[linux-2.6-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 <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, void *value)
{
	int i;

	for (i = 0; i < 4; i++)
		iowrite32(((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(void *src, void *dst, int len, u32 flags)
{
	u32 status;
	u32 counter = AES_OP_TIMEOUT;

	iowrite32(virt_to_phys(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 unsigned int
geode_aes_crypt(struct geode_aes_op *op)
{
	u32 flags = 0;
	unsigned long iflags;
	int ret;

	if (op->len == 0)
		return 0;

	/* 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 (op->dir == AES_DIR_ENCRYPT)
		flags |= AES_CTRL_ENCRYPT;

	/* Start the critical section */

	spin_lock_irqsave(&lock, iflags);

	if (op->mode == AES_MODE_CBC) {
		flags |= AES_CTRL_CBC;
		_writefield(AES_WRITEIV0_REG, op->iv);
	}

	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
		flags |= AES_CTRL_WRKEY;
		_writefield(AES_WRITEKEY0_REG, op->key);
	}

	ret = do_crypt(op->src, op->dst, op->len, flags);
	BUG_ON(ret);

	if (op->mode == AES_MODE_CBC)
		_readfield(AES_WRITEIV0_REG, op->iv);

	spin_unlock_irqrestore(&lock, iflags);

	return op->len;
}

/* CRYPTO-API Functions */

static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
		unsigned int len)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	unsigned int ret;

	op->keylen = len;

	if (len == AES_KEYSIZE_128) {
		memcpy(op->key, key, len);
		return 0;
	}

	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
		/* not supported at all */
		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
		return -EINVAL;
	}

	/*
	 * The requested key size is not supported by HW, do a fallback
	 */
	op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	op->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);

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

static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
		unsigned int len)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	unsigned int ret;

	op->keylen = len;

	if (len == AES_KEYSIZE_128) {
		memcpy(op->key, key, len);
		return 0;
	}

	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
		/* not supported at all */
		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
		return -EINVAL;
	}

	/*
	 * The requested key size is not supported by HW, do a fallback
	 */
	op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);

	ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
	if (ret) {
		tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
		tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
	}
	return ret;
}

static int fallback_blk_dec(struct blkcipher_desc *desc,
		struct scatterlist *dst, struct scatterlist *src,
		unsigned int nbytes)
{
	unsigned int ret;
	struct crypto_blkcipher *tfm;
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);

	tfm = desc->tfm;
	desc->tfm = op->fallback.blk;

	ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);

	desc->tfm = tfm;
	return ret;
}
static int fallback_blk_enc(struct blkcipher_desc *desc,
		struct scatterlist *dst, struct scatterlist *src,
		unsigned int nbytes)
{
	unsigned int ret;
	struct crypto_blkcipher *tfm;
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);

	tfm = desc->tfm;
	desc->tfm = op->fallback.blk;

	ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);

	desc->tfm = tfm;
	return ret;
}

static void
geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
		crypto_cipher_encrypt_one(op->fallback.cip, out, in);
		return;
	}

	op->src = (void *) in;
	op->dst = (void *) out;
	op->mode = AES_MODE_ECB;
	op->flags = 0;
	op->len = AES_BLOCK_SIZE;
	op->dir = AES_DIR_ENCRYPT;

	geode_aes_crypt(op);
}


static void
geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
		crypto_cipher_decrypt_one(op->fallback.cip, out, in);
		return;
	}

	op->src = (void *) in;
	op->dst = (void *) out;
	op->mode = AES_MODE_ECB;
	op->flags = 0;
	op->len = AES_BLOCK_SIZE;
	op->dir = AES_DIR_DECRYPT;

	geode_aes_crypt(op);
}

static int fallback_init_cip(struct crypto_tfm *tfm)
{
	const char *name = crypto_tfm_alg_name(tfm);
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	op->fallback.cip = crypto_alloc_cipher(name, 0,
					       CRYPTO_ALG_NEED_FALLBACK);

	if (IS_ERR(op->fallback.cip)) {
		printk(KERN_ERR "Error allocating fallback algo %s\n", name);
		return PTR_ERR(op->fallback.cip);
	}

	return 0;
}

static void fallback_exit_cip(struct crypto_tfm *tfm)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	crypto_free_cipher(op->fallback.cip);
	op->fallback.cip = NULL;
}

