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5933f6d2 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9655ad03 PM |
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 | |
9655ad03 PM |
9 | */ |
10 | #include <linux/init.h> | |
11 | #include <linux/string.h> | |
12 | #include <asm/machvec.h> | |
13 | #include <asm/sections.h> | |
d44ee12a | 14 | #include <asm/addrspace.h> |
fa43972f | 15 | #include <asm/setup.h> |
9655ad03 PM |
16 | #include <asm/io.h> |
17 | #include <asm/irq.h> | |
0cd39f46 | 18 | #include <asm/processor.h> |
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19 | |
20 | #define MV_NAME_SIZE 32 | |
21 | ||
22 | #define for_each_mv(mv) \ | |
c5783af3 KC |
23 | for ((mv) = (struct sh_machine_vector *)__machvec_start; \ |
24 | (mv) && (unsigned long)(mv) < (unsigned long)__machvec_end; \ | |
9655ad03 PM |
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) | |
82f81f47 | 32 | if (strcasecmp(name, mv->mv_name) == 0) |
9655ad03 PM |
33 | return mv; |
34 | ||
35 | return NULL; | |
36 | } | |
37 | ||
fd8f20e8 PM |
38 | static unsigned int __initdata machvec_selected; |
39 | ||
9655ad03 PM |
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 | ||
fd8f20e8 PM |
60 | machvec_selected = 1; |
61 | ||
62 | /* Boot with the generic vector */ | |
63 | if (strcmp(mv_name, "generic") == 0) | |
64 | return 0; | |
65 | ||
82f81f47 PM |
66 | mvp = get_mv_byname(mv_name); |
67 | if (unlikely(!mvp)) { | |
eac1a488 | 68 | pr_info("Available vectors:\n\n\t'%s', ", sh_mv.mv_name); |
82f81f47 | 69 | for_each_mv(mvp) |
eac1a488 GU |
70 | pr_cont("'%s', ", mvp->mv_name); |
71 | pr_cont("\n\n"); | |
82f81f47 PM |
72 | panic("Failed to select machvec '%s' -- halting.\n", |
73 | mv_name); | |
74 | } else | |
75 | sh_mv = *mvp; | |
9655ad03 | 76 | |
9655ad03 PM |
77 | return 0; |
78 | } | |
79 | early_param("sh_mv", early_parse_mv); | |
80 | ||
81 | void __init sh_mv_setup(void) | |
82 | { | |
82f81f47 PM |
83 | /* |
84 | * Only overload the machvec if one hasn't been selected on | |
85 | * the command line with sh_mv= | |
86 | */ | |
fd8f20e8 | 87 | if (!machvec_selected) { |
82f81f47 PM |
88 | unsigned long machvec_size; |
89 | ||
c5783af3 KC |
90 | machvec_size = ((unsigned long)__machvec_end - |
91 | (unsigned long)__machvec_start); | |
82f81f47 | 92 | |
5556410e PM |
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 | ||
82f81f47 PM |
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)) | |
c5783af3 | 105 | sh_mv = *(struct sh_machine_vector *)__machvec_start; |
82f81f47 PM |
106 | } |
107 | ||
eac1a488 | 108 | pr_notice("Booting machvec: %s\n", get_system_type()); |
82f81f47 | 109 | |
9655ad03 PM |
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 | ||
9655ad03 | 119 | mv_set(irq_demux); |
eb9b9b56 | 120 | mv_set(mode_pins); |
19d8f84f | 121 | mv_set(mem_init); |
9655ad03 | 122 | } |