drivers/mtd/maps/physmap64.c

   1 /*
   2  * $Id: physmap64.c,v 1.1 2002/09/05 05:12:32 acurtis 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 <asm/io.h>
  11 #include <linux/mtd/mtd.h>
  12 #include <linux/mtd/map.h>
  13 #include <linux/config.h>
  14 #include <linux/mtd/cfi.h>
  15
  16 #ifdef CONFIG_MTD_PARTITIONS
  17 #include <linux/mtd/partitions.h>
  18 #endif
  19
  20 #define WINDOW_ADDR CONFIG_MTD_PHYSMAP_START
  21 #define WINDOW_SIZE CONFIG_MTD_PHYSMAP_LEN
  22 #define BUSWIDTH CONFIG_MTD_PHYSMAP_BUSWIDTH
  23
  24 static struct mtd_info *mymtd;
  25
  26 __u8 physmap_read8(struct map_info *map, unsigned long ofs)
  27 {
  28         return __raw_readb(map->map_priv_1 + ofs);
  29 }
  30
  31 __u16 physmap_read16(struct map_info *map, unsigned long ofs)
  32 {
  33         return __raw_readw(map->map_priv_1 + ofs);
  34 }
  35
  36 __u32 physmap_read32(struct map_info *map, unsigned long ofs)
  37 {
  38         return __raw_readl(map->map_priv_1 + ofs);
  39 }
  40
  41 __u64 physmap_read64(struct map_info *map, unsigned long ofs)
  42 {
  43         return __raw_readll(map->map_priv_1 + ofs);
  44 }
  45
  46 void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  47 {
  48         memcpy_fromio(to, map->map_priv_1 + from, len);
  49 }
  50
  51 void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
  52 {
  53         __raw_writeb(d, map->map_priv_1 + adr);
  54         mb();
  55 }
  56
  57 void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
  58 {
  59         __raw_writew(d, map->map_priv_1 + adr);
  60         mb();
  61 }
  62
  63 void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
  64 {
  65         __raw_writel(d, map->map_priv_1 + adr);
  66         mb();
  67 }
  68
  69 void physmap_write64(struct map_info *map, __u64 d, unsigned long adr)
  70 {
  71         __raw_writell(d, map->map_priv_1 + adr);
  72         mb();
  73 }
  74
  75 void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  76 {
  77         memcpy_toio(map->map_priv_1 + to, from, len);
  78 }
  79
  80 struct map_info physmap_map = {
  81         name: "Physically mapped flash",
  82         size: WINDOW_SIZE,
  83         buswidth: BUSWIDTH,
  84         read8: physmap_read8,
  85         read16: physmap_read16,
  86         read32: physmap_read32,
  87         read64: physmap_read64,
  88         copy_from: physmap_copy_from,
  89         write8: physmap_write8,
  90         write16: physmap_write16,
  91         write32: physmap_write32,
  92         write64: physmap_write64,
  93         copy_to: physmap_copy_to
  94 };
  95
  96 #ifdef CONFIG_MTD_PARTITIONS
  97 #ifdef CONFIG_MTD_CMDLINE_PARTS
  98 static struct mtd_partition *mtd_parts = 0;
  99 static int                   mtd_parts_nb = 0;
 100 #else
 101 static struct mtd_partition physmap_partitions[] = {
 102 /* Put your own partition definitions here */
 103 #if 0
 104         {
 105                 name:           "bootROM",
 106                 size:           0x80000,
 107                 offset:         0,
 108                 mask_flags:     MTD_WRITEABLE,  /* force read-only */
 109         }, {
 110                 name:           "zImage",
 111                 size:           0x100000,
 112                 offset:         MTDPART_OFS_APPEND,
 113                 mask_flags:     MTD_WRITEABLE,  /* force read-only */
 114         }, {
 115                 name:           "ramdisk.gz",
 116                 size:           0x300000,
 117                 offset:         MTDPART_OFS_APPEND,
 118                 mask_flags:     MTD_WRITEABLE,  /* force read-only */
 119         }, {
 120                 name:           "User FS",
 121                 size:           MTDPART_SIZ_FULL,
 122                 offset:         MTDPART_OFS_APPEND,
 123         }
 124 #endif
 125 };
 126
 127 #define NUM_PARTITIONS  (sizeof(physmap_partitions)/sizeof(struct mtd_partition))
 128
 129 #endif
 130 #endif
 131
 132 int __init init_physmap(void)
 133 {
 134         static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", 0 };
 135         const char **type;
 136
 137         printk(KERN_NOTICE "physmap flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
 138         physmap_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
 139
 140         if (!physmap_map.map_priv_1) {
 141                 printk("Failed to ioremap\n");
 142                 return -EIO;
 143         }
 144
 145         mymtd = 0;
 146         type = rom_probe_types;
 147         for(; !mymtd && *type; type++) {
 148                 mymtd = do_map_probe(*type, &physmap_map);
 149         }
 150         if (mymtd) {
 151                 mymtd->module = THIS_MODULE;
 152
 153                 add_mtd_device(mymtd);
 154 #ifdef CONFIG_MTD_PARTITIONS
 155 #ifdef CONFIG_MTD_CMDLINE_PARTS
 156                 mtd_parts_nb = parse_cmdline_partitions(mymtd, &mtd_parts,
 157                                                         "phys");
 158                 if (mtd_parts_nb > 0)
 159                 {
 160                         printk(KERN_NOTICE
 161                                "Using command line partition definition\n");
 162                         add_mtd_partitions (mymtd, mtd_parts, mtd_parts_nb);
 163                 }
 164 #else
 165                 if (NUM_PARTITIONS != 0)
 166                 {
 167                         printk(KERN_NOTICE
 168                                "Using physmap partition definition\n");
 169                         add_mtd_partitions (mymtd, physmap_partitions, NUM_PARTITIONS);
 170                 }
 171
 172 #endif
 173 #endif
 174                 return 0;
 175         }
 176
 177         iounmap((void *)physmap_map.map_priv_1);
 178         return -ENXIO;
 179 }
 180
 181 static void __exit cleanup_physmap(void)
 182 {
 183         if (mymtd) {
 184                 del_mtd_device(mymtd);
 185                 map_destroy(mymtd);
 186         }
 187         if (physmap_map.map_priv_1) {
 188                 iounmap((void *)physmap_map.map_priv_1);
 189                 physmap_map.map_priv_1 = 0;
 190         }
 191 }
 192
 193 module_init(init_physmap);
 194 module_exit(cleanup_physmap);
 195
 196
 197 MODULE_LICENSE("GPL");
 198 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 199 MODULE_DESCRIPTION("Generic configurable MTD map driver");