2 * ranges.c: Handle ranges in newer proms for obio/sbus.
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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>
14 struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
17 /* Adjust register values based upon the ranges parameters. */
19 prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
20 struct linux_prom_ranges *rangep, int nranges)
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)
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;
37 prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1,
38 struct linux_prom_ranges *ranges2, int nranges2)
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)
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;
58 /* Apply probed obio ranges to registers passed, if no ranges return. */
60 prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
63 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
66 void __init prom_ranges_init(void)
73 /* Check for obio and sbus ranges. */
74 node = prom_getchild(prom_root_node);
75 obio_node = prom_searchsiblings(node, "obio");
78 success = prom_getproperty(obio_node, "ranges",
79 (char *) promlib_obio_ranges,
80 sizeof(promlib_obio_ranges));
82 num_obio_ranges = (success/sizeof(struct linux_prom_ranges));
86 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);
92 prom_apply_generic_ranges (int node, int parent, struct linux_prom_registers *regs, int nregs)
96 struct linux_prom_ranges ranges[PROMREG_MAX];
98 success = prom_getproperty(node, "ranges",
102 num_ranges = (success/sizeof(struct linux_prom_ranges));
104 struct linux_prom_ranges parent_ranges[PROMREG_MAX];
105 int num_parent_ranges;
107 success = prom_getproperty(parent, "ranges",
108 (char *) parent_ranges,
109 sizeof (parent_ranges));
111 num_parent_ranges = (success/sizeof(struct linux_prom_ranges));
112 prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges);
115 prom_adjust_regs(regs, nregs, ranges, num_ranges);