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1// SPDX-License-Identifier: GPL-2.0-or-later2 /* 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/cipher.h>14#include <crypto/internal/skcipher.h>15 16#include <linux/io.h>17#include <linux/delay.h>18 19#include "geode-aes.h"20 21/* Static structures */22 23static void __iomem *_iobase;24static DEFINE_SPINLOCK(lock);25 26/* Write a 128 bit field (either a writable key or IV) */27static inline void28_writefield(u32 offset, const void *value)29{30 int i;31 32 for (i = 0; i < 4; i++)33 iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));34}35 36/* Read a 128 bit field (either a writable key or IV) */37static inline void38_readfield(u32 offset, void *value)39{40 int i;41 42 for (i = 0; i < 4; i++)43 ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));44}45 46static int47do_crypt(const void *src, void *dst, u32 len, u32 flags)48{49 u32 status;50 u32 counter = AES_OP_TIMEOUT;51 52 iowrite32(virt_to_phys((void *)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 void70geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,71 void *dst, u32 len, u8 *iv, int mode, int dir)72{73 u32 flags = 0;74 unsigned long iflags;75 int ret;76 77 /* If the source and destination is the same, then78 * we need to turn on the coherent flags, otherwise79 * we don't need to worry80 */81 82 flags |= (AES_CTRL_DCA | AES_CTRL_SCA);83 84 if (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 (mode == AES_MODE_CBC) {92 flags |= AES_CTRL_CBC;93 _writefield(AES_WRITEIV0_REG, iv);94 }95 96 flags |= AES_CTRL_WRKEY;97 _writefield(AES_WRITEKEY0_REG, tctx->key);98 99 ret = do_crypt(src, dst, len, flags);100 BUG_ON(ret);101 102 if (mode == AES_MODE_CBC)103 _readfield(AES_WRITEIV0_REG, iv);104 105 spin_unlock_irqrestore(&lock, iflags);106}107 108/* CRYPTO-API Functions */109 110static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,111 unsigned int len)112{113 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);114 115 tctx->keylen = len;116 117 if (len == AES_KEYSIZE_128) {118 memcpy(tctx->key, key, len);119 return 0;120 }121 122 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)123 /* not supported at all */124 return -EINVAL;125 126 /*127 * The requested key size is not supported by HW, do a fallback128 */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);132 133 return crypto_cipher_setkey(tctx->fallback.cip, key, len);134}135 136static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,137 unsigned int len)138{139 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);140 141 tctx->keylen = len;142 143 if (len == AES_KEYSIZE_128) {144 memcpy(tctx->key, key, len);145 return 0;146 }147 148 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)149 /* not supported at all */150 return -EINVAL;151 152 /*153 * The requested key size is not supported by HW, do a fallback154 */155 crypto_skcipher_clear_flags(tctx->fallback.skcipher,156 CRYPTO_TFM_REQ_MASK);157 crypto_skcipher_set_flags(tctx->fallback.skcipher,158 crypto_skcipher_get_flags(tfm) &159 CRYPTO_TFM_REQ_MASK);160 return crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);161}162 163static void164geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)165{166 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);167 168 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {169 crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);170 return;171 }172 173 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,174 AES_MODE_ECB, AES_DIR_ENCRYPT);175}176 177 178static void179geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)180{181 const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);182 183 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {184 crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);185 return;186 }187 188 geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,189 AES_MODE_ECB, AES_DIR_DECRYPT);190}191 192static int fallback_init_cip(struct crypto_tfm *tfm)193{194 const char *name = crypto_tfm_alg_name(tfm);195 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);196 197 tctx->fallback.cip = crypto_alloc_cipher(name, 0,198 CRYPTO_ALG_NEED_FALLBACK);199 200 if (IS_ERR(tctx->fallback.cip)) {201 printk(KERN_ERR "Error allocating fallback algo %s\n", name);202 return PTR_ERR(tctx->fallback.cip);203 }204 205 return 0;206}207 208static void fallback_exit_cip(struct crypto_tfm *tfm)209{210 struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);211 212 crypto_free_cipher(tctx->fallback.cip);213}214 215static struct crypto_alg geode_alg = {216 .cra_name = "aes",217 .cra_driver_name = "geode-aes",218 .cra_priority = 300,219 .cra_alignmask = 15,220 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |221 CRYPTO_ALG_NEED_FALLBACK,222 .cra_init = fallback_init_cip,223 .cra_exit = fallback_exit_cip,224 .cra_blocksize = AES_BLOCK_SIZE,225 .