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_op),
	.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_cbc_decrypt(struct blkcipher_desc *desc,
		  struct scatterlist *dst, struct scatterlist *src,
		  unsigned int nbytes)
{
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	int err, ret;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_dec(desc, dst, src, nbytes);

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);
	op->iv = walk.iv;

	while ((nbytes = walk.nbytes)) {
		op->src = walk.src.virt.addr,
		op->dst = walk.dst.virt.addr;
		op->mode = AES_MODE_CBC;
		op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
		op->dir = AES_DIR_DECRYPT;

		ret = geode_aes_crypt(op);

		nbytes -= ret;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	return err;
}

static int
geode_cbc_encrypt(struct blkcipher_desc *desc,
		  struct scatterlist *dst, struct scatterlist *src,
		  unsigned int nbytes)
{
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	int err, ret;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_enc(desc, dst, src, nbytes);

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);
	op->iv = walk.iv;

	while ((nbytes = walk.nbytes)) {
		op->src = walk.src.virt.addr,
		op->dst = walk.dst.virt.addr;
		op->mode = AES_MODE_CBC;
		op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
		op->dir = AES_DIR_ENCRYPT;

		ret = geode_aes_crypt(op);
		nbytes -= ret;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	return err;
}

static int fallback_init_blk(struct crypto_tfm *tfm)
{
	const char *name = crypto_tfm_alg_name(tfm);
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	op->fallback.blk = crypto_alloc_blkcipher(name, 0,
			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);

	if (IS_ERR(op->fallback.blk)) {
		printk(KERN_ERR "Error allocating fallback algo %s\n", name);
		return PTR_ERR(op->fallback.blk);
	}

	return 0;
}

static void fallback_exit_blk(struct crypto_tfm *tfm)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	crypto_free_blkcipher(op->fallback.blk);
	op->fallback.blk = NULL;
}

static struct crypto_alg geode_cbc_alg = {
	.cra_name		=	"cbc(aes)",
	.cra_driver_name	=	"cbc-aes-geode",
	.cra_priority		=	400,
	.cra_flags			=	CRYPTO_ALG_TYPE_BLKCIPHER |
						CRYPTO_ALG_KERN_DRIVER_ONLY |
						CRYPTO_ALG_NEED_FALLBACK,
	.cra_init			=	fallback_init_blk,
	.cra_exit			=	fallback_exit_blk,
	.cra_blocksize		=	AES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_alignmask		=	15,
	.cra_type			=	&crypto_blkcipher_type,
	.cra_module			=	THIS_MODULE,
	.cra_u				=	{
		.blkcipher	=	{
			.min_keysize	=	AES_MIN_KEY_SIZE,
			.max_keysize	=	AES_MAX_KEY_SIZE,
			.setkey			=	geode_setkey_blk,
			.encrypt		=	geode_cbc_encrypt,
			.decrypt		=	geode_cbc_decrypt,
			.ivsize			=	AES_BLOCK_SIZE,
		}
	}
};

static int
geode_ecb_decrypt(struct blkcipher_desc *desc,
		  struct scatterlist *dst, struct scatterlist *src,
		  unsigned int nbytes)
{
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	int err, ret;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_dec(desc, dst, src, nbytes);

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	while ((nbytes = walk.nbytes)) {
		op->src = walk.src.virt.addr,
		op->dst = walk.dst.virt.addr;
		op->mode = AES_MODE_ECB;
		op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
		op->dir = AES_DIR_DECRYPT;

		ret = geode_aes_crypt(op);
		nbytes -= ret;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}

	return err;
}

static int
geode_ecb_encrypt(struct blkcipher_desc *desc,
		  struct scatterlist *dst, struct scatterlist *src,
		  unsigned int nbytes)
{
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	int err, ret;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_enc(desc, dst, src, nbytes);

