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prom_parse.c

#undef DEBUG

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/pci_regs.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/etherdevice.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>

#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

#ifdef CONFIG_PPC64
#define PRu64     "%lx"
#else
#define PRu64     "%llx"
#endif

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS     4
#define OF_CHECK_COUNTS(na, ns)     ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
                  (ns) > 0)

static struct of_bus *of_match_bus(struct device_node *np);
static int __of_address_to_resource(struct device_node *dev,
            const u32 *addrp, u64 size, unsigned int flags,
            struct resource *r);


/* Debug utility */
#ifdef DEBUG
static void of_dump_addr(const char *s, const u32 *addr, int na)
{
      printk("%s", s);
      while(na--)
            printk(" %08x", *(addr++));
      printk("\n");
}
#else
static void of_dump_addr(const char *s, const u32 *addr, int na) { }
#endif


/* Callbacks for bus specific translators */
struct of_bus {
      const char  *name;
      const char  *addresses;
      int         (*match)(struct device_node *parent);
      void        (*count_cells)(struct device_node *child,
                               int *addrc, int *sizec);
      u64         (*map)(u32 *addr, const u32 *range,
                        int na, int ns, int pna);
      int         (*translate)(u32 *addr, u64 offset, int na);
      unsigned int      (*get_flags)(const u32 *addr);
};


/*
 * Default translator (generic bus)
 */

static void of_bus_default_count_cells(struct device_node *dev,
                               int *addrc, int *sizec)
{
      if (addrc)
            *addrc = of_n_addr_cells(dev);
      if (sizec)
            *sizec = of_n_size_cells(dev);
}

static u64 of_bus_default_map(u32 *addr, const u32 *range,
            int na, int ns, int pna)
{
      u64 cp, s, da;

      cp = of_read_number(range, na);
      s  = of_read_number(range + na + pna, ns);
      da = of_read_number(addr, na);

      DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
          cp, s, da);

      if (da < cp || da >= (cp + s))
            return OF_BAD_ADDR;
      return da - cp;
}

static int of_bus_default_translate(u32 *addr, u64 offset, int na)
{
      u64 a = of_read_number(addr, na);
      memset(addr, 0, na * 4);
      a += offset;
      if (na > 1)
            addr[na - 2] = a >> 32;
      addr[na - 1] = a & 0xffffffffu;

      return 0;
}

static unsigned int of_bus_default_get_flags(const u32 *addr)
{
      return IORESOURCE_MEM;
}


#ifdef CONFIG_PCI
/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
      /* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
      return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
}

static void of_bus_pci_count_cells(struct device_node *np,
                           int *addrc, int *sizec)
{
      if (addrc)
            *addrc = 3;
      if (sizec)
            *sizec = 2;
}

static u64 of_bus_pci_map(u32 *addr, const u32 *range, int na, int ns, int pna)
{
      u64 cp, s, da;

      /* Check address type match */
      if ((addr[0] ^ range[0]) & 0x03000000)
            return OF_BAD_ADDR;

      /* Read address values, skipping high cell */
      cp = of_read_number(range + 1, na - 1);
      s  = of_read_number(range + na + pna, ns);
      da = of_read_number(addr + 1, na - 1);

      DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);

      if (da < cp || da >= (cp + s))
            return OF_BAD_ADDR;
      return da - cp;
}

static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
{
      return of_bus_default_translate(addr + 1, offset, na - 1);
}

static unsigned int of_bus_pci_get_flags(const u32 *addr)
{
      unsigned int flags = 0;
      u32 w = addr[0];

      switch((w >> 24) & 0x03) {
      case 0x01:
            flags |= IORESOURCE_IO;
            break;
      case 0x02: /* 32 bits */
      case 0x03: /* 64 bits */
            flags |= IORESOURCE_MEM;
            break;
      }
      if (w & 0x40000000)
            flags |= IORESOURCE_PREFETCH;
      return flags;
}

const u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
                  unsigned int *flags)
{
      const u32 *prop;
      unsigned int psize;
      struct device_node *parent;
      struct of_bus *bus;
      int onesize, i, na, ns;

