[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 <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);

	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_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
2e21630d	113	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0 JC	114
	115	if (op->dir == AES_DIR_ENCRYPT)
	116	flags \|= AES_CTRL_ENCRYPT;
	117
	118	/* Start the critical section */
	119
	120	spin_lock_irqsave(&lock, iflags);
	121
	122	if (op->mode == AES_MODE_CBC) {
	123	flags \|= AES_CTRL_CBC;
	124	_writefield(AES_WRITEIV0_REG, op->iv);
	125	}
	126
761e7846	127	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
9fe757b0 JC	128	flags \|= AES_CTRL_WRKEY;
	129	_writefield(AES_WRITEKEY0_REG, op->key);
	130	}
	131
	132	do_crypt(op->src, op->dst, op->len, flags);
	133
	134	if (op->mode == AES_MODE_CBC)
	135	_readfield(AES_WRITEIV0_REG, op->iv);
	136
	137	spin_unlock_irqrestore(&lock, iflags);
	138
	139	return op->len;
	140	}
	141
	142	/* CRYPTO-API Functions */
	143
	144	static int
	145	geode_setkey(struct crypto_tfm tfm, const u8 key, unsigned int len)
	146	{
	147	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	148
	149	if (len != AES_KEY_LENGTH) {
	150	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	151	return -EINVAL;
	152	}
	153
	154	memcpy(op->key, key, len);
	155	return 0;
	156	}
	157
	158	static void
	159	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	160	{
	161	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	162
	163	if ((out == NULL) \|\| (in == NULL))
	164	return;
	165
	166	op->src = (void *) in;
	167	op->dst = (void *) out;
	168	op->mode = AES_MODE_ECB;
	169	op->flags = 0;
	170	op->len = AES_MIN_BLOCK_SIZE;
	171	op->dir = AES_DIR_ENCRYPT;
	172
	173	geode_aes_crypt(op);
	174	}
	175
	176
	177	static void
	178	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	179	{
	180	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	181
	182	if ((out == NULL) \|\| (in == NULL))
	183	return;
	184
	185	op->src = (void *) in;
	186	op->dst = (void *) out;
	187	op->mode = AES_MODE_ECB;
	188	op->flags = 0;
	189	op->len = AES_MIN_BLOCK_SIZE;
	190	op->dir = AES_DIR_DECRYPT;
	191
192	geode_aes_crypt(op);
193	}
194
195
196	static struct crypto_alg geode_alg = {
197	.cra_name = "aes",
198	.cra_driver_name = "geode-aes-128",
199	.cra_priority = 300,
200	.cra_alignmask = 15,
201	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
202	.cra_blocksize = AES_MIN_BLOCK_SIZE,
203	.cra_ctxsize = sizeof(struct geode_aes_op),
204	.cra_module = THIS_MODULE,
205	.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
206	.cra_u = {
207	.cipher = {
208	.cia_min_keysize = AES_KEY_LENGTH,
209	.cia_max_keysize = AES_KEY_LENGTH,
210	.cia_setkey = geode_setkey,
211	.cia_encrypt = geode_encrypt,
212	.cia_decrypt = geode_decrypt
213	}
214	}
215	};
216
217	static int
218	geode_cbc_decrypt(struct blkcipher_desc *desc,
219	struct scatterlist dst, struct scatterlist src,
220	unsigned int nbytes)
221	{
222	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
223	struct blkcipher_walk walk;
224	int err, ret;
225
226	blkcipher_walk_init(&walk, dst, src, nbytes);
227	err = blkcipher_walk_virt(desc, &walk);
228
229	while((nbytes = walk.nbytes)) {
230	op->src = walk.src.virt.addr,
231	op->dst = walk.dst.virt.addr;
232	op->mode = AES_MODE_CBC;
233	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
234	op->dir = AES_DIR_DECRYPT;
235
236	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
237
238	ret = geode_aes_crypt(op);
239
240	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
241	nbytes -= ret;
242
243	err = blkcipher_walk_done(desc, &walk, nbytes);
244	}
245
246	return err;
247	}
248
249	static int
250	geode_cbc_encrypt(struct blkcipher_desc *desc,
251	struct scatterlist dst, struct scatterlist src,
252	unsigned int nbytes)
253	{
254	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
255	struct blkcipher_walk walk;
256	int err, ret;
257
258	blkcipher_walk_init(&walk, dst, src, nbytes);
259	err = blkcipher_walk_virt(desc, &walk);
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
268	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
269
270	ret = geode_aes_crypt(op);
271	nbytes -= ret;
272	err = blkcipher_walk_done(desc, &walk, nbytes);
273	}
274
275	return err;
276	}
277
278	static struct crypto_alg geode_cbc_alg = {
279	.cra_name = "cbc(aes)",
280	.cra_driver_name = "cbc-aes-geode-128",
281	.cra_priority = 400,
282	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
283	.cra_blocksize = AES_MIN_BLOCK_SIZE,
284	.cra_ctxsize = sizeof(struct geode_aes_op),
285	.cra_alignmask = 15,
286	.cra_type = &crypto_blkcipher_type,
