/* * Common prep/chrp pci routines. -- Cort */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/string.h> #include <linux/init.h> #include <linux/capability.h> #include <linux/sched.h> #include <linux/errno.h> #include <linux/bootmem.h> #include <asm/processor.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/sections.h> #include <asm/pci-bridge.h> #include <asm/byteorder.h> #include <asm/irq.h> #include <asm/uaccess.h> #include <asm/machdep.h> #undef DEBUG #ifdef DEBUG #define DBG(x...) printk(x) #else #define DBG(x...) #endif unsigned long isa_io_base = 0; unsigned long isa_mem_base = 0; unsigned long pci_dram_offset = 0; int pcibios_assign_bus_offset = 1; void pcibios_make_OF_bus_map(void); static int pci_relocate_bridge_resource(struct pci_bus *bus, int i); static int probe_resource(struct pci_bus *parent, struct resource *pr, struct resource *res, struct resource **conflict); static void update_bridge_base(struct pci_bus *bus, int i); static void pcibios_fixup_resources(struct pci_dev* dev); static void fixup_broken_pcnet32(struct pci_dev* dev); static int reparent_resources(struct resource *parent, struct resource *res); static void fixup_cpc710_pci64(struct pci_dev* dev); /* By default, we don't re-assign bus numbers. */ int pci_assign_all_buses; struct pci_controller* hose_head; struct pci_controller** hose_tail = &hose_head; static int pci_bus_count; static void fixup_broken_pcnet32(struct pci_dev* dev) { if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) { dev->vendor = PCI_VENDOR_ID_AMD; pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD); } } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID, fixup_broken_pcnet32); static void fixup_cpc710_pci64(struct pci_dev* dev) { /* Hide the PCI64 BARs from the kernel as their content doesn't * fit well in the resource management */ dev->resource[0].start = dev->resource[0].end = 0; dev->resource[0].flags = 0; dev->resource[1].start = dev->resource[1].end = 0; dev->resource[1].flags = 0; } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CPC710_PCI64, fixup_cpc710_pci64); static void pcibios_fixup_resources(struct pci_dev *dev) { struct pci_controller* hose = (struct pci_controller *)dev->sysdata; int i; unsigned long offset; if (!hose) { printk(KERN_ERR "No hose for PCI dev %s!\n", pci_name(dev)); return; } for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { struct resource *res = dev->resource + i; if (!res->flags) continue; if (res->end == 0xffffffff) { DBG("PCI:%s Resource %d [%016llx-%016llx] is unassigned\n", pci_name(dev), i, (unsigned long long)res->start, (unsigned long long)res->end); res->end -= res->start; res->start = 0; res->flags |= IORESOURCE_UNSET; continue; } offset = 0; if (res->flags & IORESOURCE_MEM) { offset = hose->pci_mem_offset; } else if (res->flags & IORESOURCE_IO) { offset = (unsigned long) hose->io_base_virt - isa_io_base; } if (offset != 0) { res->start += offset; res->end += offset; #ifdef DEBUG printk("Fixup res %d (%lx) of dev %s: %lx -> %lx\n", i, res->flags, pci_name(dev), res->start - offset, res->start); #endif } } /* Call machine specific resource fixup */ if (ppc_md.pcibios_fixup_resources) ppc_md.pcibios_fixup_resources(dev); } DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources); void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, struct resource *res) { unsigned long offset = 0; struct pci_controller *hose = dev->sysdata; if (hose && res->flags & IORESOURCE_IO) offset = (unsigned long)hose->io_base_virt - isa_io_base; else if (hose && res->flags & IORESOURCE_MEM) offset = hose->pci_mem_offset; region->start = res->start - offset; region->end = res->end - offset; } EXPORT_SYMBOL(pcibios_resource_to_bus); void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, struct