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
omap_set_vpp(struct map_info * map,int enable)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
omapflash_probe(struct platform_device * pdev)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
omapflash_remove(struct platform_device * pdev)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
omapflash_init(void)171 static int __init omapflash_init(void)
172 {
173 return platform_driver_probe(&omapflash_driver, omapflash_probe);
174 }
175
omapflash_exit(void)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");
187