      /* Get parent & match bus type */
      parent = of_get_parent(dev);
      if (parent == NULL)
            return NULL;
      bus = of_match_bus(parent);
      if (strcmp(bus->name, "pci")) {
            of_node_put(parent);
            return NULL;
      }
      bus->count_cells(dev, &na, &ns);
      of_node_put(parent);
      if (!OF_CHECK_COUNTS(na, ns))
            return NULL;

      /* Get "reg" or "assigned-addresses" property */
      prop = of_get_property(dev, bus->addresses, &psize);
      if (prop == NULL)
            return NULL;
      psize /= 4;

      onesize = na + ns;
      for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
            if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
                  if (size)
                        *size = of_read_number(prop + na, ns);
                  if (flags)
                        *flags = bus->get_flags(prop);
                  return prop;
            }
      return NULL;
}
EXPORT_SYMBOL(of_get_pci_address);

int of_pci_address_to_resource(struct device_node *dev, int bar,
                         struct resource *r)
{
      const u32   *addrp;
      u64         size;
      unsigned int      flags;

      addrp = of_get_pci_address(dev, bar, &size, &flags);
      if (addrp == NULL)
            return -EINVAL;
      return __of_address_to_resource(dev, addrp, size, flags, r);
}
EXPORT_SYMBOL_GPL(of_pci_address_to_resource);

static u8 of_irq_pci_swizzle(u8 slot, u8 pin)
{
      return (((pin - 1) + slot) % 4) + 1;
}

int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
{
      struct device_node *dn, *ppnode;
      struct pci_dev *ppdev;
      u32 lspec;
      u32 laddr[3];
      u8 pin;
      int rc;

      /* Check if we have a device node, if yes, fallback to standard OF
       * parsing
       */
      dn = pci_device_to_OF_node(pdev);
      if (dn)
            return of_irq_map_one(dn, 0, out_irq);

      /* Ok, we don't, time to have fun. Let's start by building up an
       * interrupt spec.  we assume #interrupt-cells is 1, which is standard
       * for PCI. If you do different, then don't use that routine.
       */
      rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
      if (rc != 0)
            return rc;
      /* No pin, exit */
      if (pin == 0)
            return -ENODEV;

      /* Now we walk up the PCI tree */
      lspec = pin;
      for (;;) {
            /* Get the pci_dev of our parent */
            ppdev = pdev->bus->self;

            /* Ouch, it's a host bridge... */
            if (ppdev == NULL) {
#ifdef CONFIG_PPC64
                  ppnode = pci_bus_to_OF_node(pdev->bus);
#else
                  struct pci_controller *host;
                  host = pci_bus_to_host(pdev->bus);
                  ppnode = host ? host->arch_data : NULL;
#endif
                  /* No node for host bridge ? give up */
                  if (ppnode == NULL)
                        return -EINVAL;
            } else
                  /* We found a P2P bridge, check if it has a node */
                  ppnode = pci_device_to_OF_node(ppdev);

            /* Ok, we have found a parent with a device-node, hand over to
             * the OF parsing code.
             * We build a unit address from the linux device to be used for
             * resolution. Note that we use the linux bus number which may
             * not match your firmware bus numbering.
             * Fortunately, in most cases, interrupt-map-mask doesn't include
             * the bus number as part of the matching.
             * You should still be careful about that though if you intend
             * to rely on this function (you ship  a firmware that doesn't
             * create device nodes for all PCI devices).
             */
            if (ppnode)
                  break;

            /* We can only get here if we hit a P2P bridge with no node,
             * let's do standard swizzling and try again
             */
            lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec);
            pdev = ppdev;
      }

      laddr[0] = (pdev->bus->number << 16)
            | (pdev->devfn << 8);
      laddr[1]  = laddr[2] = 0;
      return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
}
EXPORT_SYMBOL_GPL(of_irq_map_pci);
#endif /* CONFIG_PCI */

/*
 * ISA bus specific translator
 */

static int of_bus_isa_match(struct device_node *np)
{
      return !strcmp(np->name, "isa");
}

static void of_bus_isa_count_cells(struct device_node *child,
                           int *addrc, int *sizec)
{
      if (addrc)
            *addrc = 2;
      if (sizec)
            *sizec = 1;
}

static u64 of_bus_isa_map(u32 *addr, const u32 *range, int na, int ns, int pna)
{
      u64 cp, s, da;

