pci_common.c
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- /* $Id: pci_common.c,v 1.27.2.2 2002/02/01 00:56:44 davem Exp $
- * pci_common.c: PCI controller common support.
- *
- * Copyright (C) 1999 David S. Miller (davem@redhat.com)
- */
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <asm/pbm.h>
- /* Fix self device of BUS and hook it into BUS->self.
- * The pci_scan_bus does not do this for the host bridge.
- */
- void __init pci_fixup_host_bridge_self(struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- walk = walk->next;
- while (walk != &pbus->devices) {
- struct pci_dev *pdev = pci_dev_b(walk);
- if (pdev->class >> 8 == PCI_CLASS_BRIDGE_HOST) {
- pbus->self = pdev;
- return;
- }
- walk = walk->next;
- }
- prom_printf("PCI: Critical error, cannot find host bridge PDEV.n");
- prom_halt();
- }
- /* Find the OBP PROM device tree node for a PCI device.
- * Return zero if not found.
- */
- static int __init find_device_prom_node(struct pci_pbm_info *pbm,
- struct pci_dev *pdev,
- int bus_prom_node,
- struct linux_prom_pci_registers *pregs,
- int *nregs)
- {
- int node;
- /*
- * Return the PBM's PROM node in case we are it's PCI device,
- * as the PBM's reg property is different to standard PCI reg
- * properties. We would delete this device entry otherwise,
- * which confuses XFree86's device probing...
- */
- if ((pdev->bus->number == pbm->pci_bus->number) && (pdev->devfn == 0) &&
- (pdev->vendor == PCI_VENDOR_ID_SUN) &&
- (pdev->device == PCI_DEVICE_ID_SUN_PBM ||
- pdev->device == PCI_DEVICE_ID_SUN_SCHIZO ||
- pdev->device == PCI_DEVICE_ID_SUN_SABRE ||
- pdev->device == PCI_DEVICE_ID_SUN_HUMMINGBIRD)) {
- *nregs = 0;
- return bus_prom_node;
- }
- node = prom_getchild(bus_prom_node);
- while (node != 0) {
- int err = prom_getproperty(node, "reg",
- (char *)pregs,
- sizeof(*pregs) * PROMREG_MAX);
- if (err == 0 || err == -1)
- goto do_next_sibling;
- if (((pregs[0].phys_hi >> 8) & 0xff) == pdev->devfn) {
- *nregs = err / sizeof(*pregs);
- return node;
- }
- do_next_sibling:
- node = prom_getsibling(node);
- }
- return 0;
- }
- /* Remove a PCI device from the device trees, then
- * free it up. Note that this must run before
- * the device's resources are registered because we
- * do not handle unregistering them here.
- */
- static void pci_device_delete(struct pci_dev *pdev)
- {
- list_del(&pdev->global_list);
- list_del(&pdev->bus_list);
- /* Ok, all references are gone, free it up. */
- kfree(pdev);
- }
- /* Older versions of OBP on PCI systems encode 64-bit MEM
- * space assignments incorrectly, this fixes them up. We also
- * take the opportunity here to hide other kinds of bogus
- * assignments.
- */
- static void __init fixup_obp_assignments(struct pci_dev *pdev,
- struct pcidev_cookie *pcp)
- {
- int i;
- if (pdev->vendor == PCI_VENDOR_ID_AL &&
- (pdev->device == PCI_DEVICE_ID_AL_M7101 ||
- pdev->device == PCI_DEVICE_ID_AL_M1533)) {
- int i;
- /* Zap all of the normal resources, they are
- * meaningless and generate bogus resource collision
- * messages. This is OpenBoot's ill-fated attempt to
- * represent the implicit resources that these devices
- * have.
