[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/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);
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>
0eb76ba2	13	#include <crypto/internal/cipher.h>
4549f7e5	14	#include <crypto/internal/skcipher.h>
9fe757b0	15
99700716 CC	16	#include <linux/io.h>
99700716 CC	17	#include <linux/delay.h>
9fe757b0 JC	18
	19	#include "geode-aes.h"
	20
9fe757b0 JC	21	/* Static structures */
9fe757b0 JC	22
99700716	23	static void __iomem *_iobase;
25ee76a2	24	static DEFINE_SPINLOCK(lock);
9fe757b0 JC	25
	26	/* Write a 128 bit field (either a writable key or IV) */
	27	static inline void
4549f7e5	28	_writefield(u32 offset, const void *value)
9fe757b0 JC	29	{
9fe757b0 JC	30	int i;
24086e3d	31
99700716	32	for (i = 0; i < 4; i++)
4549f7e5	33	iowrite32(((const u32 ) value)[i], _iobase + offset + (i 4));
9fe757b0 JC	34	}
	35
	36	/* Read a 128 bit field (either a writable key or IV) */
	37	static inline void
	38	_readfield(u32 offset, void *value)
	39	{
	40	int i;
24086e3d	41
99700716	42	for (i = 0; i < 4; i++)
9fe757b0 JC	43	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	44	}
	45
	46	static int
4549f7e5	47	do_crypt(const void src, void dst, u32 len, u32 flags)
9fe757b0 JC	48	{
	49	u32 status;
	50	u32 counter = AES_OP_TIMEOUT;
	51
4549f7e5	52	iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG);
9fe757b0 JC	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
1f4e4773	59	do {
9fe757b0	60	status = ioread32(_iobase + AES_INTR_REG);
1f4e4773	61	cpu_relax();
99700716	62	} while (!(status & AES_INTRA_PENDING) && --counter);
9fe757b0 JC	63
	64	/* Clear the event */
	65	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
	66	return counter ? 0 : 1;
	67	}
	68
4549f7e5 EB	69	static void
	70	geode_aes_crypt(const struct geode_aes_tfm_ctx tctx, const void src,
	71	void dst, u32 len, u8 iv, int mode, int dir)
9fe757b0	72	{
9fe757b0	73	u32 flags = 0;
5efee174	74	unsigned long iflags;
1f4e4773	75	int ret;
9fe757b0	76
761e7846 JC	77	/* If the source and destination is the same, then
	78	* we need to turn on the coherent flags, otherwise
	79	* we don't need to worry
	80	*/
	81
2e21630d	82	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0	83
4549f7e5	84	if (dir == AES_DIR_ENCRYPT)
9fe757b0 JC	85	flags \|= AES_CTRL_ENCRYPT;
	86
	87	/* Start the critical section */
	88
	89	spin_lock_irqsave(&lock, iflags);
	90
4549f7e5	91	if (mode == AES_MODE_CBC) {
9fe757b0	92	flags \|= AES_CTRL_CBC;
4549f7e5	93	_writefield(AES_WRITEIV0_REG, iv);
9fe757b0 JC	94	}
9fe757b0 JC	95
4549f7e5 EB	96	flags \|= AES_CTRL_WRKEY;
4549f7e5 EB	97	_writefield(AES_WRITEKEY0_REG, tctx->key);
9fe757b0	98
4549f7e5	99	ret = do_crypt(src, dst, len, flags);
1f4e4773	100	BUG_ON(ret);
9fe757b0	101
4549f7e5 EB	102	if (mode == AES_MODE_CBC)
4549f7e5 EB	103	_readfield(AES_WRITEIV0_REG, iv);
9fe757b0 JC	104
9fe757b0 JC	105	spin_unlock_irqrestore(&lock, iflags);
9fe757b0 JC	106	}
	107
	108	/* CRYPTO-API Functions */
	109
cd7c3bfe SS	110	static int geode_setkey_cip(struct crypto_tfm tfm, const u8 key,
cd7c3bfe SS	111	unsigned int len)
9fe757b0	112	{
4549f7e5	113	struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
cd7c3bfe	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
af5034e8	133	return crypto_cipher_setkey(tctx->fallback.cip, key, len);
cd7c3bfe SS	134	}
cd7c3bfe SS	135
4549f7e5 EB	136	static int geode_setkey_skcipher(struct crypto_skcipher tfm, const u8 key,
4549f7e5 EB	137	unsigned int len)
cd7c3bfe	138	{
4549f7e5	139	struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
cd7c3bfe	140
