1 /* devices.c: Initial scan of the prom device tree for important
2 * Sparc device nodes which we need to find.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7 #include <linux/config.h>
8 #include <linux/kernel.h>
9 #include <linux/threads.h>
10 #include <linux/init.h>
11 #include <linux/ioport.h>
12 #include <linux/string.h>
13
14 #include <asm/page.h>
15 #include <asm/oplib.h>
16 #include <asm/system.h>
17 #include <asm/smp.h>
18 #include <asm/spitfire.h>
19
20 struct prom_cpuinfo linux_cpus[64] __initdata = { { 0 } };
21 unsigned prom_cpu_nodes[64];
22 int linux_num_cpus = 0;
23
24 extern void cpu_probe(void);
25 extern void central_probe(void);
26
device_scan(void)27 void __init device_scan(void)
28 {
29 char node_str[128];
30 int nd, prom_node_cpu, thismid;
31 int cpu_nds[64]; /* One node for each cpu */
32 int cpu_ctr = 0;
33
34 /* FIX ME FAST... -DaveM */
35 ioport_resource.end = 0xffffffffffffffffUL;
36 iomem_resource.end = 0xffffffffffffffffUL;
37
38 prom_getstring(prom_root_node, "device_type", node_str, sizeof(node_str));
39
40 prom_printf("Booting Linux...\n");
41 if(strcmp(node_str, "cpu") == 0) {
42 cpu_nds[0] = prom_root_node;
43 linux_cpus[0].prom_node = prom_root_node;
44 linux_cpus[0].mid = 0;
45 cpu_ctr++;
46 } else {
47 int scan;
48 scan = prom_getchild(prom_root_node);
49 /* prom_printf("root child is %08x\n", (unsigned) scan); */
50 nd = 0;
51 while((scan = prom_getsibling(scan)) != 0) {
52 prom_getstring(scan, "device_type", node_str, sizeof(node_str));
53 if(strcmp(node_str, "cpu") == 0) {
54 cpu_nds[cpu_ctr] = scan;
55 linux_cpus[cpu_ctr].prom_node = scan;
56 thismid = 0;
57 if (tlb_type == spitfire) {
58 prom_getproperty(scan, "upa-portid",
59 (char *) &thismid, sizeof(thismid));
60 } else if (tlb_type == cheetah ||
61 tlb_type == cheetah_plus) {
62 prom_getproperty(scan, "portid",
63 (char *) &thismid, sizeof(thismid));
64 }
65 linux_cpus[cpu_ctr].mid = thismid;
66 printk("Found CPU %d (node=%08x,mid=%d)\n",
67 cpu_ctr, (unsigned) scan, thismid);
68 cpu_ctr++;
69 }
70 };
71 if(cpu_ctr == 0) {
72 prom_printf("No CPU nodes found, cannot continue.\n");
73 prom_halt();
74 }
75 printk("Found %d CPU prom device tree node(s).\n", cpu_ctr);
76 }
77 prom_node_cpu = cpu_nds[0];
78
79 linux_num_cpus = cpu_ctr;
80
81 prom_cpu_nodes[0] = prom_node_cpu;
82
83 #ifndef CONFIG_SMP
84 {
85 extern unsigned long up_clock_tick;
86 up_clock_tick = prom_getintdefault(prom_node_cpu,
87 "clock-frequency",
88 0);
89 }
90 #endif
91
92 central_probe();
93
94 cpu_probe();
95 }
96