xref: /openbmc/linux/arch/sh/kernel/machvec.c (revision 9ac8d3fb)
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/setup.h>
18 #include <asm/io.h>
19 #include <asm/irq.h>
20 
21 #define MV_NAME_SIZE 32
22 
23 #define for_each_mv(mv) \
24 	for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
25 	     (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
26 	     (mv)++)
27 
28 static struct sh_machine_vector * __init get_mv_byname(const char *name)
29 {
30 	struct sh_machine_vector *mv;
31 
32 	for_each_mv(mv)
33 		if (strcasecmp(name, mv->mv_name) == 0)
34 			return mv;
35 
36 	return NULL;
37 }
38 
39 static unsigned int __initdata machvec_selected;
40 
41 static int __init early_parse_mv(char *from)
42 {
43 	char mv_name[MV_NAME_SIZE] = "";
44 	char *mv_end;
45 	char *mv_comma;
46 	int mv_len;
47 	struct sh_machine_vector *mvp;
48 
49 	mv_end = strchr(from, ' ');
50 	if (mv_end == NULL)
51 		mv_end = from + strlen(from);
52 
53 	mv_comma = strchr(from, ',');
54 	mv_len = mv_end - from;
55 	if (mv_len > (MV_NAME_SIZE-1))
56 		mv_len = MV_NAME_SIZE-1;
57 	memcpy(mv_name, from, mv_len);
58 	mv_name[mv_len] = '\0';
59 	from = mv_end;
60 
61 	machvec_selected = 1;
62 
63 	/* Boot with the generic vector */
64 	if (strcmp(mv_name, "generic") == 0)
65 		return 0;
66 
67 	mvp = get_mv_byname(mv_name);
68 	if (unlikely(!mvp)) {
69 		printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
70 		for_each_mv(mvp)
71 			printk("'%s', ", mvp->mv_name);
72 		printk("\n\n");
73 		panic("Failed to select machvec '%s' -- halting.\n",
74 		      mv_name);
75 	} else
76 		sh_mv = *mvp;
77 
78 	return 0;
79 }
80 early_param("sh_mv", early_parse_mv);
81 
82 void __init sh_mv_setup(void)
83 {
84 	/*
85 	 * Only overload the machvec if one hasn't been selected on
86 	 * the command line with sh_mv=
87 	 */
88 	if (!machvec_selected) {
89 		unsigned long machvec_size;
90 
91 		machvec_size = ((unsigned long)&__machvec_end -
92 				(unsigned long)&__machvec_start);
93 
94 		/*
95 		 * Sanity check for machvec section alignment. Ensure
96 		 * __initmv hasn't been misused.
97 		 */
98 		if (machvec_size % sizeof(struct sh_machine_vector))
99 			panic("machvec misaligned, invalid __initmv use?");
100 
101 		/*
102 		 * If the machvec hasn't been preselected, use the first
103 		 * vector (usually the only one) from .machvec.init.
104 		 */
105 		if (machvec_size >= sizeof(struct sh_machine_vector))
106 			sh_mv = *(struct sh_machine_vector *)&__machvec_start;
107 	}
108 
109 	printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
110 
111 	/*
112 	 * Manually walk the vec, fill in anything that the board hasn't yet
113 	 * by hand, wrapping to the generic implementation.
114 	 */
115 #define mv_set(elem) do { \
116 	if (!sh_mv.mv_##elem) \
117 		sh_mv.mv_##elem = generic_##elem; \
118 } while (0)
119 
120 	mv_set(inb);	mv_set(inw);	mv_set(inl);
121 	mv_set(outb);	mv_set(outw);	mv_set(outl);
122 
123 	mv_set(inb_p);	mv_set(inw_p);	mv_set(inl_p);
124 	mv_set(outb_p);	mv_set(outw_p);	mv_set(outl_p);
125 
126 	mv_set(insb);	mv_set(insw);	mv_set(insl);
127 	mv_set(outsb);	mv_set(outsw);	mv_set(outsl);
128 
129 	mv_set(ioport_map);
130 	mv_set(ioport_unmap);
131 	mv_set(irq_demux);
132 
133 	if (!sh_mv.mv_nr_irqs)
134 		sh_mv.mv_nr_irqs = NR_IRQS;
135 }
136