tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
51struct 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
59static 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
67static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
68
69static 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 = kmalloc(sizeof(struct armflash_info), GFP_KERNEL);
79 if (!info) {
80 err = -ENOMEM;
81 goto out;
82 }
83
84 memset(info, 0, sizeof(struct armflash_info));
85
86 info->plat = plat;
87 if (plat && plat->init) {
88 err = plat->init();
89 if (err)
90 goto no_resource;
91 }
92
93 info->res = request_mem_region(res->start, size, "armflash");
94 if (!info->res) {
95 err = -EBUSY;
96 goto no_resource;
97 }
98
99 base = ioremap(res->start, size);
100 if (!base) {
101 err = -ENOMEM;
102 goto no_mem;
103 }
104
105 /*
106 * look for CFI based flash parts fitted to this board
107 */
108 info->map.size = size;
109 info->map.bankwidth = plat->width;
110 info->map.phys = res->start;
111 info->map.virt = base;
112 info->map.name = dev->dev.bus_id;
113 info->map.set_vpp = armflash_set_vpp;
114
115 simple_map_init(&info->map);
116
117 /*
118 * Also, the CFI layer automatically works out what size
119 * of chips we have, and does the necessary identification
120 * for us automatically.
121 */
122 info->mtd = do_map_probe(plat->map_name, &info->map);
123 if (!info->mtd) {
124 err = -ENXIO;
125 goto no_device;
126 }
127
128 info->mtd->owner = THIS_MODULE;
129
130 err = parse_mtd_partitions(info->mtd, probes, &info->parts, 0);
131 if (err > 0) {
132 err = add_mtd_partitions(info->mtd, info->parts, err);
133 if (err)
134 printk(KERN_ERR
135 "mtd partition registration failed: %d\n", err);
136 }
137
138 if (err == 0)
139 platform_set_drvdata(dev, info);
140
141 /*
142 * If we got an error, free all resources.
143 */
144 if (err < 0) {
145 if (info->mtd) {
146 del_mtd_partitions(info->mtd);
147 map_destroy(info->mtd);
148 }
149 kfree(info->parts);
150
151 no_device:
152 iounmap(base);
153 no_mem:
154 release_mem_region(res->start, size);
155 no_resource:
156 if (plat && plat->exit)
157 plat->exit();
158 kfree(info);
159 }
160 out:
161 return err;
162}
163
164static int armflash_remove(struct platform_device *dev)
165{
166 struct armflash_info *info = platform_get_drvdata(dev);
167
168 platform_set_drvdata(dev, NULL);
169
170 if (info) {
171 if (info->mtd) {
172 del_mtd_partitions(info->mtd);
173 map_destroy(info->mtd);
174 }
175 kfree(info->parts);
176
177 iounmap(info->map.virt);
178 release_resource(info->res);
179 kfree(info->res);
180
181 if (info->plat && info->plat->exit)
182 info->plat->exit();
183
184 kfree(info);
185 }
186
187 return 0;
188}
189
190static struct platform_driver armflash_driver = {
191 .probe = armflash_probe,
192 .remove = armflash_remove,
193 .driver = {
194 .name = "armflash",
195 },
196};
197
198static int __init armflash_init(void)
199{
200 return platform_driver_register(&armflash_driver);
201}
202
203static void __exit armflash_exit(void)
204{
205 platform_driver_unregister(&armflash_driver);
206}
207
208module_init(armflash_init);
209module_exit(armflash_exit);
210
211MODULE_AUTHOR("ARM Ltd");
212MODULE_DESCRIPTION("ARM Integrator CFI map driver");
213MODULE_LICENSE("GPL");