| /* |
| * probe.c - PCI detection and setup code |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/cpumask.h> |
| #include <linux/pci-aspm.h> |
| #include "pci.h" |
| |
| #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ |
| #define CARDBUS_RESERVE_BUSNR 3 |
| #define PCI_CFG_SPACE_SIZE 256 |
| #define PCI_CFG_SPACE_EXP_SIZE 4096 |
| |
| /* Ugh. Need to stop exporting this to modules. */ |
| LIST_HEAD(pci_root_buses); |
| EXPORT_SYMBOL(pci_root_buses); |
| |
| |
| static int find_anything(struct device *dev, void *data) |
| { |
| return 1; |
| } |
| |
| /* |
| * Some device drivers need know if pci is initiated. |
| * Basically, we think pci is not initiated when there |
| * is no device to be found on the pci_bus_type. |
| */ |
| int no_pci_devices(void) |
| { |
| struct device *dev; |
| int no_devices; |
| |
| dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
| no_devices = (dev == NULL); |
| put_device(dev); |
| return no_devices; |
| } |
| EXPORT_SYMBOL(no_pci_devices); |
| |
| #ifdef HAVE_PCI_LEGACY |
| /** |
| * pci_create_legacy_files - create legacy I/O port and memory files |
| * @b: bus to create files under |
| * |
| * Some platforms allow access to legacy I/O port and ISA memory space on |
| * a per-bus basis. This routine creates the files and ties them into |
| * their associated read, write and mmap files from pci-sysfs.c |
| */ |
| static void pci_create_legacy_files(struct pci_bus *b) |
| { |
| b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2, |
| GFP_ATOMIC); |
| if (b->legacy_io) { |
| b->legacy_io->attr.name = "legacy_io"; |
| b->legacy_io->size = 0xffff; |
| b->legacy_io->attr.mode = S_IRUSR | S_IWUSR; |
| b->legacy_io->read = pci_read_legacy_io; |
| b->legacy_io->write = pci_write_legacy_io; |
| device_create_bin_file(&b->dev, b->legacy_io); |
| |
| /* Allocated above after the legacy_io struct */ |
| b->legacy_mem = b->legacy_io + 1; |
| b->legacy_mem->attr.name = "legacy_mem"; |
| b->legacy_mem->size = 1024*1024; |
| b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR; |
| b->legacy_mem->mmap = pci_mmap_legacy_mem; |
| device_create_bin_file(&b->dev, b->legacy_mem); |
| } |
| } |
| |
| void pci_remove_legacy_files(struct pci_bus *b) |
| { |
| if (b->legacy_io) { |
| device_remove_bin_file(&b->dev, b->legacy_io); |
| device_remove_bin_file(&b->dev, b->legacy_mem); |
| kfree(b->legacy_io); /* both are allocated here */ |
| } |
| } |
| #else /* !HAVE_PCI_LEGACY */ |
| static inline void pci_create_legacy_files(struct pci_bus *bus) { return; } |
| void pci_remove_legacy_files(struct pci_bus *bus) { return; } |
| #endif /* HAVE_PCI_LEGACY */ |
| |
| /* |
| * PCI Bus Class Devices |
| */ |
| static ssize_t pci_bus_show_cpuaffinity(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| cpumask_t cpumask; |
| |
| cpumask = pcibus_to_cpumask(to_pci_bus(dev)); |
| ret = cpumask_scnprintf(buf, PAGE_SIZE, cpumask); |
| if (ret < PAGE_SIZE) |
| buf[ret++] = '\n'; |
| return ret; |
| } |
| DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpuaffinity, NULL); |
| |
| /* |
| * PCI Bus Class |
| */ |
| static void release_pcibus_dev(struct device *dev) |
| { |
| struct pci_bus *pci_bus = to_pci_bus(dev); |
| |
| if (pci_bus->bridge) |
| put_device(pci_bus->bridge); |
| kfree(pci_bus); |
| } |
| |
| static struct class pcibus_class = { |
| .name = "pci_bus", |
| .dev_release = &release_pcibus_dev, |
| }; |
| |
| static int __init pcibus_class_init(void) |
| { |
| return class_register(&pcibus_class); |
| } |
| postcore_initcall(pcibus_class_init); |
| |
| /* |
| * Translate the low bits of the PCI base |
| * to the resource type |
| */ |
| static inline unsigned int pci_calc_resource_flags(unsigned int flags) |
| { |
| if (flags & PCI_BASE_ADDRESS_SPACE_IO) |
| return IORESOURCE_IO; |
| |
| if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) |
| return IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| |
| return IORESOURCE_MEM; |
| } |
| |
| /* |
| * Find the extent of a PCI decode.. |
| */ |
| static u32 pci_size(u32 base, u32 maxbase, u32 mask) |
| { |
| u32 size = mask & maxbase; /* Find the significant bits */ |
| if (!size) |
| return 0; |
| |
| /* Get the lowest of them to find the decode size, and |
| from that the extent. */ |
| size = (size & ~(size-1)) - 1; |
| |
| /* base == maxbase can be valid only if the BAR has |
