blob: fa5a9f207bc90afb94a26b101e8b018e3f3eb0aa [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/crypto.h>
#include <linux/spinlock.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/internal/cipher.h>
#include <crypto/internal/skcipher.h>
#include <linux/io.h>
#include <linux/delay.h>
#include "geode-aes.h"
/* Static structures */
static void __iomem *_iobase;
static DEFINE_SPINLOCK(lock);
/* Write a 128 bit field (either a writable key or IV) */
static inline void
_writefield(u32 offset, const void *value)
{
int i;
for (i = 0; i < 4; i++)
iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4));
}
/* Read a 128 bit field (either a writable key or IV) */
static inline void
_readfield(u32 offset, void *value)
{
int i;
for (i = 0; i < 4; i++)
((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4));
}
static int
do_crypt(const void *src, void *dst, u32 len, u32 flags)
{
u32 status;
u32 counter = AES_OP_TIMEOUT;
iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG);
iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
iowrite32(len, _iobase + AES_LENA_REG);
/* Start the operation */
iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG);
do {
status = ioread32(_iobase + AES_INTR_REG);
cpu_relax();
} while (!(status & AES_INTRA_PENDING) && --counter);
/* Clear the event */
iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG);
return counter ? 0 : 1;
}
static void
geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src,
void *dst, u32 len, u8 *iv, int mode, int dir)
{
u32 flags = 0;
unsigned long iflags;
int ret;
/* If the source and destination is the same, then
* we need to turn on the coherent flags, otherwise
* we don't need to worry
*/
flags |= (AES_CTRL_DCA | AES_CTRL_SCA);
if (dir == AES_DIR_ENCRYPT)
flags |= AES_CTRL_ENCRYPT;
/* Start the critical section */
spin_lock_irqsave(&lock, iflags);
if (mode == AES_MODE_CBC) {
flags |= AES_CTRL_CBC;
_writefield(AES_WRITEIV0_REG, iv);
}
flags |= AES_CTRL_WRKEY;
_writefield(AES_WRITEKEY0_REG, tctx->key);
ret = do_crypt(src, dst, len, flags);
BUG_ON(ret);
if (mode == AES_MODE_CBC)
_readfield(AES_WRITEIV0_REG, iv);
spin_unlock_irqrestore(&lock, iflags);
}
/* CRYPTO-API Functions */
static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
unsigned int len)
{
struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
tctx->keylen = len;
if (len == AES_KEYSIZE_128) {
memcpy(tctx->key, key, len);
return 0;
}
if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
/* not supported at all */
return -EINVAL;
/*
* The requested key size is not supported by HW, do a fallback
*/
tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
tctx->fallback.cip->base.crt_flags |=
(tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
return crypto_cipher_setkey(tctx->fallback.cip, key, len);
}
static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
unsigned int len)
{
struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
tctx->keylen = len;
if (len == AES_KEYSIZE_128) {
memcpy(tctx->key, key, len);
return 0;
}
if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
/* not supported at all */
return -EINVAL;
/*
* The requested key size is not supported by HW, do a fallback
*/
crypto_skcipher_clear_flags(tctx->fallback.skcipher,
CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(tctx->fallback.skcipher,
crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_MASK);
return crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
}
static void
geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
return;
}
geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
AES_MODE_ECB, AES_DIR_ENCRYPT);
}
static void
geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
return;
}
geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
AES_MODE_ECB, AES_DIR_DECRYPT);
}
static int fallback_init_cip(struct crypto_tfm *tfm)
{
const char *name = crypto_tfm_alg_name(tfm);
struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
tctx->fallback.cip = crypto_alloc_cipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(tctx->fallback.cip)) {
printk(KERN_ERR "Error allocating fallback algo %s\n", name);
return PTR_ERR(tctx->fallback.cip);
}
return 0;
}
static void fallback_exit_cip(struct crypto_tfm *tfm)
{
struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
crypto_free_cipher(tctx->fallback.cip);
}
static struct crypto_alg geode_alg = {
.cra_name = "aes",
.cra_driver_name = "geode-aes",
.cra_priority = 300,
