Commit | Line | Data |
---|---|---|
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 | 19 | #include <asm/smp.h> |
1da177e4 | 20 | #include <asm/cpudata.h> |
d550bbd4 | 21 | #include <asm/cpu_type.h> |
8885ec7c | 22 | #include <asm/setup.h> |
1da177e4 | 23 | |
6b5f02f3 | 24 | #include "kernel.h" |
1da177e4 LT |
25 | |
26 | static char *cpu_mid_prop(void) | |
27 | { | |
28 | if (sparc_cpu_model == sun4d) | |
29 | return "cpu-id"; | |
30 | return "mid"; | |
31 | } | |
32 | ||
8d125562 AS |
33 | static int check_cpu_node(phandle nd, int *cur_inst, |
34 | int (*compare)(phandle, int, void *), void *compare_arg, | |
35 | phandle *prom_node, int *mid) | |
1da177e4 | 36 | { |
1da177e4 LT |
37 | if (!compare(nd, *cur_inst, compare_arg)) { |
38 | if (prom_node) | |
39 | *prom_node = nd; | |
40 | if (mid) { | |
41 | *mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
42 | if (sparc_cpu_model == sun4m) | |
43 | *mid &= 3; | |
44 | } | |
45 | return 0; | |
46 | } | |
47 | ||
48 | (*cur_inst)++; | |
49 | ||
50 | return -ENODEV; | |
51 | } | |
52 | ||
8d125562 AS |
53 | static int __cpu_find_by(int (*compare)(phandle, int, void *), |
54 | void *compare_arg, phandle *prom_node, int *mid) | |
1da177e4 | 55 | { |
c2d3bffe DM |
56 | struct device_node *dp; |
57 | int cur_inst; | |
1da177e4 | 58 | |
1da177e4 | 59 | cur_inst = 0; |
c2d3bffe | 60 | for_each_node_by_type(dp, "cpu") { |
6016a363 | 61 | int err = check_cpu_node(dp->phandle, &cur_inst, |
c2d3bffe DM |
62 | compare, compare_arg, |
63 | prom_node, mid); | |
b127aa8b JL |
64 | if (!err) { |
65 | of_node_put(dp); | |
1da177e4 | 66 | return 0; |
b127aa8b | 67 | } |
1da177e4 LT |
68 | } |
69 | ||
70 | return -ENODEV; | |
71 | } | |
72 | ||
8d125562 | 73 | static int cpu_instance_compare(phandle nd, int instance, void *_arg) |
1da177e4 LT |
74 | { |
75 | int desired_instance = (int) _arg; | |
76 | ||
77 | if (instance == desired_instance) | |
78 | return 0; | |
79 | return -ENODEV; | |
80 | } | |
81 | ||
8d125562 | 82 | int cpu_find_by_instance(int instance, phandle *prom_node, int *mid) |
1da177e4 LT |
83 | { |
84 | return __cpu_find_by(cpu_instance_compare, (void *)instance, | |
85 | prom_node, mid); | |
86 | } | |
87 | ||
8d125562 | 88 | static int cpu_mid_compare(phandle nd, int instance, void *_arg) |
1da177e4 LT |
89 | { |
90 | int desired_mid = (int) _arg; | |
91 | int this_mid; | |
92 | ||
93 | this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
94 | if (this_mid == desired_mid | |
95 | || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid)) | |
96 | return 0; | |
97 | return -ENODEV; | |
98 | } | |
99 | ||
8d125562 | 100 | int cpu_find_by_mid(int mid, phandle *prom_node) |
1da177e4 LT |
101 | { |
102 | return __cpu_find_by(cpu_mid_compare, (void *)mid, | |
103 | prom_node, NULL); | |
104 | } | |
105 | ||
106 | /* sun4m uses truncated mids since we base the cpuid on the ttable/irqset | |
107 | * address (0-3). This gives us the true hardware mid, which might have | |
108 | * some other bits set. On 4d hardware and software mids are the same. | |
109 | */ | |
8d125562 | 110 | int cpu_get_hwmid(phandle prom_node) |
1da177e4 LT |
111 | { |
112 | return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV); | |
113 | } | |
114 | ||
115 | void __init device_scan(void) | |
116 | { | |
7671fa22 | 117 | printk(KERN_NOTICE "Booting Linux...\n"); |
1da177e4 LT |
118 | |
119 | #ifndef CONFIG_SMP | |
120 | { | |
8d125562 AS |
121 | phandle cpu_node; |
122 | int err; | |
1da177e4 LT |
123 | err = cpu_find_by_instance(0, &cpu_node, NULL); |
124 | if (err) { | |
125 | /* Probably a sun4e, Sun is trying to trick us ;-) */ | |
126 | prom_printf("No cpu nodes, cannot continue\n"); | |
127 | prom_halt(); | |
128 | } | |
129 | cpu_data(0).clock_tick = prom_getintdefault(cpu_node, | |
130 | "clock-frequency", | |
131 | 0); | |
132 | } | |
133 | #endif /* !CONFIG_SMP */ | |
134 | ||
a3ee8faa SR |
135 | auxio_probe(); |
136 | auxio_power_probe(); | |
1da177e4 | 137 | } |