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ranges.c

/*
 * ranges.c: Handle ranges in newer proms for obio/sbus.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/init.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/types.h>
#include <asm/sbus.h>
#include <asm/system.h>

struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
int num_obio_ranges;

/* Adjust register values based upon the ranges parameters. */
static void
prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
             struct linux_prom_ranges *rangep, int nranges)
{
      int regc, rngc;

      for (regc = 0; regc < nregs; regc++) {
            for (rngc = 0; rngc < nranges; rngc++)
                  if (regp[regc].which_io == rangep[rngc].ot_child_space)
                        break; /* Fount it */
            if (rngc == nranges) /* oops */
                  prom_printf("adjust_regs: Could not find range with matching bus type...\n");
            regp[regc].which_io = rangep[rngc].ot_parent_space;
            regp[regc].phys_addr -= rangep[rngc].ot_child_base;
            regp[regc].phys_addr += rangep[rngc].ot_parent_base;
      }
}

void
prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1,
               struct linux_prom_ranges *ranges2, int nranges2)
{
      int rng1c, rng2c;

      for(rng1c=0; rng1c < nranges1; rng1c++) {
            for(rng2c=0; rng2c < nranges2; rng2c++)
                  if(ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space &&
                     ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base &&
                     ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U)
                  break;
            if(rng2c == nranges2) /* oops */
                  prom_printf("adjust_ranges: Could not find matching bus type...\n");
            else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size)
                  ranges1[rng1c].or_size =
                        ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base;
            ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space;
            ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base;
      }
}

/* Apply probed obio ranges to registers passed, if no ranges return. */
void
prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
{
      if(num_obio_ranges)
            prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
}

void __init prom_ranges_init(void)
{
      int node, obio_node;
      int success;

      num_obio_ranges = 0;

      /* Check for obio and sbus ranges. */
      node = prom_getchild(prom_root_node);
      obio_node = prom_searchsiblings(node, "obio");

      if(obio_node) {
            success = prom_getproperty(obio_node, "ranges",
                                 (char *) promlib_obio_ranges,
                                 sizeof(promlib_obio_ranges));
            if(success != -1)
                  num_obio_ranges = (success/sizeof(struct linux_prom_ranges));
      }

      if(num_obio_ranges)
            prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);

      return;
}

void
prom_apply_generic_ranges (int node, int parent, struct linux_prom_registers *regs, int nregs)
{
      int success;
      int num_ranges;
      struct linux_prom_ranges ranges[PROMREG_MAX];
      
      success = prom_getproperty(node, "ranges",
                           (char *) ranges,
                           sizeof (ranges));
      if (success != -1) {
            num_ranges = (success/sizeof(struct linux_prom_ranges));
            if (parent) {
                  struct linux_prom_ranges parent_ranges[PROMREG_MAX];
                  int num_parent_ranges;
            
                  success = prom_getproperty(parent, "ranges",
                                       (char *) parent_ranges,
                                       sizeof (parent_ranges));
                  if (success != -1) {
                        num_parent_ranges = (success/sizeof(struct linux_prom_ranges));
                        prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges);
                  }
            }
            prom_adjust_regs(regs, nregs, ranges, num_ranges);
      }
}

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