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); 116