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	while ((nbytes = walk.nbytes)) {
		op->src = walk.src.virt.addr,
		op->dst = walk.dst.virt.addr;
		op->mode = AES_MODE_ECB;
		op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
		op->dir = AES_DIR_ENCRYPT;

		ret = geode_aes_crypt(op);
		nbytes -= ret;
		ret =  blkcipher_walk_done(desc, &walk, nbytes);
	}

	return err;
}

static struct crypto_alg geode_ecb_alg = {
	.cra_name			=	"ecb(aes)",
	.cra_driver_name	=	"ecb-aes-geode",
	.cra_priority		=	400,
	.cra_flags			=	CRYPTO_ALG_TYPE_BLKCIPHER |
						CRYPTO_ALG_KERN_DRIVER_ONLY |
						CRYPTO_ALG_NEED_FALLBACK,
	.cra_init			=	fallback_init_blk,
	.cra_exit			=	fallback_exit_blk,
	.cra_blocksize		=	AES_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_alignmask		=	15,
	.cra_type			=	&crypto_blkcipher_type,
	.cra_module			=	THIS_MODULE,
	.cra_u				=	{
		.blkcipher	=	{
			.min_keysize	=	AES_MIN_KEY_SIZE,
			.max_keysize	=	AES_MAX_KEY_SIZE,
			.setkey			=	geode_setkey_blk,
			.encrypt		=	geode_ecb_encrypt,
			.decrypt		=	geode_ecb_decrypt,
		}
	}
};

static void geode_aes_remove(struct pci_dev *dev)
{
	crypto_unregister_alg(&geode_alg);
	crypto_unregister_alg(&geode_ecb_alg);
	crypto_unregister_alg(&geode_cbc_alg);

	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_alg(&geode_ecb_alg);
	if (ret)
		goto ealg;

	ret = crypto_register_alg(&geode_cbc_alg);
	if (ret)
		goto eecb;

	dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
	return 0;

 eecb:
	crypto_unregister_alg(&geode_ecb_alg);

