/* * Low-Level PCI Support for PC * * (c) 1999--2000 Martin Mares */ #include #include #include #include #include #include #include #include #include #include "pci-i386.h" unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2; int pcibios_last_bus = -1; struct pci_bus *pci_root_bus = NULL; struct pci_ops *pci_root_ops = NULL; int (*pci_config_read)(int seg, int bus, int dev, int fn, int reg, int len, u32 *value) = NULL; int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int len, u32 value) = NULL; /* * This interrupt-safe spinlock protects all accesses to PCI * configuration space. */ static spinlock_t pci_config_lock = SPIN_LOCK_UNLOCKED; /* * Functions for accessing PCI configuration space with type 1 accesses */ #ifdef CONFIG_PCI_DIRECT #define PCI_CONF1_ADDRESS(bus, dev, fn, reg) \ (0x80000000 | (bus << 16) | (dev << 11) | (fn << 8) | (reg & ~3)) static int pci_conf1_read (int seg, int bus, int dev, int fn, int reg, int len, u32 *value) { unsigned long flags; if (!value || (bus > 255) || (dev > 31) || (fn > 7) || (reg > 255)) return -EINVAL; spin_lock_irqsave(&pci_config_lock, flags); outl(PCI_CONF1_ADDRESS(bus, dev, fn, reg), 0xCF8); switch (len) { case 1: *value = inb(0xCFC + (reg & 3)); break; case 2: *value = inw(0xCFC + (reg & 2)); break; case 4: *value = inl(0xCFC); break; } spin_unlock_irqrestore(&pci_config_lock, flags); return 0; } static int pci_conf1_write (int seg, int bus, int dev, int fn, int reg, int len, u32 value) { unsigned long flags; if ((bus > 255) || (dev > 31) || (fn > 7) || (reg > 255)) return -EINVAL; spin_lock_irqsave(&pci_config_lock, flags); outl(PCI_CONF1_ADDRESS(bus, dev, fn, reg), 0xCF8); switch (len) { case 1: outb((u8)value, 0xCFC + (reg & 3)); break; case 2: outw((u16)value, 0xCFC + (reg & 2)); break; case 4: outl((u32)value, 0xCFC); break; } spin_unlock_irqrestore(&pci_config_lock, flags); return 0; } #undef PCI_CONF1_ADDRESS static int pci_conf1_read_config_byte(struct pci_dev *dev, int where, u8 *value) { int result; u32 data; if (!value) return -EINVAL; result = pci_conf1_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 1, &data); *value = (u8)data; return result; } static int pci_conf1_read_config_word(struct pci_dev *dev, int where, u16 *value) { int result; u32 data; if (!value) return -EINVAL; result = pci_conf1_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 2, &data); *value = (u16)data; return result; } static int pci_conf1_read_config_dword(struct pci_dev *dev, int where, u32 *value) { if (!value) return -EINVAL; return pci_conf1_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 4, value); } static int pci_conf1_write_config_byte(struct pci_dev *dev, int where, u8 value) { return pci_conf1_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 1, value); } static int pci_conf1_write_config_word(struct pci_dev *dev, int where, u16 value) { return pci_conf1_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 2, value); } static int pci_conf1_write_config_dword(struct pci_dev *dev, int where, u32 value) { return pci_conf1_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 4, value); } static struct pci_ops pci_direct_conf1 = { pci_conf1_read_config_byte, pci_conf1_read_config_word, pci_conf1_read_config_dword, pci_conf1_write_config_byte, pci_conf1_write_config_word, pci_conf1_write_config_dword }; /* * Functions for accessing PCI configuration space with type 2 accesses */ #define PCI_CONF2_ADDRESS(dev, reg) (u16)(0xC000 | (dev << 8) | reg) static int pci_conf2_read (int seg, int bus, int dev, int fn, int