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 #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, 0,
  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");