| 1 | |
| 2 | |
| 3 | * arch/sh/kernel/machvec.c
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| 4 | *
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| 5 | * The SuperH machine vector setup handlers, yanked from setup.c
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| 6 | *
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| 7 | * Copyright (C) 1999 Niibe Yutaka
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| 8 | * Copyright (C) 2002 - 2007 Paul Mundt
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| 9 |
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| 10 | #include <linux/init.h>
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| 11 | #include <linux/string.h>
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| 12 | #include <asm/machvec.h>
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| 13 | #include <asm/sections.h>
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| 14 | #include <asm/addrspace.h>
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| 15 | #include <asm/setup.h>
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| 16 | #include <asm/io.h>
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| 17 | #include <asm/irq.h>
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| 18 | #include <asm/processor.h>
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| 19 |
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| 20 | #define MV_NAME_SIZE 32
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| 21 |
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| 22 | #define for_each_mv(mv) \
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| 23 | for ((mv) = (struct sh_machine_vector *)__machvec_start; \
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| 24 | (mv) && (unsigned long)(mv) < (unsigned long)__machvec_end; \
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| 25 | (mv)++)
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| 26 |
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| 27 | static struct sh_machine_vector * __init get_mv_byname(const char *name)
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| 28 | {
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| 29 | struct sh_machine_vector *mv;
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| 30 |
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| 31 | for_each_mv(mv)
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| 32 | if (strcasecmp(name, mv->mv_name) == 0)
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| 33 | return mv;
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| 34 |
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| 35 | return NULL;
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| 36 | }
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| 37 |
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| 38 | static unsigned int __initdata machvec_selected;
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| 39 |
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| 40 | static int __init early_parse_mv(char *from)
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| 41 | {
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| 42 | char mv_name[MV_NAME_SIZE] = "";
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| 43 | char *mv_end;
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| 44 | char *mv_comma;
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| 45 | int mv_len;
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| 46 | struct sh_machine_vector *mvp;
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| 47 |
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| 48 | mv_end = strchr(from, ' ');
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| 49 | if (mv_end == NULL)
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| 50 | mv_end = from + strlen(from);
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| 51 |
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| 52 | mv_comma = strchr(from, ',');
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| 53 | mv_len = mv_end - from;
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| 54 | if (mv_len > (MV_NAME_SIZE-1))
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| 55 | mv_len = MV_NAME_SIZE-1;
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| 56 | memcpy(mv_name, from, mv_len);
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| 57 | mv_name[mv_len] = '\0';
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| 58 | from = mv_end;
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| 59 |
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| 60 | machvec_selected = 1;
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| 61 |
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| 62 |
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| 63 | if (strcmp(mv_name, "generic") == 0)
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| 64 | return 0;
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| 65 |
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| 66 | mvp = get_mv_byname(mv_name);
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| 67 | if (unlikely(!mvp)) {
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| 68 | pr_info("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
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| 69 | for_each_mv(mvp)
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| 70 | pr_cont("'%s', ", mvp->mv_name);
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| 71 | pr_cont("\n\n");
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| 72 | panic("Failed to select machvec '%s' -- halting.\n",
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| 73 | mv_name);
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| 74 | } else
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| 75 | sh_mv = *mvp;
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| 76 |
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| 77 | return 0;
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| 78 | }
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| 79 | early_param("sh_mv", early_parse_mv);
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| 80 |
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| 81 | void __init sh_mv_setup(void)
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| 82 | {
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| 83 | |
| 84 | * Only overload the machvec if one hasn't been selected on
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| 85 | * the command line with sh_mv=
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| 86 |
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| 87 | if (!machvec_selected) {
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| 88 | unsigned long machvec_size;
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| 89 |
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| 90 | machvec_size = ((unsigned long)__machvec_end -
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| 91 | (unsigned long)__machvec_start);
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| 92 |
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| 93 | |
| 94 | * Sanity check for machvec section alignment. Ensure
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| 95 | * __initmv hasn't been misused.
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| 96 |
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| 97 | if (machvec_size % sizeof(struct sh_machine_vector))
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| 98 | panic("machvec misaligned, invalid __initmv use?");
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| 99 |
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| 100 | |
| 101 | * If the machvec hasn't been preselected, use the first
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| 102 | * vector (usually the only one) from .machvec.init.
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| 103 |
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| 104 | if (machvec_size >= sizeof(struct sh_machine_vector))
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| 105 | sh_mv = *(struct sh_machine_vector *)__machvec_start;
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| 106 | }
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| 107 |
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| 108 | pr_notice("Booting machvec: %s\n", get_system_type());
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| 109 |
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| 110 | |
| 111 | * Manually walk the vec, fill in anything that the board hasn't yet
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| 112 | * by hand, wrapping to the generic implementation.
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| 113 |
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| 114 | #define mv_set(elem) do { \
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| 115 | if (!sh_mv.mv_##elem) \
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| 116 | sh_mv.mv_##elem = generic_##elem; \
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| 117 | } while (0)
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| 118 |
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| 119 | mv_set(irq_demux);
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| 120 | mv_set(mode_pins);
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| 121 | mv_set(mem_init);
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| 122 | }
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