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[openwrt/svn-archive/archive.git] / target / linux / generic-2.4 / files / crypto / ocf / c7108 / aes-7108.c
1 /*
2 * Copyright (C) 2006 Micronas USA
3 *
4 * 1. Redistributions of source code must retain the above copyright
5 * notice, this list of conditions and the following disclaimer.
6 * 2. Redistributions in binary form must reproduce the above copyright
7 * notice, this list of conditions and the following disclaimer in the
8 * documentation and/or other materials provided with the distribution.
9 * 3. The name of the author may not be used to endorse or promote products
10 * derived from this software without specific prior written permission.
11 *
12 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
13 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
14 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
15 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
18 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
19 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22 *
23 * Effort sponsored in part by the Defense Advanced Research Projects
24 * Agency (DARPA) and Air Force Research Laboratory, Air Force
25 * Materiel Command, USAF, under agreement number F30602-01-2-0537.
26 *
27 */
28
29 //#include <linux/config.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/list.h>
33 #include <linux/slab.h>
34 #include <linux/sched.h>
35 #include <linux/wait.h>
36 #include <linux/crypto.h>
37 #include <linux/mm.h>
38 #include <linux/skbuff.h>
39 #include <linux/random.h>
40 #include <asm/io.h>
41 #include <asm/delay.h>
42 //#include <asm/scatterlist.h>
43 #include <linux/scatterlist.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/highmem.h>
46 #include <cryptodev.h>
47 #include <uio.h>
48 #include <aes-7108.h>
49
50 /* Runtime mode */
51 static int c7108_crypto_mode = C7108_AES_CTRL_MODE_CTR;
52 //static int c7108_crypto_mode = C7108_AES_CTRL_MODE_CBC;
53
54 static int32_t c7108_id = -1;
55 static struct cipher_7108 **c7108_sessions = NULL;
56 static u_int32_t c7108_sesnum = 0;
57 static unsigned long iobar;
58
59 /* Crypto entry points */
60 static int c7108_process(void *, struct cryptop *, int);
61 static int c7108_newsession(void *, u_int32_t *, struct cryptoini *);
62 static int c7108_freesession(void *, u_int64_t);
63
64 /* Globals */
65 static int debug = 0;
66 static spinlock_t csr_mutex;
67
68 /* Generic controller-based lock */
69 #define AES_LOCK()\
70 spin_lock(&csr_mutex)
71 #define AES_UNLOCK()\
72 spin_unlock(&csr_mutex)
73
74 /* 7108 AES register access */
75 #define c7108_reg_wr8(a,d) iowrite8(d, (void*)(iobar+(a)))
76 #define c7108_reg_wr16(a,d) iowrite16(d, (void*)(iobar+(a)))
77 #define c7108_reg_wr32(a,d) iowrite32(d, (void*)(iobar+(a)))
78 #define c7108_reg_rd8(a) ioread8((void*)(iobar+(a)))
79 #define c7108_reg_rd16(a) ioread16((void*)(iobar+(a)))
80 #define c7108_reg_rd32(a) ioread32((void*)(iobar+(a)))
81
82 static int
83 c7108_xlate_key(int klen, u8* k8ptr, u32* k32ptr)
84 {
85 int i, nw=0;
86 nw = ((klen >= 256) ? 8 : (klen >= 192) ? 6 : 4);
87 for ( i = 0; i < nw; i++) {
88 k32ptr[i] = (k8ptr[i+3] << 24) | (k8ptr[i+2] << 16) |
89 (k8ptr[i+1] << 8) | k8ptr[i];
90
91 }
92 return 0;
93 }
94
95 static int
96 c7108_cache_key(int klen, u32* k32ptr, u8* k8ptr)
97 {
98 int i, nb=0;
