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

 /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#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 <asm/io.h>
#include <asm/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(struct crypto_tfm *tfm, const u8 *key, unsigned int len)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	if (len != AES_KEY_LENGTH) {
		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
		return -EINVAL;
	}

	memcpy(op->key, key, len);
	return 0;
}

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

	if ((out == NULL) || (in == NULL))
		return;

	op->src = (void *) in;
	op->dst = (void *) out;
	op->mode = AES_MODE_ECB;
	op->flags = 0;
	op->len = AES_MIN_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 ((out == NULL) || (in == NULL))
		return;

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

	geode_aes_crypt(op);
}


static struct crypto_alg geode_alg = {
	.cra_name               =       "aes",
	.cra_driver_name	=       "geode-aes-128",
	.cra_priority           =       300,
	.cra_alignmask          =       15,
	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		=	AES_MIN_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(geode_alg.cra_list),
	.cra_u			=	{
		.cipher = {
			.cia_min_keysize	=  AES_KEY_LENGTH,
			.cia_max_keysize	=  AES_KEY_LENGTH,
			.cia_setkey		=  geode_setkey,
			.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;

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

	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_MIN_BLOCK_SIZE);
		op->dir = AES_DIR_DECRYPT;

		ret = geode_aes_crypt(op);

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

	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
	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;

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

	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_MIN_BLOCK_SIZE);
		op->dir = AES_DIR_ENCRYPT;

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

	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
	return err;
}

static struct crypto_alg geode_cbc_alg = {
	.cra_name		=	"cbc(aes)",
	.cra_driver_name	=	"cbc-aes-geode-128",
	.cra_priority		=	400,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	AES_MIN_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_alignmask		=	15,
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(geode_cbc_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	AES_KEY_LENGTH,
			.max_keysize		=	AES_KEY_LENGTH,
			.setkey			=	geode_setkey,
			.encrypt		=	geode_cbc_encrypt,
			.decrypt		=	geode_cbc_decrypt,
			.ivsize			=	AES_IV_LENGTH,
		}
	}
};

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;

	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_MIN_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;

	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_MIN_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-128",
	.cra_priority		=	400,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	AES_MIN_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_alignmask		=	15,
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(geode_ecb_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	AES_KEY_LENGTH,
			.max_keysize		=	AES_KEY_LENGTH,
			.setkey			=	geode_setkey,
			.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;

	if ((ret = pci_enable_device(dev)))
		return ret;

	if ((ret = pci_request_regions(dev, "geode-aes-128")))
		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);

	if ((ret = crypto_register_alg(&geode_alg)))
		goto eiomap;

	if ((ret = crypto_register_alg(&geode_ecb_alg)))
		goto ealg;

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

	printk(KERN_NOTICE "geode-aes: 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);

	printk(KERN_ERR "geode-aes:  GEODE AES initialization failed.\n");
	return ret;
}

static struct pci_device_id geode_aes_tbl[] = {
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
	{ 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 = __devexit_p(geode_aes_remove)
};

static int __init
geode_aes_init(void)
{
	return pci_register_driver(&geode_aes_driver);
}

static void __exit
geode_aes_exit(void)
{
	pci_unregister_driver(&geode_aes_driver);
}

MODULE_AUTHOR("Advanced Micro Devices, Inc.");
MODULE_DESCRIPTION("Geode LX Hardware AES driver");
MODULE_LICENSE("GPL");