- */
- pcp->num_prom_assignments = 0;
- for (i = 0; i < 6; i++) {
- pdev->resource[i].start =
- pdev->resource[i].end =
- pdev->resource[i].flags = 0;
- }
- pdev->resource[PCI_ROM_RESOURCE].start =
- pdev->resource[PCI_ROM_RESOURCE].end =
- pdev->resource[PCI_ROM_RESOURCE].flags = 0;
- return;
- }
- for (i = 0; i < pcp->num_prom_assignments; i++) {
- struct linux_prom_pci_registers *ap;
- int space;
- ap = &pcp->prom_assignments[i];
- space = ap->phys_hi >> 24;
- if ((space & 0x3) == 2 &&
- (space & 0x4) != 0) {
- ap->phys_hi &= ~(0x7 << 24);
- ap->phys_hi |= 0x3 << 24;
- }
- }
- }
- /* Fill in the PCI device cookie sysdata for the given
- * PCI device. This cookie is the means by which one
- * can get to OBP and PCI controller specific information
- * for a PCI device.
- */
- static void __init pdev_cookie_fillin(struct pci_pbm_info *pbm,
- struct pci_dev *pdev,
- int bus_prom_node)
- {
- struct linux_prom_pci_registers pregs[PROMREG_MAX];
- struct pcidev_cookie *pcp;
- int device_prom_node, nregs, err;
- device_prom_node = find_device_prom_node(pbm, pdev, bus_prom_node,
- pregs, &nregs);
- if (device_prom_node == 0) {
- /* If it is not in the OBP device tree then
- * there must be a damn good reason for it.
- *
- * So what we do is delete the device from the
- * PCI device tree completely. This scenerio
- * is seen, for example, on CP1500 for the
- * second EBUS/HappyMeal pair if the external
- * connector for it is not present.
- */
- pci_device_delete(pdev);
- return;
- }
- pcp = kmalloc(sizeof(*pcp), GFP_ATOMIC);
- if (pcp == NULL) {
- prom_printf("PCI_COOKIE: Fatal malloc error, aborting...n");
- prom_halt();
- }
- pcp->pbm = pbm;
- pcp->prom_node = device_prom_node;
- memcpy(pcp->prom_regs, pregs, sizeof(pcp->prom_regs));
- pcp->num_prom_regs = nregs;
- err = prom_getproperty(device_prom_node, "name",
- pcp->prom_name, sizeof(pcp->prom_name));
- if (err > 0)
- pcp->prom_name[err] = 0;
- else
- pcp->prom_name[0] = 0;
- err = prom_getproperty(device_prom_node,
- "assigned-addresses",
- (char *)pcp->prom_assignments,
- sizeof(pcp->prom_assignments));
- if (err == 0 || err == -1)
- pcp->num_prom_assignments = 0;
- else
- pcp->num_prom_assignments =
- (err / sizeof(pcp->prom_assignments[0]));
- if (strcmp(pcp->prom_name, "ebus") == 0) {
- struct linux_prom_ebus_ranges erng[PROM_PCIRNG_MAX];
- int iter;
- /* EBUS is special... */
- err = prom_getproperty(device_prom_node, "ranges",
- (char *)&erng[0], sizeof(erng));
- if (err == 0 || err == -1) {
- prom_printf("EBUS: Fatal error, no range propertyn");
- prom_halt();
- }
- err = (err / sizeof(erng[0]));
- for(iter = 0; iter < err; iter++) {
- struct linux_prom_ebus_ranges *ep = &erng[iter];
- struct linux_prom_pci_registers *ap;
- ap = &pcp->prom_assignments[iter];
- ap->phys_hi = ep->parent_phys_hi;
- ap->phys_mid = ep->parent_phys_mid;
- ap->phys_lo = ep->parent_phys_lo;
- ap->size_hi = 0;
- ap->size_lo = ep->size;
- }
- pcp->num_prom_assignments = err;
- }
- fixup_obp_assignments(pdev, pcp);
- pdev->sysdata = pcp;
- }
- void __init pci_fill_in_pbm_cookies(struct pci_bus *pbus,
- struct pci_pbm_info *pbm,
- int prom_node)
- {
- struct list_head *walk = &pbus->devices;
- /* This loop is coded like this because the cookie
- * fillin routine can delete devices from the tree.
