drivers/mtd/maps/bast-flash.c

   1 /* linux/drivers/mtd/maps/bast_flash.c
   2  *
   3  * Copyright (c) 2004 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  *
  11  * $Id: bast-flash.c,v 1.1 2004/09/21 14:29:04 bjd Exp $
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26 */
  27
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/init.h>
  31 #include <linux/kernel.h>
  32 #include <linux/string.h>
  33 #include <linux/ioport.h>
  34 #include <linux/device.h>
  35
  36 #include <linux/mtd/mtd.h>
  37 #include <linux/mtd/map.h>
  38 #include <linux/mtd/partitions.h>
  39
  40 #include <asm/io.h>
  41 #include <asm/mach-types.h>
  42 #include <asm/mach/flash.h>
  43
  44 #include <asm/arch/map.h>
  45 #include <asm/arch/bast-map.h>
  46 #include <asm/arch/bast-cpld.h>
  47
  48 #ifdef CONFIG_MTD_BAST_MAXSIZE
  49 #define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * (1024*1024))
  50 #else
  51 #define AREA_MAXSIZE (32*1024*1024)
  52 #endif
  53
  54 #define PFX "bast-flash: "
  55
  56 struct bast_flash_info {
  57         struct mtd_info         *mtd;
  58         struct map_info          map;
  59         struct mtd_partition    *partitions;
  60         struct resource         *area;
  61 };
  62
  63 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  64
  65 static struct bast_flash_info *to_bast_info(struct device *dev)
  66 {
  67         return (struct bast_flash_info *)dev_get_drvdata(dev);
  68 }
  69
  70 static void bast_flash_setrw(int to)
  71 {
  72         unsigned int val;
  73         unsigned long flags;
  74
  75         local_irq_save(flags);
  76         val = __raw_readb(BAST_VA_CTRL3);
  77
  78         if (to)
  79                 val |= BAST_CPLD_CTRL3_ROMWEN;
  80         else
  81                 val &= ~BAST_CPLD_CTRL3_ROMWEN;
  82
  83         pr_debug("new cpld ctrl3=%02x\n", val);
  84
  85         __raw_writeb(val, BAST_VA_CTRL3);
  86         local_irq_restore(flags);
  87 }
  88
  89 static int bast_flash_remove(struct device *dev)
  90 {
  91         struct bast_flash_info *info = to_bast_info(dev);
  92
  93         dev_set_drvdata(dev, NULL);
  94
  95         if (info == NULL)
  96                 return 0;
  97
  98         if (info->map.virt != NULL)
  99                 iounmap(info->map.virt);
 100
 101         if (info->mtd) {
 102                 del_mtd_partitions(info->mtd);
 103                 map_destroy(info->mtd);
 104         }
 105
 106         if (info->partitions)
 107                 kfree(info->partitions);
 108
 109         if (info->area) {
 110                 release_resource(info->area);
 111                 kfree(info->area);
 112         }
 113
 114         kfree(info);
 115
 116         return 0;
 117 }
 118
 119 static int bast_flash_probe(struct device *dev)
 120 {
 121         struct platform_device *pdev = to_platform_device(dev);
 122         struct bast_flash_info *info;
 123         struct resource *res;
 124         int err = 0;
 125
 126         info = kmalloc(sizeof(*info), GFP_KERNEL);
 127         if (info == NULL) {
 128                 printk(KERN_ERR PFX "no memory for flash info\n");
 129                 err = -ENOMEM;
 130                 goto exit_error;
 131         }
 132
 133         memzero(info, sizeof(*info));
 134         dev_set_drvdata(dev, info);
 135
 136         res = pdev->resource;  /* assume that the flash has one resource */
 137
 138         info->map.phys = res->start;
 139         info->map.size = res->end - res->start + 1;
 140         info->map.name = dev->bus_id;
 141         info->map.bankwidth = 2;
 142
 143         if (info->map.size > AREA_MAXSIZE)
 144                 info->map.size = AREA_MAXSIZE;
 145
 146         pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
 147                  info->map.phys, info->map.size);
 148
 149         info->area = request_mem_region(res->start, info->map.size,
 150                                         pdev->name);
 151         if (info->area == NULL) {
 152                 printk(KERN_ERR PFX "cannot reserve flash memory region\n");
 153                 err = -ENOENT;
 154                 goto exit_error;
 155         }
 156
 157         info->map.virt = ioremap(res->start, info->map.size);
 158         pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
 159
 160         if (info->map.virt == 0) {
 161                 printk(KERN_ERR PFX "failed to ioremap() region\n");
 162                 err = -EIO;
 163                 goto exit_error;
 164         }
 165
 166         simple_map_init(&info->map);
 167
 168         /* enable the write to the flash area */
 169
 170         bast_flash_setrw(1);
 171
 172         /* probe for the device(s) */
 173
 174         info->mtd = do_map_probe("jedec_probe", &info->map);
 175         if (info->mtd == NULL)
 176                 info->mtd = do_map_probe("cfi_probe", &info->map);
 177
 178         if (info->mtd == NULL) {
 179                 printk(KERN_ERR PFX "map_probe() failed\n");
 180                 err = -ENXIO;
 181                 goto exit_error;
 182         }
 183
 184         /* mark ourselves as the owner */
 185         info->mtd->owner = THIS_MODULE;
 186
 187         err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
 188         if (err > 0) {
 189                 err = add_mtd_partitions(info->mtd, info->partitions, err);
 190                 if (err)
 191                         printk(KERN_ERR PFX "cannot add/parse partitions\n");
 192         }
 193
 194         if (err == 0)
 195                 return 0;
 196
 197         /* fall through to exit error */
 198
 199  exit_error:
 200         bast_flash_remove(dev);
 201         return err;
 202 }
 203
 204 static struct device_driver bast_flash_driver = {
 205         .name           = "bast-nor",
 206         .bus            = &platform_bus_type,
 207         .probe          = bast_flash_probe,
 208         .remove         = bast_flash_remove,
 209 };
 210
 211 static int __init bast_flash_init(void)
 212 {
 213         printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
 214         return driver_register(&bast_flash_driver);
 215 }
 216
 217 static void __exit bast_flash_exit(void)
 218 {
 219         driver_unregister(&bast_flash_driver);
 220 }
 221
 222 module_init(bast_flash_init);
 223 module_exit(bast_flash_exit);
 224
 225 MODULE_LICENSE("GPL");
 226 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 227 MODULE_DESCRIPTION("BAST MTD Map driver");