[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 <crypto/aes.h>

#include <linux/io.h>
#include <linux/delay.h>

#include "geode-aes.h"

/* 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);
		cpu_relax();
	} 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;
	int ret;

	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);
	}

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

	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_cip(struct crypto_tfm *tfm, const u8 *key,
		unsigned int len)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	unsigned int ret;

	op->keylen = len;

	if (len == AES_KEYSIZE_128) {
		memcpy(op->key, key, len);
		return 0;
	}

	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
		/* not supported at all */
		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
		return -EINVAL;
	}

	/*
	 * The requested key size is not supported by HW, do a fallback
	 */
	op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	op->fallback.cip->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);

	ret = crypto_cipher_setkey(op->fallback.cip, key, len);
	if (ret) {
		tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
		tfm->crt_flags |= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
	}
	return ret;
}

static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
		unsigned int len)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	unsigned int ret;

	op->keylen = len;

	if (len == AES_KEYSIZE_128) {
		memcpy(op->key, key, len);
		return 0;
	}

	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
		/* not supported at all */
		tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
		return -EINVAL;
	}

	/*
	 * The requested key size is not supported by HW, do a fallback
	 */
	op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);

	ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
	if (ret) {
		tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
		tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
	}
	return ret;
}

static int fallback_blk_dec(struct blkcipher_desc *desc,
		struct scatterlist *dst, struct scatterlist *src,
		unsigned int nbytes)
{
	unsigned int ret;
	struct crypto_blkcipher *tfm;
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);

	tfm = desc->tfm;
	desc->tfm = op->fallback.blk;

	ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);

	desc->tfm = tfm;
	return ret;
}
static int fallback_blk_enc(struct blkcipher_desc *desc,
		struct scatterlist *dst, struct scatterlist *src,
		unsigned int nbytes)
{
	unsigned int ret;
	struct crypto_blkcipher *tfm;
	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);

	tfm = desc->tfm;
	desc->tfm = op->fallback.blk;

	ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);

	desc->tfm = tfm;
	return ret;
}

static void
geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
		crypto_cipher_encrypt_one(op->fallback.cip, out, in);
		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 (unlikely(op->keylen != AES_KEYSIZE_128)) {
		crypto_cipher_decrypt_one(op->fallback.cip, out, in);
		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 int fallback_init_cip(struct crypto_tfm *tfm)
{
	const char *name = tfm->__crt_alg->cra_name;
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	op->fallback.cip = crypto_alloc_cipher(name, 0,
				CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);

	if (IS_ERR(op->fallback.cip)) {
		printk(KERN_ERR "Error allocating fallback algo %s\n", name);
		return PTR_ERR(op->fallback.cip);
	}

	return 0;
}

static void fallback_exit_cip(struct crypto_tfm *tfm)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	crypto_free_cipher(op->fallback.cip);
	op->fallback.cip = NULL;
}

static struct crypto_alg geode_alg = {
	.cra_name			=	"aes",
	.cra_driver_name	=	"geode-aes",
	.cra_priority		=	300,
	.cra_alignmask		=	15,
	.cra_flags			=	CRYPTO_ALG_TYPE_CIPHER |
							CRYPTO_ALG_NEED_FALLBACK,
	.cra_init			=	fallback_init_cip,
	.cra_exit			=	fallback_exit_cip,
	.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_MIN_KEY_SIZE,
			.cia_max_keysize	=	AES_MAX_KEY_SIZE,
			.cia_setkey			=	geode_setkey_cip,
			.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;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_dec(desc, dst, src, nbytes);

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);
	op->iv = walk.iv;

	while ((nbytes = walk.nbytes)) {
		op->src = walk.src.virt.addr,
		op->dst = walk.dst.virt.addr;
		op->mode = AES_MODE_CBC;
		op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
		op->dir = AES_DIR_DECRYPT;

		ret = geode_aes_crypt(op);

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

	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;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_enc(desc, dst, src, nbytes);

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);
	op->iv = walk.iv;

	while ((nbytes = walk.nbytes)) {
		op->src = walk.src.virt.addr,
		op->dst = walk.dst.virt.addr;
		op->mode = AES_MODE_CBC;
		op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
		op->dir = AES_DIR_ENCRYPT;

