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[openwrt/svn-archive/archive.git] / target / linux / brcm47xx-2.6 / files / drivers / mtd / maps / bcm47xx-flash.c
1 /*
2 * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
4 * Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
5 *
6 * original functions for finding root filesystem from Mike Baker
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
16 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
19 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 *
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 675 Mass Ave, Cambridge, MA 02139, USA.
27 *
28 * Copyright 2001-2003, Broadcom Corporation
29 * All Rights Reserved.
30 *
31 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
32 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
33 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
34 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
35 *
36 * Flash mapping for BCM947XX boards
37 */
38
39 #include <linux/init.h>
40 #include <linux/module.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/mtd/mtd.h>
45 #include <linux/mtd/map.h>
46 #ifdef CONFIG_MTD_PARTITIONS
47 #include <linux/mtd/partitions.h>
48 #endif
49 #include <linux/squashfs_fs.h>
50 #include <linux/jffs2.h>
51 #include <linux/crc32.h>
52 #include <linux/ssb/ssb.h>
53 #include <asm/io.h>
54
55
56 #define TRX_MAGIC 0x30524448 /* "HDR0" */
57 #define TRX_VERSION 1
58 #define TRX_MAX_LEN 0x3A0000
59 #define TRX_NO_HEADER 1 /* Do not write TRX header */
60 #define TRX_GZ_FILES 0x2 /* Contains up to TRX_MAX_OFFSET individual gzip files */
61 #define TRX_MAX_OFFSET 3
62
63 struct trx_header {
64 u32 magic; /* "HDR0" */
65 u32 len; /* Length of file including header */
66 u32 crc32; /* 32-bit CRC from flag_version to end of file */
67 u32 flag_version; /* 0:15 flags, 16:31 version */
68 u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
69 };
70
71 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
72 #define NVRAM_SPACE 0x8000
73 #define WINDOW_ADDR 0x1fc00000
74 #define WINDOW_SIZE 0x400000
75 #define BUSWIDTH 2
76
77 extern struct ssb_bus ssb;
78 static struct mtd_info *bcm947xx_mtd;
79
80 static struct map_info bcm947xx_map = {
81 name: "Physically mapped flash",
82 size: WINDOW_SIZE,
83 bankwidth: BUSWIDTH,
84 phys: WINDOW_ADDR,
85 };
86
87 #ifdef CONFIG_MTD_PARTITIONS
88
89 static struct mtd_partition bcm947xx_parts[] = {
90 { name: "cfe", offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
91 { name: "linux", offset: 0, size: 0, },
92 { name: "rootfs", offset: 0, size: 0, },
93 { name: "nvram", offset: 0, size: 0, },
94 { name: "OpenWrt", offset: 0, size: 0, },
95 { name: NULL, },
96 };
97
98 static int __init
99 find_cfe_size(struct mtd_info *mtd, size_t size)
100 {
101 struct trx_header *trx;
102 unsigned char buf[512];
103 int off;
104 size_t len;
105 int blocksize;
106
107 trx = (struct trx_header *) buf;
108
109 blocksize = mtd->erasesize;
110 if (blocksize < 0x10000)
111 blocksize = 0x10000;
112
113 for (off = (128*1024); off < size; off += blocksize) {
114 memset(buf, 0xe5, sizeof(buf));
115
116 /*
117 * Read into buffer
118 */
119 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
120 len != sizeof(buf))
121 continue;
122
123 /* found a TRX header */
124 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
125 goto found;
126 }
127 }
128
129 printk(KERN_NOTICE
130 "%s: Couldn't find bootloader size\n",
131 mtd->name);
132 return -1;
133
134 found:
135 printk(KERN_NOTICE "bootloader size: %d\n", off);
136 return off;
137
138 }
139
140 /*
141 * Copied from mtdblock.c
142 *
143 * Cache stuff...
144 *
145 * Since typical flash erasable sectors are much larger than what Linux's
146 * buffer cache can handle, we must implement read-modify-write on flash
147 * sectors for each block write requests. To avoid over-erasing flash sectors
148 * and to speed things up, we locally cache a whole flash sector while it is
149 * being written to until a different sector is required.
150 */
151
152 static void erase_callback(struct erase_info *done)
153 {
154 wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
155 wake_up(wait_q);
156 }
157
158 static int erase_write (struct mtd_info *mtd, unsigned long pos,
159 int len, const char *buf)
160 {
161 struct erase_info erase;
162 DECLARE_WAITQUEUE(wait, current);
163 wait_queue_head_t wait_q;
164 size_t retlen;
165 int ret;
166
167 /*
168 * First, let's erase the flash block.
