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 <mach/hardware.h>
  47 #include <asm/mach/flash.h>
  48 #include <mach/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         u32 l;
  64
  65         if (cpu_class_is_omap1()) {
  66                 if (enable) {
  67                         if (count++ == 0) {
  68                                 l = omap_readl(EMIFS_CONFIG);
  69                                 l |= OMAP_EMIFS_CONFIG_WP;
  70                                 omap_writel(l, EMIFS_CONFIG);
  71                         }
  72                 } else {
  73                         if (count && (--count == 0)) {
  74                                 l = omap_readl(EMIFS_CONFIG);
  75                                 l &= ~OMAP_EMIFS_CONFIG_WP;
  76                                 omap_writel(l, EMIFS_CONFIG);
  77                         }
  78                 }
  79         }
  80 }
  81
  82 static int __init omapflash_probe(struct platform_device *pdev)
  83 {
  84         int err;
  85         struct omapflash_info *info;
  86         struct flash_platform_data *pdata = pdev->dev.platform_data;
  87         struct resource *res = pdev->resource;
  88         unsigned long size = res->end - res->start + 1;
  89
  90         info = kzalloc(sizeof(struct omapflash_info), GFP_KERNEL);
  91         if (!info)
  92                 return -ENOMEM;
  93
  94         if (!request_mem_region(res->start, size, "flash")) {
  95                 err = -EBUSY;
  96                 goto out_free_info;
  97         }
  98
  99         info->map.virt          = ioremap(res->start, size);
 100         if (!info->map.virt) {
 101                 err = -ENOMEM;
 102                 goto out_release_mem_region;
 103         }
 104         info->map.name          = dev_name(&pdev->dev);
 105         info->map.phys          = res->start;
 106         info->map.size          = size;
 107         info->map.bankwidth     = pdata->width;
 108         info->map.set_vpp       = omap_set_vpp;
 109
 110         simple_map_init(&info->map);
 111         info->mtd = do_map_probe(pdata->map_name, &info->map);
 112         if (!info->mtd) {
 113                 err = -EIO;
 114                 goto out_iounmap;
 115         }
 116         info->mtd->owner = THIS_MODULE;
 117
 118         info->mtd->dev.parent = &pdev->dev;
 119
 120 #ifdef CONFIG_MTD_PARTITIONS
 121         err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
 122         if (err > 0)
 123                 add_mtd_partitions(info->mtd, info->parts, err);
 124         else if (err <= 0 && pdata->parts)
 125                 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
 126         else
 127 #endif
 128                 add_mtd_device(info->mtd);
 129
 130         platform_set_drvdata(pdev, info);
 131
 132         return 0;
 133
 134 out_iounmap:
 135         iounmap(info->map.virt);
 136 out_release_mem_region:
 137         release_mem_region(res->start, size);
 138 out_free_info:
 139         kfree(info);
 140
 141         return err;
 142 }
 143
 144 static int __exit omapflash_remove(struct platform_device *pdev)
 145 {
 146         struct omapflash_info *info = platform_get_drvdata(pdev);
 147
 148         platform_set_drvdata(pdev, NULL);
 149
 150         if (info) {
 151                 if (info->parts) {
 152                         del_mtd_partitions(info->mtd);
 153                         kfree(info->parts);
 154                 } else
 155                         del_mtd_device(info->mtd);
 156                 map_destroy(info->mtd);
 157                 release_mem_region(info->map.phys, info->map.size);
 158                 iounmap((void __iomem *) info->map.virt);
 159                 kfree(info);
 160         }
 161
 162         return 0;
 163 }
 164
 165 static struct platform_driver omapflash_driver = {
 166         .remove = __exit_p(omapflash_remove),
 167         .driver = {
 168                 .name   = "omapflash",
 169                 .owner  = THIS_MODULE,
 170         },
 171 };
 172
 173 static int __init omapflash_init(void)
 174 {
 175         return platform_driver_probe(&omapflash_driver, omapflash_probe);
 176 }
 177
 178 static void __exit omapflash_exit(void)
 179 {
 180         platform_driver_unregister(&omapflash_driver);
 181 }
 182
 183 module_init(omapflash_init);
 184 module_exit(omapflash_exit);
 185
 186 MODULE_LICENSE("GPL");
 187 MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
 188 MODULE_ALIAS("platform:omapflash");