tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Flash memory support for various TI OMAP boards
3 *
4 * Copyright (C) 2001-2002 MontaVista Software Inc.
5 * Copyright (C) 2003-2004 Texas Instruments
6 * Copyright (C) 2004 Nokia Corporation
7 *
8 * Assembled using driver code copyright the companies above
9 * and written by David Brownell, Jian Zhang <jzhang@ti.com>,
10 * Tony Lindgren <tony@atomide.com> and others.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
20 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * You should have received a copy of the GNU General Public License along
29 * with this program; if not, write to the Free Software Foundation, Inc.,
30 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
33#include <linux/device.h>
34#include <linux/module.h>
35#include <linux/types.h>
36#include <linux/kernel.h>
37#include <linux/init.h>
38#include <linux/ioport.h>
39#include <linux/mtd/mtd.h>
40#include <linux/mtd/map.h>
41#include <linux/mtd/partitions.h>
42
43#include <asm/io.h>
44#include <asm/hardware.h>
45#include <asm/mach-types.h>
46#include <asm/mach/flash.h>
47#include <asm/arch/tc.h>
48
49#ifdef CONFIG_MTD_PARTITIONS
50static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
51#endif
52
53struct omapflash_info {
54 struct mtd_partition *parts;
55 struct mtd_info *mtd;
56 struct map_info map;
57};
58
59static void omap_set_vpp(struct map_info *map, int enable)
60{
61 static int count;
62
63 if (enable) {
64 if (count++ == 0)
65 OMAP_EMIFS_CONFIG_REG |= OMAP_EMIFS_CONFIG_WP;
66 } else {
67 if (count && (--count == 0))
68 OMAP_EMIFS_CONFIG_REG &= ~OMAP_EMIFS_CONFIG_WP;
69 }
70}
71
72static int __devinit omapflash_probe(struct device *dev)
73{
74 int err;
75 struct omapflash_info *info;
76 struct platform_device *pdev = to_platform_device(dev);
77 struct flash_platform_data *pdata = pdev->dev.platform_data;
78 struct resource *res = pdev->resource;
79 unsigned long size = res->end - res->start + 1;
80
81 info = kmalloc(sizeof(struct omapflash_info), GFP_KERNEL);
82 if (!info)
83 return -ENOMEM;
84
85 memset(info, 0, sizeof(struct omapflash_info));
86
87 if (!request_mem_region(res->start, size, "flash")) {
88 err = -EBUSY;
89 goto out_free_info;
90 }
91
92 info->map.virt = ioremap(res->start, size);
93 if (!info->map.virt) {
94 err = -ENOMEM;
95 goto out_release_mem_region;
96 }
97 info->map.name = pdev->dev.bus_id;
98 info->map.phys = res->start;
99 info->map.size = size;
100 info->map.bankwidth = pdata->width;
101 info->map.set_vpp = omap_set_vpp;
102
103 simple_map_init(&info->map);
104 info->mtd = do_map_probe(pdata->map_name, &info->map);
105 if (!info->mtd) {
106 err = -EIO;
107 goto out_iounmap;
108 }
109 info->mtd->owner = THIS_MODULE;
110
111#ifdef CONFIG_MTD_PARTITIONS
112 err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
113 if (err > 0)
114 add_mtd_partitions(info->mtd, info->parts, err);
115 else if (err < 0 && pdata->parts)
116 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
117 else
118#endif
119 add_mtd_device(info->mtd);
120
121 dev_set_drvdata(&pdev->dev, info);
122
123 return 0;
124
125out_iounmap:
126 iounmap(info->map.virt);
127out_release_mem_region:
128 release_mem_region(res->start, size);
129out_free_info:
130 kfree(info);
131
132 return err;
133}
134
135static int __devexit omapflash_remove(struct device *dev)
136{
137 struct platform_device *pdev = to_platform_device(dev);
138 struct omapflash_info *info = dev_get_drvdata(&pdev->dev);
139
140 dev_set_drvdata(&pdev->dev, NULL);
141
142 if (info) {
143 if (info->parts) {
144 del_mtd_partitions(info->mtd);
145 kfree(info->parts);
146 } else
147 del_mtd_device(info->mtd);
148 map_destroy(info->mtd);
149 release_mem_region(info->map.phys, info->map.size);
150 iounmap((void __iomem *) info->map.virt);
151 kfree(info);
152 }
153
154 return 0;
155}
156
157static struct device_driver omapflash_driver = {
158 .name = "omapflash",
159 .bus = &platform_bus_type,
160 .probe = omapflash_probe,
161 .remove = __devexit_p(omapflash_remove),
162};
163
164static int __init omapflash_init(void)
165{
166 return driver_register(&omapflash_driver);
167}
168
169static void __exit omapflash_exit(void)
170{
171 driver_unregister(&omapflash_driver);
172}
173
174module_init(omapflash_init);
175module_exit(omapflash_exit);
176
177MODULE_LICENSE("GPL");
178MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
179