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

	return err;
}

static int fallback_init_blk(struct crypto_tfm *tfm)
{
	const char *name = tfm->__crt_alg->cra_name;
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	op->fallback.blk = crypto_alloc_blkcipher(name, 0,
			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);

	if (IS_ERR(op->fallback.blk)) {
		printk(KERN_ERR "Error allocating fallback algo %s\n", name);
		return PTR_ERR(op->fallback.blk);
	}

	return 0;
}

static void fallback_exit_blk(struct crypto_tfm *tfm)
{
	struct geode_aes_op *op = crypto_tfm_ctx(tfm);

	crypto_free_blkcipher(op->fallback.blk);
	op->fallback.blk = NULL;
}

static struct crypto_alg geode_cbc_alg = {
	.cra_name		=	"cbc(aes)",
	.cra_driver_name	=	"cbc-aes-geode",
	.cra_priority		=	400,
	.cra_flags			=	CRYPTO_ALG_TYPE_BLKCIPHER |
						CRYPTO_ALG_KERN_DRIVER_ONLY |
						CRYPTO_ALG_NEED_FALLBACK,
	.cra_init			=	fallback_init_blk,
	.cra_exit			=	fallback_exit_blk,
	.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_MIN_KEY_SIZE,
			.max_keysize	=	AES_MAX_KEY_SIZE,
			.setkey			=	geode_setkey_blk,
			.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;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_dec(desc, dst, src, nbytes);

	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;

	if (unlikely(op->keylen != AES_KEYSIZE_128))
		return fallback_blk_enc(desc, dst, src, nbytes);

	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",
	.cra_priority		=	400,
	.cra_flags			=	CRYPTO_ALG_TYPE_BLKCIPHER |
						CRYPTO_ALG_KERN_DRIVER_ONLY |
						CRYPTO_ALG_NEED_FALLBACK,
	.cra_init			=	fallback_init_blk,
	.cra_exit			=	fallback_exit_blk,
	.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_MIN_KEY_SIZE,
			.max_keysize	=	AES_MAX_KEY_SIZE,
			.setkey			=	geode_setkey_blk,
			.encrypt		=	geode_ecb_encrypt,
			.decrypt		=	geode_ecb_decrypt,
		}
	}
};

static void __devexit
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 __devinit
geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	int ret;
	ret = pci_enable_device(dev);
	if (ret)
		return ret;

	ret = pci_request_regions(dev, "geode-aes");
	if (ret)
		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);

	ret = crypto_register_alg(&geode_alg);
	if (ret)
		goto eiomap;

	ret = crypto_register_alg(&geode_ecb_alg);
	if (ret)
		goto ealg;

	ret = crypto_register_alg(&geode_cbc_alg);
	if (ret)
		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_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), } ,
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, geode_aes_tbl);

static struct pci_driver geode_aes_driver = {
	.name = "Geode LX AES",
	.id_table = geode_aes_tbl,
	.probe = geode_aes_probe,
	.remove = __devexit_p(geode_aes_remove)
};

static int __init
geode_aes_init(void)
{
	return pci_register_driver(&geode_aes_driver);
}

static void __exit
geode_aes_exit(void)
{
	pci_unregister_driver(&geode_aes_driver);
}

MODULE_AUTHOR("Advanced Micro Devices, Inc.");
MODULE_DESCRIPTION("Geode LX Hardware AES driver");
MODULE_LICENSE("GPL");