- */
- walk = walk->next;
- while (walk != &pbus->devices) {
- struct pci_dev *pdev = pci_dev_b(walk);
- struct list_head *walk_next = walk->next;
- pdev_cookie_fillin(pbm, pdev, prom_node);
- walk = walk_next;
- }
- walk = &pbus->children;
- walk = walk->next;
- while (walk != &pbus->children) {
- struct pci_bus *this_pbus = pci_bus_b(walk);
- struct pcidev_cookie *pcp = this_pbus->self->sysdata;
- struct list_head *walk_next = walk->next;
- pci_fill_in_pbm_cookies(this_pbus, pbm, pcp->prom_node);
- walk = walk_next;
- }
- }
- static void __init bad_assignment(struct pci_dev *pdev,
- struct linux_prom_pci_registers *ap,
- struct resource *res,
- int do_prom_halt)
- {
- prom_printf("PCI: Bogus PROM assignment. BUS[%02x] DEVFN[%x]n",
- pdev->bus->number, pdev->devfn);
- if (ap)
- prom_printf("PCI: phys[%08x:%08x:%08x] size[%08x:%08x]n",
- ap->phys_hi, ap->phys_mid, ap->phys_lo,
- ap->size_hi, ap->size_lo);
- if (res)
- prom_printf("PCI: RES[%016lx-->%016lx:(%lx)]n",
- res->start, res->end, res->flags);
- prom_printf("Please email this information to davem@redhat.comn");
- if (do_prom_halt)
- prom_halt();
- }
- static struct resource *
- __init get_root_resource(struct linux_prom_pci_registers *ap,
- struct pci_pbm_info *pbm)
- {
- int space = (ap->phys_hi >> 24) & 3;
- switch (space) {
- case 0:
- /* Configuration space, silently ignore it. */
- return NULL;
- case 1:
- /* 16-bit IO space */
- return &pbm->io_space;
- case 2:
- /* 32-bit MEM space */
- return &pbm->mem_space;
- case 3:
- /* 64-bit MEM space, these are allocated out of
- * the 32-bit mem_space range for the PBM, ie.
- * we just zero out the upper 32-bits.
- */
- return &pbm->mem_space;
- default:
- printk("PCI: What is resource space %x? "
- "Tell davem@redhat.com about it!n", space);
- return NULL;
- };
- }
- static struct resource *
- __init get_device_resource(struct linux_prom_pci_registers *ap,
- struct pci_dev *pdev)
- {
- struct resource *res;
- int breg = (ap->phys_hi & 0xff);
- int space = (ap->phys_hi >> 24) & 3;
- switch (breg) {
- case PCI_ROM_ADDRESS:
- /* It had better be MEM space. */
- if (space != 2)
- bad_assignment(pdev, ap, NULL, 0);
- res = &pdev->resource[PCI_ROM_RESOURCE];
- break;
- case PCI_BASE_ADDRESS_0:
- case PCI_BASE_ADDRESS_1:
- case PCI_BASE_ADDRESS_2:
- case PCI_BASE_ADDRESS_3:
- case PCI_BASE_ADDRESS_4:
- case PCI_BASE_ADDRESS_5:
- res = &pdev->resource[(breg - PCI_BASE_ADDRESS_0) / 4];
- break;
- default:
- bad_assignment(pdev, ap, NULL, 0);
- res = NULL;
- break;
- };
- return res;
- }
- static int __init pdev_resource_collisions_expected(struct pci_dev *pdev)
- {
- if (pdev->vendor != PCI_VENDOR_ID_SUN)
- return 0;
- if (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS ||
- pdev->device == PCI_DEVICE_ID_SUN_RIO_1394 ||
- pdev->device == PCI_DEVICE_ID_SUN_RIO_USB)
- return 1;
- return 0;
- }
- static void __init pdev_record_assignments(struct pci_pbm_info *pbm,
- struct pci_dev *pdev)
- {
- struct pcidev_cookie *pcp = pdev->sysdata;
- int i;
- for (i = 0; i < pcp->num_prom_assignments; i++) {
- struct linux_prom_pci_registers *ap;
- struct resource *root, *res;
- /* The format of this property is specified in
- * the PCI Bus Binding to IEEE1275-1994.
