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