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 <asm/ifxmips/ifxmips_ebu.h>
  31 #include <linux/magic.h>
  32 #include <linux/platform_device.h>
  33
  34
  35 static struct map_info
  36 ifxmips_map = {
  37         .name = "ifxmips_mtd",
  38         .bankwidth = 2,
  39         .size = 0x400000,
  40 };
  41
  42 static map_word
  43 ifxmips_read16(struct map_info * map, unsigned long adr)
  44 {
  45         unsigned long flags;
  46         map_word temp;
  47         spin_lock_irqsave(&ebu_lock, flags);
  48         adr ^= 2;
  49         temp.x[0] = *((__u16 *) (map->virt + adr));
  50         spin_unlock_irqrestore(&ebu_lock, flags);
  51         return temp;
  52 }
  53
  54 static void
  55 ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
  56 {
  57         unsigned long flags;
  58         spin_lock_irqsave(&ebu_lock, flags);
  59         adr ^= 2;
  60         *((__u16 *) (map->virt + adr)) = d.x[0];
  61         spin_unlock_irqrestore(&ebu_lock, flags);
  62 }
  63
  64 void
  65 ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  66 {
  67         unsigned char *p;
  68         unsigned char *to_8;
  69         unsigned long flags;
  70         spin_lock_irqsave(&ebu_lock, flags);
  71         from = (unsigned long)(from + map->virt);
  72         p = (unsigned char*) from;
  73         to_8 = (unsigned char*) to;
  74         while(len--)
  75                 *to_8++ = *p++;
  76                 spin_unlock_irqrestore(&ebu_lock, flags);
  77 }
  78
  79 void
  80 ifxmips_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  81 {
  82         unsigned char *p =  (unsigned char*)from;
  83         unsigned char *to_8;
  84         unsigned long flags;
  85         spin_lock_irqsave(&ebu_lock, flags);
  86         to += (unsigned long) map->virt;
  87         to_8 = (unsigned char*)to;
  88         while(len--){
  89                 *p++ = *to_8++;
  90         }
  91         spin_unlock_irqrestore(&ebu_lock, flags);
  92 }
  93
  94 static struct mtd_partition
  95 ifxmips_partitions[4] = {
  96         {
  97                 name:"U-Boot",
  98                 offset:0x00000000,
  99                 size:0x00020000,
 100         },
 101         {
 102                 name:"U-Boot-Env",
 103                 offset:0x00020000,
 104                 size:0x00010000,
 105         },
 106         {
 107                 name:"kernel",
 108                 offset:0x00030000,
 109                 size:0x0,
 110         },
 111         {
 112                 name:"rootfs",
 113                 offset:0x0,
 114                 size:0x0,
 115         },
 116 };
 117
 118 int
 119 find_uImage_size(unsigned long start_offset){
 120         unsigned long temp;
 121
 122         ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
 123         printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
 124         return temp + 0x40;
 125 }
 126
 127 int
 128 detect_squashfs_partition(unsigned long start_offset){
 129         unsigned long temp;
 130
 131         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
 132
 133         return (temp == SQUASHFS_MAGIC);
 134 }
 135
 136 static int
 137 ifxmips_mtd_probe(struct platform_device *dev)
 138 {
 139         struct mtd_info *ifxmips_mtd = NULL;
 140         struct mtd_partition *parts = NULL;
 141         unsigned long uimage_size;
 142
 143         ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
 144
 145         ifxmips_map.read = ifxmips_read16;
 146         ifxmips_map.write = ifxmips_write16;
 147         ifxmips_map.copy_from = ifxmips_copy_from;
 148         ifxmips_map.copy_to = ifxmips_copy_to;
 149
 150         ifxmips_map.phys = IFXMIPS_FLASH_START;
 151         ifxmips_map.virt = ioremap_nocache(IFXMIPS_FLASH_START, IFXMIPS_FLASH_MAX);
 152         ifxmips_map.size = IFXMIPS_FLASH_MAX;
 153         if(!ifxmips_map.virt)
 154         {
 155                 printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
 156                 return -EIO;
 157         }
 158
 159         ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
 160         if(!ifxmips_mtd)
 161         {
 162                 iounmap(ifxmips_map.virt);
 163                 printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
 164                 return -ENXIO;
 165         }
 166
 167         ifxmips_mtd->owner = THIS_MODULE;
 168
 169         uimage_size = find_uImage_size(ifxmips_partitions[2].offset);
 170
 171         if(detect_squashfs_partition(ifxmips_partitions[2].offset + uimage_size))
 172         {
 173                 printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
 174         } else {
 175                 uimage_size &= ~0xffff;
 176                 uimage_size += 0x10000;
 177         }
 178
 179         ifxmips_partitions[2].size = uimage_size;
 180         ifxmips_partitions[3].offset = ifxmips_partitions[2].offset + ifxmips_partitions[2].size;
 181         ifxmips_partitions[3].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - ifxmips_partitions[3].offset;
 182
 183         parts = &ifxmips_partitions[0];
 184         add_mtd_partitions(ifxmips_mtd, parts, 4);
 185
 186         printk(KERN_INFO "ifxmips_mtd: added ifxmips flash with %dMB\n", ifxmips_mtd->size >> 20);
 187         return 0;
 188 }
 189
 190 static struct
 191 platform_driver ifxmips_mtd_driver = {
 192         .probe = ifxmips_mtd_probe,
 193         .driver = {
 194                 .name = "ifxmips_mtd",
 195                 .owner = THIS_MODULE,
 196         },
 197 };
 198
 199 int __init
 200 init_ifxmips_mtd(void)
 201 {
 202         int ret = platform_driver_register(&ifxmips_mtd_driver);
 203         if(ret)
 204                 printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
 205         return ret;
 206 }
 207
 208 static void
 209 __exit
 210 cleanup_ifxmips_mtd(void)
 211 {
 212         platform_driver_unregister(&ifxmips_mtd_driver);
 213 }
 214
 215 module_init(init_ifxmips_mtd);
 216 module_exit(cleanup_ifxmips_mtd);
 217
 218 MODULE_LICENSE("GPL");
 219 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 220 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");