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9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/pci.h>
12#include <linux/pci_ids.h>
13#include <linux/crypto.h>
14#include <linux/spinlock.h>
15#include <crypto/algapi.h>
16#include <crypto/aes.h>
17
18#include <linux/io.h>
19#include <linux/delay.h>
20
21#include "geode-aes.h"
22
23
24
25static void __iomem *_iobase;
26static spinlock_t lock;
27
28
29static inline void
30_writefield(u32 offset, void *value)
31{
32 int i;
33 for (i = 0; i < 4; i++)
34 iowrite32(((u32 *) value)[i], _iobase + offset + (i * 4));
35}
36
37
38static inline void
39_readfield(u32 offset, void *value)
40{
41 int i;
42 for (i = 0; i < 4; i++)
43 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
44}
45
46static int
47do_crypt(void *src, void *dst, int len, u32 flags)
48{
49 u32 status;
50 u32 counter = AES_OP_TIMEOUT;
51
52 iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
53 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
54 iowrite32(len, _iobase + AES_LENA_REG);
55
56
57 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
58
59 do {
60 status = ioread32(_iobase + AES_INTR_REG);
61 cpu_relax();
62 } while (!(status & AES_INTRA_PENDING) && --counter);
63
64
65 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
66 return counter ? 0 : 1;
67}
68
69static unsigned int
70geode_aes_crypt(struct geode_aes_op *op)
71{
72 u32 flags = 0;
73 unsigned long iflags;
74 int ret;
75
76 if (op->len == 0)
77 return 0;
78
79
80
81
82
83
84 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
85
86 if (op->dir == AES_DIR_ENCRYPT)
87 flags |= AES_CTRL_ENCRYPT;
88
89
90
91 spin_lock_irqsave(&lock, iflags);
92
93 if (op->mode == AES_MODE_CBC) {
94 flags |= AES_CTRL_CBC;
95 _writefield(AES_WRITEIV0_REG, op->iv);
96 }
97
98 if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
99 flags |= AES_CTRL_WRKEY;
100 _writefield(AES_WRITEKEY0_REG, op->key);
101 }
102
103 ret = do_crypt(op->src, op->dst, op->len, flags);
104 BUG_ON(ret);
105
106 if (op->mode == AES_MODE_CBC)
107 _readfield(AES_WRITEIV0_REG, op->iv);
108
109 spin_unlock_irqrestore(&lock, iflags);
110
111 return op->len;
112}
113
114
115
116static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
117 unsigned int len)
118{
119 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
120 unsigned int ret;
121
122 op->keylen = len;
123
124 if (len == AES_KEYSIZE_128) {
125 memcpy(op->key, key, len);
126 return 0;
127 }
128
129 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
130
131 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
132 return -EINVAL;
133 }
134
135
136
137
138 op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
139 op->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
140
141 ret = crypto_cipher_setkey(op->fallback.cip, key, len);
142 if (ret) {
143 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
144 tfm->crt_flags |= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
145 }
146 return ret;
147}
148
149static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
150 unsigned int len)
151{
152 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
153 unsigned int ret;
154
155 op->keylen = len;
156
157 if (len == AES_KEYSIZE_128) {
158 memcpy(op->key, key, len);
159 return 0;
160 }
161
162 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
163
164 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
165 return -EINVAL;
166 }
167
168
169
170
171 op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
172 op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
173
174 ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
