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122 lines
2.8 KiB
122 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sh/kernel/machvec.c |
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* |
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* The SuperH machine vector setup handlers, yanked from setup.c |
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* |
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* Copyright (C) 1999 Niibe Yutaka |
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* Copyright (C) 2002 - 2007 Paul Mundt |
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*/ |
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#include <linux/init.h> |
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#include <linux/string.h> |
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#include <asm/machvec.h> |
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#include <asm/sections.h> |
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#include <asm/addrspace.h> |
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#include <asm/setup.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#include <asm/processor.h> |
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#define MV_NAME_SIZE 32 |
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#define for_each_mv(mv) \ |
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for ((mv) = (struct sh_machine_vector *)&__machvec_start; \ |
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(mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \ |
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(mv)++) |
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static struct sh_machine_vector * __init get_mv_byname(const char *name) |
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{ |
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struct sh_machine_vector *mv; |
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for_each_mv(mv) |
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if (strcasecmp(name, mv->mv_name) == 0) |
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return mv; |
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return NULL; |
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} |
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static unsigned int __initdata machvec_selected; |
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static int __init early_parse_mv(char *from) |
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{ |
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char mv_name[MV_NAME_SIZE] = ""; |
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char *mv_end; |
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char *mv_comma; |
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int mv_len; |
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struct sh_machine_vector *mvp; |
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mv_end = strchr(from, ' '); |
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if (mv_end == NULL) |
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mv_end = from + strlen(from); |
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mv_comma = strchr(from, ','); |
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mv_len = mv_end - from; |
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if (mv_len > (MV_NAME_SIZE-1)) |
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mv_len = MV_NAME_SIZE-1; |
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memcpy(mv_name, from, mv_len); |
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mv_name[mv_len] = '\0'; |
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from = mv_end; |
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machvec_selected = 1; |
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/* Boot with the generic vector */ |
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if (strcmp(mv_name, "generic") == 0) |
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return 0; |
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mvp = get_mv_byname(mv_name); |
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if (unlikely(!mvp)) { |
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pr_info("Available vectors:\n\n\t'%s', ", sh_mv.mv_name); |
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for_each_mv(mvp) |
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pr_cont("'%s', ", mvp->mv_name); |
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pr_cont("\n\n"); |
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panic("Failed to select machvec '%s' -- halting.\n", |
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mv_name); |
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} else |
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sh_mv = *mvp; |
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return 0; |
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} |
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early_param("sh_mv", early_parse_mv); |
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void __init sh_mv_setup(void) |
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{ |
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/* |
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* Only overload the machvec if one hasn't been selected on |
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* the command line with sh_mv= |
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*/ |
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if (!machvec_selected) { |
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unsigned long machvec_size; |
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machvec_size = ((unsigned long)&__machvec_end - |
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(unsigned long)&__machvec_start); |
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/* |
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* Sanity check for machvec section alignment. Ensure |
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* __initmv hasn't been misused. |
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*/ |
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if (machvec_size % sizeof(struct sh_machine_vector)) |
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panic("machvec misaligned, invalid __initmv use?"); |
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/* |
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* If the machvec hasn't been preselected, use the first |
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* vector (usually the only one) from .machvec.init. |
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*/ |
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if (machvec_size >= sizeof(struct sh_machine_vector)) |
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sh_mv = *(struct sh_machine_vector *)&__machvec_start; |
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} |
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pr_notice("Booting machvec: %s\n", get_system_type()); |
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/* |
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* Manually walk the vec, fill in anything that the board hasn't yet |
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* by hand, wrapping to the generic implementation. |
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*/ |
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#define mv_set(elem) do { \ |
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if (!sh_mv.mv_##elem) \ |
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sh_mv.mv_##elem = generic_##elem; \ |
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} while (0) |
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mv_set(irq_demux); |
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mv_set(mode_pins); |
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mv_set(mem_init); |
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}
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