Commit | Line | Data |
---|---|---|
9fe757b0 JC |
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> | |
9fe757b0 JC |
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 | ||
17 | #include <asm/io.h> | |
18 | #include <asm/delay.h> | |
19 | ||
20 | #include "geode-aes.h" | |
21 | ||
22 | /* Register definitions */ | |
23 | ||
24 | #define AES_CTRLA_REG 0x0000 | |
25 | ||
26 | #define AES_CTRL_START 0x01 | |
27 | #define AES_CTRL_DECRYPT 0x00 | |
28 | #define AES_CTRL_ENCRYPT 0x02 | |
29 | #define AES_CTRL_WRKEY 0x04 | |
30 | #define AES_CTRL_DCA 0x08 | |
31 | #define AES_CTRL_SCA 0x10 | |
32 | #define AES_CTRL_CBC 0x20 | |
33 | ||
34 | #define AES_INTR_REG 0x0008 | |
35 | ||
36 | #define AES_INTRA_PENDING (1 << 16) | |
37 | #define AES_INTRB_PENDING (1 << 17) | |
38 | ||
39 | #define AES_INTR_PENDING (AES_INTRA_PENDING | AES_INTRB_PENDING) | |
40 | #define AES_INTR_MASK 0x07 | |
41 | ||
42 | #define AES_SOURCEA_REG 0x0010 | |
43 | #define AES_DSTA_REG 0x0014 | |
44 | #define AES_LENA_REG 0x0018 | |
45 | #define AES_WRITEKEY0_REG 0x0030 | |
46 | #define AES_WRITEIV0_REG 0x0040 | |
47 | ||
48 | /* A very large counter that is used to gracefully bail out of an | |
49 | * operation in case of trouble | |
50 | */ | |
51 | ||
52 | #define AES_OP_TIMEOUT 0x50000 | |
53 | ||
54 | /* Static structures */ | |
55 | ||
56 | static void __iomem * _iobase; | |
57 | static spinlock_t lock; | |
58 | ||
59 | /* Write a 128 bit field (either a writable key or IV) */ | |
60 | static inline void | |
61 | _writefield(u32 offset, void *value) | |
62 | { | |
63 | int i; | |
64 | for(i = 0; i < 4; i++) | |
65 | iowrite32(((u32 *) value)[i], _iobase + offset + (i * 4)); | |
66 | } | |
67 | ||
68 | /* Read a 128 bit field (either a writable key or IV) */ | |
69 | static inline void | |
70 | _readfield(u32 offset, void *value) | |
71 | { | |
72 | int i; | |
73 | for(i = 0; i < 4; i++) | |
74 | ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4)); | |
75 | } | |
76 | ||
77 | static int | |
78 | do_crypt(void *src, void *dst, int len, u32 flags) | |
79 | { | |
80 | u32 status; | |
81 | u32 counter = AES_OP_TIMEOUT; | |
82 | ||
83 | iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG); | |
84 | iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG); | |
85 | iowrite32(len, _iobase + AES_LENA_REG); | |
86 | ||
87 | /* Start the operation */ | |
88 | iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG); | |
89 | ||
90 | do | |
91 | status = ioread32(_iobase + AES_INTR_REG); | |
92 | while(!(status & AES_INTRA_PENDING) && --counter); | |
93 | ||
94 | /* Clear the event */ | |
95 | iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG); | |
96 | return counter ? 0 : 1; | |
97 | } | |
98 | ||
ab782705 | 99 | static unsigned int |
9fe757b0 JC |
100 | geode_aes_crypt(struct geode_aes_op *op) |
101 | { | |
9fe757b0 | 102 | u32 flags = 0; |
5efee174 | 103 | unsigned long iflags; |
9fe757b0 JC |
104 | |
105 | if (op->len == 0 || op->src == op->dst) | |
106 | return 0; | |
107 | ||
108 | if (op->flags & AES_FLAGS_COHERENT) | |
109 | flags |= (AES_CTRL_DCA | AES_CTRL_SCA); | |
110 | ||
111 | if (op->dir == AES_DIR_ENCRYPT) | |
112 | flags |= AES_CTRL_ENCRYPT; | |
113 | ||
114 | /* Start the critical section */ | |
115 | ||
116 | spin_lock_irqsave(&lock, iflags); | |
117 | ||
118 | if (op->mode == AES_MODE_CBC) { | |
119 | flags |= AES_CTRL_CBC; | |
120 | _writefield(AES_WRITEIV0_REG, op->iv); | |
121 | } | |
122 | ||
123 | if (op->flags & AES_FLAGS_USRKEY) { | |
124 | flags |= AES_CTRL_WRKEY; | |