module_init(geode_aes_init);
module_exit(geode_aes_exit);
Commit	Line	Data
9fe757b0 JC	1	/* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2 of the License, or
	6	* (at your option) any later version.
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/kernel.h>
9fe757b0 JC	11	#include <linux/pci.h>
	12	#include <linux/pci_ids.h>
	13	#include <linux/crypto.h>
	14	#include <linux/spinlock.h>
	15	#include <crypto/algapi.h>
89e12654	16	#include <crypto/aes.h>
9fe757b0 JC	17
	18	#include <asm/io.h>
	19	#include <asm/delay.h>
	20
	21	#include "geode-aes.h"
	22
9fe757b0 JC	23	/* Static structures */
	24
	25	static void __iomem * _iobase;
	26	static spinlock_t lock;
	27
	28	/* Write a 128 bit field (either a writable key or IV) */
	29	static inline void
	30	_writefield(u32 offset, void *value)
	31	{
	32	int i;
	33	for(i = 0; i < 4; i++)
	34	iowrite32(((u32 ) value)[i], _iobase + offset + (i 4));
	35	}
	36
	37	/* Read a 128 bit field (either a writable key or IV) */
	38	static inline void
	39	_readfield(u32 offset, void *value)
	40	{
	41	int i;
	42	for(i = 0; i < 4; i++)
	43	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	44	}
	45
	46	static int
	47	do_crypt(void src, void dst, int len, u32 flags)
	48	{
	49	u32 status;
	50	u32 counter = AES_OP_TIMEOUT;
	51
	52	iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
	53	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
	54	iowrite32(len, _iobase + AES_LENA_REG);
	55
	56	/* Start the operation */
	57	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
	58
1f4e4773	59	do {
9fe757b0	60	status = ioread32(_iobase + AES_INTR_REG);
1f4e4773 SS	61	cpu_relax();
1f4e4773 SS	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
ab782705	69	static unsigned int
9fe757b0 JC	70	geode_aes_crypt(struct geode_aes_op *op)
9fe757b0 JC	71	{
9fe757b0	72	u32 flags = 0;
5efee174	73	unsigned long iflags;
1f4e4773	74	int ret;
9fe757b0	75
761e7846	76	if (op->len == 0)
9fe757b0 JC	77	return 0;
9fe757b0 JC	78
761e7846 JC	79	/* If the source and destination is the same, then
	80	* we need to turn on the coherent flags, otherwise
	81	* we don't need to worry
	82	*/
	83
2e21630d	84	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0 JC	85
	86	if (op->dir == AES_DIR_ENCRYPT)
	87	flags \|= AES_CTRL_ENCRYPT;
	88
	89	/* Start the critical section */
	90
	91	spin_lock_irqsave(&lock, iflags);
	92
	93	if (op->mode == AES_MODE_CBC) {
	94	flags \|= AES_CTRL_CBC;
	95	_writefield(AES_WRITEIV0_REG, op->iv);
	96	}
	97
761e7846	98	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
9fe757b0 JC	99	flags \|= AES_CTRL_WRKEY;
	100	_writefield(AES_WRITEKEY0_REG, op->key);
	101	}
	102
1f4e4773 SS	103	ret = do_crypt(op->src, op->dst, op->len, flags);
1f4e4773 SS	104	BUG_ON(ret);
9fe757b0 JC	105
	106	if (op->mode == AES_MODE_CBC)
	107	_readfield(AES_WRITEIV0_REG, op->iv);
	108
	109	spin_unlock_irqrestore(&lock, iflags);
	110
	111	return op->len;
	112	}
	113
	114	/* CRYPTO-API Functions */
	115
	116	static int
	117	geode_setkey(struct crypto_tfm tfm, const u8 key, unsigned int len)
	118	{
	119	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	120
	121	if (len != AES_KEY_LENGTH) {
	122	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	123	return -EINVAL;
	124	}
	125
	126	memcpy(op->key, key, len);
	127	return 0;
	128	}
	129
	130	static void
	131	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	132	{
	133	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	134
	135	if ((out == NULL) \|\| (in == NULL))
	136	return;
	137
	138	op->src = (void *) in;
	139	op->dst = (void *) out;
	140	op->mode = AES_MODE_ECB;
	141	op->flags = 0;
	142	op->len = AES_MIN_BLOCK_SIZE;
	143	op->dir = AES_DIR_ENCRYPT;
	144
	145	geode_aes_crypt(op);
	146	}
	147
	148
	149	static void
	150	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	151	{
	152	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	153
	154	if ((out == NULL) \|\| (in == NULL))
	155	return;
	156
