i386: move pci

[sfrench/cifs-2.6.git] / arch / x86 / pci / visws.c

diff --git a/arch/x86/pci/visws.c b/arch/x86/pci/visws.c
new file mode 100644 (file)
index 0000000..8ecb1c7
--- /dev/null
+++ b/arch/x86/pci/visws.c
@@ -0,0 +1,111 @@
+/*
+ *     Low-Level PCI Support for SGI Visual Workstation
+ *
+ *     (c) 1999--2000 Martin Mares <mj@ucw.cz>
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include "cobalt.h"
+#include "lithium.h"
+
+#include "pci.h"
+
+
+extern struct pci_raw_ops pci_direct_conf1;
+
+static int pci_visws_enable_irq(struct pci_dev *dev) { return 0; }
+static void pci_visws_disable_irq(struct pci_dev *dev) { }
+
+int (*pcibios_enable_irq)(struct pci_dev *dev) = &pci_visws_enable_irq;
+void (*pcibios_disable_irq)(struct pci_dev *dev) = &pci_visws_disable_irq;
+
+void __init pcibios_penalize_isa_irq(int irq, int active) {}
+
+
+unsigned int pci_bus0, pci_bus1;
+
+static inline u8 bridge_swizzle(u8 pin, u8 slot) 
+{
+       return (((pin - 1) + slot) % 4) + 1;
+}
+
+static u8 __init visws_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+       u8 pin = *pinp;
+
+       while (dev->bus->self) {        /* Move up the chain of bridges. */
+               pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+               dev = dev->bus->self;
+       }
+       *pinp = pin;
+
+       return PCI_SLOT(dev->devfn);
+}
+
+static int __init visws_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+       int irq, bus = dev->bus->number;
+
+       pin--;
+
+       /* Nothing useful at PIIX4 pin 1 */
+       if (bus == pci_bus0 && slot == 4 && pin == 0)
+               return -1;
+
+       /* PIIX4 USB is on Bus 0, Slot 4, Line 3 */
+       if (bus == pci_bus0 && slot == 4 && pin == 3) {
+               irq = CO_IRQ(CO_APIC_PIIX4_USB);
+               goto out;
+       }
+
+       /* First pin spread down 1 APIC entry per slot */
+       if (pin == 0) {
+               irq = CO_IRQ((bus == pci_bus0 ? CO_APIC_PCIB_BASE0 :
+                                               CO_APIC_PCIA_BASE0) + slot);
+               goto out;
+       }
+
+       /* lines 1,2,3 from any slot is shared in this twirly pattern */
+       if (bus == pci_bus1) {
+               /* lines 1-3 from devices 0 1 rotate over 2 apic entries */
+               irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((slot + (pin - 1)) % 2));
+       } else { /* bus == pci_bus0 */
+               /* lines 1-3 from devices 0-3 rotate over 3 apic entries */
+               if (slot == 0)
+                       slot = 3; /* same pattern */
+               irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((3 - slot) + (pin - 1) % 3));
+       }
+out:
+       printk(KERN_DEBUG "PCI: Bus %d Slot %d Line %d -> IRQ %d\n", bus, slot, pin, irq);
+       return irq;
+}
+
+void __init pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+       pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+}
+
+static int __init pcibios_init(void)
+{
+       /* The VISWS supports configuration access type 1 only */
+       pci_probe = (pci_probe | PCI_PROBE_CONF1) &
+                   ~(PCI_PROBE_BIOS | PCI_PROBE_CONF2);
+
+       pci_bus0 = li_pcib_read16(LI_PCI_BUSNUM) & 0xff;
+       pci_bus1 = li_pcia_read16(LI_PCI_BUSNUM) & 0xff;
+
+       printk(KERN_INFO "PCI: Lithium bridge A bus: %u, "
+               "bridge B (PIIX4) bus: %u\n", pci_bus1, pci_bus0);
+
+       raw_pci_ops = &pci_direct_conf1;
+       pci_scan_bus_with_sysdata(pci_bus0);
+       pci_scan_bus_with_sysdata(pci_bus1);
+       pci_fixup_irqs(visws_swizzle, visws_map_irq);
+       pcibios_resource_survey();
+       return 0;
+}
+
+subsys_initcall(pcibios_init);