99 u8* ptr = (u8*)k32ptr;
100 nb = ((klen >= 256) ? 32 : (klen >= 192) ? 24 : 16);
101 for ( i = 0; i < nb; i++)
102 k8ptr[i] = ptr[i];
103 return 0;
104 }
105
106 static int
107 c7108_aes_setup_dma(u32 src, u32 dst, u32 len)
108 {
109 if (len < 16) {
110 printk("len < 16\n");
111 return -10;
112 }
113 if (len % 16) {
114 printk("len not multiple of 16\n");
115 return -11;
116 }
117 c7108_reg_wr16(C7108_AES_DMA_SRC0_LO, (u16) src);
118 c7108_reg_wr16(C7108_AES_DMA_SRC0_HI, (u16)((src & 0xffff0000) >> 16));
119 c7108_reg_wr16(C7108_AES_DMA_DST0_LO, (u16) dst);
120 c7108_reg_wr16(C7108_AES_DMA_DST0_HI, (u16)((dst & 0xffff0000) >> 16));
121 c7108_reg_wr16(C7108_AES_DMA_LEN, (u16) ((len / 16) - 1));
122
123 return 0;
124 }
125
126 static int
127 c7108_aes_set_hw_iv(u8 iv[16])
128 {
129 c7108_reg_wr16(C7108_AES_IV0_LO, (u16) ((iv[1] << 8) | iv[0]));
130 c7108_reg_wr16(C7108_AES_IV0_HI, (u16) ((iv[3] << 8) | iv[2]));
131 c7108_reg_wr16(C7108_AES_IV1_LO, (u16) ((iv[5] << 8) | iv[4]));
132 c7108_reg_wr16(C7108_AES_IV1_HI, (u16) ((iv[7] << 8) | iv[6]));
133 c7108_reg_wr16(C7108_AES_IV2_LO, (u16) ((iv[9] << 8) | iv[8]));
134 c7108_reg_wr16(C7108_AES_IV2_HI, (u16) ((iv[11] << 8) | iv[10]));
135 c7108_reg_wr16(C7108_AES_IV3_LO, (u16) ((iv[13] << 8) | iv[12]));
136 c7108_reg_wr16(C7108_AES_IV3_HI, (u16) ((iv[15] << 8) | iv[14]));
137
138 return 0;
139 }
140
141 static void
142 c7108_aes_read_dkey(u32 * dkey)
143 {
144 dkey[0] = (c7108_reg_rd16(C7108_AES_EKEY0_HI) << 16) |
145 c7108_reg_rd16(C7108_AES_EKEY0_LO);
146 dkey[1] = (c7108_reg_rd16(C7108_AES_EKEY1_HI) << 16) |
147 c7108_reg_rd16(C7108_AES_EKEY1_LO);
148 dkey[2] = (c7108_reg_rd16(C7108_AES_EKEY2_HI) << 16) |
149 c7108_reg_rd16(C7108_AES_EKEY2_LO);
150 dkey[3] = (c7108_reg_rd16(C7108_AES_EKEY3_HI) << 16) |
151 c7108_reg_rd16(C7108_AES_EKEY3_LO);
152 dkey[4] = (c7108_reg_rd16(C7108_AES_EKEY4_HI) << 16) |
153 c7108_reg_rd16(C7108_AES_EKEY4_LO);
154 dkey[5] = (c7108_reg_rd16(C7108_AES_EKEY5_HI) << 16) |
155 c7108_reg_rd16(C7108_AES_EKEY5_LO);
156 dkey[6] = (c7108_reg_rd16(C7108_AES_EKEY6_HI) << 16) |
157 c7108_reg_rd16(C7108_AES_EKEY6_LO);
158 dkey[7] = (c7108_reg_rd16(C7108_AES_EKEY7_HI) << 16) |
159 c7108_reg_rd16(C7108_AES_EKEY7_LO);
160 }
161
162 static int
163 c7108_aes_cipher(int op,
164 u32 dst,
165 u32 src,
166 u32 len,
167 int klen,
168 u16 mode,
169 u32 key[8],
170 u8 iv[16])
171 {
172 int rv = 0, cnt=0;
173 u16 ctrl = 0, stat = 0;
174
175 AES_LOCK();
176
177 /* Setup key length */
178 if (klen == 128) {
179 ctrl |= C7108_AES_KEY_LEN_128;
180 } else if (klen == 192) {
181 ctrl |= C7108_AES_KEY_LEN_192;
182 } else if (klen == 256) {
183 ctrl |= C7108_AES_KEY_LEN_256;
184 } else {
185 AES_UNLOCK();
186 return -3;
187 }
188
189 /* Check opcode */
190 if (C7108_AES_ENCRYPT == op) {
191 ctrl |= C7108_AES_ENCRYPT;
192 } else if (C7108_AES_DECRYPT == op) {
193 ctrl |= C7108_AES_DECRYPT;
194 } else {
195 AES_UNLOCK();
196 return -4;
197 }
198
199 /* check mode */
200 if ( (mode != C7108_AES_CTRL_MODE_CBC) &&
201 (mode != C7108_AES_CTRL_MODE_CFB) &&
202 (mode != C7108_AES_CTRL_MODE_OFB) &&
203 (mode != C7108_AES_CTRL_MODE_CTR) &&
204 (mode != C7108_AES_CTRL_MODE_ECB) ) {
205 AES_UNLOCK();
206 return -5;
207 }
208
209 /* Now set mode */
210 ctrl |= mode;
211
212 /* For CFB, OFB, and CTR, neither backward key
213 * expansion nor key inversion is required.
