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1da177e4 LT |
1 | /* devices.c: Initial scan of the prom device tree for important |
2 | * Sparc device nodes which we need to find. | |
3 | * | |
4 | * This is based on the sparc64 version, but sun4m doesn't always use | |
5 | * the hardware MIDs, so be careful. | |
6 | * | |
7 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/kernel.h> |
11 | #include <linux/threads.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/errno.h> | |
15 | ||
16 | #include <asm/page.h> | |
17 | #include <asm/oplib.h> | |
18 | #include <asm/smp.h> | |
19 | #include <asm/system.h> | |
20 | #include <asm/cpudata.h> | |
21 | ||
22 | extern void cpu_probe(void); | |
23 | extern void clock_stop_probe(void); /* tadpole.c */ | |
24 | extern void sun4c_probe_memerr_reg(void); | |
25 | ||
26 | static char *cpu_mid_prop(void) | |
27 | { | |
28 | if (sparc_cpu_model == sun4d) | |
29 | return "cpu-id"; | |
30 | return "mid"; | |
31 | } | |
32 | ||
33 | static int check_cpu_node(int nd, int *cur_inst, | |
34 | int (*compare)(int, int, void *), void *compare_arg, | |
35 | int *prom_node, int *mid) | |
36 | { | |
37 | char node_str[128]; | |
38 | ||
39 | prom_getstring(nd, "device_type", node_str, sizeof(node_str)); | |
40 | if (strcmp(node_str, "cpu")) | |
41 | return -ENODEV; | |
42 | ||
43 | if (!compare(nd, *cur_inst, compare_arg)) { | |
44 | if (prom_node) | |
45 | *prom_node = nd; | |
46 | if (mid) { | |
47 | *mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
48 | if (sparc_cpu_model == sun4m) | |
49 | *mid &= 3; | |
50 | } | |
51 | return 0; | |
52 | } | |
53 | ||
54 | (*cur_inst)++; | |
55 | ||
56 | return -ENODEV; | |
57 | } | |
58 | ||
59 | static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg, | |
60 | int *prom_node, int *mid) | |
61 | { | |
62 | int nd, cur_inst, err; | |
63 | ||
64 | nd = prom_root_node; | |
65 | cur_inst = 0; | |
66 | ||
67 | err = check_cpu_node(nd, &cur_inst, compare, compare_arg, | |
68 | prom_node, mid); | |
69 | if (!err) | |
70 | return 0; | |
71 | ||
72 | nd = prom_getchild(nd); | |
73 | while ((nd = prom_getsibling(nd)) != 0) { | |
74 | err = check_cpu_node(nd, &cur_inst, compare, compare_arg, | |
75 | prom_node, mid); | |
76 | if (!err) | |
77 | return 0; | |
78 | } | |
79 | ||
80 | return -ENODEV; | |
81 | } | |
82 | ||
83 | static int cpu_instance_compare(int nd, int instance, void *_arg) | |
84 | { | |
85 | int desired_instance = (int) _arg; | |
86 | ||
87 | if (instance == desired_instance) | |
88 | return 0; | |
89 | return -ENODEV; | |
90 | } | |
91 | ||
92 | int cpu_find_by_instance(int instance, int *prom_node, int *mid) | |
93 | { | |
94 | return __cpu_find_by(cpu_instance_compare, (void *)instance, | |
95 | prom_node, mid); | |
96 | } | |
97 | ||
98 | static int cpu_mid_compare(int nd, int instance, void *_arg) | |
99 | { | |
100 | int desired_mid = (int) _arg; | |
101 | int this_mid; | |
102 | ||
103 | this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
104 | if (this_mid == desired_mid | |
105 | || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid)) | |
106 | return 0; | |
107 | return -ENODEV; | |
108 | } | |
109 | ||
110 | int cpu_find_by_mid(int mid, int *prom_node) | |
111 | { | |
112 | return __cpu_find_by(cpu_mid_compare, (void *)mid, | |
113 | prom_node, NULL); | |
114 | } | |
115 | ||
116 | /* sun4m uses truncated mids since we base the cpuid on the ttable/irqset | |
117 | * address (0-3). This gives us the true hardware mid, which might have | |
118 | * some other bits set. On 4d hardware and software mids are the same. | |
119 | */ | |
120 | int cpu_get_hwmid(int prom_node) | |
121 | { | |
122 | return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV); | |
123 | } | |
124 | ||
125 | void __init device_scan(void) | |
126 | { | |
127 | prom_printf("Booting Linux...\n"); | |
128 | ||
129 | #ifndef CONFIG_SMP | |
130 | { | |
131 | int err, cpu_node; | |
132 | err = cpu_find_by_instance(0, &cpu_node, NULL); | |
133 | if (err) { | |
134 | /* Probably a sun4e, Sun is trying to trick us ;-) */ | |
135 | prom_printf("No cpu nodes, cannot continue\n"); | |
136 | prom_halt(); | |
137 | } | |
138 | cpu_data(0).clock_tick = prom_getintdefault(cpu_node, | |
139 | "clock-frequency", | |
140 | 0); | |
141 | } | |
142 | #endif /* !CONFIG_SMP */ | |
143 | ||
144 | cpu_probe(); | |
145 | #ifdef CONFIG_SUN_AUXIO | |
146 | { | |
147 | extern void auxio_probe(void); | |
148 | extern void auxio_power_probe(void); | |
149 | auxio_probe(); | |
150 | auxio_power_probe(); | |
151 | } | |
152 | #endif | |
153 | clock_stop_probe(); | |
154 | ||
155 | if (ARCH_SUN4C_SUN4) | |
156 | sun4c_probe_memerr_reg(); | |
157 | ||
158 | return; | |
159 | } |