[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 <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
	 */

	if (op->src == op->dst)
		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);

	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;

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

		ret = geode_aes_crypt(op);

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

	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_CBC;
		op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
		op->dir = AES_DIR_ENCRYPT;

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

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

	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_ALIAS("aes");

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>
	16
	17	#include <asm/io.h>
	18	#include <asm/delay.h>
	19
	20	#include "geode-aes.h"
	21
	22	/* Register definitions */
	23
	24	#define AES_CTRLA_REG 0x0000
	25
	26	#define AES_CTRL_START 0x01
	27	#define AES_CTRL_DECRYPT 0x00
	28	#define AES_CTRL_ENCRYPT 0x02
	29	#define AES_CTRL_WRKEY 0x04
	30	#define AES_CTRL_DCA 0x08
	31	#define AES_CTRL_SCA 0x10
	32	#define AES_CTRL_CBC 0x20
	33
	34	#define AES_INTR_REG 0x0008
	35
	36	#define AES_INTRA_PENDING (1 << 16)
	37	#define AES_INTRB_PENDING (1 << 17)
	38
	39	#define AES_INTR_PENDING (AES_INTRA_PENDING \| AES_INTRB_PENDING)
	40	#define AES_INTR_MASK 0x07
	41
	42	#define AES_SOURCEA_REG 0x0010
	43	#define AES_DSTA_REG 0x0014
	44	#define AES_LENA_REG 0x0018
	45	#define AES_WRITEKEY0_REG 0x0030
	46	#define AES_WRITEIV0_REG 0x0040
	47
	48	/* A very large counter that is used to gracefully bail out of an
	49	* operation in case of trouble
	50	*/
	51
	52	#define AES_OP_TIMEOUT 0x50000
	53
	54	/* Static structures */
	55
	56	static void __iomem * _iobase;
	57	static spinlock_t lock;
	58
	59	/* Write a 128 bit field (either a writable key or IV) */
	60	static inline void
	61	_writefield(u32 offset, void *value)
	62	{
	63	int i;
	64	for(i = 0; i < 4; i++)
	65	iowrite32(((u32 ) value)[i], _iobase + offset + (i 4));
	66	}
	67
	68	/* Read a 128 bit field (either a writable key or IV) */
	69	static inline void
	70	_readfield(u32 offset, void *value)
	71	{
	72	int i;
	73	for(i = 0; i < 4; i++)
	74	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
75	}
76
77	static int
78	do_crypt(void src, void dst, int len, u32 flags)
79	{
80	u32 status;
81	u32 counter = AES_OP_TIMEOUT;
82
83	iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
84	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
85	iowrite32(len, _iobase + AES_LENA_REG);
86
87	/* Start the operation */
88	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
89
90	do
91	status = ioread32(_iobase + AES_INTR_REG);
92	while(!(status & AES_INTRA_PENDING) && --counter);
93
94	/* Clear the event */
95	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
96	return counter ? 0 : 1;
97	}
98
ab782705	99	static unsigned int
9fe757b0 JC	100	geode_aes_crypt(struct geode_aes_op *op)
9fe757b0 JC	101	{
9fe757b0	102	u32 flags = 0;
5efee174	103	unsigned long iflags;
9fe757b0	104
761e7846	105	if (op->len == 0)
9fe757b0 JC	106	return 0;
9fe757b0 JC	107
761e7846 JC	108	/* If the source and destination is the same, then
	109	* we need to turn on the coherent flags, otherwise
	110	* we don't need to worry
	111	*/
	112
	113	if (op->src == op->dst)
9fe757b0 JC	114	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
	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);
229
230	while((nbytes = walk.nbytes)) {
231	op->src = walk.src.virt.addr,
232	op->dst = walk.dst.virt.addr;
233	op->mode = AES_MODE_CBC;
234	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
235	op->dir = AES_DIR_DECRYPT;
236
237	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
238
239	ret = geode_aes_crypt(op);
240
241	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
242	nbytes -= ret;
243
244	err = blkcipher_walk_done(desc, &walk, nbytes);
245	}
246
247	return err;
248	}
249
250	static int
251	geode_cbc_encrypt(struct blkcipher_desc *desc,
252	struct scatterlist dst, struct scatterlist src,
253	unsigned int nbytes)
254	{
255	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
256	struct blkcipher_walk walk;
257	int err, ret;
258
259	blkcipher_walk_init(&walk, dst, src, nbytes);
260	err = blkcipher_walk_virt(desc, &walk);
261
262	while((nbytes = walk.nbytes)) {
263	op->src = walk.src.virt.addr,
264	op->dst = walk.dst.virt.addr;
265	op->mode = AES_MODE_CBC;
266	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
267	op->dir = AES_DIR_ENCRYPT;
268
269	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
270
271	ret = geode_aes_crypt(op);
272	nbytes -= ret;
273	err = blkcipher_walk_done(desc, &walk, nbytes);
274	}
275
276	return err;
277	}
278
279	static struct crypto_alg geode_cbc_alg = {
280	.cra_name = "cbc(aes)",
281	.cra_driver_name = "cbc-aes-geode-128",
282	.cra_priority = 400,
283	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
284	.cra_blocksize = AES_MIN_BLOCK_SIZE,