| already been programmed with all 1s. */ |
| if (base == maxbase && ((base | size) & mask) != mask) |
| return 0; |
| |
| return size; |
| } |
| |
| static u64 pci_size64(u64 base, u64 maxbase, u64 mask) |
| { |
| u64 size = mask & maxbase; /* Find the significant bits */ |
| if (!size) |
| return 0; |
| |
| /* Get the lowest of them to find the decode size, and |
| from that the extent. */ |
| size = (size & ~(size-1)) - 1; |
| |
| /* base == maxbase can be valid only if the BAR has |
| already been programmed with all 1s. */ |
| if (base == maxbase && ((base | size) & mask) != mask) |
| return 0; |
| |
| return size; |
| } |
| |
| static inline int is_64bit_memory(u32 mask) |
| { |
| if ((mask & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == |
| (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) |
| return 1; |
| return 0; |
| } |
| |
| static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
| { |
| unsigned int pos, reg, next; |
| u32 l, sz; |
| struct resource *res; |
| |
| for(pos=0; pos<howmany; pos = next) { |
| u64 l64; |
| u64 sz64; |
| u32 raw_sz; |
| |
| next = pos+1; |
| res = &dev->resource[pos]; |
| res->name = pci_name(dev); |
| reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
| pci_read_config_dword(dev, reg, &l); |
| pci_write_config_dword(dev, reg, ~0); |
| pci_read_config_dword(dev, reg, &sz); |
| pci_write_config_dword(dev, reg, l); |
| if (!sz || sz == 0xffffffff) |
| continue; |
| if (l == 0xffffffff) |
| l = 0; |
| raw_sz = sz; |
| if ((l & PCI_BASE_ADDRESS_SPACE) == |
| PCI_BASE_ADDRESS_SPACE_MEMORY) { |
| sz = pci_size(l, sz, (u32)PCI_BASE_ADDRESS_MEM_MASK); |
| /* |
| * For 64bit prefetchable memory sz could be 0, if the |
| * real size is bigger than 4G, so we need to check |
| * szhi for that. |
| */ |
| if (!is_64bit_memory(l) && !sz) |
| continue; |
| res->start = l & PCI_BASE_ADDRESS_MEM_MASK; |
| res->flags |= l & ~PCI_BASE_ADDRESS_MEM_MASK; |
| } else { |
| sz = pci_size(l, sz, PCI_BASE_ADDRESS_IO_MASK & 0xffff); |
| if (!sz) |
| continue; |
| res->start = l & PCI_BASE_ADDRESS_IO_MASK; |
| res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK; |
| } |
| res->end = res->start + (unsigned long) sz; |
| res->flags |= pci_calc_resource_flags(l); |
| if (is_64bit_memory(l)) { |
| u32 szhi, lhi; |
| |
| pci_read_config_dword(dev, reg+4, &lhi); |
| pci_write_config_dword(dev, reg+4, ~0); |
| pci_read_config_dword(dev, reg+4, &szhi); |
| pci_write_config_dword(dev, reg+4, lhi); |
| sz64 = ((u64)szhi << 32) | raw_sz; |
| l64 = ((u64)lhi << 32) | l; |
| sz64 = pci_size64(l64, sz64, PCI_BASE_ADDRESS_MEM_MASK); |
| next++; |
| #if BITS_PER_LONG == 64 |
| if (!sz64) { |
| res->start = 0; |
| res->end = 0; |
| res->flags = 0; |
| continue; |
| } |
| res->start = l64 & PCI_BASE_ADDRESS_MEM_MASK; |
| res->end = res->start + sz64; |
| #else |
| if (sz64 > 0x100000000ULL) { |
| printk(KERN_ERR "PCI: Unable to handle 64-bit " |
| "BAR for device %s\n", pci_name(dev)); |
| res->start = 0; |
| res->flags = 0; |
| } else if (lhi) { |
| /* 64-bit wide address, treat as disabled */ |
| pci_write_config_dword(dev, reg, |
| l & ~(u32)PCI_BASE_ADDRESS_MEM_MASK); |
| pci_write_config_dword(dev, reg+4, 0); |
| res->start = 0; |
| res->end = sz; |
| } |
| #endif |
| } |
| } |
| if (rom) { |
| dev->rom_base_reg = rom; |
| res = &dev->resource[PCI_ROM_RESOURCE]; |
| res->name = pci_name(dev); |
| pci_read_config_dword(dev, rom, &l); |
| pci_write_config_dword(dev, rom, ~PCI_ROM_ADDRESS_ENABLE); |
| pci_read_config_dword(dev, rom, &sz); |
| pci_write_config_dword(dev, rom, l); |
| if (l == 0xffffffff) |
| l = 0; |
| if (sz && sz != 0xffffffff) { |
| sz = pci_size(l, sz, (u32)PCI_ROM_ADDRESS_MASK); |
| if (sz) { |
| res->flags = (l & IORESOURCE_ROM_ENABLE) | |
| IORESOURCE_MEM | IORESOURCE_PREFETCH | |
| IORESOURCE_READONLY | IORESOURCE_CACHEABLE; |
| res->start = l & PCI_ROM_ADDRESS_MASK; |
| res->end = res->start + (unsigned long) sz; |
| } |
| } |
| } |
| } |
| |
| void __devinit pci_read_bridge_bases(struct pci_bus *child) |
| { |
| struct pci_dev *dev = child->self; |
| u8 io_base_lo, io_limit_lo; |
| u16 mem_base_lo, mem_limit_lo; |
| unsigned long base, limit; |
| struct resource *res; |
| int i; |
| |
| if (!dev) /* It's a host bus, nothing to read */ |
| return; |
| |
| if (dev->transparent) { |
| printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev)); |
