[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;
	int iflags;

	if (op->len == 0 || op->src == op->dst)
		return 0;

	if (op->flags & AES_FLAGS_COHERENT)
		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_USRKEY) {
		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,
		}
	}
};

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)
	101	{
	102
	103	u32 flags = 0;
	104	int iflags;
	105
	106	if (op->len == 0 \|\| op->src == op->dst)
	107	return 0;
	108
	109	if (op->flags & AES_FLAGS_COHERENT)
	110	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
	111
	112	if (op->dir == AES_DIR_ENCRYPT)
	113	flags \|= AES_CTRL_ENCRYPT;
	114
	115	/* Start the critical section */
	116
	117	spin_lock_irqsave(&lock, iflags);
	118
	119	if (op->mode == AES_MODE_CBC) {
	120	flags \|= AES_CTRL_CBC;
	121	_writefield(AES_WRITEIV0_REG, op->iv);
	122	}
	123
	124	if (op->flags & AES_FLAGS_USRKEY) {
	125	flags \|= AES_CTRL_WRKEY;
	126	_writefield(AES_WRITEKEY0_REG, op->key);
	127	}
	128
	129	do_crypt(op->src, op->dst, op->len, flags);
	130
	131	if (op->mode == AES_MODE_CBC)
	132	_readfield(AES_WRITEIV0_REG, op->iv);
	133
	134	spin_unlock_irqrestore(&lock, iflags);
	135
	136	return op->len;
	137	}
	138
	139	/* CRYPTO-API Functions */
	140
	141	static int
	142	geode_setkey(struct crypto_tfm tfm, const u8 key, unsigned int len)
	143	{
	144	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	145
	146	if (len != AES_KEY_LENGTH) {
	147	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	148	return -EINVAL;
	149	}
	150
	151	memcpy(op->key, key, len);
	152	return 0;
	153	}
	154
	155	static void
	156	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	157	{
	158	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	159
	160	if ((out == NULL) \|\| (in == NULL))
	161	return;
	162
	163	op->src = (void *) in;
164	op->dst = (void *) out;
165	op->mode = AES_MODE_ECB;
166	op->flags = 0;
167	op->len = AES_MIN_BLOCK_SIZE;
168	op->dir = AES_DIR_ENCRYPT;
169
170	geode_aes_crypt(op);
171	}
172
173
174	static void
175	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
176	{
177	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
178
179	if ((out == NULL) \|\| (in == NULL))
180	return;
181
182	op->src = (void *) in;
183	op->dst = (void *) out;
184	op->mode = AES_MODE_ECB;
185	op->flags = 0;
186	op->len = AES_MIN_BLOCK_SIZE;
187	op->dir = AES_DIR_DECRYPT;
188
189	geode_aes_crypt(op);
190	}
191
192
193	static struct crypto_alg geode_alg = {
194	.cra_name = "aes",
195	.cra_driver_name = "geode-aes-128",
196	.cra_priority = 300,
197	.cra_alignmask = 15,
198	.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
199	.cra_blocksize = AES_MIN_BLOCK_SIZE,
200	.cra_ctxsize = sizeof(struct geode_aes_op),
201	.cra_module = THIS_MODULE,
202	.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
203	.cra_u = {
204	.cipher = {
205	.cia_min_keysize = AES_KEY_LENGTH,
206	.cia_max_keysize = AES_KEY_LENGTH,
207	.cia_setkey = geode_setkey,
208	.cia_encrypt = geode_encrypt,
209	.cia_decrypt = geode_decrypt
210	}
211	}
212	};
213
214	static int
215	geode_cbc_decrypt(struct blkcipher_desc *desc,
216	struct scatterlist dst, struct scatterlist src,
217	unsigned int nbytes)
218	{
219	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
220	struct blkcipher_walk walk;
221	int err, ret;
222
223	blkcipher_walk_init(&walk, dst, src, nbytes);
224	err = blkcipher_walk_virt(desc, &walk);
225
226	while((nbytes = walk.nbytes)) {
227	op->src = walk.src.virt.addr,
228	op->dst = walk.dst.virt.addr;
229	op->mode = AES_MODE_CBC;
230	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
231	op->dir = AES_DIR_DECRYPT;
232
233	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
234
235	ret = geode_aes_crypt(op);
236
237	memcpy(walk.iv, op->iv, AES_IV_LENGTH);
238	nbytes -= ret;
239
240	err = blkcipher_walk_done(desc, &walk, nbytes);
241	}
242
243	return err;
244	}
245
246	static int
247	geode_cbc_encrypt(struct blkcipher_desc *desc,
248	struct scatterlist dst, struct scatterlist src,
249	unsigned int nbytes)
250	{
251	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
252	struct blkcipher_walk walk;
253	int err, ret;
254
255	blkcipher_walk_init(&walk, dst, src, nbytes);
256	err = blkcipher_walk_virt(desc, &walk);
257
258	while((nbytes = walk.nbytes)) {
259	op->src = walk.src.virt.addr,
260	op->dst = walk.dst.virt.addr;
261	op->mode = AES_MODE_CBC;
262	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
263	op->dir = AES_DIR_ENCRYPT;
264
265	memcpy(op->iv, walk.iv, AES_IV_LENGTH);
266
267	ret = geode_aes_crypt(op);
268	nbytes -= ret;
269	err = blkcipher_walk_done(desc, &walk, nbytes);
270	}
271
272	return err;
273	}
274
275	static struct crypto_alg geode_cbc_alg = {
276	.cra_name = "cbc(aes)",
277	.cra_driver_name = "cbc-aes-geode-128",
278	.cra_priority = 400,
279	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
280	.cra_blocksize = AES_MIN_BLOCK_SIZE,
