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of_device.c

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

static int node_match(struct device *dev, void *data)
{
      struct of_device *op = to_of_device(dev);
      struct device_node *dp = data;

      return (op->node == dp);
}

struct of_device *of_find_device_by_node(struct device_node *dp)
{
      struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
                                   dp, node_match);

      if (dev)
            return to_of_device(dev);

      return NULL;
}
EXPORT_SYMBOL(of_find_device_by_node);

#ifdef CONFIG_PCI
struct bus_type ebus_bus_type;
EXPORT_SYMBOL(ebus_bus_type);
#endif

#ifdef CONFIG_SBUS
struct bus_type sbus_bus_type;
EXPORT_SYMBOL(sbus_bus_type);
#endif

struct bus_type of_platform_bus_type;
EXPORT_SYMBOL(of_platform_bus_type);

static inline u64 of_read_addr(const u32 *cell, int size)
{
      u64 r = 0;
      while (size--)
            r = (r << 32) | *(cell++);
      return r;
}

static void __init get_cells(struct device_node *dp,
                       int *addrc, int *sizec)
{
      if (addrc)
            *addrc = of_n_addr_cells(dp);
      if (sizec)
            *sizec = of_n_size_cells(dp);
}

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS     4

struct of_bus {
      const char  *name;
      const char  *addr_prop_name;
      int         (*match)(struct device_node *parent);
      void        (*count_cells)(struct device_node *child,
                               int *addrc, int *sizec);
      int         (*map)(u32 *addr, const u32 *range,
                         int na, int ns, int pna);
      unsigned long     (*get_flags)(const u32 *addr, unsigned long);
};

/*
 * Default translator (generic bus)
 */

static void of_bus_default_count_cells(struct device_node *dev,
                               int *addrc, int *sizec)
{
      get_cells(dev, addrc, sizec);
}

/* Make sure the least significant 64-bits are in-range.  Even
 * for 3 or 4 cell values it is a good enough approximation.
 */
static int of_out_of_range(const u32 *addr, const u32 *base,
                     const u32 *size, int na, int ns)
{
      u64 a = of_read_addr(addr, na);
      u64 b = of_read_addr(base, na);

      if (a < b)
            return 1;

      b += of_read_addr(size, ns);
      if (a >= b)
            return 1;

      return 0;
}

static int of_bus_default_map(u32 *addr, const u32 *range,
                        int na, int ns, int pna)
{
      u32 result[OF_MAX_ADDR_CELLS];
      int i;

      if (ns > 2) {
            printk("of_device: Cannot handle size cells (%d) > 2.", ns);
            return -EINVAL;
      }

      if (of_out_of_range(addr, range, range + na + pna, na, ns))
            return -EINVAL;

      /* Start with the parent range base.  */
      memcpy(result, range + na, pna * 4);

      /* Add in the child address offset.  */
      for (i = 0; i < na; i++)
            result[pna - 1 - i] +=
                  (addr[na - 1 - i] -
                   range[na - 1 - i]);

      memcpy(addr, result, pna * 4);

      return 0;
}

static unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
{
      if (flags)
            return flags;
      return IORESOURCE_MEM;
}

/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
      if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
            /* Do not do PCI specific frobbing if the
             * PCI bridge lacks a ranges property.  We
             * want to pass it through up to the next
             * parent as-is, not with the PCI translate
             * method which chops off the top address cell.
             */
            if (!of_find_property(np, "ranges", NULL))
                  return 0;

            return 1;
      }

      return 0;
}

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

static int of_bus_pci_map(u32 *addr, const u32 *range,
                    int na, int ns, int pna)
{
      u32 result[OF_MAX_ADDR_CELLS];
      int i;

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

      if (of_out_of_range(addr + 1, range + 1, range + na + pna,
                      na - 1, ns))
            return -EINVAL;

      /* Start with the parent range base.  */
      memcpy(result, range + na, pna * 4);

      /* Add in the child address offset, skipping high cell.  */
      for (i = 0; i < na - 1; i++)
            result[pna - 1 - i] +=
                  (addr[na - 1 - i] -
                   range[na - 1 - i]);

      memcpy(addr, result, pna * 4);

      return 0;
}

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

      /* For PCI, we override whatever child busses may have used.  */
      flags = 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;
}