      /* Check address type match */
      if ((addr[0] ^ range[0]) & 0x00000001)
            return OF_BAD_ADDR;

      /* Read address values, skipping high cell */
      cp = of_read_number(range + 1, na - 1);
      s  = of_read_number(range + na + pna, ns);
      da = of_read_number(addr + 1, na - 1);

      DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);

      if (da < cp || da >= (cp + s))
            return OF_BAD_ADDR;
      return da - cp;
}

static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
{
      return of_bus_default_translate(addr + 1, offset, na - 1);
}

static unsigned int of_bus_isa_get_flags(const u32 *addr)
{
      unsigned int flags = 0;
      u32 w = addr[0];

      if (w & 1)
            flags |= IORESOURCE_IO;
      else
            flags |= IORESOURCE_MEM;
      return flags;
}


/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
#ifdef CONFIG_PCI
      /* PCI */
      {
            .name = "pci",
            .addresses = "assigned-addresses",
            .match = of_bus_pci_match,
            .count_cells = of_bus_pci_count_cells,
            .map = of_bus_pci_map,
            .translate = of_bus_pci_translate,
            .get_flags = of_bus_pci_get_flags,
      },
#endif /* CONFIG_PCI */
      /* ISA */
      {
            .name = "isa",
            .addresses = "reg",
            .match = of_bus_isa_match,
            .count_cells = of_bus_isa_count_cells,
            .map = of_bus_isa_map,
            .translate = of_bus_isa_translate,
            .get_flags = of_bus_isa_get_flags,
      },
      /* Default */
      {
            .name = "default",
            .addresses = "reg",
            .match = NULL,
            .count_cells = of_bus_default_count_cells,
            .map = of_bus_default_map,
            .translate = of_bus_default_translate,
            .get_flags = of_bus_default_get_flags,
      },
};

static struct of_bus *of_match_bus(struct device_node *np)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
            if (!of_busses[i].match || of_busses[i].match(np))
                  return &of_busses[i];
      BUG();
      return NULL;
}

static int of_translate_one(struct device_node *parent, struct of_bus *bus,
                      struct of_bus *pbus, u32 *addr,
                      int na, int ns, int pna)
{
      const u32 *ranges;
      unsigned int rlen;
      int rone;
      u64 offset = OF_BAD_ADDR;

      /* Normally, an absence of a "ranges" property means we are
       * crossing a non-translatable boundary, and thus the addresses
       * below the current not cannot be converted to CPU physical ones.
       * Unfortunately, while this is very clear in the spec, it's not
       * what Apple understood, and they do have things like /uni-n or
       * /ht nodes with no "ranges" property and a lot of perfectly
       * useable mapped devices below them. Thus we treat the absence of
       * "ranges" as equivalent to an empty "ranges" property which means
       * a 1:1 translation at that level. It's up to the caller not to try
       * to translate addresses that aren't supposed to be translated in
       * the first place. --BenH.
       */
      ranges = of_get_property(parent, "ranges", &rlen);
      if (ranges == NULL || rlen == 0) {
            offset = of_read_number(addr, na);
            memset(addr, 0, pna * 4);
            DBG("OF: no ranges, 1:1 translation\n");
            goto finish;
      }

      DBG("OF: walking ranges...\n");

      /* Now walk through the ranges */
      rlen /= 4;
      rone = na + pna + ns;
      for (; rlen >= rone; rlen -= rone, ranges += rone) {
            offset = bus->map(addr, ranges, na, ns, pna);
            if (offset != OF_BAD_ADDR)
                  break;
      }
      if (offset == OF_BAD_ADDR) {
            DBG("OF: not found !\n");
            return 1;
      }
      memcpy(addr, ranges + na, 4 * pna);

 finish:
      of_dump_addr("OF: parent translation for:", addr, pna);
      DBG("OF: with offset: "PRu64"\n", offset);

      /* Translate it into parent bus space */
      return pbus->translate(addr, offset, pna);
}


