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