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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
34 for (i = 0; i < 4; i++)
35 iowrite32(((u32 *) value)[i], _iobase + offset + (i * 4));
36}
37
38/* Read a 128 bit field (either a writable key or IV) */
39static inline void
40_readfield(u32 offset, void *value)
41{
42 int i;
43
44 for (i = 0; i < 4; i++)
45 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
46}
47
48static int
49do_crypt(void *src, void *dst, int len, u32 flags)
50{
51 u32 status;
52 u32 counter = AES_OP_TIMEOUT;
53
54 iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
55 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
56 iowrite32(len, _iobase + AES_LENA_REG);
57
58 /* Start the operation */
59 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
60
61 do {
62 status = ioread32(_iobase + AES_INTR_REG);
63 cpu_relax();
64 } while (!(status & AES_INTRA_PENDING) && --counter);
65
66 /* Clear the event */
67 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
68 return counter ? 0 : 1;
69}
70
71static unsigned int
72geode_aes_crypt(struct geode_aes_op *op)
73{
74 u32 flags = 0;
75 unsigned long iflags;
76 int ret;
77
78 if (op->len == 0)
79 return 0;
80
81 /* If the source and destination is the same, then
82 * we need to turn on the coherent flags, otherwise
83 * we don't need to worry
84 */
85
86 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
87
88 if (op->dir == AES_DIR_ENCRYPT)
89 flags |= AES_CTRL_ENCRYPT;
90
91 /* Start the critical section */
92
93 spin_lock_irqsave(&lock, iflags);
94
95 if (op->mode == AES_MODE_CBC) {
96 flags |= AES_CTRL_CBC;
97 _writefield(AES_WRITEIV0_REG, op->iv);
98 }
99
100 if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
101 flags |= AES_CTRL_WRKEY;
102 _writefield(AES_WRITEKEY0_REG, op->key);
103 }
104
105 ret = do_crypt(op->src, op->dst, op->len, flags);
106 BUG_ON(ret);
107
108 if (op->mode == AES_MODE_CBC)
109 _readfield(AES_WRITEIV0_REG, op->iv);
110
111 spin_unlock_irqrestore(&lock, iflags);
112
113 return op->len;
114}
115
116/* CRYPTO-API Functions */
117
118static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
119 unsigned int len)
120{
121 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
122 unsigned int ret;
123
124 op->keylen = len;
125
126 if (len == AES_KEYSIZE_128) {
127 memcpy(op->key, key, len);
128 return 0;
129 }
130
131 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
132 /* not supported at all */
133 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
134 return -EINVAL;
135 }
136
137 /*
138 * The requested key size is not supported by HW, do a fallback
139 */
140 op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
141 op->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
142
143 ret = crypto_cipher_setkey(op->fallback.cip, key, len);
144 if (ret) {
145 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
146 tfm->crt_flags |= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
147 }
148 return ret;
149}
150
151static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
152 unsigned int len)
153{
154 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
155 unsigned int ret;
156
157 op->keylen = len;
158
159 if (len == AES_KEYSIZE_128) {
160 memcpy(op->key, key, len);
161 return 0;
162 }
163
164 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
165 /* not supported at all */
166 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
167 return -EINVAL;
168 }
169
170 /*
171 * The requested key size is not supported by HW, do a fallback
172 */
173 op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
174 op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
