root/arch/sparc/kernel/devices.c

/* */

DEFINITIONS

1. device_scan

   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/kernel.h>
   8 #include <linux/tasks.h>
   9 #include <linux/config.h>
  10 
  11 #include <asm/page.h>
  12 #include <asm/oplib.h>
  13 #include <asm/smp.h>
  14 #include <asm/system.h>
  15 
  16 struct prom_cpuinfo linux_cpus[NCPUS];
  17 int linux_num_cpus;
  18 
  19 extern void cpu_probe(void);
  20 extern void clock_stop_probe(void); /* tadpole.c */
  21 
  22 unsigned long
  23 device_scan(unsigned long mem_start)
     /*  */
  24 {
  25         char node_str[128];
  26         int nd, prom_node_cpu, thismid;
  27         int cpu_nds[NCPUS];  /* One node for each cpu */
  28         int cpu_ctr = 0;
  29 
  30 #if CONFIG_AP1000
  31         printk("Not scanning device list for CPUs\n");
  32         linux_num_cpus = 1;
  33         return;
  34 #endif
  35 
  36         prom_getstring(prom_root_node, "device_type", node_str, sizeof(node_str));
  37 
  38         if(strcmp(node_str, "cpu") == 0) {
  39                 cpu_nds[0] = prom_root_node;
  40                 cpu_ctr++;
  41         } else {
  42                 int scan;
  43                 scan = prom_getchild(prom_root_node);
  44                 prom_printf("root child is %08lx\n", (unsigned long) scan);
  45                 nd = 0;
  46                 while((scan = prom_getsibling(scan)) != 0) {
  47                         prom_getstring(scan, "device_type", node_str, sizeof(node_str));
  48                         if(strcmp(node_str, "cpu") == 0) {
  49                                 cpu_nds[cpu_ctr] = scan;
  50                                 linux_cpus[cpu_ctr].prom_node = scan;
  51                                 prom_getproperty(scan, "mid", (char *) &thismid, sizeof(thismid));
  52                                 linux_cpus[cpu_ctr].mid = thismid;
  53                                 prom_printf("Found CPU %d <node=%08lx,mid=%d>\n",
  54                                             cpu_ctr, (unsigned long) scan,
  55                                             thismid);
  56                                 cpu_ctr++;
  57                         }
  58                 };
  59                 if(cpu_ctr == 0) {
  60                         printk("No CPU nodes found, cannot continue.\n");
  61                         /* Probably a sun4d or sun4e, Sun is trying to trick us ;-) */
  62                         halt();
  63                 }
  64                 printk("Found %d CPU prom device tree node(s).\n", cpu_ctr);
  65         };
  66         prom_node_cpu = cpu_nds[0];
  67 
  68         linux_num_cpus = cpu_ctr;
  69 
  70         cpu_probe();
  71 #if CONFIG_SUN_AUXIO
  72         {
  73           extern void auxio_probe(void);
  74           auxio_probe();
  75         }
  76 #endif
  77         clock_stop_probe();
  78 
  79         return mem_start;
  80 }

/* */