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
);