LXR linux/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
  29static 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
  40static unsigned int __initdata machvec_selected;
  41
  42static 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}
  81early_param("sh_mv", early_parse_mv);
  82
  83void __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