- */
- ap = &pcp->prom_assignments[i];
- root = get_root_resource(ap, pbm);
- res = get_device_resource(ap, pdev);
- if (root == NULL || res == NULL ||
- res->flags == 0)
- continue;
- /* Ok we know which resource this PROM assignment is
- * for, sanity check it.
- */
- if ((res->start & 0xffffffffUL) != ap->phys_lo)
- bad_assignment(pdev, ap, res, 1);
- /* If it is a 64-bit MEM space assignment, verify that
- * the resource is too and that the upper 32-bits match.
- */
- if (((ap->phys_hi >> 24) & 3) == 3) {
- if (((res->flags & IORESOURCE_MEM) == 0) ||
- ((res->flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK)
- != PCI_BASE_ADDRESS_MEM_TYPE_64))
- bad_assignment(pdev, ap, res, 1);
- if ((res->start >> 32) != ap->phys_mid)
- bad_assignment(pdev, ap, res, 1);
- /* PBM cannot generate cpu initiated PIOs
- * to the full 64-bit space. Therefore the
- * upper 32-bits better be zero. If it is
- * not, just skip it and we will assign it
- * properly ourselves.
- */
- if ((res->start >> 32) != 0UL) {
- printk(KERN_ERR "PCI: OBP assigns out of range MEM address "
- "%016lx for region %ld on device %sn",
- res->start, (res - &pdev->resource[0]), pdev->name);
- continue;
- }
- }
- /* Adjust the resource into the physical address space
- * of this PBM.
- */
- pbm->parent->resource_adjust(pdev, res, root);
- if (request_resource(root, res) < 0) {
- /* OK, there is some conflict. But this is fine
- * since we'll reassign it in the fixup pass.
- *
- * We notify the user that OBP made an error if it
- * is a case we don't expect.
- */
- if (!pdev_resource_collisions_expected(pdev)) {
- printk(KERN_ERR "PCI: Address space collision on region %ld "
- "[%016lx:%016lx] of device %sn",
- (res - &pdev->resource[0]),
- res->start, res->end,
- pdev->name);
- }
- }
- }
- }
- void __init pci_record_assignments(struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next)
- pdev_record_assignments(pbm, pci_dev_b(walk));
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_record_assignments(pbm, pci_bus_b(walk));
- }
- /* Return non-zero if PDEV has implicit I/O resources even
- * though it may not have an I/O base address register
- * active.
- */
- static int __init has_implicit_io(struct pci_dev *pdev)
- {
- int class = pdev->class >> 8;
- if (class == PCI_CLASS_NOT_DEFINED ||
- class == PCI_CLASS_NOT_DEFINED_VGA ||
- class == PCI_CLASS_STORAGE_IDE ||
- (pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
- return 1;
- return 0;
- }
- static void __init pdev_assign_unassigned(struct pci_pbm_info *pbm,
- struct pci_dev *pdev)
- {
- u32 reg;
- u16 cmd;
- int i, io_seen, mem_seen;
- io_seen = mem_seen = 0;
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- struct resource *root, *res;
- unsigned long size, min, max, align;
- res = &pdev->resource[i];
- if (res->flags & IORESOURCE_IO)
- io_seen++;
- else if (res->flags & IORESOURCE_MEM)
- mem_seen++;
- /* If it is already assigned or the resource does
- * not exist, there is nothing to do.
- */
- if (res->parent != NULL || res->flags == 0UL)
- continue;
- /* Determine the root we allocate from. */
- if (res->flags & IORESOURCE_IO) {
- root = &pbm->io_space;
- min = root->start + 0x400UL;
- max = root->end;
- } else {
- root = &pbm->mem_space;
- min = root->start;
- max = min + 0x80000000UL;
- }
- size = res->end - res->start;
- align = size + 1;
- if (allocate_resource(root, res, size + 1, min, max, align, NULL, NULL) < 0) {
- /* uh oh */
- prom_printf("PCI: Failed to allocate resource %d for %sn",
- i, pdev->name);
- prom_halt();
- }
- /* Update PCI config space. */
- pbm->parent->base_address_update(pdev, i);
- }
- /* Special case, disable the ROM. Several devices
- * act funny (ie. do not respond to memory space writes)
- * when it is left enabled. A good example are Qlogic,ISP
- * adapters.
