320 lines
7.2 KiB
C
320 lines
7.2 KiB
C
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/*======================================================================
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drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver
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Copyright (C) 2000 ARM Limited
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Copyright (C) 2003 Deep Blue Solutions Ltd.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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This is access code for flashes using ARM's flash partitioning
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standards.
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======================================================================*/
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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/slab.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/io.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 <linux/mtd/concat.h>
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#include <asm/mach/flash.h>
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#include <mach/hardware.h>
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#include <asm/system.h>
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struct armflash_subdev_info {
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char *name;
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struct mtd_info *mtd;
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struct map_info map;
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struct flash_platform_data *plat;
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};
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struct armflash_info {
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struct resource *res;
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struct mtd_partition *parts;
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struct mtd_info *mtd;
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int nr_subdev;
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struct armflash_subdev_info subdev[0];
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};
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static void armflash_set_vpp(struct map_info *map, int on)
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{
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struct armflash_subdev_info *info =
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container_of(map, struct armflash_subdev_info, map);
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if (info->plat && info->plat->set_vpp)
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info->plat->set_vpp(on);
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}
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static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
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static int armflash_subdev_probe(struct armflash_subdev_info *subdev,
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struct resource *res)
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{
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struct flash_platform_data *plat = subdev->plat;
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resource_size_t size = res->end - res->start + 1;
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void __iomem *base;
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int err = 0;
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if (!request_mem_region(res->start, size, subdev->name)) {
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err = -EBUSY;
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goto out;
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}
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base = ioremap(res->start, size);
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if (!base) {
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err = -ENOMEM;
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goto no_mem;
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}
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/*
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* look for CFI based flash parts fitted to this board
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*/
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subdev->map.size = size;
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subdev->map.bankwidth = plat->width;
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subdev->map.phys = res->start;
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subdev->map.virt = base;
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subdev->map.name = subdev->name;
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subdev->map.set_vpp = armflash_set_vpp;
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simple_map_init(&subdev->map);
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/*
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* Also, the CFI layer automatically works out what size
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* of chips we have, and does the necessary identification
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* for us automatically.
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*/
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subdev->mtd = do_map_probe(plat->map_name, &subdev->map);
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if (!subdev->mtd) {
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err = -ENXIO;
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goto no_device;
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}
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subdev->mtd->owner = THIS_MODULE;
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/* Successful? */
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if (err == 0)
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return err;
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if (subdev->mtd)
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map_destroy(subdev->mtd);
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no_device:
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iounmap(base);
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no_mem:
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release_mem_region(res->start, size);
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out:
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return err;
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}
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static void armflash_subdev_remove(struct armflash_subdev_info *subdev)
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{
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if (subdev->mtd)
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map_destroy(subdev->mtd);
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if (subdev->map.virt)
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iounmap(subdev->map.virt);
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kfree(subdev->name);
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subdev->name = NULL;
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release_mem_region(subdev->map.phys, subdev->map.size);
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}
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static int armflash_probe(struct platform_device *dev)
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{
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struct flash_platform_data *plat = dev->dev.platform_data;
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unsigned int size;
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struct armflash_info *info;
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int i, nr, err;
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/* Count the number of devices */
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for (nr = 0; ; nr++)
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if (!platform_get_resource(dev, IORESOURCE_MEM, nr))
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break;
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if (nr == 0) {
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err = -ENODEV;
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goto out;
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}
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size = sizeof(struct armflash_info) +
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sizeof(struct armflash_subdev_info) * nr;
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info = kzalloc(size, GFP_KERNEL);
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if (!info) {
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err = -ENOMEM;
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goto out;
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}
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if (plat && plat->init) {
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err = plat->init();
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if (err)
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goto no_resource;
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}
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for (i = 0; i < nr; i++) {
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struct armflash_subdev_info *subdev = &info->subdev[i];
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struct resource *res;
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res = platform_get_resource(dev, IORESOURCE_MEM, i);
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if (!res)
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break;
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if (nr == 1)
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/* No MTD concatenation, just use the default name */
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subdev->name = kstrdup(dev_name(&dev->dev), GFP_KERNEL);
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else
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subdev->name = kasprintf(GFP_KERNEL, "%s-%d",
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dev_name(&dev->dev), i);
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if (!subdev->name) {
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err = -ENOMEM;
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break;
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}
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subdev->plat = plat;
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err = armflash_subdev_probe(subdev, res);
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if (err) {
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kfree(subdev->name);
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subdev->name = NULL;
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break;
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}
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}
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info->nr_subdev = i;
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if (err)
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goto subdev_err;
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if (info->nr_subdev == 1)
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info->mtd = info->subdev[0].mtd;
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else if (info->nr_subdev > 1) {
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#ifdef CONFIG_MTD_CONCAT
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struct mtd_info *cdev[info->nr_subdev];
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/*
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* We detected multiple devices. Concatenate them together.
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*/
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for (i = 0; i < info->nr_subdev; i++)
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cdev[i] = info->subdev[i].mtd;
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info->mtd = mtd_concat_create(cdev, info->nr_subdev,
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dev_name(&dev->dev));
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if (info->mtd == NULL)
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err = -ENXIO;
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#else
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printk(KERN_ERR "armflash: multiple devices found but "
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"MTD concat support disabled.\n");
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err = -ENXIO;
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#endif
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}
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if (err < 0)
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goto cleanup;
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err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
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if (err > 0) {
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err = add_mtd_partitions(info->mtd, info->parts, err);
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if (err)
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printk(KERN_ERR
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"mtd partition registration failed: %d\n", err);
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}
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if (err == 0) {
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platform_set_drvdata(dev, info);
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return err;
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}
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/*
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* We got an error, free all resources.
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*/
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cleanup:
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if (info->mtd) {
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del_mtd_partitions(info->mtd);
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#ifdef CONFIG_MTD_CONCAT
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if (info->mtd != info->subdev[0].mtd)
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mtd_concat_destroy(info->mtd);
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#endif
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}
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kfree(info->parts);
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subdev_err:
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for (i = info->nr_subdev - 1; i >= 0; i--)
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armflash_subdev_remove(&info->subdev[i]);
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no_resource:
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if (plat && plat->exit)
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plat->exit();
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kfree(info);
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out:
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return err;
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}
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static int armflash_remove(struct platform_device *dev)
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{
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struct armflash_info *info = platform_get_drvdata(dev);
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struct flash_platform_data *plat = dev->dev.platform_data;
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int i;
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platform_set_drvdata(dev, NULL);
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if (info) {
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if (info->mtd) {
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del_mtd_partitions(info->mtd);
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#ifdef CONFIG_MTD_CONCAT
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if (info->mtd != info->subdev[0].mtd)
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mtd_concat_destroy(info->mtd);
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#endif
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}
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kfree(info->parts);
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for (i = info->nr_subdev - 1; i >= 0; i--)
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armflash_subdev_remove(&info->subdev[i]);
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if (plat && plat->exit)
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plat->exit();
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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 armflash_driver = {
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.probe = armflash_probe,
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.remove = armflash_remove,
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.driver = {
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.name = "armflash",
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.owner = THIS_MODULE,
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},
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};
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static int __init armflash_init(void)
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{
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return platform_driver_register(&armflash_driver);
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}
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static void __exit armflash_exit(void)
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{
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platform_driver_unregister(&armflash_driver);
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}
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module_init(armflash_init);
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module_exit(armflash_exit);
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MODULE_AUTHOR("ARM Ltd");
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MODULE_DESCRIPTION("ARM Integrator CFI map driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:armflash");
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