180 lines
4.7 KiB
C
180 lines
4.7 KiB
C
/*
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* Flash memory support for various TI OMAP boards
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*
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* Copyright (C) 2001-2002 MontaVista Software Inc.
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* Copyright (C) 2003-2004 Texas Instruments
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* Copyright (C) 2004 Nokia Corporation
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*
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* Assembled using driver code copyright the companies above
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* and written by David Brownell, Jian Zhang <jzhang@ti.com>,
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* Tony Lindgren <tony@atomide.com> and others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/mach/flash.h>
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#include <asm/arch/tc.h>
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
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#endif
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struct omapflash_info {
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struct mtd_partition *parts;
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struct mtd_info *mtd;
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struct map_info map;
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};
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static void omap_set_vpp(struct map_info *map, int enable)
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{
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static int count;
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if (enable) {
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if (count++ == 0)
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OMAP_EMIFS_CONFIG_REG |= OMAP_EMIFS_CONFIG_WP;
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} else {
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if (count && (--count == 0))
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OMAP_EMIFS_CONFIG_REG &= ~OMAP_EMIFS_CONFIG_WP;
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}
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}
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static int __devinit omapflash_probe(struct platform_device *pdev)
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{
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int err;
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struct omapflash_info *info;
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struct flash_platform_data *pdata = pdev->dev.platform_data;
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struct resource *res = pdev->resource;
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unsigned long size = res->end - res->start + 1;
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info = kmalloc(sizeof(struct omapflash_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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memset(info, 0, sizeof(struct omapflash_info));
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if (!request_mem_region(res->start, size, "flash")) {
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err = -EBUSY;
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goto out_free_info;
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}
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info->map.virt = ioremap(res->start, size);
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if (!info->map.virt) {
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err = -ENOMEM;
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goto out_release_mem_region;
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}
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info->map.name = pdev->dev.bus_id;
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info->map.phys = res->start;
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info->map.size = size;
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info->map.bankwidth = pdata->width;
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info->map.set_vpp = omap_set_vpp;
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simple_map_init(&info->map);
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info->mtd = do_map_probe(pdata->map_name, &info->map);
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if (!info->mtd) {
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err = -EIO;
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goto out_iounmap;
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}
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info->mtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
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if (err > 0)
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add_mtd_partitions(info->mtd, info->parts, err);
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else if (err < 0 && pdata->parts)
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add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
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else
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#endif
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add_mtd_device(info->mtd);
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platform_set_drvdata(pdev, info);
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return 0;
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out_iounmap:
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iounmap(info->map.virt);
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out_release_mem_region:
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release_mem_region(res->start, size);
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out_free_info:
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kfree(info);
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return err;
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}
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static int __devexit omapflash_remove(struct platform_device *pdev)
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{
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struct omapflash_info *info = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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if (info) {
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if (info->parts) {
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del_mtd_partitions(info->mtd);
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kfree(info->parts);
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} else
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del_mtd_device(info->mtd);
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map_destroy(info->mtd);
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release_mem_region(info->map.phys, info->map.size);
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iounmap((void __iomem *) info->map.virt);
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kfree(info);
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}
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return 0;
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}
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static struct platform_driver omapflash_driver = {
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.probe = omapflash_probe,
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.remove = __devexit_p(omapflash_remove),
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.driver = {
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.name = "omapflash",
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},
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};
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static int __init omapflash_init(void)
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{
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return platform_driver_register(&omapflash_driver);
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}
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static void __exit omapflash_exit(void)
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{
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platform_driver_unregister(&omapflash_driver);
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}
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module_init(omapflash_init);
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module_exit(omapflash_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
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