[linux-block.git] / drivers / crypto / geode-aes.c

// 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/skcipher.h>

#include <linux/io.h>
#include <linux/delay.h>

#include "geode-aes.h"

/* Static structures */

static void __iomem *_iobase;
static spinlock_t 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);
	unsigned int ret;

	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);

	ret = crypto_cipher_setkey(tctx->fallback.cip, key, len);
	if (ret) {
		tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
		tfm->crt_flags |= (tctx->fallback.cip->base.crt_flags &
				   CRYPTO_TFM_RES_MASK);
	}
	return ret;
}

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);
	unsigned int ret;

	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);
	ret = crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
	crypto_skcipher_set_flags(tfm,
				  crypto_skcipher_get_flags(tctx->fallback.skcipher) &
				  CRYPTO_TFM_RES_MASK);
	return ret;
}

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;
	}

	spin_lock_init(&lock);

	/* 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");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
9fe757b0	2	/* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
24086e3d	3	*/
9fe757b0 JC	4
	5	#include <linux/module.h>
	6	#include <linux/kernel.h>
9fe757b0 JC	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>
89e12654	12	#include <crypto/aes.h>
4549f7e5	13	#include <crypto/internal/skcipher.h>
9fe757b0	14
99700716 CC	15	#include <linux/io.h>
99700716 CC	16	#include <linux/delay.h>
9fe757b0 JC	17
	18	#include "geode-aes.h"
	19
9fe757b0 JC	20	/* Static structures */
9fe757b0 JC	21
99700716	22	static void __iomem *_iobase;
9fe757b0 JC	23	static spinlock_t lock;
	24
	25	/* Write a 128 bit field (either a writable key or IV) */
	26	static inline void
4549f7e5	27	_writefield(u32 offset, const void *value)
9fe757b0 JC	28	{
9fe757b0 JC	29	int i;
24086e3d	30
99700716	31	for (i = 0; i < 4; i++)
4549f7e5	32	iowrite32(((const u32 ) value)[i], _iobase + offset + (i 4));
9fe757b0 JC	33	}
	34
	35	/* Read a 128 bit field (either a writable key or IV) */
	36	static inline void
	37	_readfield(u32 offset, void *value)
	38	{
	39	int i;
24086e3d	40
99700716	41	for (i = 0; i < 4; i++)
9fe757b0 JC	42	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	43	}
	44
	45	static int
4549f7e5	46	do_crypt(const void src, void dst, u32 len, u32 flags)
9fe757b0 JC	47	{
	48	u32 status;
	49	u32 counter = AES_OP_TIMEOUT;
	50
4549f7e5	51	iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG);
9fe757b0 JC	52	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
	53	iowrite32(len, _iobase + AES_LENA_REG);
	54
	55	/* Start the operation */
	56	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
	57
1f4e4773	58	do {
9fe757b0	59	status = ioread32(_iobase + AES_INTR_REG);
1f4e4773	60	cpu_relax();
99700716	61	} while (!(status & AES_INTRA_PENDING) && --counter);
9fe757b0 JC	62
	63	/* Clear the event */
	64	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
	65	return counter ? 0 : 1;
	66	}
	67
4549f7e5 EB	68	static void
	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)
9fe757b0	71	{
9fe757b0	72	u32 flags = 0;
5efee174	73	unsigned long iflags;
1f4e4773	74	int ret;
9fe757b0	75
761e7846 JC	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
	79	*/
	80
2e21630d	81	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0	82
