drivers/mtd/maps/impa7.c

   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");