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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/skcipher.h>
14
15#include <linux/io.h>
16#include <linux/delay.h>
17
18#include "geode-aes.h"
19
20/* Static structures */
21
22static void __iomem *_iobase;
23static spinlock_t lock;
24
25/* Write a 128 bit field (either a writable key or IV) */
26static inline void
27_writefield(u32 offset, const void *value)
28{
29 int i;
30
31 for (i = 0; i < 4; i++)
32 iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));
33}
34
35/* Read a 128 bit field (either a writable key or IV) */
36static inline void
37_readfield(u32 offset, void *value)
38{
39 int i;
40
41 for (i = 0; i < 4; i++)
42 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
43}
44
45static int
46do_crypt(const void *src, void *dst, u32 len, u32 flags)
47{
48 u32 status;
49 u32 counter = AES_OP_TIMEOUT;
50
51 iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG);
52 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
53 iowrite32(len, _iobase + AES_LENA_REG);
54
55 /* Start the operation */
56 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
57
58 do {
59 status = ioread32(_iobase + AES_INTR_REG);
60 cpu_relax();
61 } while (!(status & AES_INTRA_PENDING) && --counter);
62
63 /* Clear the event */
64 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
65 return counter ? 0 : 1;
66}
67
68static void
69geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,
70 void *dst, u32 len, u8 *iv, int mode, int dir)
71{
72 u32 flags = 0;
73 unsigned long iflags;
74 int ret;
75
76 /* If the source and destination is the same, then
77 * we need to turn on the coherent flags, otherwise
78 * we don't need to worry
79 */
80
81 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
82
83 if (dir == AES_DIR_ENCRYPT)
84 flags |= AES_CTRL_ENCRYPT;
85
86 /* Start the critical section */
87
88 spin_lock_irqsave(&lock, iflags);
89
90 if (mode == AES_MODE_CBC) {
91 flags |= AES_CTRL_CBC;
92 _writefield(AES_WRITEIV0_REG, iv);
93 }
94
95 flags |= AES_CTRL_WRKEY;
96 _writefield(AES_WRITEKEY0_REG, tctx->key);
97
98 ret = do_crypt(src, dst, len, flags);
99 BUG_ON(ret);
100
101 if (mode == AES_MODE_CBC)
102 _readfield(AES_WRITEIV0_REG, iv);
103
104 spin_unlock_irqrestore(&lock, iflags);
105}
106
107/* CRYPTO-API Functions */
108
109static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
110 unsigned int len)
111{
112 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
113
114 tctx->keylen = len;
115
116 if (len == AES_KEYSIZE_128) {
117 memcpy(tctx->key, key, len);
118 return 0;
119 }
120
121 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
122 /* not supported at all */
123 return -EINVAL;
124
125 /*
126 * The requested key size is not supported by HW, do a fallback
127 */
128 tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
129 tctx->fallback.cip->base.crt_flags |=
130 (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
131
132 return crypto_cipher_setkey(tctx->fallback.cip, key, len);
133}
134
135static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
136 unsigned int len)
137{
138 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
139
140 tctx->keylen = len;
141
142 if (len == AES_KEYSIZE_128) {
143 memcpy(tctx->key, key, len);
144 return 0;
145 }
146
147 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
148 /* not supported at all */
149 return -EINVAL;
150
151 /*
152 * The requested key size is not supported by HW, do a fallback
153 */
154 crypto_skcipher_clear_flags(tctx->fallback.skcipher,
155 CRYPTO_TFM_REQ_MASK);
156 crypto_skcipher_set_flags(tctx->fallback.skcipher,
157 crypto_skcipher_get_flags(tfm) &
158 CRYPTO_TFM_REQ_MASK);
