arch/sh/kernel/machvec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/machvec.c
   4  *
   5  * The SuperH machine vector setup handlers, yanked from setup.c
   6  *
   7  *  Copyright (C) 1999  Niibe Yutaka
   8  *  Copyright (C) 2002 - 2007 Paul Mundt
   9  */
  10 #include <linux/init.h>
  11 #include <linux/string.h>
  12 #include <asm/machvec.h>
  13 #include <asm/sections.h>
  14 #include <asm/addrspace.h>
  15 #include <asm/setup.h>
  16 #include <asm/io.h>
  17 #include <asm/irq.h>
  18
  19 #define MV_NAME_SIZE 32
  20
  21 #define for_each_mv(mv) \
  22         for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
  23              (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
  24              (mv)++)
  25
  26 static struct sh_machine_vector * __init get_mv_byname(const char *name)
  27 {
  28         struct sh_machine_vector *mv;
  29
  30         for_each_mv(mv)
  31                 if (strcasecmp(name, mv->mv_name) == 0)
  32                         return mv;
  33
  34         return NULL;
  35 }
  36
  37 static unsigned int __initdata machvec_selected;
  38
  39 static int __init early_parse_mv(char *from)
  40 {
  41         char mv_name[MV_NAME_SIZE] = "";
  42         char *mv_end;
  43         char *mv_comma;
  44         int mv_len;
  45         struct sh_machine_vector *mvp;
  46
  47         mv_end = strchr(from, ' ');
  48         if (mv_end == NULL)
  49                 mv_end = from + strlen(from);
  50
  51         mv_comma = strchr(from, ',');
  52         mv_len = mv_end - from;
  53         if (mv_len > (MV_NAME_SIZE-1))
  54                 mv_len = MV_NAME_SIZE-1;
  55         memcpy(mv_name, from, mv_len);
  56         mv_name[mv_len] = '\0';
  57         from = mv_end;
  58
  59         machvec_selected = 1;
  60
  61         /* Boot with the generic vector */
  62         if (strcmp(mv_name, "generic") == 0)
  63                 return 0;
  64
  65         mvp = get_mv_byname(mv_name);
  66         if (unlikely(!mvp)) {
  67                 printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
  68                 for_each_mv(mvp)
  69                         printk("'%s', ", mvp->mv_name);
  70                 printk("\n\n");
  71                 panic("Failed to select machvec '%s' -- halting.\n",
  72                       mv_name);
  73         } else
  74                 sh_mv = *mvp;
  75
  76         return 0;
  77 }
  78 early_param("sh_mv", early_parse_mv);
  79
  80 void __init sh_mv_setup(void)
  81 {
  82         /*
  83          * Only overload the machvec if one hasn't been selected on
  84          * the command line with sh_mv=
  85          */
  86         if (!machvec_selected) {
  87                 unsigned long machvec_size;
  88
  89                 machvec_size = ((unsigned long)&__machvec_end -
  90                                 (unsigned long)&__machvec_start);
  91
  92                 /*
  93                  * Sanity check for machvec section alignment. Ensure
  94                  * __initmv hasn't been misused.
  95                  */
  96                 if (machvec_size % sizeof(struct sh_machine_vector))
  97                         panic("machvec misaligned, invalid __initmv use?");
  98
  99                 /*
 100                  * If the machvec hasn't been preselected, use the first
 101                  * vector (usually the only one) from .machvec.init.
 102                  */
 103                 if (machvec_size >= sizeof(struct sh_machine_vector))
 104                         sh_mv = *(struct sh_machine_vector *)&__machvec_start;
 105         }
 106
 107         printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
 108
 109         /*
 110          * Manually walk the vec, fill in anything that the board hasn't yet
 111          * by hand, wrapping to the generic implementation.
 112          */
 113 #define mv_set(elem) do { \
 114         if (!sh_mv.mv_##elem) \
 115                 sh_mv.mv_##elem = generic_##elem; \
 116 } while (0)
 117
 118         mv_set(irq_demux);
 119         mv_set(mode_pins);
 120         mv_set(mem_init);
 121 }