175
176 ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
177 if (ret) {
178 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
179 tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
180 }
181 return ret;
182}
183
184static int fallback_blk_dec(struct blkcipher_desc *desc,
185 struct scatterlist *dst, struct scatterlist *src,
186 unsigned int nbytes)
187{
188 unsigned int ret;
189 struct crypto_blkcipher *tfm;
190 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
191
192 tfm = desc->tfm;
193 desc->tfm = op->fallback.blk;
194
195 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
196
197 desc->tfm = tfm;
198 return ret;
199}
200static int fallback_blk_enc(struct blkcipher_desc *desc,
201 struct scatterlist *dst, struct scatterlist *src,
202 unsigned int nbytes)
203{
204 unsigned int ret;
205 struct crypto_blkcipher *tfm;
206 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
207
208 tfm = desc->tfm;
209 desc->tfm = op->fallback.blk;
210
211 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
212
213 desc->tfm = tfm;
214 return ret;
215}
216
217static void
218geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
219{
220 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
221
222 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
223 crypto_cipher_encrypt_one(op->fallback.cip, out, in);
224 return;
225 }
226
227 op->src = (void *) in;
228 op->dst = (void *) out;
229 op->mode = AES_MODE_ECB;
230 op->flags = 0;
231 op->len = AES_BLOCK_SIZE;
232 op->dir = AES_DIR_ENCRYPT;
233
234 geode_aes_crypt(op);
235}
236
237
238static void
239geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
240{
241 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
242
243 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
244 crypto_cipher_decrypt_one(op->fallback.cip, out, in);
245 return;
246 }
247
248 op->src = (void *) in;
249 op->dst = (void *) out;
250 op->mode = AES_MODE_ECB;
251 op->flags = 0;
252 op->len = AES_BLOCK_SIZE;
253 op->dir = AES_DIR_DECRYPT;
254
255 geode_aes_crypt(op);
256}
257
258static int fallback_init_cip(struct crypto_tfm *tfm)
259{
260 const char *name = crypto_tfm_alg_name(tfm);
261 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
262
263 op->fallback.cip = crypto_alloc_cipher(name, 0,
264 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
265
266 if (IS_ERR(op->fallback.cip)) {
267 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
268 return PTR_ERR(op->fallback.cip);
269 }
270
271 return 0;
272}
273
274static void fallback_exit_cip(struct crypto_tfm *tfm)
275{
276 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
277
278 crypto_free_cipher(op->fallback.cip);
279 op->fallback.cip = NULL;
280}
281
282static struct crypto_alg geode_alg = {
283 .cra_name = "aes",
284 .cra_driver_name = "geode-aes",
285 .cra_priority = 300,
286 .cra_alignmask = 15,
287 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
288 CRYPTO_ALG_NEED_FALLBACK,
289 .cra_init = fallback_init_cip,
290 .cra_exit = fallback_exit_cip,
291 .cra_blocksize = AES_BLOCK_SIZE,
292 .cra_ctxsize = sizeof(struct geode_aes_op),
293 .cra_module = THIS_MODULE,
294 .cra_u = {
295 .cipher = {
296 .cia_min_keysize = AES_MIN_KEY_SIZE,
297 .cia_max_keysize = AES_MAX_KEY_SIZE,
298 .cia_setkey = geode_setkey_cip,
299 .cia_encrypt = geode_encrypt,
300 .cia_decrypt = geode_decrypt
301 }
302 }
303};
304
305static int
306geode_cbc_decrypt(struct blkcipher_desc *desc,
307 struct scatterlist *dst, struct scatterlist *src,
308 unsigned int nbytes)
309{
310 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
311 struct blkcipher_walk walk;
312 int err, ret;
