152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
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/*
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* linux/drivers/mtd/onenand/generic.c
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*
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* Copyright (c) 2005 Samsung Electronics
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* Kyungmin Park <kyungmin.park@samsung.com>
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*
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* Overview:
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* This is a device driver for the OneNAND flash for generic boards.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/onenand.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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/*
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* Note: Driver name and platform data format have been updated!
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*
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* This version of the driver is named "onenand-flash" and takes struct
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* onenand_platform_data as platform data. The old ARM-specific version
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* with the name "onenand" used to take struct flash_platform_data.
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*/
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#define DRIVER_NAME "onenand-flash"
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probes[] = { "cmdlinepart", NULL, };
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#endif
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struct onenand_info {
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struct mtd_info mtd;
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struct mtd_partition *parts;
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struct onenand_chip onenand;
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};
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static int __devinit generic_onenand_probe(struct platform_device *pdev)
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{
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struct onenand_info *info;
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struct onenand_platform_data *pdata = pdev->dev.platform_data;
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struct resource *res = pdev->resource;
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unsigned long size = resource_size(res);
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int err;
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info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
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err = -EBUSY;
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goto out_free_info;
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}
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info->onenand.base = ioremap(res->start, size);
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if (!info->onenand.base) {
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err = -ENOMEM;
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goto out_release_mem_region;
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}
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info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
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info->onenand.irq = platform_get_irq(pdev, 0);
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info->mtd.name = dev_name(&pdev->dev);
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info->mtd.priv = &info->onenand;
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info->mtd.owner = THIS_MODULE;
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if (onenand_scan(&info->mtd, 1)) {
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err = -ENXIO;
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goto out_iounmap;
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}
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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 && 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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err = 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->onenand.base);
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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 generic_onenand_remove(struct platform_device *pdev)
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{
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struct onenand_info *info = platform_get_drvdata(pdev);
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struct resource *res = pdev->resource;
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unsigned long size = resource_size(res);
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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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else
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del_mtd_device(&info->mtd);
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onenand_release(&info->mtd);
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release_mem_region(res->start, size);
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iounmap(info->onenand.base);
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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 generic_onenand_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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.probe = generic_onenand_probe,
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.remove = __devexit_p(generic_onenand_remove),
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};
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MODULE_ALIAS(DRIVER_NAME);
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static int __init generic_onenand_init(void)
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{
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return platform_driver_register(&generic_onenand_driver);
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}
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static void __exit generic_onenand_exit(void)
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{
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platform_driver_unregister(&generic_onenand_driver);
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}
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module_init(generic_onenand_init);
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module_exit(generic_onenand_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
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MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
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