1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
5 #include <linux/module.h>
6 #include <linux/kernel.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>
16 #include <linux/delay.h>
18 #include "geode-aes.h"
20 /* Static structures */
22 static void __iomem *_iobase;
23 static spinlock_t lock;
25 /* Write a 128 bit field (either a writable key or IV) */
27 _writefield(u32 offset, const void *value)
31 for (i = 0; i < 4; i++)
32 iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));
35 /* Read a 128 bit field (either a writable key or IV) */
37 _readfield(u32 offset, void *value)
41 for (i = 0; i < 4; i++)
42 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
46 do_crypt(const void *src, void *dst, u32 len, u32 flags)
49 u32 counter = AES_OP_TIMEOUT;
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);
55 /* Start the operation */
56 iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
59 status = ioread32(_iobase + AES_INTR_REG);
61 } while (!(status & AES_INTRA_PENDING) && --counter);
64 iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
65 return counter ? 0 : 1;
69 geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,
70 void *dst, u32 len, u8 *iv, int mode, int dir)
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
81 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
83 if (dir == AES_DIR_ENCRYPT)
84 flags |= AES_CTRL_ENCRYPT;
86 /* Start the critical section */
88 spin_lock_irqsave(&lock, iflags);
90 if (mode == AES_MODE_CBC) {
91 flags |= AES_CTRL_CBC;
92 _writefield(AES_WRITEIV0_REG, iv);
95 flags |= AES_CTRL_WRKEY;
96 _writefield(AES_WRITEKEY0_REG, tctx->key);
98 ret = do_crypt(src, dst, len, flags);
101 if (mode == AES_MODE_CBC)
102 _readfield(AES_WRITEIV0_REG, iv);
104 spin_unlock_irqrestore(&lock, iflags);
107 /* CRYPTO-API Functions */
109 static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
112 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
117 if (len == AES_KEYSIZE_128) {
118 memcpy(tctx->key, key, len);
122 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
123 /* not supported at all */
124 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
129 * The requested key size is not supported by HW, do a fallback
131 tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
132 tctx->fallback.cip->base.crt_flags |=
133 (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
135 ret = crypto_cipher_setkey(tctx->fallback.cip, key, len);
137 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
138 tfm->crt_flags |= (tctx->fallback.cip->base.crt_flags &
139 CRYPTO_TFM_RES_MASK);
144 static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
147 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
152 if (len == AES_KEYSIZE_128) {
153 memcpy(tctx->key, key, len);
157 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
158 /* not supported at all */
159 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
164 * The requested key size is not supported by HW, do a fallback
166 crypto_skcipher_clear_flags(tctx->fallback.skcipher,
167 CRYPTO_TFM_REQ_MASK);
168 crypto_skcipher_set_flags(tctx->fallback.skcipher,
169 crypto_skcipher_get_flags(tfm) &
170 CRYPTO_TFM_REQ_MASK);
171 ret = crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
172 crypto_skcipher_set_flags(tfm,
173 crypto_skcipher_get_flags(tctx->fallback.skcipher) &
174 CRYPTO_TFM_RES_MASK);
179 geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
181 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
183 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
184 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
188 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
189 AES_MODE_ECB, AES_DIR_ENCRYPT);
194 geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
196 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
198 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
199 crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
203 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
204 AES_MODE_ECB, AES_DIR_DECRYPT);
207 static int fallback_init_cip(struct crypto_tfm *tfm)
209 const char *name = crypto_tfm_alg_name(tfm);
210 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
212 tctx->fallback.cip = crypto_alloc_cipher(name, 0,
213 CRYPTO_ALG_NEED_FALLBACK);
215 if (IS_ERR(tctx->fallback.cip)) {
216 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
217 return PTR_ERR(tctx->fallback.cip);
223 static void fallback_exit_cip(struct crypto_tfm *tfm)
225 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
227 crypto_free_cipher(tctx->fallback.cip);
230 static struct crypto_alg geode_alg = {
232 .cra_driver_name = "geode-aes",
235 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
236 CRYPTO_ALG_NEED_FALLBACK,
237 .cra_init = fallback_init_cip,
238 .cra_exit = fallback_exit_cip,
239 .cra_blocksize = AES_BLOCK_SIZE,
240 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
241 .cra_module = THIS_MODULE,