169 */
170
171 init_waitqueue_head(&wait_q);
172 erase.mtd = mtd;
173 erase.callback = erase_callback;
174 erase.addr = pos;
175 erase.len = len;
176 erase.priv = (u_long)&wait_q;
177
178 set_current_state(TASK_INTERRUPTIBLE);
179 add_wait_queue(&wait_q, &wait);
180
181 ret = mtd->erase(mtd, &erase);
182 if (ret) {
183 set_current_state(TASK_RUNNING);
184 remove_wait_queue(&wait_q, &wait);
185 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
186 "on \"%s\" failed\n",
187 pos, len, mtd->name);
188 return ret;
189 }
190
191 schedule(); /* Wait for erase to finish. */
192 remove_wait_queue(&wait_q, &wait);
193
194 /*
195 * Next, writhe data to flash.
196 */
197
198 ret = mtd->write (mtd, pos, len, &retlen, buf);
199 if (ret)
200 return ret;
201 if (retlen != len)
202 return -EIO;
203 return 0;
204 }
205
206
207
208
209 static int __init
210 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
211 {
212 struct trx_header trx, *trx2;
213 unsigned char buf[512], *block;
214 int off, blocksize;
215 u32 i, crc = ~0;
216 size_t len;
217 struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
218
219 blocksize = mtd->erasesize;
220 if (blocksize < 0x10000)
221 blocksize = 0x10000;
222
223 for (off = (128*1024); off < size; off += blocksize) {
224 memset(&trx, 0xe5, sizeof(trx));
225
226 /*
227 * Read into buffer
228 */
229 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
230 len != sizeof(trx))
231 continue;
232
233 /* found a TRX header */
234 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
235 part->offset = le32_to_cpu(trx.offsets[2]) ? :
236 le32_to_cpu(trx.offsets[1]);
237 part->size = le32_to_cpu(trx.len);
238
239 part->size -= part->offset;
240 part->offset += off;
241
242 goto found;
243 }
244 }
245
246 printk(KERN_NOTICE
247 "%s: Couldn't find root filesystem\n",
248 mtd->name);
249 return -1;
250
251 found:
252 if (part->size == 0)
253 return 0;
254
255 if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
256 return 0;
257
258 if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
259 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
260
261 /* Update the squashfs partition size based on the superblock info */
262 part->size = sb->bytes_used;
263 len = part->offset + part->size;
264 len += (mtd->erasesize - 1);
265 len &= ~(mtd->erasesize - 1);
266 part->size = len - part->offset;
267 } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
268 printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
269
270 /* Move the squashfs outside of the trx */
271 part->size = 0;
272 } else {
273 printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
274 return 0;
275 }
276
277 if (trx.len != part->offset + part->size - off) {
278 /* Update the trx offsets and length */
279 trx.len = part->offset + part->size - off;
280
281 /* Update the trx crc32 */
282 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
283 if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
284 return 0;
285 crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
286 }
287 trx.crc32 = crc;
288
289 /* read first eraseblock from the trx */
290 block = kmalloc(mtd->erasesize, GFP_KERNEL);
291 trx2 = (struct trx_header *) block;
292 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
293 printk("Error accessing the first trx eraseblock\n");
294 return 0;
295 }
296
297 printk("Updating TRX offsets and length:\n");
298 printk("old trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx2->offsets[0], trx2->offsets[1], trx2->offsets[2], trx2->len, trx2->crc32);
299 printk("new trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx.offsets[0], trx.offsets[1], trx.offsets[2], trx.len, trx.crc32);
300
301 /* Write updated trx header to the flash */
302 memcpy(block, &trx, sizeof(trx));
303 if (mtd->unlock)
304 mtd->unlock(mtd, off, mtd->erasesize);
305 erase_write(mtd, off, mtd->erasesize, block);
306 if (mtd->sync)
307 mtd->sync(mtd);
308 kfree(block);
309 printk("Done\n");
310 }
311
312 return part->size;
313 }
314
315 struct mtd_partition * __init
316 init_mtd_partitions(struct mtd_info *mtd, size_t size)
