Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9fe757b0 | 2 | /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc. |
24086e3d | 3 | */ |
9fe757b0 JC |
4 | |
5 | #include <linux/module.h> | |
6 | #include <linux/kernel.h> | |
9fe757b0 JC |
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> | |
89e12654 | 12 | #include <crypto/aes.h> |
0eb76ba2 | 13 | #include <crypto/internal/cipher.h> |
4549f7e5 | 14 | #include <crypto/internal/skcipher.h> |
9fe757b0 | 15 | |
99700716 CC |
16 | #include <linux/io.h> |
17 | #include <linux/delay.h> | |
9fe757b0 JC |
18 | |
19 | #include "geode-aes.h" | |
20 | ||
9fe757b0 JC |
21 | /* Static structures */ |
22 | ||
99700716 | 23 | static void __iomem *_iobase; |
25ee76a2 | 24 | static DEFINE_SPINLOCK(lock); |
9fe757b0 JC |
25 | |
26 | /* Write a 128 bit field (either a writable key or IV) */ | |
27 | static inline void | |
4549f7e5 | 28 | _writefield(u32 offset, const void *value) |
9fe757b0 JC |
29 | { |
30 | int i; | |
24086e3d | 31 | |
99700716 | 32 | for (i = 0; i < 4; i++) |
4549f7e5 | 33 | iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4)); |
9fe757b0 JC |
34 | } |
35 | ||
36 | /* Read a 128 bit field (either a writable key or IV) */ | |
37 | static inline void | |
38 | _readfield(u32 offset, void *value) | |
39 | { | |
40 | int i; | |
24086e3d | 41 | |
99700716 | 42 | for (i = 0; i < 4; i++) |
9fe757b0 JC |
43 | ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4)); |
44 | } | |
45 | ||
46 | static int | |
4549f7e5 | 47 | do_crypt(const void *src, void *dst, u32 len, u32 flags) |
9fe757b0 JC |
48 | { |
49 | u32 status; | |
50 | u32 counter = AES_OP_TIMEOUT; | |
51 | ||
4549f7e5 | 52 | iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG); |
9fe757b0 JC |
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 | ||
1f4e4773 | 59 | do { |
9fe757b0 | 60 | status = ioread32(_iobase + AES_INTR_REG); |
1f4e4773 | 61 | cpu_relax(); |
99700716 | 62 | } while (!(status & AES_INTRA_PENDING) && --counter); |
9fe757b0 JC |
63 | |
64 | /* Clear the event */ | |
65 | iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG); | |
66 | return counter ? 0 : 1; | |
67 | } | |
68 | ||
4549f7e5 EB |
69 | static void |
70 | geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src, | |
71 | void *dst, u32 len, u8 *iv, int mode, int dir) | |
9fe757b0 | 72 | { |
9fe757b0 | 73 | u32 flags = 0; |
5efee174 | 74 | unsigned long iflags; |
1f4e4773 | 75 | int ret; |
9fe757b0 | 76 | |
761e7846 JC |
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 | ||
2e21630d | 82 | flags |= (AES_CTRL_DCA | AES_CTRL_SCA); |
9fe757b0 | 83 | |
4549f7e5 | 84 | if (dir == AES_DIR_ENCRYPT) |
9fe757b0 JC |
85 | flags |= AES_CTRL_ENCRYPT; |
86 | ||
87 | /* Start the critical section */ | |
88 | ||
89 | spin_lock_irqsave(&lock, iflags); | |
90 | ||
4549f7e5 | 91 | if (mode == AES_MODE_CBC) { |
9fe757b0 | 92 | flags |= AES_CTRL_CBC; |
4549f7e5 | 93 | _writefield(AES_WRITEIV0_REG, iv); |
9fe757b0 JC |
94 | } |
95 | ||
4549f7e5 EB |
96 | flags |= AES_CTRL_WRKEY; |
97 | _writefield(AES_WRITEKEY0_REG, tctx->key); | |
9fe757b0 | 98 | |
4549f7e5 | 99 | ret = do_crypt(src, dst, len, flags); |
1f4e4773 | 100 | BUG_ON(ret); |