	157	op->src = (void *) in;
	158	op->dst = (void *) out;
	159	op->mode = AES_MODE_ECB;
	160	op->flags = 0;
	161	op->len = AES_MIN_BLOCK_SIZE;
	162	op->dir = AES_DIR_DECRYPT;
	163
	164	geode_aes_crypt(op);
	165	}
	166
	167
	168	static struct crypto_alg geode_alg = {
169	.cra_name = "aes",
170	.cra_driver_name = "geode-aes-128",
171	.cra_priority = 300,
172	.cra_alignmask = 15,
173	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
174	.cra_blocksize = AES_MIN_BLOCK_SIZE,
175	.cra_ctxsize = sizeof(struct geode_aes_op),
176	.cra_module = THIS_MODULE,
177	.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
178	.cra_u = {
179	.cipher = {
180	.cia_min_keysize = AES_KEY_LENGTH,
181	.cia_max_keysize = AES_KEY_LENGTH,
182	.cia_setkey = geode_setkey,
183	.cia_encrypt = geode_encrypt,
184	.cia_decrypt = geode_decrypt
185	}
186	}
187	};
188
189	static int
190	geode_cbc_decrypt(struct blkcipher_desc *desc,
191	struct scatterlist dst, struct scatterlist src,
192	unsigned int nbytes)
193	{
194	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
195	struct blkcipher_walk walk;
196	int err, ret;
197
198	blkcipher_walk_init(&walk, dst, src, nbytes);
199	err = blkcipher_walk_virt(desc, &walk);
2d506d4f	200	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
9fe757b0 JC	201
	202	while((nbytes = walk.nbytes)) {
	203	op->src = walk.src.virt.addr,
	204	op->dst = walk.dst.virt.addr;
	205	op->mode = AES_MODE_CBC;
	206	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	207	op->dir = AES_DIR_DECRYPT;
	208
9fe757b0 JC	209	ret = geode_aes_crypt(op);
9fe757b0 JC	210
9fe757b0	211	nbytes -= ret;
9fe757b0 JC	212	err = blkcipher_walk_done(desc, &walk, nbytes);
	213	}
	214
2d506d4f	215	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
9fe757b0 JC	216	return err;
	217	}
	218
	219	static int
	220	geode_cbc_encrypt(struct blkcipher_desc *desc,
	221	struct scatterlist dst, struct scatterlist src,
	222	unsigned int nbytes)
	223	{
	224	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	225	struct blkcipher_walk walk;
	226	int err, ret;
	227
	228	blkcipher_walk_init(&walk, dst, src, nbytes);
	229	err = blkcipher_walk_virt(desc, &walk);
2d506d4f	230	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
9fe757b0 JC	231
	232	while((nbytes = walk.nbytes)) {
	233	op->src = walk.src.virt.addr,
	234	op->dst = walk.dst.virt.addr;
	235	op->mode = AES_MODE_CBC;
	236	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	237	op->dir = AES_DIR_ENCRYPT;
	238
9fe757b0 JC	239	ret = geode_aes_crypt(op);
	240	nbytes -= ret;
	241	err = blkcipher_walk_done(desc, &walk, nbytes);
	242	}
	243
2d506d4f	244	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
9fe757b0 JC	245	return err;
	246	}
	247
	248	static struct crypto_alg geode_cbc_alg = {
	249	.cra_name = "cbc(aes)",
	250	.cra_driver_name = "cbc-aes-geode-128",
	251	.cra_priority = 400,
	252	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	253	.cra_blocksize = AES_MIN_BLOCK_SIZE,
	254	.cra_ctxsize = sizeof(struct geode_aes_op),
	255	.cra_alignmask = 15,
	256	.cra_type = &crypto_blkcipher_type,
	257	.cra_module = THIS_MODULE,
	258	.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
	259	.cra_u = {
	260	.blkcipher = {
	261	.min_keysize = AES_KEY_LENGTH,
	262	.max_keysize = AES_KEY_LENGTH,
	263	.setkey = geode_setkey,
	264	.encrypt = geode_cbc_encrypt,
	265	.decrypt = geode_cbc_decrypt,
761e7846	266	.ivsize = AES_IV_LENGTH,
9fe757b0 JC	267	}
	268	}
	269	};
	270
	271	static int
	272	geode_ecb_decrypt(struct blkcipher_desc *desc,
	273	struct scatterlist dst, struct scatterlist src,
	274	unsigned int nbytes)
	275	{
	276	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	277	struct blkcipher_walk walk;
	278	int err, ret;
	279
	280	blkcipher_walk_init(&walk, dst, src, nbytes);
	281	err = blkcipher_walk_virt(desc, &walk);
	282
	283	while((nbytes = walk.nbytes)) {
	284	op->src = walk.src.virt.addr,
	285	op->dst = walk.dst.virt.addr;
	286	op->mode = AES_MODE_ECB;
