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/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/mtd/mtd.h>
  40 #include <linux/mtd/map.h>
  41 #include <linux/mtd/partitions.h>
  42
  43 #include <asm/io.h>
  44 #include <asm/hardware.h>
  45 #include <asm/mach-types.h>
  46 #include <asm/mach/flash.h>
  47 #include <asm/arch/tc.h>
  48
  49 #ifdef CONFIG_MTD_PARTITIONS
  50 static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
  51 #endif
  52
  53 struct omapflash_info {
  54         struct mtd_partition    *parts;
  55         struct mtd_info         *mtd;
  56         struct map_info         map;
  57 };
  58
  59 static void omap_set_vpp(struct map_info *map, int enable)
  60 {
  61         static int      count;
  62
  63         if (enable) {
  64                 if (count++ == 0)
  65                         OMAP_EMIFS_CONFIG_REG |= OMAP_EMIFS_CONFIG_WP;
  66         } else {
  67                 if (count && (--count == 0))
  68                         OMAP_EMIFS_CONFIG_REG &= ~OMAP_EMIFS_CONFIG_WP;
  69         }
  70 }
  71
  72 static int __devinit omapflash_probe(struct device *dev)
  73 {
  74         int err;
  75         struct omapflash_info *info;
  76         struct platform_device *pdev = to_platform_device(dev);
  77         struct flash_platform_data *pdata = pdev->dev.platform_data;
  78         struct resource *res = pdev->resource;
  79         unsigned long size = res->end - res->start + 1;
  80
  81         info = kmalloc(sizeof(struct omapflash_info), GFP_KERNEL);
  82         if (!info)
  83                 return -ENOMEM;
  84
  85         memset(info, 0, sizeof(struct omapflash_info));
  86
  87         if (!request_mem_region(res->start, size, "flash")) {
  88                 err = -EBUSY;
  89                 goto out_free_info;
  90         }
  91
  92         info->map.virt          = ioremap(res->start, size);
  93         if (!info->map.virt) {
  94                 err = -ENOMEM;
  95                 goto out_release_mem_region;
  96         }
  97         info->map.name          = pdev->dev.bus_id;
  98         info->map.phys          = res->start;
  99         info->map.size          = size;
 100         info->map.bankwidth     = pdata->width;
 101         info->map.set_vpp       = omap_set_vpp;
 102
 103         simple_map_init(&info->map);
 104         info->mtd = do_map_probe(pdata->map_name, &info->map);
 105         if (!info->mtd) {
 106                 err = -EIO;
 107                 goto out_iounmap;
 108         }
 109         info->mtd->owner = THIS_MODULE;
 110
 111 #ifdef CONFIG_MTD_PARTITIONS
 112         err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
 113         if (err > 0)
 114                 add_mtd_partitions(info->mtd, info->parts, err);
 115         else if (err < 0 && pdata->parts)
 116                 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
 117         else
 118 #endif
 119                 add_mtd_device(info->mtd);
 120
 121         dev_set_drvdata(&pdev->dev, info);
 122
 123         return 0;
 124
 125 out_iounmap:
 126         iounmap(info->map.virt);
 127 out_release_mem_region:
 128         release_mem_region(res->start, size);
 129 out_free_info:
 130         kfree(info);
 131
 132         return err;
 133 }
 134
 135 static int __devexit omapflash_remove(struct device *dev)
 136 {
 137         struct platform_device *pdev = to_platform_device(dev);
 138         struct omapflash_info *info = dev_get_drvdata(&pdev->dev);
 139
 140         dev_set_drvdata(&pdev->dev, NULL);
 141
 142         if (info) {
 143                 if (info->parts) {
 144                         del_mtd_partitions(info->mtd);
 145                         kfree(info->parts);
 146                 } else
 147                         del_mtd_device(info->mtd);
 148                 map_destroy(info->mtd);
 149                 release_mem_region(info->map.phys, info->map.size);
 150                 iounmap((void __iomem *) info->map.virt);
 151                 kfree(info);
 152         }
 153
 154         return 0;
 155 }
 156
 157 static struct device_driver omapflash_driver = {
 158         .name   = "omapflash",
 159         .bus    = &platform_bus_type,
 160         .probe  = omapflash_probe,
 161         .remove = __devexit_p(omapflash_remove),
 162 };
 163
 164 static int __init omapflash_init(void)
 165 {
 166         return driver_register(&omapflash_driver);
 167 }
 168
 169 static void __exit omapflash_exit(void)
 170 {
 171         driver_unregister(&omapflash_driver);
 172 }
 173
 174 module_init(omapflash_init);
 175 module_exit(omapflash_exit);
 176
 177 MODULE_LICENSE("GPL");
 178 MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
 179