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