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1 /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 */
8
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/* Static structures */
24
25static void __iomem *_iobase;
26static spinlock_t lock;
27
28/* Write a 128 bit field (either a writable key or IV) */
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/* Read a 128 bit field (either a writable key or IV) */
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 /* Start the operation */
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 /* Clear the event */
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 /* If the source and destination is the same, then
80 * we need to turn on the coherent flags, otherwise
81 * we don't need to worry
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 /* Start the critical section */
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/* CRYPTO-API Functions */
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 /* not supported at all */
131 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
132 return -EINVAL;
133 }
134
135 /*
136 * The requested key size is not supported by HW, do a fallback
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 /* not supported at all */
164 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
165 return -EINVAL;
166 }
167
168 /*
169 * The requested key size is not supported by HW, do a fallback
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_MIN_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_MIN_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 = tfm->__crt_alg->cra_name;
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_MIN_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_MIN_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_MIN_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 = tfm->__crt_alg->cra_name;
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_MIN_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_IV_LENGTH,
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_MIN_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_MIN_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_MIN_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 /* Clear any pending activity */
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 printk(KERN_NOTICE "geode-aes: 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 printk(KERN_ERR "geode-aes: 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");
1// SPDX-License-Identifier: GPL-2.0-or-later
2 /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
3 */
4
5#include <linux/module.h>
6#include <linux/kernel.h>
7#include <linux/pci.h>
8#include <linux/pci_ids.h>
9#include <linux/crypto.h>
10#include <linux/spinlock.h>
11#include <crypto/algapi.h>
12#include <crypto/aes.h>
13
14#include <linux/io.h>
15#include <linux/delay.h>
16
17#include "geode-aes.h"
18
19/* Static structures */
20
21static void __iomem *_iobase;
22static spinlock_t lock;
23
24/* Write a 128 bit field (either a writable key or IV) */
25static inline void
26_writefield(u32 offset, void *value)
27{
28 int i;
29
30 for (i = 0; i < 4; i++)
31 iowrite32(((u32 *) value)[i], _iobase + offset + (i * 4));
32}
33
34/* Read a 128 bit field (either a writable key or IV) */
35static inline void
36_readfield(u32 offset, void *value)
37{
38 int i;
39
40 for (i = 0; i < 4; i++)
41 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
42}
43
44static int
45do_crypt(void *src, void *dst, int len, u32 flags)
46{
47 u32 status;
48 u32 counter = AES_OP_TIMEOUT;
49
50 iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
51 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
52 iowrite32(len, _iobase + AES_LENA_REG);
53
54 /* Start the operation */
55 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
56
57 do {
58 status = ioread32(_iobase + AES_INTR_REG);
59 cpu_relax();
60 } while (!(status & AES_INTRA_PENDING) && --counter);
61
62 /* Clear the event */
63 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
64 return counter ? 0 : 1;
65}
66
67static unsigned int
68geode_aes_crypt(struct geode_aes_op *op)
69{
70 u32 flags = 0;
71 unsigned long iflags;
72 int ret;
73
74 if (op->len == 0)
75 return 0;
76
77 /* If the source and destination is the same, then
78 * we need to turn on the coherent flags, otherwise
79 * we don't need to worry
80 */
81
