arch/sparc/prom/ranges.c

   1 /*
   2  * ranges.c: Handle ranges in newer proms for obio/sbus.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #include <linux/init.h>
   9 #include <asm/openprom.h>
  10 #include <asm/oplib.h>
  11 #include <asm/types.h>
  12 #include <asm/system.h>
  13
  14 struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
  15 int num_obio_ranges;
  16
  17 /* Adjust register values based upon the ranges parameters. */
  18 static void
  19 prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
  20                  struct linux_prom_ranges *rangep, int nranges)
  21 {
  22         int regc, rngc;
  23
  24         for (regc = 0; regc < nregs; regc++) {
  25                 for (rngc = 0; rngc < nranges; rngc++)
  26                         if (regp[regc].which_io == rangep[rngc].ot_child_space)
  27                                 break; /* Fount it */
  28                 if (rngc == nranges) /* oops */
  29                         prom_printf("adjust_regs: Could not find range with matching bus type...\n");
  30                 regp[regc].which_io = rangep[rngc].ot_parent_space;
  31                 regp[regc].phys_addr -= rangep[rngc].ot_child_base;
  32                 regp[regc].phys_addr += rangep[rngc].ot_parent_base;
  33         }
  34 }
  35
  36 void
  37 prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1,
  38                    struct linux_prom_ranges *ranges2, int nranges2)
  39 {
  40         int rng1c, rng2c;
  41
  42         for(rng1c=0; rng1c < nranges1; rng1c++) {
  43                 for(rng2c=0; rng2c < nranges2; rng2c++)
  44                         if(ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space &&
  45                            ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base &&
  46                            ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U)
  47                         break;
  48                 if(rng2c == nranges2) /* oops */
  49                         prom_printf("adjust_ranges: Could not find matching bus type...\n");
  50                 else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size)
  51                         ranges1[rng1c].or_size =
  52                                 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base;
  53                 ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space;
  54                 ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base;
  55         }
  56 }
  57
  58 /* Apply probed obio ranges to registers passed, if no ranges return. */
  59 void
  60 prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
  61 {
  62         if(num_obio_ranges)
  63                 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
  64 }
  65
  66 void __init prom_ranges_init(void)
  67 {
  68         int node, obio_node;
  69         int success;
  70
  71         num_obio_ranges = 0;
  72
  73         /* Check for obio and sbus ranges. */
  74         node = prom_getchild(prom_root_node);
  75         obio_node = prom_searchsiblings(node, "obio");
  76
  77         if(obio_node) {
  78                 success = prom_getproperty(obio_node, "ranges",
  79                                            (char *) promlib_obio_ranges,
  80                                            sizeof(promlib_obio_ranges));
  81                 if(success != -1)
  82                         num_obio_ranges = (success/sizeof(struct linux_prom_ranges));
  83         }
  84
  85         if(num_obio_ranges)
  86                 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);
  87
  88         return;
  89 }
  90
  91 void
  92 prom_apply_generic_ranges (int node, int parent, struct linux_prom_registers *regs, int nregs)
  93 {
  94         int success;
  95         int num_ranges;
  96         struct linux_prom_ranges ranges[PROMREG_MAX];
  97
  98         success = prom_getproperty(node, "ranges",
  99                                    (char *) ranges,
 100                                    sizeof (ranges));
 101         if (success != -1) {
 102                 num_ranges = (success/sizeof(struct linux_prom_ranges));
 103                 if (parent) {
 104                         struct linux_prom_ranges parent_ranges[PROMREG_MAX];
 105                         int num_parent_ranges;
 106
 107                         success = prom_getproperty(parent, "ranges",
 108                                                    (char *) parent_ranges,
 109                                                    sizeof (parent_ranges));
 110                         if (success != -1) {
 111                                 num_parent_ranges = (success/sizeof(struct linux_prom_ranges));
 112                                 prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges);
 113                         }
 114                 }
 115                 prom_adjust_regs(regs, nregs, ranges, num_ranges);
 116         }
 117 }