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
get_mv_byname(const char * name)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
early_parse_mv(char * from)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
sh_mv_setup(void)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