module_init(geode_aes_init);
module_exit(geode_aes_exit);
Commit	Line	Data
9fe757b0 JC	1	/* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2 of the License, or
	6	* (at your option) any later version.
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/kernel.h>
9fe757b0 JC	11	#include <linux/pci.h>
	12	#include <linux/pci_ids.h>
	13	#include <linux/crypto.h>
	14	#include <linux/spinlock.h>
	15	#include <crypto/algapi.h>
89e12654	16	#include <crypto/aes.h>
9fe757b0	17
99700716 CC	18	#include <linux/io.h>
99700716 CC	19	#include <linux/delay.h>
9fe757b0 JC	20
	21	#include "geode-aes.h"
	22
9fe757b0 JC	23	/* Static structures */
9fe757b0 JC	24
99700716	25	static void __iomem *_iobase;
9fe757b0 JC	26	static spinlock_t lock;
	27
	28	/* Write a 128 bit field (either a writable key or IV) */
	29	static inline void
	30	_writefield(u32 offset, void *value)
	31	{
	32	int i;
99700716	33	for (i = 0; i < 4; i++)
9fe757b0 JC	34	iowrite32(((u32 ) value)[i], _iobase + offset + (i 4));
	35	}
	36
	37	/* Read a 128 bit field (either a writable key or IV) */
	38	static inline void
	39	_readfield(u32 offset, void *value)
	40	{
	41	int i;
99700716	42	for (i = 0; i < 4; i++)
9fe757b0 JC	43	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	44	}
	45
	46	static int
	47	do_crypt(void src, void dst, int len, u32 flags)
	48	{
	49	u32 status;
	50	u32 counter = AES_OP_TIMEOUT;
	51
	52	iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
	53	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
	54	iowrite32(len, _iobase + AES_LENA_REG);
	55
	56	/* Start the operation */
	57	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
	58
1f4e4773	59	do {
9fe757b0	60	status = ioread32(_iobase + AES_INTR_REG);
1f4e4773	61	cpu_relax();
99700716	62	} while (!(status & AES_INTRA_PENDING) && --counter);
9fe757b0 JC	63
	64	/* Clear the event */
	65	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
	66	return counter ? 0 : 1;
	67	}
	68
ab782705	69	static unsigned int
9fe757b0 JC	70	geode_aes_crypt(struct geode_aes_op *op)
9fe757b0 JC	71	{
9fe757b0	72	u32 flags = 0;
5efee174	73	unsigned long iflags;
1f4e4773	74	int ret;
9fe757b0	75
761e7846	76	if (op->len == 0)
9fe757b0 JC	77	return 0;
9fe757b0 JC	78
761e7846 JC	79	/* If the source and destination is the same, then
	80	* we need to turn on the coherent flags, otherwise
	81	* we don't need to worry
	82	*/
	83
2e21630d	84	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0 JC	85
	86	if (op->dir == AES_DIR_ENCRYPT)
	87	flags \|= AES_CTRL_ENCRYPT;
	88
	89	/* Start the critical section */
	90
	91	spin_lock_irqsave(&lock, iflags);
	92
	93	if (op->mode == AES_MODE_CBC) {
	94	flags \|= AES_CTRL_CBC;
	95	_writefield(AES_WRITEIV0_REG, op->iv);
	96	}
	97
761e7846	98	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
9fe757b0 JC	99	flags \|= AES_CTRL_WRKEY;
	100	_writefield(AES_WRITEKEY0_REG, op->key);
	101	}
	102
1f4e4773 SS	103	ret = do_crypt(op->src, op->dst, op->len, flags);
1f4e4773 SS	104	BUG_ON(ret);
9fe757b0 JC	105
	106	if (op->mode == AES_MODE_CBC)
	107	_readfield(AES_WRITEIV0_REG, op->iv);
	108
	109	spin_unlock_irqrestore(&lock, iflags);
	110
	111	return op->len;
	112	}
	113
	114	/* CRYPTO-API Functions */
	115
cd7c3bfe SS	116	static int geode_setkey_cip(struct crypto_tfm tfm, const u8 key,
cd7c3bfe SS	117	unsigned int len)
9fe757b0 JC	118	{
9fe757b0 JC	119	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
cd7c3bfe SS	120	unsigned int ret;
	121
	122	op->keylen = len;
	123
	124	if (len == AES_KEYSIZE_128) {
	125	memcpy(op->key, key, len);
	126	return 0;
	127	}
9fe757b0	128
cd7c3bfe SS	129	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