 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>
9fe757b0	13
99700716 CC	14	#include <linux/io.h>
99700716 CC	15	#include <linux/delay.h>
9fe757b0 JC	16
	17	#include "geode-aes.h"
	18
9fe757b0 JC	19	/* Static structures */
9fe757b0 JC	20
99700716	21	static void __iomem *_iobase;
9fe757b0 JC	22	static spinlock_t lock;
	23
	24	/* Write a 128 bit field (either a writable key or IV) */
	25	static inline void
	26	_writefield(u32 offset, void *value)
	27	{
	28	int i;
24086e3d	29
99700716	30	for (i = 0; i < 4; i++)
9fe757b0 JC	31	iowrite32(((u32 ) value)[i], _iobase + offset + (i 4));
	32	}
	33
	34	/* Read a 128 bit field (either a writable key or IV) */
	35	static inline void
	36	_readfield(u32 offset, void *value)
	37	{
	38	int i;
24086e3d	39
99700716	40	for (i = 0; i < 4; i++)
9fe757b0 JC	41	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	42	}
	43
	44	static int
	45	do_crypt(void src, void dst, int len, u32 flags)
	46	{
	47	u32 status;
	48	u32 counter = AES_OP_TIMEOUT;
	49
	50	iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
	51	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
	52	iowrite32(len, _iobase + AES_LENA_REG);
	53
	54	/* Start the operation */
	55	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
	56
1f4e4773	57	do {
9fe757b0	58	status = ioread32(_iobase + AES_INTR_REG);
1f4e4773	59	cpu_relax();
99700716	60	} while (!(status & AES_INTRA_PENDING) && --counter);
9fe757b0 JC	61
	62	/* Clear the event */
	63	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
	64	return counter ? 0 : 1;
	65	}
	66
ab782705	67	static unsigned int
9fe757b0 JC	68	geode_aes_crypt(struct geode_aes_op *op)
9fe757b0 JC	69	{
9fe757b0	70	u32 flags = 0;
5efee174	71	unsigned long iflags;
1f4e4773	72	int ret;
9fe757b0	73
761e7846	74	if (op->len == 0)
9fe757b0 JC	75	return 0;
9fe757b0 JC	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 JC	83
	84	if (op->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 (op->mode == AES_MODE_CBC) {
	92	flags \|= AES_CTRL_CBC;
	93	_writefield(AES_WRITEIV0_REG, op->iv);
	94	}
	95
761e7846	96	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
9fe757b0 JC	97	flags \|= AES_CTRL_WRKEY;
	98	_writefield(AES_WRITEKEY0_REG, op->key);
	99	}
	100
1f4e4773 SS	101	ret = do_crypt(op->src, op->dst, op->len, flags);
1f4e4773 SS	102	BUG_ON(ret);
9fe757b0 JC	103
	104	if (op->mode == AES_MODE_CBC)
	105	_readfield(AES_WRITEIV0_REG, op->iv);
	106
	107	spin_unlock_irqrestore(&lock, iflags);
	108
	109	return op->len;
	110	}
	111
	112	/* CRYPTO-API Functions */
	113
cd7c3bfe SS	114	static int geode_setkey_cip(struct crypto_tfm tfm, const u8 key,
cd7c3bfe SS	115	unsigned int len)
9fe757b0 JC	116	{
9fe757b0 JC	117	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
cd7c3bfe SS	118	unsigned int ret;
	119
	120	op->keylen = len;
	121
	122	if (len == AES_KEYSIZE_128) {
	123	memcpy(op->key, key, len);
	124	return 0;
	125	}
9fe757b0	126
cd7c3bfe SS	127	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
cd7c3bfe SS	128	/* not supported at all */
9fe757b0 JC	129	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	130	return -EINVAL;
	131	}
	132
cd7c3bfe SS	133	/*
	134	* The requested key size is not supported by HW, do a fallback
	135	*/
faad98f2 RK	136	op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
faad98f2 RK	137	op->fallback.cip->base.crt_flags \|= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
cd7c3bfe SS	138
