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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#include <crypto/internal/cipher.h>
14#include <crypto/internal/skcipher.h>
15
16#include <linux/io.h>
17#include <linux/delay.h>
18
19#include "geode-aes.h"
20
21/* Static structures */
22
23static void __iomem *_iobase;
24static DEFINE_SPINLOCK(lock);
25
26/* Write a 128 bit field (either a writable key or IV) */
27static inline void
28_writefield(u32 offset, const void *value)
29{
30 int i;
31
32 for (i = 0; i < 4; i++)
33 iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));
34}
35
36/* Read a 128 bit field (either a writable key or IV) */
37static inline void
38_readfield(u32 offset, void *value)
39{
40 int i;
41
42 for (i = 0; i < 4; i++)
43 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
44}
45
46static int
47do_crypt(const void *src, void *dst, u32 len, u32 flags)
48{
49 u32 status;
50 u32 counter = AES_OP_TIMEOUT;
51
52 iowrite32(virt_to_phys((void *)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 void
70geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,
71 void *dst, u32 len, u8 *iv, int mode, int dir)
72{
73 u32 flags = 0;
74 unsigned long iflags;
75 int ret;
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 (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 (mode == AES_MODE_CBC) {
92 flags |= AES_CTRL_CBC;
93 _writefield(AES_WRITEIV0_REG, iv);
94 }
95
96 flags |= AES_CTRL_WRKEY;
97 _writefield(AES_WRITEKEY0_REG, tctx->key);
98
99 ret = do_crypt(src, dst, len, flags);
100 BUG_ON(ret);
101
102 if (mode == AES_MODE_CBC)
103 _readfield(AES_WRITEIV0_REG, iv);
104
105 spin_unlock_irqrestore(&lock, iflags);
106}
107
108/* CRYPTO-API Functions */
109
110static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
111 unsigned int len)
112{
113 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
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 /* not supported at all */
124 return -EINVAL;
125
126 /*
127 * The requested key size is not supported by HW, do a fallback
128 */
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);
132
133 return crypto_cipher_setkey(tctx->fallback.cip, key, len);
134}
135
136static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
137 unsigned int len)
138{
139 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
140
141 tctx->keylen = len;
142
143 if (len == AES_KEYSIZE_128) {
144 memcpy(tctx->key, key, len);
145 return 0;
146 }
147
148 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
149 /* not supported at all */
150 return -EINVAL;
151
152 /*
153 * The requested key size is not supported by HW, do a fallback
154 */
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);
160 return crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
161}
162
163static void
164geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
165{
166 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
167
168 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
169 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
170 return;
171 }
172
173 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
174 AES_MODE_ECB, AES_DIR_ENCRYPT);
175}
176
177
178static void
179geode_decrypt(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_decrypt_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_DECRYPT);
190}
191
192static int fallback_init_cip(struct crypto_tfm *tfm)
193{
194 const char *name = crypto_tfm_alg_name(tfm);
195 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
196
197 tctx->fallback.cip = crypto_alloc_cipher(name, 0,
198 CRYPTO_ALG_NEED_FALLBACK);
199
200 if (IS_ERR(tctx->fallback.cip)) {
201 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
202 return PTR_ERR(tctx->fallback.cip);
203 }
204
205 return 0;
206}
207
208static void fallback_exit_cip(struct crypto_tfm *tfm)
209{
210 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
211
212 crypto_free_cipher(tctx->fallback.cip);
213}
214
215static struct crypto_alg geode_alg = {
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,
224 .cra_blocksize = AES_BLOCK_SIZE,
225 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
226 .cra_module = THIS_MODULE,
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
234 }
235 }
236};
237
238static int geode_init_skcipher(struct crypto_skcipher *tfm)
239{
240 const char *name = crypto_tfm_alg_name(&tfm->base);
241 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
242
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);
249 }
250
251 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
252 crypto_skcipher_reqsize(tctx->fallback.skcipher));
253 return 0;
254}
255
256static void geode_exit_skcipher(struct crypto_skcipher *tfm)
257{
258 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
259
260 crypto_free_skcipher(tctx->fallback.skcipher);
261}
262
263static 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 }
281
282 err = skcipher_walk_virt(&walk, req, false);
283
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);
289 }
290
291 return err;
292}
293
294static int geode_cbc_encrypt(struct skcipher_request *req)
295{
296 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
297}
298
299static int geode_cbc_decrypt(struct skcipher_request *req)
300{
301 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
302}
303
304static int geode_ecb_encrypt(struct skcipher_request *req)
305{
306 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
307}
308
309static int geode_ecb_decrypt(struct skcipher_request *req)
310{
311 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
312}
313
314static 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 },
351};
352
353static void geode_aes_remove(struct pci_dev *dev)
354{
355 crypto_unregister_alg(&geode_alg);
356 crypto_unregister_skciphers(geode_skcipher_algs,
357 ARRAY_SIZE(geode_skcipher_algs));
358
359 pci_iounmap(dev, _iobase);
360 _iobase = NULL;
361
362 pci_release_regions(dev);
363 pci_disable_device(dev);
364}
365
366
367static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
368{
369 int ret;
370
371 ret = pci_enable_device(dev);
372 if (ret)
373 return ret;
374
375 ret = pci_request_regions(dev, "geode-aes");
376 if (ret)
377 goto eenable;
378
379 _iobase = pci_iomap(dev, 0, 0);
380
381 if (_iobase == NULL) {
382 ret = -ENOMEM;
383 goto erequest;
384 }
385
386 /* Clear any pending activity */
387 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
388
389 ret = crypto_register_alg(&geode_alg);
390 if (ret)
391 goto eiomap;
392
393 ret = crypto_register_skciphers(geode_skcipher_algs,
394 ARRAY_SIZE(geode_skcipher_algs));
395 if (ret)
396 goto ealg;
397
398 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
399 return 0;
400
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
413 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
414 return ret;
415}
416
417static struct pci_device_id geode_aes_tbl[] = {
418 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
419 { 0, }
420};
421
422MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
423
424static struct pci_driver geode_aes_driver = {
425 .name = "Geode LX AES",
426 .id_table = geode_aes_tbl,
427 .probe = geode_aes_probe,
428 .remove = geode_aes_remove,
429};
430
431module_pci_driver(geode_aes_driver);
432
433MODULE_AUTHOR("Advanced Micro Devices, Inc.");
434MODULE_DESCRIPTION("Geode LX Hardware AES driver");
435MODULE_LICENSE("GPL");
436MODULE_IMPORT_NS(CRYPTO_INTERNAL);
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_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_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 = crypto_tfm_alg_name(tfm);
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_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_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_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 = crypto_tfm_alg_name(tfm);
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_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_BLOCK_SIZE,
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_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_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_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 dev_notice(&dev->dev, "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 dev_err(&dev->dev, "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");