LXR linux/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
  26static 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
  37static unsigned int __initdata machvec_selected;
  38
  39static 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}
  78early_param("sh_mv", early_parse_mv);
  79
  80void __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}
 122