release/src-rt-6.x/linux/linux-2.6/drivers/mtd/maps/integrator-flash.c

   1 /*======================================================================
   2
   3     drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver
   4
   5     Copyright (C) 2000 ARM Limited
   6     Copyright (C) 2003 Deep Blue Solutions Ltd.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21
  22    This is access code for flashes using ARM's flash partitioning
  23    standards.
  24
  25    $Id: integrator-flash.c,v 1.20 2005/11/07 11:14:27 gleixner Exp $
  26
  27 ======================================================================*/
  28
  29 #include <linux/module.h>
  30 #include <linux/types.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/ioport.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/init.h>
  36
  37 #include <linux/mtd/mtd.h>
  38 #include <linux/mtd/map.h>
  39 #include <linux/mtd/partitions.h>
  40
  41 #include <asm/mach/flash.h>
  42 #include <asm/hardware.h>
  43 #include <asm/io.h>
  44 #include <asm/system.h>
  45
  46 #ifdef CONFIG_ARCH_P720T
  47 #define FLASH_BASE              (0x04000000)
  48 #define FLASH_SIZE              (64*1024*1024)
  49 #endif
  50
  51 struct armflash_info {
  52         struct flash_platform_data *plat;
  53         struct resource         *res;
  54         struct mtd_partition    *parts;
  55         struct mtd_info         *mtd;
  56         struct map_info         map;
  57 };
  58
  59 static void armflash_set_vpp(struct map_info *map, int on)
  60 {
  61         struct armflash_info *info = container_of(map, struct armflash_info, map);
  62
  63         if (info->plat && info->plat->set_vpp)
  64                 info->plat->set_vpp(on);
  65 }
  66
  67 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
  68
  69 static int armflash_probe(struct platform_device *dev)
  70 {
  71         struct flash_platform_data *plat = dev->dev.platform_data;
  72         struct resource *res = dev->resource;
  73         unsigned int size = res->end - res->start + 1;
  74         struct armflash_info *info;
  75         int err;
  76         void __iomem *base;
  77
  78         info = kzalloc(sizeof(struct armflash_info), GFP_KERNEL);
  79         if (!info) {
  80                 err = -ENOMEM;
  81                 goto out;
  82         }
  83
  84         info->plat = plat;
  85         if (plat && plat->init) {
  86                 err = plat->init();
  87                 if (err)
  88                         goto no_resource;
  89         }
  90
  91         info->res = request_mem_region(res->start, size, "armflash");
  92         if (!info->res) {
  93                 err = -EBUSY;
  94                 goto no_resource;
  95         }
  96
  97         base = ioremap(res->start, size);
  98         if (!base) {
  99                 err = -ENOMEM;
 100                 goto no_mem;
 101         }
 102
 103         /*
 104          * look for CFI based flash parts fitted to this board
 105          */
 106         info->map.size          = size;
 107         info->map.bankwidth     = plat->width;
 108         info->map.phys          = res->start;
 109         info->map.virt          = base;
 110         info->map.name          = dev->dev.bus_id;
 111         info->map.set_vpp       = armflash_set_vpp;
 112
 113         simple_map_init(&info->map);
 114
 115         /*
 116          * Also, the CFI layer automatically works out what size
 117          * of chips we have, and does the necessary identification
 118          * for us automatically.
 119          */
 120         info->mtd = do_map_probe(plat->map_name, &info->map);
 121         if (!info->mtd) {
 122                 err = -ENXIO;
 123                 goto no_device;
 124         }
 125
 126         info->mtd->owner = THIS_MODULE;
 127
 128         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
 129         if (err > 0) {
 130                 err = add_mtd_partitions(info->mtd, info->parts, err);
 131                 if (err)
 132                         printk(KERN_ERR
 133                                "mtd partition registration failed: %d\n", err);
 134         }
 135
 136         if (err == 0)
 137                 platform_set_drvdata(dev, info);
 138
 139         /*
 140          * If we got an error, free all resources.
 141          */
 142         if (err < 0) {
 143                 if (info->mtd) {
 144                         del_mtd_partitions(info->mtd);
 145                         map_destroy(info->mtd);
 146                 }
 147                 kfree(info->parts);
 148
 149  no_device:
 150                 iounmap(base);
 151  no_mem:
 152                 release_mem_region(res->start, size);
 153  no_resource:
 154                 if (plat && plat->exit)
 155                         plat->exit();
 156                 kfree(info);
 157         }
 158  out:
 159         return err;
 160 }
 161
 162 static int armflash_remove(struct platform_device *dev)
 163 {
 164         struct armflash_info *info = platform_get_drvdata(dev);
 165
 166         platform_set_drvdata(dev, NULL);
 167
 168         if (info) {
 169                 if (info->mtd) {
 170                         del_mtd_partitions(info->mtd);
 171                         map_destroy(info->mtd);
 172                 }
 173                 kfree(info->parts);
 174
 175                 iounmap(info->map.virt);
 176                 release_resource(info->res);
 177                 kfree(info->res);
 178
 179                 if (info->plat && info->plat->exit)
 180                         info->plat->exit();
 181
 182                 kfree(info);
 183         }
 184
 185         return 0;
 186 }
 187
 188 static struct platform_driver armflash_driver = {
 189         .probe          = armflash_probe,
 190         .remove         = armflash_remove,
 191         .driver         = {
 192                 .name   = "armflash",
 193         },
 194 };
 195
 196 static int __init armflash_init(void)
 197 {
 198         return platform_driver_register(&armflash_driver);
 199 }
 200
 201 static void __exit armflash_exit(void)
 202 {
 203         platform_driver_unregister(&armflash_driver);
 204 }
 205
 206 module_init(armflash_init);
 207 module_exit(armflash_exit);
 208
 209 MODULE_AUTHOR("ARM Ltd");
 210 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
 211 MODULE_LICENSE("GPL");