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/arch/sh/kernel/machvec.c

https://gitlab.com/teobaluta/opw
C | 124 lines | 75 code | 20 blank | 29 comment | 15 complexity | e424b1ce0acb5b844f7c52e078965d2e MD5 | raw file
  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}