1/* 2 * Handle mapping of the NOR flash on implementa A7 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_ADDR0 0x00000000 /* physical properties of flash */ 24#define WINDOW_SIZE0 0x00800000 25#define WINDOW_ADDR1 0x10000000 /* physical properties of flash */ 26#define WINDOW_SIZE1 0x00800000 27#define NUM_FLASHBANKS 2 28#define BUSWIDTH 4 29 30/* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */ 31#define PROBETYPES { "jedec_probe", NULL } 32 33#define MSG_PREFIX "impA7:" /* prefix for our printk()'s */ 34#define MTDID "impa7-%d" /* for mtdparts= partitioning */ 35 36static struct mtd_info *impa7_mtd[NUM_FLASHBANKS]; 37 38 39static struct map_info impa7_map[NUM_FLASHBANKS] = { 40 { 41 .name = "impA7 NOR Flash Bank #0", 42 .size = WINDOW_SIZE0, 43 .bankwidth = BUSWIDTH, 44 }, 45 { 46 .name = "impA7 NOR Flash Bank #1", 47 .size = WINDOW_SIZE1, 48 .bankwidth = BUSWIDTH, 49 }, 50}; 51 52#ifdef CONFIG_MTD_PARTITIONS 53 54/* 55 * MTD partitioning stuff 56 */ 57static struct mtd_partition static_partitions[] = 58{ 59 { 60 .name = "FileSystem", 61 .size = 0x800000, 62 .offset = 0x00000000 63 }, 64}; 65 66static int mtd_parts_nb[NUM_FLASHBANKS]; 67static struct mtd_partition *mtd_parts[NUM_FLASHBANKS]; 68 69#endif 70 71static const char *probes[] = { "cmdlinepart", NULL }; 72 73static int __init init_impa7(void) 74{ 75 static const char *rom_probe_types[] = PROBETYPES; 76 const char **type; 77 const char *part_type = 0; 78 int i; 79 static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = { 80 { WINDOW_ADDR0, WINDOW_SIZE0 }, 81 { WINDOW_ADDR1, WINDOW_SIZE1 }, 82 }; 83 int devicesfound = 0; 84 85 for(i=0; i<NUM_FLASHBANKS; i++) 86 { 87 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n", 88 pt[i].size, pt[i].addr); 89 90 impa7_map[i].phys = pt[i].addr; 91 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size); 92 if (!impa7_map[i].virt) { 93 printk(MSG_PREFIX "failed to ioremap\n"); 94 return -EIO; 95 } 96 simple_map_init(&impa7_map[i]); 97 98 impa7_mtd[i] = 0; 99 type = rom_probe_types; 100 for(; !impa7_mtd[i] && *type; type++) { 101 impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]); 102 } 103 104 if (impa7_mtd[i]) { 105 impa7_mtd[i]->owner = THIS_MODULE; 106 devicesfound++; 107#ifdef CONFIG_MTD_PARTITIONS 108 mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i], 109 probes, 110 &mtd_parts[i], 111 0); 112 if (mtd_parts_nb[i] > 0) { 113 part_type = "command line"; 114 } else { 115 mtd_parts[i] = static_partitions; 116 mtd_parts_nb[i] = ARRAY_SIZE(static_partitions); 117 part_type = "static"; 118 } 119 120 printk(KERN_NOTICE MSG_PREFIX 121 "using %s partition definition\n", 122 part_type); 123 add_mtd_partitions(impa7_mtd[i], 124 mtd_parts[i], mtd_parts_nb[i]); 125#else 126 add_mtd_device(impa7_mtd[i]); 127 128#endif 129 } 130 else 131 iounmap((void *)impa7_map[i].virt); 132 } 133 return devicesfound == 0 ? -ENXIO : 0; 134} 135 136static void __exit cleanup_impa7(void) 137{ 138 int i; 139 for (i=0; i<NUM_FLASHBANKS; i++) { 140 if (impa7_mtd[i]) { 141#ifdef CONFIG_MTD_PARTITIONS 142 del_mtd_partitions(impa7_mtd[i]); 143#else 144 del_mtd_device(impa7_mtd[i]); 145#endif 146 map_destroy(impa7_mtd[i]); 147 iounmap((void *)impa7_map[i].virt); 148 impa7_map[i].virt = 0; 149 } 150 } 151} 152 153module_init(init_impa7); 154module_exit(cleanup_impa7); 155 156MODULE_LICENSE("GPL"); 157MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>"); 158MODULE_DESCRIPTION("MTD map driver for implementa impA7"); 159