[net-next-2.6.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"

/* Register definitions */

#define AES_CTRLA_REG  0x0000

#define AES_CTRL_START     0x01
#define AES_CTRL_DECRYPT   0x00
#define AES_CTRL_ENCRYPT   0x02
#define AES_CTRL_WRKEY     0x04
#define AES_CTRL_DCA       0x08
#define AES_CTRL_SCA       0x10
#define AES_CTRL_CBC       0x20

#define AES_INTR_REG  0x0008

#define AES_INTRA_PENDING (1 << 16)
#define AES_INTRB_PENDING (1 << 17)

#define AES_INTR_PENDING  (AES_INTRA_PENDING | AES_INTRB_PENDING)
#define AES_INTR_MASK     0x07

#define AES_SOURCEA_REG   0x0010
#define AES_DSTA_REG      0x0014
#define AES_LENA_REG      0x0018
#define AES_WRITEKEY0_REG 0x0030
#define AES_WRITEIV0_REG  0x0040

/*  A very large counter that is used to gracefully bail out of an
 *  operation in case of trouble
 */

#define AES_OP_TIMEOUT    0x50000

/* 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);
	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;

	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);
	}

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

	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
	23	/* Register definitions */
	24
	25	#define AES_CTRLA_REG 0x0000
	26
	27	#define AES_CTRL_START 0x01
	28	#define AES_CTRL_DECRYPT 0x00
	29	#define AES_CTRL_ENCRYPT 0x02
	30	#define AES_CTRL_WRKEY 0x04
	31	#define AES_CTRL_DCA 0x08
	32	#define AES_CTRL_SCA 0x10
	33	#define AES_CTRL_CBC 0x20
	34
	35	#define AES_INTR_REG 0x0008
	36
	37	#define AES_INTRA_PENDING (1 << 16)
	38	#define AES_INTRB_PENDING (1 << 17)
	39
	40	#define AES_INTR_PENDING (AES_INTRA_PENDING \| AES_INTRB_PENDING)
	41	#define AES_INTR_MASK 0x07
	42
	43	#define AES_SOURCEA_REG 0x0010
	44	#define AES_DSTA_REG 0x0014
	45	#define AES_LENA_REG 0x0018
	46	#define AES_WRITEKEY0_REG 0x0030
	47	#define AES_WRITEIV0_REG 0x0040
	48
	49	/* A very large counter that is used to gracefully bail out of an
	50	* operation in case of trouble
	51	*/
	52
	53	#define AES_OP_TIMEOUT 0x50000
	54
	55	/* Static structures */
	56
	57	static void __iomem * _iobase;
	58	static spinlock_t lock;
	59
	60	/* Write a 128 bit field (either a writable key or IV) */
	61	static inline void
	62	_writefield(u32 offset, void *value)
	63	{
	64	int i;
	65	for(i = 0; i < 4; i++)
	66	iowrite32(((u32 ) value)[i], _iobase + offset + (i 4));
	67	}
	68
	69	/* Read a 128 bit field (either a writable key or IV) */
	70	static inline void
	71	_readfield(u32 offset, void *value)
	72	{
	73	int i;
	74	for(i = 0; i < 4; i++)
	75	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	76	}
	77
	78	static int
	79	do_crypt(void src, void dst, int len, u32 flags)
	80	{
81	u32 status;
82	u32 counter = AES_OP_TIMEOUT;
83
84	iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
85	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
86	iowrite32(len, _iobase + AES_LENA_REG);
87
88	/* Start the operation */
89	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
90
91	do
92	status = ioread32(_iobase + AES_INTR_REG);
93	while(!(status & AES_INTRA_PENDING) && --counter);
94
95	/* Clear the event */
96	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
97	return counter ? 0 : 1;
98	}
99
ab782705	100	static unsigned int
9fe757b0 JC	101	geode_aes_crypt(struct geode_aes_op *op)
9fe757b0 JC	102	{