cd7c3bfe SS	130	/* not supported at all */
9fe757b0 JC	131	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	132	return -EINVAL;
	133	}
	134
cd7c3bfe SS	135	/*
	136	* The requested key size is not supported by HW, do a fallback
	137	*/
faad98f2 RK	138	op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
faad98f2 RK	139	op->fallback.cip->base.crt_flags \|= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
cd7c3bfe SS	140
	141	ret = crypto_cipher_setkey(op->fallback.cip, key, len);
	142	if (ret) {
	143	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
e054f164	144	tfm->crt_flags \|= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
cd7c3bfe SS	145	}
	146	return ret;
	147	}
	148
	149	static int geode_setkey_blk(struct crypto_tfm tfm, const u8 key,
	150	unsigned int len)
	151	{
	152	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	153	unsigned int ret;
	154
	155	op->keylen = len;
	156
	157	if (len == AES_KEYSIZE_128) {
	158	memcpy(op->key, key, len);
	159	return 0;
	160	}
	161
	162	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
	163	/* not supported at all */
	164	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	165	return -EINVAL;
	166	}
	167
	168	/*
	169	* The requested key size is not supported by HW, do a fallback
	170	*/
	171	op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	172	op->fallback.blk->base.crt_flags \|= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
	173
	174	ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
	175	if (ret) {
	176	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
	177	tfm->crt_flags \|= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
	178	}
	179	return ret;
	180	}
	181
	182	static int fallback_blk_dec(struct blkcipher_desc *desc,
	183	struct scatterlist dst, struct scatterlist src,
	184	unsigned int nbytes)
	185	{
	186	unsigned int ret;
	187	struct crypto_blkcipher *tfm;
	188	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	189
	190	tfm = desc->tfm;
	191	desc->tfm = op->fallback.blk;
	192
fdc520aa	193	ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
cd7c3bfe SS	194
	195	desc->tfm = tfm;
	196	return ret;
	197	}
	198	static int fallback_blk_enc(struct blkcipher_desc *desc,
	199	struct scatterlist dst, struct scatterlist src,
	200	unsigned int nbytes)
	201	{
	202	unsigned int ret;
	203	struct crypto_blkcipher *tfm;
	204	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	205
	206	tfm = desc->tfm;
	207	desc->tfm = op->fallback.blk;
	208
fdc520aa	209	ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
cd7c3bfe SS	210
	211	desc->tfm = tfm;
	212	return ret;
9fe757b0 JC	213	}
	214
	215	static void
	216	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	217	{
	218	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	219
cd7c3bfe SS	220	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
cd7c3bfe SS	221	crypto_cipher_encrypt_one(op->fallback.cip, out, in);
9fe757b0	222	return;
cd7c3bfe	223	}
9fe757b0 JC	224
	225	op->src = (void *) in;
	226	op->dst = (void *) out;
	227	op->mode = AES_MODE_ECB;
	228	op->flags = 0;
	229	op->len = AES_MIN_BLOCK_SIZE;
	230	op->dir = AES_DIR_ENCRYPT;
	231
	232	geode_aes_crypt(op);
	233	}
	234
	235
	236	static void
	237	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	238	{
	239	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	240
cd7c3bfe SS	241	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
cd7c3bfe SS	242	crypto_cipher_decrypt_one(op->fallback.cip, out, in);
9fe757b0	243	return;
cd7c3bfe	244	}
9fe757b0 JC	245
	246	op->src = (void *) in;
	247	op->dst = (void *) out;
