drivers/mtd/maps/physmap.c

   1 /*
   2  * $Id: physmap.c,v 1.39 2005/11/29 14:49:36 gleixner Exp $
   3  *
   4  * Normal mappings of chips in physical memory
   5  *
   6  * Copyright (C) 2003 MontaVista Software Inc.
   7  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   8  *
   9  * 031022 - [jsun] add run-time configure and partition setup
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <asm/io.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/config.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <linux/mtd/physmap.h>
  23
  24 static struct mtd_info *mymtd;
  25
  26 struct map_info physmap_map = {
  27         .name = "phys_mapped_flash",
  28         .phys = CONFIG_MTD_PHYSMAP_START,
  29         .size = CONFIG_MTD_PHYSMAP_LEN,
  30         .bankwidth = CONFIG_MTD_PHYSMAP_BANKWIDTH,
  31 };
  32
  33 #ifdef CONFIG_MTD_PARTITIONS
  34 static struct mtd_partition *mtd_parts;
  35 static int                   mtd_parts_nb;
  36
  37 static int num_physmap_partitions;
  38 static struct mtd_partition *physmap_partitions;
  39
  40 static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
  41
  42 void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
  43 {
  44         physmap_partitions=parts;
  45         num_physmap_partitions=num_parts;
  46 }
  47 #endif /* CONFIG_MTD_PARTITIONS */
  48
  49 static int __init init_physmap(void)
  50 {
  51         static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
  52         const char **type;
  53
  54         printk(KERN_NOTICE "physmap flash device: %lx at %lx\n", physmap_map.size, physmap_map.phys);
  55         physmap_map.virt = ioremap(physmap_map.phys, physmap_map.size);
  56
  57         if (!physmap_map.virt) {
  58                 printk("Failed to ioremap\n");
  59                 return -EIO;
  60         }
  61
  62         simple_map_init(&physmap_map);
  63
  64         mymtd = NULL;
  65         type = rom_probe_types;
  66         for(; !mymtd && *type; type++) {
  67                 mymtd = do_map_probe(*type, &physmap_map);
  68         }
  69         if (mymtd) {
  70                 mymtd->owner = THIS_MODULE;
  71
  72 #ifdef CONFIG_MTD_PARTITIONS
  73                 mtd_parts_nb = parse_mtd_partitions(mymtd, part_probes,
  74                                                     &mtd_parts, 0);
  75
  76                 if (mtd_parts_nb > 0)
  77                 {
  78                         add_mtd_partitions (mymtd, mtd_parts, mtd_parts_nb);
  79                         return 0;
  80                 }
  81
  82                 if (num_physmap_partitions != 0)
  83                 {
  84                         printk(KERN_NOTICE
  85                                "Using physmap partition definition\n");
  86                         add_mtd_partitions (mymtd, physmap_partitions, num_physmap_partitions);
  87                         return 0;
  88                 }
  89
  90 #endif
  91                 add_mtd_device(mymtd);
  92
  93                 return 0;
  94         }
  95
  96         iounmap(physmap_map.virt);
  97         return -ENXIO;
  98 }
  99
 100 static void __exit cleanup_physmap(void)
 101 {
 102 #ifdef CONFIG_MTD_PARTITIONS
 103         if (mtd_parts_nb) {
 104                 del_mtd_partitions(mymtd);
 105                 kfree(mtd_parts);
 106         } else if (num_physmap_partitions) {
 107                 del_mtd_partitions(mymtd);
 108         } else {
 109                 del_mtd_device(mymtd);
 110         }
 111 #else
 112         del_mtd_device(mymtd);
 113 #endif
 114         map_destroy(mymtd);
 115
 116         iounmap(physmap_map.virt);
 117         physmap_map.virt = NULL;
 118 }
 119
 120 module_init(init_physmap);
 121 module_exit(cleanup_physmap);
 122
 123
 124 MODULE_LICENSE("GPL");
 125 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 126 MODULE_DESCRIPTION("Generic configurable MTD map driver");