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 partitions[] = 53 { 54 { 55 .name = "FileSystem", 56 .size = 0x800000, 57 .offset = 0x00000000 58 }, 59 }; 60 61 static int __init init_impa7(void) 62 { 63 static const char *rom_probe_types[] = PROBETYPES; 64 const char **type; 65 int i; 66 static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = { 67 { WINDOW_ADDR0, WINDOW_SIZE0 }, 68 { WINDOW_ADDR1, WINDOW_SIZE1 }, 69 }; 70 int devicesfound = 0; 71 72 for(i=0; i<NUM_FLASHBANKS; i++) 73 { 74 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n", 75 pt[i].size, pt[i].addr); 76 77 impa7_map[i].phys = pt[i].addr; 78 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size); 79 if (!impa7_map[i].virt) { 80 printk(MSG_PREFIX "failed to ioremap\n"); 81 return -EIO; 82 } 83 simple_map_init(&impa7_map[i]); 84 85 impa7_mtd[i] = 0; 86 type = rom_probe_types; 87 for(; !impa7_mtd[i] && *type; type++) { 88 impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]); 89 } 90 91 if (impa7_mtd[i]) { 92 impa7_mtd[i]->owner = THIS_MODULE; 93 devicesfound++; 94 mtd_device_parse_register(impa7_mtd[i], NULL, NULL, 95 partitions, 96 ARRAY_SIZE(partitions)); 97 } 98 else 99 iounmap((void *)impa7_map[i].virt); 100 } 101 return devicesfound == 0 ? -ENXIO : 0; 102 } 103 104 static void __exit cleanup_impa7(void) 105 { 106 int i; 107 for (i=0; i<NUM_FLASHBANKS; i++) { 108 if (impa7_mtd[i]) { 109 mtd_device_unregister(impa7_mtd[i]); 110 map_destroy(impa7_mtd[i]); 111 iounmap((void *)impa7_map[i].virt); 112 impa7_map[i].virt = 0; 113 } 114 } 115 } 116 117 module_init(init_impa7); 118 module_exit(cleanup_impa7); 119 120 MODULE_LICENSE("GPL"); 121 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>"); 122 MODULE_DESCRIPTION("MTD map driver for implementa impA7"); 123