arch/mips/dec/prom/init.c

   1 /*
   2  * init.c: PROM library initialisation code.
   3  *
   4  * Copyright (C) 1998 Harald Koerfgen
   5  * Copyright (C) 2002, 2004  Maciej W. Rozycki
   6  */
   7 #include <linux/config.h>
   8 #include <linux/init.h>
   9 #include <linux/smp.h>
  10 #include <linux/string.h>
  11 #include <linux/types.h>
  12
  13 #include <asm/bootinfo.h>
  14 #include <asm/cpu.h>
  15 #include <asm/processor.h>
  16
  17 #include <asm/dec/prom.h>
  18
  19
  20 int (*__rex_bootinit)(void);
  21 int (*__rex_bootread)(void);
  22 int (*__rex_getbitmap)(memmap *);
  23 unsigned long *(*__rex_slot_address)(int);
  24 void *(*__rex_gettcinfo)(void);
  25 int (*__rex_getsysid)(void);
  26 void (*__rex_clear_cache)(void);
  27
  28 int (*__prom_getchar)(void);
  29 char *(*__prom_getenv)(char *);
  30 int (*__prom_printf)(char *, ...);
  31
  32 int (*__pmax_open)(char*, int);
  33 int (*__pmax_lseek)(int, long, int);
  34 int (*__pmax_read)(int, void *, int);
  35 int (*__pmax_close)(int);
  36
  37
  38 /*
  39  * Detect which PROM the DECSTATION has, and set the callback vectors
  40  * appropriately.
  41  */
  42 void __init which_prom(s32 magic, s32 *prom_vec)
  43 {
  44         /*
  45          * No sign of the REX PROM's magic number means we assume a non-REX
  46          * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
  47          */
  48         if (prom_is_rex(magic)) {
  49                 /*
  50                  * Set up prom abstraction structure with REX entry points.
  51                  */
  52                 __rex_bootinit =
  53                         (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
  54                 __rex_bootread =
  55                         (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
  56                 __rex_getbitmap =
  57                         (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
  58                 __prom_getchar =
  59                         (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
  60                 __prom_getenv =
  61                         (void *)(long)*(prom_vec + REX_PROM_GETENV);
  62                 __rex_getsysid =
  63                         (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
  64                 __rex_gettcinfo =
  65                         (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
  66                 __prom_printf =
  67                         (void *)(long)*(prom_vec + REX_PROM_PRINTF);
  68                 __rex_slot_address =
  69                         (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
  70                 __rex_clear_cache =
  71                         (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
  72         } else {
  73                 /*
  74                  * Set up prom abstraction structure with non-REX entry points.
  75                  */
  76                 __prom_getchar = (void *)PMAX_PROM_GETCHAR;
  77                 __prom_getenv = (void *)PMAX_PROM_GETENV;
  78                 __prom_printf = (void *)PMAX_PROM_PRINTF;
  79                 __pmax_open = (void *)PMAX_PROM_OPEN;
  80                 __pmax_lseek = (void *)PMAX_PROM_LSEEK;
  81                 __pmax_read = (void *)PMAX_PROM_READ;
  82                 __pmax_close = (void *)PMAX_PROM_CLOSE;
  83         }
  84 }
  85
  86 void __init prom_init(void)
  87 {
  88         extern void dec_machine_halt(void);
  89         static char cpu_msg[] __initdata =
  90                 "Sorry, this kernel is compiled for a wrong CPU type!\n";
  91         static char r3k_msg[] __initdata =
  92                 "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
  93         static char r4k_msg[] __initdata =
  94                 "Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
  95         s32 argc = fw_arg0;
  96         s32 argv = fw_arg1;
  97         u32 magic = fw_arg2;
  98         s32 prom_vec = fw_arg3;
  99
 100         /*
 101          * Determine which PROM we have
 102          * (and therefore which machine we're on!)
 103          */
 104         which_prom(magic, prom_vec);
 105
 106         if (prom_is_rex(magic))
 107                 rex_clear_cache();
 108
 109         /* Register the early console.  */
 110         register_prom_console();
 111
 112         /* Were we compiled with the right CPU option? */
 113 #if defined(CONFIG_CPU_R3000)
 114         if ((current_cpu_data.cputype == CPU_R4000SC) ||
 115             (current_cpu_data.cputype == CPU_R4400SC)) {
 116                 printk(cpu_msg);
 117                 printk(r4k_msg);
 118                 dec_machine_halt();
 119         }
 120 #endif
 121
 122 #if defined(CONFIG_CPU_R4X00)
 123         if ((current_cpu_data.cputype == CPU_R3000) ||
 124             (current_cpu_data.cputype == CPU_R3000A)) {
 125                 printk(cpu_msg);
 126                 printk(r3k_msg);
 127                 dec_machine_halt();
 128         }
 129 #endif
 130
 131         prom_meminit(magic);
 132         prom_identify_arch(magic);
 133         prom_init_cmdline(argc, argv, magic);
 134 }