- */
- pci_read_config_dword(pdev, PCI_ROM_ADDRESS, ®);
- reg &= ~PCI_ROM_ADDRESS_ENABLE;
- pci_write_config_dword(pdev, PCI_ROM_ADDRESS, reg);
- /* If we saw I/O or MEM resources, enable appropriate
- * bits in PCI command register.
- */
- if (io_seen || mem_seen) {
- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
- if (io_seen || has_implicit_io(pdev))
- cmd |= PCI_COMMAND_IO;
- if (mem_seen)
- cmd |= PCI_COMMAND_MEMORY;
- pci_write_config_word(pdev, PCI_COMMAND, cmd);
- }
- /* If this is a PCI bridge or an IDE controller,
- * enable bus mastering. In the former case also
- * set the cache line size correctly.
- */
- if (((pdev->class >> 8) == PCI_CLASS_BRIDGE_PCI) ||
- (((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) &&
- ((pdev->class & 0x80) != 0))) {
- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
- cmd |= PCI_COMMAND_MASTER;
- pci_write_config_word(pdev, PCI_COMMAND, cmd);
- if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
- pci_write_config_byte(pdev,
- PCI_CACHE_LINE_SIZE,
- (64 / sizeof(u32)));
- }
- }
- void __init pci_assign_unassigned(struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next)
- pdev_assign_unassigned(pbm, pci_dev_b(walk));
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_assign_unassigned(pbm, pci_bus_b(walk));
- }
- static int __init pci_intmap_match(struct pci_dev *pdev, unsigned int *interrupt)
- {
- struct linux_prom_pci_intmap bridge_local_intmap[PROM_PCIIMAP_MAX], *intmap;
- struct linux_prom_pci_intmask bridge_local_intmask, *intmask;
- struct pcidev_cookie *dev_pcp = pdev->sysdata;
- struct pci_pbm_info *pbm = dev_pcp->pbm;
- struct linux_prom_pci_registers *pregs = dev_pcp->prom_regs;
- unsigned int hi, mid, lo, irq;
- int i, num_intmap;
- if (pbm->num_pbm_intmap == 0)
- return 0;
- intmap = &pbm->pbm_intmap[0];
- intmask = &pbm->pbm_intmask;
- num_intmap = pbm->num_pbm_intmap;
- /* If we are underneath a PCI bridge, use PROM register
- * property of the parent bridge which is closest to
- * the PBM.
- */
- if (pdev->bus->number != pbm->pci_first_busno) {
- struct pcidev_cookie *bus_pcp;
- struct pci_dev *pwalk;
- int offset, plen;
- pwalk = pdev->bus->self;
- while (pwalk->bus &&
- pwalk->bus->number != pbm->pci_first_busno)
- pwalk = pwalk->bus->self;
- bus_pcp = pwalk->sysdata;
- /* But if the PCI bridge has it's own interrupt map
- * and mask properties, use that and the device regs.
- */
- plen = prom_getproperty(bus_pcp->prom_node, "interrupt-map",
- (char *) &bridge_local_intmap[0],
- sizeof(bridge_local_intmap));
- if (plen != -1) {
- intmap = &bridge_local_intmap[0];
- num_intmap = plen / sizeof(struct linux_prom_pci_intmap);
- plen = prom_getproperty(bus_pcp->prom_node, "interrupt-map-mask",
- (char *) &bridge_local_intmask,
- sizeof(bridge_local_intmask));
- if (plen == -1) {
- prom_printf("pbm_intmap_match: Bridge has intmap but "
- "no intmask.n");
- prom_halt();
- }
- goto check_intmap;
- }
- pregs = bus_pcp->prom_regs;
- offset = prom_getint(dev_pcp->prom_node,
- "fcode-rom-offset");
- /* Did PROM know better and assign an interrupt other
- * than #INTA to the device? - We test here for presence of
- * FCODE on the card, in this case we assume PROM has set
- * correct 'interrupts' property, unless it is quadhme.
