This source file includes following definitions.
- _writefield
- _readfield
- do_crypt
- geode_aes_crypt
- geode_setkey_cip
- geode_setkey_skcipher
- geode_encrypt
- geode_decrypt
- fallback_init_cip
- fallback_exit_cip
- geode_init_skcipher
- geode_exit_skcipher
- geode_skcipher_crypt
- geode_cbc_encrypt
- geode_cbc_decrypt
- geode_ecb_encrypt
- geode_ecb_decrypt
- geode_aes_remove
- geode_aes_probe
1
2
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 #include <crypto/internal/skcipher.h>
14
15 #include <linux/io.h>
16 #include <linux/delay.h>
17
18 #include "geode-aes.h"
19
20
21
22 static void __iomem *_iobase;
23 static spinlock_t lock;
24
25
26 static inline void
27 _writefield(u32 offset, const void *value)
28 {
29 int i;
30
31 for (i = 0; i < 4; i++)
32 iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));
33 }
34
35
36 static inline void
37 _readfield(u32 offset, void *value)
38 {
39 int i;
40
41 for (i = 0; i < 4; i++)
42 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
43 }
44
45 static int
46 do_crypt(const void *src, void *dst, u32 len, u32 flags)
47 {
48 u32 status;
49 u32 counter = AES_OP_TIMEOUT;
50
51 iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG);
52 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
53 iowrite32(len, _iobase + AES_LENA_REG);
54
55
56 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
57
58 do {
59 status = ioread32(_iobase + AES_INTR_REG);
60 cpu_relax();
61 } while (!(status & AES_INTRA_PENDING) && --counter);
62
63
64 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
65 return counter ? 0 : 1;
66 }
67
68 static void
69 geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,
70 void *dst, u32 len, u8 *iv, int mode, int dir)
71 {
72 u32 flags = 0;
73 unsigned long iflags;
74 int ret;
75
76
77
78
79
80
81 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
82
83 if (dir == AES_DIR_ENCRYPT)
84 flags |= AES_CTRL_ENCRYPT;
85
86
87
88 spin_lock_irqsave(&lock, iflags);
89
90 if (mode == AES_MODE_CBC) {
91 flags |= AES_CTRL_CBC;
92 _writefield(AES_WRITEIV0_REG, iv);
93 }
94
95 flags |= AES_CTRL_WRKEY;
96 _writefield(AES_WRITEKEY0_REG, tctx->key);
97
98 ret = do_crypt(src, dst, len, flags);
99 BUG_ON(ret);
100
101 if (mode == AES_MODE_CBC)
102 _readfield(AES_WRITEIV0_REG, iv);
103
104 spin_unlock_irqrestore(&lock, iflags);
105 }
106
107
108
109 static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
110 unsigned int len)
111 {
112 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
113 unsigned int ret;
114
115 tctx->keylen = len;
116
117 if (len == AES_KEYSIZE_128) {
118 memcpy(tctx->key, key, len);
119 return 0;
120 }
121
122 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
123
124 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
125 return -EINVAL;
126 }
127
128
129
130
131 tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
132 tctx->fallback.cip->base.crt_flags |=
133 (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
134
135 ret = crypto_cipher_setkey(tctx->fallback.cip, key, len);
136 if (ret) {
137 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
138 tfm->crt_flags |= (tctx->fallback.cip->base.crt_flags &
139 CRYPTO_TFM_RES_MASK);
140 }
141 return ret;
142 }
143
144 static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
145 unsigned int len)
146 {
147 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
148 unsigned int ret;
149
150 tctx->keylen = len;
151
152 if (len == AES_KEYSIZE_128) {
153 memcpy(tctx->key, key, len);
154 return 0;
155 }
156
157 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
158
159 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
160 return -EINVAL;
161 }
162
163
164
165
166 crypto_skcipher_clear_flags(tctx->fallback.skcipher,
167 CRYPTO_TFM_REQ_MASK);
168 crypto_skcipher_set_flags(tctx->fallback.skcipher,
169 crypto_skcipher_get_flags(tfm) &
170 CRYPTO_TFM_REQ_MASK);
