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 1.2 2005/01/18 11:13:47 bjd 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
  37 #include <linux/mtd/mtd.h>
  38 #include <linux/mtd/map.h>
  39 #include <linux/mtd/partitions.h>
  40
  41 #include <asm/io.h>
  42 #include <asm/mach-types.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 struct bast_flash_info *to_bast_info(struct device *dev)
  67 {
  68         return (struct bast_flash_info *)dev_get_drvdata(dev);
  69 }
  70
  71 static void bast_flash_setrw(int to)
  72 {
  73         unsigned int val;
  74         unsigned long flags;
  75
  76         local_irq_save(flags);
  77         val = __raw_readb(BAST_VA_CTRL3);
  78
  79         if (to)
  80                 val |= BAST_CPLD_CTRL3_ROMWEN;
  81         else
  82                 val &= ~BAST_CPLD_CTRL3_ROMWEN;
  83
  84         pr_debug("new cpld ctrl3=%02x\n", val);
  85
  86         __raw_writeb(val, BAST_VA_CTRL3);
  87         local_irq_restore(flags);
  88 }
  89
  90 static int bast_flash_remove(struct device *dev)
  91 {
  92         struct bast_flash_info *info = to_bast_info(dev);
  93
  94         dev_set_drvdata(dev, NULL);
  95
  96         if (info == NULL)
  97                 return 0;
  98
  99         if (info->map.virt != NULL)
 100                 iounmap(info->map.virt);
 101
 102         if (info->mtd) {
 103                 del_mtd_partitions(info->mtd);
 104                 map_destroy(info->mtd);
 105         }
 106
 107         if (info->partitions)
 108                 kfree(info->partitions);
 109
 110         if (info->area) {
 111                 release_resource(info->area);
 112                 kfree(info->area);
 113         }
 114
 115         kfree(info);
 116
 117         return 0;
 118 }
 119
 120 static int bast_flash_probe(struct device *dev)
 121 {
 122         struct platform_device *pdev = to_platform_device(dev);
 123         struct bast_flash_info *info;
 124         struct resource *res;
 125         int err = 0;
 126
 127         info = kmalloc(sizeof(*info), GFP_KERNEL);
 128         if (info == NULL) {
 129                 printk(KERN_ERR PFX "no memory for flash info\n");
 130                 err = -ENOMEM;
 131                 goto exit_error;
 132         }
 133
 134         memzero(info, sizeof(*info));
 135         dev_set_drvdata(dev, info);
 136
 137         res = pdev->resource;  /* assume that the flash has one resource */
 138
 139         info->map.phys = res->start;
 140         info->map.size = res->end - res->start + 1;
 141         info->map.name = dev->bus_id;
 142         info->map.bankwidth = 2;
 143
 144         if (info->map.size > AREA_MAXSIZE)
 145                 info->map.size = AREA_MAXSIZE;
 146
 147         pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
 148                  info->map.phys, info->map.size);
 149
 150         info->area = request_mem_region(res->start, info->map.size,
 151                                         pdev->name);
 152         if (info->area == NULL) {
 153                 printk(KERN_ERR PFX "cannot reserve flash memory region\n");
 154                 err = -ENOENT;
 155                 goto exit_error;
 156         }
 157
 158         info->map.virt = ioremap(res->start, info->map.size);
 159         pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
 160
 161         if (info->map.virt == 0) {
 162                 printk(KERN_ERR PFX "failed to ioremap() region\n");
 163                 err = -EIO;
 164                 goto exit_error;
 165         }
 166
 167         simple_map_init(&info->map);
 168
 169         /* enable the write to the flash area */
 170
 171         bast_flash_setrw(1);
 172
 173         /* probe for the device(s) */
 174
 175         info->mtd = do_map_probe("jedec_probe", &info->map);
 176         if (info->mtd == NULL)
 177                 info->mtd = do_map_probe("cfi_probe", &info->map);
 178
 179         if (info->mtd == NULL) {
 180                 printk(KERN_ERR PFX "map_probe() failed\n");
 181                 err = -ENXIO;
 182                 goto exit_error;
 183         }
 184
 185         /* mark ourselves as the owner */
 186         info->mtd->owner = THIS_MODULE;
 187
 188         err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
 189         if (err > 0) {
 190                 err = add_mtd_partitions(info->mtd, info->partitions, err);
 191                 if (err)
 192                         printk(KERN_ERR PFX "cannot add/parse partitions\n");
 193         } else {
 194                 err = add_mtd_device(info->mtd);
 195         }
 196
 197         if (err == 0)
 198                 return 0;
 199
 200         /* fall through to exit error */
 201
 202  exit_error:
 203         bast_flash_remove(dev);
 204         return err;
 205 }
 206
 207 static struct device_driver bast_flash_driver = {
 208         .name           = "bast-nor",
 209         .bus            = &platform_bus_type,
 210         .probe          = bast_flash_probe,
 211         .remove         = bast_flash_remove,
 212 };
 213
 214 static int __init bast_flash_init(void)
 215 {
 216         printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
 217         return driver_register(&bast_flash_driver);
 218 }
 219
 220 static void __exit bast_flash_exit(void)
 221 {
 222         driver_unregister(&bast_flash_driver);
 223 }
 224
 225 module_init(bast_flash_init);
 226 module_exit(bast_flash_exit);
 227
 228 MODULE_LICENSE("GPL");
 229 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 230 MODULE_DESCRIPTION("BAST MTD Map driver");