- */
- if (offset == -1 ||
- !strcmp(dev_pcp->prom_name, "SUNW,qfe") ||
- !strcmp(dev_pcp->prom_name, "qfe")) {
- /*
- * No, use low slot number bits of child as IRQ line.
- */
- *interrupt = ((*interrupt - 1 + PCI_SLOT(pdev->devfn)) & 3) + 1;
- }
- }
- check_intmap:
- hi = pregs->phys_hi & intmask->phys_hi;
- mid = pregs->phys_mid & intmask->phys_mid;
- lo = pregs->phys_lo & intmask->phys_lo;
- irq = *interrupt & intmask->interrupt;
- for (i = 0; i < num_intmap; i++) {
- if (intmap[i].phys_hi == hi &&
- intmap[i].phys_mid == mid &&
- intmap[i].phys_lo == lo &&
- intmap[i].interrupt == irq) {
- *interrupt = intmap[i].cinterrupt;
- return 1;
- }
- }
- prom_printf("pbm_intmap_match: bus %02x, devfn %02x: ",
- pdev->bus->number, pdev->devfn);
- prom_printf("IRQ [%08x.%08x.%08x.%08x] not found in interrupt-mapn",
- pregs->phys_hi, pregs->phys_mid, pregs->phys_lo, *interrupt);
- prom_printf("Please email this information to davem@redhat.comn");
- prom_halt();
- }
- static void __init pdev_fixup_irq(struct pci_dev *pdev)
- {
- struct pcidev_cookie *pcp = pdev->sysdata;
- struct pci_pbm_info *pbm = pcp->pbm;
- struct pci_controller_info *p = pbm->parent;
- unsigned int portid = p->portid;
- unsigned int prom_irq;
- int prom_node = pcp->prom_node;
- int err;
- /* If this is an empty EBUS device, sometimes OBP fails to
- * give it a valid fully specified interrupts property.
- * The EBUS hooked up to SunHME on PCI I/O boards of
- * Ex000 systems is one such case.
- *
- * The interrupt is not important so just ignore it.
- */
- if (pdev->vendor == PCI_VENDOR_ID_SUN &&
- pdev->device == PCI_DEVICE_ID_SUN_EBUS &&
- !prom_getchild(prom_node)) {
- pdev->irq = 0;
- return;
- }
- err = prom_getproperty(prom_node, "interrupts",
- (char *)&prom_irq, sizeof(prom_irq));
- if (err == 0 || err == -1) {
- pdev->irq = 0;
- return;
- }
- /* Fully specified already? */
- if (((prom_irq & PCI_IRQ_IGN) >> 6) == portid) {
- pdev->irq = p->irq_build(pbm, pdev, prom_irq);
- goto have_irq;
- }
- /* An onboard device? (bit 5 set) */
- if ((prom_irq & PCI_IRQ_INO) & 0x20) {
- pdev->irq = p->irq_build(pbm, pdev, (portid << 6 | prom_irq));
- goto have_irq;
- }
- /* Can we find a matching entry in the interrupt-map? */
- if (pci_intmap_match(pdev, &prom_irq)) {
- pdev->irq = p->irq_build(pbm, pdev, (portid << 6) | prom_irq);
- goto have_irq;
- }
- /* Ok, we have to do it the hard way. */
- {
- unsigned int bus, slot, line;
- bus = (pbm == &pbm->parent->pbm_B) ? (1 << 4) : 0;
- /* If we have a legal interrupt property, use it as
- * the IRQ line.
- */
- if (prom_irq > 0 && prom_irq < 5) {
- line = ((prom_irq - 1) & 3);
- } else {
- u8 pci_irq_line;
- /* Else just directly consult PCI config space. */
- pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pci_irq_line);
- line = ((pci_irq_line - 1) & 3);
- }
- /* Now figure out the slot.
- *
- * Basically, device number zero on the top-level bus is
- * always the PCI host controller. Slot 0 is then device 1.
- * PBM A supports two external slots (0 and 1), and PBM B
- * supports 4 external slots (0, 1, 2, and 3). On-board PCI
- * devices are wired to device numbers outside of these
- * ranges. -DaveM
- */
- if (pdev->bus->number == pbm->pci_first_busno) {
- slot = (pdev->devfn >> 3) - pbm->pci_first_slot;
- } else {
- /* Underneath a bridge, use slot number of parent
- * bridge.
