// SPDX-License-Identifier: GPL-2.0
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/*
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* ranges.c: Handle ranges in newer proms for obio/sbus.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/types.h>
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static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
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static int num_obio_ranges;
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/* Adjust register values based upon the ranges parameters. */
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static void prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
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struct linux_prom_ranges *rangep, int nranges)
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{
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int regc, rngc;
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for (regc = 0; regc < nregs; regc++) {
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for (rngc = 0; rngc < nranges; rngc++)
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if (regp[regc].which_io == rangep[rngc].ot_child_space)
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break; /* Fount it */
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if (rngc == nranges) /* oops */
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prom_printf("adjust_regs: Could not find range with matching bus type...\n");
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regp[regc].which_io = rangep[rngc].ot_parent_space;
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regp[regc].phys_addr -= rangep[rngc].ot_child_base;
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regp[regc].phys_addr += rangep[rngc].ot_parent_base;
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}
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}
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static void prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1,
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struct linux_prom_ranges *ranges2, int nranges2)
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{
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int rng1c, rng2c;
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for (rng1c = 0; rng1c < nranges1; rng1c++) {
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for (rng2c = 0; rng2c < nranges2; rng2c++)
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if (ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space &&
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ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base &&
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ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U)
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break;
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if (rng2c == nranges2) /* oops */
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prom_printf("adjust_ranges: Could not find matching bus type...\n");
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else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size)
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ranges1[rng1c].or_size = ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base;
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ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space;
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ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base;
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}
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}
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/* Apply probed obio ranges to registers passed, if no ranges return. */
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void prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
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{
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if (num_obio_ranges)
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prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
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}
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EXPORT_SYMBOL(prom_apply_obio_ranges);
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void __init prom_ranges_init(void)
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{
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phandle node, obio_node;
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int success;
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num_obio_ranges = 0;
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/* Check for obio and sbus ranges. */
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node = prom_getchild(prom_root_node);
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obio_node = prom_searchsiblings(node, "obio");
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if (obio_node) {
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success = prom_getproperty(obio_node, "ranges",
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(char *) promlib_obio_ranges,
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sizeof(promlib_obio_ranges));
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if (success != -1)
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num_obio_ranges = (success / sizeof(struct linux_prom_ranges));
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}
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if (num_obio_ranges)
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prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);
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}
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void prom_apply_generic_ranges(phandle node, phandle parent,
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struct linux_prom_registers *regs, int nregs)
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{
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int success;
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int num_ranges;
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struct linux_prom_ranges ranges[PROMREG_MAX];
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success = prom_getproperty(node, "ranges",
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(char *) ranges,
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sizeof(ranges));
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if (success != -1) {
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num_ranges = (success / sizeof(struct linux_prom_ranges));
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if (parent) {
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struct linux_prom_ranges parent_ranges[PROMREG_MAX];
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int num_parent_ranges;
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success = prom_getproperty(parent, "ranges",
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(char *) parent_ranges,
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sizeof(parent_ranges));
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if (success != -1) {
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num_parent_ranges = (success / sizeof(struct linux_prom_ranges));
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prom_adjust_ranges(ranges, num_ranges, parent_ranges, num_parent_ranges);
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}
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}
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prom_adjust_regs(regs, nregs, ranges, num_ranges);
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}
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}
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