]> err.no Git - linux-2.6/blob - drivers/mtd/maps/integrator-flash.c
Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / drivers / mtd / maps / integrator-flash.c
1 /*======================================================================
2
3     drivers/mtd/maps/integrator-flash.c: ARM Integrator flash map driver
4
5     Copyright (C) 2000 ARM Limited
6     Copyright (C) 2003 Deep Blue Solutions Ltd.
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 2 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    You should have received a copy of the GNU General Public License
19    along with this program; if not, write to the Free Software
20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21
22    This is access code for flashes using ARM's flash partitioning
23    standards.
24
25    $Id: integrator-flash.c,v 1.20 2005/11/07 11:14:27 gleixner Exp $
26
27 ======================================================================*/
28
29 #include <linux/module.h>
30 #include <linux/types.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/ioport.h>
34 #include <linux/platform_device.h>
35 #include <linux/init.h>
36
37 #include <linux/mtd/mtd.h>
38 #include <linux/mtd/map.h>
39 #include <linux/mtd/partitions.h>
40
41 #include <asm/mach/flash.h>
42 #include <asm/hardware.h>
43 #include <asm/io.h>
44 #include <asm/system.h>
45
46 #ifdef CONFIG_ARCH_P720T
47 #define FLASH_BASE              (0x04000000)
48 #define FLASH_SIZE              (64*1024*1024)
49 #endif
50
51 struct armflash_info {
52         struct flash_platform_data *plat;
53         struct resource         *res;
54         struct mtd_partition    *parts;
55         struct mtd_info         *mtd;
56         struct map_info         map;
57 };
58
59 static void armflash_set_vpp(struct map_info *map, int on)
60 {
61         struct armflash_info *info = container_of(map, struct armflash_info, map);
62
63         if (info->plat && info->plat->set_vpp)
64                 info->plat->set_vpp(on);
65 }
66
67 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
68
69 static int armflash_probe(struct platform_device *dev)
70 {
71         struct flash_platform_data *plat = dev->dev.platform_data;
72         struct resource *res = dev->resource;
73         unsigned int size = res->end - res->start + 1;
74         struct armflash_info *info;
75         int err;
76         void __iomem *base;
77
78         info = kzalloc(sizeof(struct armflash_info), GFP_KERNEL);
79         if (!info) {
80                 err = -ENOMEM;
81                 goto out;
82         }
83
84         info->plat = plat;
85         if (plat && plat->init) {
86                 err = plat->init();
87                 if (err)
88                         goto no_resource;
89         }
90
91         info->res = request_mem_region(res->start, size, "armflash");
92         if (!info->res) {
93                 err = -EBUSY;
94                 goto no_resource;
95         }
96
97         base = ioremap(res->start, size);
98         if (!base) {
99                 err = -ENOMEM;
100                 goto no_mem;
101         }
102
103         /*
104          * look for CFI based flash parts fitted to this board
105          */
106         info->map.size          = size;
107         info->map.bankwidth     = plat->width;
108         info->map.phys          = res->start;
109         info->map.virt          = base;
110         info->map.name          = dev->dev.bus_id;
111         info->map.set_vpp       = armflash_set_vpp;
112
113         simple_map_init(&info->map);
114
115         /*
116          * Also, the CFI layer automatically works out what size
117          * of chips we have, and does the necessary identification
118          * for us automatically.
119          */
120         info->mtd = do_map_probe(plat->map_name, &info->map);
121         if (!info->mtd) {
122                 err = -ENXIO;
123                 goto no_device;
124         }
125
126         info->mtd->owner = THIS_MODULE;
127
128         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
129         if (err > 0) {
130                 err = add_mtd_partitions(info->mtd, info->parts, err);
131                 if (err)
132                         printk(KERN_ERR
133                                "mtd partition registration failed: %d\n", err);
134         }
135
136         if (err == 0)
137                 platform_set_drvdata(dev, info);
138
139         /*
140          * If we got an error, free all resources.
141          */
142         if (err < 0) {
143                 if (info->mtd) {
144                         del_mtd_partitions(info->mtd);
145                         map_destroy(info->mtd);
146                 }
147                 kfree(info->parts);
148
149  no_device:
150                 iounmap(base);
151  no_mem:
152                 release_mem_region(res->start, size);
153  no_resource:
154                 if (plat && plat->exit)
155                         plat->exit();
156                 kfree(info);
157         }
158  out:
159         return err;
160 }
161
162 static int armflash_remove(struct platform_device *dev)
163 {
164         struct armflash_info *info = platform_get_drvdata(dev);
165
166         platform_set_drvdata(dev, NULL);
167
168         if (info) {
169                 if (info->mtd) {
170                         del_mtd_partitions(info->mtd);
171                         map_destroy(info->mtd);
172                 }
173                 kfree(info->parts);
174
175                 iounmap(info->map.virt);
176                 release_resource(info->res);
177                 kfree(info->res);
178
179                 if (info->plat && info->plat->exit)
180                         info->plat->exit();
181
182                 kfree(info);
183         }
184
185         return 0;
186 }
187
188 static struct platform_driver armflash_driver = {
189         .probe          = armflash_probe,
190         .remove         = armflash_remove,
191         .driver         = {
192                 .name   = "armflash",
193         },
194 };
195
196 static int __init armflash_init(void)
197 {
198         return platform_driver_register(&armflash_driver);
199 }
200
201 static void __exit armflash_exit(void)
202 {
203         platform_driver_unregister(&armflash_driver);
204 }
205
206 module_init(armflash_init);
207 module_exit(armflash_exit);
208
209 MODULE_AUTHOR("ARM Ltd");
210 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
211 MODULE_LICENSE("GPL");