125 | _writefield(AES_WRITEKEY0_REG, op->key); | |
126 | } | |
127 | ||
128 | do_crypt(op->src, op->dst, op->len, flags); | |
129 | ||
130 | if (op->mode == AES_MODE_CBC) | |
131 | _readfield(AES_WRITEIV0_REG, op->iv); | |
132 | ||
133 | spin_unlock_irqrestore(&lock, iflags); | |
134 | ||
135 | return op->len; | |
136 | } | |
137 | ||
138 | /* CRYPTO-API Functions */ | |
139 | ||
140 | static int | |
141 | geode_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len) | |
142 | { | |
143 | struct geode_aes_op *op = crypto_tfm_ctx(tfm); | |
144 | ||
145 | if (len != AES_KEY_LENGTH) { | |
146 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
150 | memcpy(op->key, key, len); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static void | |
155 | geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) | |
156 | { | |
157 | struct geode_aes_op *op = crypto_tfm_ctx(tfm); | |
158 | ||
159 | if ((out == NULL) || (in == NULL)) | |
160 | return; | |
161 | ||
162 | op->src = (void *) in; | |
163 | op->dst = (void *) out; | |
164 | op->mode = AES_MODE_ECB; | |
165 | op->flags = 0; | |
166 | op->len = AES_MIN_BLOCK_SIZE; | |
167 | op->dir = AES_DIR_ENCRYPT; | |
168 | ||
169 | geode_aes_crypt(op); | |
170 | } | |
171 | ||
172 | ||
173 | static void | |
174 | geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) | |
175 | { | |
176 | struct geode_aes_op *op = crypto_tfm_ctx(tfm); | |
177 | ||
178 | if ((out == NULL) || (in == NULL)) | |
179 | return; | |
180 | ||
181 | op->src = (void *) in; | |
182 | op->dst = (void *) out; | |
183 | op->mode = AES_MODE_ECB; | |
184 | op->flags = 0; | |
185 | op->len = AES_MIN_BLOCK_SIZE; | |
186 | op->dir = AES_DIR_DECRYPT; | |
187 | ||
188 | geode_aes_crypt(op); | |
189 | } | |
190 | ||
191 | ||
192 | static struct crypto_alg geode_alg = { | |
193 | .cra_name = "aes", | |
194 | .cra_driver_name = "geode-aes-128", | |
195 | .cra_priority = 300, | |
196 | .cra_alignmask = 15, | |
197 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, | |
198 | .cra_blocksize = AES_MIN_BLOCK_SIZE, | |
199 | .cra_ctxsize = sizeof(struct geode_aes_op), | |
200 | .cra_module = THIS_MODULE, | |
201 | .cra_list = LIST_HEAD_INIT(geode_alg.cra_list), | |
202 | .cra_u = { | |
203 | .cipher = { | |
204 | .cia_min_keysize = AES_KEY_LENGTH, | |
205 | .cia_max_keysize = AES_KEY_LENGTH, | |
206 | .cia_setkey = geode_setkey, | |
207 | .cia_encrypt = geode_encrypt, | |
208 | .cia_decrypt = geode_decrypt | |
209 | } | |
210 | } | |
211 | }; | |
212 | ||
213 | static int | |
214 | geode_cbc_decrypt(struct blkcipher_desc *desc, | |
215 | struct scatterlist *dst, struct scatterlist *src, | |
216 | unsigned int nbytes) | |
217 | { | |
218 | struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm); | |
219 | struct blkcipher_walk walk; | |
220 | int err, ret; | |
221 | ||
222 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
223 | err = blkcipher_walk_virt(desc, &walk); | |
224 | ||
225 | while((nbytes = walk.nbytes)) { | |
226 | op->src = walk.src.virt.addr, | |
227 | op->dst = walk.dst.virt.addr; | |
228 | op->mode = AES_MODE_CBC; | |
229 | op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE); | |
230 | op->dir = AES_DIR_DECRYPT; | |
231 | ||
232 | memcpy(op->iv, walk.iv, AES_IV_LENGTH); | |
233 | ||
234 | ret = geode_aes_crypt(op); | |
235 | ||
236 | memcpy(walk.iv, op->iv, AES_IV_LENGTH); | |
237 | nbytes -= ret; | |
238 | ||
239 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
240 | } | |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
245 | static int | |
246 | geode_cbc_encrypt(struct blkcipher_desc *desc, | |