214 */
215 if ( (C7108_AES_DECRYPT == op) &&
216 (C7108_AES_CTRL_MODE_CBC == mode ||
217 C7108_AES_CTRL_MODE_ECB == mode ) ){
218
219 /* Program Key */
220 c7108_reg_wr16(C7108_AES_KEY0_LO, (u16) key[4]);
221 c7108_reg_wr16(C7108_AES_KEY0_HI, (u16) (key[4] >> 16));
222 c7108_reg_wr16(C7108_AES_KEY1_LO, (u16) key[5]);
223 c7108_reg_wr16(C7108_AES_KEY1_HI, (u16) (key[5] >> 16));
224 c7108_reg_wr16(C7108_AES_KEY2_LO, (u16) key[6]);
225 c7108_reg_wr16(C7108_AES_KEY2_HI, (u16) (key[6] >> 16));
226 c7108_reg_wr16(C7108_AES_KEY3_LO, (u16) key[7]);
227 c7108_reg_wr16(C7108_AES_KEY3_HI, (u16) (key[7] >> 16));
228 c7108_reg_wr16(C7108_AES_KEY6_LO, (u16) key[2]);
229 c7108_reg_wr16(C7108_AES_KEY6_HI, (u16) (key[2] >> 16));
230 c7108_reg_wr16(C7108_AES_KEY7_LO, (u16) key[3]);
231 c7108_reg_wr16(C7108_AES_KEY7_HI, (u16) (key[3] >> 16));
232
233
234 if (192 == klen) {
235 c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[7]);
236 c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[7] >> 16));
237 c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[7]);
238 c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[7] >> 16));
239
240 } else if (256 == klen) {
241 /* 256 */
242 c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[0]);
243 c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[0] >> 16));
244 c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[1]);
245 c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[1] >> 16));
246
247 }
248
249 } else {
250 /* Program Key */
251 c7108_reg_wr16(C7108_AES_KEY0_LO, (u16) key[0]);
252 c7108_reg_wr16(C7108_AES_KEY0_HI, (u16) (key[0] >> 16));
253 c7108_reg_wr16(C7108_AES_KEY1_LO, (u16) key[1]);
254 c7108_reg_wr16(C7108_AES_KEY1_HI, (u16) (key[1] >> 16));
255 c7108_reg_wr16(C7108_AES_KEY2_LO, (u16) key[2]);
256 c7108_reg_wr16(C7108_AES_KEY2_HI, (u16) (key[2] >> 16));
257 c7108_reg_wr16(C7108_AES_KEY3_LO, (u16) key[3]);
258 c7108_reg_wr16(C7108_AES_KEY3_HI, (u16) (key[3] >> 16));
259 c7108_reg_wr16(C7108_AES_KEY4_LO, (u16) key[4]);
260 c7108_reg_wr16(C7108_AES_KEY4_HI, (u16) (key[4] >> 16));
261 c7108_reg_wr16(C7108_AES_KEY5_LO, (u16) key[5]);
262 c7108_reg_wr16(C7108_AES_KEY5_HI, (u16) (key[5] >> 16));
263 c7108_reg_wr16(C7108_AES_KEY6_LO, (u16) key[6]);
264 c7108_reg_wr16(C7108_AES_KEY6_HI, (u16) (key[6] >> 16));
265 c7108_reg_wr16(C7108_AES_KEY7_LO, (u16) key[7]);
266 c7108_reg_wr16(C7108_AES_KEY7_HI, (u16) (key[7] >> 16));
267
268 }
269
270 /* Set IV always */
271 c7108_aes_set_hw_iv(iv);
272
273 /* Program DMA addresses */
274 if ((rv = c7108_aes_setup_dma(src, dst, len)) < 0) {
275 AES_UNLOCK();
276 return rv;
277 }
278
279
280 /* Start AES cipher */
281 c7108_reg_wr16(C7108_AES_CTRL, ctrl | C7108_AES_GO);
282
283 //printk("Ctrl: 0x%x\n", ctrl | C7108_AES_GO);
284 do {
285 /* TODO: interrupt mode */
286 // printk("aes_stat=0x%x\n", stat);
287 //udelay(100);
288 } while ((cnt++ < 1000000) &&
289 !((stat=c7108_reg_rd16(C7108_AES_CTRL))&C7108_AES_OP_DONE));
290
291
292 if ((mode == C7108_AES_CTRL_MODE_ECB)||
293 (mode == C7108_AES_CTRL_MODE_CBC)) {
294 /* Save out key when the lock is held ... */
295 c7108_aes_read_dkey(key);
296 }
297
298 AES_UNLOCK();
299 return 0;
300
301 }
302
303 /*
304 * Generate a new crypto device session.
