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/setup.h> 18 #include <asm/io.h> 19 #include <asm/irq.h> 20 21 #define MV_NAME_SIZE 32 22 23 #define for_each_mv(mv) \ 24 for ((mv) = (struct sh_machine_vector *)&__machvec_start; \ 25 (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \ 26 (mv)++) 27 28 static struct sh_machine_vector * __init get_mv_byname(const char *name) 29 { 30 struct sh_machine_vector *mv; 31 32 for_each_mv(mv) 33 if (strcasecmp(name, mv->mv_name) == 0) 34 return mv; 35 36 return NULL; 37 } 38 39 static unsigned int __initdata machvec_selected; 40 41 static int __init early_parse_mv(char *from) 42 { 43 char mv_name[MV_NAME_SIZE] = ""; 44 char *mv_end; 45 char *mv_comma; 46 int mv_len; 47 struct sh_machine_vector *mvp; 48 49 mv_end = strchr(from, ' '); 50 if (mv_end == NULL) 51 mv_end = from + strlen(from); 52 53 mv_comma = strchr(from, ','); 54 mv_len = mv_end - from; 55 if (mv_len > (MV_NAME_SIZE-1)) 56 mv_len = MV_NAME_SIZE-1; 57 memcpy(mv_name, from, mv_len); 58 mv_name[mv_len] = '\0'; 59 from = mv_end; 60 61 machvec_selected = 1; 62 63 /* Boot with the generic vector */ 64 if (strcmp(mv_name, "generic") == 0) 65 return 0; 66 67 mvp = get_mv_byname(mv_name); 68 if (unlikely(!mvp)) { 69 printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name); 70 for_each_mv(mvp) 71 printk("'%s', ", mvp->mv_name); 72 printk("\n\n"); 73 panic("Failed to select machvec '%s' -- halting.\n", 74 mv_name); 75 } else 76 sh_mv = *mvp; 77 78 return 0; 79 } 80 early_param("sh_mv", early_parse_mv); 81 82 void __init sh_mv_setup(void) 83 { 84 /* 85 * Only overload the machvec if one hasn't been selected on 86 * the command line with sh_mv= 87 */ 88 if (!machvec_selected) { 89 unsigned long machvec_size; 90 91 machvec_size = ((unsigned long)&__machvec_end - 92 (unsigned long)&__machvec_start); 93 94 /* 95 * Sanity check for machvec section alignment. Ensure 96 * __initmv hasn't been misused. 97 */ 98 if (machvec_size % sizeof(struct sh_machine_vector)) 99 panic("machvec misaligned, invalid __initmv use?"); 100 101 /* 102 * If the machvec hasn't been preselected, use the first 103 * vector (usually the only one) from .machvec.init. 104 */ 105 if (machvec_size >= sizeof(struct sh_machine_vector)) 106 sh_mv = *(struct sh_machine_vector *)&__machvec_start; 107 } 108 109 printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type()); 110 111 /* 112 * Manually walk the vec, fill in anything that the board hasn't yet 113 * by hand, wrapping to the generic implementation. 114 */ 115 #define mv_set(elem) do { \ 116 if (!sh_mv.mv_##elem) \ 117 sh_mv.mv_##elem = generic_##elem; \ 118 } while (0) 119 120 mv_set(inb); mv_set(inw); mv_set(inl); 121 mv_set(outb); mv_set(outw); mv_set(outl); 122 123 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 124 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 125 126 mv_set(insb); mv_set(insw); mv_set(insl); 127 mv_set(outsb); mv_set(outsw); mv_set(outsl); 128 129 mv_set(ioport_map); 130 mv_set(ioport_unmap); 131 mv_set(irq_demux); 132 133 if (!sh_mv.mv_nr_irqs) 134 sh_mv.mv_nr_irqs = NR_IRQS; 135 } 136