247 | struct scatterlist *dst, struct scatterlist *src, | |
248 | unsigned int nbytes) | |
249 | { | |
250 | struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm); | |
251 | struct blkcipher_walk walk; | |
252 | int err, ret; | |
253 | ||
254 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
255 | err = blkcipher_walk_virt(desc, &walk); | |
256 | ||
257 | while((nbytes = walk.nbytes)) { | |
258 | op->src = walk.src.virt.addr, | |
259 | op->dst = walk.dst.virt.addr; | |
260 | op->mode = AES_MODE_CBC; | |
261 | op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE); | |
262 | op->dir = AES_DIR_ENCRYPT; | |
263 | ||
264 | memcpy(op->iv, walk.iv, AES_IV_LENGTH); | |
265 | ||
266 | ret = geode_aes_crypt(op); | |
267 | nbytes -= ret; | |
268 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
269 | } | |
270 | ||
271 | return err; | |
272 | } | |
273 | ||
274 | static struct crypto_alg geode_cbc_alg = { | |
275 | .cra_name = "cbc(aes)", | |
276 | .cra_driver_name = "cbc-aes-geode-128", | |
277 | .cra_priority = 400, | |
278 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
279 | .cra_blocksize = AES_MIN_BLOCK_SIZE, | |
280 | .cra_ctxsize = sizeof(struct geode_aes_op), | |
281 | .cra_alignmask = 15, | |
282 | .cra_type = &crypto_blkcipher_type, | |
283 | .cra_module = THIS_MODULE, | |
284 | .cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list), | |
285 | .cra_u = { | |
286 | .blkcipher = { | |
287 | .min_keysize = AES_KEY_LENGTH, | |
288 | .max_keysize = AES_KEY_LENGTH, | |
289 | .setkey = geode_setkey, | |
290 | .encrypt = geode_cbc_encrypt, | |
291 | .decrypt = geode_cbc_decrypt, | |
292 | } | |
293 | } | |
294 | }; | |
295 | ||
296 | static int | |
297 | geode_ecb_decrypt(struct blkcipher_desc *desc, | |
298 | struct scatterlist *dst, struct scatterlist *src, | |
299 | unsigned int nbytes) | |
300 | { | |
301 | struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm); | |
302 | struct blkcipher_walk walk; | |
303 | int err, ret; | |
304 | ||
305 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
306 | err = blkcipher_walk_virt(desc, &walk); | |
307 | ||
308 | while((nbytes = walk.nbytes)) { | |
309 | op->src = walk.src.virt.addr, | |
310 | op->dst = walk.dst.virt.addr; | |
311 | op->mode = AES_MODE_ECB; | |
312 | op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE); | |
313 | op->dir = AES_DIR_DECRYPT; | |
314 | ||
315 | ret = geode_aes_crypt(op); | |
316 | nbytes -= ret; | |
317 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
318 | } | |
319 | ||
320 | return err; | |
321 | } | |
322 | ||
323 | static int | |
324 | geode_ecb_encrypt(struct blkcipher_desc *desc, | |
325 | struct scatterlist *dst, struct scatterlist *src, | |
326 | unsigned int nbytes) | |
327 | { | |
328 | struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm); | |
329 | struct blkcipher_walk walk; | |
330 | int err, ret; | |
331 | ||
332 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
333 | err = blkcipher_walk_virt(desc, &walk); | |
334 | ||
335 | while((nbytes = walk.nbytes)) { | |
336 | op->src = walk.src.virt.addr, | |
337 | op->dst = walk.dst.virt.addr; | |
338 | op->mode = AES_MODE_ECB; | |
339 | op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE); | |
340 | op->dir = AES_DIR_ENCRYPT; | |
341 | ||
342 | ret = geode_aes_crypt(op); | |
343 | nbytes -= ret; | |
344 | ret = blkcipher_walk_done(desc, &walk, nbytes); | |
345 | } | |
346 | ||
347 | return err; | |
348 | } | |
349 | ||
350 | static struct crypto_alg geode_ecb_alg = { | |
351 | .cra_name = "ecb(aes)", | |