305 */
306 static int
307 c7108_newsession(void *arg, u_int32_t *sid, struct cryptoini *cri)
308 {
309 struct cipher_7108 **swd;
310 u_int32_t i;
311 char *algo;
312 int mode, xfm_type;
313
314 dprintk("%s()\n", __FUNCTION__);
315 if (sid == NULL || cri == NULL) {
316 dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
317 return EINVAL;
318 }
319
320 if (c7108_sessions) {
321 for (i = 1; i < c7108_sesnum; i++)
322 if (c7108_sessions[i] == NULL)
323 break;
324 } else
325 i = 1; /* NB: to silence compiler warning */
326
327 if (c7108_sessions == NULL || i == c7108_sesnum) {
328 if (c7108_sessions == NULL) {
329 i = 1; /* We leave c7108_sessions[0] empty */
330 c7108_sesnum = CRYPTO_SW_SESSIONS;
331 } else
332 c7108_sesnum *= 2;
333
334 swd = kmalloc(c7108_sesnum * sizeof(struct cipher_7108 *),
335 GFP_ATOMIC);
336 if (swd == NULL) {
337 /* Reset session number */
338 if (c7108_sesnum == CRYPTO_SW_SESSIONS)
339 c7108_sesnum = 0;
340 else
341 c7108_sesnum /= 2;
342 dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
343 return ENOBUFS;
344 }
345 memset(swd, 0, c7108_sesnum * sizeof(struct cipher_7108 *));
346
347 /* Copy existing sessions */
348 if (c7108_sessions) {
349 memcpy(swd, c7108_sessions,
350 (c7108_sesnum / 2) * sizeof(struct cipher_7108 *));
351 kfree(c7108_sessions);
352 }
353
354 c7108_sessions = swd;
355
356 }
357
358 swd = &c7108_sessions[i];
359 *sid = i;
360
361 while (cri) {
362 *swd = (struct cipher_7108 *)
363 kmalloc(sizeof(struct cipher_7108), GFP_ATOMIC);
364 if (*swd == NULL) {
365 c7108_freesession(NULL, i);
366 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
367 return ENOBUFS;
368 }
369 memset(*swd, 0, sizeof(struct cipher_7108));
370
371 algo = NULL;
372 mode = 0;
373 xfm_type = HW_TYPE_CIPHER;
374
375 switch (cri->cri_alg) {
376
377 case CRYPTO_AES_CBC:
378 algo = "aes";
379 mode = CRYPTO_TFM_MODE_CBC;
380 c7108_crypto_mode = C7108_AES_CTRL_MODE_CBC;
381 break;
382 #if 0
383 case CRYPTO_AES_CTR:
384 algo = "aes_ctr";
385 mode = CRYPTO_TFM_MODE_CBC;
386 c7108_crypto_mode = C7108_AES_CTRL_MODE_CTR;
387 break;
388 case CRYPTO_AES_ECB:
389 algo = "aes_ecb";
390 mode = CRYPTO_TFM_MODE_CBC;
391 c7108_crypto_mode = C7108_AES_CTRL_MODE_ECB;
392 break;
393 case CRYPTO_AES_OFB:
394 algo = "aes_ofb";
395 mode = CRYPTO_TFM_MODE_CBC;
396 c7108_crypto_mode = C7108_AES_CTRL_MODE_OFB;
397 break;
398 case CRYPTO_AES_CFB:
399 algo = "aes_cfb";
400 mode = CRYPTO_TFM_MODE_CBC;
401 c7108_crypto_mode = C7108_AES_CTRL_MODE_CFB;
402 break;
403 #endif
404 default:
405 printk("unsupported crypto algorithm: %d\n",
406 cri->cri_alg);
407 return -EINVAL;
408 break;
409 }
410
411
412 if (!algo || !*algo) {
413 printk("cypher_7108_crypto: Unknown algo 0x%x\n",
414 cri->cri_alg);
415 c7108_freesession(NULL, i);
416 return EINVAL;
417 }
418
419 if (xfm_type == HW_TYPE_CIPHER) {
420 if (debug) {
421 dprintk("%s key:", __FUNCTION__);
422 for (i = 0; i < (cri->cri_klen + 7) / 8; i++)
423 dprintk("%s0x%02x", (i % 8) ? " " : "\n ",
424 cri->cri_key[i]);
