/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2003 Christoph Hellwig (hch@lst.de) * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org) * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/pci.h> #include <asm/sn/arch.h> #include <asm/pci/bridge.h> #include <asm/paccess.h> #include <asm/sn/intr.h> #include <asm/sn/sn0/hub.h> /* * Max #PCI busses we can handle; ie, max #PCI bridges. */ #define MAX_PCI_BUSSES 40 /* * Max #PCI devices (like scsi controllers) we handle on a bus. */ #define MAX_DEVICES_PER_PCIBUS 8 /* * XXX: No kmalloc available when we do our crosstalk scan, * we should try to move it later in the boot process. */ static struct bridge_controller bridges[MAX_PCI_BUSSES]; /* * Translate from irq to software PCI bus number and PCI slot. */ struct bridge_controller *irq_to_bridge[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS]; int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS]; extern struct pci_ops bridge_pci_ops; int __init bridge_probe(nasid_t nasid, int widget_id, int masterwid) { unsigned long offset = NODE_OFFSET(nasid); struct bridge_controller *bc; static int num_bridges = 0; bridge_t *bridge; int slot; printk("a bridge\n"); /* XXX: kludge alert.. */ if (!num_bridges) ioport_resource.end = ~0UL; bc = &bridges[num_bridges]; bc->pc.pci_ops = &bridge_pci_ops; bc->pc.mem_resource = &bc->mem; bc->pc.io_resource = &bc->io; bc->pc.index = num_bridges; bc->mem.name = "Bridge PCI MEM"; bc->pc.mem_offset = offset; bc->mem.start = 0; bc->mem.end = ~0UL; bc->mem.flags = IORESOURCE_MEM; bc->io.name = "Bridge IO MEM"; bc->pc.io_offset = offset; bc->io.start = 0UL; bc->io.end = ~0UL; bc->io.flags = IORESOURCE_IO; bc->irq_cpu = smp_processor_id(); bc->widget_id = widget_id; bc->nasid = nasid; bc->baddr = (u64)masterwid << 60 | PCI64_ATTR_BAR; /* * point to this bridge */ bridge = (bridge_t *) RAW_NODE_SWIN_BASE(nasid, widget_id); /* * Clear all pending interrupts. */ bridge->b_int_rst_stat = BRIDGE_IRR_ALL_CLR; /* * Until otherwise set up, assume all interrupts are from slot 0 */ bridge->b_int_device = 0x0; /* * swap pio's to pci mem and io space (big windows) */ bridge->b_wid_control |= BRIDGE_CTRL_IO_SWAP | BRIDGE_CTRL_MEM_SWAP; /* * Hmm... IRIX sets additional bits in the address which * are documented as reserved in the bridge docs. */ bridge->b_wid_int_upper = 0x8000 | (masterwid << 16); bridge->b_wid_int_lower = 0x01800090; /* PI_INT_PEND_MOD off*/ bridge->b_dir_map = (masterwid << 20); /* DMA */ bridge->b_int_enable = 0; for (slot = 0; slot < 8; slot ++) { bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR; bc->pci_int[slot] = -1; } bridge->b_wid_tflush; /* wait until Bridge PIO complete */ bc->base = bridge; register_pci_controller(&bc->pc); num_bridges++; return 0; } /* * All observed requests have pin == 1. We could have a global here, that * gets incremented and returned every time - unfortunately, pci_map_irq * may be called on the same device over and over, and need to return the * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7]. * * A given PCI device, in general, should be able to intr any of the cpus * on any one of the hubs connected to its xbow. */ int __devinit pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin) { struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus); int irq = bc->pci_int[slot]; if (irq == -1) { irq = bc->pci_int[slot] = request_bridge_irq(bc); if (irq < 0) panic("Can't allocate interrupt for PCI device %s\n", pci_name(dev)); } irq_to_bridge[irq] = bc; irq_to_slot[irq] = slot; return irq; } /* Do platform specific device initialization at pci_enable_device() time */ int pcibios_plat_dev_init(struct pci_dev *dev) { return 0; } /* * Device might live on a subordinate PCI bus. XXX Walk up the chain of buses * to find the slot number in sense of the bridge device register. * XXX This also means multiple devices might rely on conflicting bridge * settings. */ static inline void pci_disable_swapping(struct pci_dev *dev) { struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus); bridge_t *bridge = bc->base; int slot = PCI_SLOT(dev->devfn); /* Turn off byte swapping */ bridge->b_device[slot].reg &= ~BRIDGE_DEV_SWAP_DIR; bridge->b_widget.w_tflush; /* Flush */ } static inline void pci_enable_swapping(struct pci_dev *dev) { struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus); bridge_t *bridge = bc->base; int slot = PCI_SLOT(dev->devfn); /* Turn on byte swapping */ bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR; bridge->b_widget.w_tflush; /* Flush */ } static void __init pci_fixup_ioc3(struct pci_dev *d) { pci_disable_swapping(d); } int pcibus_to_node(struct pci_bus *bus) { struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); return bc->nasid; } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, pci_fixup_ioc3);