9fe757b0	103	u32 flags = 0;
5efee174	104	unsigned long iflags;
9fe757b0	105
761e7846	106	if (op->len == 0)
9fe757b0 JC	107	return 0;
9fe757b0 JC	108
761e7846 JC	109	/* If the source and destination is the same, then
	110	* we need to turn on the coherent flags, otherwise
	111	* we don't need to worry
	112	*/
	113
2e21630d	114	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0 JC	115
	116	if (op->dir == AES_DIR_ENCRYPT)
	117	flags \|= AES_CTRL_ENCRYPT;
	118
	119	/* Start the critical section */
	120
	121	spin_lock_irqsave(&lock, iflags);
	122
	123	if (op->mode == AES_MODE_CBC) {
	124	flags \|= AES_CTRL_CBC;
	125	_writefield(AES_WRITEIV0_REG, op->iv);
	126	}
	127
761e7846	128	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
9fe757b0 JC	129	flags \|= AES_CTRL_WRKEY;
	130	_writefield(AES_WRITEKEY0_REG, op->key);
	131	}
	132
	133	do_crypt(op->src, op->dst, op->len, flags);
	134
	135	if (op->mode == AES_MODE_CBC)
	136	_readfield(AES_WRITEIV0_REG, op->iv);
	137
	138	spin_unlock_irqrestore(&lock, iflags);
	139
	140	return op->len;
	141	}
	142
	143	/* CRYPTO-API Functions */
	144
	145	static int
	146	geode_setkey(struct crypto_tfm tfm, const u8 key, unsigned int len)
	147	{
	148	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	149
	150	if (len != AES_KEY_LENGTH) {
	151	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	152	return -EINVAL;
	153	}
	154
	155	memcpy(op->key, key, len);
	156	return 0;
	157	}
	158
	159	static void
	160	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	161	{
	162	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	163
	164	if ((out == NULL) \|\| (in == NULL))
	165	return;
	166
	167	op->src = (void *) in;
	168	op->dst = (void *) out;
	169	op->mode = AES_MODE_ECB;
	170	op->flags = 0;
	171	op->len = AES_MIN_BLOCK_SIZE;
	172	op->dir = AES_DIR_ENCRYPT;
	173
	174	geode_aes_crypt(op);
	175	}
	176
	177
	178	static void
	179	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	180	{
	181	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	182
	183	if ((out == NULL) \|\| (in == NULL))
	184	return;
	185
	186	op->src = (void *) in;
	187	op->dst = (void *) out;
	188	op->mode = AES_MODE_ECB;
	189	op->flags = 0;
	190	op->len = AES_MIN_BLOCK_SIZE;
	191	op->dir = AES_DIR_DECRYPT;
	192
193	geode_aes_crypt(op);
194	}
195
196
197	static struct crypto_alg geode_alg = {
198	.cra_name = "aes",
199	.cra_driver_name = "geode-aes-128",
200	.cra_priority = 300,
201	.cra_alignmask = 15,
202	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
203	.cra_blocksize = AES_MIN_BLOCK_SIZE,
204	.cra_ctxsize = sizeof(struct geode_aes_op),
205	.cra_module = THIS_MODULE,
206	.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
207	.cra_u = {
208	.cipher = {
209	.cia_min_keysize = AES_KEY_LENGTH,
210	.cia_max_keysize = AES_KEY_LENGTH,
211	.cia_setkey = geode_setkey,
212	.cia_encrypt = geode_encrypt,
213	.cia_decrypt = geode_decrypt
214	}
215	}
216	};
217
218	static int
219	geode_cbc_decrypt(struct blkcipher_desc *desc,
220	struct scatterlist dst, struct scatterlist src,
221	unsigned int nbytes)
222	{
223	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
224	struct blkcipher_walk walk;
225	int err, ret;
226
227	blkcipher_walk_init(&walk, dst, src, nbytes);
228	err = blkcipher_walk_virt(desc, &walk);
