Linux Kernel  3.7.1
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machvec.c
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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/addrspace.h>
18 #include <asm/setup.h>
19 #include <asm/io.h>
20 #include <asm/irq.h>
21 
22 #define MV_NAME_SIZE 32
23 
24 #define for_each_mv(mv) \
25  for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
26  (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
27  (mv)++)
28 
29 static struct sh_machine_vector * __init get_mv_byname(const char *name)
30 {
31  struct sh_machine_vector *mv;
32 
33  for_each_mv(mv)
34  if (strcasecmp(name, mv->mv_name) == 0)
35  return mv;
36 
37  return NULL;
38 }
39 
40 static unsigned int __initdata machvec_selected;
41 
42 static int __init early_parse_mv(char *from)
43 {
44  char mv_name[MV_NAME_SIZE] = "";
45  char *mv_end;
46  char *mv_comma;
47  int mv_len;
48  struct sh_machine_vector *mvp;
49 
50  mv_end = strchr(from, ' ');
51  if (mv_end == NULL)
52  mv_end = from + strlen(from);
53 
54  mv_comma = strchr(from, ',');
55  mv_len = mv_end - from;
56  if (mv_len > (MV_NAME_SIZE-1))
57  mv_len = MV_NAME_SIZE-1;
58  memcpy(mv_name, from, mv_len);
59  mv_name[mv_len] = '\0';
60  from = mv_end;
61 
62  machvec_selected = 1;
63 
64  /* Boot with the generic vector */
65  if (strcmp(mv_name, "generic") == 0)
66  return 0;
67 
68  mvp = get_mv_byname(mv_name);
69  if (unlikely(!mvp)) {
70  printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
71  for_each_mv(mvp)
72  printk("'%s', ", mvp->mv_name);
73  printk("\n\n");
74  panic("Failed to select machvec '%s' -- halting.\n",
75  mv_name);
76  } else
77  sh_mv = *mvp;
78 
79  return 0;
80 }
81 early_param("sh_mv", early_parse_mv);
82 
83 void __init sh_mv_setup(void)
84 {
85  /*
86  * Only overload the machvec if one hasn't been selected on
87  * the command line with sh_mv=
88  */
89  if (!machvec_selected) {
90  unsigned long machvec_size;
91 
92  machvec_size = ((unsigned long)&__machvec_end -
93  (unsigned long)&__machvec_start);
94 
95  /*
96  * Sanity check for machvec section alignment. Ensure
97  * __initmv hasn't been misused.
98  */
99  if (machvec_size % sizeof(struct sh_machine_vector))
100  panic("machvec misaligned, invalid __initmv use?");
101 
102  /*
103  * If the machvec hasn't been preselected, use the first
104  * vector (usually the only one) from .machvec.init.
105  */
106  if (machvec_size >= sizeof(struct sh_machine_vector))
107  sh_mv = *(struct sh_machine_vector *)&__machvec_start;
108  }
109 
110  printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
111 
112  /*
113  * Manually walk the vec, fill in anything that the board hasn't yet
114  * by hand, wrapping to the generic implementation.
115  */
116 #define mv_set(elem) do { \
117  if (!sh_mv.mv_##elem) \
118  sh_mv.mv_##elem = generic_##elem; \
119 } while (0)
120 
121  mv_set(irq_demux);
122  mv_set(mode_pins);
123  mv_set(mem_init);
124 }
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