| for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++) |
| child->resource[i] = child->parent->resource[i - 3]; |
| } |
| |
| for(i=0; i<3; i++) |
| child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; |
| |
| res = child->resource[0]; |
| pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); |
| pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); |
| base = (io_base_lo & PCI_IO_RANGE_MASK) << 8; |
| limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8; |
| |
| if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { |
| u16 io_base_hi, io_limit_hi; |
| pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
| pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); |
| base |= (io_base_hi << 16); |
| limit |= (io_limit_hi << 16); |
| } |
| |
| if (base <= limit) { |
| res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
| if (!res->start) |
| res->start = base; |
| if (!res->end) |
| res->end = limit + 0xfff; |
| } |
| |
| res = child->resource[1]; |
| pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); |
| pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); |
| base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
| limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; |
| if (base <= limit) { |
| res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
| res->start = base; |
| res->end = limit + 0xfffff; |
| } |
| |
| res = child->resource[2]; |
| pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); |
| pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); |
| base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
| limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; |
| |
| if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { |
| u32 mem_base_hi, mem_limit_hi; |
| pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
| pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); |
| |
| /* |
| * Some bridges set the base > limit by default, and some |
| * (broken) BIOSes do not initialize them. If we find |
| * this, just assume they are not being used. |
| */ |
| if (mem_base_hi <= mem_limit_hi) { |
| #if BITS_PER_LONG == 64 |
| base |= ((long) mem_base_hi) << 32; |
| limit |= ((long) mem_limit_hi) << 32; |
| #else |
| if (mem_base_hi || mem_limit_hi) { |
| printk(KERN_ERR "PCI: Unable to handle 64-bit address space for bridge %s\n", pci_name(dev)); |
| return; |
| } |
| #endif |
| } |
| } |
| if (base <= limit) { |
| res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| res->start = base; |
| res->end = limit + 0xfffff; |
| } |
| } |
| |
| static struct pci_bus * pci_alloc_bus(void) |
| { |
| struct pci_bus *b; |
| |
| b = kzalloc(sizeof(*b), GFP_KERNEL); |
| if (b) { |
| INIT_LIST_HEAD(&b->node); |
| INIT_LIST_HEAD(&b->children); |
| INIT_LIST_HEAD(&b->devices); |
| } |
| return b; |
| } |
| |
| static struct pci_bus * __devinit |
| pci_alloc_child_bus(struct pci_bus *parent, struct pci_dev *bridge, int busnr) |
| { |
| struct pci_bus *child; |
| int i; |
| |
| /* |
| * Allocate a new bus, and inherit stuff from the parent.. |
| */ |
| child = pci_alloc_bus(); |
| if (!child) |
| return NULL; |
| |
| child->self = bridge; |
| child->parent = parent; |
| child->ops = parent->ops; |
| child->sysdata = parent->sysdata; |
| child->bus_flags = parent->bus_flags; |
| child->bridge = get_device(&bridge->dev); |
| |
| /* initialize some portions of the bus device, but don't register it |
| * now as the parent is not properly set up yet. This device will get |
| * registered later in pci_bus_add_devices() |
| */ |
| child->dev.class = &pcibus_class; |
| sprintf(child->dev.bus_id, "%04x:%02x", pci_domain_nr(child), busnr); |
| |
| /* |
| * Set up the primary, secondary and subordinate |
| * bus numbers. |
| */ |
| child->number = child->secondary = busnr; |
| child->primary = parent->secondary; |
| child->subordinate = 0xff; |
| |
| /* Set up default resource pointers and names.. */ |
| for (i = 0; i < 4; i++) { |
| child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
| child->resource[i]->name = child->name; |
| } |
| bridge->subordinate = child; |
| |
| return child; |
| } |
| |
| struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
| { |
| struct pci_bus *child; |
| |
| child = pci_alloc_child_bus(parent, dev, busnr); |
| if (child) { |
| down_write(&pci_bus_sem); |
| list_add_tail(&child->node, &parent->children); |