pci_bus_region *region) { unsigned long offset = 0; struct pci_controller *hose = dev->sysdata; if (hose && res->flags & IORESOURCE_IO) offset = (unsigned long)hose->io_base_virt - isa_io_base; else if (hose && res->flags & IORESOURCE_MEM) offset = hose->pci_mem_offset; res->start = region->start + offset; res->end = region->end + offset; } EXPORT_SYMBOL(pcibios_bus_to_resource); /* * 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 have be mirrored at 0x0100-0x03ff.. */ void pcibios_align_resource(void *data, struct resource *res, unsigned long size, unsigned long align) { struct pci_dev *dev = data; if (res->flags & IORESOURCE_IO) { unsigned long start = res->start; if (size > 0x100) { printk(KERN_ERR "PCI: I/O Region %s/%d too large" " (%lld bytes)\n", pci_name(dev), dev->resource - res, (unsigned long long)size); } if (start & 0x300) { start = (start + 0x3ff) & ~0x3ff; res->start = start; } } } EXPORT_SYMBOL(pcibios_align_resource); /* * Handle resources of PCI devices. If the world were perfect, we could * just allocate all the resource regions and do nothing more. It isn't. * On the other hand, we cannot just re-allocate all devices, as it would * require us to know lots of host bridge internals. So we attempt to * keep as much of the original configuration as possible, but tweak it * when it's found to be wrong. * * Known BIOS problems we have to work around: * - I/O or memory regions not configured * - regions configured, but not enabled in the command register * - bogus I/O addresses above 64K used * - expansion ROMs left enabled (this may sound harmless, but given * the fact the PCI specs explicitly allow address decoders to be * shared between expansion ROMs and other resource regions, it's * at least dangerous) * * Our solution: * (1) Allocate resources for all buses behind PCI-to-PCI bridges. * This gives us fixed barriers on where we can allocate. * (2) Allocate resources for all enabled devices. If there is * a collision, just mark the resource as unallocated. Also * disable expansion ROMs during this step. * (3) Try to allocate resources for disabled devices. If the * resources were assigned correctly, everything goes well, * if they weren't, they won't disturb allocation of other * resources. * (4) Assign new addresses to resources which were either * not configured at all or misconfigured. If explicitly * requested by the user, configure expansion ROM address * as well. */ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list) { struct pci_bus *bus; int i; struct resource *res, *pr; /* Depth-First Search on bus tree */ list_for_each_entry(bus, bus_list, node) { for (i = 0; i < 4; ++i) { if ((res = bus->resource[i]) == NULL || !res->flags || res->start > res->end) continue; if (bus->parent == NULL) pr = (res->flags & IORESOURCE_IO)? &ioport_resource: &iomem_resource; else { pr = pci_find_parent_resource(bus->self, res); if (pr == res) { /* this happens when the generic PCI * code (wrongly) decides that this * bridge is transparent -- paulus */ continue; } } DBG("PCI: bridge rsrc %llx..%llx (%lx), parent %p\n", (unsigned long long)res->start, (unsigned long long)res->end, res->flags, pr); if (pr) { if (request_resource(pr, res) == 0) continue; /* * Must be a conflict with an existing entry. * Move that entry (or entries) under the * bridge resource and try again. */ if (reparent_resources(pr, res) == 0) continue; } printk(KERN_ERR "PCI: Cannot allocate resource region " "%d of PCI bridge %d\n", i, bus->number); if (pci_relocate_bridge_resource(bus, i)) bus->resource[i] = NULL; } pcibios_allocate_bus_resources(&bus->children); } } /* * Reparent resource children of pr that conflict with res * under res, and make res