159 return crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
160}
161
162static void
163geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
164{
165 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
166
167 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
168 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
169 return;
170 }
171
172 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
173 AES_MODE_ECB, AES_DIR_ENCRYPT);
174}
175
176
177static void
178geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
179{
180 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
181
182 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
183 crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
184 return;
185 }
186
187 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
188 AES_MODE_ECB, AES_DIR_DECRYPT);
189}
190
191static int fallback_init_cip(struct crypto_tfm *tfm)
192{
193 const char *name = crypto_tfm_alg_name(tfm);
194 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
195
196 tctx->fallback.cip = crypto_alloc_cipher(name, 0,
197 CRYPTO_ALG_NEED_FALLBACK);
198
199 if (IS_ERR(tctx->fallback.cip)) {
200 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
201 return PTR_ERR(tctx->fallback.cip);
202 }
203
204 return 0;
205}
206
207static void fallback_exit_cip(struct crypto_tfm *tfm)
208{
209 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
210
211 crypto_free_cipher(tctx->fallback.cip);
212}
213
214static struct crypto_alg geode_alg = {
215 .cra_name = "aes",
216 .cra_driver_name = "geode-aes",
217 .cra_priority = 300,
218 .cra_alignmask = 15,
219 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
220 CRYPTO_ALG_NEED_FALLBACK,
221 .cra_init = fallback_init_cip,
222 .cra_exit = fallback_exit_cip,
223 .cra_blocksize = AES_BLOCK_SIZE,
224 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
225 .cra_module = THIS_MODULE,
226 .cra_u = {
227 .cipher = {
228 .cia_min_keysize = AES_MIN_KEY_SIZE,
229 .cia_max_keysize = AES_MAX_KEY_SIZE,
230 .cia_setkey = geode_setkey_cip,
231 .cia_encrypt = geode_encrypt,
232 .cia_decrypt = geode_decrypt
233 }
234 }
235};
236
237static int geode_init_skcipher(struct crypto_skcipher *tfm)
238{
239 const char *name = crypto_tfm_alg_name(&tfm->base);
240 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
241
242 tctx->fallback.skcipher =
243 crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |
244 CRYPTO_ALG_ASYNC);
245 if (IS_ERR(tctx->fallback.skcipher)) {
246 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
247 return PTR_ERR(tctx->fallback.skcipher);
248 }
249
250 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
251 crypto_skcipher_reqsize(tctx->fallback.skcipher));
252 return 0;
253}
254
255static void geode_exit_skcipher(struct crypto_skcipher *tfm)
256{
257 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
258
259 crypto_free_skcipher(tctx->fallback.skcipher);
260}
261
262static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
263{
264 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
265 const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
266 struct skcipher_walk walk;
267 unsigned int nbytes;
268 int err;
269
270 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
271 struct skcipher_request *subreq = skcipher_request_ctx(req);
272
273 *subreq = *req;
274 skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
275 if (dir == AES_DIR_DECRYPT)
276 return crypto_skcipher_decrypt(subreq);
277 else
278 return crypto_skcipher_encrypt(subreq);
279 }
280
281 err = skcipher_walk_virt(&walk, req, false);
282
283 while ((nbytes = walk.nbytes) != 0) {
284 geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,