82 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
83
84 if (op->dir == AES_DIR_ENCRYPT)
85 flags |= AES_CTRL_ENCRYPT;
86
87 /* Start the critical section */
88
89 spin_lock_irqsave(&lock, iflags);
90
91 if (op->mode == AES_MODE_CBC) {
92 flags |= AES_CTRL_CBC;
93 _writefield(AES_WRITEIV0_REG, op->iv);
94 }
95
96 if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
97 flags |= AES_CTRL_WRKEY;
98 _writefield(AES_WRITEKEY0_REG, op->key);
99 }
100
101 ret = do_crypt(op->src, op->dst, op->len, flags);
102 BUG_ON(ret);
103
104 if (op->mode == AES_MODE_CBC)
105 _readfield(AES_WRITEIV0_REG, op->iv);
106
107 spin_unlock_irqrestore(&lock, iflags);
108
109 return op->len;
110}
111
112/* CRYPTO-API Functions */
113
114static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
115 unsigned int len)
116{
117 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
118 unsigned int ret;
119
120 op->keylen = len;
121
122 if (len == AES_KEYSIZE_128) {
123 memcpy(op->key, key, len);
124 return 0;
125 }
126
127 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
128 /* not supported at all */
129 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
130 return -EINVAL;
131 }
132
133 /*
134 * The requested key size is not supported by HW, do a fallback
135 */
136 op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
137 op->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
138
139 ret = crypto_cipher_setkey(op->fallback.cip, key, len);
140 if (ret) {
141 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
142 tfm->crt_flags |= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
143 }
144 return ret;
145}
146
147static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
148 unsigned int len)
149{
150 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
151 unsigned int ret;
152
153 op->keylen = len;
154
155 if (len == AES_KEYSIZE_128) {
156 memcpy(op->key, key, len);
157 return 0;
158 }
159
160 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
161 /* not supported at all */
162 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
163 return -EINVAL;
164 }
165
166 /*
167 * The requested key size is not supported by HW, do a fallback
168 */
169 op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
170 op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
171
172 ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
173 if (ret) {
174 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
175 tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
176 }
177 return ret;
178}
179
180static int fallback_blk_dec(struct blkcipher_desc *desc,
181 struct scatterlist *dst, struct scatterlist *src,
182 unsigned int nbytes)
183{
184 unsigned int ret;
185 struct crypto_blkcipher *tfm;
186 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
187
188 tfm = desc->tfm;
189 desc->tfm = op->fallback.blk;
190
191 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
192
193 desc->tfm = tfm;
194 return ret;
195}
196static int fallback_blk_enc(struct blkcipher_desc *desc,
197 struct scatterlist *dst, struct scatterlist *src,
198 unsigned int nbytes)
199{
200 unsigned int ret;
201 struct crypto_blkcipher *tfm;
202 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
203
204 tfm = desc->tfm;
205 desc->tfm = op->fallback.blk;
206
207 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
208
209 desc->tfm = tfm;
210 return ret;
211}
212
213static void
214geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
215{
216 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
217
218 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
219 crypto_cipher_encrypt_one(op->fallback.cip, out, in);
220 return;
221 }
222
223 op->src = (void *) in;
224 op->dst = (void *) out;
225 op->mode = AES_MODE_ECB;
226 op->flags = 0;
227 op->len = AES_BLOCK_SIZE;
228 op->dir = AES_DIR_ENCRYPT;
229
230 geode_aes_crypt(op);
231}
232
233
234static void
235geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
236{
237 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
238
239 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
240 crypto_cipher_decrypt_one(op->fallback.cip, out, in);
241 return;
242 }
243
244 op->src = (void *) in;
245 op->dst = (void *) out;
246 op->mode = AES_MODE_ECB;
247 op->flags = 0;
248 op->len = AES_BLOCK_SIZE;
249 op->dir = AES_DIR_DECRYPT;
250
251 geode_aes_crypt(op);
252}
253
254static int fallback_init_cip(struct crypto_tfm *tfm)
