drivers/mtd/maps/omap_nor.c

   1 /*
   2  * Flash memory support for various TI OMAP boards
   3  *
   4  * Copyright (C) 2001-2002 MontaVista Software Inc.
   5  * Copyright (C) 2003-2004 Texas Instruments
   6  * Copyright (C) 2004 Nokia Corporation
   7  *
   8  *      Assembled using driver code copyright the companies above
   9  *      and written by David Brownell, Jian Zhang <jzhang@ti.com>,
  10  *      Tony Lindgren <tony@atomide.com> and others.
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  20  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * You should have received a copy of the  GNU General Public License along
  29  * with this program; if not, write  to the Free Software Foundation, Inc.,
  30  * 675 Mass Ave, Cambridge, MA 02139, USA.
  31  */
  32
  33 #include <linux/platform_device.h>
  34 #include <linux/module.h>
  35 #include <linux/types.h>
  36 #include <linux/kernel.h>
  37 #include <linux/init.h>
  38 #include <linux/ioport.h>
  39 #include <linux/slab.h>
  40
  41 #include <linux/mtd/mtd.h>
  42 #include <linux/mtd/map.h>
  43 #include <linux/mtd/partitions.h>
  44
  45 #include <asm/io.h>
  46 #include <asm/hardware.h>
  47 #include <asm/mach/flash.h>
  48 #include <asm/arch/tc.h>
  49
  50 #ifdef CONFIG_MTD_PARTITIONS
  51 static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
  52 #endif
  53
  54 struct omapflash_info {
  55         struct mtd_partition    *parts;
  56         struct mtd_info         *mtd;
  57         struct map_info         map;
  58 };
  59
  60 static void omap_set_vpp(struct map_info *map, int enable)
  61 {
  62         static int      count;
  63
  64         if (enable) {
  65                 if (count++ == 0)
  66                         OMAP_EMIFS_CONFIG_REG |= OMAP_EMIFS_CONFIG_WP;
  67         } else {
  68                 if (count && (--count == 0))
  69                         OMAP_EMIFS_CONFIG_REG &= ~OMAP_EMIFS_CONFIG_WP;
  70         }
  71 }
  72
  73 static int __devinit omapflash_probe(struct device *dev)
  74 {
  75         int err;
  76         struct omapflash_info *info;
  77         struct platform_device *pdev = to_platform_device(dev);
  78         struct flash_platform_data *pdata = pdev->dev.platform_data;
  79         struct resource *res = pdev->resource;
  80         unsigned long size = res->end - res->start + 1;
  81
  82         info = kmalloc(sizeof(struct omapflash_info), GFP_KERNEL);
  83         if (!info)
  84                 return -ENOMEM;
  85
  86         memset(info, 0, sizeof(struct omapflash_info));
  87
  88         if (!request_mem_region(res->start, size, "flash")) {
  89                 err = -EBUSY;
  90                 goto out_free_info;
  91         }
  92
  93         info->map.virt          = ioremap(res->start, size);
  94         if (!info->map.virt) {
  95                 err = -ENOMEM;
  96                 goto out_release_mem_region;
  97         }
  98         info->map.name          = pdev->dev.bus_id;
  99         info->map.phys          = res->start;
 100         info->map.size          = size;
 101         info->map.bankwidth     = pdata->width;
 102         info->map.set_vpp       = omap_set_vpp;
 103
 104         simple_map_init(&info->map);
 105         info->mtd = do_map_probe(pdata->map_name, &info->map);
 106         if (!info->mtd) {
 107                 err = -EIO;
 108                 goto out_iounmap;
 109         }
 110         info->mtd->owner = THIS_MODULE;
 111
 112 #ifdef CONFIG_MTD_PARTITIONS
 113         err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
 114         if (err > 0)
 115                 add_mtd_partitions(info->mtd, info->parts, err);
 116         else if (err < 0 && pdata->parts)
 117                 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
 118         else
 119 #endif
 120                 add_mtd_device(info->mtd);
 121
 122         dev_set_drvdata(&pdev->dev, info);
 123
 124         return 0;
 125
 126 out_iounmap:
 127         iounmap(info->map.virt);
 128 out_release_mem_region:
 129         release_mem_region(res->start, size);
 130 out_free_info:
 131         kfree(info);
 132
 133         return err;
 134 }
 135
 136 static int __devexit omapflash_remove(struct device *dev)
 137 {
 138         struct platform_device *pdev = to_platform_device(dev);
 139         struct omapflash_info *info = dev_get_drvdata(&pdev->dev);
 140
 141         dev_set_drvdata(&pdev->dev, NULL);
 142
 143         if (info) {
 144                 if (info->parts) {
 145                         del_mtd_partitions(info->mtd);
 146                         kfree(info->parts);
 147                 } else
 148                         del_mtd_device(info->mtd);
 149                 map_destroy(info->mtd);
 150                 release_mem_region(info->map.phys, info->map.size);
 151                 iounmap((void __iomem *) info->map.virt);
 152                 kfree(info);
 153         }
 154
 155         return 0;
 156 }
 157
 158 static struct device_driver omapflash_driver = {
 159         .name   = "omapflash",
 160         .bus    = &platform_bus_type,
 161         .probe  = omapflash_probe,
 162         .remove = __devexit_p(omapflash_remove),
 163 };
 164
 165 static int __init omapflash_init(void)
 166 {
 167         return driver_register(&omapflash_driver);
 168 }
 169
 170 static void __exit omapflash_exit(void)
 171 {
 172         driver_unregister(&omapflash_driver);
 173 }
 174
 175 module_init(omapflash_init);
 176 module_exit(omapflash_exit);
 177
 178 MODULE_LICENSE("GPL");
 179 MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
 180