/* * linux/arch/arm/kernel/bios32.c * * PCI bios-type initialisation for PCI machines * * Bits taken from various places. */ #include #include #include #include #include #include #include #include #include static int debug_pci; static int use_firmware; /* * We can't use pci_find_device() here since we are * called from interrupt context. */ static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask, int warn) { struct pci_dev *dev; list_for_each_entry(dev, &bus->devices, bus_list) { u16 status; /* * ignore host bridge - we handle * that separately */ if (dev->bus->number == 0 && dev->devfn == 0) continue; pci_read_config_word(dev, PCI_STATUS, &status); if (status == 0xffff) continue; if ((status & status_mask) == 0) continue; /* clear the status errors */ pci_write_config_word(dev, PCI_STATUS, status & status_mask); if (warn) printk("(%s: %04X) ", pci_name(dev), status); } list_for_each_entry(dev, &bus->devices, bus_list) if (dev->subordinate) pcibios_bus_report_status(dev->subordinate, status_mask, warn); } void pcibios_report_status(u_int status_mask, int warn) { struct list_head *l; list_for_each(l, &pci_root_buses) { struct pci_bus *bus = pci_bus_b(l); pcibios_bus_report_status(bus, status_mask, warn); } } /* * We don't use this to fix the device, but initialisation of it. * It's not the correct use for this, but it works. * Note that the arbiter/ISA bridge appears to be buggy, specifically in * the following area: * 1. park on CPU * 2. ISA bridge ping-pong * 3. ISA bridge master handling of target RETRY * * Bug 3 is responsible for the sound DMA grinding to a halt. We now * live with bug 2. */ static void __devinit pci_fixup_83c553(struct pci_dev *dev) { /* * Set memory region to start at address 0, and enable IO */ pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY); pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO); dev->resource[0].end -= dev->resource[0].start; dev->resource[0].start = 0; /* * All memory requests from ISA to be channelled to PCI */ pci_write_config_byte(dev, 0x48, 0xff); /* * Enable ping-pong on bus master to ISA bridge transactions. * This improves the sound DMA substantially. The fixed * priority arbiter also helps (see below). */ pci_write_config_byte(dev, 0x42, 0x01); /* * Enable PCI retry */ pci_write_config_byte(dev, 0x40, 0x22); /* * We used to set the arbiter to "park on last master" (bit * 1 set), but unfortunately the CyberPro does not park the * bus. We must therefore park on CPU. Unfortunately, this * may trigger yet another bug in the 553. */ pci_write_config_byte(dev, 0x83, 0x02); /* * Make the ISA DMA request lowest priority, and disable * rotating priorities completely. */ pci_write_config_byte(dev, 0x80, 0x11); pci_write_config_byte(dev, 0x81, 0x00); /* * Route INTA input to IRQ 11, and set IRQ11 to be level * sensitive. */ pci_write_config_word(dev, 0x44, 0xb000); outb(0x08, 0x4d1); } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, pci_fixup_83c553); static void __devinit pci_fixup_unassign(struct pci_dev *dev) { dev->resource[0].end -= dev->resource[0].start; dev->resource[0].start = 0; } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F, pci_fixup_unassign); /* * Prevent the PCI layer from seeing the resources allocated to this device * if it is the host bridge by marking it as such. These resources are of * no consequence to the PCI layer (they are handled elsewhere). */ static void __devinit pci_fixup_dec21285(struct pci_dev *dev) { int i; if (dev->devfn == 0) { dev->class &= 0xff; dev->class |= PCI_CLASS_BRIDGE_HOST << 8; for (i = 0; i < PCI_NUM_RESOURCES; i++) { dev->resource[i].start = 0; dev->resource[i].end = 0; dev->resource[i].flags = 0; } } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_dec21285); /* * Same as above. The PrPMC800 carrier board for the PrPMC1100 * card maps the host-bridge @ 00:01:00 for some reason and it * ends up getting scanned. Note that we only want to do this * fixup when we find the IXP4xx on a PrPMC system, which is why * we check the machine type. We could be running on a board * with an IXP4xx target device and we don't want to kill the * resources