281	.cra_ctxsize = sizeof(struct geode_aes_op),
282	.cra_alignmask = 15,
283	.cra_type = &crypto_blkcipher_type,
284	.cra_module = THIS_MODULE,
285	.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
286	.cra_u = {
287	.blkcipher = {
288	.min_keysize = AES_KEY_LENGTH,
289	.max_keysize = AES_KEY_LENGTH,
290	.setkey = geode_setkey,
291	.encrypt = geode_cbc_encrypt,
292	.decrypt = geode_cbc_decrypt,
293	}
294	}
295	};
296
297	static int
298	geode_ecb_decrypt(struct blkcipher_desc *desc,
299	struct scatterlist dst, struct scatterlist src,
300	unsigned int nbytes)
301	{
302	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
303	struct blkcipher_walk walk;
304	int err, ret;
305
306	blkcipher_walk_init(&walk, dst, src, nbytes);
307	err = blkcipher_walk_virt(desc, &walk);
308
309	while((nbytes = walk.nbytes)) {
310	op->src = walk.src.virt.addr,
311	op->dst = walk.dst.virt.addr;
312	op->mode = AES_MODE_ECB;
313	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
314	op->dir = AES_DIR_DECRYPT;
315
316	ret = geode_aes_crypt(op);
317	nbytes -= ret;
318	err = blkcipher_walk_done(desc, &walk, nbytes);
319	}
320
321	return err;
322	}
323
324	static int
325	geode_ecb_encrypt(struct blkcipher_desc *desc,
326	struct scatterlist dst, struct scatterlist src,
327	unsigned int nbytes)
328	{
329	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
330	struct blkcipher_walk walk;
331	int err, ret;
332
333	blkcipher_walk_init(&walk, dst, src, nbytes);
334	err = blkcipher_walk_virt(desc, &walk);
335
336	while((nbytes = walk.nbytes)) {
337	op->src = walk.src.virt.addr,
338	op->dst = walk.dst.virt.addr;
339	op->mode = AES_MODE_ECB;
340	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
341	op->dir = AES_DIR_ENCRYPT;
342
343	ret = geode_aes_crypt(op);
344	nbytes -= ret;
345	ret = blkcipher_walk_done(desc, &walk, nbytes);
346	}
347
348	return err;
349	}
350
351	static struct crypto_alg geode_ecb_alg = {
352	.cra_name = "ecb(aes)",
353	.cra_driver_name = "ecb-aes-geode-128",
354	.cra_priority = 400,
355	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
356	.cra_blocksize = AES_MIN_BLOCK_SIZE,
357	.cra_ctxsize = sizeof(struct geode_aes_op),
358	.cra_alignmask = 15,
359	.cra_type = &crypto_blkcipher_type,
360	.cra_module = THIS_MODULE,
361	.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
362	.cra_u = {
363	.blkcipher = {
364	.min_keysize = AES_KEY_LENGTH,
365	.max_keysize = AES_KEY_LENGTH,
366	.setkey = geode_setkey,
367	.encrypt = geode_ecb_encrypt,
368	.decrypt = geode_ecb_decrypt,
369	}
370	}
371	};
372
373	static void
374	geode_aes_remove(struct pci_dev *dev)
375	{
376	crypto_unregister_alg(&geode_alg);
377	crypto_unregister_alg(&geode_ecb_alg);
378	crypto_unregister_alg(&geode_cbc_alg);
379
380	pci_iounmap(dev, _iobase);
381	_iobase = NULL;
382
383	pci_release_regions(dev);
384	pci_disable_device(dev);
385	}
386
387
388	static int
389	geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
390	{
391	int ret;
392
393	if ((ret = pci_enable_device(dev)))
394	return ret;
395
396	if ((ret = pci_request_regions(dev, "geode-aes-128")))
397	goto eenable;
398
399	_iobase = pci_iomap(dev, 0, 0);
400
401	if (_iobase == NULL) {
402	ret = -ENOMEM;
403	goto erequest;
404	}
405
406	spin_lock_init(&lock);
407
408	/* Clear any pending activity */
409	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
410
411	if ((ret = crypto_register_alg(&geode_alg)))
412	goto eiomap;
413
414	if ((ret = crypto_register_alg(&geode_ecb_alg)))
415	goto ealg;
416
417	if ((ret = crypto_register_alg(&geode_cbc_alg)))
418	goto eecb;
419
420	printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
421	return 0;
422
423	eecb:
424	crypto_unregister_alg(&geode_ecb_alg);
425
426	ealg:
427	crypto_unregister_alg(&geode_alg);
428
429	eiomap:
430	pci_iounmap(dev, _iobase);
431
432	erequest:
433	pci_release_regions(dev);
434
435	eenable:
436	pci_disable_device(dev);
437
438	printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
439	return ret;
440	}
441
442	static struct pci_device_id geode_aes_tbl[] = {
443	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES, PCI_ANY_ID, PCI_ANY_ID} ,
444	{ 0, }
445	};
446
447	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
448
449	static struct pci_driver geode_aes_driver = {
450	.name = "Geode LX AES",
451	.id_table = geode_aes_tbl,
452	.probe = geode_aes_probe,
453	.remove = __devexit_p(geode_aes_remove)
454	};
455
456	static int __init
457	geode_aes_init(void)
458	{
09cb914f	459	return pci_register_driver(&geode_aes_driver);
9fe757b0 JC	460	}
	461
	462	static void __exit
	463	geode_aes_exit(void)
	464	{
	465	pci_unregister_driver(&geode_aes_driver);
	466	}
	467
	468	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	469	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	470	MODULE_LICENSE("GPL");
	471
	472	module_init(geode_aes_init);
	473	module_exit(geode_aes_exit);