?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.19.133
[linux/fpc-iii.git] / drivers / crypto / geode-aes.c
blob0bd99c0decf580422633dc260aef24c5c774d40a
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 #include <crypto/internal/skcipher.h>
18
19 #include <linux/io.h>
20 #include <linux/delay.h>
21
22 #include "geode-aes.h"
23
24 /* Static structures */
25
26 static void __iomem *_iobase;
27 static spinlock_t lock;
28
29 /* Write a 128 bit field (either a writable key or IV) */
30 static inline void
31 _writefield(u32 offset, const void *value)
32 {
33 int i;
34
35 for (i = 0; i < 4; i++)
36 iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));
37 }
38
39 /* Read a 128 bit field (either a writable key or IV) */
40 static inline void
41 _readfield(u32 offset, void *value)
42 {
43 int i;
44
45 for (i = 0; i < 4; i++)
46 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
47 }
48
49 static int
50 do_crypt(const void *src, void *dst, u32 len, u32 flags)
51 {
52 u32 status;
53 u32 counter = AES_OP_TIMEOUT;
54
55 iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG);
56 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
57 iowrite32(len, _iobase + AES_LENA_REG);
58
59 /* Start the operation */
60 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
61
62 do {
63 status = ioread32(_iobase + AES_INTR_REG);
64 cpu_relax();
65 } while (!(status & AES_INTRA_PENDING) && --counter);
66
67 /* Clear the event */
68 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
69 return counter ? 0 : 1;
70 }
71
72 static void
73 geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,
74 void *dst, u32 len, u8 *iv, int mode, int dir)
75 {
76 u32 flags = 0;
77 unsigned long iflags;
78 int ret;
79
80 /* If the source and destination is the same, then
81 * we need to turn on the coherent flags, otherwise
82 * we don't need to worry
83 */
84
85 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
86
87 if (dir == AES_DIR_ENCRYPT)
88 flags |= AES_CTRL_ENCRYPT;
89
90 /* Start the critical section */
91
92 spin_lock_irqsave(&lock, iflags);
93
94 if (mode == AES_MODE_CBC) {
95 flags |= AES_CTRL_CBC;
96 _writefield(AES_WRITEIV0_REG, iv);
97 }
98
99 flags |= AES_CTRL_WRKEY;
100 _writefield(AES_WRITEKEY0_REG, tctx->key);
101
102 ret = do_crypt(src, dst, len, flags);
103 BUG_ON(ret);
104
105 if (mode == AES_MODE_CBC)
106 _readfield(AES_WRITEIV0_REG, iv);
107
108 spin_unlock_irqrestore(&lock, iflags);
109 }
110
111 /* CRYPTO-API Functions */
112
113 static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
114 unsigned int len)
115 {
116 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
117 unsigned int ret;
118
119 tctx->keylen = len;
120
121 if (len == AES_KEYSIZE_128) {
122 memcpy(tctx->key, key, len);
123 return 0;
124 }
125
126 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
127 /* not supported at all */
128 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
129 return -EINVAL;
130 }
131
132 /*
133 * The requested key size is not supported by HW, do a fallback
134 */
135 tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
136 tctx->fallback.cip->base.crt_flags |=
137 (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
138
139 ret = crypto_cipher_setkey(tctx->fallback.cip, key, len);
140 if (ret) {
141 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
142 tfm->crt_flags |= (tctx->fallback.cip->base.crt_flags &
143 CRYPTO_TFM_RES_MASK);
144 }
145 return ret;
146 }
147
148 static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
149 unsigned int len)
150 {
151 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
152 unsigned int ret;
153
154 tctx->keylen = len;
155
156 if (len == AES_KEYSIZE_128) {
157 memcpy(tctx->key, key, len);
158 return 0;
159 }
160
161 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
162 /* not supported at all */
163 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
164 return -EINVAL;
165 }
166
167 /*