425 dprintk("\n");
426 }
427
428 } else if (xfm_type == SW_TYPE_HMAC ||
429 xfm_type == SW_TYPE_HASH) {
430 printk("cypher_7108_crypto: HMAC unsupported!\n");
431 return -EINVAL;
432 c7108_freesession(NULL, i);
433 } else {
434 printk("cypher_7108_crypto: "
435 "Unhandled xfm_type %d\n", xfm_type);
436 c7108_freesession(NULL, i);
437 return EINVAL;
438 }
439
440 (*swd)->cri_alg = cri->cri_alg;
441 (*swd)->xfm_type = xfm_type;
442
443 cri = cri->cri_next;
444 swd = &((*swd)->next);
445 }
446 return 0;
447 }
448
449 /*
450 * Free a session.
451 */
452 static int
453 c7108_freesession(void *arg, u_int64_t tid)
454 {
455 struct cipher_7108 *swd;
456 u_int32_t sid = CRYPTO_SESID2LID(tid);
457
458 dprintk("%s()\n", __FUNCTION__);
459 if (sid > c7108_sesnum || c7108_sessions == NULL ||
460 c7108_sessions[sid] == NULL) {
461 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
462 return(EINVAL);
463 }
464
465 /* Silently accept and return */
466 if (sid == 0)
467 return(0);
468
469 while ((swd = c7108_sessions[sid]) != NULL) {
470 c7108_sessions[sid] = swd->next;
471 kfree(swd);
472 }
473 return 0;
474 }
475
476 /*
477 * Process a hardware request.
478 */
479 static int
480 c7108_process(void *arg, struct cryptop *crp, int hint)
481 {
482 struct cryptodesc *crd;
483 struct cipher_7108 *sw;
484 u_int32_t lid;
485 int type;
486 u32 hwkey[8];
487
488 #define SCATTERLIST_MAX 16
489 struct scatterlist sg[SCATTERLIST_MAX];
490 int sg_num, sg_len, skip;
491 struct sk_buff *skb = NULL;
492 struct uio *uiop = NULL;
493
494 dprintk("%s()\n", __FUNCTION__);
495 /* Sanity check */
496 if (crp == NULL) {
497 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
498 return EINVAL;
499 }
500
501 crp->crp_etype = 0;
502
503 if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
504 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
505 crp->crp_etype = EINVAL;
506 goto done;
507 }
508
509 lid = crp->crp_sid & 0xffffffff;
510 if (lid >= c7108_sesnum || lid == 0 || c7108_sessions == NULL ||
511 c7108_sessions[lid] == NULL) {
512 crp->crp_etype = ENOENT;
513 dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
514 goto done;
515 }
516
517 /*
518 * do some error checking outside of the loop for SKB and IOV
519 * processing this leaves us with valid skb or uiop pointers
520 * for later
521 */
522 if (crp->crp_flags & CRYPTO_F_SKBUF) {
523 skb = (struct sk_buff *) crp->crp_buf;
524 if (skb_shinfo(skb)->nr_frags >= SCATTERLIST_MAX) {
525 printk("%s,%d: %d nr_frags > SCATTERLIST_MAX",
526 __FILE__, __LINE__,
527 skb_shinfo(skb)->nr_frags);
528 goto done;
529 }
530 } else if (crp->crp_flags & CRYPTO_F_IOV) {
531 uiop = (struct uio *) crp->crp_buf;
532 if (uiop->uio_iovcnt > SCATTERLIST_MAX) {
533 printk("%s,%d: %d uio_iovcnt > SCATTERLIST_MAX",
534 __FILE__, __LINE__,
535 uiop->uio_iovcnt);
536 goto done;
537 }
538 }
539
540 /* Go through crypto descriptors, processing as we go */
541 for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
542 /*
543 * Find the crypto context.
