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10c96f2e TP |
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> | |
4e57b681 TS |
39 | #include <linux/slab.h> |
40 | ||
10c96f2e TP |
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> | |
10c96f2e TP |
47 | #include <asm/mach/flash.h> |
48 | #include <asm/arch/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 | ||
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 | ||
73 | static int __devinit omapflash_probe(struct device *dev) | |
74 | { | |
75 | int err; | |
76 | struct omapflash_info *info; | |
77 | struct platform_device *pdev = to_platform_device(dev); | |
78 | struct flash_platform_data *pdata = pdev->dev.platform_data; | |
79 | struct resource *res = pdev->resource; | |
80 | unsigned long size = res->end - res->start + 1; | |
81 | ||
82 | info = kmalloc(sizeof(struct omapflash_info), GFP_KERNEL); | |
83 | if (!info) | |
84 | return -ENOMEM; | |
85 | ||
86 | memset(info, 0, sizeof(struct omapflash_info)); | |
87 | ||
88 | if (!request_mem_region(res->start, size, "flash")) { | |
89 | err = -EBUSY; | |
90 | goto out_free_info; | |
91 | } | |
92 | ||
93 | info->map.virt = ioremap(res->start, size); | |
94 | if (!info->map.virt) { | |
95 | err = -ENOMEM; | |
96 | goto out_release_mem_region; | |
97 | } | |
98 | info->map.name = pdev->dev.bus_id; | |
99 | info->map.phys = res->start; | |
100 | info->map.size = size; | |
101 | info->map.bankwidth = pdata->width; | |
102 | info->map.set_vpp = omap_set_vpp; | |
103 | ||
104 | simple_map_init(&info->map); | |
105 | info->mtd = do_map_probe(pdata->map_name, &info->map); | |
106 | if (!info->mtd) { | |
107 | err = -EIO; | |
108 | goto out_iounmap; | |
109 | } | |
110 | info->mtd->owner = THIS_MODULE; | |
111 | ||
112 | #ifdef CONFIG_MTD_PARTITIONS | |
113 | err = parse_mtd_partitions(info->mtd, part_probes, &info->parts, 0); | |
114 | if (err > 0) | |
115 | add_mtd_partitions(info->mtd, info->parts, err); | |
116 | else if (err < 0 && pdata->parts) | |
117 | add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts); | |
118 | else | |
119 | #endif | |
120 | add_mtd_device(info->mtd); | |
121 | ||
122 | dev_set_drvdata(&pdev->dev, info); | |
123 | ||
124 | return 0; | |
125 | ||
126 | out_iounmap: | |
127 | iounmap(info->map.virt); | |
128 | out_release_mem_region: | |
129 | release_mem_region(res->start, size); | |
130 | out_free_info: | |
131 | kfree(info); | |
132 | ||
133 | return err; | |
134 | } | |
135 | ||
136 | static int __devexit omapflash_remove(struct device *dev) | |
137 | { | |
138 | struct platform_device *pdev = to_platform_device(dev); | |
139 | struct omapflash_info *info = dev_get_drvdata(&pdev->dev); | |
140 | ||
141 | dev_set_drvdata(&pdev->dev, NULL); | |
142 | ||
143 | if (info) { | |
144 | if (info->parts) { | |
145 | del_mtd_partitions(info->mtd); | |
146 | kfree(info->parts); | |
147 | } else | |
148 | del_mtd_device(info->mtd); | |
149 | map_destroy(info->mtd); | |
150 | release_mem_region(info->map.phys, info->map.size); | |
151 | iounmap((void __iomem *) info->map.virt); | |
152 | kfree(info); | |
153 | } | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static struct device_driver omapflash_driver = { | |
159 | .name = "omapflash", | |
160 | .bus = &platform_bus_type, | |
161 | .probe = omapflash_probe, | |
162 | .remove = __devexit_p(omapflash_remove), | |
163 | }; | |
164 | ||
165 | static int __init omapflash_init(void) | |
166 | { | |
167 | return driver_register(&omapflash_driver); | |
168 | } | |
169 | ||
170 | static void __exit omapflash_exit(void) | |
171 | { | |
172 | driver_unregister(&omapflash_driver); | |
173 | } | |
174 | ||
175 | module_init(omapflash_init); | |
176 | module_exit(omapflash_exit); | |
177 | ||
178 | MODULE_LICENSE("GPL"); | |
179 | MODULE_DESCRIPTION("MTD NOR map driver for TI OMAP boards"); | |
180 |