287	.cra_module = THIS_MODULE,
288	.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
289	.cra_u = {
290	.blkcipher = {
291	.min_keysize = AES_KEY_LENGTH,
292	.max_keysize = AES_KEY_LENGTH,
293	.setkey = geode_setkey,
294	.encrypt = geode_cbc_encrypt,
295	.decrypt = geode_cbc_decrypt,
761e7846	296	.ivsize = AES_IV_LENGTH,
9fe757b0 JC	297	}
	298	}
	299	};
	300
	301	static int
	302	geode_ecb_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
	310	blkcipher_walk_init(&walk, dst, src, nbytes);
	311	err = blkcipher_walk_virt(desc, &walk);
	312
	313	while((nbytes = walk.nbytes)) {
	314	op->src = walk.src.virt.addr,
	315	op->dst = walk.dst.virt.addr;
	316	op->mode = AES_MODE_ECB;
	317	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	318	op->dir = AES_DIR_DECRYPT;
	319
	320	ret = geode_aes_crypt(op);
	321	nbytes -= ret;
	322	err = blkcipher_walk_done(desc, &walk, nbytes);
	323	}
	324
	325	return err;
	326	}
	327
	328	static int
	329	geode_ecb_encrypt(struct blkcipher_desc *desc,
	330	struct scatterlist dst, struct scatterlist src,
	331	unsigned int nbytes)
	332	{
	333	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	334	struct blkcipher_walk walk;
	335	int err, ret;
	336
	337	blkcipher_walk_init(&walk, dst, src, nbytes);
	338	err = blkcipher_walk_virt(desc, &walk);
	339
	340	while((nbytes = walk.nbytes)) {
	341	op->src = walk.src.virt.addr,
	342	op->dst = walk.dst.virt.addr;
	343	op->mode = AES_MODE_ECB;
	344	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	345	op->dir = AES_DIR_ENCRYPT;
	346
	347	ret = geode_aes_crypt(op);
	348	nbytes -= ret;
	349	ret = blkcipher_walk_done(desc, &walk, nbytes);
	350	}
	351
	352	return err;
	353	}
	354
	355	static struct crypto_alg geode_ecb_alg = {
	356	.cra_name = "ecb(aes)",
	357	.cra_driver_name = "ecb-aes-geode-128",
	358	.cra_priority = 400,
	359	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	360	.cra_blocksize = AES_MIN_BLOCK_SIZE,
361	.cra_ctxsize = sizeof(struct geode_aes_op),
362	.cra_alignmask = 15,
363	.cra_type = &crypto_blkcipher_type,
364	.cra_module = THIS_MODULE,
365	.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
366	.cra_u = {
367	.blkcipher = {
368	.min_keysize = AES_KEY_LENGTH,
369	.max_keysize = AES_KEY_LENGTH,
370	.setkey = geode_setkey,
371	.encrypt = geode_ecb_encrypt,
372	.decrypt = geode_ecb_decrypt,
373	}
374	}
375	};
376
377	static void
378	geode_aes_remove(struct pci_dev *dev)
379	{
380	crypto_unregister_alg(&geode_alg);
381	crypto_unregister_alg(&geode_ecb_alg);
382	crypto_unregister_alg(&geode_cbc_alg);
383
384	pci_iounmap(dev, _iobase);
385	_iobase = NULL;
386
387	pci_release_regions(dev);
388	pci_disable_device(dev);
389	}
390
391
392	static int
393	geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
394	{
395	int ret;
396
397	if ((ret = pci_enable_device(dev)))
398	return ret;
399
400	if ((ret = pci_request_regions(dev, "geode-aes-128")))
401	goto eenable;
402
403	_iobase = pci_iomap(dev, 0, 0);
404
405	if (_iobase == NULL) {
406	ret = -ENOMEM;
407	goto erequest;
408	}
409
410	spin_lock_init(&lock);
411
412	/* Clear any pending activity */
413	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
414
415	if ((ret = crypto_register_alg(&geode_alg)))
416	goto eiomap;
417
418	if ((ret = crypto_register_alg(&geode_ecb_alg)))
419	goto ealg;
420
421	if ((ret = crypto_register_alg(&geode_cbc_alg)))
422	goto eecb;
423
424	printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
425	return 0;
426
427	eecb:
428	crypto_unregister_alg(&geode_ecb_alg);
429
430	ealg:
431	crypto_unregister_alg(&geode_alg);
432
433	eiomap:
434	pci_iounmap(dev, _iobase);
435
436	erequest:
437	pci_release_regions(dev);
438
439	eenable:
440	pci_disable_device(dev);
441
442	printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
443	return ret;
444	}
445
446	static struct pci_device_id geode_aes_tbl[] = {
447	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
448	{ 0, }
449	};
450
451	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
452
453	static struct pci_driver geode_aes_driver = {
454	.name = "Geode LX AES",
455	.id_table = geode_aes_tbl,
456	.probe = geode_aes_probe,
457	.remove = __devexit_p(geode_aes_remove)
458	};
459
460	static int __init
461	geode_aes_init(void)
462	{
09cb914f	463	return pci_register_driver(&geode_aes_driver);
9fe757b0 JC	464	}
	465
	466	static void __exit
	467	geode_aes_exit(void)
	468	{
	469	pci_unregister_driver(&geode_aes_driver);
	470	}
	471
	472	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	473	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	474	MODULE_LICENSE("GPL");
	475
	476	module_init(geode_aes_init);
	477	module_exit(geode_aes_exit);