ia64/linux-2.6.18-xen.hg

view drivers/mtd/afs.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*======================================================================
3 drivers/mtd/afs.c: ARM Flash Layout/Partitioning
5 Copyright (C) 2000 ARM Limited
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 This is access code for flashes using ARM's flash partitioning
22 standards.
24 $Id: afs.c,v 1.15 2005/11/07 11:14:19 gleixner Exp $
26 ======================================================================*/
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/string.h>
33 #include <linux/init.h>
35 #include <linux/mtd/mtd.h>
36 #include <linux/mtd/map.h>
37 #include <linux/mtd/partitions.h>
39 struct footer_struct {
40 u32 image_info_base; /* Address of first word of ImageFooter */
41 u32 image_start; /* Start of area reserved by this footer */
42 u32 signature; /* 'Magic' number proves it's a footer */
43 u32 type; /* Area type: ARM Image, SIB, customer */
44 u32 checksum; /* Just this structure */
45 };
47 struct image_info_struct {
48 u32 bootFlags; /* Boot flags, compression etc. */
49 u32 imageNumber; /* Unique number, selects for boot etc. */
50 u32 loadAddress; /* Address program should be loaded to */
51 u32 length; /* Actual size of image */
52 u32 address; /* Image is executed from here */
53 char name[16]; /* Null terminated */
54 u32 headerBase; /* Flash Address of any stripped header */
55 u32 header_length; /* Length of header in memory */
56 u32 headerType; /* AIF, RLF, s-record etc. */
57 u32 checksum; /* Image checksum (inc. this struct) */
58 };
60 static u32 word_sum(void *words, int num)
61 {
62 u32 *p = words;
63 u32 sum = 0;
65 while (num--)
66 sum += *p++;
68 return sum;
69 }
71 static int
72 afs_read_footer(struct mtd_info *mtd, u_int *img_start, u_int *iis_start,
73 u_int off, u_int mask)
74 {
75 struct footer_struct fs;
76 u_int ptr = off + mtd->erasesize - sizeof(fs);
77 size_t sz;
78 int ret;
80 ret = mtd->read(mtd, ptr, sizeof(fs), &sz, (u_char *) &fs);
81 if (ret >= 0 && sz != sizeof(fs))
82 ret = -EINVAL;
84 if (ret < 0) {
85 printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
86 ptr, ret);
87 return ret;
88 }
90 ret = 1;
92 /*
93 * Does it contain the magic number?
94 */
95 if (fs.signature != 0xa0ffff9f)
96 ret = 0;
98 /*
99 * Check the checksum.
100 */
101 if (word_sum(&fs, sizeof(fs) / sizeof(u32)) != 0xffffffff)
102 ret = 0;
104 /*
105 * Don't touch the SIB.
106 */
107 if (fs.type == 2)
108 ret = 0;
110 *iis_start = fs.image_info_base & mask;
111 *img_start = fs.image_start & mask;
113 /*
114 * Check the image info base. This can not
115 * be located after the footer structure.
116 */
117 if (*iis_start >= ptr)
118 ret = 0;
120 /*
121 * Check the start of this image. The image
122 * data can not be located after this block.
123 */
124 if (*img_start > off)
125 ret = 0;
127 return ret;
128 }
130 static int
131 afs_read_iis(struct mtd_info *mtd, struct image_info_struct *iis, u_int ptr)
132 {
133 size_t sz;
134 int ret, i;
136 memset(iis, 0, sizeof(*iis));
137 ret = mtd->read(mtd, ptr, sizeof(*iis), &sz, (u_char *) iis);
138 if (ret < 0)
139 goto failed;
141 if (sz != sizeof(*iis)) {
142 ret = -EINVAL;
143 goto failed;
144 }
146 ret = 0;
148 /*
149 * Validate the name - it must be NUL terminated.
150 */
151 for (i = 0; i < sizeof(iis->name); i++)
152 if (iis->name[i] == '\0')
153 break;
155 if (i < sizeof(iis->name))
156 ret = 1;
158 return ret;
160 failed:
161 printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n",
162 ptr, ret);
163 return ret;
164 }
166 static int parse_afs_partitions(struct mtd_info *mtd,
167 struct mtd_partition **pparts,
168 unsigned long origin)
169 {
170 struct mtd_partition *parts;
171 u_int mask, off, idx, sz;
172 int ret = 0;
173 char *str;
175 /*
176 * This is the address mask; we use this to mask off out of
177 * range address bits.
178 */
179 mask = mtd->size - 1;
181 /*
182 * First, calculate the size of the array we need for the
183 * partition information. We include in this the size of
184 * the strings.
185 */
186 for (idx = off = sz = 0; off < mtd->size; off += mtd->erasesize) {
187 struct image_info_struct iis;
188 u_int iis_ptr, img_ptr;
190 ret = afs_read_footer(mtd, &img_ptr, &iis_ptr, off, mask);
191 if (ret < 0)
192 break;
193 if (ret == 0)
194 continue;
196 ret = afs_read_iis(mtd, &iis, iis_ptr);
197 if (ret < 0)
198 break;
199 if (ret == 0)
200 continue;
202 sz += sizeof(struct mtd_partition);
203 sz += strlen(iis.name) + 1;
204 idx += 1;
205 }
207 if (!sz)
208 return ret;
210 parts = kmalloc(sz, GFP_KERNEL);
211 if (!parts)
212 return -ENOMEM;
214 memset(parts, 0, sz);
215 str = (char *)(parts + idx);
217 /*
218 * Identify the partitions
219 */
220 for (idx = off = 0; off < mtd->size; off += mtd->erasesize) {
221 struct image_info_struct iis;
222 u_int iis_ptr, img_ptr;
224 /* Read the footer. */
225 ret = afs_read_footer(mtd, &img_ptr, &iis_ptr, off, mask);
226 if (ret < 0)
227 break;
228 if (ret == 0)
229 continue;
231 /* Read the image info block */
232 ret = afs_read_iis(mtd, &iis, iis_ptr);
233 if (ret < 0)
234 break;
235 if (ret == 0)
236 continue;
238 strcpy(str, iis.name);
240 parts[idx].name = str;
241 parts[idx].size = (iis.length + mtd->erasesize - 1) & ~(mtd->erasesize - 1);
242 parts[idx].offset = img_ptr;
243 parts[idx].mask_flags = 0;
245 printk(" mtd%d: at 0x%08x, %5dKB, %8u, %s\n",
246 idx, img_ptr, parts[idx].size / 1024,
247 iis.imageNumber, str);
249 idx += 1;
250 str = str + strlen(iis.name) + 1;
251 }
253 if (!idx) {
254 kfree(parts);
255 parts = NULL;
256 }
258 *pparts = parts;
259 return idx ? idx : ret;
260 }
262 static struct mtd_part_parser afs_parser = {
263 .owner = THIS_MODULE,
264 .parse_fn = parse_afs_partitions,
265 .name = "afs",
266 };
268 static int __init afs_parser_init(void)
269 {
270 return register_mtd_parser(&afs_parser);
271 }
273 static void __exit afs_parser_exit(void)
274 {
275 deregister_mtd_parser(&afs_parser);
276 }
278 module_init(afs_parser_init);
279 module_exit(afs_parser_exit);
282 MODULE_AUTHOR("ARM Ltd");
283 MODULE_DESCRIPTION("ARM Firmware Suite partition parser");
284 MODULE_LICENSE("GPL");