175 if (ret) {
176 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
177 tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
178 }
179 return ret;
180}
181
182static int fallback_blk_dec(struct blkcipher_desc *desc,
183 struct scatterlist *dst, struct scatterlist *src,
184 unsigned int nbytes)
185{
186 unsigned int ret;
187 struct crypto_blkcipher *tfm;
188 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
189
190 tfm = desc->tfm;
191 desc->tfm = op->fallback.blk;
192
193 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
194
195 desc->tfm = tfm;
196 return ret;
197}
198static int fallback_blk_enc(struct blkcipher_desc *desc,
199 struct scatterlist *dst, struct scatterlist *src,
200 unsigned int nbytes)
201{
202 unsigned int ret;
203 struct crypto_blkcipher *tfm;
204 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
205
206 tfm = desc->tfm;
207 desc->tfm = op->fallback.blk;
208
209 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
210
211 desc->tfm = tfm;
212 return ret;
213}
214
215static void
216geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
217{
218 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
219
220 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
221 crypto_cipher_encrypt_one(op->fallback.cip, out, in);
222 return;
223 }
224
225 op->src = (void *) in;
226 op->dst = (void *) out;
227 op->mode = AES_MODE_ECB;
228 op->flags = 0;
229 op->len = AES_BLOCK_SIZE;
230 op->dir = AES_DIR_ENCRYPT;
231
232 geode_aes_crypt(op);
233}
234
235
236static void
237geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
238{
239 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
240
241 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
242 crypto_cipher_decrypt_one(op->fallback.cip, out, in);
243 return;
244 }
245
246 op->src = (void *) in;
247 op->dst = (void *) out;
248 op->mode = AES_MODE_ECB;
249 op->flags = 0;
250 op->len = AES_BLOCK_SIZE;
251 op->dir = AES_DIR_DECRYPT;
252
253 geode_aes_crypt(op);
254}
255
256static int fallback_init_cip(struct crypto_tfm *tfm)
257{
258 const char *name = crypto_tfm_alg_name(tfm);
259 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
260
261 op->fallback.cip = crypto_alloc_cipher(name, 0,
262 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
263
264 if (IS_ERR(op->fallback.cip)) {
265 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
266 return PTR_ERR(op->fallback.cip);
267 }
268
269 return 0;
270}
271
272static void fallback_exit_cip(struct crypto_tfm *tfm)
273{
274 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
275
276 crypto_free_cipher(op->fallback.cip);
277 op->fallback.cip = NULL;
278}
279
280static struct crypto_alg geode_alg = {
281 .cra_name = "aes",
282 .cra_driver_name = "geode-aes",
283 .cra_priority = 300,
284 .cra_alignmask = 15,
285 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
286 CRYPTO_ALG_NEED_FALLBACK,
287 .cra_init = fallback_init_cip,
288 .cra_exit = fallback_exit_cip,
289 .cra_blocksize = AES_BLOCK_SIZE,
290 .cra_ctxsize = sizeof(struct geode_aes_op),
291 .cra_module = THIS_MODULE,
292 .cra_u = {
293 .cipher = {
294 .cia_min_keysize = AES_MIN_KEY_SIZE,
295 .cia_max_keysize = AES_MAX_KEY_SIZE,
296 .cia_setkey = geode_setkey_cip,
297 .cia_encrypt = geode_encrypt,
298 .cia_decrypt = geode_decrypt
299 }
300 }
301};
302
303static int
304geode_cbc_decrypt(struct blkcipher_desc *desc,
305 struct scatterlist *dst, struct scatterlist *src,
306 unsigned int nbytes)
307{
308 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
309 struct blkcipher_walk walk;
310 int err, ret;
311
312 if (unlikely(op->keylen != AES_KEYSIZE_128))
