711fdf627c
This patch adds support for generic platform NAND driver. Updated after tglx's review/discussion in IRC #mtd channel. Signed-off-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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* Generic NAND driver
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*
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* Author: Vitaly Wool <vitalywool@gmail.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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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.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/nand.h>
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#include <linux/mtd/partitions.h>
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struct plat_nand_data {
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struct nand_chip chip;
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struct mtd_info mtd;
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void __iomem *io_base;
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#ifdef CONFIG_MTD_PARTITIONS
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int nr_parts;
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struct mtd_partition *parts;
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#endif
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};
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/*
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* Probe for the NAND device.
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*/
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static int __init plat_nand_probe(struct platform_device *pdev)
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{
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struct platform_nand_data *pdata = pdev->dev.platform_data;
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struct plat_nand_data *data;
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int res = 0;
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/* Allocate memory for the device structure (and zero it) */
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data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
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if (!data) {
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dev_err(&pdev->dev, "failed to allocate device structure.\n");
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return -ENOMEM;
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}
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data->io_base = ioremap(pdev->resource[0].start,
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pdev->resource[0].end - pdev->resource[0].start + 1);
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if (data->io_base == NULL) {
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dev_err(&pdev->dev, "ioremap failed\n");
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kfree(data);
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return -EIO;
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}
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data->chip.priv = &data;
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data->mtd.priv = &data->chip;
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data->mtd.owner = THIS_MODULE;
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data->chip.IO_ADDR_R = data->io_base;
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data->chip.IO_ADDR_W = data->io_base;
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data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
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data->chip.dev_ready = pdata->ctrl.dev_ready;
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data->chip.select_chip = pdata->ctrl.select_chip;
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data->chip.chip_delay = pdata->chip.chip_delay;
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data->chip.options |= pdata->chip.options;
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data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
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data->chip.ecc.layout = pdata->chip.ecclayout;
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data->chip.ecc.mode = NAND_ECC_SOFT;
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platform_set_drvdata(pdev, data);
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/* Scan to find existance of the device */
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if (nand_scan(&data->mtd, 1)) {
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res = -ENXIO;
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goto out;
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}
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#ifdef CONFIG_MTD_PARTITIONS
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if (pdata->chip.part_probe_types) {
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res = parse_mtd_partitions(&data->mtd,
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pdata->chip.part_probe_types,
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&data->parts, 0);
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if (res > 0) {
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add_mtd_partitions(&data->mtd, data->parts, res);
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return 0;
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}
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}
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if (pdata->chip.partitions) {
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data->parts = pdata->chip.partitions;
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res = add_mtd_partitions(&data->mtd, data->parts,
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pdata->chip.nr_partitions);
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} else
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#endif
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res = add_mtd_device(&data->mtd);
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if (!res)
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return res;
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nand_release(&data->mtd);
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out:
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platform_set_drvdata(pdev, NULL);
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iounmap(data->io_base);
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kfree(data);
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return res;
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}
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/*
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* Remove a NAND device.
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*/
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static int __devexit plat_nand_remove(struct platform_device *pdev)
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{
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struct plat_nand_data *data = platform_get_drvdata(pdev);
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struct platform_nand_data *pdata = pdev->dev.platform_data;
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nand_release(&data->mtd);
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#ifdef CONFIG_MTD_PARTITIONS
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if (data->parts && data->parts != pdata->chip.partitions)
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kfree(data->parts);
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#endif
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iounmap(data->io_base);
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kfree(data);
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return 0;
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}
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static struct platform_driver plat_nand_driver = {
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.probe = plat_nand_probe,
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.remove = plat_nand_remove,
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.driver = {
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.name = "gen_nand",
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.owner = THIS_MODULE,
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},
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};
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static int __init plat_nand_init(void)
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{
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return platform_driver_register(&plat_nand_driver);
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}
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static void __exit plat_nand_exit(void)
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{
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platform_driver_unregister(&plat_nand_driver);
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}
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module_init(plat_nand_init);
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module_exit(plat_nand_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Vitaly Wool");
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MODULE_DESCRIPTION("Simple generic NAND driver");
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