| up_write(&pci_bus_sem); |
| } |
| return child; |
| } |
| |
| static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
| { |
| struct pci_bus *parent = child->parent; |
| |
| /* Attempts to fix that up are really dangerous unless |
| we're going to re-assign all bus numbers. */ |
| if (!pcibios_assign_all_busses()) |
| return; |
| |
| while (parent->parent && parent->subordinate < max) { |
| parent->subordinate = max; |
| pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); |
| parent = parent->parent; |
| } |
| } |
| |
| /* |
| * If it's a bridge, configure it and scan the bus behind it. |
| * For CardBus bridges, we don't scan behind as the devices will |
| * be handled by the bridge driver itself. |
| * |
| * We need to process bridges in two passes -- first we scan those |
| * already configured by the BIOS and after we are done with all of |
| * them, we proceed to assigning numbers to the remaining buses in |
| * order to avoid overlaps between old and new bus numbers. |
| */ |
| int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
| { |
| struct pci_bus *child; |
| int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); |
| u32 buses, i, j = 0; |
| u16 bctl; |
| |
| pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); |
| |
| pr_debug("PCI: Scanning behind PCI bridge %s, config %06x, pass %d\n", |
| pci_name(dev), buses & 0xffffff, pass); |
| |
| /* Disable MasterAbortMode during probing to avoid reporting |
| of bus errors (in some architectures) */ |
| pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
| pci_write_config_word(dev, PCI_BRIDGE_CONTROL, |
| bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); |
| |
| if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) { |
| unsigned int cmax, busnr; |
| /* |
| * Bus already configured by firmware, process it in the first |
| * pass and just note the configuration. |
| */ |
| if (pass) |
| goto out; |
| busnr = (buses >> 8) & 0xFF; |
| |
| /* |
| * If we already got to this bus through a different bridge, |
| * ignore it. This can happen with the i450NX chipset. |
| */ |
| if (pci_find_bus(pci_domain_nr(bus), busnr)) { |
| printk(KERN_INFO "PCI: Bus %04x:%02x already known\n", |
| pci_domain_nr(bus), busnr); |
| goto out; |
| } |
| |
| child = pci_add_new_bus(bus, dev, busnr); |
| if (!child) |
| goto out; |
| child->primary = buses & 0xFF; |
| child->subordinate = (buses >> 16) & 0xFF; |
| child->bridge_ctl = bctl; |
| |
| cmax = pci_scan_child_bus(child); |
| if (cmax > max) |
| max = cmax; |
| if (child->subordinate > max) |
| max = child->subordinate; |
| } else { |
| /* |
| * We need to assign a number to this bus which we always |
| * do in the second pass. |
| */ |
| if (!pass) { |
| if (pcibios_assign_all_busses()) |
| /* Temporarily disable forwarding of the |
| configuration cycles on all bridges in |
| this bus segment to avoid possible |
| conflicts in the second pass between two |
| bridges programmed with overlapping |
| bus ranges. */ |
| pci_write_config_dword(dev, PCI_PRIMARY_BUS, |
| buses & ~0xffffff); |
| goto out; |
| } |
| |
| /* Clear errors */ |
| pci_write_config_word(dev, PCI_STATUS, 0xffff); |
| |
| /* Prevent assigning a bus number that already exists. |
| * This can happen when a bridge is hot-plugged */ |
| if (pci_find_bus(pci_domain_nr(bus), max+1)) |
| goto out; |
| child = pci_add_new_bus(bus, dev, ++max); |
| buses = (buses & 0xff000000) |
| | ((unsigned int)(child->primary) << 0) |
| | ((unsigned int)(child->secondary) << 8) |
| | ((unsigned int)(child->subordinate) << 16); |
| |
| /* |
| * yenta.c forces a secondary latency timer of 176. |
| * Copy that behaviour here. |
| */ |
| if (is_cardbus) { |
| buses &= ~0xff000000; |
| buses |= CARDBUS_LATENCY_TIMER << 24; |
| } |
| |
| /* |
| * We need to blast all three values with a single write. |
| */ |
| pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); |
| |
| if (!is_cardbus) { |
| child->bridge_ctl = bctl; |
| /* |
| * Adjust subordinate busnr in parent buses. |
| * We do this before scanning for children because |
| * some devices may not be detected if the bios |
| * was lazy. |
| */ |
| pci_fixup_parent_subordinate_busnr(child, max); |
| /* Now we can scan all subordinate buses... */ |
| max = pci_scan_child_bus(child); |
| /* |
| * now fix it up again since we have found |
| * the real value of max. |
