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======================================================================*/
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#include <linux/io.h>
35
36#include <linux/mtd/mtd.h>
37#include <linux/mtd/map.h>
38#include <linux/mtd/partitions.h>
39
40#include <asm/mach/flash.h>
41#include <mach/hardware.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
49struct 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
57static 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
65static const char *probes[] = { "cmdlinepart", "RedBoot", "afs", NULL };
66
67static 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
160static 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
186static 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
195static int __init armflash_init(void)
196{
197 return platform_driver_register(&armflash_driver);
198}
199
200static void __exit armflash_exit(void)
201{
202 platform_driver_unregister(&armflash_driver);
203}
204
205module_init(armflash_init);
206module_exit(armflash_exit);
207
208MODULE_AUTHOR("ARM Ltd");
209MODULE_DESCRIPTION("ARM Integrator CFI map driver");
210MODULE_LICENSE("GPL");
211MODULE_ALIAS("platform:armflash");