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