9fe757b0 | 101 | |
4549f7e5 EB |
102 | if (mode == AES_MODE_CBC) |
103 | _readfield(AES_WRITEIV0_REG, iv); | |
9fe757b0 JC |
104 | |
105 | spin_unlock_irqrestore(&lock, iflags); | |
9fe757b0 JC |
106 | } |
107 | ||
108 | /* CRYPTO-API Functions */ | |
109 | ||
cd7c3bfe SS |
110 | static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key, |
111 | unsigned int len) | |
9fe757b0 | 112 | { |
4549f7e5 | 113 | struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); |
cd7c3bfe | 114 | |
4549f7e5 | 115 | tctx->keylen = len; |
cd7c3bfe SS |
116 | |
117 | if (len == AES_KEYSIZE_128) { | |
4549f7e5 | 118 | memcpy(tctx->key, key, len); |
cd7c3bfe SS |
119 | return 0; |
120 | } | |
9fe757b0 | 121 | |
674f368a | 122 | if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) |
cd7c3bfe | 123 | /* not supported at all */ |
9fe757b0 | 124 | return -EINVAL; |
9fe757b0 | 125 | |
cd7c3bfe SS |
126 | /* |
127 | * The requested key size is not supported by HW, do a fallback | |
128 | */ | |
4549f7e5 EB |
129 | tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; |
130 | tctx->fallback.cip->base.crt_flags |= | |
131 | (tfm->crt_flags & CRYPTO_TFM_REQ_MASK); | |
cd7c3bfe | 132 | |
af5034e8 | 133 | return crypto_cipher_setkey(tctx->fallback.cip, key, len); |
cd7c3bfe SS |
134 | } |
135 | ||
4549f7e5 EB |
136 | static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, |
137 | unsigned int len) | |
cd7c3bfe | 138 | { |
4549f7e5 | 139 | struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); |
cd7c3bfe | 140 | |
4549f7e5 | 141 | tctx->keylen = len; |
cd7c3bfe SS |
142 | |
143 | if (len == AES_KEYSIZE_128) { | |
4549f7e5 | 144 | memcpy(tctx->key, key, len); |
cd7c3bfe SS |
145 | return 0; |
146 | } | |
147 | ||
674f368a | 148 | if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) |
cd7c3bfe | 149 | /* not supported at all */ |
cd7c3bfe | 150 | return -EINVAL; |
cd7c3bfe SS |
151 | |
152 | /* | |
153 | * The requested key size is not supported by HW, do a fallback | |
154 | */ | |
4549f7e5 EB |
155 | crypto_skcipher_clear_flags(tctx->fallback.skcipher, |
156 | CRYPTO_TFM_REQ_MASK); | |
157 | crypto_skcipher_set_flags(tctx->fallback.skcipher, | |
158 | crypto_skcipher_get_flags(tfm) & | |
159 | CRYPTO_TFM_REQ_MASK); | |
af5034e8 | 160 | return crypto_skcipher_setkey(tctx->fallback.skcipher, key, len); |
cd7c3bfe SS |
161 | } |
162 | ||
9fe757b0 JC |
163 | static void |
164 | geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) | |
165 | { | |
4549f7e5 | 166 | const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); |
9fe757b0 | 167 | |
4549f7e5 EB |
168 | if (unlikely(tctx->keylen != AES_KEYSIZE_128)) { |
169 | crypto_cipher_encrypt_one(tctx->fallback.cip, out, in); | |
9fe757b0 | 170 | return; |
cd7c3bfe | 171 | } |
9fe757b0 | 172 | |
4549f7e5 EB |
173 | geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL, |
174 | AES_MODE_ECB, AES_DIR_ENCRYPT); | |
9fe757b0 JC |
175 | } |
176 | ||
177 | ||
178 | static void | |
179 | geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) | |
180 | { | |
4549f7e5 | 181 | const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); |
9fe757b0 | 182 | |
4549f7e5 EB |
183 | if (unlikely(tctx->keylen != AES_KEYSIZE_128)) { |
