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/config.h>
  30 #include <linux/module.h>
  31 #include <linux/types.h>
  32 #include <linux/kernel.h>
  33 #include <linux/slab.h>
  34 #include <linux/ioport.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/init.h>
  37
  38 #include <linux/mtd/mtd.h>
  39 #include <linux/mtd/map.h>
  40 #include <linux/mtd/partitions.h>
  41
  42 #include <asm/mach/flash.h>
  43 #include <asm/hardware.h>
  44 #include <asm/io.h>
  45 #include <asm/system.h>
  46
  47 #ifdef CONFIG_ARCH_P720T
  48 #define FLASH_BASE              (0x04000000)
  49 #define FLASH_SIZE              (64*1024*1024)
  50 #endif
  51
  52 struct armflash_info {
  53         struct flash_platform_data *plat;
  54         struct resource         *res;
  55         struct mtd_partition    *parts;
  56         struct mtd_info         *mtd;
  57         struct map_info         map;
  58 };
  59
  60 static void armflash_set_vpp(struct map_info *map, int on)
  61 {
  62         struct armflash_info *info = container_of(map, struct armflash_info, map);
  63
  64         if (info->plat && info->plat->set_vpp)
  65                 info->plat->set_vpp(on);
  66 }
  67
  68 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
  69
  70 static int armflash_probe(struct platform_device *dev)
  71 {
  72         struct flash_platform_data *plat = dev->dev.platform_data;
  73         struct resource *res = dev->resource;
  74         unsigned int size = res->end - res->start + 1;
  75         struct armflash_info *info;
  76         int err;
  77         void __iomem *base;
  78
  79         info = kmalloc(sizeof(struct armflash_info), GFP_KERNEL);
  80         if (!info) {
  81                 err = -ENOMEM;
  82                 goto out;
  83         }
  84
  85         memset(info, 0, sizeof(struct armflash_info));
  86
  87         info->plat = plat;
  88         if (plat && plat->init) {
  89                 err = plat->init();
  90                 if (err)
  91                         goto no_resource;
  92         }
  93
  94         info->res = request_mem_region(res->start, size, "armflash");
  95         if (!info->res) {
  96                 err = -EBUSY;
  97                 goto no_resource;
  98         }
  99
 100         base = ioremap(res->start, size);
 101         if (!base) {
 102                 err = -ENOMEM;
 103                 goto no_mem;
 104         }
 105
 106         /*
 107          * look for CFI based flash parts fitted to this board
 108          */
 109         info->map.size          = size;
 110         info->map.bankwidth     = plat->width;
 111         info->map.phys          = res->start;
 112         info->map.virt          = base;
 113         info->map.name          = dev->dev.bus_id;
 114         info->map.set_vpp       = armflash_set_vpp;
 115
 116         simple_map_init(&info->map);
 117
 118         /*
 119          * Also, the CFI layer automatically works out what size
 120          * of chips we have, and does the necessary identification
 121          * for us automatically.
 122          */
 123         info->mtd = do_map_probe(plat->map_name, &info->map);
 124         if (!info->mtd) {
 125                 err = -ENXIO;
 126                 goto no_device;
 127         }
 128
 129         info->mtd->owner = THIS_MODULE;
 130
 131         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
 132         if (err > 0) {
 133                 err = add_mtd_partitions(info->mtd, info->parts, err);
 134                 if (err)
 135                         printk(KERN_ERR
 136                                "mtd partition registration failed: %d\n", err);
 137         }
 138
 139         if (err == 0)
 140                 platform_set_drvdata(dev, info);
 141
 142         /*
 143          * If we got an error, free all resources.
 144          */
 145         if (err < 0) {
 146                 if (info->mtd) {
 147                         del_mtd_partitions(info->mtd);
 148                         map_destroy(info->mtd);
 149                 }
 150                 kfree(info->parts);
 151
 152  no_device:
 153                 iounmap(base);
 154  no_mem:
 155                 release_mem_region(res->start, size);
 156  no_resource:
 157                 if (plat && plat->exit)
 158                         plat->exit();
 159                 kfree(info);
 160         }
 161  out:
 162         return err;
 163 }
 164
 165 static int armflash_remove(struct platform_device *dev)
 166 {
 167         struct armflash_info *info = platform_get_drvdata(dev);
 168
 169         platform_set_drvdata(dev, NULL);
 170
 171         if (info) {
 172                 if (info->mtd) {
 173                         del_mtd_partitions(info->mtd);
 174                         map_destroy(info->mtd);
 175                 }
 176                 kfree(info->parts);
 177
 178                 iounmap(info->map.virt);
 179                 release_resource(info->res);
 180                 kfree(info->res);
 181
 182                 if (info->plat && info->plat->exit)
 183                         info->plat->exit();
 184
 185                 kfree(info);
 186         }
 187
 188         return 0;
 189 }
 190
 191 static struct platform_driver armflash_driver = {
 192         .probe          = armflash_probe,
 193         .remove         = armflash_remove,
 194         .driver         = {
 195                 .name   = "armflash",
 196         },
 197 };
 198
 199 static int __init armflash_init(void)
 200 {
 201         return platform_driver_register(&armflash_driver);
 202 }
 203
 204 static void __exit armflash_exit(void)
 205 {
 206         platform_driver_unregister(&armflash_driver);
 207 }
 208
 209 module_init(armflash_init);
 210 module_exit(armflash_exit);
 211
 212 MODULE_AUTHOR("ARM Ltd");
 213 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
 214 MODULE_LICENSE("GPL");