1 /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
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.
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>
19 #include <asm/delay.h>
21 #include "geode-aes.h"
23 /* Register definitions */
25 #define AES_CTRLA_REG 0x0000
27 #define AES_CTRL_START 0x01
28 #define AES_CTRL_DECRYPT 0x00
29 #define AES_CTRL_ENCRYPT 0x02
30 #define AES_CTRL_WRKEY 0x04
31 #define AES_CTRL_DCA 0x08
32 #define AES_CTRL_SCA 0x10
33 #define AES_CTRL_CBC 0x20
35 #define AES_INTR_REG 0x0008
37 #define AES_INTRA_PENDING (1 << 16)
38 #define AES_INTRB_PENDING (1 << 17)
40 #define AES_INTR_PENDING (AES_INTRA_PENDING | AES_INTRB_PENDING)
41 #define AES_INTR_MASK 0x07
43 #define AES_SOURCEA_REG 0x0010
44 #define AES_DSTA_REG 0x0014
45 #define AES_LENA_REG 0x0018
46 #define AES_WRITEKEY0_REG 0x0030
47 #define AES_WRITEIV0_REG 0x0040
49 /* A very large counter that is used to gracefully bail out of an
50 * operation in case of trouble
53 #define AES_OP_TIMEOUT 0x50000
55 /* Static structures */
57 static void __iomem * _iobase;
58 static spinlock_t lock;
60 /* Write a 128 bit field (either a writable key or IV) */
62 _writefield(u32 offset, void *value)
65 for(i = 0; i < 4; i++)
66 iowrite32(((u32 *) value)[i], _iobase + offset + (i * 4));
69 /* Read a 128 bit field (either a writable key or IV) */
71 _readfield(u32 offset, void *value)
74 for(i = 0; i < 4; i++)
75 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
79 do_crypt(void *src, void *dst, int len, u32 flags)
82 u32 counter = AES_OP_TIMEOUT;
84 iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
85 iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
86 iowrite32(len, _iobase + AES_LENA_REG);
88 /* Start the operation */
89 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
92 status = ioread32(_iobase + AES_INTR_REG);
93 while(!(status & AES_INTRA_PENDING) && --counter);
96 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
97 return counter ? 0 : 1;
101 geode_aes_crypt(struct geode_aes_op *op)
104 unsigned long iflags;
109 /* If the source and destination is the same, then
110 * we need to turn on the coherent flags, otherwise
111 * we don't need to worry
114 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
116 if (op->dir == AES_DIR_ENCRYPT)
117 flags |= AES_CTRL_ENCRYPT;
119 /* Start the critical section */
121 spin_lock_irqsave(&lock, iflags);
123 if (op->mode == AES_MODE_CBC) {
124 flags |= AES_CTRL_CBC;
125 _writefield(AES_WRITEIV0_REG, op->iv);
128 if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
129 flags |= AES_CTRL_WRKEY;
130 _writefield(AES_WRITEKEY0_REG, op->key);
133 do_crypt(op->src, op->dst, op->len, flags);
135 if (op->mode == AES_MODE_CBC)
136 _readfield(AES_WRITEIV0_REG, op->iv);
138 spin_unlock_irqrestore(&lock, iflags);
143 /* CRYPTO-API Functions */
146 geode_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len)
148 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
150 if (len != AES_KEY_LENGTH) {
151 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
155 memcpy(op->key, key, len);
160 geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
162 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
164 if ((out == NULL) || (in == NULL))
167 op->src = (void *) in;
168 op->dst = (void *) out;
169 op->mode = AES_MODE_ECB;
171 op->len = AES_MIN_BLOCK_SIZE;
172 op->dir = AES_DIR_ENCRYPT;
179 geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
181 struct geode_aes_op *op = crypto_tfm_ctx(tfm);
183 if ((out == NULL) || (in == NULL))
186 op->src = (void *) in;
187 op->dst = (void *) out;
188 op->mode = AES_MODE_ECB;
190 op->len = AES_MIN_BLOCK_SIZE;
191 op->dir = AES_DIR_DECRYPT;
197 static struct crypto_alg geode_alg = {
199 .cra_driver_name = "geode-aes-128",
202 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
203 .cra_blocksize = AES_MIN_BLOCK_SIZE,
204 .cra_ctxsize = sizeof(struct geode_aes_op),
205 .cra_module = THIS_MODULE,
206 .cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
209 .cia_min_keysize = AES_KEY_LENGTH,
210 .cia_max_keysize = AES_KEY_LENGTH,
211 .cia_setkey = geode_setkey,
212 .cia_encrypt = geode_encrypt,
213 .cia_decrypt = geode_decrypt
219 geode_cbc_decrypt(struct blkcipher_desc *desc,
220 struct scatterlist *dst, struct scatterlist *src,
223 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
224 struct blkcipher_walk walk;
227 blkcipher_walk_init(&walk, dst, src, nbytes);
228 err = blkcipher_walk_virt(desc, &walk);
229 memcpy(op->iv, walk.iv, AES_IV_LENGTH);
231 while((nbytes = walk.nbytes)) {
232 op->src = walk.src.virt.addr,
233 op->dst = walk.dst.virt.addr;
234 op->mode = AES_MODE_CBC;
235 op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
236 op->dir = AES_DIR_DECRYPT;
238 ret = geode_aes_crypt(op);
241 err = blkcipher_walk_done(desc, &walk, nbytes);
