[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_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_BLOCK_SIZE;
	op->dir = AES_DIR_DECRYPT;

	geode_aes_crypt(op);
}

static int fallback_init_cip(struct crypto_tfm *tfm)
{
	const char *name = crypto_tfm_alg_name(tfm);
	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_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_module			=	THIS_MODULE,
	.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_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_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 = crypto_tfm_alg_name(tfm);
	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_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_alignmask		=	15,
	.cra_type			=	&crypto_blkcipher_type,
	.cra_module			=	THIS_MODULE,
	.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_BLOCK_SIZE,
		}
	}
};

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_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_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_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct geode_aes_op),
	.cra_alignmask		=	15,
	.cra_type			=	&crypto_blkcipher_type,
	.cra_module			=	THIS_MODULE,
	.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 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;

	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;

	dev_notice(&dev->dev, "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);

	dev_err(&dev->dev, "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 = geode_aes_remove,
};

module_pci_driver(geode_aes_driver);

MODULE_AUTHOR("Advanced Micro Devices, Inc.");
MODULE_DESCRIPTION("Geode LX Hardware AES driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9fe757b0	1	/* Copyright (C) 2004-2006, Advanced Micro Devices, Inc.
24086e3d CG	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	*/
9fe757b0 JC	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;
24086e3d	33
99700716	34	for (i = 0; i < 4; i++)
9fe757b0 JC	35	iowrite32(((u32 ) value)[i], _iobase + offset + (i 4));
	36	}
	37
	38	/* Read a 128 bit field (either a writable key or IV) */
	39	static inline void
	40	_readfield(u32 offset, void *value)
	41	{
	42	int i;
24086e3d	43
99700716	44	for (i = 0; i < 4; i++)
9fe757b0 JC	45	((u32 ) value)[i] = ioread32(_iobase + offset + (i 4));
	46	}
	47
	48	static int
	49	do_crypt(void src, void dst, int len, u32 flags)
	50	{
	51	u32 status;
	52	u32 counter = AES_OP_TIMEOUT;
	53
	54	iowrite32(virt_to_phys(src), _iobase + AES_SOURCEA_REG);
	55	iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG);
	56	iowrite32(len, _iobase + AES_LENA_REG);
	57
	58	/* Start the operation */
	59	iowrite32(AES_CTRL_START \| flags, _iobase + AES_CTRLA_REG);
	60
1f4e4773	61	do {
9fe757b0	62	status = ioread32(_iobase + AES_INTR_REG);
1f4e4773	63	cpu_relax();
99700716	64	} while (!(status & AES_INTRA_PENDING) && --counter);
9fe757b0 JC	65
	66	/* Clear the event */
	67	iowrite32((status & 0xFF) \| AES_INTRA_PENDING, _iobase + AES_INTR_REG);
	68	return counter ? 0 : 1;
	69	}
	70
ab782705	71	static unsigned int
9fe757b0 JC	72	geode_aes_crypt(struct geode_aes_op *op)
9fe757b0 JC	73	{
9fe757b0	74	u32 flags = 0;
5efee174	75	unsigned long iflags;
1f4e4773	76	int ret;
9fe757b0	77
761e7846	78	if (op->len == 0)
9fe757b0 JC	79	return 0;
9fe757b0 JC	80
761e7846 JC	81	/* If the source and destination is the same, then
	82	* we need to turn on the coherent flags, otherwise
	83	* we don't need to worry
	84	*/
	85
2e21630d	86	flags \|= (AES_CTRL_DCA \| AES_CTRL_SCA);
9fe757b0 JC	87
	88	if (op->dir == AES_DIR_ENCRYPT)
	89	flags \|= AES_CTRL_ENCRYPT;
	90
	91	/* Start the critical section */
	92
	93	spin_lock_irqsave(&lock, iflags);
	94
	95	if (op->mode == AES_MODE_CBC) {
	96	flags \|= AES_CTRL_CBC;
	97	_writefield(AES_WRITEIV0_REG, op->iv);
	98	}
	99
761e7846	100	if (!(op->flags & AES_FLAGS_HIDDENKEY)) {
9fe757b0 JC	101	flags \|= AES_CTRL_WRKEY;
	102	_writefield(AES_WRITEKEY0_REG, op->key);
	103	}
	104
1f4e4773 SS	105	ret = do_crypt(op->src, op->dst, op->len, flags);
1f4e4773 SS	106	BUG_ON(ret);
9fe757b0 JC	107
	108	if (op->mode == AES_MODE_CBC)
	109	_readfield(AES_WRITEIV0_REG, op->iv);
	110
	111	spin_unlock_irqrestore(&lock, iflags);
	112
	113	return op->len;
	114	}
	115
	116	/* CRYPTO-API Functions */
	117
cd7c3bfe SS	118	static int geode_setkey_cip(struct crypto_tfm tfm, const u8 key,
