Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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 ======================================================================*/
26
27 #include <linux/module.h>
28 #include <linux/types.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/ioport.h>
32 #include <linux/platform_device.h>
33 #include <linux/init.h>
34
35 #include <linux/mtd/mtd.h>
36 #include <linux/mtd/map.h>
37 #include <linux/mtd/partitions.h>
38
39 #include <asm/mach/flash.h>
40 #include <mach/hardware.h>
41 #include <asm/io.h>
42 #include <asm/system.h>
43
44 #ifdef CONFIG_ARCH_P720T
45 #define FLASH_BASE              (0x04000000)
46 #define FLASH_SIZE              (64*1024*1024)
47 #endif
48
49 struct armflash_info {
50         struct flash_platform_data *plat;
51         struct resource         *res;
52         struct mtd_partition    *parts;
53         struct mtd_info         *mtd;
54         struct map_info         map;
55 };
56
57 static void armflash_set_vpp(struct map_info *map, int on)
58 {
59         struct armflash_info *info = container_of(map, struct armflash_info, map);
60
61         if (info->plat && info->plat->set_vpp)
62                 info->plat->set_vpp(on);
63 }
64
65 static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
66
67 static int armflash_probe(struct platform_device *dev)
68 {
69         struct flash_platform_data *plat = dev->dev.platform_data;
70         struct resource *res = dev->resource;
71         unsigned int size = res->end - res->start + 1;
72         struct armflash_info *info;
73         int err;
74         void __iomem *base;
75
76         info = kzalloc(sizeof(struct armflash_info), GFP_KERNEL);
77         if (!info) {
78                 err = -ENOMEM;
79                 goto out;
80         }
81
82         info->plat = plat;
83         if (plat && plat->init) {
84                 err = plat->init();
85                 if (err)
86                         goto no_resource;
87         }
88
89         info->res = request_mem_region(res->start, size, "armflash");
90         if (!info->res) {
91                 err = -EBUSY;
92                 goto no_resource;
93         }
94
95         base = ioremap(res->start, size);
96         if (!base) {
97                 err = -ENOMEM;
98                 goto no_mem;
99         }
100
101         /*
102          * look for CFI based flash parts fitted to this board
103          */
104         info->map.size          = size;
105         info->map.bankwidth     = plat->width;
106         info->map.phys          = res->start;
107         info->map.virt          = base;
108         info->map.name          = dev_name(&dev->dev);
109         info->map.set_vpp       = armflash_set_vpp;
110
111         simple_map_init(&info->map);
112
113         /*
114          * Also, the CFI layer automatically works out what size
115          * of chips we have, and does the necessary identification
116          * for us automatically.
117          */
118         info->mtd = do_map_probe(plat->map_name, &info->map);
119         if (!info->mtd) {
120                 err = -ENXIO;
121                 goto no_device;
122         }
123
124         info->mtd->owner = THIS_MODULE;
125
126         err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
127         if (err > 0) {
128                 err = add_mtd_partitions(info->mtd, info->parts, err);
129                 if (err)
130                         printk(KERN_ERR
131                                "mtd partition registration failed: %d\n", err);
132         }
133
134         if (err == 0)
135                 platform_set_drvdata(dev, info);
136
137         /*
138          * If we got an error, free all resources.
139          */
140         if (err < 0) {
141                 if (info->mtd) {
142                         del_mtd_partitions(info->mtd);
143                         map_destroy(info->mtd);
144                 }
145                 kfree(info->parts);
146
147  no_device:
148                 iounmap(base);
149  no_mem:
150                 release_mem_region(res->start, size);
151  no_resource:
152                 if (plat && plat->exit)
153                         plat->exit();
154                 kfree(info);
155         }
156  out:
157         return err;
158 }
159
160 static int armflash_remove(struct platform_device *dev)
161 {
162         struct armflash_info *info = platform_get_drvdata(dev);
163
164         platform_set_drvdata(dev, NULL);
165
166         if (info) {
167                 if (info->mtd) {
168                         del_mtd_partitions(info->mtd);
169                         map_destroy(info->mtd);
170                 }
171                 kfree(info->parts);
172
173                 iounmap(info->map.virt);
174                 release_resource(info->res);
175                 kfree(info->res);
176
177                 if (info->plat && info->plat->exit)
178                         info->plat->exit();
179
180                 kfree(info);
181         }
182
183         return 0;
184 }
185
186 static struct platform_driver armflash_driver = {
187         .probe          = armflash_probe,
188         .remove         = armflash_remove,
189         .driver         = {
190                 .name   = "armflash",
191                 .owner  = THIS_MODULE,
192         },
193 };
194
195 static int __init armflash_init(void)
196 {
197         return platform_driver_register(&armflash_driver);
198 }
199
200 static void __exit armflash_exit(void)
201 {
202         platform_driver_unregister(&armflash_driver);
203 }
204
205 module_init(armflash_init);
206 module_exit(armflash_exit);
207
208 MODULE_AUTHOR("ARM Ltd");
209 MODULE_DESCRIPTION("ARM Integrator CFI map driver");
210 MODULE_LICENSE("GPL");
211 MODULE_ALIAS("platform:armflash");