reg, int len, u32 *value) { unsigned long flags; if (!value || (bus > 255) || (dev > 31) || (fn > 7) || (reg > 255)) return -EINVAL; if (dev & 0x10) return PCIBIOS_DEVICE_NOT_FOUND; spin_lock_irqsave(&pci_config_lock, flags); outb((u8)(0xF0 | (fn << 1)), 0xCF8); outb((u8)bus, 0xCFA); switch (len) { case 1: *value = inb(PCI_CONF2_ADDRESS(dev, reg)); break; case 2: *value = inw(PCI_CONF2_ADDRESS(dev, reg)); break; case 4: *value = inl(PCI_CONF2_ADDRESS(dev, reg)); break; } outb (0, 0xCF8); spin_unlock_irqrestore(&pci_config_lock, flags); return 0; } static int pci_conf2_write (int seg, int bus, int dev, int fn, int reg, int len, u32 value) { unsigned long flags; if ((bus > 255) || (dev > 31) || (fn > 7) || (reg > 255)) return -EINVAL; if (dev & 0x10) return PCIBIOS_DEVICE_NOT_FOUND; spin_lock_irqsave(&pci_config_lock, flags); outb((u8)(0xF0 | (fn << 1)), 0xCF8); outb((u8)bus, 0xCFA); switch (len) { case 1: outb ((u8)value, PCI_CONF2_ADDRESS(dev, reg)); break; case 2: outw ((u16)value, PCI_CONF2_ADDRESS(dev, reg)); break; case 4: outl ((u32)value, PCI_CONF2_ADDRESS(dev, reg)); break; } outb (0, 0xCF8); spin_unlock_irqrestore(&pci_config_lock, flags); return 0; } #undef PCI_CONF2_ADDRESS static int pci_conf2_read_config_byte(struct pci_dev *dev, int where, u8 *value) { int result; u32 data; result = pci_conf2_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 1, &data); *value = (u8)data; return result; } static int pci_conf2_read_config_word(struct pci_dev *dev, int where, u16 *value) { int result; u32 data; result = pci_conf2_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 2, &data); *value = (u16)data; return result; } static int pci_conf2_read_config_dword(struct pci_dev *dev, int where, u32 *value) { return pci_conf2_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 4, value); } static int pci_conf2_write_config_byte(struct pci_dev *dev, int where, u8 value) { return pci_conf2_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 1, value); } static int pci_conf2_write_config_word(struct pci_dev *dev, int where, u16 value) { return pci_conf2_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 2, value); } static int pci_conf2_write_config_dword(struct pci_dev *dev, int where, u32 value) { return pci_conf2_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 4, value); } static struct pci_ops pci_direct_conf2 = { pci_conf2_read_config_byte, pci_conf2_read_config_word, pci_conf2_read_config_dword, pci_conf2_write_config_byte, pci_conf2_write_config_word, pci_conf2_write_config_dword }; /* * Before we decide to use direct hardware access mechanisms, we try to do some * trivial checks to ensure it at least _seems_ to be working -- we just test * whether bus 00 contains a host bridge (this is similar to checking * techniques used in XFree86, but ours should be more reliable since we * attempt to make use of direct access hints provided by the PCI BIOS). * * This should be close to trivial, but it isn't, because there are buggy * chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID. */ static int __devinit pci_sanity_check(struct pci_ops *o) { u16 x; struct pci_bus bus; /* Fake bus and device */ struct pci_dev dev; if (pci_probe & PCI_NO_CHECKS) return 1; bus.number = 0; dev.bus = &bus; for(dev.devfn=0; dev.devfn < 0x100; dev.devfn++) if ((!o->read_word(&dev, PCI_CLASS_DEVICE, &x) && (x == PCI_CLASS_BRIDGE_HOST || x == PCI_CLASS_DISPLAY_VGA)) || (!o->read_word(&dev, PCI_VENDOR_ID, &x) && (x == PCI_VENDOR_ID_INTEL || x == PCI_VENDOR_ID_COMPAQ))) return 1; DBG("PCI: Sanity check failed\n"); return 0; } static struct pci_ops * __devinit pci_check_direct(void) { unsigned int tmp; unsigned long flags; __save_flags(flags); __cli(); /* * Check if configuration type 1 works. */ if (pci_probe & PCI_PROBE_CONF1) { outb (0x01, 0xCFB); tmp = inl (0xCF8); outl (0x80000000, 0xCF8); if (inl (0xCF8) == 0x80000000 && pci_sanity_check(&pci_direct_conf1)) { outl (tmp, 0xCF8); __restore_flags(flags); printk("PCI: Using configuration type 1\n"); request_region(0xCF8, 8, "PCI conf1"); return &pci_direct_conf1; } outl (tmp, 0xCF8); } /* * Check if configuration type 2 works. */ if (pci_probe & PCI_PROBE_CONF2) { outb (0x00, 0xCFB); outb (0x00, 0xCF8); outb (0x00, 0xCFA); if (inb (0xCF8) == 0x00 && inb (0xCFA) == 0x00 && pci_sanity_check(&pci_direct_conf2)) { __restore_flags(flags); printk("PCI: Using configuration type 2\n"); request_region(0xCF8, 4, "PCI conf2"); return &pci_direct_conf2; } } __restore_flags(flags); return NULL; } #endif /* * BIOS32 and PCI BIOS handling. */ #ifdef CONFIG_PCI_BIOS #define PCIBIOS_PCI_FUNCTION_ID 0xb1XX #define PCIBIOS_PCI_BIOS_PRESENT 0xb101 #define PCIBIOS_FIND_PCI_DEVICE 0xb102 #define PCIBIOS_FIND_PCI_CLASS_CODE 0xb103 #define PCIBIOS_GENERATE_SPECIAL_CYCLE 0xb106 #define PCIBIOS_READ_CONFIG_BYTE 0xb108 #define PCIBIOS_READ_CONFIG_WORD 0xb109 #define PCIBIOS_READ_CONFIG_DWORD 0xb10a #define PCIBIOS_WRITE_CONFIG_BYTE 0xb10b #define PCIBIOS_WRITE_CONFIG_WORD 0xb10c #define PCIBIOS_WRITE_CONFIG_DWORD 0xb10d #define PCIBIOS_GET_ROUTING_OPTIONS 0xb10e #define PCIBIOS_SET_PCI_HW_INT 0xb10f /* BIOS32 signature: "_32_" */ #define BIOS32_SIGNATURE (('_' << 0) + ('3' << 8) + ('2' << 16) + ('_' << 24)) /* PCI signature: "PCI " */ #define PCI_SIGNATURE (('P' << 0) + ('C' << 8) + ('I' << 16) + (' ' << 24)) /* PCI service signature: "$PCI" */ #define PCI_SERVICE (('$' << 0) + ('P' << 8) + ('C' << 16) + ('I' << 24)) /* PCI BIOS hardware mechanism flags */ #define PCIBIOS_HW_TYPE1 0x01 #define PCIBIOS_HW_TYPE2 0x02 #define PCIBIOS_HW_TYPE1_SPEC 0x10 #define PCIBIOS_HW_TYPE2_SPEC 0x20 /* * This is the standard structure used to identify the entry point * to the BIOS32 Service Directory, as documented in * Standard BIOS 32-bit Service Directory Proposal * Revision 0.4 May 24, 1993 * Phoenix Technologies Ltd. * Norwood, MA * and the PCI BIOS specification. */ union bios32 { struct { unsigned long signature; /* _32_ */ unsigned long entry; /* 32 bit physical address */ unsigned char revision; /* Revision level, 0 */ unsigned char length; /* Length in paragraphs should be 01 */ unsigned char checksum; /* All bytes must add up to zero */ unsigned char reserved[5]; /* Must be zero */ } fields; char chars[16]; }; /* * Physical address of the service directory. I don't know if we're * allowed to have more than one of these or not, so just in case * we'll make pcibios_present() take a memory start parameter and store * the array there. */ static struct { unsigned long address; unsigned short segment; } bios32_indirect = { 0, __KERNEL_CS }; /* * Returns the entry point for the given service, NULL on error */ static unsigned long bios32_service(unsigned long service) { unsigned char return_code; /* %al */ unsigned long address; /* %ebx */ unsigned long length; /* %ecx */ unsigned long entry; /* %edx */ unsigned long flags; __save_flags(flags); __cli(); __asm__("lcall (%%edi); cld" : "=a" (return_code), "=b" (address), "=c" (length), "=d" (entry) : "0" (service), "1" (0), "D" (&bios32_indirect)); __restore_flags(flags); switch (return_code) { case 0: return address + entry; case 0x80: /* Not present */ printk("bios32_service(0x%lx): not present\n", service); return 0; default: /* Shouldn't happen */ printk("bios32_service(0x%lx): returned 0x%x -- BIOS bug!