	139	ret = crypto_cipher_setkey(op->fallback.cip, key, len);
	140	if (ret) {
	141	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
e054f164	142	tfm->crt_flags \|= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
cd7c3bfe SS	143	}
	144	return ret;
	145	}
	146
	147	static int geode_setkey_blk(struct crypto_tfm tfm, const u8 key,
	148	unsigned int len)
	149	{
	150	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	151	unsigned int ret;
	152
	153	op->keylen = len;
	154
	155	if (len == AES_KEYSIZE_128) {
	156	memcpy(op->key, key, len);
	157	return 0;
	158	}
	159
	160	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
	161	/* not supported at all */
	162	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	163	return -EINVAL;
	164	}
	165
	166	/*
	167	* The requested key size is not supported by HW, do a fallback
	168	*/
	169	op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	170	op->fallback.blk->base.crt_flags \|= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
	171
	172	ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
	173	if (ret) {
	174	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
	175	tfm->crt_flags \|= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
	176	}
	177	return ret;
	178	}
	179
	180	static int fallback_blk_dec(struct blkcipher_desc *desc,
	181	struct scatterlist dst, struct scatterlist src,
	182	unsigned int nbytes)
	183	{
	184	unsigned int ret;
	185	struct crypto_blkcipher *tfm;
	186	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	187
	188	tfm = desc->tfm;
	189	desc->tfm = op->fallback.blk;
	190
fdc520aa	191	ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
cd7c3bfe SS	192
	193	desc->tfm = tfm;
	194	return ret;
	195	}
	196	static int fallback_blk_enc(struct blkcipher_desc *desc,
	197	struct scatterlist dst, struct scatterlist src,
	198	unsigned int nbytes)
	199	{
	200	unsigned int ret;
	201	struct crypto_blkcipher *tfm;
	202	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	203
	204	tfm = desc->tfm;
	205	desc->tfm = op->fallback.blk;
	206
fdc520aa	207	ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
cd7c3bfe SS	208
	209	desc->tfm = tfm;
	210	return ret;
9fe757b0 JC	211	}
	212
	213	static void
	214	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	215	{
	216	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	217
cd7c3bfe SS	218	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
cd7c3bfe SS	219	crypto_cipher_encrypt_one(op->fallback.cip, out, in);
9fe757b0	220	return;
cd7c3bfe	221	}
9fe757b0 JC	222
	223	op->src = (void *) in;
	224	op->dst = (void *) out;
	225	op->mode = AES_MODE_ECB;
	226	op->flags = 0;
b9d865e3	227	op->len = AES_BLOCK_SIZE;
9fe757b0 JC	228	op->dir = AES_DIR_ENCRYPT;
	229
	230	geode_aes_crypt(op);
	231	}
	232
	233
	234	static void
	235	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	236	{
	237	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	238
cd7c3bfe SS	239	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
cd7c3bfe SS	240	crypto_cipher_decrypt_one(op->fallback.cip, out, in);
9fe757b0	241	return;
cd7c3bfe	242	}
9fe757b0 JC	243
	244	op->src = (void *) in;
	245	op->dst = (void *) out;
	246	op->mode = AES_MODE_ECB;
	247	op->flags = 0;
b9d865e3	248	op->len = AES_BLOCK_SIZE;
9fe757b0 JC	249	op->dir = AES_DIR_DECRYPT;
	250
	251	geode_aes_crypt(op);
	252	}
	253
cd7c3bfe SS	254	static int fallback_init_cip(struct crypto_tfm *tfm)
cd7c3bfe SS	255	{
d207a38c	256	const char *name = crypto_tfm_alg_name(tfm);