285 round_down(nbytes, AES_BLOCK_SIZE),
286 walk.iv, mode, dir);
287 err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
288 }
289
290 return err;
291}
292
293static int geode_cbc_encrypt(struct skcipher_request *req)
294{
295 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
296}
297
298static int geode_cbc_decrypt(struct skcipher_request *req)
299{
300 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
301}
302
303static int geode_ecb_encrypt(struct skcipher_request *req)
304{
305 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
306}
307
308static int geode_ecb_decrypt(struct skcipher_request *req)
309{
310 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
311}
312
313static struct skcipher_alg geode_skcipher_algs[] = {
314 {
315 .base.cra_name = "cbc(aes)",
316 .base.cra_driver_name = "cbc-aes-geode",
317 .base.cra_priority = 400,
318 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
319 CRYPTO_ALG_NEED_FALLBACK,
320 .base.cra_blocksize = AES_BLOCK_SIZE,
321 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
322 .base.cra_alignmask = 15,
323 .base.cra_module = THIS_MODULE,
324 .init = geode_init_skcipher,
325 .exit = geode_exit_skcipher,
326 .setkey = geode_setkey_skcipher,
327 .encrypt = geode_cbc_encrypt,
328 .decrypt = geode_cbc_decrypt,
329 .min_keysize = AES_MIN_KEY_SIZE,
330 .max_keysize = AES_MAX_KEY_SIZE,
331 .ivsize = AES_BLOCK_SIZE,
332 }, {
333 .base.cra_name = "ecb(aes)",
334 .base.cra_driver_name = "ecb-aes-geode",
335 .base.cra_priority = 400,
336 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
337 CRYPTO_ALG_NEED_FALLBACK,
338 .base.cra_blocksize = AES_BLOCK_SIZE,
339 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
340 .base.cra_alignmask = 15,
341 .base.cra_module = THIS_MODULE,
342 .init = geode_init_skcipher,
343 .exit = geode_exit_skcipher,
344 .setkey = geode_setkey_skcipher,
345 .encrypt = geode_ecb_encrypt,
346 .decrypt = geode_ecb_decrypt,
347 .min_keysize = AES_MIN_KEY_SIZE,
348 .max_keysize = AES_MAX_KEY_SIZE,
349 },
350};
351
352static void geode_aes_remove(struct pci_dev *dev)
353{
354 crypto_unregister_alg(&geode_alg);
355 crypto_unregister_skciphers(geode_skcipher_algs,
356 ARRAY_SIZE(geode_skcipher_algs));
357
358 pci_iounmap(dev, _iobase);
359 _iobase = NULL;
360
361 pci_release_regions(dev);
362 pci_disable_device(dev);
363}
364
365
366static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
367{
368 int ret;
369
370 ret = pci_enable_device(dev);
371 if (ret)
372 return ret;
373
374 ret = pci_request_regions(dev, "geode-aes");
375 if (ret)
376 goto eenable;
377
378 _iobase = pci_iomap(dev, 0, 0);
379
380 if (_iobase == NULL) {
381 ret = -ENOMEM;
382 goto erequest;
383 }
384
385 spin_lock_init(&lock);
386
387 /* Clear any pending activity */
388 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
389
390 ret = crypto_register_alg(&geode_alg);
391 if (ret)
392 goto eiomap;
393
394 ret = crypto_register_skciphers(geode_skcipher_algs,
395 ARRAY_SIZE(geode_skcipher_algs));
396 if (ret)
397 goto ealg;
398
399 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
400 return 0;
401
402 ealg:
403 crypto_unregister_alg(&geode_alg);
404
405 eiomap:
406 pci_iounmap(dev, _iobase);
407
408 erequest:
409 pci_release_regions(dev);
410
411 eenable:
412 pci_disable_device(dev);
413
414 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
415 return ret;
416}
417
418static struct pci_device_id geode_aes_tbl[] = {
419 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
420 { 0, }
421};
422
423MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
424
425static struct pci_driver geode_aes_driver = {
426 .name = "Geode LX AES",
427 .id_table = geode_aes_tbl,
428 .probe = geode_aes_probe,