313
314 if (unlikely(op->keylen != AES_KEYSIZE_128))
315 return fallback_blk_dec(desc, dst, src, nbytes);
316
317 blkcipher_walk_init(&walk, dst, src, nbytes);
318 err = blkcipher_walk_virt(desc, &walk);
319 op->iv = walk.iv;
320
321 while ((nbytes = walk.nbytes)) {
322 op->src = walk.src.virt.addr,
323 op->dst = walk.dst.virt.addr;
324 op->mode = AES_MODE_CBC;
325 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
326 op->dir = AES_DIR_DECRYPT;
327
328 ret = geode_aes_crypt(op);
329
330 nbytes -= ret;
331 err = blkcipher_walk_done(desc, &walk, nbytes);
332 }
333
334 return err;
335}
336
337static int
338geode_cbc_encrypt(struct blkcipher_desc *desc,
339 struct scatterlist *dst, struct scatterlist *src,
340 unsigned int nbytes)
341{
342 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
343 struct blkcipher_walk walk;
344 int err, ret;
345
346 if (unlikely(op->keylen != AES_KEYSIZE_128))
347 return fallback_blk_enc(desc, dst, src, nbytes);
348
349 blkcipher_walk_init(&walk, dst, src, nbytes);
350 err = blkcipher_walk_virt(desc, &walk);
351 op->iv = walk.iv;
352
353 while ((nbytes = walk.nbytes)) {
354 op->src = walk.src.virt.addr,
355 op->dst = walk.dst.virt.addr;
356 op->mode = AES_MODE_CBC;
357 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
358 op->dir = AES_DIR_ENCRYPT;
359
360 ret = geode_aes_crypt(op);
361 nbytes -= ret;
362 err = blkcipher_walk_done(desc, &walk, nbytes);
363 }
364
365 return err;
366}
367
368static int fallback_init_blk(struct crypto_tfm *tfm)
369{
370 const char *name = crypto_tfm_alg_name(tfm);
371 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
372
373 op->fallback.blk = crypto_alloc_blkcipher(name, 0,
374 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
375
376 if (IS_ERR(op->fallback.blk)) {
377 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
378 return PTR_ERR(op->fallback.blk);
379 }
380
381 return 0;
382}
383
384static void fallback_exit_blk(struct crypto_tfm *tfm)
385{
386 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
387
388 crypto_free_blkcipher(op->fallback.blk);
389 op->fallback.blk = NULL;
390}
391
392static struct crypto_alg geode_cbc_alg = {
393 .cra_name = "cbc(aes)",
394 .cra_driver_name = "cbc-aes-geode",
395 .cra_priority = 400,
396 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
397 CRYPTO_ALG_KERN_DRIVER_ONLY |
398 CRYPTO_ALG_NEED_FALLBACK,
399 .cra_init = fallback_init_blk,
400 .cra_exit = fallback_exit_blk,
401 .cra_blocksize = AES_BLOCK_SIZE,
402 .cra_ctxsize = sizeof(struct geode_aes_op),
403 .cra_alignmask = 15,
404 .cra_type = &crypto_blkcipher_type,
405 .cra_module = THIS_MODULE,
406 .cra_u = {
407 .blkcipher = {
408 .min_keysize = AES_MIN_KEY_SIZE,
409 .max_keysize = AES_MAX_KEY_SIZE,
410 .setkey = geode_setkey_blk,
411 .encrypt = geode_cbc_encrypt,
412 .decrypt = geode_cbc_decrypt,
413 .ivsize = AES_BLOCK_SIZE,
414 }
415 }
416};
417
418static int
419geode_ecb_decrypt(struct blkcipher_desc *desc,
420 struct scatterlist *dst, struct scatterlist *src,
421 unsigned int nbytes)
422{
423 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
424 struct blkcipher_walk walk;
425 int err, ret;
426
427 if (unlikely(op->keylen != AES_KEYSIZE_128))
428 return fallback_blk_dec(desc, dst, src, nbytes);
429
430 blkcipher_walk_init(&walk, dst, src, nbytes);
431 err = blkcipher_walk_virt(desc, &walk);
432
433 while ((nbytes = walk.nbytes)) {
434 op->src = walk.src.virt.addr,
435 op->dst = walk.dst.virt.addr;
436 op->mode = AES_MODE_ECB;
437 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
438 op->dir = AES_DIR_DECRYPT;
439
440 ret = geode_aes_crypt(op);
441 nbytes -= ret;