| */ |
| pci_fixup_parent_subordinate_busnr(child, max); |
| } else { |
| /* |
| * For CardBus bridges, we leave 4 bus numbers |
| * as cards with a PCI-to-PCI bridge can be |
| * inserted later. |
| */ |
| for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
| struct pci_bus *parent = bus; |
| if (pci_find_bus(pci_domain_nr(bus), |
| max+i+1)) |
| break; |
| while (parent->parent) { |
| if ((!pcibios_assign_all_busses()) && |
| (parent->subordinate > max) && |
| (parent->subordinate <= max+i)) { |
| j = 1; |
| } |
| parent = parent->parent; |
| } |
| if (j) { |
| /* |
| * Often, there are two cardbus bridges |
| * -- try to leave one valid bus number |
| * for each one. |
| */ |
| i /= 2; |
| break; |
| } |
| } |
| max += i; |
| pci_fixup_parent_subordinate_busnr(child, max); |
| } |
| /* |
| * Set the subordinate bus number to its real value. |
| */ |
| child->subordinate = max; |
| pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
| } |
| |
| sprintf(child->name, |
| (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), |
| pci_domain_nr(bus), child->number); |
| |
| /* Has only triggered on CardBus, fixup is in yenta_socket */ |
| while (bus->parent) { |
| if ((child->subordinate > bus->subordinate) || |
| (child->number > bus->subordinate) || |
| (child->number < bus->number) || |
| (child->subordinate < bus->number)) { |
| pr_debug("PCI: Bus #%02x (-#%02x) is %s " |
| "hidden behind%s bridge #%02x (-#%02x)\n", |
| child->number, child->subordinate, |
| (bus->number > child->subordinate && |
| bus->subordinate < child->number) ? |
| "wholly" : "partially", |
| bus->self->transparent ? " transparent" : "", |
| bus->number, bus->subordinate); |
| } |
| bus = bus->parent; |
| } |
| |
| out: |
| pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); |
| |
| return max; |
| } |
| |
| /* |
| * Read interrupt line and base address registers. |
| * The architecture-dependent code can tweak these, of course. |
| */ |
| static void pci_read_irq(struct pci_dev *dev) |
| { |
| unsigned char irq; |
| |
| pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); |
| dev->pin = irq; |
| if (irq) |
| pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); |
| dev->irq = irq; |
| } |
| |
| #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
| |
| /** |
| * pci_setup_device - fill in class and map information of a device |
| * @dev: the device structure to fill |
| * |
| * Initialize the device structure with information about the device's |
| * vendor,class,memory and IO-space addresses,IRQ lines etc. |
| * Called at initialisation of the PCI subsystem and by CardBus services. |
| * Returns 0 on success and -1 if unknown type of device (not normal, bridge |
| * or CardBus). |
| */ |
| static int pci_setup_device(struct pci_dev * dev) |
| { |
| u32 class; |
| |
| sprintf(pci_name(dev), "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
| dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); |
| |
| pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); |
| dev->revision = class & 0xff; |
| class >>= 8; /* upper 3 bytes */ |
| dev->class = class; |
| class >>= 8; |
| |
| pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev), |
| dev->vendor, dev->device, class, dev->hdr_type); |
| |
| /* "Unknown power state" */ |
| dev->current_state = PCI_UNKNOWN; |
| |
| /* Early fixups, before probing the BARs */ |
| pci_fixup_device(pci_fixup_early, dev); |
| class = dev->class >> 8; |
| |
| switch (dev->hdr_type) { /* header type */ |
| case PCI_HEADER_TYPE_NORMAL: /* standard header */ |
| if (class == PCI_CLASS_BRIDGE_PCI) |
| goto bad; |
| pci_read_irq(dev); |
| pci_read_bases(dev, 6, PCI_ROM_ADDRESS); |
| pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); |
| |
| /* |
| * Do the ugly legacy mode stuff here rather than broken chip |
| * quirk code. Legacy mode ATA controllers have fixed |
| * addresses. These are not always echoed in BAR0-3, and |
| * BAR0-3 in a few cases contain junk! |
| */ |
| if (class == PCI_CLASS_STORAGE_IDE) { |
| u8 progif; |
| pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); |
| if ((progif & 1) == 0) { |
| dev->resource[0].start = 0x1F0; |
| dev->resource[0].end = 0x1F7; |
| dev->resource[0].flags = LEGACY_IO_RESOURCE; |
| dev->resource[1].start = 0x3F6; |
| dev->resource[1].end = 0x3F6; |
| dev->resource[1].flags = LEGACY_IO_RESOURCE; |