	248	op->mode = AES_MODE_ECB;
	249	op->flags = 0;
	250	op->len = AES_MIN_BLOCK_SIZE;
	251	op->dir = AES_DIR_DECRYPT;
	252
	253	geode_aes_crypt(op);
	254	}
	255
cd7c3bfe SS	256	static int fallback_init_cip(struct crypto_tfm *tfm)
	257	{
	258	const char *name = tfm->__crt_alg->cra_name;
	259	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	260
	261	op->fallback.cip = crypto_alloc_cipher(name, 0,
	262	CRYPTO_ALG_ASYNC \| CRYPTO_ALG_NEED_FALLBACK);
	263
	264	if (IS_ERR(op->fallback.cip)) {
	265	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
faad98f2	266	return PTR_ERR(op->fallback.cip);
cd7c3bfe SS	267	}
	268
	269	return 0;
	270	}
	271
	272	static void fallback_exit_cip(struct crypto_tfm *tfm)
	273	{
	274	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	275
	276	crypto_free_cipher(op->fallback.cip);
	277	op->fallback.cip = NULL;
	278	}
9fe757b0 JC	279
9fe757b0 JC	280	static struct crypto_alg geode_alg = {
cd7c3bfe SS	281	.cra_name = "aes",
	282	.cra_driver_name = "geode-aes",
	283	.cra_priority = 300,
	284	.cra_alignmask = 15,
	285	.cra_flags = CRYPTO_ALG_TYPE_CIPHER \|
	286	CRYPTO_ALG_NEED_FALLBACK,
	287	.cra_init = fallback_init_cip,
	288	.cra_exit = fallback_exit_cip,
9fe757b0 JC	289	.cra_blocksize = AES_MIN_BLOCK_SIZE,
9fe757b0 JC	290	.cra_ctxsize = sizeof(struct geode_aes_op),
cd7c3bfe SS	291	.cra_module = THIS_MODULE,
	292	.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
	293	.cra_u = {
	294	.cipher = {
	295	.cia_min_keysize = AES_MIN_KEY_SIZE,
	296	.cia_max_keysize = AES_MAX_KEY_SIZE,
	297	.cia_setkey = geode_setkey_cip,
	298	.cia_encrypt = geode_encrypt,
	299	.cia_decrypt = geode_decrypt
9fe757b0 JC	300	}
	301	}
	302	};
	303
	304	static int
	305	geode_cbc_decrypt(struct blkcipher_desc *desc,
	306	struct scatterlist dst, struct scatterlist src,
	307	unsigned int nbytes)
	308	{
	309	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	310	struct blkcipher_walk walk;
	311	int err, ret;
	312
cd7c3bfe SS	313	if (unlikely(op->keylen != AES_KEYSIZE_128))
	314	return fallback_blk_dec(desc, dst, src, nbytes);
	315
9fe757b0 JC	316	blkcipher_walk_init(&walk, dst, src, nbytes);
9fe757b0 JC	317	err = blkcipher_walk_virt(desc, &walk);
d2456c66	318	op->iv = walk.iv;
9fe757b0	319
99700716	320	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	321	op->src = walk.src.virt.addr,
	322	op->dst = walk.dst.virt.addr;
	323	op->mode = AES_MODE_CBC;
	324	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	325	op->dir = AES_DIR_DECRYPT;
	326
9fe757b0 JC	327	ret = geode_aes_crypt(op);
9fe757b0 JC	328
9fe757b0	329	nbytes -= ret;
9fe757b0 JC	330	err = blkcipher_walk_done(desc, &walk, nbytes);
	331	}
	332
	333	return err;
	334	}
	335
	336	static int
	337	geode_cbc_encrypt(struct blkcipher_desc *desc,
	338	struct scatterlist dst, struct scatterlist src,
	339	unsigned int nbytes)
	340	{
	341	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	342	struct blkcipher_walk walk;
	343	int err, ret;
	344
cd7c3bfe SS	345	if (unlikely(op->keylen != AES_KEYSIZE_128))
	346	return fallback_blk_enc(desc, dst, src, nbytes);
	347
9fe757b0 JC	348	blkcipher_walk_init(&walk, dst, src, nbytes);
9fe757b0 JC	349	err = blkcipher_walk_virt(desc, &walk);
d2456c66	350	op->iv = walk.iv;
9fe757b0	351
99700716	352	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	353	op->src = walk.src.virt.addr,
	354	op->dst = walk.dst.virt.addr;
	355	op->mode = AES_MODE_CBC;
	356	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	357	op->dir = AES_DIR_ENCRYPT;
	358
9fe757b0 JC	359	ret = geode_aes_crypt(op);
	360	nbytes -= ret;
	361	err = blkcipher_walk_done(desc, &walk, nbytes);
