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/setup.h>
  18 #include <asm/io.h>
  19 #include <asm/irq.h>
  20
  21 #define MV_NAME_SIZE 32
  22
  23 #define for_each_mv(mv) \
  24         for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
  25              (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
  26              (mv)++)
  27
  28 static struct sh_machine_vector * __init get_mv_byname(const char *name)
  29 {
  30         struct sh_machine_vector *mv;
  31
  32         for_each_mv(mv)
  33                 if (strcasecmp(name, mv->mv_name) == 0)
  34                         return mv;
  35
  36         return NULL;
  37 }
  38
  39 static unsigned int __initdata machvec_selected;
  40
  41 static int __init early_parse_mv(char *from)
  42 {
  43         char mv_name[MV_NAME_SIZE] = "";
  44         char *mv_end;
  45         char *mv_comma;
  46         int mv_len;
  47         struct sh_machine_vector *mvp;
  48
  49         mv_end = strchr(from, ' ');
  50         if (mv_end == NULL)
  51                 mv_end = from + strlen(from);
  52
  53         mv_comma = strchr(from, ',');
  54         mv_len = mv_end - from;
  55         if (mv_len > (MV_NAME_SIZE-1))
  56                 mv_len = MV_NAME_SIZE-1;
  57         memcpy(mv_name, from, mv_len);
  58         mv_name[mv_len] = '\0';
  59         from = mv_end;
  60
  61         machvec_selected = 1;
  62
  63         /* Boot with the generic vector */
  64         if (strcmp(mv_name, "generic") == 0)
  65                 return 0;
  66
  67         mvp = get_mv_byname(mv_name);
  68         if (unlikely(!mvp)) {
  69                 printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
  70                 for_each_mv(mvp)
  71                         printk("'%s', ", mvp->mv_name);
  72                 printk("\n\n");
  73                 panic("Failed to select machvec '%s' -- halting.\n",
  74                       mv_name);
  75         } else
  76                 sh_mv = *mvp;
  77
  78         return 0;
  79 }
  80 early_param("sh_mv", early_parse_mv);
  81
  82 void __init sh_mv_setup(void)
  83 {
  84         /*
  85          * Only overload the machvec if one hasn't been selected on
  86          * the command line with sh_mv=
  87          */
  88         if (!machvec_selected) {
  89                 unsigned long machvec_size;
  90
  91                 machvec_size = ((unsigned long)&__machvec_end -
  92                                 (unsigned long)&__machvec_start);
  93
  94                 /*
  95                  * Sanity check for machvec section alignment. Ensure
  96                  * __initmv hasn't been misused.
  97                  */
  98                 if (machvec_size % sizeof(struct sh_machine_vector))
  99                         panic("machvec misaligned, invalid __initmv use?");
 100
 101                 /*
 102                  * If the machvec hasn't been preselected, use the first
 103                  * vector (usually the only one) from .machvec.init.
 104                  */
 105                 if (machvec_size >= sizeof(struct sh_machine_vector))
 106                         sh_mv = *(struct sh_machine_vector *)&__machvec_start;
 107         }
 108
 109         printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
 110
 111         /*
 112          * Manually walk the vec, fill in anything that the board hasn't yet
 113          * by hand, wrapping to the generic implementation.
 114          */
 115 #define mv_set(elem) do { \
 116         if (!sh_mv.mv_##elem) \
 117                 sh_mv.mv_##elem = generic_##elem; \
 118 } while (0)
 119
 120         mv_set(inb);    mv_set(inw);    mv_set(inl);
 121         mv_set(outb);   mv_set(outw);   mv_set(outl);
 122
 123         mv_set(inb_p);  mv_set(inw_p);  mv_set(inl_p);
 124         mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
 125
 126         mv_set(insb);   mv_set(insw);   mv_set(insl);
 127         mv_set(outsb);  mv_set(outsw);  mv_set(outsl);
 128
 129         mv_set(ioport_map);
 130         mv_set(ioport_unmap);
 131         mv_set(irq_demux);
 132
 133         if (!sh_mv.mv_nr_irqs)
 134                 sh_mv.mv_nr_irqs = NR_IRQS;
 135 }