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