1 /* 2 * $Id: impa7.c,v 1.14 2005/11/07 11:14:27 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 21 #ifdef CONFIG_MTD_PARTITIONS 22 #include <linux/mtd/partitions.h> 23 #endif 24 25 #define WINDOW_ADDR0 0x00000000 /* physical properties of flash */ 26 #define WINDOW_SIZE0 0x00800000 27 #define WINDOW_ADDR1 0x10000000 /* physical properties of flash */ 28 #define WINDOW_SIZE1 0x00800000 29 #define NUM_FLASHBANKS 2 30 #define BUSWIDTH 4 31 32 /* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */ 33 #define PROBETYPES { "jedec_probe", NULL } 34 35 #define MSG_PREFIX "impA7:" /* prefix for our printk()'s */ 36 #define MTDID "impa7-%d" /* for mtdparts= partitioning */ 37 38 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS]; 39 40 41 static struct map_info impa7_map[NUM_FLASHBANKS] = { 42 { 43 .name = "impA7 NOR Flash Bank #0", 44 .size = WINDOW_SIZE0, 45 .bankwidth = BUSWIDTH, 46 }, 47 { 48 .name = "impA7 NOR Flash Bank #1", 49 .size = WINDOW_SIZE1, 50 .bankwidth = BUSWIDTH, 51 }, 52 }; 53 54 #ifdef CONFIG_MTD_PARTITIONS 55 56 /* 57 * MTD partitioning stuff 58 */ 59 static struct mtd_partition static_partitions[] = 60 { 61 { 62 .name = "FileSystem", 63 .size = 0x800000, 64 .offset = 0x00000000 65 }, 66 }; 67 68 static int mtd_parts_nb[NUM_FLASHBANKS]; 69 static struct mtd_partition *mtd_parts[NUM_FLASHBANKS]; 70 71 #endif 72 73 static const char *probes[] = { "cmdlinepart", NULL }; 74 75 int __init init_impa7(void) 76 { 77 static const char *rom_probe_types[] = PROBETYPES; 78 const char **type; 79 const char *part_type = 0; 80 int i; 81 static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = { 82 { WINDOW_ADDR0, WINDOW_SIZE0 }, 83 { WINDOW_ADDR1, WINDOW_SIZE1 }, 84 }; 85 int devicesfound = 0; 86 87 for(i=0; i<NUM_FLASHBANKS; i++) 88 { 89 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n", 90 pt[i].size, pt[i].addr); 91 92 impa7_map[i].phys = pt[i].addr; 93 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size); 94 if (!impa7_map[i].virt) { 95 printk(MSG_PREFIX "failed to ioremap\n"); 96 return -EIO; 97 } 98 simple_map_init(&impa7_map[i]); 99 100 impa7_mtd[i] = 0; 101 type = rom_probe_types; 102 for(; !impa7_mtd[i] && *type; type++) { 103 impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]); 104 } 105 106 if (impa7_mtd[i]) { 107 impa7_mtd[i]->owner = THIS_MODULE; 108 devicesfound++; 109 #ifdef CONFIG_MTD_PARTITIONS 110 mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i], 111 probes, 112 &mtd_parts[i], 113 0); 114 if (mtd_parts_nb[i] > 0) { 115 part_type = "command line"; 116 } else { 117 mtd_parts[i] = static_partitions; 118 mtd_parts_nb[i] = ARRAY_SIZE(static_partitions); 119 part_type = "static"; 120 } 121 122 printk(KERN_NOTICE MSG_PREFIX 123 "using %s partition definition\n", 124 part_type); 125 add_mtd_partitions(impa7_mtd[i], 126 mtd_parts[i], mtd_parts_nb[i]); 127 #else 128 add_mtd_device(impa7_mtd[i]); 129 130 #endif 131 } 132 else 133 iounmap((void *)impa7_map[i].virt); 134 } 135 return devicesfound == 0 ? -ENXIO : 0; 136 } 137 138 static void __exit cleanup_impa7(void) 139 { 140 int i; 141 for (i=0; i<NUM_FLASHBANKS; i++) { 142 if (impa7_mtd[i]) { 143 #ifdef CONFIG_MTD_PARTITIONS 144 del_mtd_partitions(impa7_mtd[i]); 145 #else 146 del_mtd_device(impa7_mtd[i]); 147 #endif 148 map_destroy(impa7_mtd[i]); 149 iounmap((void *)impa7_map[i].virt); 150 impa7_map[i].virt = 0; 151 } 152 } 153 } 154 155 module_init(init_impa7); 156 module_exit(cleanup_impa7); 157 158 MODULE_LICENSE("GPL"); 159 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>"); 160 MODULE_DESCRIPTION("MTD map driver for implementa impA7"); 161