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
27 struct onenand_info {
28 struct mtd_info mtd;
29 struct onenand_chip onenand;
30 };
31
generic_onenand_probe(struct platform_device * pdev)32 static 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
78 out_iounmap:
79 iounmap(info->onenand.base);
80 out_release_mem_region:
81 release_mem_region(res->start, size);
82 out_free_info:
83 kfree(info);
84
85 return err;
86 }
87
generic_onenand_remove(struct platform_device * pdev)88 static 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
102 static 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
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
