drivers/mtd/maps/impa7.c

   1 /*
   2  * $Id: impa7.c,v 1.8 2003/05/21 12:45:18 dwmw2 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", 0 }; */
  34 #define PROBETYPES { "jedec_probe", 0 }
  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] = { 0 };
  40
  41
  42 static struct map_info impa7_map[NUM_FLASHBANKS] = {
  43         {
  44                 .name = "impA7 NOR Flash Bank #0",
  45                 .size = WINDOW_SIZE0,
  46                 .buswidth = BUSWIDTH,
  47         },
  48         {
  49                 .name = "impA7 NOR Flash Bank #1",
  50                 .size = WINDOW_SIZE1,
  51                 .buswidth = 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 #define NB_OF(x) (sizeof (x) / sizeof (x[0]))
  70
  71 #endif
  72
  73 static int                   mtd_parts_nb = 0;
  74 static struct mtd_partition *mtd_parts    = 0;
  75 static const char *probes[] = { "cmdlinepart", NULL };
  76
  77 int __init init_impa7(void)
  78 {
  79         static const char *rom_probe_types[] = PROBETYPES;
  80         const char **type;
  81         const char *part_type = 0;
  82         int i;
  83         static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
  84           { WINDOW_ADDR0, WINDOW_SIZE0 },
  85           { WINDOW_ADDR1, WINDOW_SIZE1 },
  86         };
  87         char mtdid[10];
  88         int devicesfound = 0;
  89
  90         for(i=0; i<NUM_FLASHBANKS; i++)
  91         {
  92                 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
  93                        pt[i].size, pt[i].addr);
  94
  95                 impa7_map[i].phys = pt[i].addr;
  96                 impa7_map[i].virt = (unsigned long)
  97                   ioremap(pt[i].addr, pt[i].size);
  98                 if (!impa7_map[i].virt) {
  99                         printk(MSG_PREFIX "failed to ioremap\n");
 100                         return -EIO;
 101                 }
 102                 simple_map_init(&impa7_map[i]);
 103
 104                 impa7_mtd[i] = 0;
 105                 type = rom_probe_types;
 106                 for(; !impa7_mtd[i] && *type; type++) {
 107                         impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
 108                 }
 109
 110                 if (impa7_mtd[i])
 111                 {
 112                         impa7_mtd[i]->owner = THIS_MODULE;
 113                         add_mtd_device(impa7_mtd[i]);
 114                         devicesfound++;
 115 #ifdef CONFIG_MTD_PARTITIONS
 116                         mtd_parts_nb = parse_mtd_partitions(impa7_mtd[i],
 117                                                             probes,
 118                                                             &mtd_parts,
 119                                                             0);
 120                         if (mtd_parts_nb > 0)
 121                           part_type = "command line";
 122 #endif
 123                         if (mtd_parts_nb <= 0)
 124                         {
 125                                 mtd_parts = static_partitions;
 126                                 mtd_parts_nb = NB_OF(static_partitions);
 127                                 part_type = "static";
 128                         }
 129                         if (mtd_parts_nb <= 0)
 130                         {
 131                                 printk(KERN_NOTICE MSG_PREFIX
 132                                        "no partition info available\n");
 133                         }
 134                         else
 135                         {
 136                                 printk(KERN_NOTICE MSG_PREFIX
 137                                        "using %s partition definition\n",
 138                                        part_type);
 139                                 add_mtd_partitions(impa7_mtd[i],
 140                                                    mtd_parts, mtd_parts_nb);
 141                         }
 142 #endif
 143                 }
 144                 else
 145                   iounmap((void *)impa7_map[i].virt);
 146         }
 147         return devicesfound == 0 ? -ENXIO : 0;
 148 }
 149
 150 static void __exit cleanup_impa7(void)
 151 {
 152         int i;
 153         for (i=0; i<NUM_FLASHBANKS; i++)
 154         {
 155                 if (impa7_mtd[i])
 156                 {
 157                         del_mtd_device(impa7_mtd[i]);
 158                         map_destroy(impa7_mtd[i]);
 159                 }
 160                 if (impa7_map[i].virt)
 161                 {
 162                         iounmap((void *)impa7_map[i].virt);
 163                         impa7_map[i].virt = 0;
 164                 }
 165         }
 166 }
 167
 168 module_init(init_impa7);
 169 module_exit(cleanup_impa7);
 170
 171 MODULE_LICENSE("GPL");
 172 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
 173 MODULE_DESCRIPTION("MTD map driver for implementa impA7");