/*
 * Translate an address from the device-tree into a CPU physical address,
 * this walks up the tree and applies the various bus mappings on the
 * way.
 *
 * Note: We consider that crossing any level with #size-cells == 0 to mean
 * that translation is impossible (that is we are not dealing with a value
 * that can be mapped to a cpu physical address). This is not really specified
 * that way, but this is traditionally the way IBM at least do things
 */
u64 of_translate_address(struct device_node *dev, const u32 *in_addr)
{
      struct device_node *parent = NULL;
      struct of_bus *bus, *pbus;
      u32 addr[OF_MAX_ADDR_CELLS];
      int na, ns, pna, pns;
      u64 result = OF_BAD_ADDR;

      DBG("OF: ** translation for device %s **\n", dev->full_name);

      /* Increase refcount at current level */
      of_node_get(dev);

      /* Get parent & match bus type */
      parent = of_get_parent(dev);
      if (parent == NULL)
            goto bail;
      bus = of_match_bus(parent);

      /* Cound address cells & copy address locally */
      bus->count_cells(dev, &na, &ns);
      if (!OF_CHECK_COUNTS(na, ns)) {
            printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
                   dev->full_name);
            goto bail;
      }
      memcpy(addr, in_addr, na * 4);

      DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
          bus->name, na, ns, parent->full_name);
      of_dump_addr("OF: translating address:", addr, na);

      /* Translate */
      for (;;) {
            /* Switch to parent bus */
            of_node_put(dev);
            dev = parent;
            parent = of_get_parent(dev);

            /* If root, we have finished */
            if (parent == NULL) {
                  DBG("OF: reached root node\n");
                  result = of_read_number(addr, na);
                  break;
            }

            /* Get new parent bus and counts */
            pbus = of_match_bus(parent);
            pbus->count_cells(dev, &pna, &pns);
            if (!OF_CHECK_COUNTS(pna, pns)) {
                  printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
                         dev->full_name);
                  break;
            }

            DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
                pbus->name, pna, pns, parent->full_name);

            /* Apply bus translation */
            if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
                  break;

            /* Complete the move up one level */
            na = pna;
            ns = pns;
            bus = pbus;

            of_dump_addr("OF: one level translation:", addr, na);
      }
 bail:
      of_node_put(parent);
      of_node_put(dev);

      return result;
}
EXPORT_SYMBOL(of_translate_address);

const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
                unsigned int *flags)
{
      const u32 *prop;
      unsigned int psize;
      struct device_node *parent;
      struct of_bus *bus;
      int onesize, i, na, ns;

      /* Get parent & match bus type */
      parent = of_get_parent(dev);
      if (parent == NULL)
            return NULL;
      bus = of_match_bus(parent);
      bus->count_cells(dev, &na, &ns);
      of_node_put(parent);
      if (!OF_CHECK_COUNTS(na, ns))
            return NULL;

      /* Get "reg" or "assigned-addresses" property */
      prop = of_get_property(dev, bus->addresses, &psize);
      if (prop == NULL)
            return NULL;
      psize /= 4;

      onesize = na + ns;
      for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
            if (i == index) {
                  if (size)
                        *size = of_read_number(prop + na, ns);
                  if (flags)
                        *flags = bus->get_flags(prop);
                  return prop;
            }
      return NULL;
}
EXPORT_SYMBOL(of_get_address);

static int __of_address_to_resource(struct device_node *dev, const u32 *addrp,
                            u64 size, unsigned int flags,
                            struct resource *r)
{
      u64 taddr;

      if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
            return -EINVAL;
      taddr = of_translate_address(dev, addrp);
      if (taddr == OF_BAD_ADDR)
            return -EINVAL;
      memset(r, 0, sizeof(struct resource));
      if (flags & IORESOURCE_IO) {
            unsigned long port;
            port = pci_address_to_pio(taddr);
            if (port == (unsigned long)-1)
                  return -EINVAL;
            r->start = port;
            r->end = port + size - 1;
      } else {
            r->start = taddr;
            r->end = taddr + size - 1;
      }
      r->flags = flags;
      r->name = dev->name;
      return 0;
}

int of_address_to_resource(struct device_node *dev, int index,
                     struct resource *r)
{
      const u32   *addrp;
      u64         size;
      unsigned int      flags;

      addrp = of_get_address(dev, index, &size, &flags);
      if (addrp == NULL)
            return -EINVAL;
      return __of_address_to_resource(dev, addrp, size, flags, r);
}
EXPORT_SYMBOL_GPL(of_address_to_resource);

void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
            unsigned long *busno, unsigned long *phys, unsigned long *size)
{
      const u32 *dma_window;
      u32 cells;
      const unsigned char *prop;

      dma_window = dma_window_prop;

