114 lines
3.6 KiB
C
114 lines
3.6 KiB
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 <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);
|
||
|
|
}
|
||
|
|
}
|