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Commit | Line | Data |
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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> | |
c2d3bffe | 18 | #include <asm/prom.h> |
1da177e4 LT |
19 | #include <asm/smp.h> |
20 | #include <asm/system.h> | |
21 | #include <asm/cpudata.h> | |
22 | ||
23 | extern void cpu_probe(void); | |
24 | extern void clock_stop_probe(void); /* tadpole.c */ | |
25 | extern void sun4c_probe_memerr_reg(void); | |
26 | ||
27 | static char *cpu_mid_prop(void) | |
28 | { | |
29 | if (sparc_cpu_model == sun4d) | |
30 | return "cpu-id"; | |
31 | return "mid"; | |
32 | } | |
33 | ||
34 | static int check_cpu_node(int nd, int *cur_inst, | |
35 | int (*compare)(int, int, void *), void *compare_arg, | |
36 | int *prom_node, int *mid) | |
37 | { | |
1da177e4 LT |
38 | if (!compare(nd, *cur_inst, compare_arg)) { |
39 | if (prom_node) | |
40 | *prom_node = nd; | |
41 | if (mid) { | |
42 | *mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
43 | if (sparc_cpu_model == sun4m) | |
44 | *mid &= 3; | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | ||
49 | (*cur_inst)++; | |
50 | ||
51 | return -ENODEV; | |
52 | } | |
53 | ||
54 | static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg, | |
55 | int *prom_node, int *mid) | |
56 | { | |
c2d3bffe DM |
57 | struct device_node *dp; |
58 | int cur_inst; | |
1da177e4 | 59 | |
1da177e4 | 60 | cur_inst = 0; |
c2d3bffe DM |
61 | for_each_node_by_type(dp, "cpu") { |
62 | int err = check_cpu_node(dp->node, &cur_inst, | |
63 | compare, compare_arg, | |
64 | prom_node, mid); | |
1da177e4 LT |
65 | if (!err) |
66 | return 0; | |
67 | } | |
68 | ||
69 | return -ENODEV; | |
70 | } | |
71 | ||
72 | static int cpu_instance_compare(int nd, int instance, void *_arg) | |
73 | { | |
74 | int desired_instance = (int) _arg; | |
75 | ||
76 | if (instance == desired_instance) | |
77 | return 0; | |
78 | return -ENODEV; | |
79 | } | |
80 | ||
81 | int cpu_find_by_instance(int instance, int *prom_node, int *mid) | |
82 | { | |
83 | return __cpu_find_by(cpu_instance_compare, (void *)instance, | |
84 | prom_node, mid); | |
85 | } | |
86 | ||
87 | static int cpu_mid_compare(int nd, int instance, void *_arg) | |
88 | { | |
89 | int desired_mid = (int) _arg; | |
90 | int this_mid; | |
91 | ||
92 | this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
93 | if (this_mid == desired_mid | |
94 | || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid)) | |
95 | return 0; | |
96 | return -ENODEV; | |
97 | } | |
98 | ||
99 | int cpu_find_by_mid(int mid, int *prom_node) | |
100 | { | |
101 | return __cpu_find_by(cpu_mid_compare, (void *)mid, | |
102 | prom_node, NULL); | |
103 | } | |
104 | ||
105 | /* sun4m uses truncated mids since we base the cpuid on the ttable/irqset | |
106 | * address (0-3). This gives us the true hardware mid, which might have | |
107 | * some other bits set. On 4d hardware and software mids are the same. | |
108 | */ | |
109 | int cpu_get_hwmid(int prom_node) | |
110 | { | |
111 | return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV); | |
112 | } | |
113 | ||
114 | void __init device_scan(void) | |
115 | { | |
116 | prom_printf("Booting Linux...\n"); | |
117 | ||
118 | #ifndef CONFIG_SMP | |
119 | { | |
120 | int err, cpu_node; | |
121 | err = cpu_find_by_instance(0, &cpu_node, NULL); | |
122 | if (err) { | |
123 | /* Probably a sun4e, Sun is trying to trick us ;-) */ | |
124 | prom_printf("No cpu nodes, cannot continue\n"); | |
125 | prom_halt(); | |
126 | } | |
127 | cpu_data(0).clock_tick = prom_getintdefault(cpu_node, | |
128 | "clock-frequency", | |
129 | 0); | |
130 | } | |
131 | #endif /* !CONFIG_SMP */ | |
132 | ||
133 | cpu_probe(); | |
134 | #ifdef CONFIG_SUN_AUXIO | |
135 | { | |
136 | extern void auxio_probe(void); | |
137 | extern void auxio_power_probe(void); | |
138 | auxio_probe(); | |
139 | auxio_power_probe(); | |
140 | } | |
141 | #endif | |
142 | clock_stop_probe(); | |
143 | ||
144 | if (ARCH_SUN4C_SUN4) | |
145 | sun4c_probe_memerr_reg(); | |
146 | ||
147 | return; | |
148 | } |