drivers/mtd/maps/bast-flash.c

   1 /* linux/drivers/mtd/maps/bast_flash.c
   2  *
   3  * Copyright (c) 2004-2005 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * Simtec Bast (EB2410ITX) NOR MTD Mapping driver
   7  *
   8  * Changelog:
   9  *      20-Sep-2004  BJD  Initial version
  10  *      17-Jan-2005  BJD  Add whole device if no partitions found
  11  *
  12  * $Id: bast-flash.c,v 1.5 2005/11/07 11:14:26 gleixner Exp $
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27 */
  28
  29 #include <linux/module.h>
  30 #include <linux/types.h>
  31 #include <linux/init.h>
  32 #include <linux/kernel.h>
  33 #include <linux/string.h>
  34 #include <linux/ioport.h>
  35 #include <linux/device.h>
  36 #include <linux/slab.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/mtd/mtd.h>
  39 #include <linux/mtd/map.h>
  40 #include <linux/mtd/partitions.h>
  41
  42 #include <asm/io.h>
  43 #include <asm/mach/flash.h>
  44
  45 #include <asm/arch/map.h>
  46 #include <asm/arch/bast-map.h>
  47 #include <asm/arch/bast-cpld.h>
  48
  49 #ifdef CONFIG_MTD_BAST_MAXSIZE
  50 #define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * SZ_1M)
  51 #else
  52 #define AREA_MAXSIZE (32 * SZ_1M)
  53 #endif
  54
  55 #define PFX "bast-flash: "
  56
  57 struct bast_flash_info {
  58         struct mtd_info         *mtd;
  59         struct map_info          map;
  60         struct mtd_partition    *partitions;
  61         struct resource         *area;
  62 };
  63
  64 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  65
  66 static void bast_flash_setrw(int to)
  67 {
  68         unsigned int val;
  69         unsigned long flags;
  70
  71         local_irq_save(flags);
  72         val = __raw_readb(BAST_VA_CTRL3);
  73
  74         if (to)
  75                 val |= BAST_CPLD_CTRL3_ROMWEN;
  76         else
  77                 val &= ~BAST_CPLD_CTRL3_ROMWEN;
  78
  79         pr_debug("new cpld ctrl3=%02x\n", val);
  80
  81         __raw_writeb(val, BAST_VA_CTRL3);
  82         local_irq_restore(flags);
  83 }
  84
  85 static int bast_flash_remove(struct platform_device *pdev)
  86 {
  87         struct bast_flash_info *info = platform_get_drvdata(pdev);
  88
  89         platform_set_drvdata(pdev, NULL);
  90
  91         if (info == NULL)
  92                 return 0;
  93
  94         if (info->map.virt != NULL)
  95                 iounmap(info->map.virt);
  96
  97         if (info->mtd) {
  98                 del_mtd_partitions(info->mtd);
  99                 map_destroy(info->mtd);
 100         }
 101
 102         kfree(info->partitions);
 103
 104         if (info->area) {
 105                 release_resource(info->area);
 106                 kfree(info->area);
 107         }
 108
 109         kfree(info);
 110
 111         return 0;
 112 }
 113
 114 static int bast_flash_probe(struct platform_device *pdev)
 115 {
 116         struct bast_flash_info *info;
 117         struct resource *res;
 118         int err = 0;
 119
 120         info = kmalloc(sizeof(*info), GFP_KERNEL);
 121         if (info == NULL) {
 122                 printk(KERN_ERR PFX "no memory for flash info\n");
 123                 err = -ENOMEM;
 124                 goto exit_error;
 125         }
 126
 127         memzero(info, sizeof(*info));
 128         platform_set_drvdata(pdev, info);
 129
 130         res = pdev->resource;  /* assume that the flash has one resource */
 131
 132         info->map.phys = res->start;
 133         info->map.size = res->end - res->start + 1;
 134         info->map.name = pdev->dev.bus_id;
 135         info->map.bankwidth = 2;
 136
 137         if (info->map.size > AREA_MAXSIZE)
 138                 info->map.size = AREA_MAXSIZE;
 139
 140         pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
 141                  info->map.phys, info->map.size);
 142
 143         info->area = request_mem_region(res->start, info->map.size,
 144                                         pdev->name);
 145         if (info->area == NULL) {
 146                 printk(KERN_ERR PFX "cannot reserve flash memory region\n");
 147                 err = -ENOENT;
 148                 goto exit_error;
 149         }
 150
 151         info->map.virt = ioremap(res->start, info->map.size);
 152         pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
 153
 154         if (info->map.virt == 0) {
 155                 printk(KERN_ERR PFX "failed to ioremap() region\n");
 156                 err = -EIO;
 157                 goto exit_error;
 158         }
 159
 160         simple_map_init(&info->map);
 161
 162         /* enable the write to the flash area */
 163
 164         bast_flash_setrw(1);
 165
 166         /* probe for the device(s) */
 167
 168         info->mtd = do_map_probe("jedec_probe", &info->map);
 169         if (info->mtd == NULL)
 170                 info->mtd = do_map_probe("cfi_probe", &info->map);
 171
 172         if (info->mtd == NULL) {
 173                 printk(KERN_ERR PFX "map_probe() failed\n");
 174                 err = -ENXIO;
 175                 goto exit_error;
 176         }
 177
 178         /* mark ourselves as the owner */
 179         info->mtd->owner = THIS_MODULE;
 180
 181         err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
 182         if (err > 0) {
 183                 err = add_mtd_partitions(info->mtd, info->partitions, err);
 184                 if (err)
 185                         printk(KERN_ERR PFX "cannot add/parse partitions\n");
 186         } else {
 187                 err = add_mtd_device(info->mtd);
 188         }
 189
 190         if (err == 0)
 191                 return 0;
 192
 193         /* fall through to exit error */
 194
 195  exit_error:
 196         bast_flash_remove(pdev);
 197         return err;
 198 }
 199
 200 static struct platform_driver bast_flash_driver = {
 201         .probe          = bast_flash_probe,
 202         .remove         = bast_flash_remove,
 203         .driver         = {
 204                 .name   = "bast-nor",
 205                 .owner  = THIS_MODULE,
 206         },
 207 };
 208
 209 static int __init bast_flash_init(void)
 210 {
 211         printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
 212         return platform_driver_register(&bast_flash_driver);
 213 }
 214
 215 static void __exit bast_flash_exit(void)
 216 {
 217         platform_driver_unregister(&bast_flash_driver);
 218 }
 219
 220 module_init(bast_flash_init);
 221 module_exit(bast_flash_exit);
 222
 223 MODULE_LICENSE("GPL");
 224 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 225 MODULE_DESCRIPTION("BAST MTD Map driver");