	287	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	288	op->dir = AES_DIR_DECRYPT;
	289
	290	ret = geode_aes_crypt(op);
	291	nbytes -= ret;
	292	err = blkcipher_walk_done(desc, &walk, nbytes);
	293	}
	294
	295	return err;
	296	}
	297
	298	static int
	299	geode_ecb_encrypt(struct blkcipher_desc *desc,
	300	struct scatterlist dst, struct scatterlist src,
	301	unsigned int nbytes)
	302	{
	303	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	304	struct blkcipher_walk walk;
	305	int err, ret;
	306
	307	blkcipher_walk_init(&walk, dst, src, nbytes);
	308	err = blkcipher_walk_virt(desc, &walk);
	309
	310	while((nbytes = walk.nbytes)) {
	311	op->src = walk.src.virt.addr,
	312	op->dst = walk.dst.virt.addr;
	313	op->mode = AES_MODE_ECB;
	314	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	315	op->dir = AES_DIR_ENCRYPT;
	316
	317	ret = geode_aes_crypt(op);
	318	nbytes -= ret;
	319	ret = blkcipher_walk_done(desc, &walk, nbytes);
	320	}
	321
	322	return err;
	323	}
	324
	325	static struct crypto_alg geode_ecb_alg = {
	326	.cra_name = "ecb(aes)",
	327	.cra_driver_name = "ecb-aes-geode-128",
	328	.cra_priority = 400,
	329	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	330	.cra_blocksize = AES_MIN_BLOCK_SIZE,
331	.cra_ctxsize = sizeof(struct geode_aes_op),
332	.cra_alignmask = 15,
333	.cra_type = &crypto_blkcipher_type,
334	.cra_module = THIS_MODULE,
335	.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
336	.cra_u = {
337	.blkcipher = {
338	.min_keysize = AES_KEY_LENGTH,
339	.max_keysize = AES_KEY_LENGTH,
340	.setkey = geode_setkey,
341	.encrypt = geode_ecb_encrypt,
342	.decrypt = geode_ecb_decrypt,
343	}
344	}
345	};
346
347	static void
348	geode_aes_remove(struct pci_dev *dev)
349	{
350	crypto_unregister_alg(&geode_alg);
351	crypto_unregister_alg(&geode_ecb_alg);
352	crypto_unregister_alg(&geode_cbc_alg);
353
354	pci_iounmap(dev, _iobase);
355	_iobase = NULL;
356
357	pci_release_regions(dev);
358	pci_disable_device(dev);
359	}
360
361
362	static int
363	geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
364	{
365	int ret;
366
367	if ((ret = pci_enable_device(dev)))
368	return ret;
369
370	if ((ret = pci_request_regions(dev, "geode-aes-128")))
371	goto eenable;
372
373	_iobase = pci_iomap(dev, 0, 0);
374
375	if (_iobase == NULL) {
376	ret = -ENOMEM;
377	goto erequest;
378	}
379
380	spin_lock_init(&lock);
381
382	/* Clear any pending activity */
383	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
384
385	if ((ret = crypto_register_alg(&geode_alg)))
386	goto eiomap;
387
388	if ((ret = crypto_register_alg(&geode_ecb_alg)))
389	goto ealg;
390
391	if ((ret = crypto_register_alg(&geode_cbc_alg)))
392	goto eecb;
393
394	printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
395	return 0;
396
397	eecb:
398	crypto_unregister_alg(&geode_ecb_alg);
399
400	ealg:
401	crypto_unregister_alg(&geode_alg);
402
403	eiomap:
404	pci_iounmap(dev, _iobase);
405
406	erequest:
407	pci_release_regions(dev);
408
409	eenable:
410	pci_disable_device(dev);
411
412	printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
413	return ret;
414	}
415
416	static struct pci_device_id geode_aes_tbl[] = {
417	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
418	{ 0, }
419	};
420
421	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
422
423	static struct pci_driver geode_aes_driver = {
424	.name = "Geode LX AES",
425	.id_table = geode_aes_tbl,
426	.probe = geode_aes_probe,
427	.remove = __devexit_p(geode_aes_remove)
428	};
429
430	static int __init
431	geode_aes_init(void)
432	{
09cb914f	433	return pci_register_driver(&geode_aes_driver);
9fe757b0 JC	434	}
	435
	436	static void __exit
	437	geode_aes_exit(void)
	438	{
	439	pci_unregister_driver(&geode_aes_driver);
	440	}
	441
	442	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	443	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	444	MODULE_LICENSE("GPL");
	445
	446	module_init(geode_aes_init);
	447	module_exit(geode_aes_exit);