replace those children. */ static int __init reparent_resources(struct resource *parent, struct resource *res) { struct resource *p, **pp; struct resource **firstpp = NULL; for (pp = &parent->child; (p = *pp) != NULL; pp = &p->sibling) { if (p->end < res->start) continue; if (res->end < p->start) break; if (p->start < res->start || p->end > res->end) return -1; /* not completely contained */ if (firstpp == NULL) firstpp = pp; } if (firstpp == NULL) return -1; /* didn't find any conflicting entries? */ res->parent = parent; res->child = *firstpp; res->sibling = *pp; *firstpp = res; *pp = NULL; for (p = res->child; p != NULL; p = p->sibling) { p->parent = res; DBG(KERN_INFO "PCI: reparented %s [%llx..%llx] under %s\n", p->name, (unsigned long long)p->start, (unsigned long long)p->end, res->name); } return 0; } /* * A bridge has been allocated a range which is outside the range * of its parent bridge, so it needs to be moved. */ static int __init pci_relocate_bridge_resource(struct pci_bus *bus, int i) { struct resource *res, *pr, *conflict; unsigned long try, size; int j; struct pci_bus *parent = bus->parent; if (parent == NULL) { /* shouldn't ever happen */ printk(KERN_ERR "PCI: can't move host bridge resource\n"); return -1; } res = bus->resource[i]; if (res == NULL) return -1; pr = NULL; for (j = 0; j < 4; j++) { struct resource *r = parent->resource[j]; if (!r) continue; if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM)) continue; if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH)) { pr = r; break; } if (res->flags & IORESOURCE_PREFETCH) pr = r; } if (pr == NULL) return -1; size = res->end - res->start; if (pr->start > pr->end || size > pr->end - pr->start) return -1; try = pr->end; for (;;) { res->start = try - size; res->end = try; if (probe_resource(bus->parent, pr, res, &conflict) == 0) break; if (conflict->start <= pr->start + size) return -1; try = conflict->start - 1; } if (request_resource(pr, res)) { DBG(KERN_ERR "PCI: huh? couldn't move to %llx..%llx\n", (unsigned long long)res->start, (unsigned long long)res->end); return -1; /* "can't happen" */ } update_bridge_base(bus, i); printk(KERN_INFO "PCI: bridge %d resource %d moved to %llx..%llx\n", bus->number, i, (unsigned long long)res->start, (unsigned long long)res->end); return 0; } static int __init probe_resource(struct pci_bus *parent, struct resource *pr, struct resource *res, struct resource **conflict) { struct pci_bus *bus; struct pci_dev *dev; struct resource *r; int i; for (r = pr->child; r != NULL; r = r->sibling) { if (r->end >= res->start && res->end >= r->start) { *conflict = r; return 1; } } list_for_each_entry(bus, &parent->children, node) { for (i = 0; i < 4; ++i) { if ((r = bus->resource[i]) == NULL) continue; if (!r->flags || r->start > r->end || r == res) continue; if (pci_find_parent_resource(bus->self, r) != pr) continue; if (r->end >= res->start && res->end >= r->start) { *conflict = r; return 1; } } } list_for_each_entry(dev, &parent->devices, bus_list) { for (i = 0; i < 6; ++i) { r = &dev->resource[i]; if (!r->flags || (r->flags & IORESOURCE_UNSET)) continue; if (pci_find_parent_resource(dev, r) != pr) continue; if (r->end >= res->start && res->end >= r->start) { *conflict = r; return 1; } } } return 0; } static void __init update_bridge_base(struct pci_bus *bus, int i) { struct resource *res = bus->resource[i]; u8 io_base_lo, io_limit_lo; u16 mem_base, mem_limit; u16 cmd; unsigned long start, end, off; struct pci_dev *dev = bus->self; struct pci_controller *hose = dev->sysdata; if (!hose) { printk("update_bridge_base: no hose?