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