184 | crypto_cipher_decrypt_one(tctx->fallback.cip, out, in); | |
9fe757b0 | 185 | return; |
cd7c3bfe | 186 | } |
9fe757b0 | 187 | |
4549f7e5 EB |
188 | geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL, |
189 | AES_MODE_ECB, AES_DIR_DECRYPT); | |
9fe757b0 JC |
190 | } |
191 | ||
cd7c3bfe SS |
192 | static int fallback_init_cip(struct crypto_tfm *tfm) |
193 | { | |
d207a38c | 194 | const char *name = crypto_tfm_alg_name(tfm); |
4549f7e5 | 195 | struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); |
cd7c3bfe | 196 | |
4549f7e5 EB |
197 | tctx->fallback.cip = crypto_alloc_cipher(name, 0, |
198 | CRYPTO_ALG_NEED_FALLBACK); | |
cd7c3bfe | 199 | |
4549f7e5 | 200 | if (IS_ERR(tctx->fallback.cip)) { |
cd7c3bfe | 201 | printk(KERN_ERR "Error allocating fallback algo %s\n", name); |
4549f7e5 | 202 | return PTR_ERR(tctx->fallback.cip); |
cd7c3bfe SS |
203 | } |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static void fallback_exit_cip(struct crypto_tfm *tfm) | |
209 | { | |
4549f7e5 | 210 | struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); |
cd7c3bfe | 211 | |
4549f7e5 | 212 | crypto_free_cipher(tctx->fallback.cip); |
cd7c3bfe | 213 | } |
9fe757b0 JC |
214 | |
215 | static struct crypto_alg geode_alg = { | |
cd7c3bfe SS |
216 | .cra_name = "aes", |
217 | .cra_driver_name = "geode-aes", | |
218 | .cra_priority = 300, | |
219 | .cra_alignmask = 15, | |
220 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER | | |
221 | CRYPTO_ALG_NEED_FALLBACK, | |
222 | .cra_init = fallback_init_cip, | |
223 | .cra_exit = fallback_exit_cip, | |
b9d865e3 | 224 | .cra_blocksize = AES_BLOCK_SIZE, |
4549f7e5 | 225 | .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx), |
cd7c3bfe | 226 | .cra_module = THIS_MODULE, |
cd7c3bfe SS |
227 | .cra_u = { |
228 | .cipher = { | |
229 | .cia_min_keysize = AES_MIN_KEY_SIZE, | |
230 | .cia_max_keysize = AES_MAX_KEY_SIZE, | |
231 | .cia_setkey = geode_setkey_cip, | |
232 | .cia_encrypt = geode_encrypt, | |
233 | .cia_decrypt = geode_decrypt | |
9fe757b0 JC |
234 | } |
235 | } | |
236 | }; | |
237 | ||
4549f7e5 | 238 | static int geode_init_skcipher(struct crypto_skcipher *tfm) |
9fe757b0 | 239 | { |
4549f7e5 EB |
240 | const char *name = crypto_tfm_alg_name(&tfm->base); |
241 | struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); | |
cd7c3bfe | 242 | |
4549f7e5 EB |
243 | tctx->fallback.skcipher = |
244 | crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK | | |
245 | CRYPTO_ALG_ASYNC); | |
246 | if (IS_ERR(tctx->fallback.skcipher)) { | |
247 | printk(KERN_ERR "Error allocating fallback algo %s\n", name); | |
248 | return PTR_ERR(tctx->fallback.skcipher); | |
9fe757b0 JC |
249 | } |
250 | ||
4549f7e5 EB |
251 | crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) + |
252 | crypto_skcipher_reqsize(tctx->fallback.skcipher)); | |
253 | return 0; | |
9fe757b0 JC |
254 | } |
255 | ||
4549f7e5 | 256 | static void geode_exit_skcipher(struct crypto_skcipher *tfm) |
9fe757b0 | 257 | { |
4549f7e5 | 258 | struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); |
9fe757b0 | 259 | |
4549f7e5 EB |
260 | crypto_free_skcipher(tctx->fallback.skcipher); |
261 | } | |