2d506d4f	229	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
9fe757b0 JC	230
	231	while((nbytes = walk.nbytes)) {
	232	op->src = walk.src.virt.addr,
	233	op->dst = walk.dst.virt.addr;
	234	op->mode = AES_MODE_CBC;
	235	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	236	op->dir = AES_DIR_DECRYPT;
	237
9fe757b0 JC	238	ret = geode_aes_crypt(op);
9fe757b0 JC	239
9fe757b0	240	nbytes -= ret;
9fe757b0 JC	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 int
	249	geode_cbc_encrypt(struct blkcipher_desc *desc,
	250	struct scatterlist dst, struct scatterlist src,
	251	unsigned int nbytes)
	252	{
	253	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	254	struct blkcipher_walk walk;
	255	int err, ret;
	256
	257	blkcipher_walk_init(&walk, dst, src, nbytes);
	258	err = blkcipher_walk_virt(desc, &walk);
2d506d4f	259	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
9fe757b0 JC	260
	261	while((nbytes = walk.nbytes)) {
	262	op->src = walk.src.virt.addr,
	263	op->dst = walk.dst.virt.addr;
	264	op->mode = AES_MODE_CBC;
	265	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	266	op->dir = AES_DIR_ENCRYPT;
	267
9fe757b0 JC	268	ret = geode_aes_crypt(op);
	269	nbytes -= ret;
	270	err = blkcipher_walk_done(desc, &walk, nbytes);
	271	}
	272
2d506d4f	273	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
9fe757b0 JC	274	return err;
	275	}
	276
	277	static struct crypto_alg geode_cbc_alg = {
	278	.cra_name = "cbc(aes)",
	279	.cra_driver_name = "cbc-aes-geode-128",
	280	.cra_priority = 400,
	281	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	282	.cra_blocksize = AES_MIN_BLOCK_SIZE,
	283	.cra_ctxsize = sizeof(struct geode_aes_op),
	284	.cra_alignmask = 15,
	285	.cra_type = &crypto_blkcipher_type,
	286	.cra_module = THIS_MODULE,
	287	.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
	288	.cra_u = {
	289	.blkcipher = {
	290	.min_keysize = AES_KEY_LENGTH,
	291	.max_keysize = AES_KEY_LENGTH,
	292	.setkey = geode_setkey,
	293	.encrypt = geode_cbc_encrypt,
	294	.decrypt = geode_cbc_decrypt,
761e7846	295	.ivsize = AES_IV_LENGTH,
9fe757b0 JC	296	}
	297	}
	298	};
	299
	300	static int
	301	geode_ecb_decrypt(struct blkcipher_desc *desc,
	302	struct scatterlist dst, struct scatterlist src,
	303	unsigned int nbytes)
	304	{
	305	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	306	struct blkcipher_walk walk;
	307	int err, ret;
	308
	309	blkcipher_walk_init(&walk, dst, src, nbytes);
	310	err = blkcipher_walk_virt(desc, &walk);
	311
	312	while((nbytes = walk.nbytes)) {
	313	op->src = walk.src.virt.addr,
	314	op->dst = walk.dst.virt.addr;
	315	op->mode = AES_MODE_ECB;
	316	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	317	op->dir = AES_DIR_DECRYPT;
	318
	319	ret = geode_aes_crypt(op);
	320	nbytes -= ret;
	321	err = blkcipher_walk_done(desc, &walk, nbytes);
	322	}
	323
	324	return err;
	325	}
	326
	327	static int
	328	geode_ecb_encrypt(struct blkcipher_desc *desc,
	329	struct scatterlist dst, struct scatterlist src,
	330	unsigned int nbytes)
	331	{
	332	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	333	struct blkcipher_walk walk;
	334	int err, ret;
	335
	336	blkcipher_walk_init(&walk, dst, src, nbytes);
	337	err = blkcipher_walk_virt(desc, &walk);
	338
	339	while((nbytes = walk.nbytes)) {
	340	op->src = walk.src.virt.addr,
