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   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 ======================================================================*/
  26
  27 #include <linux/module.h>
  28 #include <linux/types.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/ioport.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/init.h>
  34
  35 #include <linux/mtd/mtd.h>
  36 #include <linux/mtd/map.h>
  37 #include <linux/mtd/partitions.h>
  38
  39 #include <asm/mach/flash.h>
  40 #include <mach/hardware.h>
  41 #include <asm/io.h>
  42 #include <asm/system.h>
  43
  44 #ifdef CONFIG_ARCH_P720T
  45 #define FLASH_BASE              (0x04000000)
  46 #define FLASH_SIZE              (64*1024*1024)
  47 #endif
  48
  49 struct armflash_info {
  50         struct flash_platform_data *plat;
  51         struct resource         *res;
  52         struct mtd_partition    *parts;
  53         struct mtd_info         *mtd;
  54         struct map_info         map;
  55 };
  56
  57 static void armflash_set_vpp(struct map_info *map, int on)
  58 {
  59         struct armflash_info *info = container_of(map, struct armflash_info, map);
  60
  61         if (info->plat && info->plat->set_vpp)
  62                 info->plat->set_vpp(on);
  63 }
  64
  65 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
  66
  67 static int armflash_probe(struct platform_device *dev)
  68 {
  69         struct flash_platform_data *plat = dev->dev.platform_data;
  70         struct resource *res = dev->resource;
  71         unsigned int size = res->end - res->start + 1;
  72         struct armflash_info *info;
  73         int err;
  74         void __iomem *base;
  75
  76         info = kzalloc(sizeof(struct armflash_info), GFP_KERNEL);
  77         if (!info) {
  78                 err = -ENOMEM;
  79                 goto out;
  80         }
  81
  82         info->plat = plat;
  83         if (plat && plat->init) {
  84                 err = plat->init();
  85                 if (err)
  86                         goto no_resource;
  87         }
  88
  89         info->res = request_mem_region(res->start, size, "armflash");
  90         if (!info->res) {
  91                 err = -EBUSY;
  92                 goto no_resource;
  93         }
  94
  95         base = ioremap(res->start, size);
  96         if (!base) {
  97                 err = -ENOMEM;
  98                 goto no_mem;
  99         }
 100
 101         /*
 102          * look for CFI based flash parts fitted to this board
 103          */
 104         info->map.size          = size;
 105         info->map.bankwidth     = plat->width;
 106         info->map.phys          = res->start;
 107         info->map.virt          = base;
 108         info->map.name          = dev_name(&dev->dev);
 109         info->map.set_vpp       = armflash_set_vpp;
 110
 111         simple_map_init(&info->map);
 112
 113         /*
 114          * Also, the CFI layer automatically works out what size
 115          * of chips we have, and does the necessary identification
 116          * for us automatically.
 117          */
 118         info->mtd = do_map_probe(plat->map_name, &info->map);
 119         if (!info->mtd) {
 120                 err = -ENXIO;
 121                 goto no_device;
 122         }
 123
 124         info->mtd->owner = THIS_MODULE;
 125
 126         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
 127         if (err > 0) {
 128                 err = add_mtd_partitions(info->mtd, info->parts, err);
 129                 if (err)
 130                         printk(KERN_ERR
 131                                "mtd partition registration failed: %d\n", err);
 132         }
 133
 134         if (err == 0)
 135                 platform_set_drvdata(dev, info);
 136
 137         /*
 138          * If we got an error, free all resources.
 139          */
 140         if (err < 0) {
 141                 if (info->mtd) {
 142                         del_mtd_partitions(info->mtd);
 143                         map_destroy(info->mtd);
 144                 }
 145                 kfree(info->parts);
 146
 147  no_device:
 148                 iounmap(base);
 149  no_mem:
 150                 release_mem_region(res->start, size);
 151  no_resource:
 152                 if (plat && plat->exit)
 153                         plat->exit();
 154                 kfree(info);
 155         }
 156  out:
 157         return err;
 158 }
 159
 160 static int armflash_remove(struct platform_device *dev)
 161 {
 162         struct armflash_info *info = platform_get_drvdata(dev);
 163
 164         platform_set_drvdata(dev, NULL);
 165
 166         if (info) {
 167                 if (info->mtd) {
 168                         del_mtd_partitions(info->mtd);
 169                         map_destroy(info->mtd);
 170                 }
 171                 kfree(info->parts);
 172
 173                 iounmap(info->map.virt);
 174                 release_resource(info->res);
 175                 kfree(info->res);
 176
 177                 if (info->plat && info->plat->exit)
 178                         info->plat->exit();
 179
 180                 kfree(info);
 181         }
 182
 183         return 0;
 184 }
 185
 186 static struct platform_driver armflash_driver = {
 187         .probe          = armflash_probe,
 188         .remove         = armflash_remove,
 189         .driver         = {
 190                 .name   = "armflash",
 191                 .owner  = THIS_MODULE,
 192         },
 193 };
 194
 195 static int __init armflash_init(void)
 196 {
 197         return platform_driver_register(&armflash_driver);
 198 }
 199
 200 static void __exit armflash_exit(void)
 201 {
 202         platform_driver_unregister(&armflash_driver);
 203 }
 204
 205 module_init(armflash_init);
 206 module_exit(armflash_exit);
 207
 208 MODULE_AUTHOR("ARM Ltd");
 209 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
 210 MODULE_LICENSE("GPL");
 211 MODULE_ALIAS("platform:armflash");