429 .remove = geode_aes_remove,
430};
431
432module_pci_driver(geode_aes_driver);
433
434MODULE_AUTHOR("Advanced Micro Devices, Inc.");
435MODULE_DESCRIPTION("Geode LX Hardware AES driver");
436MODULE_LICENSE("GPL");
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
14#include <linux/io.h>
15#include <linux/delay.h>
16
17#include "geode-aes.h"
18
19/* Static structures */
20
21static void __iomem *_iobase;
22static spinlock_t lock;
23
24/* Write a 128 bit field (either a writable key or IV) */
25static inline void
26_writefield(u32 offset, void *value)
27{
28 int i;
29
30 for (i = 0; i < 4; i++)
31 iowrite32(((u32 *) value)[i], _iobase + offset + (i * 4));
32}
33
34/* Read a 128 bit field (either a writable key or IV) */
35static inline void
36_readfield(u32 offset, void *value)
37{
38 int i;
39
40 for (i = 0; i < 4; i++)
41 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
42}
43
44static int
45do_crypt(void *src, void *dst, int len, u32 flags)
46{
47 u32 status;
48 u32 counter = AES_OP_TIMEOUT;
49
50 iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
51 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
52 iowrite32(len, _iobase + AES_LENA_REG);
53
54 /* Start the operation */
55 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
56
57 do {
58 status = ioread32(_iobase + AES_INTR_REG);
59 cpu_relax();
60 } while (!(status & AES_INTRA_PENDING) && --counter);
61
62 /* Clear the event */
63 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
64 return counter ? 0 : 1;
65}
66
67static unsigned int
68geode_aes_crypt(struct geode_aes_op *op)
69{
70 u32 flags = 0;
71 unsigned long iflags;
72 int ret;
73
74 if (op->len == 0)
75 return 0;
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 (op->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 (op->mode == AES_MODE_CBC) {
92 flags |= AES_CTRL_CBC;
93 _writefield(AES_WRITEIV0_REG, op->iv);
94 }
95
96 if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
97 flags |= AES_CTRL_WRKEY;
98 _writefield(AES_WRITEKEY0_REG, op->key);
99 }
100
101 ret = do_crypt(op->src, op->dst, op->len, flags);
102 BUG_ON(ret);
103
104 if (op->mode == AES_MODE_CBC)
105 _readfield(AES_WRITEIV0_REG, op->iv);
106
107 spin_unlock_irqrestore(&lock, iflags);
108
109 return op->len;
110}
111
112/* CRYPTO-API Functions */
113
114static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
115 unsigned int len)
116{
117 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
118 unsigned int ret;
119
120 op->keylen = len;
121
122 if (len == AES_KEYSIZE_128) {
123 memcpy(op->key, key, len);
124 return 0;
125 }
126
127 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
128 /* not supported at all */
129 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
130 return -EINVAL;
131 }
132
133 /*
134 * The requested key size is not supported by HW, do a fallback
135 */
136 op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
137 op->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
138
139 ret = crypto_cipher_setkey(op->fallback.cip, key, len);
140 if (ret) {
141 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
142 tfm->crt_flags |= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
143 }
144 return ret;
145}
146
147static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
148 unsigned int len)
149{
150 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
151 unsigned int ret;
152
153 op->keylen = len;
154
155 if (len == AES_KEYSIZE_128) {
156 memcpy(op->key, key, len);
157 return 0;
158 }
159
160 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
161 /* not supported at all */
162 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
163 return -EINVAL;
164 }