313 return fallback_blk_dec(desc, dst, src, nbytes);
314
315 blkcipher_walk_init(&walk, dst, src, nbytes);
316 err = blkcipher_walk_virt(desc, &walk);
317 op->iv = walk.iv;
318
319 while ((nbytes = walk.nbytes)) {
320 op->src = walk.src.virt.addr,
321 op->dst = walk.dst.virt.addr;
322 op->mode = AES_MODE_CBC;
323 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
324 op->dir = AES_DIR_DECRYPT;
325
326 ret = geode_aes_crypt(op);
327
328 nbytes -= ret;
329 err = blkcipher_walk_done(desc, &walk, nbytes);
330 }
331
332 return err;
333}
334
335static int
336geode_cbc_encrypt(struct blkcipher_desc *desc,
337 struct scatterlist *dst, struct scatterlist *src,
338 unsigned int nbytes)
339{
340 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
341 struct blkcipher_walk walk;
342 int err, ret;
343
344 if (unlikely(op->keylen != AES_KEYSIZE_128))
345 return fallback_blk_enc(desc, dst, src, nbytes);
346
347 blkcipher_walk_init(&walk, dst, src, nbytes);
348 err = blkcipher_walk_virt(desc, &walk);
349 op->iv = walk.iv;
350
351 while ((nbytes = walk.nbytes)) {
352 op->src = walk.src.virt.addr,
353 op->dst = walk.dst.virt.addr;
354 op->mode = AES_MODE_CBC;
355 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
356 op->dir = AES_DIR_ENCRYPT;
357
358 ret = geode_aes_crypt(op);
359 nbytes -= ret;
360 err = blkcipher_walk_done(desc, &walk, nbytes);
361 }
362
363 return err;
364}
365
366static int fallback_init_blk(struct crypto_tfm *tfm)
367{
368 const char *name = crypto_tfm_alg_name(tfm);
369 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
370
371 op->fallback.blk = crypto_alloc_blkcipher(name, 0,
372 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
373
374 if (IS_ERR(op->fallback.blk)) {
375 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
376 return PTR_ERR(op->fallback.blk);
377 }
378
379 return 0;
380}
381
382static void fallback_exit_blk(struct crypto_tfm *tfm)
383{
384 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
385
386 crypto_free_blkcipher(op->fallback.blk);
387 op->fallback.blk = NULL;
388}
389
390static struct crypto_alg geode_cbc_alg = {
391 .cra_name = "cbc(aes)",
392 .cra_driver_name = "cbc-aes-geode",
393 .cra_priority = 400,
394 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
395 CRYPTO_ALG_KERN_DRIVER_ONLY |
396 CRYPTO_ALG_NEED_FALLBACK,
397 .cra_init = fallback_init_blk,
398 .cra_exit = fallback_exit_blk,
399 .cra_blocksize = AES_BLOCK_SIZE,
400 .cra_ctxsize = sizeof(struct geode_aes_op),
401 .cra_alignmask = 15,
402 .cra_type = &crypto_blkcipher_type,
403 .cra_module = THIS_MODULE,
404 .cra_u = {
405 .blkcipher = {
406 .min_keysize = AES_MIN_KEY_SIZE,
407 .max_keysize = AES_MAX_KEY_SIZE,
408 .setkey = geode_setkey_blk,
409 .encrypt = geode_cbc_encrypt,
410 .decrypt = geode_cbc_decrypt,
411 .ivsize = AES_BLOCK_SIZE,
412 }
413 }
414};
415
416static int
417geode_ecb_decrypt(struct blkcipher_desc *desc,
418 struct scatterlist *dst, struct scatterlist *src,
419 unsigned int nbytes)
420{
421 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
422 struct blkcipher_walk walk;
423 int err, ret;
424
425 if (unlikely(op->keylen != AES_KEYSIZE_128))
426 return fallback_blk_dec(desc, dst, src, nbytes);
427
428 blkcipher_walk_init(&walk, dst, src, nbytes);
429 err = blkcipher_walk_virt(desc, &walk);
430
431 while ((nbytes = walk.nbytes)) {
432 op->src = walk.src.virt.addr,
433 op->dst = walk.dst.virt.addr;
434 op->mode = AES_MODE_ECB;
435 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
436 op->dir = AES_DIR_DECRYPT;
437
438 ret = geode_aes_crypt(op);
439 nbytes -= ret;