255{
256 const char *name = crypto_tfm_alg_name(tfm);
257 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
258
259 op->fallback.cip = crypto_alloc_cipher(name, 0,
260 CRYPTO_ALG_NEED_FALLBACK);
261
262 if (IS_ERR(op->fallback.cip)) {
263 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
264 return PTR_ERR(op->fallback.cip);
265 }
266
267 return 0;
268}
269
270static void fallback_exit_cip(struct crypto_tfm *tfm)
271{
272 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
273
274 crypto_free_cipher(op->fallback.cip);
275 op->fallback.cip = NULL;
276}
277
278static struct crypto_alg geode_alg = {
279 .cra_name = "aes",
280 .cra_driver_name = "geode-aes",
281 .cra_priority = 300,
282 .cra_alignmask = 15,
283 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
284 CRYPTO_ALG_NEED_FALLBACK,
285 .cra_init = fallback_init_cip,
286 .cra_exit = fallback_exit_cip,
287 .cra_blocksize = AES_BLOCK_SIZE,
288 .cra_ctxsize = sizeof(struct geode_aes_op),
289 .cra_module = THIS_MODULE,
290 .cra_u = {
291 .cipher = {
292 .cia_min_keysize = AES_MIN_KEY_SIZE,
293 .cia_max_keysize = AES_MAX_KEY_SIZE,
294 .cia_setkey = geode_setkey_cip,
295 .cia_encrypt = geode_encrypt,
296 .cia_decrypt = geode_decrypt
297 }
298 }
299};
300
301static int
302geode_cbc_decrypt(struct blkcipher_desc *desc,
303 struct scatterlist *dst, struct scatterlist *src,
304 unsigned int nbytes)
305{
306 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
307 struct blkcipher_walk walk;
308 int err, ret;
309
310 if (unlikely(op->keylen != AES_KEYSIZE_128))
311 return fallback_blk_dec(desc, dst, src, nbytes);
312
313 blkcipher_walk_init(&walk, dst, src, nbytes);
314 err = blkcipher_walk_virt(desc, &walk);
315 op->iv = walk.iv;
316
317 while ((nbytes = walk.nbytes)) {
318 op->src = walk.src.virt.addr,
319 op->dst = walk.dst.virt.addr;
320 op->mode = AES_MODE_CBC;
321 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
322 op->dir = AES_DIR_DECRYPT;
323
324 ret = geode_aes_crypt(op);
325
326 nbytes -= ret;
327 err = blkcipher_walk_done(desc, &walk, nbytes);
328 }
329
330 return err;
331}
332
333static int
334geode_cbc_encrypt(struct blkcipher_desc *desc,
335 struct scatterlist *dst, struct scatterlist *src,
336 unsigned int nbytes)
337{
338 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
339 struct blkcipher_walk walk;
340 int err, ret;
341
342 if (unlikely(op->keylen != AES_KEYSIZE_128))
343 return fallback_blk_enc(desc, dst, src, nbytes);
344
345 blkcipher_walk_init(&walk, dst, src, nbytes);
346 err = blkcipher_walk_virt(desc, &walk);
347 op->iv = walk.iv;
348
349 while ((nbytes = walk.nbytes)) {
350 op->src = walk.src.virt.addr,
351 op->dst = walk.dst.virt.addr;
352 op->mode = AES_MODE_CBC;
353 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
354 op->dir = AES_DIR_ENCRYPT;
355
356 ret = geode_aes_crypt(op);
357 nbytes -= ret;
358 err = blkcipher_walk_done(desc, &walk, nbytes);
359 }
360
361 return err;
362}
363
364static int fallback_init_blk(struct crypto_tfm *tfm)
365{
366 const char *name = crypto_tfm_alg_name(tfm);
367 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
368
369 op->fallback.blk = crypto_alloc_blkcipher(name, 0,
370 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
371
372 if (IS_ERR(op->fallback.blk)) {
373 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
374 return PTR_ERR(op->fallback.blk);
375 }
376
377 return 0;
378}
379
380static void fallback_exit_blk(struct crypto_tfm *tfm)
381{
382 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
383
384 crypto_free_blkcipher(op->fallback.blk);
385 op->fallback.blk = NULL;
386}
387
388static struct crypto_alg geode_cbc_alg = {
389 .cra_name = "cbc(aes)",
390 .cra_driver_name = "cbc-aes-geode",
391 .cra_priority = 400,
392 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
393 CRYPTO_ALG_KERN_DRIVER_ONLY |
394 CRYPTO_ALG_NEED_FALLBACK,
395 .cra_init = fallback_init_blk,
396 .cra_exit = fallback_exit_blk,
397 .cra_blocksize = AES_BLOCK_SIZE,
398 .cra_ctxsize = sizeof(struct geode_aes_op),
399 .cra_alignmask = 15,
400 .cra_type = &crypto_blkcipher_type,
401 .cra_module = THIS_MODULE,
402 .cra_u = {
403 .blkcipher = {
404 .min_keysize = AES_MIN_KEY_SIZE,
405 .max_keysize = AES_MAX_KEY_SIZE,
406 .setkey = geode_setkey_blk,
407 .encrypt = geode_cbc_encrypt,
408 .decrypt = geode_cbc_decrypt,
409 .ivsize = AES_BLOCK_SIZE,
410 }
411 }
412};
413
