arch/sh/kernel/machvec.c

   1 /*
   2  * arch/sh/kernel/machvec.c
   3  *
   4  * The SuperH machine vector setup handlers, yanked from setup.c
   5  *
   6  *  Copyright (C) 1999  Niibe Yutaka
   7  *  Copyright (C) 2002 - 2007 Paul Mundt
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/string.h>
  15 #include <asm/machvec.h>
  16 #include <asm/sections.h>
  17 #include <asm/addrspace.h>
  18 #include <asm/setup.h>
  19 #include <asm/io.h>
  20 #include <asm/irq.h>
  21
  22 #define MV_NAME_SIZE 32
  23
  24 #define for_each_mv(mv) \
  25         for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
  26              (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
  27              (mv)++)
  28
  29 static struct sh_machine_vector * __init get_mv_byname(const char *name)
  30 {
  31         struct sh_machine_vector *mv;
  32
  33         for_each_mv(mv)
  34                 if (strcasecmp(name, mv->mv_name) == 0)
  35                         return mv;
  36
  37         return NULL;
  38 }
  39
  40 static unsigned int __initdata machvec_selected;
  41
  42 static int __init early_parse_mv(char *from)
  43 {
  44         char mv_name[MV_NAME_SIZE] = "";
  45         char *mv_end;
  46         char *mv_comma;
  47         int mv_len;
  48         struct sh_machine_vector *mvp;
  49
  50         mv_end = strchr(from, ' ');
  51         if (mv_end == NULL)
  52                 mv_end = from + strlen(from);
  53
  54         mv_comma = strchr(from, ',');
  55         mv_len = mv_end - from;
  56         if (mv_len > (MV_NAME_SIZE-1))
  57                 mv_len = MV_NAME_SIZE-1;
  58         memcpy(mv_name, from, mv_len);
  59         mv_name[mv_len] = '\0';
  60         from = mv_end;
  61
  62         machvec_selected = 1;
  63
  64         /* Boot with the generic vector */
  65         if (strcmp(mv_name, "generic") == 0)
  66                 return 0;
  67
  68         mvp = get_mv_byname(mv_name);
  69         if (unlikely(!mvp)) {
  70                 printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
  71                 for_each_mv(mvp)
  72                         printk("'%s', ", mvp->mv_name);
  73                 printk("\n\n");
  74                 panic("Failed to select machvec '%s' -- halting.\n",
  75                       mv_name);
  76         } else
  77                 sh_mv = *mvp;
  78
  79         return 0;
  80 }
  81 early_param("sh_mv", early_parse_mv);
  82
  83 void __init sh_mv_setup(void)
  84 {
  85         /*
  86          * Only overload the machvec if one hasn't been selected on
  87          * the command line with sh_mv=
  88          */
  89         if (!machvec_selected) {
  90                 unsigned long machvec_size;
  91
  92                 machvec_size = ((unsigned long)&__machvec_end -
  93                                 (unsigned long)&__machvec_start);
  94
  95                 /*
  96                  * Sanity check for machvec section alignment. Ensure
  97                  * __initmv hasn't been misused.
  98                  */
  99                 if (machvec_size % sizeof(struct sh_machine_vector))
 100                         panic("machvec misaligned, invalid __initmv use?");
 101
 102                 /*
 103                  * If the machvec hasn't been preselected, use the first
 104                  * vector (usually the only one) from .machvec.init.
 105                  */
 106                 if (machvec_size >= sizeof(struct sh_machine_vector))
 107                         sh_mv = *(struct sh_machine_vector *)&__machvec_start;
 108         }
 109
 110         printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
 111
 112         /*
 113          * Manually walk the vec, fill in anything that the board hasn't yet
 114          * by hand, wrapping to the generic implementation.
 115          */
 116 #define mv_set(elem) do { \
 117         if (!sh_mv.mv_##elem) \
 118                 sh_mv.mv_##elem = generic_##elem; \
 119 } while (0)
 120
 121         mv_set(irq_demux);
 122         mv_set(mode_pins);
 123         mv_set(mem_init);
 124
 125         if (!sh_mv.mv_nr_irqs)
 126                 sh_mv.mv_nr_irqs = NR_IRQS;
 127 }