4549f7e5	83	if (dir == AES_DIR_ENCRYPT)
9fe757b0 JC	84	flags \|= AES_CTRL_ENCRYPT;
	85
	86	/* Start the critical section */
	87
	88	spin_lock_irqsave(&lock, iflags);
	89
4549f7e5	90	if (mode == AES_MODE_CBC) {
9fe757b0	91	flags \|= AES_CTRL_CBC;
4549f7e5	92	_writefield(AES_WRITEIV0_REG, iv);
9fe757b0 JC	93	}
9fe757b0 JC	94
4549f7e5 EB	95	flags \|= AES_CTRL_WRKEY;
4549f7e5 EB	96	_writefield(AES_WRITEKEY0_REG, tctx->key);
9fe757b0	97
4549f7e5	98	ret = do_crypt(src, dst, len, flags);
1f4e4773	99	BUG_ON(ret);
9fe757b0	100
4549f7e5 EB	101	if (mode == AES_MODE_CBC)
4549f7e5 EB	102	_readfield(AES_WRITEIV0_REG, iv);
9fe757b0 JC	103
9fe757b0 JC	104	spin_unlock_irqrestore(&lock, iflags);
9fe757b0 JC	105	}
	106
	107	/* CRYPTO-API Functions */
	108
cd7c3bfe SS	109	static int geode_setkey_cip(struct crypto_tfm tfm, const u8 key,
cd7c3bfe SS	110	unsigned int len)
9fe757b0	111	{
4549f7e5	112	struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
cd7c3bfe SS	113	unsigned int ret;
cd7c3bfe SS	114
4549f7e5	115	tctx->keylen = len;
cd7c3bfe SS	116
cd7c3bfe SS	117	if (len == AES_KEYSIZE_128) {
4549f7e5	118	memcpy(tctx->key, key, len);
cd7c3bfe SS	119	return 0;
cd7c3bfe SS	120	}
9fe757b0	121
674f368a	122	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
cd7c3bfe	123	/* not supported at all */
9fe757b0	124	return -EINVAL;
9fe757b0	125
cd7c3bfe SS	126	/*
	127	* The requested key size is not supported by HW, do a fallback
	128	*/
4549f7e5 EB	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);
cd7c3bfe	132
4549f7e5	133	ret = crypto_cipher_setkey(tctx->fallback.cip, key, len);
cd7c3bfe SS	134	if (ret) {
cd7c3bfe SS	135	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
4549f7e5 EB	136	tfm->crt_flags \|= (tctx->fallback.cip->base.crt_flags &
4549f7e5 EB	137	CRYPTO_TFM_RES_MASK);
cd7c3bfe SS	138	}
	139	return ret;
	140	}
	141
4549f7e5 EB	142	static int geode_setkey_skcipher(struct crypto_skcipher tfm, const u8 key,
4549f7e5 EB	143	unsigned int len)
cd7c3bfe	144	{
4549f7e5	145	struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
cd7c3bfe SS	146	unsigned int ret;
cd7c3bfe SS	147
4549f7e5	148	tctx->keylen = len;
cd7c3bfe SS	149
cd7c3bfe SS	150	if (len == AES_KEYSIZE_128) {
4549f7e5	151	memcpy(tctx->key, key, len);
cd7c3bfe SS	152	return 0;
	153	}
	154
674f368a	155	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
cd7c3bfe	156	/* not supported at all */
cd7c3bfe	157	return -EINVAL;
cd7c3bfe SS	158
	159	/*
	160	* The requested key size is not supported by HW, do a fallback
	161	*/
4549f7e5 EB	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);
cd7c3bfe SS	171	return ret;
	172	}
	173
9fe757b0 JC	174	static void
	175	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	176	{
4549f7e5	177	const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
9fe757b0	178
4549f7e5 EB	179	if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
4549f7e5 EB	180	crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
9fe757b0	181	return;
cd7c3bfe	182	}
9fe757b0	183
4549f7e5 EB	184	geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
4549f7e5 EB	185	AES_MODE_ECB, AES_DIR_ENCRYPT);
9fe757b0 JC	186	}
	187
	188
	189	static void
	190	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	191	{
4549f7e5	192	const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
9fe757b0	193
4549f7e5 EB	194	if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
4549f7e5 EB	195	crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
