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 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         unsigned long flags;
  45         map_word temp;
  46         spin_lock_irqsave(&ebu_lock, flags);
  47         adr ^= 2;
  48         temp.x[0] = *((__u16*)(map->virt + adr));
  49         spin_unlock_irqrestore(&ebu_lock, flags);
  50         return temp;
  51 }
  52
  53 static void
  54 ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
  55 {
  56         unsigned long flags;
  57         spin_lock_irqsave(&ebu_lock, flags);
  58         adr ^= 2;
  59         *((__u16*)(map->virt + adr)) = d.x[0];
  60         spin_unlock_irqrestore(&ebu_lock, flags);
  61 }
  62
  63 void
  64 ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  65 {
  66         unsigned char *p;
  67         unsigned char *to_8;
  68         unsigned long flags;
  69         spin_lock_irqsave(&ebu_lock, flags);
  70         from = (unsigned long)(from + map->virt);
  71         p = (unsigned char*) from;
  72         to_8 = (unsigned char*) to;
  73         while(len--)
  74                 *to_8++ = *p++;
  75         spin_unlock_irqrestore(&ebu_lock, flags);
  76 }
  77
  78 void
  79 ifxmips_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
  80 {
  81         unsigned char *p =  (unsigned char*)from;
  82         unsigned char *to_8;
  83         unsigned long flags;
  84         spin_lock_irqsave(&ebu_lock, flags);
  85         to += (unsigned long) map->virt;
  86         to_8 = (unsigned char*)to;
  87         while(len--)
  88                 *p++ = *to_8++;
  89         spin_unlock_irqrestore(&ebu_lock, flags);
  90 }
  91
  92 static struct mtd_partition
  93 ifxmips_partitions[4] = {
  94         {
  95                 name:"U-Boot",
  96                 offset:0x00000000,
  97                 size:0x00020000,
  98         },
  99         {
 100                 name:"U-Boot-Env",
 101                 offset:0x00020000,
 102                 size:0x00010000,
 103         },
 104         {
 105                 name:"kernel",
 106                 offset:0x00030000,
 107                 size:0x0,
 108         },
 109         {
 110                 name:"rootfs",
 111                 offset:0x0,
 112                 size:0x0,
 113         },
 114 };
 115
 116 int
 117 find_uImage_size(unsigned long start_offset){
 118         unsigned long temp;
 119         ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
 120         printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
 121         return temp + 0x40;
 122 }
 123
 124 int
 125 detect_squashfs_partition(unsigned long start_offset){
 126         unsigned long temp;
 127         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
 128         return (temp == SQUASHFS_MAGIC);
 129 }
 130
 131 static int
 132 ifxmips_mtd_probe(struct platform_device *dev)
 133 {
 134         struct mtd_info *ifxmips_mtd = NULL;
 135         struct mtd_partition *parts = NULL;
 136         unsigned long uimage_size;
 137
 138         ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
 139
 140         ifxmips_map.read = ifxmips_read16;
 141         ifxmips_map.write = ifxmips_write16;
 142         ifxmips_map.copy_from = ifxmips_copy_from;
 143         ifxmips_map.copy_to = ifxmips_copy_to;
 144         ifxmips_map.phys = dev->resource->start;
 145         ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
 146         ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
 147
 148         if(!ifxmips_map.virt)
 149         {
 150                 printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
 151                 return -EIO;
 152         }
 153
 154         ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
 155         if(!ifxmips_mtd)
 156         {
 157                 iounmap(ifxmips_map.virt);
 158                 printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
 159                 return -ENXIO;
 160         }
 161
 162         ifxmips_mtd->owner = THIS_MODULE;
 163         uimage_size = find_uImage_size(ifxmips_partitions[2].offset);
 164
 165         if(detect_squashfs_partition(ifxmips_partitions[2].offset + uimage_size))
 166         {
 167                 printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
 168         } else {
 169                 uimage_size &= ~0xffff;
 170                 uimage_size += 0x10000;
 171         }
 172
 173         ifxmips_partitions[2].size = uimage_size;
 174         ifxmips_partitions[3].offset = ifxmips_partitions[2].offset + ifxmips_partitions[2].size;
 175         ifxmips_partitions[3].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - ifxmips_partitions[3].offset;
 176
 177         parts = &ifxmips_partitions[0];
 178         add_mtd_partitions(ifxmips_mtd, parts, 4);
 179
 180         printk(KERN_INFO "ifxmips_mtd: added ifxmips flash with %dMB\n", ifxmips_mtd->size >> 20);
 181         return 0;
 182 }
 183
 184 static struct
 185 platform_driver ifxmips_mtd_driver = {
 186         .probe = ifxmips_mtd_probe,
 187         .driver = {
 188                 .name = "ifxmips_mtd",
 189                 .owner = THIS_MODULE,
 190         },
 191 };
 192
 193 int __init
 194 init_ifxmips_mtd(void)
 195 {
 196         int ret = platform_driver_register(&ifxmips_mtd_driver);
 197         if(ret)
 198                 printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
 199         return ret;
 200 }
 201
 202 static void __exit
 203 cleanup_ifxmips_mtd(void)
 204 {
 205         platform_driver_unregister(&ifxmips_mtd_driver);
 206 }
 207
 208 module_init(init_ifxmips_mtd);
 209 module_exit(cleanup_ifxmips_mtd);
 210
 211 MODULE_LICENSE("GPL");
 212 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 213 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");