LXR linux/arch/sparc/prom/ranges.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * ranges.c: Handle ranges in newer proms for obio/sbus.
   4 *
   5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7 */
   8
   9#include <linux/init.h>
  10#include <linux/module.h>
  11
  12#include <asm/openprom.h>
  13#include <asm/oplib.h>
  14#include <asm/types.h>
  15
  16static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
  17static int num_obio_ranges;
  18
  19/* Adjust register values based upon the ranges parameters. */
  20static void prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
  21                             struct linux_prom_ranges *rangep, int nranges)
  22{
  23        int regc, rngc;
  24
  25        for (regc = 0; regc < nregs; regc++) {
  26                for (rngc = 0; rngc < nranges; rngc++)
  27                        if (regp[regc].which_io == rangep[rngc].ot_child_space)
  28                                break; /* Fount it */
  29                if (rngc == nranges) /* oops */
  30                        prom_printf("adjust_regs: Could not find range with matching bus type...\n");
  31                regp[regc].which_io = rangep[rngc].ot_parent_space;
  32                regp[regc].phys_addr -= rangep[rngc].ot_child_base;
  33                regp[regc].phys_addr += rangep[rngc].ot_parent_base;
  34        }
  35}
  36
  37static void 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 = ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base;
  52                ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space;
  53                ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base;
  54        }
  55}
  56
  57/* Apply probed obio ranges to registers passed, if no ranges return. */
  58void prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
  59{
  60        if (num_obio_ranges)
  61                prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
  62}
  63EXPORT_SYMBOL(prom_apply_obio_ranges);
  64
  65void __init prom_ranges_init(void)
  66{
  67        phandle node, obio_node;
  68        int success;
  69
  70        num_obio_ranges = 0;
  71
  72        /* Check for obio and sbus ranges. */
  73        node = prom_getchild(prom_root_node);
  74        obio_node = prom_searchsiblings(node, "obio");
  75
  76        if (obio_node) {
  77                success = prom_getproperty(obio_node, "ranges",
  78                                           (char *) promlib_obio_ranges,
  79                                           sizeof(promlib_obio_ranges));
  80                if (success != -1)
  81                        num_obio_ranges = (success / sizeof(struct linux_prom_ranges));
  82        }
  83
  84        if (num_obio_ranges)
  85                prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);
  86}
  87
  88void prom_apply_generic_ranges(phandle node, phandle parent,
  89                               struct linux_prom_registers *regs, int nregs)
  90{
  91        int success;
  92        int num_ranges;
  93        struct linux_prom_ranges ranges[PROMREG_MAX];
  94
  95        success = prom_getproperty(node, "ranges",
  96                                   (char *) ranges,
  97                                   sizeof(ranges));
  98        if (success != -1) {
  99                num_ranges = (success / sizeof(struct linux_prom_ranges));
 100                if (parent) {
 101                        struct linux_prom_ranges parent_ranges[PROMREG_MAX];
 102                        int num_parent_ranges;
 103
 104                        success = prom_getproperty(parent, "ranges",
 105                                                   (char *) parent_ranges,
 106                                                   sizeof(parent_ranges));
 107                        if (success != -1) {
 108                                num_parent_ranges = (success / sizeof(struct linux_prom_ranges));
 109                                prom_adjust_ranges(ranges, num_ranges, parent_ranges, num_parent_ranges);
 110                        }
 111                }
 112                prom_adjust_regs(regs, nregs, ranges, num_ranges);
 113        }
 114}
 115