317 {
318 int cfe_size;
319
320 if ((cfe_size = find_cfe_size(mtd,size)) < 0)
321 return NULL;
322
323 /* boot loader */
324 bcm947xx_parts[0].offset = 0;
325 bcm947xx_parts[0].size = cfe_size;
326
327 /* nvram */
328 if (cfe_size != 384 * 1024) {
329 bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
330 bcm947xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
331 } else {
332 /* nvram (old 128kb config partition on netgear wgt634u) */
333 bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
334 bcm947xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
335 }
336
337 /* linux (kernel and rootfs) */
338 if (cfe_size != 384 * 1024) {
339 bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
340 bcm947xx_parts[1].size = bcm947xx_parts[3].offset -
341 bcm947xx_parts[1].offset;
342 } else {
343 /* do not count the elf loader, which is on one block */
344 bcm947xx_parts[1].offset = bcm947xx_parts[0].size +
345 bcm947xx_parts[3].size + mtd->erasesize;
346 bcm947xx_parts[1].size = size -
347 bcm947xx_parts[0].size -
348 (2*bcm947xx_parts[3].size) -
349 mtd->erasesize;
350 }
351
352 /* find and size rootfs */
353 if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
354 /* entirely jffs2 */
355 bcm947xx_parts[4].name = NULL;
356 bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset -
357 bcm947xx_parts[3].size;
358 } else {
359 /* legacy setup */
360 /* calculate leftover flash, and assign it to the jffs2 partition */
361 if (cfe_size != 384 * 1024) {
362 bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
363 bcm947xx_parts[2].size;
364 if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
365 bcm947xx_parts[4].offset += mtd->erasesize -
366 (bcm947xx_parts[4].offset % mtd->erasesize);
367 }
368 bcm947xx_parts[4].size = bcm947xx_parts[3].offset -
369 bcm947xx_parts[4].offset;
370 } else {
371 bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
372 bcm947xx_parts[2].size;
373 if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
374 bcm947xx_parts[4].offset += mtd->erasesize -
375 (bcm947xx_parts[4].offset % mtd->erasesize);
376 }
377 bcm947xx_parts[4].size = size - bcm947xx_parts[3].size -
378 bcm947xx_parts[4].offset;
379 }
380 }
381
382 return bcm947xx_parts;
383 }
384 #endif
385
386 int __init init_bcm947xx_map(void)
387 {
388 struct ssb_mipscore *mcore = &ssb.mipscore;
389 size_t size;
390 int ret = 0;
391 #ifdef CONFIG_MTD_PARTITIONS
392 struct mtd_partition *parts;
393 int i;
394 #endif
395 u32 window = mcore->flash_window;
396 u32 window_size = mcore->flash_window_size;
397
398 printk("flash init: 0x%08x 0x%08x\n", window, window_size);
399 bcm947xx_map.phys = window;
400 bcm947xx_map.size = window_size;
401 bcm947xx_map.virt = ioremap_nocache(window, window_size);
402
403 if (!bcm947xx_map.virt) {
404 printk("Failed to ioremap\n");
405 return -EIO;
406 }
407 simple_map_init(&bcm947xx_map);
408
409 if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
410 printk("Failed to do_map_probe\n");
411 iounmap((void *)bcm947xx_map.virt);
412 return -ENXIO;
413 }
414
415 bcm947xx_mtd->owner = THIS_MODULE;
416
417 size = bcm947xx_mtd->size;
418
419 printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
420
421 #ifdef CONFIG_MTD_PARTITIONS
422 parts = init_mtd_partitions(bcm947xx_mtd, size);
423 for (i = 0; parts[i].name; i++);
424 ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
425 if (ret) {
426 printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
427 goto fail;
428 }
429 #endif
430 return 0;
431
432 fail:
433 if (bcm947xx_mtd)
434 map_destroy(bcm947xx_mtd);
435 if (bcm947xx_map.virt)
436 iounmap((void *)bcm947xx_map.virt);
437 bcm947xx_map.virt = 0;
438 return ret;
439 }
440
441 void __exit cleanup_bcm947xx_map(void)
442 {
443 #ifdef CONFIG_MTD_PARTITIONS
444 del_mtd_partitions(bcm947xx_mtd);
445 #endif
446 map_destroy(bcm947xx_mtd);
447 iounmap((void *)bcm947xx_map.virt);
448 }
449
450 module_init(init_bcm947xx_map);
451 module_exit(cleanup_bcm947xx_map);
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