285	.cra_ctxsize = sizeof(struct geode_aes_op),
286	.cra_alignmask = 15,
287	.cra_type = &crypto_blkcipher_type,
288	.cra_module = THIS_MODULE,
289	.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
290	.cra_u = {
291	.blkcipher = {
292	.min_keysize = AES_KEY_LENGTH,
293	.max_keysize = AES_KEY_LENGTH,
294	.setkey = geode_setkey,
295	.encrypt = geode_cbc_encrypt,
296	.decrypt = geode_cbc_decrypt,
761e7846	297	.ivsize = AES_IV_LENGTH,
9fe757b0 JC	298	}
	299	}
	300	};
	301
	302	static int
	303	geode_ecb_decrypt(struct blkcipher_desc *desc,
	304	struct scatterlist dst, struct scatterlist src,
	305	unsigned int nbytes)
	306	{
	307	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	308	struct blkcipher_walk walk;
	309	int err, ret;
	310
	311	blkcipher_walk_init(&walk, dst, src, nbytes);
	312	err = blkcipher_walk_virt(desc, &walk);
	313
	314	while((nbytes = walk.nbytes)) {
	315	op->src = walk.src.virt.addr,
	316	op->dst = walk.dst.virt.addr;
	317	op->mode = AES_MODE_ECB;
	318	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	319	op->dir = AES_DIR_DECRYPT;
	320
	321	ret = geode_aes_crypt(op);
	322	nbytes -= ret;
	323	err = blkcipher_walk_done(desc, &walk, nbytes);
	324	}
	325
	326	return err;
	327	}
	328
	329	static int
	330	geode_ecb_encrypt(struct blkcipher_desc *desc,
	331	struct scatterlist dst, struct scatterlist src,
	332	unsigned int nbytes)
	333	{
	334	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	335	struct blkcipher_walk walk;
	336	int err, ret;
	337
	338	blkcipher_walk_init(&walk, dst, src, nbytes);
	339	err = blkcipher_walk_virt(desc, &walk);
	340
	341	while((nbytes = walk.nbytes)) {
	342	op->src = walk.src.virt.addr,
	343	op->dst = walk.dst.virt.addr;
	344	op->mode = AES_MODE_ECB;
	345	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	346	op->dir = AES_DIR_ENCRYPT;
	347
	348	ret = geode_aes_crypt(op);
	349	nbytes -= ret;
	350	ret = blkcipher_walk_done(desc, &walk, nbytes);
	351	}
	352
	353	return err;
	354	}
	355
	356	static struct crypto_alg geode_ecb_alg = {
	357	.cra_name = "ecb(aes)",
	358	.cra_driver_name = "ecb-aes-geode-128",
	359	.cra_priority = 400,
	360	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	361	.cra_blocksize = AES_MIN_BLOCK_SIZE,
362	.cra_ctxsize = sizeof(struct geode_aes_op),
363	.cra_alignmask = 15,
364	.cra_type = &crypto_blkcipher_type,
365	.cra_module = THIS_MODULE,
366	.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
367	.cra_u = {
368	.blkcipher = {
369	.min_keysize = AES_KEY_LENGTH,
370	.max_keysize = AES_KEY_LENGTH,
371	.setkey = geode_setkey,
372	.encrypt = geode_ecb_encrypt,
373	.decrypt = geode_ecb_decrypt,
374	}
375	}
376	};
377
378	static void
379	geode_aes_remove(struct pci_dev *dev)
380	{
381	crypto_unregister_alg(&geode_alg);
382	crypto_unregister_alg(&geode_ecb_alg);
383	crypto_unregister_alg(&geode_cbc_alg);
384
385	pci_iounmap(dev, _iobase);
386	_iobase = NULL;
387
388	pci_release_regions(dev);
389	pci_disable_device(dev);
390	}
391
392
393	static int
394	geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
395	{
396	int ret;
397
398	if ((ret = pci_enable_device(dev)))
399	return ret;
400
401	if ((ret = pci_request_regions(dev, "geode-aes-128")))
402	goto eenable;
403
404	_iobase = pci_iomap(dev, 0, 0);
405
406	if (_iobase == NULL) {
407	ret = -ENOMEM;
408	goto erequest;
409	}
410
411	spin_lock_init(&lock);
412
413	/* Clear any pending activity */
414	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
415
416	if ((ret = crypto_register_alg(&geode_alg)))
417	goto eiomap;
418
419	if ((ret = crypto_register_alg(&geode_ecb_alg)))
420	goto ealg;
421
422	if ((ret = crypto_register_alg(&geode_cbc_alg)))
423	goto eecb;
424
425	printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
426	return 0;
427
428	eecb:
429	crypto_unregister_alg(&geode_ecb_alg);
430
431	ealg:
432	crypto_unregister_alg(&geode_alg);
433
434	eiomap:
435	pci_iounmap(dev, _iobase);
436
437	erequest:
438	pci_release_regions(dev);
439
440	eenable:
441	pci_disable_device(dev);
442
443	printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
444	return ret;
445	}
446
447	static struct pci_device_id geode_aes_tbl[] = {
448	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
449	{ 0, }
450	};
451
452	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
453
454	static struct pci_driver geode_aes_driver = {
455	.name = "Geode LX AES",
456	.id_table = geode_aes_tbl,
457	.probe = geode_aes_probe,
458	.remove = __devexit_p(geode_aes_remove)
459	};
460
461	static int __init
462	geode_aes_init(void)
463	{
09cb914f	464	return pci_register_driver(&geode_aes_driver);
9fe757b0 JC	465	}
	466
	467	static void __exit
	468	geode_aes_exit(void)
	469	{
	470	pci_unregister_driver(&geode_aes_driver);
	471	}
	472
	473	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	474	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	475	MODULE_LICENSE("GPL");
f8246af0	476	MODULE_ALIAS("aes");
9fe757b0 JC	477
	478	module_init(geode_aes_init);
	479	module_exit(geode_aes_exit);