352 | .cra_driver_name = "ecb-aes-geode-128", | |
353 | .cra_priority = 400, | |
354 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
355 | .cra_blocksize = AES_MIN_BLOCK_SIZE, | |
356 | .cra_ctxsize = sizeof(struct geode_aes_op), | |
357 | .cra_alignmask = 15, | |
358 | .cra_type = &crypto_blkcipher_type, | |
359 | .cra_module = THIS_MODULE, | |
360 | .cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list), | |
361 | .cra_u = { | |
362 | .blkcipher = { | |
363 | .min_keysize = AES_KEY_LENGTH, | |
364 | .max_keysize = AES_KEY_LENGTH, | |
365 | .setkey = geode_setkey, | |
366 | .encrypt = geode_ecb_encrypt, | |
367 | .decrypt = geode_ecb_decrypt, | |
368 | } | |
369 | } | |
370 | }; | |
371 | ||
372 | static void | |
373 | geode_aes_remove(struct pci_dev *dev) | |
374 | { | |
375 | crypto_unregister_alg(&geode_alg); | |
376 | crypto_unregister_alg(&geode_ecb_alg); | |
377 | crypto_unregister_alg(&geode_cbc_alg); | |
378 | ||
379 | pci_iounmap(dev, _iobase); | |
380 | _iobase = NULL; | |
381 | ||
382 | pci_release_regions(dev); | |
383 | pci_disable_device(dev); | |
384 | } | |
385 | ||
386 | ||
387 | static int | |
388 | geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id) | |
389 | { | |
390 | int ret; | |
391 | ||
392 | if ((ret = pci_enable_device(dev))) | |
393 | return ret; | |
394 | ||
395 | if ((ret = pci_request_regions(dev, "geode-aes-128"))) | |
396 | goto eenable; | |
397 | ||
398 | _iobase = pci_iomap(dev, 0, 0); | |
399 | ||
400 | if (_iobase == NULL) { | |
401 | ret = -ENOMEM; | |
402 | goto erequest; | |
403 | } | |
404 | ||
405 | spin_lock_init(&lock); | |
406 | ||
407 | /* Clear any pending activity */ | |
408 | iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG); | |
409 | ||
410 | if ((ret = crypto_register_alg(&geode_alg))) | |
411 | goto eiomap; | |
412 | ||
413 | if ((ret = crypto_register_alg(&geode_ecb_alg))) | |
414 | goto ealg; | |
415 | ||
416 | if ((ret = crypto_register_alg(&geode_cbc_alg))) | |
417 | goto eecb; | |
418 | ||
419 | printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n"); | |
420 | return 0; | |
421 | ||
422 | eecb: | |
423 | crypto_unregister_alg(&geode_ecb_alg); | |
424 | ||
425 | ealg: | |
426 | crypto_unregister_alg(&geode_alg); | |
427 | ||
428 | eiomap: | |
429 | pci_iounmap(dev, _iobase); | |
430 | ||
431 | erequest: | |
432 | pci_release_regions(dev); | |
433 | ||
434 | eenable: | |
435 | pci_disable_device(dev); | |
436 | ||
437 | printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n"); | |
438 | return ret; | |
439 | } | |
440 | ||
441 | static struct pci_device_id geode_aes_tbl[] = { | |
442 | { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} , | |
443 | { 0, } | |
444 | }; | |
445 | ||
446 | MODULE_DEVICE_TABLE(pci, geode_aes_tbl); | |
447 | ||
448 | static struct pci_driver geode_aes_driver = { | |
449 | .name = "Geode LX AES", | |
450 | .id_table = geode_aes_tbl, | |
451 | .probe = geode_aes_probe, | |
452 | .remove = __devexit_p(geode_aes_remove) | |
453 | }; | |
454 | ||
455 | static int __init | |
456 | geode_aes_init(void) | |
457 | { | |
09cb914f | 458 | return pci_register_driver(&geode_aes_driver); |
9fe757b0 JC |
459 | } |
460 | ||
461 | static void __exit | |
462 | geode_aes_exit(void) | |
463 | { | |
464 | pci_unregister_driver(&geode_aes_driver); | |
465 | } | |
466 | ||
467 | MODULE_AUTHOR("Advanced Micro Devices, Inc."); | |
468 | MODULE_DESCRIPTION("Geode LX Hardware AES driver"); | |
469 | MODULE_LICENSE("GPL"); | |
470 | ||
471 | module_init(geode_aes_init); | |
472 | module_exit(geode_aes_exit); |