244 memcpy(walk.iv, op->iv, AES_IV_LENGTH);
249 geode_cbc_encrypt(struct blkcipher_desc *desc,
250 struct scatterlist *dst, struct scatterlist *src,
253 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
254 struct blkcipher_walk walk;
257 blkcipher_walk_init(&walk, dst, src, nbytes);
258 err = blkcipher_walk_virt(desc, &walk);
259 memcpy(op->iv, walk.iv, AES_IV_LENGTH);
261 while((nbytes = walk.nbytes)) {
262 op->src = walk.src.virt.addr,
263 op->dst = walk.dst.virt.addr;
264 op->mode = AES_MODE_CBC;
265 op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
266 op->dir = AES_DIR_ENCRYPT;
268 ret = geode_aes_crypt(op);
270 err = blkcipher_walk_done(desc, &walk, nbytes);
273 memcpy(walk.iv, op->iv, AES_IV_LENGTH);
277 static struct crypto_alg geode_cbc_alg = {
278 .cra_name = "cbc(aes)",
279 .cra_driver_name = "cbc-aes-geode-128",
281 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
282 .cra_blocksize = AES_MIN_BLOCK_SIZE,
283 .cra_ctxsize = sizeof(struct geode_aes_op),
285 .cra_type = &crypto_blkcipher_type,
286 .cra_module = THIS_MODULE,
287 .cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
290 .min_keysize = AES_KEY_LENGTH,
291 .max_keysize = AES_KEY_LENGTH,
292 .setkey = geode_setkey,
293 .encrypt = geode_cbc_encrypt,
294 .decrypt = geode_cbc_decrypt,
295 .ivsize = AES_IV_LENGTH,
301 geode_ecb_decrypt(struct blkcipher_desc *desc,
302 struct scatterlist *dst, struct scatterlist *src,
305 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
306 struct blkcipher_walk walk;
309 blkcipher_walk_init(&walk, dst, src, nbytes);
310 err = blkcipher_walk_virt(desc, &walk);
312 while((nbytes = walk.nbytes)) {
313 op->src = walk.src.virt.addr,
314 op->dst = walk.dst.virt.addr;
315 op->mode = AES_MODE_ECB;
316 op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
317 op->dir = AES_DIR_DECRYPT;
319 ret = geode_aes_crypt(op);
321 err = blkcipher_walk_done(desc, &walk, nbytes);
328 geode_ecb_encrypt(struct blkcipher_desc *desc,
329 struct scatterlist *dst, struct scatterlist *src,
332 struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
333 struct blkcipher_walk walk;
336 blkcipher_walk_init(&walk, dst, src, nbytes);
337 err = blkcipher_walk_virt(desc, &walk);
339 while((nbytes = walk.nbytes)) {
340 op->src = walk.src.virt.addr,
341 op->dst = walk.dst.virt.addr;
342 op->mode = AES_MODE_ECB;
343 op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
344 op->dir = AES_DIR_ENCRYPT;
346 ret = geode_aes_crypt(op);
348 ret = blkcipher_walk_done(desc, &walk, nbytes);
354 static struct crypto_alg geode_ecb_alg = {
355 .cra_name = "ecb(aes)",
356 .cra_driver_name = "ecb-aes-geode-128",
358 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
359 .cra_blocksize = AES_MIN_BLOCK_SIZE,
360 .cra_ctxsize = sizeof(struct geode_aes_op),
362 .cra_type = &crypto_blkcipher_type,
363 .cra_module = THIS_MODULE,
364 .cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
367 .min_keysize = AES_KEY_LENGTH,
368 .max_keysize = AES_KEY_LENGTH,
369 .setkey = geode_setkey,
370 .encrypt = geode_ecb_encrypt,
371 .decrypt = geode_ecb_decrypt,
377 geode_aes_remove(struct pci_dev *dev)
379 crypto_unregister_alg(&geode_alg);
380 crypto_unregister_alg(&geode_ecb_alg);
381 crypto_unregister_alg(&geode_cbc_alg);
383 pci_iounmap(dev, _iobase);
386 pci_release_regions(dev);
387 pci_disable_device(dev);
392 geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
396 if ((ret = pci_enable_device(dev)))
399 if ((ret = pci_request_regions(dev, "geode-aes-128")))
402 _iobase = pci_iomap(dev, 0, 0);
404 if (_iobase == NULL) {
409 spin_lock_init(&lock);
411 /* Clear any pending activity */
412 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
414 if ((ret = crypto_register_alg(&geode_alg)))
417 if ((ret = crypto_register_alg(&geode_ecb_alg)))
420 if ((ret = crypto_register_alg(&geode_cbc_alg)))
423 printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
427 crypto_unregister_alg(&geode_ecb_alg);
430 crypto_unregister_alg(&geode_alg);
433 pci_iounmap(dev, _iobase);
436 pci_release_regions(dev);
439 pci_disable_device(dev);
441 printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
445 static struct pci_device_id geode_aes_tbl[] = {
446 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
450 MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
452 static struct pci_driver geode_aes_driver = {
453 .name = "Geode LX AES",
454 .id_table = geode_aes_tbl,
455 .probe = geode_aes_probe,
456 .remove = __devexit_p(geode_aes_remove)
462 return pci_register_driver(&geode_aes_driver);
468 pci_unregister_driver(&geode_aes_driver);
471 MODULE_AUTHOR("Advanced Micro Devices, Inc.");
472 MODULE_DESCRIPTION("Geode LX Hardware AES driver");
473 MODULE_LICENSE("GPL");
475 module_init(geode_aes_init);
476 module_exit(geode_aes_exit);