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machvec.c

/*
 * arch/sh/kernel/machvec.c
 *
 * The SuperH machine vector setup handlers, yanked from setup.c
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002 - 2007 Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/string.h>
#include <asm/machvec.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/irq.h>

#define MV_NAME_SIZE 32

#define for_each_mv(mv) \
      for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
           (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
           (mv)++)

static struct sh_machine_vector * __init get_mv_byname(const char *name)
{
      struct sh_machine_vector *mv;

      for_each_mv(mv)
            if (strcasecmp(name, mv->mv_name) == 0)
                  return mv;

      return NULL;
}

static unsigned int __initdata machvec_selected;

static int __init early_parse_mv(char *from)
{
      char mv_name[MV_NAME_SIZE] = "";
      char *mv_end;
      char *mv_comma;
      int mv_len;
      struct sh_machine_vector *mvp;

      mv_end = strchr(from, ' ');
      if (mv_end == NULL)
            mv_end = from + strlen(from);

      mv_comma = strchr(from, ',');
      mv_len = mv_end - from;
      if (mv_len > (MV_NAME_SIZE-1))
            mv_len = MV_NAME_SIZE-1;
      memcpy(mv_name, from, mv_len);
      mv_name[mv_len] = '\0';
      from = mv_end;

      machvec_selected = 1;

      /* Boot with the generic vector */
      if (strcmp(mv_name, "generic") == 0)
            return 0;

      mvp = get_mv_byname(mv_name);
      if (unlikely(!mvp)) {
            printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
            for_each_mv(mvp)
                  printk("'%s', ", mvp->mv_name);
            printk("\n\n");
            panic("Failed to select machvec '%s' -- halting.\n",
                  mv_name);
      } else
            sh_mv = *mvp;

      return 0;
}
early_param("sh_mv", early_parse_mv);

void __init sh_mv_setup(void)
{
      /*
       * Only overload the machvec if one hasn't been selected on
       * the command line with sh_mv=
       */
      if (!machvec_selected) {
            unsigned long machvec_size;

            machvec_size = ((unsigned long)&__machvec_end -
                        (unsigned long)&__machvec_start);

            /*
             * Sanity check for machvec section alignment. Ensure
             * __initmv hasn't been misused.
             */
            if (machvec_size % sizeof(struct sh_machine_vector))
                  panic("machvec misaligned, invalid __initmv use?");

            /*
             * If the machvec hasn't been preselected, use the first
             * vector (usually the only one) from .machvec.init.
             */
            if (machvec_size >= sizeof(struct sh_machine_vector))
                  sh_mv = *(struct sh_machine_vector *)&__machvec_start;
      }

      printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());

      /*
       * Manually walk the vec, fill in anything that the board hasn't yet
       * by hand, wrapping to the generic implementation.
       */
#define mv_set(elem) do { \
      if (!sh_mv.mv_##elem) \
            sh_mv.mv_##elem = generic_##elem; \
} while (0)

      mv_set(inb);      mv_set(inw);      mv_set(inl);
      mv_set(outb);     mv_set(outw);     mv_set(outl);

      mv_set(inb_p);    mv_set(inw_p);    mv_set(inl_p);
      mv_set(outb_p);   mv_set(outw_p);   mv_set(outl_p);

      mv_set(insb);     mv_set(insw);     mv_set(insl);
      mv_set(outsb);    mv_set(outsw);    mv_set(outsl);

      mv_set(readb);    mv_set(readw);    mv_set(readl);
      mv_set(writeb);   mv_set(writew);   mv_set(writel);

      mv_set(ioport_map);
      mv_set(ioport_unmap);
      mv_set(irq_demux);

      if (!sh_mv.mv_nr_irqs)
            sh_mv.mv_nr_irqs = NR_IRQS;
}

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