      /* busno is always one cell */
      *busno = *(dma_window++);

      prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
      if (!prop)
            prop = of_get_property(dn, "#address-cells", NULL);

      cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
      *phys = of_read_number(dma_window, cells);

      dma_window += cells;

      prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
      cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
      *size = of_read_number(dma_window, cells);
}

/*
 * Interrupt remapper
 */

static unsigned int of_irq_workarounds;
static struct device_node *of_irq_dflt_pic;

static struct device_node *of_irq_find_parent(struct device_node *child)
{
      struct device_node *p;
      const phandle *parp;

      if (!of_node_get(child))
            return NULL;

      do {
            parp = of_get_property(child, "interrupt-parent", NULL);
            if (parp == NULL)
                  p = of_get_parent(child);
            else {
                  if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
                        p = of_node_get(of_irq_dflt_pic);
                  else
                        p = of_find_node_by_phandle(*parp);
            }
            of_node_put(child);
            child = p;
      } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);

      return p;
}

/* This doesn't need to be called if you don't have any special workaround
 * flags to pass
 */
void of_irq_map_init(unsigned int flags)
{
      of_irq_workarounds = flags;

      /* OldWorld, don't bother looking at other things */
      if (flags & OF_IMAP_OLDWORLD_MAC)
            return;

      /* If we don't have phandles, let's try to locate a default interrupt
       * controller (happens when booting with BootX). We do a first match
       * here, hopefully, that only ever happens on machines with one
       * controller.
       */
      if (flags & OF_IMAP_NO_PHANDLE) {
            struct device_node *np;

            for(np = NULL; (np = of_find_all_nodes(np)) != NULL;) {
                  if (of_get_property(np, "interrupt-controller", NULL)
                      == NULL)
                        continue;
                  /* Skip /chosen/interrupt-controller */
                  if (strcmp(np->name, "chosen") == 0)
                        continue;
                  /* It seems like at least one person on this planet wants
                   * to use BootX on a machine with an AppleKiwi controller
                   * which happens to pretend to be an interrupt
                   * controller too.
                   */
                  if (strcmp(np->name, "AppleKiwi") == 0)
                        continue;
                  /* I think we found one ! */
                  of_irq_dflt_pic = np;
                  break;
            }
      }

}

int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize,
            const u32 *addr, struct of_irq *out_irq)
{
      struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
      const u32 *tmp, *imap, *imask;
      u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
      int imaplen, match, i;

      DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
          parent->full_name, intspec[0], intspec[1], ointsize);

      ipar = of_node_get(parent);

      /* First get the #interrupt-cells property of the current cursor
       * that tells us how to interpret the passed-in intspec. If there
       * is none, we are nice and just walk up the tree
       */
      do {
            tmp = of_get_property(ipar, "#interrupt-cells", NULL);
            if (tmp != NULL) {
                  intsize = *tmp;
                  break;
            }
            tnode = ipar;
            ipar = of_irq_find_parent(ipar);
            of_node_put(tnode);
      } while (ipar);
      if (ipar == NULL) {
            DBG(" -> no parent found !\n");
            goto fail;
      }

      DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);

      if (ointsize != intsize)
            return -EINVAL;

      /* Look for this #address-cells. We have to implement the old linux
       * trick of looking for the parent here as some device-trees rely on it
       */
      old = of_node_get(ipar);
      do {
            tmp = of_get_property(old, "#address-cells", NULL);
            tnode = of_get_parent(old);
            of_node_put(old);
            old = tnode;
      } while(old && tmp == NULL);
      of_node_put(old);
      old = NULL;
      addrsize = (tmp == NULL) ? 2 : *tmp;

