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 | |
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(dev: &pdev->dev); |
36 | struct resource *res = pdev->resource; |
37 | unsigned long size = resource_size(res); |
38 | int err; |
39 | |
40 | info = kzalloc(size: 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(offset: 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(mtd: &info->mtd, max_chips: 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, data: info); |
75 | |
76 | return 0; |
77 | |
78 | out_iounmap: |
79 | iounmap(addr: info->onenand.base); |
80 | out_release_mem_region: |
81 | release_mem_region(res->start, size); |
82 | out_free_info: |
83 | kfree(objp: info); |
84 | |
85 | return err; |
86 | } |
87 | |
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(mtd: &info->mtd); |
96 | release_mem_region(res->start, size); |
97 | iounmap(addr: info->onenand.base); |
98 | kfree(objp: 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 | |