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 #define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
  28 #define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
  29
  30 static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
  31
  32 static const char * const rom_probe_types[] = { "jedec_probe", NULL };
  33
  34 static struct map_info impa7_map[NUM_FLASHBANKS] = {
  35         {
  36                 .name = "impA7 NOR Flash Bank #0",
  37                 .size = WINDOW_SIZE0,
  38                 .bankwidth = BUSWIDTH,
  39         },
  40         {
  41                 .name = "impA7 NOR Flash Bank #1",
  42                 .size = WINDOW_SIZE1,
  43                 .bankwidth = BUSWIDTH,
  44         },
  45 };
  46
  47 /*
  48  * MTD partitioning stuff
  49  */
  50 static const struct mtd_partition partitions[] =
  51 {
  52         {
  53                 .name = "FileSystem",
  54                 .size = 0x800000,
  55                 .offset = 0x00000000
  56         },
  57 };
  58
  59 static int __init init_impa7(void)
  60 {
  61         const char * const *type;
  62         int i;
  63         static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
  64           { WINDOW_ADDR0, WINDOW_SIZE0 },
  65           { WINDOW_ADDR1, WINDOW_SIZE1 },
  66         };
  67         int devicesfound = 0;
  68
  69         for(i=0; i<NUM_FLASHBANKS; i++)
  70         {
  71                 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
  72                        pt[i].size, pt[i].addr);
  73
  74                 impa7_map[i].phys = pt[i].addr;
  75                 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
  76                 if (!impa7_map[i].virt) {
  77                         printk(MSG_PREFIX "failed to ioremap\n");
  78                         return -EIO;
  79                 }
  80                 simple_map_init(&impa7_map[i]);
  81
  82                 impa7_mtd[i] = NULL;
  83                 type = rom_probe_types;
  84                 for(; !impa7_mtd[i] && *type; type++) {
  85                         impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
  86                 }
  87
  88                 if (impa7_mtd[i]) {
  89                         impa7_mtd[i]->owner = THIS_MODULE;
  90                         devicesfound++;
  91                         mtd_device_parse_register(impa7_mtd[i], NULL, NULL,
  92                                                   partitions,
  93                                                   ARRAY_SIZE(partitions));
  94                 } else {
  95                         iounmap((void __iomem *)impa7_map[i].virt);
  96                 }
  97         }
  98         return devicesfound == 0 ? -ENXIO : 0;
  99 }
 100
 101 static void __exit cleanup_impa7(void)
 102 {
 103         int i;
 104         for (i=0; i<NUM_FLASHBANKS; i++) {
 105                 if (impa7_mtd[i]) {
 106                         mtd_device_unregister(impa7_mtd[i]);
 107                         map_destroy(impa7_mtd[i]);
 108                         iounmap((void __iomem *)impa7_map[i].virt);
 109                         impa7_map[i].virt = NULL;
 110                 }
 111         }
 112 }
 113
 114 module_init(init_impa7);
 115 module_exit(cleanup_impa7);
 116
 117 MODULE_LICENSE("GPL");
 118 MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
 119 MODULE_DESCRIPTION("MTD map driver for implementa impA7");