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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 /* 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_MIN_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_MIN_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 = tfm->__crt_alg->cra_name;
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_MIN_BLOCK_SIZE,
290 .cra_ctxsize = sizeof(struct geode_aes_op),
291 .cra_module = THIS_MODULE,
292 .cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
293 .cra_u = {
294 .cipher = {
295 .cia_min_keysize = AES_MIN_KEY_SIZE,
296 .cia_max_keysize = AES_MAX_KEY_SIZE,
297 .cia_setkey = geode_setkey_cip,
298 .cia_encrypt = geode_encrypt,
299 .cia_decrypt = geode_decrypt
300 }
301 }
302};
303
304static int
305geode_cbc_decrypt(struct blkcipher_desc *desc,
306 struct scatterlist *dst, struct scatterlist *src,
307 unsigned int nbytes)
308{
309 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
310 struct blkcipher_walk walk;
311 int err, ret;
312
313 if (unlikely(op->keylen != AES_KEYSIZE_128))
314 return fallback_blk_dec(desc, dst, src, nbytes);
315
316 blkcipher_walk_init(&walk, dst, src, nbytes);
317 err = blkcipher_walk_virt(desc, &walk);
318 op->iv = walk.iv;
319
320 while ((nbytes = walk.nbytes)) {
321 op->src = walk.src.virt.addr,
322 op->dst = walk.dst.virt.addr;
323 op->mode = AES_MODE_CBC;
324 op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
325 op->dir = AES_DIR_DECRYPT;
326
327 ret = geode_aes_crypt(op);
328
329 nbytes -= ret;
330 err = blkcipher_walk_done(desc, &walk, nbytes);
331 }
332
333 return err;
334}
335
336static int
337geode_cbc_encrypt(struct blkcipher_desc *desc,
338 struct scatterlist *dst, struct scatterlist *src,
339 unsigned int nbytes)
340{
341 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
342 struct blkcipher_walk walk;
343 int err, ret;
344
345 if (unlikely(op->keylen != AES_KEYSIZE_128))
346 return fallback_blk_enc(desc, dst, src, nbytes);
347
348 blkcipher_walk_init(&walk, dst, src, nbytes);
349 err = blkcipher_walk_virt(desc, &walk);
350 op->iv = walk.iv;
351
352 while ((nbytes = walk.nbytes)) {
353 op->src = walk.src.virt.addr,
354 op->dst = walk.dst.virt.addr;
355 op->mode = AES_MODE_CBC;
356 op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
357 op->dir = AES_DIR_ENCRYPT;
358
359 ret = geode_aes_crypt(op);
360 nbytes -= ret;
361 err = blkcipher_walk_done(desc, &walk, nbytes);
362 }
363
364 return err;
365}
366
367static int fallback_init_blk(struct crypto_tfm *tfm)
368{
369 const char *name = tfm->__crt_alg->cra_name;
370 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
371
372 op->fallback.blk = crypto_alloc_blkcipher(name, 0,
373 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
374
375 if (IS_ERR(op->fallback.blk)) {
376 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
377 return PTR_ERR(op->fallback.blk);
378 }
379
380 return 0;
381}
382
383static void fallback_exit_blk(struct crypto_tfm *tfm)
384{
385 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
386
387 crypto_free_blkcipher(op->fallback.blk);
388 op->fallback.blk = NULL;
389}
390
391static struct crypto_alg geode_cbc_alg = {
392 .cra_name = "cbc(aes)",
393 .cra_driver_name = "cbc-aes-geode",
394 .cra_priority = 400,
395 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
396 CRYPTO_ALG_KERN_DRIVER_ONLY |
397 CRYPTO_ALG_NEED_FALLBACK,
398 .cra_init = fallback_init_blk,
399 .cra_exit = fallback_exit_blk,
400 .cra_blocksize = AES_MIN_BLOCK_SIZE,
401 .cra_ctxsize = sizeof(struct geode_aes_op),
402 .cra_alignmask = 15,
403 .cra_type = &crypto_blkcipher_type,
404 .cra_module = THIS_MODULE,
405 .cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
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_IV_LENGTH,
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_MIN_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_MIN_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_MIN_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_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
493 .cra_u = {
494 .blkcipher = {
495 .min_keysize = AES_MIN_KEY_SIZE,
496 .max_keysize = AES_MAX_KEY_SIZE,
497 .setkey = geode_setkey_blk,
498 .encrypt = geode_ecb_encrypt,
499 .decrypt = geode_ecb_decrypt,
500 }
501 }
502};
503
504static void __devexit
505geode_aes_remove(struct pci_dev *dev)
506{
507 crypto_unregister_alg(&geode_alg);
508 crypto_unregister_alg(&geode_ecb_alg);
509 crypto_unregister_alg(&geode_cbc_alg);
510
511 pci_iounmap(dev, _iobase);
512 _iobase = NULL;
513
514 pci_release_regions(dev);
515 pci_disable_device(dev);
516}
517
518
519static int __devinit
520geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
521{
522 int ret;
523 ret = pci_enable_device(dev);
524 if (ret)
525 return ret;
526
527 ret = pci_request_regions(dev, "geode-aes");
528 if (ret)
529 goto eenable;
530
531 _iobase = pci_iomap(dev, 0, 0);
532
533 if (_iobase == NULL) {
534 ret = -ENOMEM;
535 goto erequest;
536 }
537
538 spin_lock_init(&lock);
539
540 /* Clear any pending activity */
541 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
542
543 ret = crypto_register_alg(&geode_alg);
544 if (ret)
545 goto eiomap;
546
547 ret = crypto_register_alg(&geode_ecb_alg);
548 if (ret)
549 goto ealg;
550
551 ret = crypto_register_alg(&geode_cbc_alg);
552 if (ret)
553 goto eecb;
554
555 printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
556 return 0;
557
558 eecb:
559 crypto_unregister_alg(&geode_ecb_alg);
560
561 ealg:
562 crypto_unregister_alg(&geode_alg);
563
564 eiomap:
565 pci_iounmap(dev, _iobase);
566
567 erequest:
568 pci_release_regions(dev);
569
570 eenable:
571 pci_disable_device(dev);
572
573 printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
574 return ret;
575}
576
577static struct pci_device_id geode_aes_tbl[] = {
578 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), } ,
579 { 0, }
580};
581
582MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
583
584static struct pci_driver geode_aes_driver = {
585 .name = "Geode LX AES",
586 .id_table = geode_aes_tbl,
587 .probe = geode_aes_probe,
588 .remove = __devexit_p(geode_aes_remove)
589};
590
591static int __init
592geode_aes_init(void)
593{
594 return pci_register_driver(&geode_aes_driver);
595}
596
597static void __exit
598geode_aes_exit(void)
599{
600 pci_unregister_driver(&geode_aes_driver);
601}
602
603MODULE_AUTHOR("Advanced Micro Devices, Inc.");
604MODULE_DESCRIPTION("Geode LX Hardware AES driver");
605MODULE_LICENSE("GPL");
606
607module_init(geode_aes_init);
608module_exit(geode_aes_exit);