cd7c3bfe | 262 | |
4549f7e5 EB |
263 | static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir) |
264 | { | |
265 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
266 | const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); | |
267 | struct skcipher_walk walk; | |
268 | unsigned int nbytes; | |
269 | int err; | |
270 | ||
271 | if (unlikely(tctx->keylen != AES_KEYSIZE_128)) { | |
272 | struct skcipher_request *subreq = skcipher_request_ctx(req); | |
273 | ||
274 | *subreq = *req; | |
275 | skcipher_request_set_tfm(subreq, tctx->fallback.skcipher); | |
276 | if (dir == AES_DIR_DECRYPT) | |
277 | return crypto_skcipher_decrypt(subreq); | |
278 | else | |
279 | return crypto_skcipher_encrypt(subreq); | |
280 | } | |
9fe757b0 | 281 | |
4549f7e5 | 282 | err = skcipher_walk_virt(&walk, req, false); |
9fe757b0 | 283 | |
4549f7e5 EB |
284 | while ((nbytes = walk.nbytes) != 0) { |
285 | geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr, | |
286 | round_down(nbytes, AES_BLOCK_SIZE), | |
287 | walk.iv, mode, dir); | |
288 | err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE); | |
9fe757b0 JC |
289 | } |
290 | ||
291 | return err; | |
292 | } | |
293 | ||
4549f7e5 | 294 | static int geode_cbc_encrypt(struct skcipher_request *req) |
cd7c3bfe | 295 | { |
4549f7e5 | 296 | return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT); |
cd7c3bfe SS |
297 | } |
298 | ||
4549f7e5 | 299 | static int geode_cbc_decrypt(struct skcipher_request *req) |
cd7c3bfe | 300 | { |
4549f7e5 | 301 | return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT); |
cd7c3bfe SS |
302 | } |
303 | ||
4549f7e5 | 304 | static int geode_ecb_encrypt(struct skcipher_request *req) |
9fe757b0 | 305 | { |
4549f7e5 | 306 | return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT); |
9fe757b0 JC |
307 | } |
308 | ||
4549f7e5 | 309 | static int geode_ecb_decrypt(struct skcipher_request *req) |
9fe757b0 | 310 | { |
4549f7e5 | 311 | return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT); |
9fe757b0 JC |
312 | } |
313 | ||
4549f7e5 EB |
314 | static struct skcipher_alg geode_skcipher_algs[] = { |
315 | { | |
316 | .base.cra_name = "cbc(aes)", | |
317 | .base.cra_driver_name = "cbc-aes-geode", | |
318 | .base.cra_priority = 400, | |
319 | .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | | |
320 | CRYPTO_ALG_NEED_FALLBACK, | |
321 | .base.cra_blocksize = AES_BLOCK_SIZE, | |
322 | .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx), | |
323 | .base.cra_alignmask = 15, | |
324 | .base.cra_module = THIS_MODULE, | |
325 | .init = geode_init_skcipher, | |
326 | .exit = geode_exit_skcipher, | |
327 | .setkey = geode_setkey_skcipher, | |
328 | .encrypt = geode_cbc_encrypt, | |
329 | .decrypt = geode_cbc_decrypt, | |
330 | .min_keysize = AES_MIN_KEY_SIZE, | |
331 | .max_keysize = AES_MAX_KEY_SIZE, | |
332 | .ivsize = AES_BLOCK_SIZE, | |
333 | }, { | |
334 | .base.cra_name = "ecb(aes)", | |
335 | .base.cra_driver_name = "ecb-aes-geode", | |
336 | .base.cra_priority = 400, | |
337 | .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | | |
338 | CRYPTO_ALG_NEED_FALLBACK, | |
339 | .base.cra_blocksize = AES_BLOCK_SIZE, | |
