drivers/mtd/maps/physmap.c

   1 /*
   2  * $Id: physmap.c,v 1.29 2003/05/29 09:24:10 dwmw2 Exp $
   3  *
   4  * Normal mappings of chips in physical memory
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <asm/io.h>
  13 #include <linux/mtd/mtd.h>
  14 #include <linux/mtd/map.h>
  15 #include <linux/config.h>
  16 #include <linux/mtd/partitions.h>
  17
  18 #define WINDOW_ADDR CONFIG_MTD_PHYSMAP_START
  19 #define WINDOW_SIZE CONFIG_MTD_PHYSMAP_LEN
  20 #define BUSWIDTH CONFIG_MTD_PHYSMAP_BUSWIDTH
  21
  22 static struct mtd_info *mymtd;
  23
  24
  25 struct map_info physmap_map = {
  26         .name = "Physically mapped flash",
  27         .size = WINDOW_SIZE,
  28         .buswidth = BUSWIDTH,
  29         .phys = WINDOW_ADDR,
  30 };
  31
  32 #ifdef CONFIG_MTD_PARTITIONS
  33 static struct mtd_partition *mtd_parts;
  34 static int                   mtd_parts_nb;
  35
  36 static struct mtd_partition physmap_partitions[] = {
  37 #if 0
  38 /* Put your own partition definitions here */
  39         {
  40                 .name =         "bootROM",
  41                 .size =         0x80000,
  42                 .offset =       0,
  43                 .mask_flags =   MTD_WRITEABLE,  /* force read-only */
  44         }, {
  45                 .name =         "zImage",
  46                 .size =         0x100000,
  47                 .offset =       MTDPART_OFS_APPEND,
  48                 .mask_flags =   MTD_WRITEABLE,  /* force read-only */
  49         }, {
  50                 .name =         "ramdisk.gz",
  51                 .size =         0x300000,
  52                 .offset =       MTDPART_OFS_APPEND,
  53                 .mask_flags =   MTD_WRITEABLE,  /* force read-only */
  54         }, {
  55                 .name =         "User FS",
  56                 .size =         MTDPART_SIZ_FULL,
  57                 .offset =       MTDPART_OFS_APPEND,
  58         }
  59 #endif
  60 };
  61
  62 #define NUM_PARTITIONS  (sizeof(physmap_partitions)/sizeof(struct mtd_partition))
  63 const char *part_probes[] = {"cmdlinepart", "RedBoot", NULL};
  64
  65 #endif /* CONFIG_MTD_PARTITIONS */
  66
  67 int __init init_physmap(void)
  68 {
  69         static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", 0 };
  70         const char **type;
  71
  72         printk(KERN_NOTICE "physmap flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
  73         physmap_map.virt = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
  74
  75         if (!physmap_map.virt) {
  76                 printk("Failed to ioremap\n");
  77                 return -EIO;
  78         }
  79
  80         simple_map_init(&physmap_map);
  81
  82         mymtd = 0;
  83         type = rom_probe_types;
  84         for(; !mymtd && *type; type++) {
  85                 mymtd = do_map_probe(*type, &physmap_map);
  86         }
  87         if (mymtd) {
  88                 mymtd->owner = THIS_MODULE;
  89
  90 #ifdef CONFIG_MTD_PARTITIONS
  91                 mtd_parts_nb = parse_mtd_partitions(mymtd, part_probes,
  92                                                     &mtd_parts, 0);
  93
  94                 if (mtd_parts_nb > 0)
  95                 {
  96                         add_mtd_partitions (mymtd, mtd_parts, mtd_parts_nb);
  97                         return 0;
  98                 }
  99
 100                 if (NUM_PARTITIONS != 0)
 101                 {
 102                         printk(KERN_NOTICE
 103                                "Using physmap partition definition\n");
 104                         add_mtd_partitions (mymtd, physmap_partitions, NUM_PARTITIONS);
 105                         return 0;
 106                 }
 107
 108 #endif
 109                 add_mtd_device(mymtd);
 110
 111                 return 0;
 112         }
 113
 114         iounmap((void *)physmap_map.virt);
 115         return -ENXIO;
 116 }
 117
 118 static void __exit cleanup_physmap(void)
 119 {
 120 #ifdef CONFIG_MTD_PARTITIONS
 121         if (mtd_parts_nb) {
 122                 del_mtd_partitions(mymtd);
 123                 kfree(mtd_parts);
 124         } else if (NUM_PARTITIONS) {
 125                 del_mtd_partitions(mymtd);
 126         } else {
 127                 del_mtd_device(mymtd);
 128         }
 129 #else
 130         del_mtd_device(mymtd);
 131 #endif
 132         map_destroy(mymtd);
 133
 134         iounmap((void *)physmap_map.virt);
 135         physmap_map.virt = 0;
 136 }
 137
 138 module_init(init_physmap);
 139 module_exit(cleanup_physmap);
 140
 141
 142 MODULE_LICENSE("GPL");
 143 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 144 MODULE_DESCRIPTION("Generic configurable MTD map driver");