cd7c3bfe SS	257	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	258
	259	op->fallback.cip = crypto_alloc_cipher(name, 0,
1ad0f160	260	CRYPTO_ALG_NEED_FALLBACK);
cd7c3bfe SS	261
	262	if (IS_ERR(op->fallback.cip)) {
	263	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
faad98f2	264	return PTR_ERR(op->fallback.cip);
cd7c3bfe SS	265	}
	266
	267	return 0;
	268	}
	269
	270	static void fallback_exit_cip(struct crypto_tfm *tfm)
	271	{
	272	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	273
	274	crypto_free_cipher(op->fallback.cip);
	275	op->fallback.cip = NULL;
	276	}
9fe757b0 JC	277
9fe757b0 JC	278	static struct crypto_alg geode_alg = {
cd7c3bfe SS	279	.cra_name = "aes",
	280	.cra_driver_name = "geode-aes",
	281	.cra_priority = 300,
	282	.cra_alignmask = 15,
	283	.cra_flags = CRYPTO_ALG_TYPE_CIPHER \|
	284	CRYPTO_ALG_NEED_FALLBACK,
	285	.cra_init = fallback_init_cip,
	286	.cra_exit = fallback_exit_cip,
b9d865e3	287	.cra_blocksize = AES_BLOCK_SIZE,
9fe757b0	288	.cra_ctxsize = sizeof(struct geode_aes_op),
cd7c3bfe	289	.cra_module = THIS_MODULE,
cd7c3bfe SS	290	.cra_u = {
	291	.cipher = {
	292	.cia_min_keysize = AES_MIN_KEY_SIZE,
	293	.cia_max_keysize = AES_MAX_KEY_SIZE,
	294	.cia_setkey = geode_setkey_cip,
	295	.cia_encrypt = geode_encrypt,
	296	.cia_decrypt = geode_decrypt
9fe757b0 JC	297	}
	298	}
	299	};
	300
	301	static int
	302	geode_cbc_decrypt(struct blkcipher_desc *desc,
	303	struct scatterlist dst, struct scatterlist src,
	304	unsigned int nbytes)
	305	{
	306	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	307	struct blkcipher_walk walk;
	308	int err, ret;
	309
cd7c3bfe SS	310	if (unlikely(op->keylen != AES_KEYSIZE_128))
	311	return fallback_blk_dec(desc, dst, src, nbytes);
	312
9fe757b0 JC	313	blkcipher_walk_init(&walk, dst, src, nbytes);
9fe757b0 JC	314	err = blkcipher_walk_virt(desc, &walk);
d2456c66	315	op->iv = walk.iv;
9fe757b0	316
99700716	317	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	318	op->src = walk.src.virt.addr,
	319	op->dst = walk.dst.virt.addr;
	320	op->mode = AES_MODE_CBC;
b9d865e3	321	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	322	op->dir = AES_DIR_DECRYPT;
9fe757b0 JC	323
9fe757b0 JC	324	ret = geode_aes_crypt(op);
9fe757b0 JC	325
9fe757b0	326	nbytes -= ret;
9fe757b0 JC	327	err = blkcipher_walk_done(desc, &walk, nbytes);
	328	}
	329
	330	return err;
	331	}
	332
	333	static int
	334	geode_cbc_encrypt(struct blkcipher_desc *desc,
	335	struct scatterlist dst, struct scatterlist src,
	336	unsigned int nbytes)
	337	{
	338	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	339	struct blkcipher_walk walk;
	340	int err, ret;
	341
cd7c3bfe SS	342	if (unlikely(op->keylen != AES_KEYSIZE_128))
	343	return fallback_blk_enc(desc, dst, src, nbytes);
	344
9fe757b0 JC	345	blkcipher_walk_init(&walk, dst, src, nbytes);
9fe757b0 JC	346	err = blkcipher_walk_virt(desc, &walk);
d2456c66	347	op->iv = walk.iv;
9fe757b0	348
99700716	349	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	350	op->src = walk.src.virt.addr,
	351	op->dst = walk.dst.virt.addr;
	352	op->mode = AES_MODE_CBC;
b9d865e3	353	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	354	op->dir = AES_DIR_ENCRYPT;
9fe757b0 JC	355
9fe757b0 JC	356	ret = geode_aes_crypt(op);
	357	nbytes -= ret;
	358	err = blkcipher_walk_done(desc, &walk, nbytes);
	359	}
	360
	361	return err;
	362	}
	363
cd7c3bfe SS	364	static int fallback_init_blk(struct crypto_tfm *tfm)
cd7c3bfe SS	365	{