544 *
545 * XXX Note that the logic here prevents us from having
546 * XXX the same algorithm multiple times in a session
547 * XXX (or rather, we can but it won't give us the right
548 * XXX results). To do that, we'd need some way of differentiating
549 * XXX between the various instances of an algorithm (so we can
550 * XXX locate the correct crypto context).
551 */
552 for (sw = c7108_sessions[lid];
553 sw && sw->cri_alg != crd->crd_alg;
554 sw = sw->next)
555 ;
556
557 /* No such context ? */
558 if (sw == NULL) {
559 crp->crp_etype = EINVAL;
560 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
561 goto done;
562 }
563
564 skip = crd->crd_skip;
565
566 /*
567 * setup the SG list skip from the start of the buffer
568 */
569 memset(sg, 0, sizeof(sg));
570 if (crp->crp_flags & CRYPTO_F_SKBUF) {
571 int i, len;
572 type = CRYPTO_BUF_SKBUF;
573
574 sg_num = 0;
575 sg_len = 0;
576
577 if (skip < skb_headlen(skb)) {
578 //sg[sg_num].page = virt_to_page(skb->data + skip);
579 //sg[sg_num].offset = offset_in_page(skb->data + skip);
580 len = skb_headlen(skb) - skip;
581 if (len + sg_len > crd->crd_len)
582 len = crd->crd_len - sg_len;
583 //sg[sg_num].length = len;
584 sg_set_page(&sg[sg_num], virt_to_page(skb->data + skip), len, offset_in_page(skb->data + skip));
585 sg_len += sg[sg_num].length;
586 sg_num++;
587 skip = 0;
588 } else
589 skip -= skb_headlen(skb);
590
591 for (i = 0; sg_len < crd->crd_len &&
592 i < skb_shinfo(skb)->nr_frags &&
593 sg_num < SCATTERLIST_MAX; i++) {
594 if (skip < skb_shinfo(skb)->frags[i].size) {
595 //sg[sg_num].page = skb_shinfo(skb)->frags[i].page;
596 //sg[sg_num].offset = skb_shinfo(skb)->frags[i].page_offset + skip;
597 len = skb_shinfo(skb)->frags[i].size - skip;
598 if (len + sg_len > crd->crd_len)
599 len = crd->crd_len - sg_len;
600 //sg[sg_num].length = len;
601 sg_set_page(&sg[sg_num], skb_shinfo(skb)->frags[i].page, len, skb_shinfo(skb)->frags[i].page_offset + skip);
602 sg_len += sg[sg_num].length;
603 sg_num++;
604 skip = 0;
605 } else
606 skip -= skb_shinfo(skb)->frags[i].size;
607 }
608 } else if (crp->crp_flags & CRYPTO_F_IOV) {
609 int len;
610 type = CRYPTO_BUF_IOV;
611 sg_len = 0;
612 for (sg_num = 0; sg_len < crd->crd_len &&
613 sg_num < uiop->uio_iovcnt &&
614 sg_num < SCATTERLIST_MAX; sg_num++) {
615 if (skip < uiop->uio_iov[sg_num].iov_len) {
616 //sg[sg_num].page = virt_to_page(uiop->uio_iov[sg_num].iov_base+skip);
617 //sg[sg_num].offset = offset_in_page(uiop->uio_iov[sg_num].iov_base+skip);
618 len = uiop->uio_iov[sg_num].iov_len - skip;
