ranges.c

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/*
 * ranges.c: Handle ranges in newer proms for obio/sbus.
 *
 * Copyright (C) 1995 David S. Miller ([email protected])
 * Copyright (C) 1997 Jakub Jelinek ([email protected])
 */

#include <linux/init.h>
#include <linux/module.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/types.h>

static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
static 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;
    }
}

static 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);
}
EXPORT_SYMBOL(prom_apply_obio_ranges);

void __init prom_ranges_init(void)
{
    phandle 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);
}

void prom_apply_generic_ranges(phandle node, phandle 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);
    }
}