d207a38c	366	const char *name = crypto_tfm_alg_name(tfm);
cd7c3bfe SS	367	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	368
	369	op->fallback.blk = crypto_alloc_blkcipher(name, 0,
	370	CRYPTO_ALG_ASYNC \| CRYPTO_ALG_NEED_FALLBACK);
	371
	372	if (IS_ERR(op->fallback.blk)) {
	373	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
	374	return PTR_ERR(op->fallback.blk);
	375	}
	376
	377	return 0;
	378	}
	379
	380	static void fallback_exit_blk(struct crypto_tfm *tfm)
	381	{
	382	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	383
	384	crypto_free_blkcipher(op->fallback.blk);
	385	op->fallback.blk = NULL;
	386	}
	387
9fe757b0 JC	388	static struct crypto_alg geode_cbc_alg = {
9fe757b0 JC	389	.cra_name = "cbc(aes)",
cd7c3bfe	390	.cra_driver_name = "cbc-aes-geode",
9fe757b0	391	.cra_priority = 400,
cd7c3bfe	392	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
d912bb76 NM	393	CRYPTO_ALG_KERN_DRIVER_ONLY \|
d912bb76 NM	394	CRYPTO_ALG_NEED_FALLBACK,
cd7c3bfe SS	395	.cra_init = fallback_init_blk,
cd7c3bfe SS	396	.cra_exit = fallback_exit_blk,
b9d865e3	397	.cra_blocksize = AES_BLOCK_SIZE,
9fe757b0 JC	398	.cra_ctxsize = sizeof(struct geode_aes_op),
9fe757b0 JC	399	.cra_alignmask = 15,
cd7c3bfe SS	400	.cra_type = &crypto_blkcipher_type,
cd7c3bfe SS	401	.cra_module = THIS_MODULE,
cd7c3bfe SS	402	.cra_u = {
	403	.blkcipher = {
	404	.min_keysize = AES_MIN_KEY_SIZE,
	405	.max_keysize = AES_MAX_KEY_SIZE,
	406	.setkey = geode_setkey_blk,
9fe757b0 JC	407	.encrypt = geode_cbc_encrypt,
9fe757b0 JC	408	.decrypt = geode_cbc_decrypt,
bac79a2a	409	.ivsize = AES_BLOCK_SIZE,
9fe757b0 JC	410	}
	411	}
	412	};
	413
	414	static int
	415	geode_ecb_decrypt(struct blkcipher_desc *desc,
	416	struct scatterlist dst, struct scatterlist src,
	417	unsigned int nbytes)
	418	{
	419	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	420	struct blkcipher_walk walk;
	421	int err, ret;
	422
cd7c3bfe SS	423	if (unlikely(op->keylen != AES_KEYSIZE_128))
	424	return fallback_blk_dec(desc, dst, src, nbytes);
	425
9fe757b0 JC	426	blkcipher_walk_init(&walk, dst, src, nbytes);
	427	err = blkcipher_walk_virt(desc, &walk);
	428
99700716	429	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	430	op->src = walk.src.virt.addr,
	431	op->dst = walk.dst.virt.addr;
	432	op->mode = AES_MODE_ECB;
b9d865e3	433	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	434	op->dir = AES_DIR_DECRYPT;
	435
	436	ret = geode_aes_crypt(op);
	437	nbytes -= ret;
	438	err = blkcipher_walk_done(desc, &walk, nbytes);
	439	}
	440
	441	return err;
	442	}
	443
	444	static int
	445	geode_ecb_encrypt(struct blkcipher_desc *desc,
	446	struct scatterlist dst, struct scatterlist src,
	447	unsigned int nbytes)
	448	{
	449	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	450	struct blkcipher_walk walk;
	451	int err, ret;
	452
cd7c3bfe SS	453	if (unlikely(op->keylen != AES_KEYSIZE_128))
	454	return fallback_blk_enc(desc, dst, src, nbytes);
	455
9fe757b0 JC	456	blkcipher_walk_init(&walk, dst, src, nbytes);
	457	err = blkcipher_walk_virt(desc, &walk);
	458
99700716	459	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	460	op->src = walk.src.virt.addr,
	461	op->dst = walk.dst.virt.addr;
	462	op->mode = AES_MODE_ECB;
b9d865e3	463	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	464	op->dir = AES_DIR_ENCRYPT;
	465
	466	ret = geode_aes_crypt(op);
	467	nbytes -= ret;
	468	ret = blkcipher_walk_done(desc, &walk, nbytes);
	469	}
	470