165
166 /*
167 * The requested key size is not supported by HW, do a fallback
168 */
169 op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
170 op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
171
172 ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
173 if (ret) {
174 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
175 tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
176 }
177 return ret;
178}
179
180static int fallback_blk_dec(struct blkcipher_desc *desc,
181 struct scatterlist *dst, struct scatterlist *src,
182 unsigned int nbytes)
183{
184 unsigned int ret;
185 struct crypto_blkcipher *tfm;
186 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
187
188 tfm = desc->tfm;
189 desc->tfm = op->fallback.blk;
190
191 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
192
193 desc->tfm = tfm;
194 return ret;
195}
196static int fallback_blk_enc(struct blkcipher_desc *desc,
197 struct scatterlist *dst, struct scatterlist *src,
198 unsigned int nbytes)
199{
200 unsigned int ret;
201 struct crypto_blkcipher *tfm;
202 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
203
204 tfm = desc->tfm;
205 desc->tfm = op->fallback.blk;
206
207 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
208
209 desc->tfm = tfm;
210 return ret;
211}
212
213static void
214geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
215{
216 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
217
218 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
219 crypto_cipher_encrypt_one(op->fallback.cip, out, in);
220 return;
221 }
222
223 op->src = (void *) in;
224 op->dst = (void *) out;
225 op->mode = AES_MODE_ECB;
226 op->flags = 0;
227 op->len = AES_BLOCK_SIZE;
228 op->dir = AES_DIR_ENCRYPT;
229
230 geode_aes_crypt(op);
231}
232
233
234static void
235geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
236{
237 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
238
239 if (unlikely(op->keylen != AES_KEYSIZE_128)) {
240 crypto_cipher_decrypt_one(op->fallback.cip, out, in);
241 return;
242 }
243
244 op->src = (void *) in;
245 op->dst = (void *) out;
246 op->mode = AES_MODE_ECB;
247 op->flags = 0;
248 op->len = AES_BLOCK_SIZE;
249 op->dir = AES_DIR_DECRYPT;
250
251 geode_aes_crypt(op);
252}
253
254static int fallback_init_cip(struct crypto_tfm *tfm)
255{
256 const char *name = crypto_tfm_alg_name(tfm);
257 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
258
259 op->fallback.cip = crypto_alloc_cipher(name, 0,
260 CRYPTO_ALG_NEED_FALLBACK);
261
262 if (IS_ERR(op->fallback.cip)) {
263 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
264 return PTR_ERR(op->fallback.cip);
265 }
266
267 return 0;
268}
269
270static void fallback_exit_cip(struct crypto_tfm *tfm)
271{
272 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
273
274 crypto_free_cipher(op->fallback.cip);
275 op->fallback.cip = NULL;
276}
277
278static struct crypto_alg geode_alg = {
279 .cra_name = "aes",
280 .cra_driver_name = "geode-aes",
281 .cra_priority = 300,
282 .cra_alignmask = 15,
283 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
284 CRYPTO_ALG_NEED_FALLBACK,
285 .cra_init = fallback_init_cip,
286 .cra_exit = fallback_exit_cip,
287 .cra_blocksize = AES_BLOCK_SIZE,
288 .cra_ctxsize = sizeof(struct geode_aes_op),
289 .cra_module = THIS_MODULE,
290 .cra_u = {
291 .cipher = {
292 .cia_min_keysize = AES_MIN_KEY_SIZE,
293 .cia_max_keysize = AES_MAX_KEY_SIZE,
294 .cia_setkey = geode_setkey_cip,
295 .cia_encrypt = geode_encrypt,
296 .cia_decrypt = geode_decrypt
297 }
298 }
299};
300
301static int
302geode_cbc_decrypt(struct blkcipher_desc *desc,
303 struct scatterlist *dst, struct scatterlist *src,
304 unsigned int nbytes)
305{