- */
- slot = (pdev->bus->self->devfn >> 3) - pbm->pci_first_slot;
- }
- slot = slot << 2;
- pdev->irq = p->irq_build(pbm, pdev,
- ((portid << 6) & PCI_IRQ_IGN) |
- (bus | slot | line));
- }
- have_irq:
- pci_write_config_byte(pdev, PCI_INTERRUPT_LINE,
- pdev->irq & PCI_IRQ_INO);
- }
- void __init pci_fixup_irq(struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next)
- pdev_fixup_irq(pci_dev_b(walk));
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_fixup_irq(pbm, pci_bus_b(walk));
- }
- static void pdev_setup_busmastering(struct pci_dev *pdev, int is_66mhz)
- {
- u16 cmd;
- u8 hdr_type, min_gnt, ltimer;
- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
- cmd |= PCI_COMMAND_MASTER;
- pci_write_config_word(pdev, PCI_COMMAND, cmd);
- /* Read it back, if the mastering bit did not
- * get set, the device does not support bus
- * mastering so we have nothing to do here.
- */
- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
- if ((cmd & PCI_COMMAND_MASTER) == 0)
- return;
- /* Set correct cache line size, 64-byte on all
- * Sparc64 PCI systems. Note that the value is
- * measured in 32-bit words.
- */
- pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
- 64 / sizeof(u32));
- pci_read_config_byte(pdev, PCI_HEADER_TYPE, &hdr_type);
- hdr_type &= ~0x80;
- if (hdr_type != PCI_HEADER_TYPE_NORMAL)
- return;
- /* If the latency timer is already programmed with a non-zero
- * value, assume whoever set it (OBP or whoever) knows what
- * they are doing.
- */
- pci_read_config_byte(pdev, PCI_LATENCY_TIMER, <imer);
- if (ltimer != 0)
- return;
- /* XXX Since I'm tipping off the min grant value to
- * XXX choose a suitable latency timer value, I also
- * XXX considered making use of the max latency value
- * XXX as well. Unfortunately I've seen too many bogusly
- * XXX low settings for it to the point where it lacks
- * XXX any usefulness. In one case, an ethernet card
- * XXX claimed a min grant of 10 and a max latency of 5.
- * XXX Now, if I had two such cards on the same bus I
- * XXX could not set the desired burst period (calculated
- * XXX from min grant) without violating the max latency
- * XXX bound. Duh...
- * XXX
- * XXX I blame dumb PC bios implementors for stuff like
- * XXX this, most of them don't even try to do something
- * XXX sensible with latency timer values and just set some
- * XXX default value (usually 32) into every device.
- */
- pci_read_config_byte(pdev, PCI_MIN_GNT, &min_gnt);
- if (min_gnt == 0) {
- /* If no min_gnt setting then use a default
- * value.
- */
- if (is_66mhz)
- ltimer = 16;
- else
- ltimer = 32;
- } else {
- int shift_factor;
- if (is_66mhz)
- shift_factor = 2;
- else
- shift_factor = 3;
- /* Use a default value when the min_gnt value
- * is erroneously high.