\n"); return; } pci_read_config_word(dev, PCI_COMMAND, &cmd); pci_write_config_word(dev, PCI_COMMAND, cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)); if (res->flags & IORESOURCE_IO) { off = (unsigned long) hose->io_base_virt - isa_io_base; start = res->start - off; end = res->end - off; io_base_lo = (start >> 8) & PCI_IO_RANGE_MASK; io_limit_lo = (end >> 8) & PCI_IO_RANGE_MASK; if (end > 0xffff) { pci_write_config_word(dev, PCI_IO_BASE_UPPER16, start >> 16); pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16, end >> 16); io_base_lo |= PCI_IO_RANGE_TYPE_32; } else io_base_lo |= PCI_IO_RANGE_TYPE_16; pci_write_config_byte(dev, PCI_IO_BASE, io_base_lo); pci_write_config_byte(dev, PCI_IO_LIMIT, io_limit_lo); } else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH)) == IORESOURCE_MEM) { off = hose->pci_mem_offset; mem_base = ((res->start - off) >> 16) & PCI_MEMORY_RANGE_MASK; mem_limit = ((res->end - off) >> 16) & PCI_MEMORY_RANGE_MASK; pci_write_config_word(dev, PCI_MEMORY_BASE, mem_base); pci_write_config_word(dev, PCI_MEMORY_LIMIT, mem_limit); } else if ((res->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH)) == (IORESOURCE_MEM | IORESOURCE_PREFETCH)) { off = hose->pci_mem_offset; mem_base = ((res->start - off) >> 16) & PCI_PREF_RANGE_MASK; mem_limit = ((res->end - off) >> 16) & PCI_PREF_RANGE_MASK; pci_write_config_word(dev, PCI_PREF_MEMORY_BASE, mem_base); pci_write_config_word(dev, PCI_PREF_MEMORY_LIMIT, mem_limit); } else { DBG(KERN_ERR "PCI: ugh, bridge %s res %d has flags=%lx\n", pci_name(dev), i, res->flags); } pci_write_config_word(dev, PCI_COMMAND, cmd); } static inline void alloc_resource(struct pci_dev *dev, int idx) { struct resource *pr, *r = &dev->resource[idx]; DBG("PCI:%s: Resource %d: %016llx-%016llx (f=%lx)\n", pci_name(dev), idx, (unsigned long long)r->start, (unsigned long long)r->end, r->flags); pr = pci_find_parent_resource(dev, r); if (!pr || request_resource(pr, r) < 0) { printk(KERN_ERR "PCI: Cannot allocate resource region %d" " of device %s\n", idx, pci_name(dev)); if (pr) DBG("PCI: parent is %p: %016llx-%016llx (f=%lx)\n", pr, (unsigned long long)pr->start, (unsigned long long)pr->end, pr->flags); /* We'll assign a new address later */ r->flags |= IORESOURCE_UNSET; r->end -= r->start; r->start = 0; } } static void __init pcibios_allocate_resources(int pass) { struct pci_dev *dev = NULL; int idx, disabled; u16 command; struct resource *r; for_each_pci_dev(dev) { pci_read_config_word(dev, PCI_COMMAND, &command); for (idx = 0; idx < 6; idx++) { r = &dev->resource[idx]; if (r->parent) /* Already allocated */ continue; if (!r->flags || (r->flags & IORESOURCE_UNSET)) continue; /* Not assigned at all */ if (r->flags & IORESOURCE_IO) disabled = !(command & PCI_COMMAND_IO); else disabled = !(command & PCI_COMMAND_MEMORY); if (pass == disabled) alloc_resource(dev, idx); } if (pass) continue; r = &dev->resource[PCI_ROM_RESOURCE]; if (r->flags & IORESOURCE_ROM_ENABLE) { /* Turn the ROM off, leave the resource region, but keep it unregistered. */ u32 reg; DBG("PCI: Switching off ROM of %s\n", pci_name(dev)); r->flags &= ~IORESOURCE_ROM_ENABLE; pci_read_config_dword(dev, dev->rom_base_reg, ®); pci_write_config_dword(dev, dev->rom_base_reg, reg & ~PCI_ROM_ADDRESS_ENABLE); } } } static void __init pcibios_assign_resources(void) { struct pci_dev *dev = NULL; int idx; struct resource *r; for_each_pci_dev(dev) { int class = dev->class >> 8; /* Don't touch classless devices and host bridges */ if (!class || class == PCI_CLASS_BRIDGE_HOST) continue; for (idx = 0; idx < 6; idx++) { r = &dev->resource[idx]; /* * We shall assign a new address to this resource, * either because the BIOS (sic) forgot to do so * or because we have decided the old address was * unusable for some reason. */ if ((r->flags & IORESOURCE_UNSET) && r->end && (!ppc_md.pcibios_enable_device_hook || !ppc_md.pcibios_enable_device_hook(dev, 