.cra_alignmask = 15,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_init = fallback_init_cip,
.cra_exit = fallback_exit_cip,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = AES_MIN_KEY_SIZE,
.cia_max_keysize = AES_MAX_KEY_SIZE,
.cia_setkey = geode_setkey_cip,
.cia_encrypt = geode_encrypt,
.cia_decrypt = geode_decrypt
}
}
};
static int geode_init_skcipher(struct crypto_skcipher *tfm)
{
const char *name = crypto_tfm_alg_name(&tfm->base);
struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
tctx->fallback.skcipher =
crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK |
CRYPTO_ALG_ASYNC);
if (IS_ERR(tctx->fallback.skcipher)) {
printk(KERN_ERR "Error allocating fallback algo %s\n", name);
return PTR_ERR(tctx->fallback.skcipher);
}
crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
crypto_skcipher_reqsize(tctx->fallback.skcipher));
return 0;
}
static void geode_exit_skcipher(struct crypto_skcipher *tfm)
{
struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
crypto_free_skcipher(tctx->fallback.skcipher);
}
static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
struct skcipher_request *subreq = skcipher_request_ctx(req);
*subreq = *req;
skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
if (dir == AES_DIR_DECRYPT)
return crypto_skcipher_decrypt(subreq);
else
return crypto_skcipher_encrypt(subreq);
}
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) != 0) {
geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr,
round_down(nbytes, AES_BLOCK_SIZE),
walk.iv, mode, dir);
err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
}
return err;
}
static int geode_cbc_encrypt(struct skcipher_request *req)
{
return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
}
static int geode_cbc_decrypt(struct skcipher_request *req)
{
return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
}
static int geode_ecb_encrypt(struct skcipher_request *req)
{
return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
}
static int geode_ecb_decrypt(struct skcipher_request *req)
{
return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
}
static struct skcipher_alg geode_skcipher_algs[] = {
{
.base.cra_name = "cbc(aes)",
.base.cra_driver_name = "cbc-aes-geode",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
.base.cra_alignmask = 15,
.base.cra_module = THIS_MODULE,
.init = geode_init_skcipher,
.exit = geode_exit_skcipher,
.setkey = geode_setkey_skcipher,
.encrypt = geode_cbc_encrypt,
.decrypt = geode_cbc_decrypt,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
}, {
.base.cra_name = "ecb(aes)",
.base.cra_driver_name = "ecb-aes-geode",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
.base.cra_alignmask = 15,
.base.cra_module = THIS_MODULE,
.init = geode_init_skcipher,
.exit = geode_exit_skcipher,
.setkey = geode_setkey_skcipher,
.encrypt = geode_ecb_encrypt,
.decrypt = geode_ecb_decrypt,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
},
};
static void geode_aes_remove(struct pci_dev *dev)
{
crypto_unregister_alg(&geode_alg);
crypto_unregister_skciphers(geode_skcipher_algs,
ARRAY_SIZE(geode_skcipher_algs));
pci_iounmap(dev, _iobase);
_iobase = NULL;
pci_release_regions(dev);
pci_disable_device(dev);
}
static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int ret;
ret = pci_enable_device(dev);
if (ret)
return ret;
ret = pci_request_regions(dev, "geode-aes");
if (ret)
goto eenable;
_iobase = pci_iomap(dev, 0, 0);
if (_iobase == NULL) {
ret = -ENOMEM;
goto erequest;
}
/* Clear any pending activity */
iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG);
ret = crypto_register_alg(&geode_alg);
if (ret)
goto eiomap;
ret = crypto_register_skciphers(geode_skcipher_algs,
ARRAY_SIZE(geode_skcipher_algs));
if (ret)
goto ealg;
dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
return 0;
ealg:
crypto_unregister_alg(&geode_alg);
eiomap:
pci_iounmap(dev, _iobase);
erequest:
pci_release_regions(dev);
eenable:
pci_disable_device(dev);
dev_err(&dev->dev, "GEODE AES initialization failed.\n");
return ret;
}
static struct pci_device_id geode_aes_tbl[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
static struct pci_driver geode_aes_driver = {
.name = "Geode LX AES",
.id_table = geode_aes_tbl,
.probe = geode_aes_probe,
.remove = geode_aes_remove,
};
module_pci_driver(geode_aes_driver);
MODULE_AUTHOR("Advanced Micro Devices, Inc.");
MODULE_DESCRIPTION("Geode LX Hardware AES driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(CRYPTO_INTERNAL);