| } |
| if ((progif & 4) == 0) { |
| dev->resource[2].start = 0x170; |
| dev->resource[2].end = 0x177; |
| dev->resource[2].flags = LEGACY_IO_RESOURCE; |
| dev->resource[3].start = 0x376; |
| dev->resource[3].end = 0x376; |
| dev->resource[3].flags = LEGACY_IO_RESOURCE; |
| } |
| } |
| break; |
| |
| case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ |
| if (class != PCI_CLASS_BRIDGE_PCI) |
| goto bad; |
| /* The PCI-to-PCI bridge spec requires that subtractive |
| decoding (i.e. transparent) bridge must have programming |
| interface code of 0x01. */ |
| pci_read_irq(dev); |
| dev->transparent = ((dev->class & 0xff) == 1); |
| pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); |
| break; |
| |
| case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ |
| if (class != PCI_CLASS_BRIDGE_CARDBUS) |
| goto bad; |
| pci_read_irq(dev); |
| pci_read_bases(dev, 1, 0); |
| pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); |
| break; |
| |
| default: /* unknown header */ |
| printk(KERN_ERR "PCI: device %s has unknown header type %02x, ignoring.\n", |
| pci_name(dev), dev->hdr_type); |
| return -1; |
| |
| bad: |
| printk(KERN_ERR "PCI: %s: class %x doesn't match header type %02x. Ignoring class.\n", |
| pci_name(dev), class, dev->hdr_type); |
| dev->class = PCI_CLASS_NOT_DEFINED; |
| } |
| |
| /* We found a fine healthy device, go go go... */ |
| return 0; |
| } |
| |
| /** |
| * pci_release_dev - free a pci device structure when all users of it are finished. |
| * @dev: device that's been disconnected |
| * |
| * Will be called only by the device core when all users of this pci device are |
| * done. |
| */ |
| static void pci_release_dev(struct device *dev) |
| { |
| struct pci_dev *pci_dev; |
| |
| pci_dev = to_pci_dev(dev); |
| pci_vpd_release(pci_dev); |
| kfree(pci_dev); |
| } |
| |
| static void set_pcie_port_type(struct pci_dev *pdev) |
| { |
| int pos; |
| u16 reg16; |
| |
| pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); |
| if (!pos) |
| return; |
| pdev->is_pcie = 1; |
| pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
| pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4; |
| } |
| |
| /** |
| * pci_cfg_space_size - get the configuration space size of the PCI device. |
| * @dev: PCI device |
| * |
| * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices |
| * have 4096 bytes. Even if the device is capable, that doesn't mean we can |
| * access it. Maybe we don't have a way to generate extended config space |
| * accesses, or the device is behind a reverse Express bridge. So we try |
| * reading the dword at 0x100 which must either be 0 or a valid extended |
| * capability header. |
| */ |
| int pci_cfg_space_size(struct pci_dev *dev) |
| { |
| int pos; |
| u32 status; |
| |
| pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
| if (!pos) { |
| pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| if (!pos) |
| goto fail; |
| |
| pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); |
| if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) |
| goto fail; |
| } |
| |
| if (pci_read_config_dword(dev, 256, &status) != PCIBIOS_SUCCESSFUL) |
| goto fail; |
| if (status == 0xffffffff) |
| goto fail; |
| |
| return PCI_CFG_SPACE_EXP_SIZE; |
| |
| fail: |
| return PCI_CFG_SPACE_SIZE; |
| } |
| |
| static void pci_release_bus_bridge_dev(struct device *dev) |
| { |
| kfree(dev); |
| } |
| |
| struct pci_dev *alloc_pci_dev(void) |
| { |
| struct pci_dev *dev; |
| |
| dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); |
| if (!dev) |
| return NULL; |
| |
| INIT_LIST_HEAD(&dev->bus_list); |
| |
| pci_msi_init_pci_dev(dev); |
| |
| return dev; |
| } |
| EXPORT_SYMBOL(alloc_pci_dev); |
| |
| /* |
| * Read the config data for a PCI device, sanity-check it |
| * and fill in the dev structure... |
| */ |
| static struct pci_dev * __devinit |
| pci_scan_device(struct pci_bus *bus, int devfn) |
| { |
| struct pci_dev *dev; |
| u32 l; |
| u8 hdr_type; |
| int delay = 1; |
| |
| if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) |
| return NULL; |
| |
| /* some broken boards return 0 or ~0 if a slot is empty: */ |
| if (l == 0xffffffff || l == 0x00000000 || |
| l == 0x0000ffff || l == 0xffff0000) |
| return NULL; |
| |
| /* Configuration request Retry Status */ |
| while (l == 0xffff0001) { |
| msleep(delay); |
| delay *= 2; |
