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 */
127 * The requested key size is not supported by HW, do a fallback
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);
133 ret = crypto_cipher_setkey(tctx->fallback.cip, key, len);
135 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
136 tfm->crt_flags |= (tctx->fallback.cip->base.crt_flags &
137 CRYPTO_TFM_RES_MASK);
142 static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
145 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
150 if (len == AES_KEYSIZE_128) {
151 memcpy(tctx->key, key, len);
155 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
156 /* not supported at all */
160 * The requested key size is not supported by HW, do a fallback
162 crypto_skcipher_clear_flags(tctx->fallback.skcipher,
163 CRYPTO_TFM_REQ_MASK);
164 crypto_skcipher_set_flags(tctx->fallback.skcipher,
165 crypto_skcipher_get_flags(tfm) &
166 CRYPTO_TFM_REQ_MASK);
167 ret = crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
168 crypto_skcipher_set_flags(tfm,
169 crypto_skcipher_get_flags(tctx->fallback.skcipher) &
170 CRYPTO_TFM_RES_MASK);
175 geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
177 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
179 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
180 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
184 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
185 AES_MODE_ECB, AES_DIR_ENCRYPT);
190 geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
192 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
194 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
195 crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
199 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
200 AES_MODE_ECB, AES_DIR_DECRYPT);
203 static int fallback_init_cip(struct crypto_tfm *tfm)
205 const char *name = crypto_tfm_alg_name(tfm);
206 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
208 tctx->fallback.cip = crypto_alloc_cipher(name, 0,
209 CRYPTO_ALG_NEED_FALLBACK);
211 if (IS_ERR(tctx->fallback.cip)) {
212 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
213 return PTR_ERR(tctx->fallback.cip);
219 static void fallback_exit_cip(struct crypto_tfm *tfm)
221 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
223 crypto_free_cipher(tctx->fallback.cip);
226 static struct crypto_alg geode_alg = {
228 .cra_driver_name = "geode-aes",
231 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
232 CRYPTO_ALG_NEED_FALLBACK,
233 .cra_init = fallback_init_cip,
234 .cra_exit = fallback_exit_cip,
235 .cra_blocksize = AES_BLOCK_SIZE,
236 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
237 .cra_module = THIS_MODULE,
240 .cia_min_keysize = AES_MIN_KEY_SIZE,
241 .cia_max_keysize = AES_MAX_KEY_SIZE,
242 .cia_setkey = geode_setkey_cip,
243 .cia_encrypt = geode_encrypt,
244 .cia_decrypt = geode_decrypt
249 static int geode_init_skcipher(struct crypto_skcipher *tfm)
251 const char *name = crypto_tfm_alg_name(&tfm->base);
252 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
254 tctx->fallback.skcipher =
255 crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |
257 if (IS_ERR(tctx->fallback.skcipher)) {
258 printk(KERN_ERR "Error allocating fallback algo %s\n", name);
259 return PTR_ERR(tctx->fallback.skcipher);
262 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
263 crypto_skcipher_reqsize(tctx->fallback.skcipher));
267 static void geode_exit_skcipher(struct crypto_skcipher *tfm)
269 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
271 crypto_free_skcipher(tctx->fallback.skcipher);
274 static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
276 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
277 const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
278 struct skcipher_walk walk;
282 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
283 struct skcipher_request *subreq = skcipher_request_ctx(req);
286 skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
287 if (dir == AES_DIR_DECRYPT)
288 return crypto_skcipher_decrypt(subreq);
290 return crypto_skcipher_encrypt(subreq);
293 err = skcipher_walk_virt(&walk, req, false);
295 while ((nbytes = walk.nbytes) != 0) {
296 geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,
297 round_down(nbytes, AES_BLOCK_SIZE),
299 err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
305 static int geode_cbc_encrypt(struct skcipher_request *req)
307 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
310 static int geode_cbc_decrypt(struct skcipher_request *req)
312 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
315 static int geode_ecb_encrypt(struct skcipher_request *req)
317 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
320 static int geode_ecb_decrypt(struct skcipher_request *req)
322 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
325 static struct skcipher_alg geode_skcipher_algs[] = {
327 .base.cra_name = "cbc(aes)",
328 .base.cra_driver_name = "cbc-aes-geode",
329 .base.cra_priority = 400,
330 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
331 CRYPTO_ALG_NEED_FALLBACK,
332 .base.cra_blocksize = AES_BLOCK_SIZE,
333 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
334 .base.cra_alignmask = 15,
335 .base.cra_module = THIS_MODULE,
336 .init = geode_init_skcipher,
337 .exit = geode_exit_skcipher,
338 .setkey = geode_setkey_skcipher,
339 .encrypt = geode_cbc_encrypt,
340 .decrypt = geode_cbc_decrypt,
341 .min_keysize = AES_MIN_KEY_SIZE,
342 .max_keysize = AES_MAX_KEY_SIZE,
343 .ivsize = AES_BLOCK_SIZE,
345 .base.cra_name = "ecb(aes)",
346 .base.cra_driver_name = "ecb-aes-geode",
347 .base.cra_priority = 400,
348 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
349 CRYPTO_ALG_NEED_FALLBACK,
350 .base.cra_blocksize = AES_BLOCK_SIZE,
351 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
352 .base.cra_alignmask = 15,
353 .base.cra_module = THIS_MODULE,
354 .init = geode_init_skcipher,
355 .exit = geode_exit_skcipher,
356 .setkey = geode_setkey_skcipher,
357 .encrypt = geode_ecb_encrypt,
358 .decrypt = geode_ecb_decrypt,
359 .min_keysize = AES_MIN_KEY_SIZE,
360 .max_keysize = AES_MAX_KEY_SIZE,
364 static void geode_aes_remove(struct pci_dev *dev)
366 crypto_unregister_alg(&geode_alg);
367 crypto_unregister_skciphers(geode_skcipher_algs,
368 ARRAY_SIZE(geode_skcipher_algs));
370 pci_iounmap(dev, _iobase);
373 pci_release_regions(dev);
374 pci_disable_device(dev);
378 static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
382 ret = pci_enable_device(dev);
386 ret = pci_request_regions(dev, "geode-aes");
390 _iobase = pci_iomap(dev, 0, 0);
392 if (_iobase == NULL) {
397 spin_lock_init(&lock);
399 /* Clear any pending activity */
400 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
402 ret = crypto_register_alg(&geode_alg);
406 ret = crypto_register_skciphers(geode_skcipher_algs,
407 ARRAY_SIZE(geode_skcipher_algs));
411 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
415 crypto_unregister_alg(&geode_alg);
418 pci_iounmap(dev, _iobase);
421 pci_release_regions(dev);
424 pci_disable_device(dev);
426 dev_err(&dev->dev, "GEODE AES initialization failed.\n");
430 static struct pci_device_id geode_aes_tbl[] = {
431 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
435 MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
437 static struct pci_driver geode_aes_driver = {
438 .name = "Geode LX AES",
439 .id_table = geode_aes_tbl,
440 .probe = geode_aes_probe,
441 .remove = geode_aes_remove,
444 module_pci_driver(geode_aes_driver);
446 MODULE_AUTHOR("Advanced Micro Devices, Inc.");
447 MODULE_DESCRIPTION("Geode LX Hardware AES driver");
448 MODULE_LICENSE("GPL");