- */
- if (((unsigned int) min_gnt << shift_factor) > 512 ||
- ((min_gnt << shift_factor) & 0xff) == 0) {
- ltimer = 8 << shift_factor;
- } else {
- ltimer = min_gnt << shift_factor;
- }
- }
- pci_write_config_byte(pdev, PCI_LATENCY_TIMER, ltimer);
- }
- void pci_determine_66mhz_disposition(struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk;
- int all_are_66mhz;
- u16 status;
- if (pbm->is_66mhz_capable == 0) {
- all_are_66mhz = 0;
- goto out;
- }
- walk = &pbus->devices;
- all_are_66mhz = 1;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next) {
- struct pci_dev *pdev = pci_dev_b(walk);
- pci_read_config_word(pdev, PCI_STATUS, &status);
- if (!(status & PCI_STATUS_66MHZ)) {
- all_are_66mhz = 0;
- break;
- }
- }
- out:
- pbm->all_devs_66mhz = all_are_66mhz;
- printk("PCI%d(PBM%c): Bus running at %dMHzn",
- pbm->parent->index,
- (pbm == &pbm->parent->pbm_A) ? 'A' : 'B',
- (all_are_66mhz ? 66 : 33));
- }
- void pci_setup_busmastering(struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- int is_66mhz;
- is_66mhz = pbm->is_66mhz_capable && pbm->all_devs_66mhz;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next)
- pdev_setup_busmastering(pci_dev_b(walk), is_66mhz);
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_setup_busmastering(pbm, pci_bus_b(walk));
- }
- void pci_register_legacy_regions(struct resource *io_res,
- struct resource *mem_res)
- {
- struct resource *p;
- /* VGA Video RAM. */
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return;
- memset(p, 0, sizeof(*p));
- p->name = "Video RAM area";
- p->start = mem_res->start + 0xa0000UL;
- p->end = p->start + 0x1ffffUL;
- p->flags = IORESOURCE_BUSY;
- request_resource(mem_res, p);
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return;
- memset(p, 0, sizeof(*p));
- p->name = "System ROM";
- p->start = mem_res->start + 0xf0000UL;
- p->end = p->start + 0xffffUL;
- p->flags = IORESOURCE_BUSY;
- request_resource(mem_res, p);
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return;
- memset(p, 0, sizeof(*p));
- p->name = "Video ROM";
- p->start = mem_res->start + 0xc0000UL;
- p->end = p->start + 0x7fffUL;
- p->flags = IORESOURCE_BUSY;
- request_resource(mem_res, p);
- }
- /* Generic helper routines for PCI error reporting. */
- void pci_scan_for_target_abort(struct pci_controller_info *p,
- struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next) {
- struct pci_dev *pdev = pci_dev_b(walk);
- u16 status, error_bits;
- pci_read_config_word(pdev, PCI_STATUS, &status);
- error_bits =
- (status & (PCI_STATUS_SIG_TARGET_ABORT |
- PCI_STATUS_REC_TARGET_ABORT));
- if (error_bits) {
- pci_write_config_word(pdev, PCI_STATUS, error_bits);
- printk("PCI%d(PBM%c): Device [%s] saw Target Abort [%016x]n",
- p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
- pdev->name, status);
- }
- }
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_scan_for_target_abort(p, pbm, pci_bus_b(walk));
- }
- void pci_scan_for_master_abort(struct pci_controller_info *p,
- struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next) {
- struct pci_dev *pdev = pci_dev_b(walk);
- u16 status, error_bits;
- pci_read_config_word(pdev, PCI_STATUS, &status);
- error_bits =
- (status & (PCI_STATUS_REC_MASTER_ABORT));
- if (error_bits) {
- pci_write_config_word(pdev, PCI_STATUS, error_bits);
- printk("PCI%d(PBM%c): Device [%s] received Master Abort [%016x]n",
- p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
- pdev->name, status);
- }
- }
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_scan_for_master_abort(p, pbm, pci_bus_b(walk));
- }
- void pci_scan_for_parity_error(struct pci_controller_info *p,
- struct pci_pbm_info *pbm,
- struct pci_bus *pbus)
- {
- struct list_head *walk = &pbus->devices;
- for (walk = walk->next; walk != &pbus->devices; walk = walk->next) {
- struct pci_dev *pdev = pci_dev_b(walk);
- u16 status, error_bits;
- pci_read_config_word(pdev, PCI_STATUS, &status);
- error_bits =
- (status & (PCI_STATUS_PARITY |
- PCI_STATUS_DETECTED_PARITY));
- if (error_bits) {
- pci_write_config_word(pdev, PCI_STATUS, error_bits);
- printk("PCI%d(PBM%c): Device [%s] saw Parity Error [%016x]n",
- p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
- pdev->name, status);
- }
- }
- walk = &pbus->children;
- for (walk = walk->next; walk != &pbus->children; walk = walk->next)
- pci_scan_for_parity_error(p, pbm, pci_bus_b(walk));
- }