drivers/mtd/maps/impa7.c

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