arch/mips/dec/prom/init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * init.c: PROM library initialisation code.
   4  *
   5  * Copyright (C) 1998 Harald Koerfgen
   6  * Copyright (C) 2002, 2004  Maciej W. Rozycki
   7  */
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/linkage.h>
  11 #include <linux/smp.h>
  12 #include <linux/string.h>
  13 #include <linux/types.h>
  14
  15 #include <asm/bootinfo.h>
  16 #include <asm/cpu.h>
  17 #include <asm/cpu-type.h>
  18 #include <asm/processor.h>
  19
  20 #include <asm/dec/prom.h>
  21
  22
  23 int (*__rex_bootinit)(void);
  24 int (*__rex_bootread)(void);
  25 int (*__rex_getbitmap)(memmap *);
  26 unsigned long *(*__rex_slot_address)(int);
  27 void *(*__rex_gettcinfo)(void);
  28 int (*__rex_getsysid)(void);
  29 void (*__rex_clear_cache)(void);
  30
  31 int (*__prom_getchar)(void);
  32 char *(*__prom_getenv)(char *);
  33 int (*__prom_printf)(char *, ...);
  34
  35 int (*__pmax_open)(char*, int);
  36 int (*__pmax_lseek)(int, long, int);
  37 int (*__pmax_read)(int, void *, int);
  38 int (*__pmax_close)(int);
  39
  40
  41 /*
  42  * Detect which PROM the DECSTATION has, and set the callback vectors
  43  * appropriately.
  44  */
  45 void __init which_prom(s32 magic, s32 *prom_vec)
  46 {
  47         /*
  48          * No sign of the REX PROM's magic number means we assume a non-REX
  49          * machine (i.e. we're on a DS2100/3100, DS5100 or DS5000/2xx)
  50          */
  51         if (prom_is_rex(magic)) {
  52                 /*
  53                  * Set up prom abstraction structure with REX entry points.
  54                  */
  55                 __rex_bootinit =
  56                         (void *)(long)*(prom_vec + REX_PROM_BOOTINIT);
  57                 __rex_bootread =
  58                         (void *)(long)*(prom_vec + REX_PROM_BOOTREAD);
  59                 __rex_getbitmap =
  60                         (void *)(long)*(prom_vec + REX_PROM_GETBITMAP);
  61                 __prom_getchar =
  62                         (void *)(long)*(prom_vec + REX_PROM_GETCHAR);
  63                 __prom_getenv =
  64                         (void *)(long)*(prom_vec + REX_PROM_GETENV);
  65                 __rex_getsysid =
  66                         (void *)(long)*(prom_vec + REX_PROM_GETSYSID);
  67                 __rex_gettcinfo =
  68                         (void *)(long)*(prom_vec + REX_PROM_GETTCINFO);
  69                 __prom_printf =
  70                         (void *)(long)*(prom_vec + REX_PROM_PRINTF);
  71                 __rex_slot_address =
  72                         (void *)(long)*(prom_vec + REX_PROM_SLOTADDR);
  73                 __rex_clear_cache =
  74                         (void *)(long)*(prom_vec + REX_PROM_CLEARCACHE);
  75         } else {
  76                 /*
  77                  * Set up prom abstraction structure with non-REX entry points.
  78                  */
  79                 __prom_getchar = (void *)PMAX_PROM_GETCHAR;
  80                 __prom_getenv = (void *)PMAX_PROM_GETENV;
  81                 __prom_printf = (void *)PMAX_PROM_PRINTF;
  82                 __pmax_open = (void *)PMAX_PROM_OPEN;
  83                 __pmax_lseek = (void *)PMAX_PROM_LSEEK;
  84                 __pmax_read = (void *)PMAX_PROM_READ;
  85                 __pmax_close = (void *)PMAX_PROM_CLOSE;
  86         }
  87 }
  88
  89 void __init prom_init(void)
  90 {
  91         extern void dec_machine_halt(void);
  92         static const char cpu_msg[] __initconst =
  93                 "Sorry, this kernel is compiled for a wrong CPU type!\n";
  94         s32 argc = fw_arg0;
  95         s32 *argv = (void *)fw_arg1;
  96         u32 magic = fw_arg2;
  97         s32 *prom_vec = (void *)fw_arg3;
  98
  99         /*
 100          * Determine which PROM we have
 101          * (and therefore which machine we're on!)
 102          */
 103         which_prom(magic, prom_vec);
 104
 105         if (prom_is_rex(magic))
 106                 rex_clear_cache();
 107
 108         /* Register the early console.  */
 109         register_prom_console();
 110
 111         /* Were we compiled with the right CPU option? */
 112 #if defined(CONFIG_CPU_R3000)
 113         if ((current_cpu_type() == CPU_R4000SC) ||
 114             (current_cpu_type() == CPU_R4400SC)) {
 115                 static const char r4k_msg[] __initconst =
 116                         "Please recompile with \"CONFIG_CPU_R4x00 = y\".\n";
 117                 printk(cpu_msg);
 118                 printk(r4k_msg);
 119                 dec_machine_halt();
 120         }
 121 #endif
 122
 123 #if defined(CONFIG_CPU_R4X00)
 124         if ((current_cpu_type() == CPU_R3000) ||
 125             (current_cpu_type() == CPU_R3000A)) {
 126                 static const char r3k_msg[] __initconst =
 127                         "Please recompile with \"CONFIG_CPU_R3000 = y\".\n";
 128                 printk(cpu_msg);
 129                 printk(r3k_msg);
 130                 dec_machine_halt();
 131         }
 132 #endif
 133
 134         prom_meminit(magic);
 135         prom_identify_arch(magic);
 136         prom_init_cmdline(argc, argv, magic);
 137 }