4549f7e5	141	tctx->keylen = len;
cd7c3bfe SS	142
cd7c3bfe SS	143	if (len == AES_KEYSIZE_128) {
4549f7e5	144	memcpy(tctx->key, key, len);
cd7c3bfe SS	145	return 0;
	146	}
	147
674f368a	148	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256)
cd7c3bfe	149	/* not supported at all */
cd7c3bfe	150	return -EINVAL;
cd7c3bfe SS	151
	152	/*
	153	* The requested key size is not supported by HW, do a fallback
	154	*/
4549f7e5 EB	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);
af5034e8	160	return crypto_skcipher_setkey(tctx->fallback.skcipher, key, len);
cd7c3bfe SS	161	}
cd7c3bfe SS	162
9fe757b0 JC	163	static void
	164	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	165	{
4549f7e5	166	const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
9fe757b0	167
4549f7e5 EB	168	if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
4549f7e5 EB	169	crypto_cipher_encrypt_one(tctx->fallback.cip, out, in);
9fe757b0	170	return;
cd7c3bfe	171	}
9fe757b0	172
4549f7e5 EB	173	geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
4549f7e5 EB	174	AES_MODE_ECB, AES_DIR_ENCRYPT);
9fe757b0 JC	175	}
	176
	177
	178	static void
	179	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	180	{
4549f7e5	181	const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
9fe757b0	182
4549f7e5 EB	183	if (unlikely(tctx->keylen != AES_KEYSIZE_128)) {
4549f7e5 EB	184	crypto_cipher_decrypt_one(tctx->fallback.cip, out, in);
9fe757b0	185	return;
cd7c3bfe	186	}
9fe757b0	187
4549f7e5 EB	188	geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL,
4549f7e5 EB	189	AES_MODE_ECB, AES_DIR_DECRYPT);
9fe757b0 JC	190	}
9fe757b0 JC	191
cd7c3bfe SS	192	static int fallback_init_cip(struct crypto_tfm *tfm)
cd7c3bfe SS	193	{
d207a38c	194	const char *name = crypto_tfm_alg_name(tfm);
4549f7e5	195	struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
cd7c3bfe	196
4549f7e5 EB	197	tctx->fallback.cip = crypto_alloc_cipher(name, 0,
4549f7e5 EB	198	CRYPTO_ALG_NEED_FALLBACK);
cd7c3bfe	199
4549f7e5	200	if (IS_ERR(tctx->fallback.cip)) {
cd7c3bfe	201	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
4549f7e5	202	return PTR_ERR(tctx->fallback.cip);
cd7c3bfe SS	203	}
	204
	205	return 0;
	206	}
	207
	208	static void fallback_exit_cip(struct crypto_tfm *tfm)
	209	{
4549f7e5	210	struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm);
cd7c3bfe	211
4549f7e5	212	crypto_free_cipher(tctx->fallback.cip);
cd7c3bfe	213	}
9fe757b0 JC	214
9fe757b0 JC	215	static struct crypto_alg geode_alg = {
cd7c3bfe SS	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,
b9d865e3	224	.cra_blocksize = AES_BLOCK_SIZE,
4549f7e5	225	.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx),
cd7c3bfe	226	.cra_module = THIS_MODULE,
cd7c3bfe SS	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_decrypt
9fe757b0 JC	234	}
	235	}
	236	};
	237
4549f7e5	238	static int geode_init_skcipher(struct crypto_skcipher *tfm)
9fe757b0	239	{
4549f7e5 EB	240	const char *name = crypto_tfm_alg_name(&tfm->base);
4549f7e5 EB	241	struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
cd7c3bfe	242
4549f7e5 EB	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);
9fe757b0 JC	249	}
9fe757b0 JC	250
4549f7e5 EB	251	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
	252	crypto_skcipher_reqsize(tctx->fallback.skcipher));
	253	return 0;
9fe757b0 JC	254	}
9fe757b0 JC	255
4549f7e5	256	static void geode_exit_skcipher(struct crypto_skcipher *tfm)
9fe757b0	257	{
4549f7e5	258	struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm);
9fe757b0	259
4549f7e5 EB	260	crypto_free_skcipher(tctx->fallback.skcipher);