\n", service, return_code); return 0; } } static struct { unsigned long address; unsigned short segment; } pci_indirect = { 0, __KERNEL_CS }; static int pci_bios_present; static int __devinit check_pcibios(void) { u32 signature, eax, ebx, ecx; u8 status, major_ver, minor_ver, hw_mech; unsigned long flags, pcibios_entry; if ((pcibios_entry = bios32_service(PCI_SERVICE))) { pci_indirect.address = pcibios_entry + PAGE_OFFSET; __save_flags(flags); __cli(); __asm__( "lcall (%%edi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=d" (signature), "=a" (eax), "=b" (ebx), "=c" (ecx) : "1" (PCIBIOS_PCI_BIOS_PRESENT), "D" (&pci_indirect) : "memory"); __restore_flags(flags); status = (eax >> 8) & 0xff; hw_mech = eax & 0xff; major_ver = (ebx >> 8) & 0xff; minor_ver = ebx & 0xff; if (pcibios_last_bus < 0) pcibios_last_bus = ecx & 0xff; DBG("PCI: BIOS probe returned s=%02x hw=%02x ver=%02x.%02x l=%02x\n", status, hw_mech, major_ver, minor_ver, pcibios_last_bus); if (status || signature != PCI_SIGNATURE) { printk (KERN_ERR "PCI: BIOS BUG #%x[%08x] found\n", status, signature); return 0; } printk("PCI: PCI BIOS revision %x.%02x entry at 0x%lx, last bus=%d\n", major_ver, minor_ver, pcibios_entry, pcibios_last_bus); #ifdef CONFIG_PCI_DIRECT if (!(hw_mech & PCIBIOS_HW_TYPE1)) pci_probe &= ~PCI_PROBE_CONF1; if (!(hw_mech & PCIBIOS_HW_TYPE2)) pci_probe &= ~PCI_PROBE_CONF2; #endif return 1; } return 0; } static int __devinit pci_bios_find_device (unsigned short vendor, unsigned short device_id, unsigned short index, unsigned char *bus, unsigned char *device_fn) { unsigned short bx; unsigned short ret; __asm__("lcall (%%edi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=b" (bx), "=a" (ret) : "1" (PCIBIOS_FIND_PCI_DEVICE), "c" (device_id), "d" (vendor), "S" ((int) index), "D" (&pci_indirect)); *bus = (bx >> 8) & 0xff; *device_fn = bx & 0xff; return (int) (ret & 0xff00) >> 8; } static int pci_bios_read (int seg, int bus, int dev, int fn, int reg, int len, u32 *value) { unsigned long result = 0; unsigned long flags; unsigned long bx = ((bus << 8) | (dev << 3) | fn); if (!value || (bus > 255) || (dev > 31) || (fn > 7) || (reg > 255)) return -EINVAL; spin_lock_irqsave(&pci_config_lock, flags); switch (len) { case 1: __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=c" (*value), "=a" (result) : "1" (PCIBIOS_READ_CONFIG_BYTE), "b" (bx), "D" ((long)reg), "S" (&pci_indirect)); break; case 2: __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=c" (*value), "=a" (result) : "1" (PCIBIOS_READ_CONFIG_WORD), "b" (bx), "D" ((long)reg), "S" (&pci_indirect)); break; case 4: __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=c" (*value), "=a" (result) : "1" (PCIBIOS_READ_CONFIG_DWORD), "b" (bx), "D" ((long)reg), "S" (&pci_indirect)); break; } spin_unlock_irqrestore(&pci_config_lock, flags); return (int)((result & 0xff00) >> 8); } static int pci_bios_write (int seg, int bus, int dev, int fn, int reg, int len, u32 value) { unsigned long result = 0; unsigned long flags; unsigned long bx = ((bus << 8) | (dev << 3) | fn); if ((bus > 255) || (dev > 31) || (fn > 7) || (reg > 255)) return -EINVAL; spin_lock_irqsave(&pci_config_lock, flags); switch (len) { case 1: __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=a" (result) : "0" (PCIBIOS_WRITE_CONFIG_BYTE), "c" (value), "b" (bx), "D" ((long)reg), "S" (&pci_indirect)); break; case 