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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* devices.c: Initial scan of the prom device tree for important |
3 | * Sparc device nodes which we need to find. | |
4 | * | |
5 | * This is based on the sparc64 version, but sun4m doesn't always use | |
6 | * the hardware MIDs, so be careful. | |
7 | * | |
8 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/threads.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/errno.h> | |
16 | ||
17 | #include <asm/page.h> | |
18 | #include <asm/oplib.h> | |
c2d3bffe | 19 | #include <asm/prom.h> |
1da177e4 | 20 | #include <asm/smp.h> |
1da177e4 | 21 | #include <asm/cpudata.h> |
d550bbd4 | 22 | #include <asm/cpu_type.h> |
8885ec7c | 23 | #include <asm/setup.h> |
1da177e4 | 24 | |
6b5f02f3 | 25 | #include "kernel.h" |
1da177e4 LT |
26 | |
27 | static char *cpu_mid_prop(void) | |
28 | { | |
29 | if (sparc_cpu_model == sun4d) | |
30 | return "cpu-id"; | |
31 | return "mid"; | |
32 | } | |
33 | ||
8d125562 AS |
34 | static int check_cpu_node(phandle nd, int *cur_inst, |
35 | int (*compare)(phandle, int, void *), void *compare_arg, | |
36 | phandle *prom_node, int *mid) | |
1da177e4 | 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 | ||
8d125562 AS |
54 | static int __cpu_find_by(int (*compare)(phandle, int, void *), |
55 | void *compare_arg, phandle *prom_node, int *mid) | |
1da177e4 | 56 | { |
c2d3bffe DM |
57 | struct device_node *dp; |
58 | int cur_inst; | |
1da177e4 | 59 | |
1da177e4 | 60 | cur_inst = 0; |
c2d3bffe | 61 | for_each_node_by_type(dp, "cpu") { |
6016a363 | 62 | int err = check_cpu_node(dp->phandle, &cur_inst, |
c2d3bffe DM |
63 | compare, compare_arg, |
64 | prom_node, mid); | |
b127aa8b JL |
65 | if (!err) { |
66 | of_node_put(dp); | |
1da177e4 | 67 | return 0; |
b127aa8b | 68 | } |
1da177e4 LT |
69 | } |
70 | ||
71 | return -ENODEV; | |
72 | } | |
73 | ||
8d125562 | 74 | static int cpu_instance_compare(phandle nd, int instance, void *_arg) |
1da177e4 LT |
75 | { |
76 | int desired_instance = (int) _arg; | |
77 | ||
78 | if (instance == desired_instance) | |
79 | return 0; | |
80 | return -ENODEV; | |
81 | } | |
82 | ||
8d125562 | 83 | int cpu_find_by_instance(int instance, phandle *prom_node, int *mid) |
1da177e4 LT |
84 | { |
85 | return __cpu_find_by(cpu_instance_compare, (void *)instance, | |
86 | prom_node, mid); | |
87 | } | |
88 | ||
8d125562 | 89 | static int cpu_mid_compare(phandle nd, int instance, void *_arg) |
1da177e4 LT |
90 | { |
91 | int desired_mid = (int) _arg; | |
92 | int this_mid; | |
93 | ||
94 | this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0); | |
95 | if (this_mid == desired_mid | |
96 | || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid)) | |
97 | return 0; | |
98 | return -ENODEV; | |
99 | } | |
100 | ||
8d125562 | 101 | int cpu_find_by_mid(int mid, phandle *prom_node) |
1da177e4 LT |
102 | { |
103 | return __cpu_find_by(cpu_mid_compare, (void *)mid, | |
104 | prom_node, NULL); | |
105 | } | |
106 | ||
107 | /* sun4m uses truncated mids since we base the cpuid on the ttable/irqset | |
108 | * address (0-3). This gives us the true hardware mid, which might have | |
109 | * some other bits set. On 4d hardware and software mids are the same. | |
110 | */ | |
8d125562 | 111 | int cpu_get_hwmid(phandle prom_node) |
1da177e4 LT |
112 | { |
113 | return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV); | |
114 | } | |
115 | ||
116 | void __init device_scan(void) | |
117 | { | |
7671fa22 | 118 | printk(KERN_NOTICE "Booting Linux...\n"); |
1da177e4 LT |
119 | |
120 | #ifndef CONFIG_SMP | |
121 | { | |
8d125562 AS |
122 | phandle cpu_node; |
123 | int err; | |
1da177e4 LT |
124 | err = cpu_find_by_instance(0, &cpu_node, NULL); |
125 | if (err) { | |
126 | /* Probably a sun4e, Sun is trying to trick us ;-) */ | |
127 | prom_printf("No cpu nodes, cannot continue\n"); | |
128 | prom_halt(); | |
129 | } | |
130 | cpu_data(0).clock_tick = prom_getintdefault(cpu_node, | |
131 | "clock-frequency", | |
132 | 0); | |
133 | } | |
134 | #endif /* !CONFIG_SMP */ | |
135 | ||
a3ee8faa SR |
136 | auxio_probe(); |
137 | auxio_power_probe(); | |
1da177e4 | 138 | } |