	341	op->dst = walk.dst.virt.addr;
	342	op->mode = AES_MODE_ECB;
	343	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	344	op->dir = AES_DIR_ENCRYPT;
	345
	346	ret = geode_aes_crypt(op);
	347	nbytes -= ret;
	348	ret = blkcipher_walk_done(desc, &walk, nbytes);
	349	}
	350
	351	return err;
	352	}
	353
	354	static struct crypto_alg geode_ecb_alg = {
	355	.cra_name = "ecb(aes)",
	356	.cra_driver_name = "ecb-aes-geode-128",
	357	.cra_priority = 400,
	358	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	359	.cra_blocksize = AES_MIN_BLOCK_SIZE,
360	.cra_ctxsize = sizeof(struct geode_aes_op),
361	.cra_alignmask = 15,
362	.cra_type = &crypto_blkcipher_type,
363	.cra_module = THIS_MODULE,
364	.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
365	.cra_u = {
366	.blkcipher = {
367	.min_keysize = AES_KEY_LENGTH,
368	.max_keysize = AES_KEY_LENGTH,
369	.setkey = geode_setkey,
370	.encrypt = geode_ecb_encrypt,
371	.decrypt = geode_ecb_decrypt,
372	}
373	}
374	};
375
376	static void
377	geode_aes_remove(struct pci_dev *dev)
378	{
379	crypto_unregister_alg(&geode_alg);
380	crypto_unregister_alg(&geode_ecb_alg);
381	crypto_unregister_alg(&geode_cbc_alg);
382
383	pci_iounmap(dev, _iobase);
384	_iobase = NULL;
385
386	pci_release_regions(dev);
387	pci_disable_device(dev);
388	}
389
390
391	static int
392	geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
393	{
394	int ret;
395
396	if ((ret = pci_enable_device(dev)))
397	return ret;
398
399	if ((ret = pci_request_regions(dev, "geode-aes-128")))
400	goto eenable;
401
402	_iobase = pci_iomap(dev, 0, 0);
403
404	if (_iobase == NULL) {
405	ret = -ENOMEM;
406	goto erequest;
407	}
408
409	spin_lock_init(&lock);
410
411	/* Clear any pending activity */
412	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
413
414	if ((ret = crypto_register_alg(&geode_alg)))
415	goto eiomap;
416
417	if ((ret = crypto_register_alg(&geode_ecb_alg)))
418	goto ealg;
419
420	if ((ret = crypto_register_alg(&geode_cbc_alg)))
421	goto eecb;
422
423	printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
424	return 0;
425
426	eecb:
427	crypto_unregister_alg(&geode_ecb_alg);
428
429	ealg:
430	crypto_unregister_alg(&geode_alg);
431
432	eiomap:
433	pci_iounmap(dev, _iobase);
434
435	erequest:
436	pci_release_regions(dev);
437
438	eenable:
439	pci_disable_device(dev);
440
441	printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
442	return ret;
443	}
444
445	static struct pci_device_id geode_aes_tbl[] = {
446	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
447	{ 0, }
448	};
449
450	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
451
452	static struct pci_driver geode_aes_driver = {
453	.name = "Geode LX AES",
454	.id_table = geode_aes_tbl,
455	.probe = geode_aes_probe,
456	.remove = __devexit_p(geode_aes_remove)
457	};
458
459	static int __init
460	geode_aes_init(void)
461	{
09cb914f	462	return pci_register_driver(&geode_aes_driver);
9fe757b0 JC	463	}
	464
	465	static void __exit
	466	geode_aes_exit(void)
	467	{
	468	pci_unregister_driver(&geode_aes_driver);
	469	}
	470
	471	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	472	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	473	MODULE_LICENSE("GPL");
	474
	475	module_init(geode_aes_init);
	476	module_exit(geode_aes_exit);