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),226 .cra_module = THIS_MODULE,227 .cra_u = {228 .cipher = {229 .cia_min_keysize = AES_MIN_KEY_SIZE,230 .cia_max_keysize = AES_MAX_KEY_SIZE,231 .cia_setkey = geode_setkey_cip,232 .cia_encrypt = geode_encrypt,233 .cia_decrypt = geode_decrypt234 }235 }236};237 238static int geode_init_skcipher(struct crypto_skcipher *tfm)239{240 const char *name = crypto_tfm_alg_name(&tfm->base);241 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);242 243 tctx->fallback.skcipher =244 crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |245 CRYPTO_ALG_ASYNC);246 if (IS_ERR(tctx->fallback.skcipher)) {247 printk(KERN_ERR "Error allocating fallback algo %s\n", name);248 return PTR_ERR(tctx->fallback.skcipher);249 }250 251 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +252 crypto_skcipher_reqsize(tctx->fallback.skcipher));253 return 0;254}255 256static void geode_exit_skcipher(struct crypto_skcipher *tfm)257{258 struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);259 260 crypto_free_skcipher(tctx->fallback.skcipher);261}262 263static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)264{265 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);266 const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);267 struct skcipher_walk walk;268 unsigned int nbytes;269 int err;270 271 if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {272 struct skcipher_request *subreq = skcipher_request_ctx(req);273 274 *subreq = *req;275 skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);276 if (dir == AES_DIR_DECRYPT)277 return crypto_skcipher_decrypt(subreq);278 else279 return crypto_skcipher_encrypt(subreq);280 }281 282 err = skcipher_walk_virt(&walk, req, false);283 284 while ((nbytes = walk.nbytes) != 0) {285 geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,286 round_down(nbytes, AES_BLOCK_SIZE),287 walk.iv, mode, dir);288 err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);289 }290 291 return err;292}293 294static int geode_cbc_encrypt(struct skcipher_request *req)295{296 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);297}298 299static int geode_cbc_decrypt(struct skcipher_request *req)300{301 return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);302}303 304static int geode_ecb_encrypt(struct skcipher_request *req)305{306 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);307}308 309static int geode_ecb_decrypt(struct skcipher_request *req)310{311 return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);312}313 314static struct skcipher_alg geode_skcipher_algs[] = {315 {316 .base.cra_name = "cbc(aes)",317 .base.cra_driver_name = "cbc-aes-geode",318 .base.cra_priority = 400,319 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |320 CRYPTO_ALG_NEED_FALLBACK,321 .base.cra_blocksize = AES_BLOCK_SIZE,322 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),323 .base.cra_alignmask = 15,324 .base.cra_module = THIS_MODULE,325 .init = geode_init_skcipher,326 .exit = geode_exit_skcipher,327 .setkey = geode_setkey_skcipher,328 .encrypt = geode_cbc_encrypt,329 .decrypt = geode_cbc_decrypt,330 .min_keysize = AES_MIN_KEY_SIZE,331 .max_keysize = AES_MAX_KEY_SIZE,332 .ivsize = AES_BLOCK_SIZE,333 }, {334 .base.cra_name = "ecb(aes)",335 .base.cra_driver_name = "ecb-aes-geode",336 .base.cra_priority = 400,337 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |338 CRYPTO_ALG_NEED_FALLBACK,339 .base.cra_blocksize = AES_BLOCK_SIZE,340 .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),341 .base.cra_alignmask = 15,342 .base.cra_module = THIS_MODULE,343 .init = geode_init_skcipher,344 .exit = geode_exit_skcipher,345 .setkey = geode_setkey_skcipher,346 .encrypt = geode_ecb_encrypt,347 .decrypt = geode_ecb_decrypt,348 .min_keysize = AES_MIN_KEY_SIZE,349 .max_keysize = AES_MAX_KEY_SIZE,350 },351};352 353static void geode_aes_remove(struct pci_dev *dev)354{355 crypto_unregister_alg(&geode_alg);356 crypto_unregister_skciphers(geode_skcipher_algs,357 ARRAY_SIZE(geode_skcipher_algs));358 359 pci_iounmap(dev, _iobase);360 _iobase = NULL;361 362 pci_release_regions(dev);363 pci_disable_device(dev);364}365 366 367static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)368{369 int ret;370 371 ret = pci_enable_device(dev);372 if (ret)373 return ret;374 375 ret = pci_request_regions(dev, "geode-aes");376 if (ret)377 goto eenable;378 379 _iobase = pci_iomap(dev, 0, 0);380 381 if (_iobase == NULL) {382 ret = -ENOMEM;383 goto erequest;384 }385 386 /* Clear any pending activity */387 iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);388 389 ret = crypto_register_alg(&geode_alg);390 if (ret)391 goto eiomap;392 393 ret = crypto_register_skciphers(geode_skcipher_algs,394 ARRAY_SIZE(geode_skcipher_algs));395 if (ret)396 goto ealg;397 398 dev_notice(&dev->dev, "GEODE AES engine enabled.\n");399 return 0;400 401 ealg:402 crypto_unregister_alg(&geode_alg);403 404 eiomap:405 pci_iounmap(dev, _iobase);406 407 erequest:408 pci_release_regions(dev);409 410 eenable:411 pci_disable_device(dev);412 413 dev_err(&dev->dev, "GEODE AES initialization failed.\n");414 return ret;415}416 417static struct pci_device_id geode_aes_tbl[] = {418 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },419 { 0, }420};421 422MODULE_DEVICE_TABLE(pci, geode_aes_tbl);423 424static struct pci_driver geode_aes_driver = {425 .name = "Geode LX AES",426 .id_table = geode_aes_tbl,427 .probe = geode_aes_probe,428 .remove = geode_aes_remove,429};430 431module_pci_driver(geode_aes_driver);432 433MODULE_AUTHOR("Advanced Micro Devices, Inc.");434MODULE_DESCRIPTION("Geode LX Hardware AES driver");435MODULE_LICENSE("GPL");436MODULE_IMPORT_NS(CRYPTO_INTERNAL);437