2: __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=a" (result) : "0" (PCIBIOS_WRITE_CONFIG_WORD), "c" (value), "b" (bx), "D" ((long)reg), "S" (&pci_indirect)); break; case 4: __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=a" (result) : "0" (PCIBIOS_WRITE_CONFIG_DWORD), "c" (value), "b" (bx), "D" ((long)reg), "S" (&pci_indirect)); break; } spin_unlock_irqrestore(&pci_config_lock, flags); return (int)((result & 0xff00) >> 8); } static int pci_bios_read_config_byte(struct pci_dev *dev, int where, u8 *value) { int result; u32 data; if (!value) return -EINVAL; result = pci_bios_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 1, &data); *value = (u8)data; return result; } static int pci_bios_read_config_word(struct pci_dev *dev, int where, u16 *value) { int result; u32 data; if (!value) return -EINVAL; result = pci_bios_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 2, &data); *value = (u16)data; return result; } static int pci_bios_read_config_dword(struct pci_dev *dev, int where, u32 *value) { if (!value) return -EINVAL; return pci_bios_read(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 4, value); } static int pci_bios_write_config_byte(struct pci_dev *dev, int where, u8 value) { return pci_bios_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 1, value); } static int pci_bios_write_config_word(struct pci_dev *dev, int where, u16 value) { return pci_bios_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 2, value); } static int pci_bios_write_config_dword(struct pci_dev *dev, int where, u32 value) { return pci_bios_write(0, dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn), where, 4, value); } /* * Function table for BIOS32 access */ static struct pci_ops pci_bios_access = { pci_bios_read_config_byte, pci_bios_read_config_word, pci_bios_read_config_dword, pci_bios_write_config_byte, pci_bios_write_config_word, pci_bios_write_config_dword }; /* * Try to find PCI BIOS. */ static struct pci_ops * __devinit pci_find_bios(void) { union bios32 *check; unsigned char sum; int i, length; /* * Follow the standard procedure for locating the BIOS32 Service * directory by scanning the permissible address range from * 0xe0000 through 0xfffff for a valid BIOS32 structure. */ for (check = (union bios32 *) __va(0xe0000); check <= (union bios32 *) __va(0xffff0); ++check) { if (check->fields.signature != BIOS32_SIGNATURE) continue; length = check->fields.length * 16; if (!length) continue; sum = 0; for (i = 0; i < length ; ++i) sum += check->chars[i]; if (sum != 0) continue; if (check->fields.revision != 0) { printk("PCI: unsupported BIOS32 revision %d at 0x%p\n", check->fields.revision, check); continue; } DBG("PCI: BIOS32 Service Directory structure at 0x%p\n", check); if (check->fields.entry >= 0x100000) { printk("PCI: BIOS32 entry (0x%p) in high memory, cannot use.\n", check); return NULL; } else { unsigned long bios32_entry = check->fields.entry; DBG("PCI: BIOS32 Service Directory entry at 0x%lx\n", bios32_entry); bios32_indirect.address = bios32_entry + PAGE_OFFSET; if (check_pcibios()) return &pci_bios_access; } break; /* Hopefully more than one BIOS32 cannot happen... */ } return NULL; } /* * Sort the device list according to PCI BIOS. Nasty hack, but since some * fool forgot to define the `correct' device order in the PCI BIOS specs * and we want to be (possibly bug-to-bug ;-]) compatible with older kernels * which used BIOS ordering, we are bound to do this... */ static void __devinit pcibios_sort(void) { LIST_HEAD(sorted_devices); struct list_head *ln; struct pci_dev *dev, *d; int idx, found; unsigned char bus, devfn; DBG("PCI: Sorting device list...