440 err = blkcipher_walk_done(desc, &walk, nbytes);
441 }
442
443 return err;
444}
445
446static int
447geode_ecb_encrypt(struct blkcipher_desc *desc,
448 struct scatterlist *dst, struct scatterlist *src,
449 unsigned int nbytes)
450{
451 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
452 struct blkcipher_walk walk;
453 int err, ret;
454
455 if (unlikely(op->keylen != AES_KEYSIZE_128))
456 return fallback_blk_enc(desc, dst, src, nbytes);
457
458 blkcipher_walk_init(&walk, dst, src, nbytes);
459 err = blkcipher_walk_virt(desc, &walk);
460
461 while ((nbytes = walk.nbytes)) {
462 op->src = walk.src.virt.addr,
463 op->dst = walk.dst.virt.addr;
464 op->mode = AES_MODE_ECB;
465 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
466 op->dir = AES_DIR_ENCRYPT;
467
468 ret = geode_aes_crypt(op);
469 nbytes -= ret;
470 ret = blkcipher_walk_done(desc, &walk, nbytes);
471 }
472
473 return err;
474}
475
476static struct crypto_alg geode_ecb_alg = {
477 .cra_name = "ecb(aes)",
478 .cra_driver_name = "ecb-aes-geode",
479 .cra_priority = 400,
480 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
481 CRYPTO_ALG_KERN_DRIVER_ONLY |
482 CRYPTO_ALG_NEED_FALLBACK,
483 .cra_init = fallback_init_blk,
484 .cra_exit = fallback_exit_blk,
485 .cra_blocksize = AES_BLOCK_SIZE,
486 .cra_ctxsize = sizeof(struct geode_aes_op),
487 .cra_alignmask = 15,
488 .cra_type = &crypto_blkcipher_type,
489 .cra_module = THIS_MODULE,
490 .cra_u = {
491 .blkcipher = {
492 .min_keysize = AES_MIN_KEY_SIZE,
493 .max_keysize = AES_MAX_KEY_SIZE,
494 .setkey = geode_setkey_blk,
495 .encrypt = geode_ecb_encrypt,
496 .decrypt = geode_ecb_decrypt,
497 }
498 }
499};
500
501static void geode_aes_remove(struct pci_dev *dev)
502{
503 crypto_unregister_alg(&geode_alg);
504 crypto_unregister_alg(&geode_ecb_alg);
505 crypto_unregister_alg(&geode_cbc_alg);
506
507 pci_iounmap(dev, _iobase);
508 _iobase = NULL;
509
510 pci_release_regions(dev);
511 pci_disable_device(dev);
512}
513
514
515static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
516{
517 int ret;
518 ret = pci_enable_device(dev);
519 if (ret)
520 return ret;
521
522 ret = pci_request_regions(dev, "geode-aes");
523 if (ret)
524 goto eenable;
525
526 _iobase = pci_iomap(dev, 0, 0);
527
528 if (_iobase == NULL) {
529 ret = -ENOMEM;
530 goto erequest;
531 }
532
533 spin_lock_init(&lock);
534
535
536 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
537
538 ret = crypto_register_alg(&geode_alg);
539 if (ret)
540 goto eiomap;
541
542 ret = crypto_register_alg(&geode_ecb_alg);
543 if (ret)
544 goto ealg;
545
546 ret = crypto_register_alg(&geode_cbc_alg);
547 if (ret)
548 goto eecb;
549
550 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
551 return 0;
552
553 eecb:
554 crypto_unregister_alg(&geode_ecb_alg);
555
556 ealg:
557 crypto_unregister_alg(&geode_alg);
558
559 eiomap:
560 pci_iounmap(dev, _iobase);
561
562 erequest:
563 pci_release_regions(dev);
564
565 eenable:
566 pci_disable_device(dev);
567
568 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
569 return ret;
570}
571
572static struct pci_device_id geode_aes_tbl[] = {
573 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), } ,
574 { 0, }
575};
576
577MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
578
579static struct pci_driver geode_aes_driver = {
580 .name = "Geode LX AES",
581 .id_table = geode_aes_tbl,
582 .probe = geode_aes_probe,
583 .remove = geode_aes_remove,
584};
585
586module_pci_driver(geode_aes_driver);
587
588MODULE_AUTHOR("Advanced Micro Devices, Inc.");
589MODULE_DESCRIPTION("Geode LX Hardware AES driver");
590MODULE_LICENSE("GPL");
591