340 | .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx), | |
341 | .base.cra_alignmask = 15, | |
342 | .base.cra_module = THIS_MODULE, | |
343 | .init = geode_init_skcipher, | |
344 | .exit = geode_exit_skcipher, | |
345 | .setkey = geode_setkey_skcipher, | |
346 | .encrypt = geode_ecb_encrypt, | |
347 | .decrypt = geode_ecb_decrypt, | |
348 | .min_keysize = AES_MIN_KEY_SIZE, | |
349 | .max_keysize = AES_MAX_KEY_SIZE, | |
350 | }, | |
9fe757b0 JC |
351 | }; |
352 | ||
49cfe4db | 353 | static void geode_aes_remove(struct pci_dev *dev) |
9fe757b0 JC |
354 | { |
355 | crypto_unregister_alg(&geode_alg); | |
4549f7e5 EB |
356 | crypto_unregister_skciphers(geode_skcipher_algs, |
357 | ARRAY_SIZE(geode_skcipher_algs)); | |
9fe757b0 JC |
358 | |
359 | pci_iounmap(dev, _iobase); | |
360 | _iobase = NULL; | |
361 | ||
362 | pci_release_regions(dev); | |
363 | pci_disable_device(dev); | |
364 | } | |
365 | ||
366 | ||
49cfe4db | 367 | static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id) |
9fe757b0 JC |
368 | { |
369 | int ret; | |
24086e3d | 370 | |
99700716 CC |
371 | ret = pci_enable_device(dev); |
372 | if (ret) | |
9fe757b0 JC |
373 | return ret; |
374 | ||
99700716 CC |
375 | ret = pci_request_regions(dev, "geode-aes"); |
376 | if (ret) | |
9fe757b0 JC |
377 | goto eenable; |
378 | ||
379 | _iobase = pci_iomap(dev, 0, 0); | |
380 | ||
381 | if (_iobase == NULL) { | |
382 | ret = -ENOMEM; | |
383 | goto erequest; | |
384 | } | |
385 | ||
9fe757b0 JC |
386 | /* Clear any pending activity */ |
387 | iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG); | |
388 | ||
99700716 CC |
389 | ret = crypto_register_alg(&geode_alg); |
390 | if (ret) | |
9fe757b0 JC |
391 | goto eiomap; |
392 | ||
4549f7e5 EB |
393 | ret = crypto_register_skciphers(geode_skcipher_algs, |
394 | ARRAY_SIZE(geode_skcipher_algs)); | |
99700716 | 395 | if (ret) |
9fe757b0 JC |
396 | goto ealg; |
397 | ||
701bcbc1 | 398 | dev_notice(&dev->dev, "GEODE AES engine enabled.\n"); |
9fe757b0 JC |
399 | return 0; |
400 | ||
9fe757b0 JC |
401 | ealg: |
402 | crypto_unregister_alg(&geode_alg); | |
403 | ||
404 | eiomap: | |
405 | pci_iounmap(dev, _iobase); | |
406 | ||
407 | erequest: | |
408 | pci_release_regions(dev); | |
409 | ||
410 | eenable: | |
411 | pci_disable_device(dev); | |
412 | ||
701bcbc1 | 413 | dev_err(&dev->dev, "GEODE AES initialization failed.\n"); |
9fe757b0 JC |
414 | return ret; |
415 | } | |
416 | ||
417 | static struct pci_device_id geode_aes_tbl[] = { | |
24086e3d | 418 | { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), }, |
9fe757b0 JC |
419 | { 0, } |
420 | }; | |
421 | ||
422 | MODULE_DEVICE_TABLE(pci, geode_aes_tbl); | |
423 | ||
424 | static struct pci_driver geode_aes_driver = { | |
425 | .name = "Geode LX AES", | |
426 | .id_table = geode_aes_tbl, | |
427 | .probe = geode_aes_probe, | |
49cfe4db | 428 | .remove = geode_aes_remove, |
9fe757b0 JC |
429 | }; |
430 | ||
49d30d3d | 431 | module_pci_driver(geode_aes_driver); |
9fe757b0 JC |
432 | |
433 | MODULE_AUTHOR("Advanced Micro Devices, Inc."); | |
434 | MODULE_DESCRIPTION("Geode LX Hardware AES driver"); | |
435 | MODULE_LICENSE("GPL"); | |
0eb76ba2 | 436 | MODULE_IMPORT_NS(CRYPTO_INTERNAL); |