4549f7e5 EB	261	}
cd7c3bfe	262
4549f7e5 EB	263	static 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	else
	279	return crypto_skcipher_encrypt(subreq);
	280	}
9fe757b0	281
4549f7e5	282	err = skcipher_walk_virt(&walk, req, false);
9fe757b0	283
4549f7e5 EB	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);
9fe757b0 JC	289	}
	290
	291	return err;
	292	}
	293
4549f7e5	294	static int geode_cbc_encrypt(struct skcipher_request *req)
cd7c3bfe	295	{
4549f7e5	296	return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT);
cd7c3bfe SS	297	}
cd7c3bfe SS	298
4549f7e5	299	static int geode_cbc_decrypt(struct skcipher_request *req)
cd7c3bfe	300	{
4549f7e5	301	return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT);
cd7c3bfe SS	302	}
cd7c3bfe SS	303
4549f7e5	304	static int geode_ecb_encrypt(struct skcipher_request *req)
9fe757b0	305	{
4549f7e5	306	return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT);
9fe757b0 JC	307	}
9fe757b0 JC	308
4549f7e5	309	static int geode_ecb_decrypt(struct skcipher_request *req)
9fe757b0	310	{
4549f7e5	311	return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT);
9fe757b0 JC	312	}
9fe757b0 JC	313
4549f7e5 EB	314	static 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	},
9fe757b0 JC	351	};
9fe757b0 JC	352
49cfe4db	353	static void geode_aes_remove(struct pci_dev *dev)
9fe757b0 JC	354	{
9fe757b0 JC	355	crypto_unregister_alg(&geode_alg);
4549f7e5 EB	356	crypto_unregister_skciphers(geode_skcipher_algs,
4549f7e5 EB	357	ARRAY_SIZE(geode_skcipher_algs));
9fe757b0 JC	358
	359	pci_iounmap(dev, _iobase);
	360	_iobase = NULL;
	361
	362	pci_release_regions(dev);
	363	pci_disable_device(dev);
	364	}
	365
	366
49cfe4db	367	static int geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
9fe757b0 JC	368	{
9fe757b0 JC	369	int ret;
24086e3d	370
99700716 CC	371	ret = pci_enable_device(dev);
99700716 CC	372	if (ret)
9fe757b0 JC	373	return ret;
9fe757b0 JC	374
99700716 CC	375	ret = pci_request_regions(dev, "geode-aes");
99700716 CC	376	if (ret)
9fe757b0 JC	377	goto eenable;
	378
	379	_iobase = pci_iomap(dev, 0, 0);
	380
	381	if (_iobase == NULL) {
	382	ret = -ENOMEM;
	383	goto erequest;
	384	}
	385
9fe757b0 JC	386	/* Clear any pending activity */
	387	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
	388
99700716 CC	389	ret = crypto_register_alg(&geode_alg);
99700716 CC	390	if (ret)
9fe757b0 JC	391	goto eiomap;
9fe757b0 JC	392
4549f7e5 EB	393	ret = crypto_register_skciphers(geode_skcipher_algs,
4549f7e5 EB	394	ARRAY_SIZE(geode_skcipher_algs));
99700716	395	if (ret)
9fe757b0 JC	396	goto ealg;
9fe757b0 JC	397
701bcbc1	398	dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
9fe757b0 JC	399	return 0;
9fe757b0 JC	400
9fe757b0 JC	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
701bcbc1	413	dev_err(&dev->dev, "GEODE AES initialization failed.\n");
9fe757b0 JC	414	return ret;
	415	}
	416
	417	static struct pci_device_id geode_aes_tbl[] = {
24086e3d	418	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
9fe757b0 JC	419	{ 0, }
	420	};
	421
	422	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
	423
	424	static struct pci_driver geode_aes_driver = {
	425	.name = "Geode LX AES",
	426	.id_table = geode_aes_tbl,
	427	.probe = geode_aes_probe,
49cfe4db	428	.remove = geode_aes_remove,
9fe757b0 JC	429	};
9fe757b0 JC	430
49d30d3d	431	module_pci_driver(geode_aes_driver);
9fe757b0 JC	432
	433	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	434	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	435	MODULE_LICENSE("GPL");
0eb76ba2	436	MODULE_IMPORT_NS(CRYPTO_INTERNAL);