| if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l)) |
| return NULL; |
| /* Card hasn't responded in 60 seconds? Must be stuck. */ |
| if (delay > 60 * 1000) { |
| printk(KERN_WARNING "Device %04x:%02x:%02x.%d not " |
| "responding\n", pci_domain_nr(bus), |
| bus->number, PCI_SLOT(devfn), |
| PCI_FUNC(devfn)); |
| return NULL; |
| } |
| } |
| |
| if (pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type)) |
| return NULL; |
| |
| dev = alloc_pci_dev(); |
| if (!dev) |
| return NULL; |
| |
| dev->bus = bus; |
| dev->sysdata = bus->sysdata; |
| dev->dev.parent = bus->bridge; |
| dev->dev.bus = &pci_bus_type; |
| dev->devfn = devfn; |
| dev->hdr_type = hdr_type & 0x7f; |
| dev->multifunction = !!(hdr_type & 0x80); |
| dev->vendor = l & 0xffff; |
| dev->device = (l >> 16) & 0xffff; |
| dev->cfg_size = pci_cfg_space_size(dev); |
| dev->error_state = pci_channel_io_normal; |
| set_pcie_port_type(dev); |
| |
| /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) |
| set this higher, assuming the system even supports it. */ |
| dev->dma_mask = 0xffffffff; |
| if (pci_setup_device(dev) < 0) { |
| kfree(dev); |
| return NULL; |
| } |
| |
| pci_vpd_pci22_init(dev); |
| |
| return dev; |
| } |
| |
| void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
| { |
| device_initialize(&dev->dev); |
| dev->dev.release = pci_release_dev; |
| pci_dev_get(dev); |
| |
| set_dev_node(&dev->dev, pcibus_to_node(bus)); |
| dev->dev.dma_mask = &dev->dma_mask; |
| dev->dev.dma_parms = &dev->dma_parms; |
| dev->dev.coherent_dma_mask = 0xffffffffull; |
| |
| pci_set_dma_max_seg_size(dev, 65536); |
| pci_set_dma_seg_boundary(dev, 0xffffffff); |
| |
| /* Fix up broken headers */ |
| pci_fixup_device(pci_fixup_header, dev); |
| |
| /* |
| * Add the device to our list of discovered devices |
| * and the bus list for fixup functions, etc. |
| */ |
| down_write(&pci_bus_sem); |
| list_add_tail(&dev->bus_list, &bus->devices); |
| up_write(&pci_bus_sem); |
| } |
| |
| struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) |
| { |
| struct pci_dev *dev; |
| |
| dev = pci_scan_device(bus, devfn); |
| if (!dev) |
| return NULL; |
| |
| pci_device_add(dev, bus); |
| |
| return dev; |
| } |
| EXPORT_SYMBOL(pci_scan_single_device); |
| |
| /** |
| * pci_scan_slot - scan a PCI slot on a bus for devices. |
| * @bus: PCI bus to scan |
| * @devfn: slot number to scan (must have zero function.) |
| * |
| * Scan a PCI slot on the specified PCI bus for devices, adding |
| * discovered devices to the @bus->devices list. New devices |
| * will not have is_added set. |
| */ |
| int pci_scan_slot(struct pci_bus *bus, int devfn) |
| { |
| int func, nr = 0; |
| int scan_all_fns; |
| |
| scan_all_fns = pcibios_scan_all_fns(bus, devfn); |
| |
| for (func = 0; func < 8; func++, devfn++) { |
| struct pci_dev *dev; |
| |
| dev = pci_scan_single_device(bus, devfn); |
| if (dev) { |
| nr++; |
| |
| /* |
| * If this is a single function device, |
| * don't scan past the first function. |
| */ |
| if (!dev->multifunction) { |
| if (func > 0) { |
| dev->multifunction = 1; |
| } else { |
| break; |
| } |
| } |
| } else { |
| if (func == 0 && !scan_all_fns) |
| break; |
| } |
| } |
| |
| if (bus->self) |
| pcie_aspm_init_link_state(bus->self); |
| |
| return nr; |
| } |
| |
| unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) |
| { |
| unsigned int devfn, pass, max = bus->secondary; |
| struct pci_dev *dev; |
| |
| pr_debug("PCI: Scanning bus %04x:%02x\n", pci_domain_nr(bus), bus->number); |
| |
| /* Go find them, Rover! */ |
| for (devfn = 0; devfn < 0x100; devfn += 8) |
| pci_scan_slot(bus, devfn); |
| |
| /* |
| * After performing arch-dependent fixup of the bus, look behind |
| * all PCI-to-PCI bridges on this bus. |
| */ |
| pr_debug("PCI: Fixups for bus %04x:%02x\n", pci_domain_nr(bus), bus->number); |
| pcibios_fixup_bus(bus); |
| for (pass=0; pass < 2; pass++) |
| list_for_each_entry(dev, &bus->devices, bus_list) { |
| if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| max = pci_scan_bridge(bus, dev, max, pass); |
| } |
| |
| /* |
| * We've scanned the bus and so we know all about what's on |
| * the other side of any bridges that may be on this bus plus |
| * any devices. |
| * |
| * Return how far we've got finding sub-buses. |
| */ |
| pr_debug("PCI: Bus scan for %04x:%02x returning with max=%02x\n", |