168 * The requested key size is not supported by HW, do a fallback
169 */
170 crypto_skcipher_clear_flags(tctx->fallback.skcipher,
171 CRYPTO_TFM_REQ_MASK);
172 crypto_skcipher_set_flags(tctx->fallback.skcipher,
173 crypto_skcipher_get_flags(tfm) &
174 CRYPTO_TFM_REQ_MASK);
175 ret = crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
176 crypto_skcipher_set_flags(tfm,
177 crypto_skcipher_get_flags(tctx->fallback.skcipher) &
178 CRYPTO_TFM_RES_MASK);
179 return ret;
180 }
181
182 static void
183 geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
184 {
185 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
186
187 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
188 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
189 return;
190 }
191
192 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
193 AES_MODE_ECB, AES_DIR_ENCRYPT);
194 }
195
196
197 static void
198 geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
199 {
200 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
201
202 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
203 crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
204 return;
205 }
206
207 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
208 AES_MODE_ECB, AES_DIR_DECRYPT);
209 }
210
211 static int fallback_init_cip(struct crypto_tfm *tfm)
212 {
213 const char *name = crypto_tfm_alg_name(tfm);
214 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
215
216 tctx->fallback.cip = crypto_alloc_cipher(name, 0,
217 CRYPTO_ALG_NEED_FALLBACK);
218
219 if (IS_ERR(tctx->fallback.cip)) {
220 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
221 return PTR_ERR(tctx->fallback.cip);
222 }
223
224 return 0;
225 }
226
227 static void fallback_exit_cip(struct crypto_tfm *tfm)
228 {
229 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
230
231 crypto_free_cipher(tctx->fallback.cip);
232 }
233
234 static struct crypto_alg geode_alg = {
235 .cra_name = "aes",
236 .cra_driver_name = "geode-aes",
237 .cra_priority = 300,
238 .cra_alignmask = 15,
239 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
240 CRYPTO_ALG_NEED_FALLBACK,
241 .cra_init = fallback_init_cip,
242 .cra_exit = fallback_exit_cip,
243 .cra_blocksize = AES_BLOCK_SIZE,
244 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
245 .cra_module = THIS_MODULE,
246 .cra_u = {
247 .cipher = {
248 .cia_min_keysize = AES_MIN_KEY_SIZE,
249 .cia_max_keysize = AES_MAX_KEY_SIZE,
250 .cia_setkey = geode_setkey_cip,
251 .cia_encrypt = geode_encrypt,
252 .cia_decrypt = geode_decrypt
253 }
254 }
255 };
256
257 static int geode_init_skcipher(struct crypto_skcipher *tfm)
258 {
259 const char *name = crypto_tfm_alg_name(&tfm->base);
260 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
261
262 tctx->fallback.skcipher =
263 crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |
264 CRYPTO_ALG_ASYNC);
265 if (IS_ERR(tctx->fallback.skcipher)) {
266 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
267 return PTR_ERR(tctx->fallback.skcipher);
268 }
269
270 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
271 crypto_skcipher_reqsize(tctx->fallback.skcipher));
272 return 0;
273 }
274
275 static void geode_exit_skcipher(struct crypto_skcipher *tfm)
276 {
277 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
278
279 crypto_free_skcipher(tctx->fallback.skcipher);
280 }
281
282 static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
283 {
284 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
285 const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
286 struct skcipher_walk walk;
287 unsigned int nbytes;
288 int err;
289
290 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
291 struct skcipher_request *subreq = skcipher_request_ctx(req);
292
293 *subreq = *req;
294 skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
295 if (dir == AES_DIR_DECRYPT)
296 return crypto_skcipher_decrypt(subreq);
297 else
298 return crypto_skcipher_encrypt(subreq);
299 }