1))) { r->flags &= ~IORESOURCE_UNSET; pci_assign_resource(dev, idx); } } #if 0 /* don't assign ROMs */ r = &dev->resource[PCI_ROM_RESOURCE]; r->end -= r->start; r->start = 0; if (r->end) pci_assign_resource(dev, PCI_ROM_RESOURCE); #endif } } int pcibios_enable_resources(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->flags & IORESOURCE_UNSET) { 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; } if (dev->resource[PCI_ROM_RESOURCE].start) cmd |= 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; } static int next_controller_index; struct pci_controller * __init pcibios_alloc_controller(void) { struct pci_controller *hose; hose = (struct pci_controller *)alloc_bootmem(sizeof(*hose)); memset(hose, 0, sizeof(struct pci_controller)); *hose_tail = hose; hose_tail = &hose->next; hose->index = next_controller_index++; return hose; } void pcibios_make_OF_bus_map(void) { } /* Add sysfs properties */ void pcibios_add_platform_entries(struct pci_dev *pdev) { } static int __init pcibios_init(void) { struct pci_controller *hose; struct pci_bus *bus; int next_busno; printk(KERN_INFO "PCI: Probing PCI hardware\n"); /* Scan all of the recorded PCI controllers. */ for (next_busno = 0, hose = hose_head; hose; hose = hose->next) { if (pci_assign_all_buses) hose->first_busno = next_busno; hose->last_busno = 0xff; bus = pci_scan_bus(hose->first_busno, hose->ops, hose); hose->last_busno = bus->subordinate; if (pci_assign_all_buses || next_busno <= hose->last_busno) next_busno = hose->last_busno + pcibios_assign_bus_offset; } pci_bus_count = next_busno; /* OpenFirmware based machines need a map of OF bus * numbers vs. kernel bus numbers since we may have to * remap them. */ if (pci_assign_all_buses && have_of) pcibios_make_OF_bus_map(); /* Do machine dependent PCI interrupt routing */ if (ppc_md.pci_swizzle && ppc_md.pci_map_irq) pci_fixup_irqs(ppc_md.pci_swizzle, ppc_md.pci_map_irq); /* Call machine dependent fixup */ if (ppc_md.pcibios_fixup) ppc_md.pcibios_fixup(); /* Allocate and assign resources */ pcibios_allocate_bus_resources(&pci_root_buses); pcibios_allocate_resources(0); pcibios_allocate_resources(1); pcibios_assign_resources(); /* Call machine dependent post-init code */ if (ppc_md.pcibios_after_init) ppc_md.pcibios_after_init(); return 0; } subsys_initcall(pcibios_init); unsigned char __init common_swizzle(struct pci_dev *dev, unsigned char *pinp) { struct pci_controller *hose = dev->sysdata; if (dev->bus->number != hose->first_busno) { u8 pin = *pinp; do { pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn)); /* Move up the chain of bridges. */ dev = dev->bus->self; } while (dev->bus->self); *pinp = pin; /* The slot is the idsel of the last bridge. */ } return PCI_SLOT(dev->devfn); } unsigned long resource_fixup(struct pci_dev * dev, struct resource * res, unsigned long start, unsigned long size) { return start; } void __init pcibios_fixup_bus(struct pci_bus *bus) { struct pci_controller *hose = (struct pci_controller *) bus->sysdata; unsigned long io_offset; struct resource *res; int i; io_offset = (unsigned long)hose->io_base_virt - isa_io_base; if (bus->parent == NULL) { /* This is a host bridge - fill in its resources */ hose->bus = bus; bus->resource[0] = res = &hose->io_resource; if (!res->flags) { if (io_offset) printk(KERN_ERR "I/O resource not set for host" " bridge %d\n", hose->index); res->start = 0; res->end = IO_SPACE_LIMIT; res->flags = IORESOURCE_IO; } res->start += io_offset; res->end += io_offset; for (i = 0; i < 3; ++i) { res = &hose->mem_resources[i]; if (!res->flags) { if (i > 0) continue; printk(KERN_ERR "Memory resource not set for " "host bridge %d\n", hose->index); res->start = hose->pci_mem_offset; res->end = ~0U; res->flags = IORESOURCE_MEM; } bus->resource[i+1] = res; } } else { /* This is a subordinate bridge */ pci_read_bridge_bases(bus); for (i = 0; i < 4; ++i) { if ((res = bus->resource[i]) == NULL) continue; if (!res->flags) continue; if (io_offset && (res->flags & IORESOURCE_IO)) { res->start += io_offset; res->end += io_offset; } else if (hose->pci_mem_offset && (res->flags & IORESOURCE_MEM)) { res->start += hose->pci_mem_offset; res->end += hose->pci_mem_offset; } } } if (ppc_md.pcibios_fixup_bus) ppc_md.pcibios_fixup_bus(bus); } char __init *pcibios_setup(char *str) { return str; } /* the next one is stolen from the alpha port... */ void __init pcibios_update_irq(struct pci_dev *dev, int irq) { pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); /* XXX FIXME - update OF device tree node interrupt property */ } int pcibios_enable_device(struct pci_dev *dev, int mask) { u16 cmd, old_cmd; int idx; struct resource *r; if (ppc_md.pcibios_enable_device_hook) if (ppc_md.pcibios_enable_device_hook(dev, 0)) return -EINVAL; pci_read_config_word(dev, PCI_COMMAND, &cmd); old_cmd = cmd; for (idx=0; idx<6; idx++) { r = &dev->resource[idx]; if (r->flags & IORESOURCE_UNSET) { 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; } 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; } struct pci_controller* pci_bus_to_hose(int bus) { struct pci_controller* hose = hose_head; for (; hose; hose = hose->next) if (bus >= hose->first_busno && bus <= hose->last_busno) return hose; return NULL; } void __iomem * pci_bus_io_base(unsigned int bus) { struct pci_controller *hose; hose = pci_bus_to_hose(bus); if (!hose) return NULL; return hose->io_base_virt; } unsigned long pci_bus_io_base_phys(unsigned int bus) { struct pci_controller *hose; hose = pci_bus_to_hose(bus); if (!hose) return 0; return hose->io_base_phys; } unsigned long pci_bus_mem_base_phys(unsigned int bus) { struct pci_controller *hose; hose = pci_bus_to_hose(bus); if (!hose) return 0; return hose->pci_mem_offset; } unsigned long pci_resource_to_bus(struct pci_dev *pdev, struct resource *res) { /* Hack alert again ! See comments in chrp_pci.c */ struct pci_controller* hose = (struct pci_controller *)pdev->sysdata; if (hose && res->flags & IORESOURCE_MEM) return res->start - hose->pci_mem_offset; /* We may want to do something with IOs here... */ return res->start; } static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, unsigned long *offset, enum pci_mmap_state mmap_state) { struct pci_controller *hose = pci_bus_to_hose(dev->bus->number); unsigned long io_offset = 0; int i, res_bit; if (hose == 0) return NULL; /* should never happen */ /* If memory, add on the PCI bridge address offset */ if (mmap_state == pci_mmap_mem) { *offset += hose->pci_mem_offset; res_bit = IORESOURCE_MEM; } else { io_offset = hose->io_base_virt - ___IO_BASE; *offset += io_offset; res_bit = IORESOURCE_IO; } /* * Check that the offset requested corresponds to one of the * resources of the device. */ for (i = 0; i <= PCI_ROM_RESOURCE; i++) { struct resource *rp = &dev->resource[i]; int flags = rp->flags; /* treat ROM as memory (should be already) */ if (i == PCI_ROM_RESOURCE) flags |= IORESOURCE_MEM; /* Active and same type? */ if ((flags & res_bit) == 0) continue; /* In the range of this resource? */ if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) continue; /* found it! construct the final physical address */ if (mmap_state == pci_mmap_io) *offset += hose->io_base_phys - io_offset; return rp; } return NULL; } /* * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci * device mapping. */ static pgprot_t __pci_mmap_set_pgprot(struct pci_dev *dev, struct resource *rp, pgprot_t protection, enum pci_mmap_state mmap_state, int write_combine) { unsigned