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 1.18 2004/11/01 13:26:15 rmk 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/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 device *_dev)
  71 {
  72         struct platform_device *dev = to_platform_device(_dev);
  73         struct flash_platform_data *plat = dev->dev.platform_data;
  74         struct resource *res = dev->resource;
  75         unsigned int size = res->end - res->start + 1;
  76         struct armflash_info *info;
  77         int err;
  78         void __iomem *base;
  79
  80         info = kmalloc(sizeof(struct armflash_info), GFP_KERNEL);
  81         if (!info) {
  82                 err = -ENOMEM;
  83                 goto out;
  84         }
  85
  86         memset(info, 0, sizeof(struct armflash_info));
  87
  88         info->plat = plat;
  89         if (plat && plat->init) {
  90                 err = plat->init();
  91                 if (err)
  92                         goto no_resource;
  93         }
  94
  95         info->res = request_mem_region(res->start, size, "armflash");
  96         if (!info->res) {
  97                 err = -EBUSY;
  98                 goto no_resource;
  99         }
 100
 101         base = ioremap(res->start, size);
 102         if (!base) {
 103                 err = -ENOMEM;
 104                 goto no_mem;
 105         }
 106
 107         /*
 108          * look for CFI based flash parts fitted to this board
 109          */
 110         info->map.size          = size;
 111         info->map.bankwidth     = plat->width;
 112         info->map.phys          = res->start;
 113         info->map.virt          = base;
 114         info->map.name          = dev->dev.bus_id;
 115         info->map.set_vpp       = armflash_set_vpp;
 116
 117         simple_map_init(&info->map);
 118
 119         /*
 120          * Also, the CFI layer automatically works out what size
 121          * of chips we have, and does the necessary identification
 122          * for us automatically.
 123          */
 124         info->mtd = do_map_probe(plat->map_name, &info->map);
 125         if (!info->mtd) {
 126                 err = -ENXIO;
 127                 goto no_device;
 128         }
 129
 130         info->mtd->owner = THIS_MODULE;
 131
 132         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
 133         if (err > 0) {
 134                 err = add_mtd_partitions(info->mtd, info->parts, err);
 135                 if (err)
 136                         printk(KERN_ERR
 137                                "mtd partition registration failed: %d\n", err);
 138         }
 139
 140         if (err == 0)
 141                 dev_set_drvdata(&dev->dev, info);
 142
 143         /*
 144          * If we got an error, free all resources.
 145          */
 146         if (err < 0) {
 147                 if (info->mtd) {
 148                         del_mtd_partitions(info->mtd);
 149                         map_destroy(info->mtd);
 150                 }
 151                 if (info->parts)
 152                         kfree(info->parts);
 153
 154  no_device:
 155                 iounmap(base);
 156  no_mem:
 157                 release_mem_region(res->start, size);
 158  no_resource:
 159                 if (plat && plat->exit)
 160                         plat->exit();
 161                 kfree(info);
 162         }
 163  out:
 164         return err;
 165 }
 166
 167 static int armflash_remove(struct device *_dev)
 168 {
 169         struct platform_device *dev = to_platform_device(_dev);
 170         struct armflash_info *info = dev_get_drvdata(&dev->dev);
 171
 172         dev_set_drvdata(&dev->dev, NULL);
 173
 174         if (info) {
 175                 if (info->mtd) {
 176                         del_mtd_partitions(info->mtd);
 177                         map_destroy(info->mtd);
 178                 }
 179                 if (info->parts)
 180                         kfree(info->parts);
 181
 182                 iounmap(info->map.virt);
 183                 release_resource(info->res);
 184                 kfree(info->res);
 185
 186                 if (info->plat && info->plat->exit)
 187                         info->plat->exit();
 188
 189                 kfree(info);
 190         }
 191
 192         return 0;
 193 }
 194
 195 static struct device_driver armflash_driver = {
 196         .name           = "armflash",
 197         .bus            = &platform_bus_type,
 198         .probe          = armflash_probe,
 199         .remove         = armflash_remove,
 200 };
 201
 202 static int __init armflash_init(void)
 203 {
 204         return driver_register(&armflash_driver);
 205 }
 206
 207 static void __exit armflash_exit(void)
 208 {
 209         driver_unregister(&armflash_driver);
 210 }
 211
 212 module_init(armflash_init);
 213 module_exit(armflash_exit);
 214
 215 MODULE_AUTHOR("ARM Ltd");
 216 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
 217 MODULE_LICENSE("GPL");