| pci_domain_nr(bus), bus->number, max); |
| return max; |
| } |
| |
| struct pci_bus * pci_create_bus(struct device *parent, |
| int bus, struct pci_ops *ops, void *sysdata) |
| { |
| int error; |
| struct pci_bus *b; |
| struct device *dev; |
| |
| b = pci_alloc_bus(); |
| if (!b) |
| return NULL; |
| |
| dev = kmalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev){ |
| kfree(b); |
| return NULL; |
| } |
| |
| b->sysdata = sysdata; |
| b->ops = ops; |
| |
| if (pci_find_bus(pci_domain_nr(b), bus)) { |
| /* If we already got to this bus through a different bridge, ignore it */ |
| pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus); |
| goto err_out; |
| } |
| |
| down_write(&pci_bus_sem); |
| list_add_tail(&b->node, &pci_root_buses); |
| up_write(&pci_bus_sem); |
| |
| memset(dev, 0, sizeof(*dev)); |
| dev->parent = parent; |
| dev->release = pci_release_bus_bridge_dev; |
| sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus); |
| error = device_register(dev); |
| if (error) |
| goto dev_reg_err; |
| b->bridge = get_device(dev); |
| |
| b->dev.class = &pcibus_class; |
| b->dev.parent = b->bridge; |
| sprintf(b->dev.bus_id, "%04x:%02x", pci_domain_nr(b), bus); |
| error = device_register(&b->dev); |
| if (error) |
| goto class_dev_reg_err; |
| error = device_create_file(&b->dev, &dev_attr_cpuaffinity); |
| if (error) |
| goto dev_create_file_err; |
| |
| /* Create legacy_io and legacy_mem files for this bus */ |
| pci_create_legacy_files(b); |
| |
| b->number = b->secondary = bus; |
| b->resource[0] = &ioport_resource; |
| b->resource[1] = &iomem_resource; |
| |
| return b; |
| |
| dev_create_file_err: |
| device_unregister(&b->dev); |
| class_dev_reg_err: |
| device_unregister(dev); |
| dev_reg_err: |
| down_write(&pci_bus_sem); |
| list_del(&b->node); |
| up_write(&pci_bus_sem); |
| err_out: |
| kfree(dev); |
| kfree(b); |
| return NULL; |
| } |
| |
| struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, |
| int bus, struct pci_ops *ops, void *sysdata) |
| { |
| struct pci_bus *b; |
| |
| b = pci_create_bus(parent, bus, ops, sysdata); |
| if (b) |
| b->subordinate = pci_scan_child_bus(b); |
| return b; |
| } |
| EXPORT_SYMBOL(pci_scan_bus_parented); |
| |
| #ifdef CONFIG_HOTPLUG |
| EXPORT_SYMBOL(pci_add_new_bus); |
| EXPORT_SYMBOL(pci_scan_slot); |
| EXPORT_SYMBOL(pci_scan_bridge); |
| EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
| #endif |
| |
| static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b) |
| { |
| if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
| else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; |
| |
| if (a->bus->number < b->bus->number) return -1; |
| else if (a->bus->number > b->bus->number) return 1; |
| |
| if (a->devfn < b->devfn) return -1; |
| else if (a->devfn > b->devfn) return 1; |
| |
| return 0; |
| } |
| |
| /* |
| * Yes, this forcably breaks the klist abstraction temporarily. It |
| * just wants to sort the klist, not change reference counts and |
| * take/drop locks rapidly in the process. It does all this while |
| * holding the lock for the list, so objects can't otherwise be |
| * added/removed while we're swizzling. |
| */ |
| static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list) |
| { |
| struct list_head *pos; |
| struct klist_node *n; |
| struct device *dev; |
| struct pci_dev *b; |
| |
| list_for_each(pos, list) { |
| n = container_of(pos, struct klist_node, n_node); |
| dev = container_of(n, struct device, knode_bus); |
| b = to_pci_dev(dev); |
| if (pci_sort_bf_cmp(a, b) <= 0) { |
| list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node); |
| return; |
| } |
| } |
| list_move_tail(&a->dev.knode_bus.n_node, list); |
| } |
| |
| void __init pci_sort_breadthfirst(void) |
| { |
| LIST_HEAD(sorted_devices); |
| struct list_head *pos, *tmp; |
| struct klist_node *n; |
| struct device *dev; |
| struct pci_dev *pdev; |
| struct klist *device_klist; |
| |
| device_klist = bus_get_device_klist(&pci_bus_type); |
| |
| spin_lock(&device_klist->k_lock); |
| list_for_each_safe(pos, tmp, &device_klist->k_list) { |
| n = container_of(pos, struct klist_node, n_node); |
| dev = container_of(n, struct device, knode_bus); |
| pdev = to_pci_dev(dev); |
| pci_insertion_sort_klist(pdev, &sorted_devices); |
| } |
| list_splice(&sorted_devices, &device_klist->k_list); |
| spin_unlock(&device_klist->k_lock); |
| } |