/*
 * SBUS bus specific translator
 */

static int of_bus_sbus_match(struct device_node *np)
{
      return !strcmp(np->name, "sbus") ||
            !strcmp(np->name, "sbi");
}

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

static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
{
      return of_bus_default_map(addr, range, na, ns, pna);
}

static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
{
      return IORESOURCE_MEM;
}


/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
      /* PCI */
      {
            .name = "pci",
            .addr_prop_name = "assigned-addresses",
            .match = of_bus_pci_match,
            .count_cells = of_bus_pci_count_cells,
            .map = of_bus_pci_map,
            .get_flags = of_bus_pci_get_flags,
      },
      /* SBUS */
      {
            .name = "sbus",
            .addr_prop_name = "reg",
            .match = of_bus_sbus_match,
            .count_cells = of_bus_sbus_count_cells,
            .map = of_bus_sbus_map,
            .get_flags = of_bus_sbus_get_flags,
      },
      /* Default */
      {
            .name = "default",
            .addr_prop_name = "reg",
            .match = NULL,
            .count_cells = of_bus_default_count_cells,
            .map = of_bus_default_map,
            .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 __init build_one_resource(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;

      ranges = of_get_property(parent, "ranges", &rlen);
      if (ranges == NULL || rlen == 0) {
            u32 result[OF_MAX_ADDR_CELLS];
            int i;

            memset(result, 0, pna * 4);
            for (i = 0; i < na; i++)
                  result[pna - 1 - i] =
                        addr[na - 1 - i];

            memcpy(addr, result, pna * 4);
            return 0;
      }

      /* Now walk through the ranges */
      rlen /= 4;
      rone = na + pna + ns;
      for (; rlen >= rone; rlen -= rone, ranges += rone) {
            if (!bus->map(addr, ranges, na, ns, pna))
                  return 0;
      }

      return 1;
}

static int of_resource_verbose;

static void __init build_device_resources(struct of_device *op,
                                struct device *parent)
{
      struct of_device *p_op;
      struct of_bus *bus;
      int na, ns;
      int index, num_reg;
      const void *preg;

      if (!parent)
            return;

      p_op = to_of_device(parent);
      bus = of_match_bus(p_op->node);
      bus->count_cells(op->node, &na, &ns);

      preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
      if (!preg || num_reg == 0)
            return;

      /* Convert to num-cells.  */
      num_reg /= 4;

      /* Conver to num-entries.  */
      num_reg /= na + ns;

      for (index = 0; index < num_reg; index++) {
            struct resource *r = &op->resource[index];
            u32 addr[OF_MAX_ADDR_CELLS];
            const u32 *reg = (preg + (index * ((na + ns) * 4)));
            struct device_node *dp = op->node;
            struct device_node *pp = p_op->node;
            struct of_bus *pbus, *dbus;
            u64 size, result = OF_BAD_ADDR;
            unsigned long flags;
            int dna, dns;
            int pna, pns;

            size = of_read_addr(reg + na, ns);

            memcpy(addr, reg, na * 4);

            flags = bus->get_flags(reg, 0);

            /* If the immediate parent has no ranges property to apply,
             * just use a 1<->1 mapping.
             */
            if (of_find_property(pp, "ranges", NULL) == NULL) {
                  result = of_read_addr(addr, na);
                  goto build_res;
            }

            dna = na;
            dns = ns;
            dbus = bus;

            while (1) {
                  dp = pp;
                  pp = dp->parent;
                  if (!pp) {
                        result = of_read_addr(addr, dna);
                        break;
                  }

                  pbus = of_match_bus(pp);
                  pbus->count_cells(dp, &pna, &pns);

                  if (build_one_resource(dp, dbus, pbus, addr,
                                     dna, dns, pna))
                        break;

                  flags = pbus->get_flags(addr, flags);

                  dna = pna;
                  dns = pns;
                  dbus = pbus;
            }

      build_res:
            memset(r, 0, sizeof(*r));

            if (of_resource_verbose)
                  printk("%s reg[%d] -> %llx\n",
                         op->node->full_name, index,
                         result);

            if (result != OF_BAD_ADDR) {
                  r->start = result & 0xffffffff;
                  r->end = result + size - 1;
                  r->flags = flags | ((result >> 32ULL) & 0xffUL);
            }
            r->name = op->node->name;
      }
}

