ia64/linux-2.6.18-xen.hg

view drivers/mtd/onenand/generic.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
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>
23 #include <asm/io.h>
24 #include <asm/mach/flash.h>
26 #define DRIVER_NAME "onenand"
29 #ifdef CONFIG_MTD_PARTITIONS
30 static const char *part_probes[] = { "cmdlinepart", NULL, };
31 #endif
33 struct onenand_info {
34 struct mtd_info mtd;
35 struct mtd_partition *parts;
36 struct onenand_chip onenand;
37 };
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;
48 info = kmalloc(sizeof(struct onenand_info), GFP_KERNEL);
49 if (!info)
50 return -ENOMEM;
52 memset(info, 0, sizeof(struct onenand_info));
54 if (!request_mem_region(res->start, size, dev->driver->name)) {
55 err = -EBUSY;
56 goto out_free_info;
57 }
59 info->onenand.base = ioremap(res->start, size);
60 if (!info->onenand.base) {
61 err = -ENOMEM;
62 goto out_release_mem_region;
63 }
65 info->onenand.mmcontrol = pdata->mmcontrol;
67 info->mtd.name = pdev->dev.bus_id;
68 info->mtd.priv = &info->onenand;
69 info->mtd.owner = THIS_MODULE;
71 if (onenand_scan(&info->mtd, 1)) {
72 err = -ENXIO;
73 goto out_iounmap;
74 }
76 #ifdef CONFIG_MTD_PARTITIONS
77 err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
78 if (err > 0)
79 add_mtd_partitions(&info->mtd, info->parts, err);
80 else if (err < 0 && pdata->parts)
81 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
82 else
83 #endif
84 err = add_mtd_device(&info->mtd);
86 dev_set_drvdata(&pdev->dev, info);
88 return 0;
90 out_iounmap:
91 iounmap(info->onenand.base);
92 out_release_mem_region:
93 release_mem_region(res->start, size);
94 out_free_info:
95 kfree(info);
97 return err;
98 }
100 static int __devexit generic_onenand_remove(struct device *dev)
101 {
102 struct platform_device *pdev = to_platform_device(dev);
103 struct onenand_info *info = dev_get_drvdata(&pdev->dev);
104 struct resource *res = pdev->resource;
105 unsigned long size = res->end - res->start + 1;
107 dev_set_drvdata(&pdev->dev, NULL);
109 if (info) {
110 if (info->parts)
111 del_mtd_partitions(&info->mtd);
112 else
113 del_mtd_device(&info->mtd);
115 onenand_release(&info->mtd);
116 release_mem_region(res->start, size);
117 iounmap(info->onenand.base);
118 kfree(info);
119 }
121 return 0;
122 }
124 static struct device_driver generic_onenand_driver = {
125 .name = DRIVER_NAME,
126 .bus = &platform_bus_type,
127 .probe = generic_onenand_probe,
128 .remove = __devexit_p(generic_onenand_remove),
129 };
131 MODULE_ALIAS(DRIVER_NAME);
133 static int __init generic_onenand_init(void)
134 {
135 return driver_register(&generic_onenand_driver);
136 }
138 static void __exit generic_onenand_exit(void)
139 {
140 driver_unregister(&generic_onenand_driver);
141 }
143 module_init(generic_onenand_init);
144 module_exit(generic_onenand_exit);
146 MODULE_LICENSE("GPL");
147 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
148 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");