306 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
307 struct blkcipher_walk walk;
308 int err, ret;
309
310 if (unlikely(op->keylen != AES_KEYSIZE_128))
311 return fallback_blk_dec(desc, dst, src, nbytes);
312
313 blkcipher_walk_init(&walk, dst, src, nbytes);
314 err = blkcipher_walk_virt(desc, &walk);
315 op->iv = walk.iv;
316
317 while ((nbytes = walk.nbytes)) {
318 op->src = walk.src.virt.addr,
319 op->dst = walk.dst.virt.addr;
320 op->mode = AES_MODE_CBC;
321 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
322 op->dir = AES_DIR_DECRYPT;
323
324 ret = geode_aes_crypt(op);
325
326 nbytes -= ret;
327 err = blkcipher_walk_done(desc, &walk, nbytes);
328 }
329
330 return err;
331}
332
333static int
334geode_cbc_encrypt(struct blkcipher_desc *desc,
335 struct scatterlist *dst, struct scatterlist *src,
336 unsigned int nbytes)
337{
338 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
339 struct blkcipher_walk walk;
340 int err, ret;
341
342 if (unlikely(op->keylen != AES_KEYSIZE_128))
343 return fallback_blk_enc(desc, dst, src, nbytes);
344
345 blkcipher_walk_init(&walk, dst, src, nbytes);
346 err = blkcipher_walk_virt(desc, &walk);
347 op->iv = walk.iv;
348
349 while ((nbytes = walk.nbytes)) {
350 op->src = walk.src.virt.addr,
351 op->dst = walk.dst.virt.addr;
352 op->mode = AES_MODE_CBC;
353 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
354 op->dir = AES_DIR_ENCRYPT;
355
356 ret = geode_aes_crypt(op);
357 nbytes -= ret;
358 err = blkcipher_walk_done(desc, &walk, nbytes);
359 }
360
361 return err;
362}
363
364static int fallback_init_blk(struct crypto_tfm *tfm)
365{
366 const char *name = crypto_tfm_alg_name(tfm);
367 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
368
369 op->fallback.blk = crypto_alloc_blkcipher(name, 0,
370 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
371
372 if (IS_ERR(op->fallback.blk)) {
373 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
374 return PTR_ERR(op->fallback.blk);
375 }
376
377 return 0;
378}
379
380static void fallback_exit_blk(struct crypto_tfm *tfm)
381{
382 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
383
384 crypto_free_blkcipher(op->fallback.blk);
385 op->fallback.blk = NULL;
386}
387
388static struct crypto_alg geode_cbc_alg = {
389 .cra_name = "cbc(aes)",
390 .cra_driver_name = "cbc-aes-geode",
391 .cra_priority = 400,
392 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
393 CRYPTO_ALG_KERN_DRIVER_ONLY |
394 CRYPTO_ALG_NEED_FALLBACK,
395 .cra_init = fallback_init_blk,
396 .cra_exit = fallback_exit_blk,
397 .cra_blocksize = AES_BLOCK_SIZE,
398 .cra_ctxsize = sizeof(struct geode_aes_op),
399 .cra_alignmask = 15,
400 .cra_type = &crypto_blkcipher_type,
401 .cra_module = THIS_MODULE,
402 .cra_u = {
403 .blkcipher = {
404 .min_keysize = AES_MIN_KEY_SIZE,
405 .max_keysize = AES_MAX_KEY_SIZE,
406 .setkey = geode_setkey_blk,
407 .encrypt = geode_cbc_encrypt,
408 .decrypt = geode_cbc_decrypt,
409 .ivsize = AES_BLOCK_SIZE,
410 }
411 }
412};
413
414static int
415geode_ecb_decrypt(struct blkcipher_desc *desc,
416 struct scatterlist *dst, struct scatterlist *src,
417 unsigned int nbytes)
418{
419 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
420 struct blkcipher_walk walk;
421 int err, ret;
422
423 if (unlikely(op->keylen != AES_KEYSIZE_128))
424 return fallback_blk_dec(desc, dst, src, nbytes);
425
426 blkcipher_walk_init(&walk, dst, src, nbytes);
427 err = blkcipher_walk_virt(desc, &walk);
428
429 while ((nbytes = walk.nbytes)) {
430 op->src = walk.src.virt.addr,
431 op->dst = walk.dst.virt.addr;
432 op->mode = AES_MODE_ECB;
433 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
434 op->dir = AES_DIR_DECRYPT;
435