300
301 err = skcipher_walk_virt(&walk, req, false);
302
303 while ((nbytes = walk.nbytes) != 0) {
304 geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,
305 round_down(nbytes, AES_BLOCK_SIZE),
306 walk.iv, mode, dir);
307 err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
308 }
309
310 return err;
311 }
312
313 static int geode_cbc_encrypt(struct skcipher_request *req)
314 {
315 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
316 }
317
318 static int geode_cbc_decrypt(struct skcipher_request *req)
319 {
320 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
321 }
322
323 static int geode_ecb_encrypt(struct skcipher_request *req)
324 {
325 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
326 }
327
328 static int geode_ecb_decrypt(struct skcipher_request *req)
329 {
330 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
331 }
332
333 static struct skcipher_alg geode_skcipher_algs[] = {
334 {
335 .base.cra_name = "cbc(aes)",
336 .base.cra_driver_name = "cbc-aes-geode",
337 .base.cra_priority = 400,
338 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
339 CRYPTO_ALG_NEED_FALLBACK,
340 .base.cra_blocksize = AES_BLOCK_SIZE,
341 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
342 .base.cra_alignmask = 15,
343 .base.cra_module = THIS_MODULE,
344 .init = geode_init_skcipher,
345 .exit = geode_exit_skcipher,
346 .setkey = geode_setkey_skcipher,
347 .encrypt = geode_cbc_encrypt,
348 .decrypt = geode_cbc_decrypt,
349 .min_keysize = AES_MIN_KEY_SIZE,
350 .max_keysize = AES_MAX_KEY_SIZE,
351 .ivsize = AES_BLOCK_SIZE,
352 }, {
353 .base.cra_name = "ecb(aes)",
354 .base.cra_driver_name = "ecb-aes-geode",
355 .base.cra_priority = 400,
356 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
357 CRYPTO_ALG_NEED_FALLBACK,
358 .base.cra_blocksize = AES_BLOCK_SIZE,
359 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
360 .base.cra_alignmask = 15,
361 .base.cra_module = THIS_MODULE,
362 .init = geode_init_skcipher,
363 .exit = geode_exit_skcipher,
364 .setkey = geode_setkey_skcipher,
365 .encrypt = geode_ecb_encrypt,
366 .decrypt = geode_ecb_decrypt,
367 .min_keysize = AES_MIN_KEY_SIZE,
368 .max_keysize = AES_MAX_KEY_SIZE,
369 },
370 };
371
372 static void geode_aes_remove(struct pci_dev *dev)
373 {
374 crypto_unregister_alg(&geode_alg);
375 crypto_unregister_skciphers(geode_skcipher_algs,
376 ARRAY_SIZE(geode_skcipher_algs));
377
378 pci_iounmap(dev, _iobase);
379 _iobase = NULL;
380
381 pci_release_regions(dev);
382 pci_disable_device(dev);
383 }
384
385
386 static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
387 {
388 int ret;
389
390 ret = pci_enable_device(dev);
391 if (ret)
392 return ret;
393
394 ret = pci_request_regions(dev, "geode-aes");
395 if (ret)
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 ret = crypto_register_alg(&geode_alg);
411 if (ret)
412 goto eiomap;
413
414 ret = crypto_register_skciphers(geode_skcipher_algs,
415 ARRAY_SIZE(geode_skcipher_algs));
416 if (ret)
417 goto ealg;
418
419 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
420 return 0;
421
422 ealg:
423 crypto_unregister_alg(&geode_alg);
424
425 eiomap:
426 pci_iounmap(dev, _iobase);
427
428 erequest:
429 pci_release_regions(dev);
430
431 eenable:
432 pci_disable_device(dev);
433
434 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
435 return ret;
436 }
437
438 static struct pci_device_id geode_aes_tbl[] = {
439 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
440 { 0, }
441 };
442
443 MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
444
445 static struct pci_driver geode_aes_driver = {
446 .name = "Geode LX AES",
447 .id_table = geode_aes_tbl,
448 .probe = geode_aes_probe,
449 .remove = geode_aes_remove,
450 };
451
452 module_pci_driver(geode_aes_driver);
453
454 MODULE_AUTHOR("Advanced Micro Devices, Inc.");
455 MODULE_DESCRIPTION("Geode LX Hardware AES driver");
456 MODULE_LICENSE("GPL");
Linux with added FPC-III support