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 = 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
162static 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
188static struct platform_driver armflash_driver = {
189 .probe = armflash_probe,
190 .remove = armflash_remove,
191 .driver = {
192 .name = "armflash",
193 },
194};
195
196static int __init armflash_init(void)
197{
198 return platform_driver_register(&armflash_driver);
199}
200
201static void __exit armflash_exit(void)
202{
203 platform_driver_unregister(&armflash_driver);
204}
205
206module_init(armflash_init);
207module_exit(armflash_exit);
208
209MODULE_AUTHOR("ARM Ltd");
210MODULE_DESCRIPTION("ARM Integrator CFI map driver");
211MODULE_LICENSE("GPL");