436 ret = geode_aes_crypt(op);
437 nbytes -= ret;
438 err = blkcipher_walk_done(desc, &walk, nbytes);
439 }
440
441 return err;
442}
443
444static int
445geode_ecb_encrypt(struct blkcipher_desc *desc,
446 struct scatterlist *dst, struct scatterlist *src,
447 unsigned int nbytes)
448{
449 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
450 struct blkcipher_walk walk;
451 int err, ret;
452
453 if (unlikely(op->keylen != AES_KEYSIZE_128))
454 return fallback_blk_enc(desc, dst, src, nbytes);
455
456 blkcipher_walk_init(&walk, dst, src, nbytes);
457 err = blkcipher_walk_virt(desc, &walk);
458
459 while ((nbytes = walk.nbytes)) {
460 op->src = walk.src.virt.addr,
461 op->dst = walk.dst.virt.addr;
462 op->mode = AES_MODE_ECB;
463 op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
464 op->dir = AES_DIR_ENCRYPT;
465
466 ret = geode_aes_crypt(op);
467 nbytes -= ret;
468 ret = blkcipher_walk_done(desc, &walk, nbytes);
469 }
470
471 return err;
472}
473
474static struct crypto_alg geode_ecb_alg = {
475 .cra_name = "ecb(aes)",
476 .cra_driver_name = "ecb-aes-geode",
477 .cra_priority = 400,
478 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
479 CRYPTO_ALG_KERN_DRIVER_ONLY |
480 CRYPTO_ALG_NEED_FALLBACK,
481 .cra_init = fallback_init_blk,
482 .cra_exit = fallback_exit_blk,
483 .cra_blocksize = AES_BLOCK_SIZE,
484 .cra_ctxsize = sizeof(struct geode_aes_op),
485 .cra_alignmask = 15,
486 .cra_type = &crypto_blkcipher_type,
487 .cra_module = THIS_MODULE,
488 .cra_u = {
489 .blkcipher = {
490 .min_keysize = AES_MIN_KEY_SIZE,
491 .max_keysize = AES_MAX_KEY_SIZE,
492 .setkey = geode_setkey_blk,
493 .encrypt = geode_ecb_encrypt,
494 .decrypt = geode_ecb_decrypt,
495 }
496 }
497};
498
499static void geode_aes_remove(struct pci_dev *dev)
500{
501 crypto_unregister_alg(&geode_alg);
502 crypto_unregister_alg(&geode_ecb_alg);
503 crypto_unregister_alg(&geode_cbc_alg);
504
505 pci_iounmap(dev, _iobase);
506 _iobase = NULL;
507
508 pci_release_regions(dev);
509 pci_disable_device(dev);
510}
511
512
513static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
514{
515 int ret;
516
517 ret = pci_enable_device(dev);
518 if (ret)
519 return ret;
520
521 ret = pci_request_regions(dev, "geode-aes");
522 if (ret)
523 goto eenable;
524
525 _iobase = pci_iomap(dev, 0, 0);
526
527 if (_iobase == NULL) {
528 ret = -ENOMEM;
529 goto erequest;
530 }
531
532 spin_lock_init(&lock);
533
534 /* Clear any pending activity */
535 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
536
537 ret = crypto_register_alg(&geode_alg);
538 if (ret)
539 goto eiomap;
540
541 ret = crypto_register_alg(&geode_ecb_alg);
542 if (ret)
543 goto ealg;
544
545 ret = crypto_register_alg(&geode_cbc_alg);
546 if (ret)
547 goto eecb;
548
549 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
550 return 0;
551
552 eecb:
553 crypto_unregister_alg(&geode_ecb_alg);
554
555 ealg:
556 crypto_unregister_alg(&geode_alg);
557
558 eiomap:
559 pci_iounmap(dev, _iobase);
560
561 erequest:
562 pci_release_regions(dev);
563
564 eenable:
565 pci_disable_device(dev);
566
567 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
568 return ret;
569}
570
571static struct pci_device_id geode_aes_tbl[] = {
572 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
573 { 0, }
574};
575
576MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
577
578static struct pci_driver geode_aes_driver = {
579 .name = "Geode LX AES",
580 .id_table = geode_aes_tbl,
581 .probe = geode_aes_probe,
582 .remove = geode_aes_remove,
583};
584
585module_pci_driver(geode_aes_driver);
586
587MODULE_AUTHOR("Advanced Micro Devices, Inc.");
588MODULE_DESCRIPTION("Geode LX Hardware AES driver");
589MODULE_LICENSE("GPL");