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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 
generic_onenand_probe(struct device * dev)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 
generic_onenand_remove(struct device * dev)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 
generic_onenand_init(void)132 static int __init generic_onenand_init(void)
133 {
134 	return driver_register(&generic_onenand_driver);
135 }
136 
generic_onenand_exit(void)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");
148