in that case. */ static void __devinit pci_fixup_prpmc1100(struct pci_dev *dev) { int i; if (machine_is_prpmc1100()) { dev->class &= 0xff; dev->class |= PCI_CLASS_BRIDGE_HOST << 8; for (i = 0; i < PCI_NUM_RESOURCES; i++) { dev->resource[i].start = 0; dev->resource[i].end = 0; dev->resource[i].flags = 0; } } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP4XX, pci_fixup_prpmc1100); /* * PCI IDE controllers use non-standard I/O port decoding, respect it. */ static void __devinit pci_fixup_ide_bases(struct pci_dev *dev) { struct resource *r; int i; if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) return; for (i = 0; i < PCI_NUM_RESOURCES; i++) { r = dev->resource + i; if ((r->start & ~0x80) == 0x374) { r->start |= 2; r->end = r->start; } } } DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases); /* * Put the DEC21142 to sleep */ static void __devinit pci_fixup_dec21142(struct pci_dev *dev) { pci_write_config_dword(dev, 0x40, 0x80000000); } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142, pci_fixup_dec21142); /* * The CY82C693 needs some rather major fixups to ensure that it does * the right thing. Idea from the Alpha people, with a few additions. * * We ensure that the IDE base registers are set to 1f0/3f4 for the * primary bus, and 170/374 for the secondary bus. Also, hide them * from the PCI subsystem view as well so we won't try to perform * our own auto-configuration on them. * * In addition, we ensure that the PCI IDE interrupts are routed to * IRQ 14 and IRQ 15 respectively. * * The above gets us to a point where the IDE on this device is * functional. However, The CY82C693U _does not work_ in bus * master mode without locking the PCI bus solid. */ static void __devinit pci_fixup_cy82c693(struct pci_dev *dev) { if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) { u32 base0, base1; if (dev->class & 0x80) { /* primary */ base0 = 0x1f0; base1 = 0x3f4; } else { /* secondary */ base0 = 0x170; base1 = 0x374; } pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, base0 | PCI_BASE_ADDRESS_SPACE_IO); pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, base1 | PCI_BASE_ADDRESS_SPACE_IO); dev->resource[0].start = 0; dev->resource[0].end = 0; dev->resource[0].flags = 0; dev->resource[1].start = 0; dev->resource[1].end = 0; dev->resource[1].flags = 0; } else if (PCI_FUNC(dev->devfn) == 0) { /* * Setup IDE IRQ routing. */ pci_write_config_byte(dev, 0x4b, 14); pci_write_config_byte(dev, 0x4c, 15); /* * Disable FREQACK handshake, enable USB. */ pci_write_config_byte(dev, 0x4d, 0x41); /* * Enable PCI retry, and PCI post-write buffer. */ pci_write_config_byte(dev, 0x44, 0x17); /* * Enable ISA master and DMA post write buffering. */ pci_write_config_byte(dev, 0x45, 0x03); } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, pci_fixup_cy82c693); void __devinit pcibios_update_irq(struct pci_dev *dev, int irq) { if (debug_pci) printk("PCI: Assigning IRQ %02d to %s\n", irq, pci_name(dev)); pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); } /* * If the bus contains any of these devices, then we must not turn on * parity checking of any kind. Currently this is CyberPro 20x0 only. */ static inline int pdev_bad_for_parity(struct pci_dev *dev) { return (dev->vendor == PCI_VENDOR_ID_INTERG && (dev->device == PCI_DEVICE_ID_INTERG_2000 || dev->device == PCI_DEVICE_ID_INTERG_2010)); } /* * Adjust the device resources from bus-centric to Linux-centric. */ static void __devinit pdev_fixup_device_resources(struct pci_sys_data *root, struct pci_dev *dev) { unsigned long offset; int i; for (i = 0; i < PCI_NUM_RESOURCES; i++) { if (dev->resource[i].start == 0) continue; if (dev->resource[i].flags & IORESOURCE_MEM) offset = root->mem_offset; else offset = root->io_offset; dev->resource[i].start += offset; dev->resource[i].end += offset; } } static void __devinit pbus_assign_bus_resources(struct pci_bus *bus, struct pci_sys_data *root) { struct pci_dev *dev = bus->self; int i; if (!dev) { /* * Assign root bus resources. */ for (i = 0; i < 3; i++) bus->resource[i] = root->resource[i]; } } /* * pcibios_fixup_bus - Called after each bus is