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/platform_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/slab.h>
40
41#include <linux/mtd/mtd.h>
42#include <linux/mtd/map.h>
43#include <linux/mtd/partitions.h>
44
45#include <asm/io.h>
46#include <asm/hardware.h>
47#include <asm/mach/flash.h>
48#include <asm/arch/tc.h>
49
50#ifdef CONFIG_MTD_PARTITIONS
51static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
52#endif
53
54struct omapflash_info {
55 struct mtd_partition *parts;
56 struct mtd_info *mtd;
57 struct map_info map;
58};
59
60static void omap_set_vpp(struct map_info *map, int enable)
61{
62 static int count;
63
64 if (enable) {
65 if (count++ == 0)
66 OMAP_EMIFS_CONFIG_REG |= OMAP_EMIFS_CONFIG_WP;
67 } else {
68 if (count && (--count == 0))
69 OMAP_EMIFS_CONFIG_REG &= ~OMAP_EMIFS_CONFIG_WP;
70 }
71}
72
73static int __init omapflash_probe(struct platform_device *pdev)
74{
75 int err;
76 struct omapflash_info *info;
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 = kzalloc(sizeof(struct omapflash_info), GFP_KERNEL);
82 if (!info)
83 return -ENOMEM;
84
85 if (!request_mem_region(res->start, size, "flash")) {
86 err = -EBUSY;
87 goto out_free_info;
88 }
89
90 info->map.virt = ioremap(res->start, size);
91 if (!info->map.virt) {
92 err = -ENOMEM;
93 goto out_release_mem_region;
94 }
95 info->map.name = pdev->dev.bus_id;
96 info->map.phys = res->start;
97 info->map.size = size;
98 info->map.bankwidth = pdata->width;
99 info->map.set_vpp = omap_set_vpp;
100
101 simple_map_init(&info->map);
102 info->mtd = do_map_probe(pdata->map_name, &info->map);
103 if (!info->mtd) {
104 err = -EIO;
105 goto out_iounmap;
106 }
107 info->mtd->owner = THIS_MODULE;
108
109#ifdef CONFIG_MTD_PARTITIONS
110 err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
111 if (err > 0)
112 add_mtd_partitions(info->mtd, info->parts, err);
113 else if (err < 0 && pdata->parts)
114 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
115 else
116#endif
117 add_mtd_device(info->mtd);
118
119 platform_set_drvdata(pdev, info);
120
121 return 0;
122
123out_iounmap:
124 iounmap(info->map.virt);
125out_release_mem_region:
126 release_mem_region(res->start, size);
127out_free_info:
128 kfree(info);
129
130 return err;
131}
132
133static int __exit omapflash_remove(struct platform_device *pdev)
134{
135 struct omapflash_info *info = platform_get_drvdata(pdev);
136
137 platform_set_drvdata(pdev, NULL);
138
139 if (info) {
140 if (info->parts) {
141 del_mtd_partitions(info->mtd);
142 kfree(info->parts);
143 } else
144 del_mtd_device(info->mtd);
145 map_destroy(info->mtd);
146 release_mem_region(info->map.phys, info->map.size);
147 iounmap((void __iomem *) info->map.virt);
148 kfree(info);
149 }
150
151 return 0;
152}
153
154static struct platform_driver omapflash_driver = {
155 .remove = __exit_p(omapflash_remove),
156 .driver = {
157 .name = "omapflash",
158 .owner = THIS_MODULE,
159 },
160};
161
162static int __init omapflash_init(void)
163{
164 return platform_driver_probe(&omapflash_driver, omapflash_probe);
165}
166
167static void __exit omapflash_exit(void)
168{
169 platform_driver_unregister(&omapflash_driver);
170}
171
172module_init(omapflash_init);
173module_exit(omapflash_exit);
174
175MODULE_LICENSE("GPL");
176MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
177MODULE_ALIAS("platform:omapflash");