619 if (len + sg_len > crd->crd_len)
620 len = crd->crd_len - sg_len;
621 //sg[sg_num].length = len;
622 sg_set_page(&sg[sg_num], virt_to_page(uiop->uio_iov[sg_num].iov_base+skip), len, offset_in_page(uiop->uio_iov[sg_num].iov_base+skip));
623 sg_len += sg[sg_num].length;
624 skip = 0;
625 } else
626 skip -= uiop->uio_iov[sg_num].iov_len;
627 }
628 } else {
629 type = CRYPTO_BUF_CONTIG;
630 //sg[0].page = virt_to_page(crp->crp_buf + skip);
631 //sg[0].offset = offset_in_page(crp->crp_buf + skip);
632 sg_len = (crp->crp_ilen - skip);
633 if (sg_len > crd->crd_len)
634 sg_len = crd->crd_len;
635 //sg[0].length = sg_len;
636 sg_set_page(&sg[0], virt_to_page(crp->crp_buf + skip), sg_len, offset_in_page(crp->crp_buf + skip));
637 sg_num = 1;
638 }
639
640
641 switch (sw->xfm_type) {
642
643 case HW_TYPE_CIPHER: {
644
645 unsigned char iv[64];
646 unsigned char *ivp = iv;
647 int i;
648 int ivsize = 16; /* fixed for AES */
649 int blocksize = 16; /* fixed for AES */
650
651 if (sg_len < blocksize) {
652 crp->crp_etype = EINVAL;
653 dprintk("%s,%d: EINVAL len %d < %d\n",
654 __FILE__, __LINE__,
655 sg_len,
656 blocksize);
657 goto done;
658 }
659
660 if (ivsize > sizeof(iv)) {
661 crp->crp_etype = EINVAL;
662 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
663 goto done;
664 }
665
666 if (crd->crd_flags & CRD_F_ENCRYPT) { /* encrypt */
667
668 if (crd->crd_flags & CRD_F_IV_EXPLICIT) {
669 ivp = crd->crd_iv;
670 } else {
671 get_random_bytes(ivp, ivsize);
672 }
673 /*
674 * do we have to copy the IV back to the buffer ?
675 */
676 if ((crd->crd_flags & CRD_F_IV_PRESENT) == 0) {
677 crypto_copyback(crp->crp_buf,
678 crd->crd_inject,
679 ivsize,
680 (caddr_t)ivp);
681 }
682
683 c7108_xlate_key(crd->crd_klen,
684 (u8*)crd->crd_key, (u32*)hwkey);
685
686 /* Encrypt SG list */
687 for (i = 0; i < sg_num; i++) {
688 sg[i].dma_address =
689 dma_map_single(NULL,
690 kmap(sg_page(&sg[i])) + sg[i].offset, sg_len, DMA_BIDIRECTIONAL);
691 #if 0
692 printk("sg[%d]:0x%08x, off 0x%08x "
693 "kmap 0x%08x phys 0x%08x\n",
694 i, sg[i].page, sg[i].offset,
695 kmap(sg[i].page) + sg[i].offset,
696 sg[i].dma_address);
697 #endif
698 c7108_aes_cipher(C7108_AES_ENCRYPT,
699 sg[i].dma_address,
700 sg[i].dma_address,
701 sg_len,
702 crd->crd_klen,
703 c7108_crypto_mode,
704 hwkey,
705 ivp);
706
707 if ((c7108_crypto_mode == C7108_AES_CTRL_MODE_CBC)||
708 (c7108_crypto_mode == C7108_AES_CTRL_MODE_ECB)) {
709 /* Read back expanded key and cache it in key
710 * context.
711 * NOTE: for ECB/CBC modes only (not CTR, CFB, OFB)
712 * where you set the key once.