static struct of_device * __init scan_one_device(struct device_node *dp,
                                     struct device *parent)
{
      struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
      const struct linux_prom_irqs *intr;
      struct dev_archdata *sd;
      int len, i;

      if (!op)
            return NULL;

      sd = &op->dev.archdata;
      sd->prom_node = dp;
      sd->op = op;

      op->node = dp;

      op->clock_freq = of_getintprop_default(dp, "clock-frequency",
                                     (25*1000*1000));
      op->portid = of_getintprop_default(dp, "upa-portid", -1);
      if (op->portid == -1)
            op->portid = of_getintprop_default(dp, "portid", -1);

      intr = of_get_property(dp, "intr", &len);
      if (intr) {
            op->num_irqs = len / sizeof(struct linux_prom_irqs);
            for (i = 0; i < op->num_irqs; i++)
                  op->irqs[i] = intr[i].pri;
      } else {
            const unsigned int *irq =
                  of_get_property(dp, "interrupts", &len);

            if (irq) {
                  op->num_irqs = len / sizeof(unsigned int);
                  for (i = 0; i < op->num_irqs; i++)
                        op->irqs[i] = irq[i];
            } else {
                  op->num_irqs = 0;
            }
      }
      if (sparc_cpu_model == sun4d) {
            static int pil_to_sbus[] = {
                  0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
            };
            struct device_node *io_unit, *sbi = dp->parent;
            const struct linux_prom_registers *regs;
            int board, slot;

            while (sbi) {
                  if (!strcmp(sbi->name, "sbi"))
                        break;

                  sbi = sbi->parent;
            }
            if (!sbi)
                  goto build_resources;

            regs = of_get_property(dp, "reg", NULL);
            if (!regs)
                  goto build_resources;

            slot = regs->which_io;

            /* If SBI's parent is not io-unit or the io-unit lacks
             * a "board#" property, something is very wrong.
             */
            if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
                  printk("%s: Error, parent is not io-unit.\n",
                         sbi->full_name);
                  goto build_resources;
            }
            io_unit = sbi->parent;
            board = of_getintprop_default(io_unit, "board#", -1);
            if (board == -1) {
                  printk("%s: Error, lacks board# property.\n",
                         io_unit->full_name);
                  goto build_resources;
            }

            for (i = 0; i < op->num_irqs; i++) {
                  int this_irq = op->irqs[i];
                  int sbusl = pil_to_sbus[this_irq];

                  if (sbusl)
                        this_irq = (((board + 1) << 5) +
                                  (sbusl << 2) +
                                  slot);

                  op->irqs[i] = this_irq;
            }
      }

build_resources:
      build_device_resources(op, parent);

      op->dev.parent = parent;
      op->dev.bus = &of_platform_bus_type;
      if (!parent)
            strcpy(op->dev.bus_id, "root");
      else
            sprintf(op->dev.bus_id, "%08x", dp->node);

      if (of_device_register(op)) {
            printk("%s: Could not register of device.\n",
                   dp->full_name);
            kfree(op);
            op = NULL;
      }

      return op;
}

static void __init scan_tree(struct device_node *dp, struct device *parent)
{
      while (dp) {
            struct of_device *op = scan_one_device(dp, parent);

            if (op)
                  scan_tree(dp->child, &op->dev);

            dp = dp->sibling;
      }
}

static void __init scan_of_devices(void)
{
      struct device_node *root = of_find_node_by_path("/");
      struct of_device *parent;

      parent = scan_one_device(root, NULL);
      if (!parent)
            return;

      scan_tree(root->child, &parent->dev);
}

static int __init of_bus_driver_init(void)
{
      int err;

      err = of_bus_type_init(&of_platform_bus_type, "of");
#ifdef CONFIG_PCI
      if (!err)
            err = of_bus_type_init(&ebus_bus_type, "ebus");
#endif
#ifdef CONFIG_SBUS
      if (!err)
            err = of_bus_type_init(&sbus_bus_type, "sbus");
#endif

      if (!err)
            scan_of_devices();

      return err;
}

postcore_initcall(of_bus_driver_init);

static int __init of_debug(char *str)
{
      int val = 0;

      get_option(&str, &val);
      if (val & 1)
            of_resource_verbose = 1;
      return 1;
}

__setup("of_debug=", of_debug);

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