drivers/mtd/maps/nora.c

   1 /*
   2  * $Id: nora.c,v 1.21 2001/10/02 15:05:14 dwmw2 Exp $
   3  *
   4  * This is so simple I love it.
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10
  11 #include <linux/mtd/mtd.h>
  12 #include <linux/mtd/map.h>
  13
  14
  15 #define WINDOW_ADDR 0xd0000000
  16 #define WINDOW_SIZE 0x04000000
  17
  18 static struct mtd_info *mymtd;
  19
  20 __u8 nora_read8(struct map_info *map, unsigned long ofs)
  21 {
  22   return *(__u8 *)(WINDOW_ADDR + ofs);
  23 }
  24
  25 __u16 nora_read16(struct map_info *map, unsigned long ofs)
  26 {
  27   return *(__u16 *)(WINDOW_ADDR + ofs);
  28 }
  29
  30 __u32 nora_read32(struct map_info *map, unsigned long ofs)
  31 {
  32   return *(__u32 *)(WINDOW_ADDR + ofs);
  33 }
  34
  35 void nora_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  36 {
  37   memcpy(to, (void *)(WINDOW_ADDR + from), len);
  38 }
  39
  40 void nora_write8(struct map_info *map, __u8 d, unsigned long adr)
  41 {
  42   *(__u8 *)(WINDOW_ADDR + adr) = d;
  43 }
  44
  45 void nora_write16(struct map_info *map, __u16 d, unsigned long adr)
  46 {
  47   *(__u16 *)(WINDOW_ADDR + adr) = d;
  48 }
  49
  50 void nora_write32(struct map_info *map, __u32 d, unsigned long adr)
  51 {
  52   *(__u32 *)(WINDOW_ADDR + adr) = d;
  53 }
  54
  55 void nora_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  56 {
  57   memcpy((void *)(WINDOW_ADDR + to), from, len);
  58 }
  59
  60 struct map_info nora_map = {
  61         name: "NORA",
  62         size: WINDOW_SIZE,
  63         buswidth: 2,
  64         read8: nora_read8,
  65         read16: nora_read16,
  66         read32: nora_read32,
  67         copy_from: nora_copy_from,
  68         write8: nora_write8,
  69         write16: nora_write16,
  70         write32: nora_write32,
  71         copy_to: nora_copy_to
  72 };
  73
  74
  75 static int nora_mtd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
  76 {
  77         return mymtd->read(mymtd, from + (unsigned long)mtd->priv, len, retlen, buf);
  78 }
  79
  80 static int nora_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
  81 {
  82         return mymtd->write(mymtd, to + (unsigned long)mtd->priv, len, retlen, buf);
  83 }
  84
  85 static int nora_mtd_erase (struct mtd_info *mtd, struct erase_info *instr)
  86 {
  87         instr->addr += (unsigned long)mtd->priv;
  88         return mymtd->erase(mymtd, instr);
  89 }
  90
  91 static void nora_mtd_sync (struct mtd_info *mtd)
  92 {
  93         mymtd->sync(mymtd);
  94 }
  95
  96 static int nora_mtd_suspend (struct mtd_info *mtd)
  97 {
  98         return mymtd->suspend(mymtd);
  99 }
 100
 101 static void nora_mtd_resume (struct mtd_info *mtd)
 102 {
 103         mymtd->resume(mymtd);
 104 }
 105
 106
 107 static struct mtd_info nora_mtds[4] = {  /* boot, kernel, ramdisk, fs */
 108         {
 109                 type: MTD_NORFLASH,
 110                 flags: MTD_CAP_NORFLASH,
 111                 size: 0x60000,
 112                 erasesize: 0x20000,
 113                 name: "NORA boot firmware",
 114                 module: THIS_MODULE,
 115                 erase: nora_mtd_erase,
 116                 read: nora_mtd_read,
 117                 write: nora_mtd_write,
 118                 suspend: nora_mtd_suspend,
 119                 resume: nora_mtd_resume,
 120                 sync: nora_mtd_sync,
 121                 priv: (void *)0
 122         },
 123         {
 124                 type: MTD_NORFLASH,
 125                 flags: MTD_CAP_NORFLASH,
 126                 size: 0x0a0000,
 127                 erasesize: 0x20000,
 128                 name: "NORA kernel",
 129                 module: THIS_MODULE,
 130                 erase: nora_mtd_erase,
 131                 read: nora_mtd_read,
 132                 write: nora_mtd_write,
 133                 suspend: nora_mtd_suspend,
 134                 resume: nora_mtd_resume,
 135                 sync: nora_mtd_sync,
 136                 priv: (void *)0x60000
 137         },
 138         {
 139                 type: MTD_NORFLASH,
 140                 flags: MTD_CAP_NORFLASH,
 141                 size: 0x900000,
 142                 erasesize: 0x20000,
 143                 name: "NORA root filesystem",
 144                 module: THIS_MODULE,
 145                 erase: nora_mtd_erase,
 146                 read: nora_mtd_read,
 147                 write: nora_mtd_write,
 148                 suspend: nora_mtd_suspend,
 149                 resume: nora_mtd_resume,
 150                 sync: nora_mtd_sync,
 151                 priv: (void *)0x100000
 152         },
 153         {
 154                 type: MTD_NORFLASH,
 155                 flags: MTD_CAP_NORFLASH,
 156                 size: 0x1600000,
 157                 erasesize: 0x20000,
 158                 name: "NORA second filesystem",
 159                 module: THIS_MODULE,
 160                 erase: nora_mtd_erase,
 161                 read: nora_mtd_read,
 162                 write: nora_mtd_write,
 163                 suspend: nora_mtd_suspend,
 164                 resume: nora_mtd_resume,
 165                 sync: nora_mtd_sync,
 166                 priv: (void *)0xa00000
 167         }
 168 };
 169
 170 int __init init_nora(void)
 171 {
 172         printk(KERN_NOTICE "nora flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
 173
 174         mymtd = do_map_probe("cfi_probe", &nora_map);
 175         if (mymtd) {
 176                 mymtd->module = THIS_MODULE;
 177
 178                 add_mtd_device(&nora_mtds[2]);
 179                 add_mtd_device(&nora_mtds[0]);
 180                 add_mtd_device(&nora_mtds[1]);
 181                 add_mtd_device(&nora_mtds[3]);
 182                 return 0;
 183         }
 184
 185         return -ENXIO;
 186 }
 187
 188 static void __exit cleanup_nora(void)
 189 {
 190         if (mymtd) {
 191                 del_mtd_device(&nora_mtds[3]);
 192                 del_mtd_device(&nora_mtds[1]);
 193                 del_mtd_device(&nora_mtds[0]);
 194                 del_mtd_device(&nora_mtds[2]);
 195                 map_destroy(mymtd);
 196         }
 197 }
 198
 199 module_init(init_nora);
 200 module_exit(cleanup_nora);
 201
 202 MODULE_LICENSE("GPL");
 203 MODULE_AUTHOR("Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>");
 204 MODULE_DESCRIPTION("MTD map driver for Nora board");