long prot = pgprot_val(protection); /* Write combine is always 0 on non-memory space mappings. On * memory space, if the user didn't pass 1, we check for a * "prefetchable" resource. This is a bit hackish, but we use * this to workaround the inability of /sysfs to provide a write * combine bit */ if (mmap_state != pci_mmap_mem) write_combine = 0; else if (write_combine == 0) { if (rp->flags & IORESOURCE_PREFETCH) write_combine = 1; } /* XXX would be nice to have a way to ask for write-through */ prot |= _PAGE_NO_CACHE; if (write_combine) prot &= ~_PAGE_GUARDED; else prot |= _PAGE_GUARDED; printk("PCI map for %s:%llx, prot: %llx\n", pci_name(dev), rp->start, prot); return __pgprot(prot); } /* * This one is used by /dev/mem and fbdev who have no clue about the * PCI device, it tries to find the PCI device first and calls the * above routine */ pgprot_t pci_phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, pgprot_t protection) { struct pci_dev *pdev = NULL; struct resource *found = NULL; unsigned long prot = pgprot_val(protection); unsigned long offset = pfn << PAGE_SHIFT; int i; if (page_is_ram(pfn)) return prot; prot |= _PAGE_NO_CACHE | _PAGE_GUARDED; for_each_pci_dev(pdev) { for (i = 0; i <= PCI_ROM_RESOURCE; i++) { struct resource *rp = &pdev->resource[i]; int flags = rp->flags; /* Active and same type? */ if ((flags & IORESOURCE_MEM) == 0) continue; /* In the range of this resource? */ if (offset < (rp->start & PAGE_MASK) || offset > rp->end) continue; found = rp; break; } if (found) break; } if (found) { if (found->flags & IORESOURCE_PREFETCH) prot &= ~_PAGE_GUARDED; pci_dev_put(pdev); } DBG("non-PCI map for %lx, prot: %lx\n", offset, prot); return __pgprot(prot); } /* * Perform the actual remap of the pages for a PCI device mapping, as * appropriate for this architecture. The region in the process to map * is described by vm_start and vm_end members of VMA, the base physical * address is found in vm_pgoff. * The pci device structure is provided so that architectures may make mapping * decisions on a per-device or per-bus basis. * * Returns a negative error code on failure, zero on success. */ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine) { unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; struct resource *rp; int ret; rp = __pci_mmap_make_offset(dev, &offset, mmap_state); if (rp == NULL) return -EINVAL; vma->vm_pgoff = offset >> PAGE_SHIFT; vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp, vma->vm_page_prot, mmap_state, write_combine); ret = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, vma->vm_end - vma->vm_start, vma->vm_page_prot); return ret; } /* Obsolete functions. Should be removed once the symbios driver * is fixed */ unsigned long phys_to_bus(unsigned long pa) { struct pci_controller *hose; int i; for (hose = hose_head; hose; hose = hose->next) { for (i = 0; i < 3; ++i) { if (pa >= hose->mem_resources[i].start && pa <= hose->mem_resources[i].end) { /* * XXX the hose->pci_mem_offset really * only applies to mem_resources[0]. * We need a way to store an offset for * the others. -- paulus */ if (i == 0) pa -= hose->pci_mem_offset; return pa; } } } /* hmmm, didn't find it */ return 0; } unsigned long pci_phys_to_bus(unsigned long pa, int busnr) { struct pci_controller* hose = pci_bus_to_hose(busnr); if (!hose) return pa; return pa - hose->pci_mem_offset; } unsigned long pci_bus_to_phys(unsigned int ba, int busnr) { struct pci_controller* hose = pci_bus_to_hose(busnr); if (!hose) return ba; return ba + hose->pci_mem_offset; } /* Provide information on locations of various I/O regions in physical * memory. Do this on a per-card basis so that we choose the right * root bridge. * Note that the returned IO or memory base is a physical