171 ret = crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
172 crypto_skcipher_set_flags(tfm,
173 crypto_skcipher_get_flags(tctx->fallback.skcipher) &
174 CRYPTO_TFM_RES_MASK);
175 return ret;
176 }
177
178 static void
179 geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
180 {
181 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
182
183 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
184 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
185 return;
186 }
187
188 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
189 AES_MODE_ECB, AES_DIR_ENCRYPT);
190 }
191
192
193 static void
194 geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
195 {
196 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
197
198 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
199 crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
200 return;
201 }
202
203 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
204 AES_MODE_ECB, AES_DIR_DECRYPT);
205 }
206
207 static int fallback_init_cip(struct crypto_tfm *tfm)
208 {
209 const char *name = crypto_tfm_alg_name(tfm);
210 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
211
212 tctx->fallback.cip = crypto_alloc_cipher(name, 0,
213 CRYPTO_ALG_NEED_FALLBACK);
214
215 if (IS_ERR(tctx->fallback.cip)) {
216 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
217 return PTR_ERR(tctx->fallback.cip);
218 }
219
220 return 0;
221 }
222
223 static void fallback_exit_cip(struct crypto_tfm *tfm)
224 {
225 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
226
227 crypto_free_cipher(tctx->fallback.cip);
228 }
229
230 static struct crypto_alg geode_alg = {
231 .cra_name = "aes",
232 .cra_driver_name = "geode-aes",
233 .cra_priority = 300,
234 .cra_alignmask = 15,
235 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
236 CRYPTO_ALG_NEED_FALLBACK,
237 .cra_init = fallback_init_cip,
238 .cra_exit = fallback_exit_cip,
239 .cra_blocksize = AES_BLOCK_SIZE,
240 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
241 .cra_module = THIS_MODULE,
242 .cra_u = {
243 .cipher = {
244 .cia_min_keysize = AES_MIN_KEY_SIZE,
245 .cia_max_keysize = AES_MAX_KEY_SIZE,
246 .cia_setkey = geode_setkey_cip,
247 .cia_encrypt = geode_encrypt,
248 .cia_decrypt = geode_decrypt
249 }
250 }
251 };
252
253 static int geode_init_skcipher(struct crypto_skcipher *tfm)
254 {
255 const char *name = crypto_tfm_alg_name(&tfm->base);
256 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
257
258 tctx->fallback.skcipher =
259 crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |
260 CRYPTO_ALG_ASYNC);
261 if (IS_ERR(tctx->fallback.skcipher)) {
262 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
263 return PTR_ERR(tctx->fallback.skcipher);
264 }
265
266 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
267 crypto_skcipher_reqsize(tctx->fallback.skcipher));
268 return 0;
269 }
270
271 static void geode_exit_skcipher(struct crypto_skcipher *tfm)
272 {
273 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
274
275 crypto_free_skcipher(tctx->fallback.skcipher);
276 }
277
278 static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
279 {
280 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
281 const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
282 struct skcipher_walk walk;
283 unsigned int nbytes;
284 int err;
285
286 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
287 struct skcipher_request *subreq = skcipher_request_ctx(req);
288
289 *subreq = *req;
290 skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
291 if (dir == AES_DIR_DECRYPT)
292 return crypto_skcipher_decrypt(subreq);
293 else
294 return crypto_skcipher_encrypt(subreq);
295 }
296
297 err = skcipher_walk_virt(&walk, req, false);
298
299 while ((nbytes = walk.nbytes) != 0) {
300 geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,
301 round_down(nbytes, AES_BLOCK_SIZE),