244 .cia_min_keysize = AES_MIN_KEY_SIZE,
245 .cia_max_keysize = AES_MAX_KEY_SIZE,
246 .cia_setkey = geode_setkey_cip,
247 .cia_encrypt = geode_encrypt,
248 .cia_decrypt = geode_decrypt
253 static int geode_init_skcipher(struct crypto_skcipher *tfm)
255 const char *name = crypto_tfm_alg_name(&tfm->base);
256 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
258 tctx->fallback.skcipher =
259 crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |
261 if (IS_ERR(tctx->fallback.skcipher)) {
262 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
263 return PTR_ERR(tctx->fallback.skcipher);
266 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
267 crypto_skcipher_reqsize(tctx->fallback.skcipher));
271 static void geode_exit_skcipher(struct crypto_skcipher *tfm)
273 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
275 crypto_free_skcipher(tctx->fallback.skcipher);
278 static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
280 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
281 const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
282 struct skcipher_walk walk;
286 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
287 struct skcipher_request *subreq = skcipher_request_ctx(req);
290 skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
291 if (dir == AES_DIR_DECRYPT)
292 return crypto_skcipher_decrypt(subreq);
294 return crypto_skcipher_encrypt(subreq);
297 err = skcipher_walk_virt(&walk, req, false);
299 while ((nbytes = walk.nbytes) != 0) {
300 geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,
301 round_down(nbytes, AES_BLOCK_SIZE),
303 err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
309 static int geode_cbc_encrypt(struct skcipher_request *req)
311 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
314 static int geode_cbc_decrypt(struct skcipher_request *req)
316 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
319 static int geode_ecb_encrypt(struct skcipher_request *req)
321 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
324 static int geode_ecb_decrypt(struct skcipher_request *req)
326 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
329 static struct skcipher_alg geode_skcipher_algs[] = {
331 .base.cra_name = "cbc(aes)",
332 .base.cra_driver_name = "cbc-aes-geode",
333 .base.cra_priority = 400,
334 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
335 CRYPTO_ALG_NEED_FALLBACK,
336 .base.cra_blocksize = AES_BLOCK_SIZE,
337 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
338 .base.cra_alignmask = 15,
339 .base.cra_module = THIS_MODULE,
340 .init = geode_init_skcipher,
341 .exit = geode_exit_skcipher,
342 .setkey = geode_setkey_skcipher,
343 .encrypt = geode_cbc_encrypt,
344 .decrypt = geode_cbc_decrypt,
345 .min_keysize = AES_MIN_KEY_SIZE,
346 .max_keysize = AES_MAX_KEY_SIZE,
347 .ivsize = AES_BLOCK_SIZE,
349 .base.cra_name = "ecb(aes)",
350 .base.cra_driver_name = "ecb-aes-geode",
351 .base.cra_priority = 400,
352 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
353 CRYPTO_ALG_NEED_FALLBACK,
354 .base.cra_blocksize = AES_BLOCK_SIZE,
355 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
356 .base.cra_alignmask = 15,
357 .base.cra_module = THIS_MODULE,
358 .init = geode_init_skcipher,
359 .exit = geode_exit_skcipher,
360 .setkey = geode_setkey_skcipher,
361 .encrypt = geode_ecb_encrypt,
362 .decrypt = geode_ecb_decrypt,
363 .min_keysize = AES_MIN_KEY_SIZE,
364 .max_keysize = AES_MAX_KEY_SIZE,
368 static void geode_aes_remove(struct pci_dev *dev)
370 crypto_unregister_alg(&geode_alg);
371 crypto_unregister_skciphers(geode_skcipher_algs,
372 ARRAY_SIZE(geode_skcipher_algs));
374 pci_iounmap(dev, _iobase);
377 pci_release_regions(dev);
378 pci_disable_device(dev);
382 static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
386 ret = pci_enable_device(dev);
390 ret = pci_request_regions(dev, "geode-aes");
394 _iobase = pci_iomap(dev, 0, 0);
396 if (_iobase == NULL) {
401 spin_lock_init(&lock);
403 /* Clear any pending activity */
404 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
406 ret = crypto_register_alg(&geode_alg);
410 ret = crypto_register_skciphers(geode_skcipher_algs,
411 ARRAY_SIZE(geode_skcipher_algs));
415 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
419 crypto_unregister_alg(&geode_alg);
422 pci_iounmap(dev, _iobase);
425 pci_release_regions(dev);
428 pci_disable_device(dev);
430 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
434 static struct pci_device_id geode_aes_tbl[] = {
435 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
439 MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
441 static struct pci_driver geode_aes_driver = {
442 .name = "Geode LX AES",
443 .id_table = geode_aes_tbl,
444 .probe = geode_aes_probe,
445 .remove = geode_aes_remove,
448 module_pci_driver(geode_aes_driver);
450 MODULE_AUTHOR("Advanced Micro Devices, Inc.");
451 MODULE_DESCRIPTION("Geode LX Hardware AES driver");
452 MODULE_LICENSE("GPL");