| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005 Samsung Electronics |
| 3 | * Kyungmin Park <kyungmin.park@samsung.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Overview: |
| 10 | * This is a device driver for the OneNAND flash for generic boards. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/mtd/mtd.h> |
| 17 | #include <linux/mtd/onenand.h> |
| 18 | #include <linux/mtd/partitions.h> |
| 19 | #include <linux/io.h> |
| 20 | |
| 21 | /* |
| 22 | * Note: Driver name and platform data format have been updated! |
| 23 | * |
| 24 | * This version of the driver is named "onenand-flash" and takes struct |
| 25 | * onenand_platform_data as platform data. The old ARM-specific version |
| 26 | * with the name "onenand" used to take struct flash_platform_data. |
| 27 | */ |
| 28 | #define DRIVER_NAME "onenand-flash" |
| 29 | |
| 30 | struct onenand_info { |
| 31 | struct mtd_info mtd; |
| 32 | struct onenand_chip onenand; |
| 33 | }; |
| 34 | |
| 35 | static int generic_onenand_probe(struct platform_device *pdev) |
| 36 | { |
| 37 | struct onenand_info *info; |
| 38 | struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev); |
| 39 | struct resource *res = pdev->resource; |
| 40 | unsigned long size = resource_size(res); |
| 41 | int err; |
| 42 | |
| 43 | info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL); |
| 44 | if (!info) |
| 45 | return -ENOMEM; |
| 46 | |
| 47 | if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) { |
| 48 | err = -EBUSY; |
| 49 | goto out_free_info; |
| 50 | } |
| 51 | |
| 52 | info->onenand.base = ioremap(res->start, size); |
| 53 | if (!info->onenand.base) { |
| 54 | err = -ENOMEM; |
| 55 | goto out_release_mem_region; |
| 56 | } |
| 57 | |
| 58 | info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL; |
| 59 | info->onenand.irq = platform_get_irq(pdev, 0); |
| 60 | |
| 61 | info->mtd.dev.parent = &pdev->dev; |
| 62 | info->mtd.priv = &info->onenand; |
| 63 | |
| 64 | if (onenand_scan(&info->mtd, 1)) { |
| 65 | err = -ENXIO; |
| 66 | goto out_iounmap; |
| 67 | } |
| 68 | |
| 69 | err = mtd_device_register(&info->mtd, pdata ? pdata->parts : NULL, |
| 70 | pdata ? pdata->nr_parts : 0); |
| 71 | |
| 72 | platform_set_drvdata(pdev, info); |
| 73 | |
| 74 | return 0; |
| 75 | |
| 76 | out_iounmap: |
| 77 | iounmap(info->onenand.base); |
| 78 | out_release_mem_region: |
| 79 | release_mem_region(res->start, size); |
| 80 | out_free_info: |
| 81 | kfree(info); |
| 82 | |
| 83 | return err; |
| 84 | } |
| 85 | |
| 86 | static int generic_onenand_remove(struct platform_device *pdev) |
| 87 | { |
| 88 | struct onenand_info *info = platform_get_drvdata(pdev); |
| 89 | struct resource *res = pdev->resource; |
| 90 | unsigned long size = resource_size(res); |
| 91 | |
| 92 | if (info) { |
| 93 | onenand_release(&info->mtd); |
| 94 | release_mem_region(res->start, size); |
| 95 | iounmap(info->onenand.base); |
| 96 | kfree(info); |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static struct platform_driver generic_onenand_driver = { |
| 103 | .driver = { |
| 104 | .name = DRIVER_NAME, |
| 105 | }, |
| 106 | .probe = generic_onenand_probe, |
| 107 | .remove = generic_onenand_remove, |
| 108 | }; |
| 109 | |
| 110 | module_platform_driver(generic_onenand_driver); |
| 111 | |
| 112 | MODULE_LICENSE("GPL"); |
| 113 | MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); |
| 114 | MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards"); |
| 115 | MODULE_ALIAS("platform:" DRIVER_NAME); |