1/* 2 * $Id: edb7312.c,v 1.1.1.1 2007/08/03 18:52:43 Exp $ 3 * 4 * Handle mapping of the NOR flash on Cogent EDB7312 boards 5 * 6 * Copyright 2002 SYSGO Real-Time Solutions GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/module.h> 14#include <linux/types.h> 15#include <linux/kernel.h> 16#include <linux/init.h> 17#include <asm/io.h> 18#include <linux/mtd/mtd.h> 19#include <linux/mtd/map.h> 20 21#ifdef CONFIG_MTD_PARTITIONS 22#include <linux/mtd/partitions.h> 23#endif 24 25#define WINDOW_ADDR 0x00000000 /* physical properties of flash */ 26#define WINDOW_SIZE 0x01000000 27#define BUSWIDTH 2 28#define FLASH_BLOCKSIZE_MAIN 0x20000 29#define FLASH_NUMBLOCKS_MAIN 128 30/* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */ 31#define PROBETYPES { "cfi_probe", NULL } 32 33#define MSG_PREFIX "EDB7312-NOR:" /* prefix for our printk()'s */ 34#define MTDID "edb7312-nor" /* for mtdparts= partitioning */ 35 36static struct mtd_info *mymtd; 37 38struct map_info edb7312nor_map = { 39 .name = "NOR flash on EDB7312", 40 .size = WINDOW_SIZE, 41 .bankwidth = BUSWIDTH, 42 .phys = WINDOW_ADDR, 43}; 44 45#ifdef CONFIG_MTD_PARTITIONS 46 47/* 48 * MTD partitioning stuff 49 */ 50static struct mtd_partition static_partitions[3] = 51{ 52 { 53 .name = "ARMboot", 54 .size = 0x40000, 55 .offset = 0 56 }, 57 { 58 .name = "Kernel", 59 .size = 0x200000, 60 .offset = 0x40000 61 }, 62 { 63 .name = "RootFS", 64 .size = 0xDC0000, 65 .offset = 0x240000 66 }, 67}; 68 69static const char *probes[] = { "RedBoot", "cmdlinepart", NULL }; 70 71#endif 72 73static int mtd_parts_nb = 0; 74static struct mtd_partition *mtd_parts = 0; 75 76int __init init_edb7312nor(void) 77{ 78 static const char *rom_probe_types[] = PROBETYPES; 79 const char **type; 80 const char *part_type = 0; 81 82 printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n", 83 WINDOW_SIZE, WINDOW_ADDR); 84 edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE); 85 86 if (!edb7312nor_map.virt) { 87 printk(MSG_PREFIX "failed to ioremap\n"); 88 return -EIO; 89 } 90 91 simple_map_init(&edb7312nor_map); 92 93 mymtd = 0; 94 type = rom_probe_types; 95 for(; !mymtd && *type; type++) { 96 mymtd = do_map_probe(*type, &edb7312nor_map); 97 } 98 if (mymtd) { 99 mymtd->owner = THIS_MODULE; 100 101#ifdef CONFIG_MTD_PARTITIONS 102 mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID); 103 if (mtd_parts_nb > 0) 104 part_type = "detected"; 105 106 if (mtd_parts_nb == 0) 107 { 108 mtd_parts = static_partitions; 109 mtd_parts_nb = ARRAY_SIZE(static_partitions); 110 part_type = "static"; 111 } 112#endif 113 add_mtd_device(mymtd); 114 if (mtd_parts_nb == 0) 115 printk(KERN_NOTICE MSG_PREFIX "no partition info available\n"); 116 else 117 { 118 printk(KERN_NOTICE MSG_PREFIX 119 "using %s partition definition\n", part_type); 120 add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb); 121 } 122 return 0; 123 } 124 125 iounmap((void *)edb7312nor_map.virt); 126 return -ENXIO; 127} 128 129static void __exit cleanup_edb7312nor(void) 130{ 131 if (mymtd) { 132 del_mtd_device(mymtd); 133 map_destroy(mymtd); 134 } 135 if (edb7312nor_map.virt) { 136 iounmap((void *)edb7312nor_map.virt); 137 edb7312nor_map.virt = 0; 138 } 139} 140 141module_init(init_edb7312nor); 142module_exit(cleanup_edb7312nor); 143 144MODULE_LICENSE("GPL"); 145MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>"); 146MODULE_DESCRIPTION("Generic configurable MTD map driver"); 147