      DBG(" -> addrsize=%d\n", addrsize);

      /* Now start the actual "proper" walk of the interrupt tree */
      while (ipar != NULL) {
            /* Now check if cursor is an interrupt-controller and if it is
             * then we are done
             */
            if (of_get_property(ipar, "interrupt-controller", NULL) !=
                        NULL) {
                  DBG(" -> got it !\n");
                  memcpy(out_irq->specifier, intspec,
                         intsize * sizeof(u32));
                  out_irq->size = intsize;
                  out_irq->controller = ipar;
                  of_node_put(old);
                  return 0;
            }

            /* Now look for an interrupt-map */
            imap = of_get_property(ipar, "interrupt-map", &imaplen);
            /* No interrupt map, check for an interrupt parent */
            if (imap == NULL) {
                  DBG(" -> no map, getting parent\n");
                  newpar = of_irq_find_parent(ipar);
                  goto skiplevel;
            }
            imaplen /= sizeof(u32);

            /* Look for a mask */
            imask = of_get_property(ipar, "interrupt-map-mask", NULL);

            /* If we were passed no "reg" property and we attempt to parse
             * an interrupt-map, then #address-cells must be 0.
             * Fail if it's not.
             */
            if (addr == NULL && addrsize != 0) {
                  DBG(" -> no reg passed in when needed !\n");
                  goto fail;
            }

            /* Parse interrupt-map */
            match = 0;
            while (imaplen > (addrsize + intsize + 1) && !match) {
                  /* Compare specifiers */
                  match = 1;
                  for (i = 0; i < addrsize && match; ++i) {
                        u32 mask = imask ? imask[i] : 0xffffffffu;
                        match = ((addr[i] ^ imap[i]) & mask) == 0;
                  }
                  for (; i < (addrsize + intsize) && match; ++i) {
                        u32 mask = imask ? imask[i] : 0xffffffffu;
                        match =
                           ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
                  }
                  imap += addrsize + intsize;
                  imaplen -= addrsize + intsize;

                  DBG(" -> match=%d (imaplen=%d)\n", match, imaplen);

                  /* Get the interrupt parent */
                  if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
                        newpar = of_node_get(of_irq_dflt_pic);
                  else
                        newpar = of_find_node_by_phandle((phandle)*imap);
                  imap++;
                  --imaplen;

                  /* Check if not found */
                  if (newpar == NULL) {
                        DBG(" -> imap parent not found !\n");
                        goto fail;
                  }

                  /* Get #interrupt-cells and #address-cells of new
                   * parent
                   */
                  tmp = of_get_property(newpar, "#interrupt-cells", NULL);
                  if (tmp == NULL) {
                        DBG(" -> parent lacks #interrupt-cells !\n");
                        goto fail;
                  }
                  newintsize = *tmp;
                  tmp = of_get_property(newpar, "#address-cells", NULL);
                  newaddrsize = (tmp == NULL) ? 0 : *tmp;

                  DBG(" -> newintsize=%d, newaddrsize=%d\n",
                      newintsize, newaddrsize);

                  /* Check for malformed properties */
                  if (imaplen < (newaddrsize + newintsize))
                        goto fail;

                  imap += newaddrsize + newintsize;
                  imaplen -= newaddrsize + newintsize;

                  DBG(" -> imaplen=%d\n", imaplen);
            }
            if (!match)
                  goto fail;

            of_node_put(old);
            old = of_node_get(newpar);
            addrsize = newaddrsize;
            intsize = newintsize;
            intspec = imap - intsize;
            addr = intspec - addrsize;

      skiplevel:
            /* Iterate again with new parent */
            DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
            of_node_put(ipar);
            ipar = newpar;
            newpar = NULL;
      }
 fail:
      of_node_put(ipar);
      of_node_put(old);
      of_node_put(newpar);

      return -EINVAL;
}
EXPORT_SYMBOL_GPL(of_irq_map_raw);

#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
static int of_irq_map_oldworld(struct device_node *device, int index,
                         struct of_irq *out_irq)
{
      const u32 *ints = NULL;
      int intlen;

