for_each(ln, &b->devices) {
+                d = pci_dev_b(ln);
+                if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
+                        seen_host_bridge++;
+                for (mn=ln->next; mn != &b->devices; mn=mn->next) {
+                        e = pci_dev_b(mn);
+                        if (e->devfn != d->devfn + mirror ||
+                            e->vendor != d->vendor ||
+                            e->device != d->device ||
+                            e->class != d->class)
+                                continue;
+                        for(i=0; i<PCI_NUM_RESOURCES; i++)
+                                if (e->resource[i].start != d->resource[i].start ||
+                                    e->resource[i].end != d->resource[i].end ||
+                                    e->resource[i].flags != d->resource[i].flags)
+                                        continue;
+                        break;
+                }
+                if (mn == &b->devices)
+                        return;
+        }
+        if (!seen_host_bridge)
+                return;
+        printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);
+
+        ln = &b->devices;
+        while (ln->next != &b->devices) {
+                d = pci_dev_b(ln->next);
+                if (d->devfn >= mirror) {
+                        list_del(&d->global_list);
+                        list_del(&d->bus_list);
+                        kfree(d);
+                } else
+                        ln = ln->next;
+        }
+}
+
+/*
+ *  Called after each bus is probed, but before its children
+ *  are examined.
+ */
+
+void __devinit  pcibios_fixup_bus(struct pci_bus *b)
+{
+        pcibios_fixup_ghosts(b);
+        pci_read_bridge_bases(b);
+}
+
+
+struct pci_bus * __devinit pcibios_scan_root(int busnum)
+{
+        struct pci_bus *bus = NULL;
+
+        while ((bus = pci_find_next_bus(bus)) != NULL) {
+                if (bus->number == busnum) {
+                        /* Already scanned */
+                        return bus;
+                }
+        }
+
+        printk("PCI: Probing PCI hardware (bus %02x)\n", busnum);
+
+        return pci_scan_bus(busnum, &pci_root_ops, NULL);
+}
+
+extern u8 pci_cache_line_size;
+
+static int __init pcibios_init(void)
+{
+        struct cpuinfo_x86 *c = &boot_cpu_data;
+
+        if (!raw_pci_ops) {
+                printk("PCI: System does not support PCI\n");
+                return 0;
+        }
+
+        /*
+         * Assume PCI cacheline size of 32 bytes for all x86s except K7/K8
+         * and P4. It's also good for 386/486s (which actually have 16)
+         * as quite a few PCI devices do not support smaller values.
+         */
+        pci_cache_line_size = 32 >> 2;
+        if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
+                pci_cache_line_size = 64 >> 2;  /* K7 & K8 */
+        else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
+                pci_cache_line_size = 128 >> 2; /* P4 */
+
+        pcibios_resource_survey();
+
+#ifdef CONFIG_PCI_BIOS
+        if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
+                pcibios_sort();
+#endif
+        return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+char * __devinit  pcibios_setup(char *str)
+{
+        if (!strcmp(str, "off")) {
+                pci_probe = 0;
+                return NULL;
+        }
+#ifdef CONFIG_PCI_BIOS
+        else if (!strcmp(str, "bios")) {
+                pci_probe = PCI_PROBE_BIOS;
+                return NULL;
+        } else if (!strcmp(str, "nobios")) {
+                pci_probe &= ~PCI_PROBE_BIOS;
+                return NULL;
+        } else if (!strcmp(str, "nosort")) {
+                pci_probe |= PCI_NO_SORT;
+                return NULL;
+        } else if (!strcmp(str, "biosirq")) {
+                pci_probe |= PCI_BIOS_IRQ_SCAN;
+                return NULL;
+        }
+#endif
+#ifdef CONFIG_PCI_DIRECT
+        else if (!strcmp(str, "conf1")) {
+                pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
+                return NULL;
+        }
+        else if (!strcmp(str, "conf2")) {
+                pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
+                return NULL;
+        }
+#endif
+#ifdef CONFIG_PCI_MMCONFIG
+        else if (!strcmp(str, "nommconf")) {
+                pci_probe &= ~PCI_PROBE_MMCONF;
+                return NULL;
+        }
+#endif
+        else if (!strcmp(str, "noacpi")) {
+                acpi_noirq_set();
+                return NULL;
+        }
+#ifndef CONFIG_X86_VISWS
+        else if (!strcmp(str, "usepirqmask")) {
+                pci_probe |= PCI_USE_PIRQ_MASK;
+                return NULL;
+        } else if (!strncmp(str, "irqmask=", 8)) {
+                pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
+                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, "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;
+
+        return pcibios_enable_irq(dev);
+}