442 err = blkcipher_walk_done(desc, &walk, nbytes);
443 }
444
445 return err;
446}
447
448static int
449geode_ecb_encrypt(struct blkcipher_desc *desc,
450 struct scatterlist *dst, struct scatterlist *src,
451 unsigned int nbytes)
452{
453 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
454 struct blkcipher_walk walk;
455 int err, ret;
456
457 if (unlikely(op->keylen != AES_KEYSIZE_128))
458 return fallback_blk_enc(desc, dst, src, nbytes);
459
460 blkcipher_walk_init(&walk, dst, src, nbytes);
461 err = blkcipher_walk_virt(desc, &walk);
462
463 while ((nbytes = walk.nbytes)) {
464 op->src = walk.src.virt.addr,
465 op->dst = walk.dst.virt.addr;
466 op->mode = AES_MODE_ECB;
467 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
468 op->dir = AES_DIR_ENCRYPT;
469
470 ret = geode_aes_crypt(op);
471 nbytes -= ret;
472 ret = blkcipher_walk_done(desc, &walk, nbytes);
473 }
474
475 return err;
476}
477
478static struct crypto_alg geode_ecb_alg = {
479 .cra_name = "ecb(aes)",
480 .cra_driver_name = "ecb-aes-geode",
481 .cra_priority = 400,
482 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
483 CRYPTO_ALG_KERN_DRIVER_ONLY |
484 CRYPTO_ALG_NEED_FALLBACK,
485 .cra_init = fallback_init_blk,
486 .cra_exit = fallback_exit_blk,
487 .cra_blocksize = AES_BLOCK_SIZE,
488 .cra_ctxsize = sizeof(struct geode_aes_op),
489 .cra_alignmask = 15,
490 .cra_type = &crypto_blkcipher_type,
491 .cra_module = THIS_MODULE,
492 .cra_u = {
493 .blkcipher = {
494 .min_keysize = AES_MIN_KEY_SIZE,
495 .max_keysize = AES_MAX_KEY_SIZE,
496 .setkey = geode_setkey_blk,
497 .encrypt = geode_ecb_encrypt,
498 .decrypt = geode_ecb_decrypt,
499 }
500 }
501};
502
503static void geode_aes_remove(struct pci_dev *dev)
504{
505 crypto_unregister_alg(&geode_alg);
506 crypto_unregister_alg(&geode_ecb_alg);
507 crypto_unregister_alg(&geode_cbc_alg);
508
509 pci_iounmap(dev, _iobase);
510 _iobase = NULL;
511
512 pci_release_regions(dev);
513 pci_disable_device(dev);
514}
515
516
517static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
518{
519 int ret;
520
521 ret = pci_enable_device(dev);
522 if (ret)
523 return ret;
524
525 ret = pci_request_regions(dev, "geode-aes");
526 if (ret)
527 goto eenable;
528
529 _iobase = pci_iomap(dev, 0, 0);
530
531 if (_iobase == NULL) {
532 ret = -ENOMEM;
533 goto erequest;
534 }
535
536 spin_lock_init(&lock);
537
538 /* Clear any pending activity */
539 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
540
541 ret = crypto_register_alg(&geode_alg);
542 if (ret)
543 goto eiomap;
544
545 ret = crypto_register_alg(&geode_ecb_alg);
546 if (ret)
547 goto ealg;
548
549 ret = crypto_register_alg(&geode_cbc_alg);
550 if (ret)
551 goto eecb;
552
553 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
554 return 0;
555
556 eecb:
557 crypto_unregister_alg(&geode_ecb_alg);
558
559 ealg:
560 crypto_unregister_alg(&geode_alg);
561
562 eiomap:
563 pci_iounmap(dev, _iobase);
564
565 erequest:
566 pci_release_regions(dev);
567
568 eenable:
569 pci_disable_device(dev);
570
571 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
572 return ret;
573}
574
575static struct pci_device_id geode_aes_tbl[] = {
576 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
577 { 0, }
578};
579
580MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
581
582static struct pci_driver geode_aes_driver = {
583 .name = "Geode LX AES",
584 .id_table = geode_aes_tbl,
585 .probe = geode_aes_probe,
586 .remove = geode_aes_remove,
587};
588
589module_pci_driver(geode_aes_driver);
590
591MODULE_AUTHOR("Advanced Micro Devices, Inc.");
592MODULE_DESCRIPTION("Geode LX Hardware AES driver");
593MODULE_LICENSE("GPL");