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