	471	return err;
	472	}
	473
	474	static struct crypto_alg geode_ecb_alg = {
cd7c3bfe SS	475	.cra_name = "ecb(aes)",
cd7c3bfe SS	476	.cra_driver_name = "ecb-aes-geode",
9fe757b0	477	.cra_priority = 400,
cd7c3bfe	478	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
d912bb76 NM	479	CRYPTO_ALG_KERN_DRIVER_ONLY \|
d912bb76 NM	480	CRYPTO_ALG_NEED_FALLBACK,
cd7c3bfe SS	481	.cra_init = fallback_init_blk,
cd7c3bfe SS	482	.cra_exit = fallback_exit_blk,
b9d865e3	483	.cra_blocksize = AES_BLOCK_SIZE,
9fe757b0 JC	484	.cra_ctxsize = sizeof(struct geode_aes_op),
9fe757b0 JC	485	.cra_alignmask = 15,
cd7c3bfe SS	486	.cra_type = &crypto_blkcipher_type,
cd7c3bfe SS	487	.cra_module = THIS_MODULE,
cd7c3bfe SS	488	.cra_u = {
	489	.blkcipher = {
	490	.min_keysize = AES_MIN_KEY_SIZE,
	491	.max_keysize = AES_MAX_KEY_SIZE,
	492	.setkey = geode_setkey_blk,
9fe757b0 JC	493	.encrypt = geode_ecb_encrypt,
	494	.decrypt = geode_ecb_decrypt,
	495	}
	496	}
	497	};
	498
49cfe4db	499	static void geode_aes_remove(struct pci_dev *dev)
9fe757b0 JC	500	{
	501	crypto_unregister_alg(&geode_alg);
	502	crypto_unregister_alg(&geode_ecb_alg);
	503	crypto_unregister_alg(&geode_cbc_alg);
	504
	505	pci_iounmap(dev, _iobase);
	506	_iobase = NULL;
	507
	508	pci_release_regions(dev);
	509	pci_disable_device(dev);
	510	}
	511
	512
49cfe4db	513	static int geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
9fe757b0 JC	514	{
9fe757b0 JC	515	int ret;
24086e3d	516
99700716 CC	517	ret = pci_enable_device(dev);
99700716 CC	518	if (ret)
9fe757b0 JC	519	return ret;
9fe757b0 JC	520
99700716 CC	521	ret = pci_request_regions(dev, "geode-aes");
99700716 CC	522	if (ret)
9fe757b0 JC	523	goto eenable;
	524
	525	_iobase = pci_iomap(dev, 0, 0);
	526
	527	if (_iobase == NULL) {
	528	ret = -ENOMEM;
	529	goto erequest;
	530	}
	531
	532	spin_lock_init(&lock);
	533
	534	/* Clear any pending activity */
	535	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
	536
99700716 CC	537	ret = crypto_register_alg(&geode_alg);
99700716 CC	538	if (ret)
9fe757b0 JC	539	goto eiomap;
9fe757b0 JC	540
99700716 CC	541	ret = crypto_register_alg(&geode_ecb_alg);
99700716 CC	542	if (ret)
9fe757b0 JC	543	goto ealg;
9fe757b0 JC	544
99700716 CC	545	ret = crypto_register_alg(&geode_cbc_alg);
99700716 CC	546	if (ret)
9fe757b0 JC	547	goto eecb;
9fe757b0 JC	548
701bcbc1	549	dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
9fe757b0 JC	550	return 0;
	551
	552	eecb:
	553	crypto_unregister_alg(&geode_ecb_alg);
	554
	555	ealg:
	556	crypto_unregister_alg(&geode_alg);
	557
	558	eiomap:
	559	pci_iounmap(dev, _iobase);
	560
	561	erequest:
	562	pci_release_regions(dev);
	563
	564	eenable:
	565	pci_disable_device(dev);
	566
701bcbc1	567	dev_err(&dev->dev, "GEODE AES initialization failed.\n");
9fe757b0 JC	568	return ret;
	569	}
	570
	571	static struct pci_device_id geode_aes_tbl[] = {
24086e3d	572	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
9fe757b0 JC	573	{ 0, }
	574	};
	575
	576	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
	577
	578	static struct pci_driver geode_aes_driver = {
	579	.name = "Geode LX AES",
	580	.id_table = geode_aes_tbl,
	581	.probe = geode_aes_probe,
49cfe4db	582	.remove = geode_aes_remove,
9fe757b0 JC	583	};
9fe757b0 JC	584
49d30d3d	585	module_pci_driver(geode_aes_driver);
9fe757b0 JC	586
	587	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	588	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	589	MODULE_LICENSE("GPL");