target/linux/ifxmips/files/drivers/mtd/maps/ifxmips.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
  17  * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <asm/io.h>
  24 #include <linux/init.h>
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/map.h>
  27 #include <linux/mtd/partitions.h>
  28 #include <linux/mtd/cfi.h>
  29 #include <asm/ifxmips/ifxmips.h>
  30 #include <linux/magic.h>
  31 #include <linux/platform_device.h>
  32
  33
  34 static struct map_info
  35 ifxmips_map = {
  36         .name = "ifxmips_mtd",
  37         .bankwidth = 2,
  38         .size = 0x400000,
  39 };
  40
  41 static map_word
  42 ifxmips_read16(struct map_info * map, unsigned long adr)
  43 {
  44         map_word temp;
  45
  46         adr ^= 2;
  47         temp.x[0] = *((__u16 *) (map->virt + adr));
  48
  49         return temp;
  50 }
  51
  52 static void
  53 ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
  54 {
  55         adr ^= 2;
  56         *((__u16 *) (map->virt + adr)) = d.x[0];
  57 }
  58
  59 void
  60 ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  61 {
  62         unsigned char *p;
  63         unsigned char *to_8;
  64
  65         from = (unsigned long)(from + map->virt);
  66         p = (unsigned char*) from;
  67         to_8 = (unsigned char*) to;
  68         while(len--)
  69                 *to_8++ = *p++;
  70 }
  71
  72 void
  73 ifxmips_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  74 {
  75         unsigned char *p =  (unsigned char*)from;
  76         unsigned char *to_8;
  77
  78         to += (unsigned long) map->virt;
  79         to_8 = (unsigned char*)to;
  80         while(len--){
  81                 *p++ = *to_8++;
  82         }
  83 }
  84
  85 static struct mtd_partition
  86 ifxmips_partitions[4] = {
  87         {
  88                 name:"U-Boot",
  89                 offset:0x00000000,
  90                 size:0x00020000,
  91         },
  92         {
  93                 name:"U-Boot-Env",
  94                 offset:0x00020000,
  95                 size:0x00010000,
  96         },
  97         {
  98                 name:"kernel",
  99                 offset:0x00030000,
 100                 size:0x0,
 101         },
 102         {
 103                 name:"rootfs",
 104                 offset:0x0,
 105                 size:0x0,
 106         },
 107 };
 108
 109 int
 110 find_uImage_size(unsigned long start_offset){
 111         unsigned long temp;
 112
 113         ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
 114         printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
 115         return temp + 0x40;
 116 }
 117
 118 int
 119 detect_squashfs_partition(unsigned long start_offset){
 120         unsigned long temp;
 121
 122         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
 123
 124         return (temp == SQUASHFS_MAGIC);
 125 }
 126
 127 static int
 128 ifxmips_mtd_probe(struct platform_device *dev)
 129 {
 130         struct mtd_info *ifxmips_mtd = NULL;
 131         struct mtd_partition *parts = NULL;
 132         unsigned long uimage_size;
 133
 134         ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
 135
 136         ifxmips_map.read = ifxmips_read16;
 137         ifxmips_map.write = ifxmips_write16;
 138         ifxmips_map.copy_from = ifxmips_copy_from;
 139         ifxmips_map.copy_to = ifxmips_copy_to;
 140
 141         ifxmips_map.phys = IFXMIPS_FLASH_START;
 142         ifxmips_map.virt = ioremap_nocache(IFXMIPS_FLASH_START, IFXMIPS_FLASH_MAX);
 143         ifxmips_map.size = IFXMIPS_FLASH_MAX;
 144         if(!ifxmips_map.virt)
 145         {
 146                 printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
 147                 return -EIO;
 148         }
 149
 150         ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
 151         if(!ifxmips_mtd)
 152         {
 153                 iounmap(ifxmips_map.virt);
 154                 printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
 155                 return -ENXIO;
 156         }
 157
 158         ifxmips_mtd->owner = THIS_MODULE;
 159
 160         uimage_size = find_uImage_size(ifxmips_partitions[2].offset);
 161
 162         if(detect_squashfs_partition(ifxmips_partitions[2].offset + uimage_size))
 163         {
 164                 printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
 165         } else {
 166                 uimage_size &= ~0xffff;
 167                 uimage_size += 0x10000;
 168         }
 169
 170         ifxmips_partitions[2].size = uimage_size;
 171         ifxmips_partitions[3].offset = ifxmips_partitions[2].offset + ifxmips_partitions[2].size;
 172         ifxmips_partitions[3].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - ifxmips_partitions[3].offset;
 173
 174         parts = &ifxmips_partitions[0];
 175         add_mtd_partitions(ifxmips_mtd, parts, 4);
 176
 177         printk(KERN_INFO "ifxmips_mtd: added ifxmips flash with %dMB\n", ifxmips_mtd->size >> 20);
 178         return 0;
 179 }
 180
 181 static struct
 182 platform_driver ifxmips_mtd_driver = {
 183         .probe = ifxmips_mtd_probe,
 184         .driver = {
 185                 .name = "ifxmips_mtd",
 186                 .owner = THIS_MODULE,
 187         },
 188 };
 189
 190 int __init
 191 init_ifxmips_mtd(void)
 192 {
 193         int ret = platform_driver_register(&ifxmips_mtd_driver);
 194         if(ret)
 195                 printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
 196         return ret;
 197 }
 198
 199 static void
 200 __exit
 201 cleanup_ifxmips_mtd(void)
 202 {
 203         platform_driver_unregister(&ifxmips_mtd_driver);
 204 }
 205
 206 module_init(init_ifxmips_mtd);
 207 module_exit(cleanup_ifxmips_mtd);
 208
 209 MODULE_LICENSE("GPL");
 210 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 211 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");