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review.evervolv.com / android_kernel_lge_hammerhead / ecffdde68ebefa1aa24411a91b12ae649f71f71c / . / arch / sparc64 / kernel / devices.c
blob: d710274e516bf6a400b573473692611b6dbe024c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/* devices.c: Initial scan of the prom device tree for important
2 * Sparc device nodes which we need to find.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7#include <linux/config.h>
8#include <linux/kernel.h>
9#include <linux/threads.h>
10#include <linux/init.h>
11#include <linux/ioport.h>
12#include <linux/string.h>
13#include <linux/spinlock.h>
14#include <linux/errno.h>
15
16#include <asm/page.h>
17#include <asm/oplib.h>
18#include <asm/system.h>
19#include <asm/smp.h>
20#include <asm/spitfire.h>
21#include <asm/timer.h>
22#include <asm/cpudata.h>
23
24/* Used to synchronize acceses to NatSemi SUPER I/O chip configure
25 * operations in asm/ns87303.h
26 */
27DEFINE_SPINLOCK(ns87303_lock);
28
29extern void cpu_probe(void);
30extern void central_probe(void);
31
32static char *cpu_mid_prop(void)
33{
34 if (tlb_type == spitfire)
35 return "upa-portid";
36 return "portid";
37}
38
39static int check_cpu_node(int nd, int *cur_inst,
40 int (*compare)(int, int, void *), void *compare_arg,
41 int *prom_node, int *mid)
42{
43 char node_str[128];
44
45 prom_getstring(nd, "device_type", node_str, sizeof(node_str));
46 if (strcmp(node_str, "cpu"))
47 return -ENODEV;
48
49 if (!compare(nd, *cur_inst, compare_arg)) {
50 if (prom_node)
51 *prom_node = nd;
52 if (mid)
53 *mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
54 return 0;
55 }
56
57 (*cur_inst)++;
58
59 return -ENODEV;
60}
61
62static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
63 int *prom_node, int *mid)
64{
65 int nd, cur_inst, err;
66
67 nd = prom_root_node;
68 cur_inst = 0;
69
70 err = check_cpu_node(nd, &cur_inst,
71 compare, compare_arg,
72 prom_node, mid);
73 if (err == 0)
74 return 0;
75
76 nd = prom_getchild(nd);
77 while ((nd = prom_getsibling(nd)) != 0) {
78 err = check_cpu_node(nd, &cur_inst,
79 compare, compare_arg,
80 prom_node, mid);
81 if (err == 0)
82 return 0;
83 }
84
85 return -ENODEV;
86}
87
88static int cpu_instance_compare(int nd, int instance, void *_arg)
89{
90 int desired_instance = (int) (long) _arg;
91
92 if (instance == desired_instance)
93 return 0;
94 return -ENODEV;
95}
96
97int cpu_find_by_instance(int instance, int *prom_node, int *mid)
98{
99 return __cpu_find_by(cpu_instance_compare, (void *)(long)instance,
100 prom_node, mid);
101}
102
103static int cpu_mid_compare(int nd, int instance, void *_arg)
104{
105 int desired_mid = (int) (long) _arg;
106 int this_mid;
107
108 this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
109 if (this_mid == desired_mid)
110 return 0;
111 return -ENODEV;
112}
113
114int cpu_find_by_mid(int mid, int *prom_node)
115{
116 return __cpu_find_by(cpu_mid_compare, (void *)(long)mid,
117 prom_node, NULL);
118}
119
120void __init device_scan(void)
121{
122 /* FIX ME FAST... -DaveM */
123 ioport_resource.end = 0xffffffffffffffffUL;
124
125 prom_printf("Booting Linux...\n");
126
127#ifndef CONFIG_SMP
128 {
129 int err, cpu_node;
130 err = cpu_find_by_instance(0, &cpu_node, NULL);
131 if (err) {
132 prom_printf("No cpu nodes, cannot continue\n");
133 prom_halt();
134 }
135 cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
136 "clock-frequency",
137 0);
138 }
139#endif
140
141 central_probe();
142
143 cpu_probe();
144}