probed, * but before its children are examined. */ void __devinit pcibios_fixup_bus(struct pci_bus *bus) { struct pci_sys_data *root = bus->sysdata; struct pci_dev *dev; u16 features = PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_FAST_BACK; pbus_assign_bus_resources(bus, root); /* * Walk the devices on this bus, working out what we can * and can't support. */ list_for_each_entry(dev, &bus->devices, bus_list) { u16 status; pdev_fixup_device_resources(root, dev); pci_read_config_word(dev, PCI_STATUS, &status); /* * If any device on this bus does not support fast back * to back transfers, then the bus as a whole is not able * to support them. Having fast back to back transfers * on saves us one PCI cycle per transaction. */ if (!(status & PCI_STATUS_FAST_BACK)) features &= ~PCI_COMMAND_FAST_BACK; if (pdev_bad_for_parity(dev)) features &= ~(PCI_COMMAND_SERR | PCI_COMMAND_PARITY); switch (dev->class >> 8) { #if defined(CONFIG_ISA) || defined(CONFIG_EISA) case PCI_CLASS_BRIDGE_ISA: case PCI_CLASS_BRIDGE_EISA: /* * If this device is an ISA bridge, set isa_bridge * to point at this device. We will then go looking * for things like keyboard, etc. */ isa_bridge = dev; break; #endif case PCI_CLASS_BRIDGE_PCI: pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status); status |= PCI_BRIDGE_CTL_PARITY|PCI_BRIDGE_CTL_MASTER_ABORT; status &= ~(PCI_BRIDGE_CTL_BUS_RESET|PCI_BRIDGE_CTL_FAST_BACK); pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status); break; case PCI_CLASS_BRIDGE_CARDBUS: pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL, &status); status |= PCI_CB_BRIDGE_CTL_PARITY|PCI_CB_BRIDGE_CTL_MASTER_ABORT; pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL, status); break; } } /* * Now walk the devices again, this time setting them up. */ list_for_each_entry(dev, &bus->devices, bus_list) { u16 cmd; pci_read_config_word(dev, PCI_COMMAND, &cmd); cmd |= features; pci_write_config_word(dev, PCI_COMMAND, cmd); pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, L1_CACHE_BYTES >> 2); } /* * Propagate the flags to the PCI bridge. */ if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) { if (features & PCI_COMMAND_FAST_BACK) bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK; if (features & PCI_COMMAND_PARITY) bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY; } /* * Report what we did for this bus */ printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n", bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis"); } /* * Convert from Linux-centric to bus-centric addresses for bridge devices. */ void __devinit pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, struct resource *res) { struct pci_sys_data *root = dev->sysdata; unsigned long offset = 0; if (res->flags & IORESOURCE_IO) offset = root->io_offset; if (res->flags & IORESOURCE_MEM) offset = root->mem_offset; region->start = res->start - offset; region->end = res->end - offset; } void __devinit pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, struct pci_bus_region *region) { struct pci_sys_data *root = dev->sysdata; unsigned long offset = 0; if (res->flags & IORESOURCE_IO) offset = root->io_offset; if (res->flags & IORESOURCE_MEM) offset = root->mem_offset; res->start = region->start + offset; res->end = region->end + offset; } #ifdef CONFIG_HOTPLUG EXPORT_SYMBOL(pcibios_fixup_bus); EXPORT_SYMBOL(pcibios_resource_to_bus); EXPORT_SYMBOL(pcibios_bus_to_resource); #endif /* * This is the standard PCI-PCI bridge swizzling algorithm: * * Dev: 0 1 2 3 * A A B C D * B B C D A * C C D A B * D D A B C * ^^^^^^^^^^ irq pin on bridge */ u8 __devinit pci_std_swizzle(struct pci_dev *dev, u8 *pinp) { int pin = *pinp - 1; while (dev->bus->self) { pin = (pin + PCI_SLOT(dev->devfn)) & 3; /* * move up the chain of bridges, * swizzling as we go. */ dev = dev->bus->self; } *pinp = pin + 1; return PCI_SLOT(dev->devfn); } /* * Swizzle the device pin each time we cross a bridge. * This might update pin and returns the slot number. */ static u8 __devinit pcibios_swizzle(struct pci_dev *dev, u8 *pin) { struct pci_sys_data *sys = dev->sysdata; int slot = 0, oldpin = *pin; if (sys->swizzle) slot = sys->swizzle(dev, pin); if (debug_pci) printk("PCI: %s swizzling pin %d => pin %d slot %d\n", pci_name(dev), oldpin, *pin, slot); return slot; } /* * Map a slot/pin to an IRQ. */ static int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin) { struct pci_sys_data *sys = dev->sysdata; int irq = -1; if (sys->map_irq) irq = sys->map_irq(dev, slot, pin); if (debug_pci) printk("PCI: %s mapping slot %d pin %d => irq %d\n", pci_name(dev), slot, pin, irq); return irq; } static void __init pcibios_init_hw(struct hw_pci *hw) { struct pci_sys_data *sys = NULL; int ret; int nr, busnr; for (nr = busnr = 0; nr < hw->nr_controllers; nr++) { sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL); if (!sys) panic("PCI: unable to allocate sys data!"); sys->hw = hw; sys->busnr = busnr; sys->swizzle = hw->swizzle; sys->map_irq = hw->map_irq; sys->resource[0] = &ioport_resource; sys->resource[1] = &iomem_resource; ret = hw->setup(nr, sys); if (ret > 0) { sys->bus = hw->scan(nr, sys); if (!sys->bus) panic("PCI: unable to scan bus!"); busnr = sys->bus->subordinate + 1; list_add(&sys->node, &hw->buses); } else { kfree(sys); if (ret < 0) break; } } } void __init pci_common_init(struct hw_pci *hw) { struct pci_sys_data *sys; INIT_LIST_HEAD(&hw->buses); if (hw->preinit) hw->preinit(); pcibios_init_hw(hw); if (hw->postinit) hw->postinit(); pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq); list_for_each_entry(sys, &hw->buses, node) { struct pci_bus *bus = sys->bus; if (!use_firmware) { /* * Size the bridge windows. */ pci_bus_size_bridges(bus); /* * Assign resources. */ pci_bus_assign_resources(bus); } /* * Tell drivers about devices found. */ pci_bus_add_devices(bus); } } char * __init pcibios_setup(char *str) { if (!strcmp(str, "debug")) { debug_pci = 1; return NULL; } else if (!strcmp(str, "firmware")) { use_firmware = 1; return NULL; } return str; } /* * From arch/i386/kernel/pci-i386.c: * * We need to avoid collisions with `mirrored' VGA ports * and other strange ISA hardware, so we always want the * addresses to be allocated in the 0x000-0x0ff region * modulo 0x400. * * Why? Because some silly external IO cards only decode * the low 10 bits of the IO address. The 0x00-0xff region * is reserved for motherboard devices that decode all 16 * bits, so it's ok to allocate at, say, 0x2800-0x28ff, * but we want to try to avoid allocating at 0x2900-0x2bff * which might be mirrored at 0x0100-0x03ff.. */ void pcibios_align_resource(void *data, struct resource *res, unsigned long size, unsigned long align) { unsigned long start = res->start; if (res->flags & IORESOURCE_IO && start & 0x300) start = (start + 0x3ff) & ~0x3ff; res->start = (start + align - 1) & ~(align - 1); } /** * pcibios_enable_device - Enable I/O and memory. * @dev: PCI device to be enabled */ int pcibios_enable_device(struct pci_dev *dev, int mask) { u16 cmd, old_cmd; int idx; struct resource *r; pci_read_config_word(dev, PCI_COMMAND, &cmd); old_cmd = cmd; for (idx = 0; idx < 6; idx++) { /* Only set up the requested stuff */ if (!(mask & (1 << idx))) continue; r = dev->resource + idx; if (!r->start && r->end) { printk(KERN_ERR "PCI: Device %s not available because" " of resource collisions\n", pci_name(dev)); return -EINVAL; } if (r->flags & IORESOURCE_IO) cmd |= PCI_COMMAND_IO; if (r->flags & IORESOURCE_MEM) cmd |= PCI_COMMAND_MEMORY; } /* * Bridges (eg, cardbus bridges) need to be fully enabled */ if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY; if (cmd != old_cmd) { printk("PCI: enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd); pci_write_config_word(dev, PCI_COMMAND, cmd); } return 0; } int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine) { struct pci_sys_data *root = dev->sysdata; unsigned long phys; if (mmap_state == pci_mmap_io) { return -EINVAL; } else { phys = vma->vm_pgoff + (root->mem_offset >> PAGE_SHIFT); } /* * Mark this as IO */ vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO; vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); if (remap_pfn_range(vma, vma->vm_start, phys, vma->vm_end - vma->vm_start, vma->vm_page_prot)) return -EAGAIN; return 0; }