Merge branch 'for-3.4/core' of git://git.kernel.dk/linux-block
[sfrench/cifs-2.6.git] / arch / sparc / prom / ranges.c
1 /*
2  * ranges.c: Handle ranges in newer proms for obio/sbus.
3  *
4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6  */
7
8 #include <linux/init.h>
9 #include <linux/module.h>
10
11 #include <asm/openprom.h>
12 #include <asm/oplib.h>
13 #include <asm/types.h>
14
15 static struct linux_prom_ranges promlib_obio_ranges[PROMREG_MAX];
16 static int num_obio_ranges;
17
18 /* Adjust register values based upon the ranges parameters. */
19 static void
20 prom_adjust_regs(struct linux_prom_registers *regp, int nregs,
21                  struct linux_prom_ranges *rangep, int nranges)
22 {
23         int regc, rngc;
24
25         for (regc = 0; regc < nregs; regc++) {
26                 for (rngc = 0; rngc < nranges; rngc++)
27                         if (regp[regc].which_io == rangep[rngc].ot_child_space)
28                                 break; /* Fount it */
29                 if (rngc == nranges) /* oops */
30                         prom_printf("adjust_regs: Could not find range with matching bus type...\n");
31                 regp[regc].which_io = rangep[rngc].ot_parent_space;
32                 regp[regc].phys_addr -= rangep[rngc].ot_child_base;
33                 regp[regc].phys_addr += rangep[rngc].ot_parent_base;
34         }
35 }
36
37 static void
38 prom_adjust_ranges(struct linux_prom_ranges *ranges1, int nranges1,
39                    struct linux_prom_ranges *ranges2, int nranges2)
40 {
41         int rng1c, rng2c;
42
43         for(rng1c=0; rng1c < nranges1; rng1c++) {
44                 for(rng2c=0; rng2c < nranges2; rng2c++)
45                         if(ranges1[rng1c].ot_parent_space == ranges2[rng2c].ot_child_space &&
46                            ranges1[rng1c].ot_parent_base >= ranges2[rng2c].ot_child_base &&
47                            ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base > 0U)
48                         break;
49                 if(rng2c == nranges2) /* oops */
50                         prom_printf("adjust_ranges: Could not find matching bus type...\n");
51                 else if (ranges1[rng1c].ot_parent_base + ranges1[rng1c].or_size > ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size)
52                         ranges1[rng1c].or_size =
53                                 ranges2[rng2c].ot_child_base + ranges2[rng2c].or_size - ranges1[rng1c].ot_parent_base;
54                 ranges1[rng1c].ot_parent_space = ranges2[rng2c].ot_parent_space;
55                 ranges1[rng1c].ot_parent_base += ranges2[rng2c].ot_parent_base;
56         }
57 }
58
59 /* Apply probed obio ranges to registers passed, if no ranges return. */
60 void
61 prom_apply_obio_ranges(struct linux_prom_registers *regs, int nregs)
62 {
63         if(num_obio_ranges)
64                 prom_adjust_regs(regs, nregs, promlib_obio_ranges, num_obio_ranges);
65 }
66 EXPORT_SYMBOL(prom_apply_obio_ranges);
67
68 void __init prom_ranges_init(void)
69 {
70         phandle node, obio_node;
71         int success;
72
73         num_obio_ranges = 0;
74
75         /* Check for obio and sbus ranges. */
76         node = prom_getchild(prom_root_node);
77         obio_node = prom_searchsiblings(node, "obio");
78
79         if(obio_node) {
80                 success = prom_getproperty(obio_node, "ranges",
81                                            (char *) promlib_obio_ranges,
82                                            sizeof(promlib_obio_ranges));
83                 if(success != -1)
84                         num_obio_ranges = (success/sizeof(struct linux_prom_ranges));
85         }
86
87         if(num_obio_ranges)
88                 prom_printf("PROMLIB: obio_ranges %d\n", num_obio_ranges);
89 }
90
91 void prom_apply_generic_ranges(phandle node, phandle parent,
92                 struct linux_prom_registers *regs, int nregs)
93 {
94         int success;
95         int num_ranges;
96         struct linux_prom_ranges ranges[PROMREG_MAX];
97         
98         success = prom_getproperty(node, "ranges",
99                                    (char *) ranges,
100                                    sizeof (ranges));
101         if (success != -1) {
102                 num_ranges = (success/sizeof(struct linux_prom_ranges));
103                 if (parent) {
104                         struct linux_prom_ranges parent_ranges[PROMREG_MAX];
105                         int num_parent_ranges;
106                 
107                         success = prom_getproperty(parent, "ranges",
108                                                    (char *) parent_ranges,
109                                                    sizeof (parent_ranges));
110                         if (success != -1) {
111                                 num_parent_ranges = (success/sizeof(struct linux_prom_ranges));
112                                 prom_adjust_ranges (ranges, num_ranges, parent_ranges, num_parent_ranges);
113                         }
114                 }
115                 prom_adjust_regs(regs, nregs, ranges, num_ranges);
116         }
117 }