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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2005 Samsung Electronics4 * Kyungmin Park <kyungmin.park@samsung.com>5 *6 * Overview:7 * This is a device driver for the OneNAND flash for generic boards.8 */9 10#include <linux/module.h>11#include <linux/slab.h>12#include <linux/platform_device.h>13#include <linux/mtd/mtd.h>14#include <linux/mtd/onenand.h>15#include <linux/mtd/partitions.h>16#include <linux/io.h>17 18/*19 * Note: Driver name and platform data format have been updated!20 *21 * This version of the driver is named "onenand-flash" and takes struct22 * onenand_platform_data as platform data. The old ARM-specific version23 * with the name "onenand" used to take struct flash_platform_data.24 */25#define DRIVER_NAME "onenand-flash"26 27struct onenand_info {28 struct mtd_info mtd;29 struct onenand_chip onenand;30};31 32static int generic_onenand_probe(struct platform_device *pdev)33{34 struct onenand_info *info;35 struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev);36 struct resource *res = pdev->resource;37 unsigned long size = resource_size(res);38 int err;39 40 info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);41 if (!info)42 return -ENOMEM;43 44 if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {45 err = -EBUSY;46 goto out_free_info;47 }48 49 info->onenand.base = ioremap(res->start, size);50 if (!info->onenand.base) {51 err = -ENOMEM;52 goto out_release_mem_region;53 }54 55 info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;56 57 err = platform_get_irq(pdev, 0);58 if (err < 0)59 goto out_iounmap;60 61 info->onenand.irq = err;62 63 info->mtd.dev.parent = &pdev->dev;64 info->mtd.priv = &info->onenand;65 66 if (onenand_scan(&info->mtd, 1)) {67 err = -ENXIO;68 goto out_iounmap;69 }70 71 err = mtd_device_register(&info->mtd, pdata ? pdata->parts : NULL,72 pdata ? pdata->nr_parts : 0);73 74 platform_set_drvdata(pdev, info);75 76 return 0;77 78out_iounmap:79 iounmap(info->onenand.base);80out_release_mem_region:81 release_mem_region(res->start, size);82out_free_info:83 kfree(info);84 85 return err;86}87 88static void generic_onenand_remove(struct platform_device *pdev)89{90 struct onenand_info *info = platform_get_drvdata(pdev);91 struct resource *res = pdev->resource;92 unsigned long size = resource_size(res);93 94 if (info) {95 onenand_release(&info->mtd);96 release_mem_region(res->start, size);97 iounmap(info->onenand.base);98 kfree(info);99 }100}101 102static struct platform_driver generic_onenand_driver = {103 .driver = {104 .name = DRIVER_NAME,105 },106 .probe = generic_onenand_probe,107 .remove_new = generic_onenand_remove,108};109 110module_platform_driver(generic_onenand_driver);111 112MODULE_LICENSE("GPL");113MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");114MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");115MODULE_ALIAS("platform:" DRIVER_NAME);116