address */ long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn) { struct pci_controller* hose; long result = -EOPNOTSUPP; hose = pci_bus_to_hose(bus); if (!hose) return -ENODEV; switch (which) { case IOBASE_BRIDGE_NUMBER: return (long)hose->first_busno; case IOBASE_MEMORY: return (long)hose->pci_mem_offset; case IOBASE_IO: return (long)hose->io_base_phys; case IOBASE_ISA_IO: return (long)isa_io_base; case IOBASE_ISA_MEM: return (long)isa_mem_base; } return result; } void pci_resource_to_user(const struct pci_dev *dev, int bar, const struct resource *rsrc, u64 *start, u64 *end) { struct pci_controller *hose = pci_bus_to_hose(dev->bus->number); unsigned long offset = 0; if (hose == NULL) return; if (rsrc->flags & IORESOURCE_IO) offset = ___IO_BASE - hose->io_base_virt + hose->io_base_phys; *start = rsrc->start + offset; *end = rsrc->end + offset; } void __init pci_init_resource(struct resource *res, unsigned long start, unsigned long end, int flags, char *name) { res->start = start; res->end = end; res->flags = flags; res->name = name; res->parent = NULL; res->sibling = NULL; res->child = NULL; } void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max) { unsigned long start = pci_resource_start(dev, bar); unsigned long len = pci_resource_len(dev, bar); unsigned long flags = pci_resource_flags(dev, bar); if (!len) return NULL; if (max && len > max) len = max; if (flags & IORESOURCE_IO) return ioport_map(start, len); if (flags & IORESOURCE_MEM) /* Not checking IORESOURCE_CACHEABLE because PPC does * not currently distinguish between ioremap and * ioremap_nocache. */ return ioremap(start, len); /* What? */ return NULL; } void pci_iounmap(struct pci_dev *dev, void __iomem *addr) { /* Nothing to do */ } EXPORT_SYMBOL(pci_iomap); EXPORT_SYMBOL(pci_iounmap); unsigned long pci_address_to_pio(phys_addr_t address) { struct pci_controller* hose = hose_head; for (; hose; hose = hose->next) { unsigned int size = hose->io_resource.end - hose->io_resource.start + 1; if (address >= hose->io_base_phys && address < (hose->io_base_phys + size)) { unsigned long base = (unsigned long)hose->io_base_virt - _IO_BASE; return base + (address - hose->io_base_phys); } } return (unsigned int)-1; } EXPORT_SYMBOL(pci_address_to_pio); /* * Null PCI config access functions, for the case when we can't * find a hose. */ #define NULL_PCI_OP(rw, size, type) \ static int \ null_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \ { \ return PCIBIOS_DEVICE_NOT_FOUND; \ } static int null_read_config(struct pci_bus *bus, unsigned int devfn, int offset, int len, u32 *val) { return PCIBIOS_DEVICE_NOT_FOUND; } static int null_write_config(struct pci_bus *bus, unsigned int devfn, int offset, int len, u32 val) { return PCIBIOS_DEVICE_NOT_FOUND; } static struct pci_ops null_pci_ops = { null_read_config, null_write_config }; /* * These functions are used early on before PCI scanning is done * and all of the pci_dev and pci_bus structures have been created. */ static struct pci_bus * fake_pci_bus(struct pci_controller *hose, int busnr) { static struct pci_bus bus; if (hose == 0) { hose = pci_bus_to_hose(busnr); if (hose == 0) printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr); } bus.number = busnr; bus.sysdata = hose; bus.ops = hose? hose->ops: &null_pci_ops; return &bus; } #define EARLY_PCI_OP(rw, size, type) \ int early_##rw##_config_##size(struct pci_controller *hose, int bus, \ int devfn, int offset, type value) \ { \ return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus), \ devfn, offset, value); \ } EARLY_PCI_OP(read, byte, u8 *) EARLY_PCI_OP(read, word, u16 *) EARLY_PCI_OP(read, dword, u32 *) EARLY_PCI_OP(write, byte, u8) EARLY_PCI_OP(write, word, u16) EARLY_PCI_OP(write, dword, u32)