[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/sched.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;
}

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