1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  Copyright (c) 2005 Samsung Electronics
4 *  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 struct
22 * onenand_platform_data as platform data. The old ARM-specific version
23 * 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