	362	}
	363
	364	return err;
	365	}
	366
cd7c3bfe SS	367	static int fallback_init_blk(struct crypto_tfm *tfm)
	368	{
	369	const char *name = tfm->__crt_alg->cra_name;
	370	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	371
	372	op->fallback.blk = crypto_alloc_blkcipher(name, 0,
	373	CRYPTO_ALG_ASYNC \| CRYPTO_ALG_NEED_FALLBACK);
	374
	375	if (IS_ERR(op->fallback.blk)) {
	376	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
	377	return PTR_ERR(op->fallback.blk);
	378	}
	379
	380	return 0;
	381	}
	382
	383	static void fallback_exit_blk(struct crypto_tfm *tfm)
	384	{
	385	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	386
	387	crypto_free_blkcipher(op->fallback.blk);
	388	op->fallback.blk = NULL;
	389	}
	390
9fe757b0 JC	391	static struct crypto_alg geode_cbc_alg = {
9fe757b0 JC	392	.cra_name = "cbc(aes)",
cd7c3bfe	393	.cra_driver_name = "cbc-aes-geode",
9fe757b0	394	.cra_priority = 400,
cd7c3bfe	395	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
d912bb76 NM	396	CRYPTO_ALG_KERN_DRIVER_ONLY \|
d912bb76 NM	397	CRYPTO_ALG_NEED_FALLBACK,
cd7c3bfe SS	398	.cra_init = fallback_init_blk,
cd7c3bfe SS	399	.cra_exit = fallback_exit_blk,
9fe757b0 JC	400	.cra_blocksize = AES_MIN_BLOCK_SIZE,
	401	.cra_ctxsize = sizeof(struct geode_aes_op),
	402	.cra_alignmask = 15,
cd7c3bfe SS	403	.cra_type = &crypto_blkcipher_type,
	404	.cra_module = THIS_MODULE,
	405	.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
	406	.cra_u = {
	407	.blkcipher = {
	408	.min_keysize = AES_MIN_KEY_SIZE,
	409	.max_keysize = AES_MAX_KEY_SIZE,
	410	.setkey = geode_setkey_blk,
9fe757b0 JC	411	.encrypt = geode_cbc_encrypt,
9fe757b0 JC	412	.decrypt = geode_cbc_decrypt,
761e7846	413	.ivsize = AES_IV_LENGTH,
9fe757b0 JC	414	}
	415	}
	416	};
	417
	418	static int
	419	geode_ecb_decrypt(struct blkcipher_desc *desc,
	420	struct scatterlist dst, struct scatterlist src,
	421	unsigned int nbytes)
	422	{
	423	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	424	struct blkcipher_walk walk;
	425	int err, ret;
	426
cd7c3bfe SS	427	if (unlikely(op->keylen != AES_KEYSIZE_128))
	428	return fallback_blk_dec(desc, dst, src, nbytes);
	429
9fe757b0 JC	430	blkcipher_walk_init(&walk, dst, src, nbytes);
	431	err = blkcipher_walk_virt(desc, &walk);
	432
99700716	433	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	434	op->src = walk.src.virt.addr,
	435	op->dst = walk.dst.virt.addr;
	436	op->mode = AES_MODE_ECB;
	437	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	438	op->dir = AES_DIR_DECRYPT;
	439
	440	ret = geode_aes_crypt(op);
	441	nbytes -= ret;
	442	err = blkcipher_walk_done(desc, &walk, nbytes);
	443	}
	444
	445	return err;
	446	}
	447
	448	static int
	449	geode_ecb_encrypt(struct blkcipher_desc *desc,
	450	struct scatterlist dst, struct scatterlist src,
	451	unsigned int nbytes)
	452	{
	453	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	454	struct blkcipher_walk walk;
	455	int err, ret;
	456
cd7c3bfe SS	457	if (unlikely(op->keylen != AES_KEYSIZE_128))
	458	return fallback_blk_enc(desc, dst, src, nbytes);
	459
9fe757b0 JC	460	blkcipher_walk_init(&walk, dst, src, nbytes);
	461	err = blkcipher_walk_virt(desc, &walk);
	462
99700716	463	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	464	op->src = walk.src.virt.addr,
	465	op->dst = walk.dst.virt.addr;
	466	op->mode = AES_MODE_ECB;
	467	op->len = nbytes - (nbytes % AES_MIN_BLOCK_SIZE);
	468	op->dir = AES_DIR_ENCRYPT;
	469
	470	ret = geode_aes_crypt(op);
	471	nbytes -= ret;
	472	ret = blkcipher_walk_done(desc, &walk, nbytes);
	473	}
	474
	475	return err;
	476	}
	477
	478	static struct crypto_alg geode_ecb_alg = {
