V4L/DVB (10743): dm1105: not demuxing from interrupt context.
[linux-2.6] / drivers / mtd / maps / omap_nor.c
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 <mach/hardware.h>
47 #include <asm/mach/flash.h>
48 #include <mach/tc.h>
49
50 #ifdef CONFIG_MTD_PARTITIONS
51 static const char *part_probes[] = { /* "RedBoot", */ "cmdlinepart", NULL };
52 #endif
53
54 struct omapflash_info {
55         struct mtd_partition    *parts;
56         struct mtd_info         *mtd;
57         struct map_info         map;
58 };
59
60 static void omap_set_vpp(struct map_info *map, int enable)
61 {
62         static int      count;
63         u32 l;
64
65         if (cpu_class_is_omap1()) {
66                 if (enable) {
67                         if (count++ == 0) {
68                                 l = omap_readl(EMIFS_CONFIG);
69                                 l |= OMAP_EMIFS_CONFIG_WP;
70                                 omap_writel(l, EMIFS_CONFIG);
71                         }
72                 } else {
73                         if (count && (--count == 0)) {
74                                 l = omap_readl(EMIFS_CONFIG);
75                                 l &= ~OMAP_EMIFS_CONFIG_WP;
76                                 omap_writel(l, EMIFS_CONFIG);
77                         }
78                 }
79         }
80 }
81
82 static int __init omapflash_probe(struct platform_device *pdev)
83 {
84         int err;
85         struct omapflash_info *info;
86         struct flash_platform_data *pdata = pdev->dev.platform_data;
87         struct resource *res = pdev->resource;
88         unsigned long size = res->end - res->start + 1;
89
90         info = kzalloc(sizeof(struct omapflash_info), GFP_KERNEL);
91         if (!info)
92                 return -ENOMEM;
93
94         if (!request_mem_region(res->start, size, "flash")) {
95                 err = -EBUSY;
96                 goto out_free_info;
97         }
98
99         info->map.virt          = ioremap(res->start, size);
100         if (!info->map.virt) {
101                 err = -ENOMEM;
102                 goto out_release_mem_region;
103         }
104         info->map.name          = dev_name(&pdev->dev);
105         info->map.phys          = res->start;
106         info->map.size          = size;
107         info->map.bankwidth     = pdata->width;
108         info->map.set_vpp       = omap_set_vpp;
109
110         simple_map_init(&info->map);
111         info->mtd = do_map_probe(pdata->map_name, &info->map);
112         if (!info->mtd) {
113                 err = -EIO;
114                 goto out_iounmap;
115         }
116         info->mtd->owner = THIS_MODULE;
117
118 #ifdef CONFIG_MTD_PARTITIONS
119         err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0);
120         if (err > 0)
121                 add_mtd_partitions(info->mtd, info->parts, err);
122         else if (err <= 0 && pdata->parts)
123                 add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
124         else
125 #endif
126                 add_mtd_device(info->mtd);
127
128         platform_set_drvdata(pdev, info);
129
130         return 0;
131
132 out_iounmap:
133         iounmap(info->map.virt);
134 out_release_mem_region:
135         release_mem_region(res->start, size);
136 out_free_info:
137         kfree(info);
138
139         return err;
140 }
141
142 static int __exit omapflash_remove(struct platform_device *pdev)
143 {
144         struct omapflash_info *info = platform_get_drvdata(pdev);
145
146         platform_set_drvdata(pdev, NULL);
147
148         if (info) {
149                 if (info->parts) {
150                         del_mtd_partitions(info->mtd);
151                         kfree(info->parts);
152                 } else
153                         del_mtd_device(info->mtd);
154                 map_destroy(info->mtd);
155                 release_mem_region(info->map.phys, info->map.size);
156                 iounmap((void __iomem *) info->map.virt);
157                 kfree(info);
158         }
159
160         return 0;
161 }
162
163 static struct platform_driver omapflash_driver = {
164         .remove = __exit_p(omapflash_remove),
165         .driver = {
166                 .name   = "omapflash",
167                 .owner  = THIS_MODULE,
168         },
169 };
170
171 static int __init omapflash_init(void)
172 {
173         return platform_driver_probe(&omapflash_driver, omapflash_probe);
174 }
175
176 static void __exit omapflash_exit(void)
177 {
178         platform_driver_unregister(&omapflash_driver);
179 }
180
181 module_init(omapflash_init);
182 module_exit(omapflash_exit);
183
184 MODULE_LICENSE("GPL");
185 MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards");
186 MODULE_ALIAS("platform:omapflash");