123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/kernel/machvec.c
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*
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* The SuperH machine vector setup handlers, yanked from setup.c
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 - 2007 Paul Mundt
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*/
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#include <linux/init.h>
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#include <linux/string.h>
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#include <asm/machvec.h>
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#include <asm/sections.h>
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#include <asm/addrspace.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/processor.h>
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#define MV_NAME_SIZE 32
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#define for_each_mv(mv) \
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for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
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(mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
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(mv)++)
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static struct sh_machine_vector * __init get_mv_byname(const char *name)
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{
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struct sh_machine_vector *mv;
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for_each_mv(mv)
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if (strcasecmp(name, mv->mv_name) == 0)
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return mv;
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return NULL;
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}
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static unsigned int __initdata machvec_selected;
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static int __init early_parse_mv(char *from)
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{
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char mv_name[MV_NAME_SIZE] = "";
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char *mv_end;
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char *mv_comma;
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int mv_len;
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struct sh_machine_vector *mvp;
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mv_end = strchr(from, ' ');
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if (mv_end == NULL)
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mv_end = from + strlen(from);
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mv_comma = strchr(from, ',');
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mv_len = mv_end - from;
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if (mv_len > (MV_NAME_SIZE-1))
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mv_len = MV_NAME_SIZE-1;
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memcpy(mv_name, from, mv_len);
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mv_name[mv_len] = '\0';
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from = mv_end;
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machvec_selected = 1;
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/* Boot with the generic vector */
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if (strcmp(mv_name, "generic") == 0)
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return 0;
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mvp = get_mv_byname(mv_name);
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if (unlikely(!mvp)) {
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pr_info("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
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for_each_mv(mvp)
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pr_cont("'%s', ", mvp->mv_name);
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pr_cont("\n\n");
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panic("Failed to select machvec '%s' -- halting.\n",
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mv_name);
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} else
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sh_mv = *mvp;
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return 0;
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}
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early_param("sh_mv", early_parse_mv);
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void __init sh_mv_setup(void)
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{
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/*
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* Only overload the machvec if one hasn't been selected on
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* the command line with sh_mv=
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*/
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if (!machvec_selected) {
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unsigned long machvec_size;
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machvec_size = ((unsigned long)&__machvec_end -
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(unsigned long)&__machvec_start);
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/*
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* Sanity check for machvec section alignment. Ensure
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* __initmv hasn't been misused.
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*/
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if (machvec_size % sizeof(struct sh_machine_vector))
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panic("machvec misaligned, invalid __initmv use?");
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/*
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* If the machvec hasn't been preselected, use the first
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* vector (usually the only one) from .machvec.init.
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*/
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if (machvec_size >= sizeof(struct sh_machine_vector))
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sh_mv = *(struct sh_machine_vector *)&__machvec_start;
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}
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pr_notice("Booting machvec: %s\n", get_system_type());
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/*
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* Manually walk the vec, fill in anything that the board hasn't yet
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* by hand, wrapping to the generic implementation.
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*/
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#define mv_set(elem) do { \
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if (!sh_mv.mv_##elem) \
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sh_mv.mv_##elem = generic_##elem; \
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} while (0)
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mv_set(irq_demux);
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mv_set(mode_pins);
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mv_set(mem_init);
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}
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