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1// SPDX-License-Identifier: GPL-2.0
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
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>
19#include <asm/prom.h>
20#include <asm/smp.h>
21#include <asm/cpudata.h>
22#include <asm/cpu_type.h>
23#include <asm/setup.h>
24
25#include "kernel.h"
26
27static char *cpu_mid_prop(void)
28{
29 if (sparc_cpu_model == sun4d)
30 return "cpu-id";
31 return "mid";
32}
33
34static int check_cpu_node(phandle nd, int *cur_inst,
35 int (*compare)(phandle, int, void *), void *compare_arg,
36 phandle *prom_node, int *mid)
37{
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
54static int __cpu_find_by(int (*compare)(phandle, int, void *),
55 void *compare_arg, phandle *prom_node, int *mid)
56{
57 struct device_node *dp;
58 int cur_inst;
59
60 cur_inst = 0;
61 for_each_node_by_type(dp, "cpu") {
62 int err = check_cpu_node(dp->phandle, &cur_inst,
63 compare, compare_arg,
64 prom_node, mid);
65 if (!err) {
66 of_node_put(dp);
67 return 0;
68 }
69 }
70
71 return -ENODEV;
72}
73
74static int cpu_instance_compare(phandle nd, int instance, void *_arg)
75{
76 int desired_instance = (int) _arg;
77
78 if (instance == desired_instance)
79 return 0;
80 return -ENODEV;
81}
82
83int cpu_find_by_instance(int instance, phandle *prom_node, int *mid)
84{
85 return __cpu_find_by(cpu_instance_compare, (void *)instance,
86 prom_node, mid);
87}
88
89static int cpu_mid_compare(phandle nd, int instance, void *_arg)
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
101int cpu_find_by_mid(int mid, phandle *prom_node)
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 */
111int cpu_get_hwmid(phandle prom_node)
112{
113 return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
114}
115
116void __init device_scan(void)
117{
118 printk(KERN_NOTICE "Booting Linux...\n");
119
120#ifndef CONFIG_SMP
121 {
122 phandle cpu_node;
123 int err;
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
136 auxio_probe();
137 auxio_power_probe();
138}
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
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/prom.h>
19#include <asm/smp.h>
20#include <asm/cpudata.h>
21#include <asm/cpu_type.h>
22
23extern void clock_stop_probe(void); /* tadpole.c */
24
25static char *cpu_mid_prop(void)
26{
27 if (sparc_cpu_model == sun4d)
28 return "cpu-id";
29 return "mid";
30}
31
32static int check_cpu_node(phandle nd, int *cur_inst,
33 int (*compare)(phandle, int, void *), void *compare_arg,
34 phandle *prom_node, int *mid)
35{
36 if (!compare(nd, *cur_inst, compare_arg)) {
37 if (prom_node)
38 *prom_node = nd;
39 if (mid) {
40 *mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
41 if (sparc_cpu_model == sun4m)
42 *mid &= 3;
43 }
44 return 0;
45 }
46
47 (*cur_inst)++;
48
49 return -ENODEV;
50}
51
52static int __cpu_find_by(int (*compare)(phandle, int, void *),
53 void *compare_arg, phandle *prom_node, int *mid)
54{
55 struct device_node *dp;
56 int cur_inst;
57
58 cur_inst = 0;
59 for_each_node_by_type(dp, "cpu") {
60 int err = check_cpu_node(dp->phandle, &cur_inst,
61 compare, compare_arg,
62 prom_node, mid);
63 if (!err) {
64 of_node_put(dp);
65 return 0;
66 }
67 }
68
69 return -ENODEV;
70}
71
72static int cpu_instance_compare(phandle 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
81int cpu_find_by_instance(int instance, phandle *prom_node, int *mid)
82{
83 return __cpu_find_by(cpu_instance_compare, (void *)instance,
84 prom_node, mid);
85}
86
87static int cpu_mid_compare(phandle 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
99int cpu_find_by_mid(int mid, phandle *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 */
109int cpu_get_hwmid(phandle prom_node)
110{
111 return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
112}
113
114void __init device_scan(void)
115{
116 printk(KERN_NOTICE "Booting Linux...\n");
117
118#ifndef CONFIG_SMP
119 {
120 phandle cpu_node;
121 int err;
122 err = cpu_find_by_instance(0, &cpu_node, NULL);
123 if (err) {
124 /* Probably a sun4e, Sun is trying to trick us ;-) */
125 prom_printf("No cpu nodes, cannot continue\n");
126 prom_halt();
127 }
128 cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
129 "clock-frequency",
130 0);
131 }
132#endif /* !CONFIG_SMP */
133
134 {
135 extern void auxio_probe(void);
136 extern void auxio_power_probe(void);
137 auxio_probe();
138 auxio_power_probe();
139 }
140 clock_stop_probe();
141}