\n"); while (!list_empty(&pci_devices)) { ln = pci_devices.next; dev = pci_dev_g(ln); idx = found = 0; while (pci_bios_find_device(dev->vendor, dev->device, idx, &bus, &devfn) == PCIBIOS_SUCCESSFUL) { idx++; for (ln=pci_devices.next; ln != &pci_devices; ln=ln->next) { d = pci_dev_g(ln); if (d->bus->number == bus && d->devfn == devfn) { list_del(&d->global_list); list_add_tail(&d->global_list, &sorted_devices); if (d == dev) found = 1; break; } } if (ln == &pci_devices) { printk("PCI: BIOS reporting unknown device %02x:%02x\n", bus, devfn); /* * We must not continue scanning as several buggy BIOSes * return garbage after the last device. Grr. */ break; } } if (!found) { printk("PCI: Device %02x:%02x not found by BIOS\n", dev->bus->number, dev->devfn); list_del(&dev->global_list); list_add_tail(&dev->global_list, &sorted_devices); } } list_splice(&sorted_devices, &pci_devices); } /* * BIOS Functions for IRQ Routing */ struct irq_routing_options { u16 size; struct irq_info *table; u16 segment; } __attribute__((packed)); struct irq_routing_table * __devinit pcibios_get_irq_routing_table(void) { struct irq_routing_options opt; struct irq_routing_table *rt = NULL; int ret, map; unsigned long page; if (!pci_bios_present) return NULL; page = __get_free_page(GFP_KERNEL); if (!page) return NULL; opt.table = (struct irq_info *) page; opt.size = PAGE_SIZE; opt.segment = __KERNEL_DS; DBG("PCI: Fetching IRQ routing table... "); __asm__("push %%es\n\t" "push %%ds\n\t" "pop %%es\n\t" "lcall (%%esi); cld\n\t" "pop %%es\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=a" (ret), "=b" (map) : "0" (PCIBIOS_GET_ROUTING_OPTIONS), "1" (0), "D" ((long) &opt), "S" (&pci_indirect)); DBG("OK ret=%d, size=%d, map=%x\n", ret, opt.size, map); if (ret & 0xff00) printk(KERN_ERR "PCI: Error %02x when fetching IRQ routing table.\n", (ret >> 8) & 0xff); else if (opt.size) { rt = kmalloc(sizeof(struct irq_routing_table) + opt.size, GFP_KERNEL); if (rt) { memset(rt, 0, sizeof(struct irq_routing_table)); rt->size = opt.size + sizeof(struct irq_routing_table); rt->exclusive_irqs = map; memcpy(rt->slots, (void *) page, opt.size); printk("PCI: Using BIOS Interrupt Routing Table\n"); } } free_page(page); return rt; } int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq) { int ret; __asm__("lcall (%%esi); cld\n\t" "jc 1f\n\t" "xor %%ah, %%ah\n" "1:" : "=a" (ret) : "0" (PCIBIOS_SET_PCI_HW_INT), "b" ((dev->bus->number << 8) | dev->devfn), "c" ((irq << 8) | (pin + 10)), "S" (&pci_indirect)); return !(ret & 0xff00); } #endif /* * Several buggy motherboards address only 16 devices and mirror * them to next 16 IDs. We try to detect this `feature' on all * primary buses (those containing host bridges as they are * expected to be unique) and remove the ghost devices. */ static void __devinit pcibios_fixup_ghosts(struct pci_bus *b) { struct list_head *ln, *mn; struct pci_dev *d, *e; int mirror = PCI_DEVFN(16,0); int seen_host_bridge = 0; int i; DBG("PCI: Scanning for ghost devices on bus %d\n", b->number); for (ln=b->devices.next; ln != &b->devices; ln=ln->next) { d = pci_dev_b(ln); if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST) seen_host_bridge++; for (mn=ln->next; mn != &b->devices; mn=mn->next) { e = pci_dev_b(mn); if (e->devfn != d->devfn + mirror || e->vendor != d->vendor || e->device != d->device || e->class != d->class) continue; for(i=0; iresource[i].start != d->resource[i].start || e->resource[i].end != d->resource[i].end || e->resource[i].flags != d->resource[i].flags) continue; break; } if (mn == &b->devices) return; } if (!seen_host_bridge) return; printk("PCI: Ignoring ghost devices on bus %02x\n", b->number); ln = &b->devices; while (ln->next != &b->devices) { d = pci_dev_b(ln->next); if (d->devfn >= mirror) { list_del(&d->global_list); list_del(&d->bus_list); kfree(d); } else ln = ln->next; } } /* * Discover remaining PCI buses in case there are peer host bridges. * We use the number of last PCI bus provided by the PCI BIOS. */ static void __devinit pcibios_fixup_peer_bridges(void) { int n; struct pci_bus bus; struct pci_dev dev; u16 l; if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff) return; DBG("PCI: Peer bridge fixup\n"); for (n=0; n <= pcibios_last_bus; n++) { if (pci_bus_exists(&pci_root_buses, n)) continue; bus.number = n; bus.ops = pci_root_ops; dev.bus = &bus; for(dev.devfn=0; dev.devfn<256; dev.devfn += 8) if (!pci_read_config_word(&dev, PCI_VENDOR_ID, &l) && l != 0x0000 && l != 0xffff) { DBG("Found device at %02x:%02x [%04x]\n", n, dev.devfn, l); printk("PCI: Discovered peer bus %02x\n", n); pci_scan_bus(n, pci_root_ops, NULL); break; } } } /* * Exceptions for specific devices. Usually work-arounds for fatal design flaws. */ static void __devinit pci_fixup_i450nx(struct pci_dev *d) { /* * i450NX -- Find and scan all secondary buses on all PXB's. */ int pxb, reg; u8 busno, suba, subb; printk("PCI: Searching for i450NX host bridges on %s\n", d->slot_name); reg = 0xd0; for(pxb=0; pxb<2; pxb++) { pci_read_config_byte(d, reg++, &busno); pci_read_config_byte(d, reg++, &suba); pci_read_config_byte(d, reg++, &subb); DBG("i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno, suba, subb); if (busno) pci_scan_bus(busno, pci_root_ops, NULL); /* Bus A */ if (suba < subb) pci_scan_bus(suba+1, pci_root_ops, NULL); /* Bus B */ } pcibios_last_bus = -1; } static void __devinit pci_fixup_i450gx(struct pci_dev *d) { /* * i450GX and i450KX -- Find and scan all secondary buses. * (called separately for each PCI bridge found) */ u8 busno; pci_read_config_byte(d, 0x4a, &busno); printk("PCI: i440KX/GX host bridge %s: secondary bus %02x\n", d->slot_name, busno); pci_scan_bus(busno, pci_root_ops, NULL); pcibios_last_bus = -1; } static void __devinit pci_fixup_umc_ide(struct pci_dev *d) { /* * UM8886BF IDE controller sets region type bits incorrectly, * therefore they look like memory despite of them being I/O. */ int i; printk("PCI: Fixing base address flags for device %s\n", d->slot_name); for(i=0; i<4; i++) d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO; } static void __devinit pci_fixup_ide_bases(struct pci_dev *d) { int i; /* * PCI IDE controllers use non-standard I/O port decoding, respect it. */ if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE) return; DBG("PCI: IDE base address fixup for %s\n", d->slot_name); for(i=0; i<4; i++) { struct resource *r = &d->resource[i]; if ((r->start & ~0x80) == 0x374) { r->start |= 2; r->end = r->start; } } } static void __devinit pci_fixup_ide_trash(struct pci_dev *d) { int i; /* * There exist PCI IDE controllers which have utter garbage * in first four base registers. Ignore that. */ DBG("PCI: IDE base address trash cleared for %s\n", d->slot_name); for(i=0; i<4; i++) d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0; } static void __devinit pci_fixup_latency(struct pci_dev *d) { /* * SiS 5597 and 5598 chipsets require latency timer set to * at most 32 