9fe757b0	196	return;
cd7c3bfe	197	}
9fe757b0	198
4549f7e5 EB	199	geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
4549f7e5 EB	200	AES_MODE_ECB, AES_DIR_DECRYPT);
9fe757b0 JC	201	}
9fe757b0 JC	202
cd7c3bfe SS	203	static int fallback_init_cip(struct crypto_tfm *tfm)
cd7c3bfe SS	204	{
d207a38c	205	const char *name = crypto_tfm_alg_name(tfm);
4549f7e5	206	struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
cd7c3bfe	207
4549f7e5 EB	208	tctx->fallback.cip = crypto_alloc_cipher(name, 0,
4549f7e5 EB	209	CRYPTO_ALG_NEED_FALLBACK);
cd7c3bfe	210
4549f7e5	211	if (IS_ERR(tctx->fallback.cip)) {
cd7c3bfe	212	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
4549f7e5	213	return PTR_ERR(tctx->fallback.cip);
cd7c3bfe SS	214	}
	215
	216	return 0;
	217	}
	218
	219	static void fallback_exit_cip(struct crypto_tfm *tfm)
	220	{
4549f7e5	221	struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
cd7c3bfe	222
4549f7e5	223	crypto_free_cipher(tctx->fallback.cip);
cd7c3bfe	224	}
9fe757b0 JC	225
9fe757b0 JC	226	static struct crypto_alg geode_alg = {
cd7c3bfe SS	227	.cra_name = "aes",
	228	.cra_driver_name = "geode-aes",
	229	.cra_priority = 300,
	230	.cra_alignmask = 15,
	231	.cra_flags = CRYPTO_ALG_TYPE_CIPHER \|
	232	CRYPTO_ALG_NEED_FALLBACK,
	233	.cra_init = fallback_init_cip,
	234	.cra_exit = fallback_exit_cip,
b9d865e3	235	.cra_blocksize = AES_BLOCK_SIZE,
4549f7e5	236	.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
cd7c3bfe	237	.cra_module = THIS_MODULE,
cd7c3bfe SS	238	.cra_u = {
	239	.cipher = {
	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
9fe757b0 JC	245	}
	246	}
	247	};
	248
4549f7e5	249	static int geode_init_skcipher(struct crypto_skcipher *tfm)
9fe757b0	250	{
4549f7e5 EB	251	const char *name = crypto_tfm_alg_name(&tfm->base);
4549f7e5 EB	252	struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
cd7c3bfe	253
4549f7e5 EB	254	tctx->fallback.skcipher =
	255	crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK \|
	256	CRYPTO_ALG_ASYNC);
	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);
9fe757b0 JC	260	}
9fe757b0 JC	261
4549f7e5 EB	262	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
	263	crypto_skcipher_reqsize(tctx->fallback.skcipher));
	264	return 0;
9fe757b0 JC	265	}
9fe757b0 JC	266
4549f7e5	267	static void geode_exit_skcipher(struct crypto_skcipher *tfm)
9fe757b0	268	{
4549f7e5	269	struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
9fe757b0	270
4549f7e5 EB	271	crypto_free_skcipher(tctx->fallback.skcipher);
4549f7e5 EB	272	}
cd7c3bfe	273
4549f7e5 EB	274	static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir)
	275	{
	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;
	279	unsigned int nbytes;
	280	int err;
	281
	282	if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
	283	struct skcipher_request *subreq = skcipher_request_ctx(req);
	284
	285	subreq = req;
	286	skcipher_request_set_tfm(subreq, tctx->fallback.skcipher);
	287	if (dir == AES_DIR_DECRYPT)
	288	return crypto_skcipher_decrypt(subreq);
	289	else
	290	return crypto_skcipher_encrypt(subreq);
	291	}
9fe757b0	292
4549f7e5	293	err = skcipher_walk_virt(&walk, req, false);
9fe757b0	294
4549f7e5 EB	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),
	298	walk.iv, mode, dir);
	299	err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	300	}
	301
	302	return err;
	303	}
	304