414static int
415geode_ecb_decrypt(struct blkcipher_desc *desc,
416 struct scatterlist *dst, struct scatterlist *src,
417 unsigned int nbytes)
418{
419 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
420 struct blkcipher_walk walk;
421 int err, ret;
422
423 if (unlikely(op->keylen != AES_KEYSIZE_128))
424 return fallback_blk_dec(desc, dst, src, nbytes);
425
426 blkcipher_walk_init(&walk, dst, src, nbytes);
427 err = blkcipher_walk_virt(desc, &walk);
428
429 while ((nbytes = walk.nbytes)) {
430 op->src = walk.src.virt.addr,
431 op->dst = walk.dst.virt.addr;
432 op->mode = AES_MODE_ECB;
433 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
434 op->dir = AES_DIR_DECRYPT;
435
436 ret = geode_aes_crypt(op);
437 nbytes -= ret;
438 err = blkcipher_walk_done(desc, &walk, nbytes);
439 }
440
441 return err;
442}
443
444static int
445geode_ecb_encrypt(struct blkcipher_desc *desc,
446 struct scatterlist *dst, struct scatterlist *src,
447 unsigned int nbytes)
448{
449 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
450 struct blkcipher_walk walk;
451 int err, ret;
452
453 if (unlikely(op->keylen != AES_KEYSIZE_128))
454 return fallback_blk_enc(desc, dst, src, nbytes);
455
456 blkcipher_walk_init(&walk, dst, src, nbytes);
457 err = blkcipher_walk_virt(desc, &walk);
458
459 while ((nbytes = walk.nbytes)) {
460 op->src = walk.src.virt.addr,
461 op->dst = walk.dst.virt.addr;
462 op->mode = AES_MODE_ECB;
463 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
464 op->dir = AES_DIR_ENCRYPT;
465
466 ret = geode_aes_crypt(op);
467 nbytes -= ret;
468 ret = blkcipher_walk_done(desc, &walk, nbytes);
469 }
470
471 return err;
472}
473
474static struct crypto_alg geode_ecb_alg = {
475 .cra_name = "ecb(aes)",
476 .cra_driver_name = "ecb-aes-geode",
477 .cra_priority = 400,
478 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
479 CRYPTO_ALG_KERN_DRIVER_ONLY |
480 CRYPTO_ALG_NEED_FALLBACK,
481 .cra_init = fallback_init_blk,
482 .cra_exit = fallback_exit_blk,
483 .cra_blocksize = AES_BLOCK_SIZE,
484 .cra_ctxsize = sizeof(struct geode_aes_op),
485 .cra_alignmask = 15,
486 .cra_type = &crypto_blkcipher_type,
487 .cra_module = THIS_MODULE,
488 .cra_u = {
489 .blkcipher = {
490 .min_keysize = AES_MIN_KEY_SIZE,
491 .max_keysize = AES_MAX_KEY_SIZE,
492 .setkey = geode_setkey_blk,
493 .encrypt = geode_ecb_encrypt,
494 .decrypt = geode_ecb_decrypt,
495 }
496 }
497};
498
499static void geode_aes_remove(struct pci_dev *dev)
500{
501 crypto_unregister_alg(&geode_alg);
502 crypto_unregister_alg(&geode_ecb_alg);
503 crypto_unregister_alg(&geode_cbc_alg);
504
505 pci_iounmap(dev, _iobase);
506 _iobase = NULL;
507
508 pci_release_regions(dev);
509 pci_disable_device(dev);
510}
511
512
513static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
514{
515 int ret;
516
517 ret = pci_enable_device(dev);
518 if (ret)
519 return ret;
520
521 ret = pci_request_regions(dev, "geode-aes");
522 if (ret)
523 goto eenable;
524
525 _iobase = pci_iomap(dev, 0, 0);
526
527 if (_iobase == NULL) {
528 ret = -ENOMEM;
529 goto erequest;
530 }
531
532 spin_lock_init(&lock);
533
534 /* Clear any pending activity */
535 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
536
537 ret = crypto_register_alg(&geode_alg);
538 if (ret)
539 goto eiomap;
540
541 ret = crypto_register_alg(&geode_ecb_alg);
542 if (ret)
543 goto ealg;
544
545 ret = crypto_register_alg(&geode_cbc_alg);
546 if (ret)
547 goto eecb;
548
549 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
550 return 0;
551
552 eecb:
553 crypto_unregister_alg(&geode_ecb_alg);
554
555 ealg:
556 crypto_unregister_alg(&geode_alg);
557
558 eiomap:
559 pci_iounmap(dev, _iobase);
560
561 erequest:
562 pci_release_regions(dev);
563
564 eenable:
565 pci_disable_device(dev);
566
567 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
568 return ret;
569}
570
571static struct pci_device_id geode_aes_tbl[] = {
572 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
573 { 0, }
574};
575
576MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
577
578static struct pci_driver geode_aes_driver = {
579 .name = "Geode LX AES",
580 .id_table = geode_aes_tbl,
581 .probe = geode_aes_probe,
582 .remove = geode_aes_remove,
583};
584
585module_pci_driver(geode_aes_driver);
586
587MODULE_AUTHOR("Advanced Micro Devices, Inc.");
588MODULE_DESCRIPTION("Geode LX Hardware AES driver");
589MODULE_LICENSE("GPL");