713 */
714 c7108_cache_key(crd->crd_klen,
715 (u32*)hwkey, (u8*)crd->crd_key);
716 #if 0
717 printk("%s expanded key:", __FUNCTION__);
718 for (i = 0; i < (crd->crd_klen + 7) / 8; i++)
719 printk("%s0x%02x", (i % 8) ? " " : "\n ",
720 crd->crd_key[i]);
721 printk("\n");
722 #endif
723 }
724 }
725 }
726 else { /*decrypt */
727
728 if (crd->crd_flags & CRD_F_IV_EXPLICIT) {
729 ivp = crd->crd_iv;
730 } else {
731 crypto_copydata(crp->crp_buf, crd->crd_inject,
732 ivsize, (caddr_t)ivp);
733 }
734
735 c7108_xlate_key(crd->crd_klen,
736 (u8*)crd->crd_key, (u32*)hwkey);
737
738 /* Decrypt SG list */
739 for (i = 0; i < sg_num; i++) {
740 sg[i].dma_address =
741 dma_map_single(NULL,
742 kmap(sg_page(&sg[i])) + sg[i].offset,
743 sg_len, DMA_BIDIRECTIONAL);
744
745 #if 0
746 printk("sg[%d]:0x%08x, off 0x%08x "
747 "kmap 0x%08x phys 0x%08x\n",
748 i, sg[i].page, sg[i].offset,
749 kmap(sg[i].page) + sg[i].offset,
750 sg[i].dma_address);
751 #endif
752 c7108_aes_cipher(C7108_AES_DECRYPT,
753 sg[i].dma_address,
754 sg[i].dma_address,
755 sg_len,
756 crd->crd_klen,
757 c7108_crypto_mode,
758 hwkey,
759 ivp);
760 }
761 }
762 } break;
763 case SW_TYPE_HMAC:
764 case SW_TYPE_HASH:
765 crp->crp_etype = EINVAL;
766 goto done;
767 break;
768
769 case SW_TYPE_COMP:
770 crp->crp_etype = EINVAL;
771 goto done;
772 break;
773
774 default:
775 /* Unknown/unsupported algorithm */
776 dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
777 crp->crp_etype = EINVAL;
778 goto done;
779 }
780 }
781
782 done:
783 crypto_done(crp);
784 return 0;
785 }
786
787 static struct {
788 softc_device_decl sc_dev;
789 } a7108dev;
790
791 static device_method_t a7108_methods = {
792 /* crypto device methods */
793 DEVMETHOD(cryptodev_newsession, c7108_newsession),
794 DEVMETHOD(cryptodev_freesession, c7108_freesession),
795 DEVMETHOD(cryptodev_process, c7108_process),
796 DEVMETHOD(cryptodev_kprocess, NULL)
797 };
798
799 static int
800 cypher_7108_crypto_init(void)
801 {
802 dprintk("%s(%p)\n", __FUNCTION__, cypher_7108_crypto_init);
803
804 iobar = (unsigned long)ioremap(CCU_AES_REG_BASE, 0x4000);
805 printk("7108: AES @ 0x%08x (0x%08x phys) %s mode\n",
806 iobar, CCU_AES_REG_BASE,
807 c7108_crypto_mode & C7108_AES_CTRL_MODE_CBC ? "CBC" :
808 c7108_crypto_mode & C7108_AES_CTRL_MODE_ECB ? "ECB" :
809 c7108_crypto_mode & C7108_AES_CTRL_MODE_CTR ? "CTR" :
810 c7108_crypto_mode & C7108_AES_CTRL_MODE_CFB ? "CFB" :
811 c7108_crypto_mode & C7108_AES_CTRL_MODE_OFB ? "OFB" : "???");
812 csr_mutex = SPIN_LOCK_UNLOCKED;
813
814 memset(&a7108dev, 0, sizeof(a7108dev));
815 softc_device_init(&a7108dev, "aes7108", 0, a7108_methods);
816
817 c7108_id = crypto_get_driverid(softc_get_device(&a7108dev), CRYPTOCAP_F_HARDWARE);
818 if (c7108_id < 0)
819 panic("7108: crypto device cannot initialize!");
820
821 // crypto_register(c7108_id, CRYPTO_AES_CBC, 0, 0, c7108_newsession, c7108_freesession, c7108_process, NULL);
822 crypto_register(c7108_id, CRYPTO_AES_CBC, 0, 0);
823
824 return(0);
825 }
826
827 static void
828 cypher_7108_crypto_exit(void)
829 {
830 dprintk("%s()\n", __FUNCTION__);
831 crypto_unregister_all(c7108_id);
832 c7108_id = -1;
833 }
834
835 module_init(cypher_7108_crypto_init);
836 module_exit(cypher_7108_crypto_exit);
837
838 MODULE_LICENSE("Dual BSD/GPL");
839 MODULE_DESCRIPTION("Cypher 7108 Crypto (OCF module for kernel crypto)");
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