1 /* 2 * $Id: impa7.c,v 1.13 2004/11/04 13:24:14 gleixner Exp $ 3 * 4 * Handle mapping of the NOR flash on implementa A7 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 #include <linux/config.h> 21 22 #ifdef CONFIG_MTD_PARTITIONS 23 #include <linux/mtd/partitions.h> 24 #endif 25 26 #define WINDOW_ADDR0 0x00000000 /* physical properties of flash */ 27 #define WINDOW_SIZE0 0x00800000 28 #define WINDOW_ADDR1 0x10000000 /* physical properties of flash */ 29 #define WINDOW_SIZE1 0x00800000 30 #define NUM_FLASHBANKS 2 31 #define BUSWIDTH 4 32 33 /* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */ 34 #define PROBETYPES { "jedec_probe", NULL } 35 36 #define MSG_PREFIX "impA7:" /* prefix for our printk()'s */ 37 #define MTDID "impa7-%d" /* for mtdparts= partitioning */ 38 39 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS]; 40 41 42 static struct map_info impa7_map[NUM_FLASHBANKS] = { 43 { 44 .name = "impA7 NOR Flash Bank #0", 45 .size = WINDOW_SIZE0, 46 .bankwidth = BUSWIDTH, 47 }, 48 { 49 .name = "impA7 NOR Flash Bank #1", 50 .size = WINDOW_SIZE1, 51 .bankwidth = BUSWIDTH, 52 }, 53 }; 54 55 #ifdef CONFIG_MTD_PARTITIONS 56 57 /* 58 * MTD partitioning stuff 59 */ 60 static struct mtd_partition static_partitions[] = 61 { 62 { 63 .name = "FileSystem", 64 .size = 0x800000, 65 .offset = 0x00000000 66 }, 67 }; 68 69 static int mtd_parts_nb[NUM_FLASHBANKS]; 70 static struct mtd_partition *mtd_parts[NUM_FLASHBANKS]; 71 72 #endif 73 74 static const char *probes[] = { "cmdlinepart", NULL }; 75 76 int __init init_impa7(void) 77 { 78 static const char *rom_probe_types[] = PROBETYPES; 79 const char **type; 80 const char *part_type = 0; 81 int i; 82 static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = { 83 { WINDOW_ADDR0, WINDOW_SIZE0 }, 84 { WINDOW_ADDR1, WINDOW_SIZE1 }, 85 }; 86 int devicesfound = 0; 87 88 for(i=0; i<NUM_FLASHBANKS; i++) 89 { 90 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n", 91 pt[i].size, pt[i].addr); 92 93 impa7_map[i].phys = pt[i].addr; 94 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size); 95 if (!impa7_map[i].virt) { 96 printk(MSG_PREFIX "failed to ioremap\n"); 97 return -EIO; 98 } 99 simple_map_init(&impa7_map[i]); 100 101 impa7_mtd[i] = 0; 102 type = rom_probe_types; 103 for(; !impa7_mtd[i] && *type; type++) { 104 impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]); 105 } 106 107 if (impa7_mtd[i]) { 108 impa7_mtd[i]->owner = THIS_MODULE; 109 devicesfound++; 110 #ifdef CONFIG_MTD_PARTITIONS 111 mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i], 112 probes, 113 &mtd_parts[i], 114 0); 115 if (mtd_parts_nb[i] > 0) { 116 part_type = "command line"; 117 } else { 118 mtd_parts[i] = static_partitions; 119 mtd_parts_nb[i] = ARRAY_SIZE(static_partitions); 120 part_type = "static"; 121 } 122 123 printk(KERN_NOTICE MSG_PREFIX 124 "using %s partition definition\n", 125 part_type); 126 add_mtd_partitions(impa7_mtd[i], 127 mtd_parts[i], mtd_parts_nb[i]); 128 #else 129 add_mtd_device(impa7_mtd[i]); 130 131 #endif 132 } 133 else 134 iounmap((void *)impa7_map[i].virt); 135 } 136 return devicesfound == 0 ? -ENXIO : 0; 137 } 138 139 static void __exit cleanup_impa7(void) 140 { 141 int i; 142 for (i=0; i<NUM_FLASHBANKS; i++) { 143 if (impa7_mtd[i]) { 144 #ifdef CONFIG_MTD_PARTITIONS 145 del_mtd_partitions(impa7_mtd[i]); 146 #else 147 del_mtd_device(impa7_mtd[i]); 148 #endif 149 map_destroy(impa7_mtd[i]); 150 iounmap((void *)impa7_map[i].virt); 151 impa7_map[i].virt = 0; 152 } 153 } 154 } 155 156 module_init(init_impa7); 157 module_exit(cleanup_impa7); 158 159 MODULE_LICENSE("GPL"); 160 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>"); 161 MODULE_DESCRIPTION("MTD map driver for implementa impA7"); 162