302 walk.iv, mode, dir);
303 err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
304 }
305
306 return err;
307 }
308
309 static int geode_cbc_encrypt(struct skcipher_request *req)
310 {
311 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
312 }
313
314 static int geode_cbc_decrypt(struct skcipher_request *req)
315 {
316 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
317 }
318
319 static int geode_ecb_encrypt(struct skcipher_request *req)
320 {
321 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
322 }
323
324 static int geode_ecb_decrypt(struct skcipher_request *req)
325 {
326 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
327 }
328
329 static struct skcipher_alg geode_skcipher_algs[] = {
330 {
331 .base.cra_name = "cbc(aes)",
332 .base.cra_driver_name = "cbc-aes-geode",
333 .base.cra_priority = 400,
334 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
335 CRYPTO_ALG_NEED_FALLBACK,
336 .base.cra_blocksize = AES_BLOCK_SIZE,
337 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
338 .base.cra_alignmask = 15,
339 .base.cra_module = THIS_MODULE,
340 .init = geode_init_skcipher,
341 .exit = geode_exit_skcipher,
342 .setkey = geode_setkey_skcipher,
343 .encrypt = geode_cbc_encrypt,
344 .decrypt = geode_cbc_decrypt,
345 .min_keysize = AES_MIN_KEY_SIZE,
346 .max_keysize = AES_MAX_KEY_SIZE,
347 .ivsize = AES_BLOCK_SIZE,
348 }, {
349 .base.cra_name = "ecb(aes)",
350 .base.cra_driver_name = "ecb-aes-geode",
351 .base.cra_priority = 400,
352 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
353 CRYPTO_ALG_NEED_FALLBACK,
354 .base.cra_blocksize = AES_BLOCK_SIZE,
355 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
356 .base.cra_alignmask = 15,
357 .base.cra_module = THIS_MODULE,
358 .init = geode_init_skcipher,
359 .exit = geode_exit_skcipher,
360 .setkey = geode_setkey_skcipher,
361 .encrypt = geode_ecb_encrypt,
362 .decrypt = geode_ecb_decrypt,
363 .min_keysize = AES_MIN_KEY_SIZE,
364 .max_keysize = AES_MAX_KEY_SIZE,
365 },
366 };
367
368 static void geode_aes_remove(struct pci_dev *dev)
369 {
370 crypto_unregister_alg(&geode_alg);
371 crypto_unregister_skciphers(geode_skcipher_algs,
372 ARRAY_SIZE(geode_skcipher_algs));
373
374 pci_iounmap(dev, _iobase);
375 _iobase = NULL;
376
377 pci_release_regions(dev);
378 pci_disable_device(dev);
379 }
380
381
382 static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
383 {
384 int ret;
385
386 ret = pci_enable_device(dev);
387 if (ret)
388 return ret;
389
390 ret = pci_request_regions(dev, "geode-aes");
391 if (ret)
392 goto eenable;
393
394 _iobase = pci_iomap(dev, 0, 0);
395
396 if (_iobase == NULL) {
397 ret = -ENOMEM;
398 goto erequest;
399 }
400
401 spin_lock_init(&lock);
402
403
404 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
405
406 ret = crypto_register_alg(&geode_alg);
407 if (ret)
408 goto eiomap;
409
410 ret = crypto_register_skciphers(geode_skcipher_algs,
411 ARRAY_SIZE(geode_skcipher_algs));
412 if (ret)
413 goto ealg;
414
415 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
416 return 0;
417
418 ealg:
419 crypto_unregister_alg(&geode_alg);
420
421 eiomap:
422 pci_iounmap(dev, _iobase);
423
424 erequest:
425 pci_release_regions(dev);
426
427 eenable:
428 pci_disable_device(dev);
429
430 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
431 return ret;
432 }
433
434 static struct pci_device_id geode_aes_tbl[] = {
435 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
436 { 0, }
437 };
438
439 MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
440
441 static struct pci_driver geode_aes_driver = {
442 .name = "Geode LX AES",
443 .id_table = geode_aes_tbl,
444 .probe = geode_aes_probe,
445 .remove = geode_aes_remove,
446 };
447
448 module_pci_driver(geode_aes_driver);
449
450 MODULE_AUTHOR("Advanced Micro Devices, Inc.");
451 MODULE_DESCRIPTION("Geode LX Hardware AES driver");
452 MODULE_LICENSE("GPL");