cd7c3bfe SS	479	.cra_name = "ecb(aes)",
cd7c3bfe SS	480	.cra_driver_name = "ecb-aes-geode",
9fe757b0	481	.cra_priority = 400,
cd7c3bfe	482	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
d912bb76 NM	483	CRYPTO_ALG_KERN_DRIVER_ONLY \|
d912bb76 NM	484	CRYPTO_ALG_NEED_FALLBACK,
cd7c3bfe SS	485	.cra_init = fallback_init_blk,
cd7c3bfe SS	486	.cra_exit = fallback_exit_blk,
9fe757b0 JC	487	.cra_blocksize = AES_MIN_BLOCK_SIZE,
	488	.cra_ctxsize = sizeof(struct geode_aes_op),
	489	.cra_alignmask = 15,
cd7c3bfe SS	490	.cra_type = &crypto_blkcipher_type,
	491	.cra_module = THIS_MODULE,
	492	.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
	493	.cra_u = {
	494	.blkcipher = {
	495	.min_keysize = AES_MIN_KEY_SIZE,
	496	.max_keysize = AES_MAX_KEY_SIZE,
	497	.setkey = geode_setkey_blk,
9fe757b0 JC	498	.encrypt = geode_ecb_encrypt,
	499	.decrypt = geode_ecb_decrypt,
	500	}
	501	}
	502	};
	503
f17922bc	504	static void __devexit
9fe757b0 JC	505	geode_aes_remove(struct pci_dev *dev)
	506	{
	507	crypto_unregister_alg(&geode_alg);
	508	crypto_unregister_alg(&geode_ecb_alg);
	509	crypto_unregister_alg(&geode_cbc_alg);
	510
	511	pci_iounmap(dev, _iobase);
	512	_iobase = NULL;
	513
	514	pci_release_regions(dev);
	515	pci_disable_device(dev);
	516	}
	517
	518
f17922bc	519	static int __devinit
9fe757b0 JC	520	geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
	521	{
	522	int ret;
99700716 CC	523	ret = pci_enable_device(dev);
99700716 CC	524	if (ret)
9fe757b0 JC	525	return ret;
9fe757b0 JC	526
99700716 CC	527	ret = pci_request_regions(dev, "geode-aes");
99700716 CC	528	if (ret)
9fe757b0 JC	529	goto eenable;
	530
	531	_iobase = pci_iomap(dev, 0, 0);
	532
	533	if (_iobase == NULL) {
	534	ret = -ENOMEM;
	535	goto erequest;
	536	}
	537
	538	spin_lock_init(&lock);
	539
	540	/* Clear any pending activity */
	541	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
	542
99700716 CC	543	ret = crypto_register_alg(&geode_alg);
99700716 CC	544	if (ret)
9fe757b0 JC	545	goto eiomap;
9fe757b0 JC	546
99700716 CC	547	ret = crypto_register_alg(&geode_ecb_alg);
99700716 CC	548	if (ret)
9fe757b0 JC	549	goto ealg;
9fe757b0 JC	550
99700716 CC	551	ret = crypto_register_alg(&geode_cbc_alg);
99700716 CC	552	if (ret)
9fe757b0 JC	553	goto eecb;
	554
	555	printk(KERN_NOTICE "geode-aes: GEODE AES engine enabled.\n");
	556	return 0;
	557
	558	eecb:
	559	crypto_unregister_alg(&geode_ecb_alg);
	560
	561	ealg:
	562	crypto_unregister_alg(&geode_alg);
	563
	564	eiomap:
	565	pci_iounmap(dev, _iobase);
	566
	567	erequest:
	568	pci_release_regions(dev);
	569
	570	eenable:
	571	pci_disable_device(dev);
	572
	573	printk(KERN_ERR "geode-aes: GEODE AES initialization failed.\n");
	574	return ret;
	575	}
	576
	577	static struct pci_device_id geode_aes_tbl[] = {
1fb1defb	578	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), } ,
9fe757b0 JC	579	{ 0, }
	580	};
	581
	582	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
	583
	584	static struct pci_driver geode_aes_driver = {
	585	.name = "Geode LX AES",
	586	.id_table = geode_aes_tbl,
	587	.probe = geode_aes_probe,
	588	.remove = __devexit_p(geode_aes_remove)
	589	};
	590
	591	static int __init
	592	geode_aes_init(void)
	593	{
09cb914f	594	return pci_register_driver(&geode_aes_driver);
9fe757b0 JC	595	}
	596
	597	static void __exit
	598	geode_aes_exit(void)
	599	{
	600	pci_unregister_driver(&geode_aes_driver);
	601	}
	602
	603	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	604	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	605	MODULE_LICENSE("GPL");
	606
	607	module_init(geode_aes_init);
	608	module_exit(geode_aes_exit);