      /*
       * Old machines just have a list of interrupt numbers
       * and no interrupt-controller nodes. We also have dodgy
       * cases where the APPL,interrupts property is completely
       * missing behind pci-pci bridges and we have to get it
       * from the parent (the bridge itself, as apple just wired
       * everything together on these)
       */
      while (device) {
            ints = of_get_property(device, "AAPL,interrupts", &intlen);
            if (ints != NULL)
                  break;
            device = device->parent;
            if (device && strcmp(device->type, "pci") != 0)
                  break;
      }
      if (ints == NULL)
            return -EINVAL;
      intlen /= sizeof(u32);

      if (index >= intlen)
            return -EINVAL;

      out_irq->controller = NULL;
      out_irq->specifier[0] = ints[index];
      out_irq->size = 1;

      return 0;
}
#else /* defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) */
static int of_irq_map_oldworld(struct device_node *device, int index,
                         struct of_irq *out_irq)
{
      return -EINVAL;
}
#endif /* !(defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)) */

int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
{
      struct device_node *p;
      const u32 *intspec, *tmp, *addr;
      u32 intsize, intlen;
      int res;

      DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);

      /* OldWorld mac stuff is "special", handle out of line */
      if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
            return of_irq_map_oldworld(device, index, out_irq);

      /* Get the interrupts property */
      intspec = of_get_property(device, "interrupts", &intlen);
      if (intspec == NULL)
            return -EINVAL;
      intlen /= sizeof(u32);

      /* Get the reg property (if any) */
      addr = of_get_property(device, "reg", NULL);

      /* Look for the interrupt parent. */
      p = of_irq_find_parent(device);
      if (p == NULL)
            return -EINVAL;

      /* Get size of interrupt specifier */
      tmp = of_get_property(p, "#interrupt-cells", NULL);
      if (tmp == NULL) {
            of_node_put(p);
            return -EINVAL;
      }
      intsize = *tmp;

      DBG(" intsize=%d intlen=%d\n", intsize, intlen);

      /* Check index */
      if ((index + 1) * intsize > intlen)
            return -EINVAL;

      /* Get new specifier and map it */
      res = of_irq_map_raw(p, intspec + index * intsize, intsize,
                       addr, out_irq);
      of_node_put(p);
      return res;
}
EXPORT_SYMBOL_GPL(of_irq_map_one);

/**
 * Search the device tree for the best MAC address to use.  'mac-address' is
 * checked first, because that is supposed to contain to "most recent" MAC
 * address. If that isn't set, then 'local-mac-address' is checked next,
 * because that is the default address.  If that isn't set, then the obsolete
 * 'address' is checked, just in case we're using an old device tree.
 *
 * Note that the 'address' property is supposed to contain a virtual address of
 * the register set, but some DTS files have redefined that property to be the
 * MAC address.
 *
 * All-zero MAC addresses are rejected, because those could be properties that
 * exist in the device tree, but were not set by U-Boot.  For example, the
 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
 * addresses.  Some older U-Boots only initialized 'local-mac-address'.  In
 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
 * but is all zeros.
*/
const void *of_get_mac_address(struct device_node *np)
{
      struct property *pp;

      pp = of_find_property(np, "mac-address", NULL);
      if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
            return pp->value;

      pp = of_find_property(np, "local-mac-address", NULL);
      if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
            return pp->value;

      pp = of_find_property(np, "address", NULL);
      if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
            return pp->value;

      return NULL;
}
EXPORT_SYMBOL(of_get_mac_address);

int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
{
      int irq = irq_of_parse_and_map(dev, index);

      /* Only dereference the resource if both the
       * resource and the irq are valid. */
      if (r && irq != NO_IRQ) {
            r->start = r->end = irq;
            r->flags = IORESOURCE_IRQ;
      }

      return irq;
}
EXPORT_SYMBOL_GPL(of_irq_to_resource);

void __iomem *of_iomap(struct device_node *np, int index)
{
      struct resource res;

      if (of_address_to_resource(np, index, &res))
            return NULL;

      return ioremap(res.start, 1 + res.end - res.start);
}
EXPORT_SYMBOL(of_iomap);

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