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 #include <linux/mtd/partitions.h> 19 20 #define WINDOW_ADDR0 0x00000000 /* physical properties of flash */ 21 #define WINDOW_SIZE0 0x00800000 22 #define WINDOW_ADDR1 0x10000000 /* physical properties of flash */ 23 #define WINDOW_SIZE1 0x00800000 24 #define NUM_FLASHBANKS 2 25 #define BUSWIDTH 4 26 27 /* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */ 28 #define PROBETYPES { "jedec_probe", NULL } 29 30 #define MSG_PREFIX "impA7:" /* prefix for our printk()'s */ 31 #define MTDID "impa7-%d" /* for mtdparts= partitioning */ 32 33 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS]; 34 35 36 static struct map_info impa7_map[NUM_FLASHBANKS] = { 37 { 38 .name = "impA7 NOR Flash Bank #0", 39 .size = WINDOW_SIZE0, 40 .bankwidth = BUSWIDTH, 41 }, 42 { 43 .name = "impA7 NOR Flash Bank #1", 44 .size = WINDOW_SIZE1, 45 .bankwidth = BUSWIDTH, 46 }, 47 }; 48 49 /* 50 * MTD partitioning stuff 51 */ 52 static struct mtd_partition static_partitions[] = 53 { 54 { 55 .name = "FileSystem", 56 .size = 0x800000, 57 .offset = 0x00000000 58 }, 59 }; 60 61 static int mtd_parts_nb[NUM_FLASHBANKS]; 62 static struct mtd_partition *mtd_parts[NUM_FLASHBANKS]; 63 64 65 static int __init init_impa7(void) 66 { 67 static const char *rom_probe_types[] = PROBETYPES; 68 const char **type; 69 const char *part_type = 0; 70 int i; 71 static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = { 72 { WINDOW_ADDR0, WINDOW_SIZE0 }, 73 { WINDOW_ADDR1, WINDOW_SIZE1 }, 74 }; 75 int devicesfound = 0; 76 77 for(i=0; i<NUM_FLASHBANKS; i++) 78 { 79 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n", 80 pt[i].size, pt[i].addr); 81 82 impa7_map[i].phys = pt[i].addr; 83 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size); 84 if (!impa7_map[i].virt) { 85 printk(MSG_PREFIX "failed to ioremap\n"); 86 return -EIO; 87 } 88 simple_map_init(&impa7_map[i]); 89 90 impa7_mtd[i] = 0; 91 type = rom_probe_types; 92 for(; !impa7_mtd[i] && *type; type++) { 93 impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]); 94 } 95 96 if (impa7_mtd[i]) { 97 impa7_mtd[i]->owner = THIS_MODULE; 98 devicesfound++; 99 mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i], 100 NULL, 101 &mtd_parts[i], 102 0); 103 if (mtd_parts_nb[i] > 0) { 104 part_type = "command line"; 105 } else { 106 mtd_parts[i] = static_partitions; 107 mtd_parts_nb[i] = ARRAY_SIZE(static_partitions); 108 part_type = "static"; 109 } 110 111 printk(KERN_NOTICE MSG_PREFIX 112 "using %s partition definition\n", 113 part_type); 114 mtd_device_register(impa7_mtd[i], 115 mtd_parts[i], mtd_parts_nb[i]); 116 } 117 else 118 iounmap((void *)impa7_map[i].virt); 119 } 120 return devicesfound == 0 ? -ENXIO : 0; 121 } 122 123 static void __exit cleanup_impa7(void) 124 { 125 int i; 126 for (i=0; i<NUM_FLASHBANKS; i++) { 127 if (impa7_mtd[i]) { 128 mtd_device_unregister(impa7_mtd[i]); 129 map_destroy(impa7_mtd[i]); 130 iounmap((void *)impa7_map[i].virt); 131 impa7_map[i].virt = 0; 132 } 133 } 134 } 135 136 module_init(init_impa7); 137 module_exit(cleanup_impa7); 138 139 MODULE_LICENSE("GPL"); 140 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>"); 141 MODULE_DESCRIPTION("MTD map driver for implementa impA7"); 142