5b69e7773c6c2a826ac8b3983913e5df749db549
[firefly-linux-kernel-4.4.55.git] / drivers / mtd / onenand / generic.c
1 /*
2  *  linux/drivers/mtd/onenand/generic.c
3  *
4  *  Copyright (c) 2005 Samsung Electronics
5  *  Kyungmin Park <kyungmin.park@samsung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  *
11  *  Overview:
12  *   This is a device driver for the OneNAND flash for generic boards.
13  */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/platform_device.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/onenand.h>
21 #include <linux/mtd/partitions.h>
22
23 #include <asm/io.h>
24 #include <asm/mach/flash.h>
25
26 #define DRIVER_NAME     "onenand"
27
28
29 #ifdef CONFIG_MTD_PARTITIONS
30 static const char *part_probes[] = { "cmdlinepart", NULL,  };
31 #endif
32
33 struct onenand_info {
34         struct mtd_info         mtd;
35         struct mtd_partition    *parts;
36         struct onenand_chip     onenand;
37 };
38
39 static int __devinit generic_onenand_probe(struct device *dev)
40 {
41         struct onenand_info *info;
42         struct platform_device *pdev = to_platform_device(dev);
43         struct flash_platform_data *pdata = pdev->dev.platform_data;
44         struct resource *res = pdev->resource;
45         unsigned long size = res->end - res->start + 1;
46         int err;
47
48         info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
49         if (!info)
50                 return -ENOMEM;
51
52         if (!request_mem_region(res->start, size, dev->driver->name)) {
53                 err = -EBUSY;
54                 goto out_free_info;
55         }
56
57         info->onenand.base = ioremap(res->start, size);
58         if (!info->onenand.base) {
59                 err = -ENOMEM;
60                 goto out_release_mem_region;
61         }
62
63         info->onenand.mmcontrol = pdata->mmcontrol;
64         info->onenand.irq = platform_get_irq(pdev, 0);
65
66         info->mtd.name = dev_name(&pdev->dev);
67         info->mtd.priv = &info->onenand;
68         info->mtd.owner = THIS_MODULE;
69
70         if (onenand_scan(&info->mtd, 1)) {
71                 err = -ENXIO;
72                 goto out_iounmap;
73         }
74
75 #ifdef CONFIG_MTD_PARTITIONS
76         err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
77         if (err > 0)
78                 add_mtd_partitions(&info->mtd, info->parts, err);
79         else if (err <= 0 && pdata->parts)
80                 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
81         else
82 #endif
83                 err = add_mtd_device(&info->mtd);
84
85         dev_set_drvdata(&pdev->dev, info);
86
87         return 0;
88
89 out_iounmap:
90         iounmap(info->onenand.base);
91 out_release_mem_region:
92         release_mem_region(res->start, size);
93 out_free_info:
94         kfree(info);
95
96         return err;
97 }
98
99 static int __devexit generic_onenand_remove(struct device *dev)
100 {
101         struct platform_device *pdev = to_platform_device(dev);
102         struct onenand_info *info = dev_get_drvdata(&pdev->dev);
103         struct resource *res = pdev->resource;
104         unsigned long size = res->end - res->start + 1;
105
106         dev_set_drvdata(&pdev->dev, NULL);
107
108         if (info) {
109                 if (info->parts)
110                         del_mtd_partitions(&info->mtd);
111                 else
112                         del_mtd_device(&info->mtd);
113
114                 onenand_release(&info->mtd);
115                 release_mem_region(res->start, size);
116                 iounmap(info->onenand.base);
117                 kfree(info);
118         }
119
120         return 0;
121 }
122
123 static struct device_driver generic_onenand_driver = {
124         .name           = DRIVER_NAME,
125         .bus            = &platform_bus_type,
126         .probe          = generic_onenand_probe,
127         .remove         = __devexit_p(generic_onenand_remove),
128 };
129
130 MODULE_ALIAS(DRIVER_NAME);
131
132 static int __init generic_onenand_init(void)
133 {
134         return driver_register(&generic_onenand_driver);
135 }
136
137 static void __exit generic_onenand_exit(void)
138 {
139         driver_unregister(&generic_onenand_driver);
140 }
141
142 module_init(generic_onenand_init);
143 module_exit(generic_onenand_exit);
144
145 MODULE_LICENSE("GPL");
146 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
147 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");