to avoid lockups. */ DBG("PCI: Setting max latency to 32\n"); pcibios_max_latency = 32; } static void __devinit pci_fixup_piix4_acpi(struct pci_dev *d) { /* * PIIX4 ACPI device: hardwired IRQ9 */ d->irq = 9; } /* * Nobody seems to know what this does. Damn. * * But it does seem to fix some unspecified problem * with 'movntq' copies on Athlons. * * VIA 8363 chipset: * - bit 7 at offset 0x55: Debug (RW) */ static void __init pci_fixup_via_athlon_bug(struct pci_dev *d) { u8 v; pci_read_config_byte(d, 0x55, &v); if (v & 0x80) { printk("Trying to stomp on Athlon bug...\n"); v &= 0x7f; /* clear bit 55.7 */ pci_write_config_byte(d, 0x55, v); } } struct pci_fixup pcibios_fixups[] = { { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash }, { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_athlon_bug }, { 0 } }; /* * Called after each bus is probed, but before its children * are examined. */ void __devinit pcibios_fixup_bus(struct pci_bus *b) { pcibios_fixup_ghosts(b); pci_read_bridge_bases(b); } void __devinit pcibios_config_init(void) { /* * Try all known PCI access methods. Note that we support using * both PCI BIOS and direct access, with a preference for direct. */ #ifdef CONFIG_PCI_BIOS if ((pci_probe & PCI_PROBE_BIOS) && ((pci_root_ops = pci_find_bios()))) { pci_probe |= PCI_BIOS_SORT; pci_bios_present = 1; pci_config_read = pci_bios_read; pci_config_write = pci_bios_write; } #endif #ifdef CONFIG_PCI_DIRECT if ((pci_probe & (PCI_PROBE_CONF1 | PCI_PROBE_CONF2)) && (pci_root_ops = pci_check_direct())) { if (pci_root_ops == &pci_direct_conf1) { pci_config_read = pci_conf1_read; pci_config_write = pci_conf1_write; } else { pci_config_read = pci_conf2_read; pci_config_write = pci_conf2_write; } } #endif return; } void __init pcibios_init(void) { if (!pci_root_ops) pcibios_config_init(); if (!pci_root_ops) { printk("PCI: System does not support PCI\n"); return; } printk("PCI: Probing PCI hardware\n"); pci_root_bus = pci_scan_bus(0, pci_root_ops, NULL); pcibios_irq_init(); pcibios_fixup_peer_bridges(); pcibios_fixup_irqs(); pcibios_resource_survey(); #ifdef CONFIG_PCI_BIOS if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT)) pcibios_sort(); #endif } char * __devinit pcibios_setup(char *str) { if (!strcmp(str, "off")) { pci_probe = 0; return NULL; } #ifdef CONFIG_PCI_BIOS else if (!strcmp(str, "bios")) { pci_probe = PCI_PROBE_BIOS; return NULL; } else if (!strcmp(str, "nobios")) { pci_probe &= ~PCI_PROBE_BIOS; return NULL; } else if (!strcmp(str, "nosort")) { pci_probe |= PCI_NO_SORT; return NULL; } else if (!strcmp(str, "biosirq")) { pci_probe |= PCI_BIOS_IRQ_SCAN; return NULL; } #endif #ifdef CONFIG_PCI_DIRECT else if (!strcmp(str, "conf1")) { pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS; return NULL; } else if (!strcmp(str, "conf2")) { pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS; return NULL; } #endif else if (!strcmp(str, "rom")) { pci_probe |= PCI_ASSIGN_ROMS; return NULL; } else if (!strcmp(str, "assign-busses")) { pci_probe |= PCI_ASSIGN_ALL_BUSSES; return NULL; } else if (!strncmp(str, "irqmask=", 8)) { pcibios_irq_mask = simple_strtol(str+8, NULL, 0); return NULL; } else if (!strncmp(str, "lastbus=", 8)) { pcibios_last_bus = simple_strtol(str+8, NULL, 0); return NULL; } return str; } unsigned int pcibios_assign_all_busses(void) { return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0; } int pcibios_enable_device(struct pci_dev *dev) { int err; if ((err = pcibios_enable_resources(dev)) < 0) return err; pcibios_enable_irq(dev); return 0; }