4549f7e5	305	static int geode_cbc_encrypt(struct skcipher_request *req)
cd7c3bfe	306	{
4549f7e5	307	return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
cd7c3bfe SS	308	}
cd7c3bfe SS	309
4549f7e5	310	static int geode_cbc_decrypt(struct skcipher_request *req)
cd7c3bfe	311	{
4549f7e5	312	return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
cd7c3bfe SS	313	}
cd7c3bfe SS	314
4549f7e5	315	static int geode_ecb_encrypt(struct skcipher_request *req)
9fe757b0	316	{
4549f7e5	317	return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
9fe757b0 JC	318	}
9fe757b0 JC	319
4549f7e5	320	static int geode_ecb_decrypt(struct skcipher_request *req)
9fe757b0	321	{
4549f7e5	322	return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
9fe757b0 JC	323	}
9fe757b0 JC	324
4549f7e5 EB	325	static struct skcipher_alg geode_skcipher_algs[] = {
	326	{
	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,
	344	}, {
	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,
	361	},
9fe757b0 JC	362	};
9fe757b0 JC	363
49cfe4db	364	static void geode_aes_remove(struct pci_dev *dev)
9fe757b0 JC	365	{
9fe757b0 JC	366	crypto_unregister_alg(&geode_alg);
4549f7e5 EB	367	crypto_unregister_skciphers(geode_skcipher_algs,
4549f7e5 EB	368	ARRAY_SIZE(geode_skcipher_algs));
9fe757b0 JC	369
	370	pci_iounmap(dev, _iobase);
	371	_iobase = NULL;
	372
	373	pci_release_regions(dev);
	374	pci_disable_device(dev);
	375	}
	376
	377
49cfe4db	378	static int geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
9fe757b0 JC	379	{
9fe757b0 JC	380	int ret;
24086e3d	381
99700716 CC	382	ret = pci_enable_device(dev);
99700716 CC	383	if (ret)
9fe757b0 JC	384	return ret;
9fe757b0 JC	385
99700716 CC	386	ret = pci_request_regions(dev, "geode-aes");
99700716 CC	387	if (ret)
9fe757b0 JC	388	goto eenable;
	389
	390	_iobase = pci_iomap(dev, 0, 0);
	391
	392	if (_iobase == NULL) {
	393	ret = -ENOMEM;
	394	goto erequest;
	395	}
	396
	397	spin_lock_init(&lock);
	398
	399	/* Clear any pending activity */
	400	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
	401
99700716 CC	402	ret = crypto_register_alg(&geode_alg);
99700716 CC	403	if (ret)
9fe757b0 JC	404	goto eiomap;
9fe757b0 JC	405
4549f7e5 EB	406	ret = crypto_register_skciphers(geode_skcipher_algs,
4549f7e5 EB	407	ARRAY_SIZE(geode_skcipher_algs));
99700716	408	if (ret)
9fe757b0 JC	409	goto ealg;
9fe757b0 JC	410
701bcbc1	411	dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
9fe757b0 JC	412	return 0;
9fe757b0 JC	413
9fe757b0 JC	414	ealg:
	415	crypto_unregister_alg(&geode_alg);
	416
	417	eiomap:
	418	pci_iounmap(dev, _iobase);
	419
	420	erequest:
	421	pci_release_regions(dev);
	422
	423	eenable:
	424	pci_disable_device(dev);
	425
701bcbc1	426	dev_err(&dev->dev, "GEODE AES initialization failed.\n");
9fe757b0 JC	427	return ret;
	428	}
	429
	430	static struct pci_device_id geode_aes_tbl[] = {
24086e3d	431	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
9fe757b0 JC	432	{ 0, }
	433	};
	434
	435	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
	436
	437	static struct pci_driver geode_aes_driver = {
	438	.name = "Geode LX AES",
	439	.id_table = geode_aes_tbl,
	440	.probe = geode_aes_probe,
49cfe4db	441	.remove = geode_aes_remove,
9fe757b0 JC	442	};
9fe757b0 JC	443
49d30d3d	444	module_pci_driver(geode_aes_driver);
9fe757b0 JC	445
	446	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	447	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	448	MODULE_LICENSE("GPL");