cd7c3bfe SS	119	unsigned int len)
9fe757b0 JC	120	{
9fe757b0 JC	121	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
cd7c3bfe SS	122	unsigned int ret;
	123
	124	op->keylen = len;
	125
	126	if (len == AES_KEYSIZE_128) {
	127	memcpy(op->key, key, len);
	128	return 0;
	129	}
9fe757b0	130
cd7c3bfe SS	131	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
cd7c3bfe SS	132	/* not supported at all */
9fe757b0 JC	133	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	134	return -EINVAL;
	135	}
	136
cd7c3bfe SS	137	/*
	138	* The requested key size is not supported by HW, do a fallback
	139	*/
faad98f2 RK	140	op->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
faad98f2 RK	141	op->fallback.cip->base.crt_flags \|= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
cd7c3bfe SS	142
	143	ret = crypto_cipher_setkey(op->fallback.cip, key, len);
	144	if (ret) {
	145	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
e054f164	146	tfm->crt_flags \|= (op->fallback.cip->base.crt_flags & CRYPTO_TFM_RES_MASK);
cd7c3bfe SS	147	}
	148	return ret;
	149	}
	150
	151	static int geode_setkey_blk(struct crypto_tfm tfm, const u8 key,
	152	unsigned int len)
	153	{
	154	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	155	unsigned int ret;
	156
	157	op->keylen = len;
	158
	159	if (len == AES_KEYSIZE_128) {
	160	memcpy(op->key, key, len);
	161	return 0;
	162	}
	163
	164	if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
	165	/* not supported at all */
	166	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	167	return -EINVAL;
	168	}
	169
	170	/*
	171	* The requested key size is not supported by HW, do a fallback
	172	*/
	173	op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
	174	op->fallback.blk->base.crt_flags \|= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
	175
	176	ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
	177	if (ret) {
	178	tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
	179	tfm->crt_flags \|= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
	180	}
	181	return ret;
	182	}
	183
	184	static int fallback_blk_dec(struct blkcipher_desc *desc,
	185	struct scatterlist dst, struct scatterlist src,
	186	unsigned int nbytes)
	187	{
	188	unsigned int ret;
	189	struct crypto_blkcipher *tfm;
	190	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	191
	192	tfm = desc->tfm;
	193	desc->tfm = op->fallback.blk;
	194
fdc520aa	195	ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
cd7c3bfe SS	196
	197	desc->tfm = tfm;
	198	return ret;
	199	}
	200	static int fallback_blk_enc(struct blkcipher_desc *desc,
	201	struct scatterlist dst, struct scatterlist src,
	202	unsigned int nbytes)
	203	{
	204	unsigned int ret;
	205	struct crypto_blkcipher *tfm;
	206	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	207
	208	tfm = desc->tfm;
	209	desc->tfm = op->fallback.blk;
	210
fdc520aa	211	ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
cd7c3bfe SS	212
	213	desc->tfm = tfm;
	214	return ret;
9fe757b0 JC	215	}
	216
	217	static void
	218	geode_encrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	219	{
	220	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	221
cd7c3bfe SS	222	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
cd7c3bfe SS	223	crypto_cipher_encrypt_one(op->fallback.cip, out, in);
9fe757b0	224	return;
cd7c3bfe	225	}
9fe757b0 JC	226
	227	op->src = (void *) in;
	228	op->dst = (void *) out;
	229	op->mode = AES_MODE_ECB;
	230	op->flags = 0;
b9d865e3	231	op->len = AES_BLOCK_SIZE;
9fe757b0 JC	232	op->dir = AES_DIR_ENCRYPT;
	233
	234	geode_aes_crypt(op);
	235	}
	236
	237
	238	static void
	239	geode_decrypt(struct crypto_tfm tfm, u8 out, const u8 *in)
	240	{
	241	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	242
cd7c3bfe SS	243	if (unlikely(op->keylen != AES_KEYSIZE_128)) {
cd7c3bfe SS	244	crypto_cipher_decrypt_one(op->fallback.cip, out, in);
9fe757b0	245	return;
cd7c3bfe	246	}
9fe757b0 JC	247
	248	op->src = (void *) in;
	249	op->dst = (void *) out;
	250	op->mode = AES_MODE_ECB;
	251	op->flags = 0;
b9d865e3	252	op->len = AES_BLOCK_SIZE;
9fe757b0 JC	253	op->dir = AES_DIR_DECRYPT;
	254
	255	geode_aes_crypt(op);
	256	}
	257
cd7c3bfe SS	258	static int fallback_init_cip(struct crypto_tfm *tfm)
cd7c3bfe SS	259	{
d207a38c	260	const char *name = crypto_tfm_alg_name(tfm);
cd7c3bfe SS	261	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	262
	263	op->fallback.cip = crypto_alloc_cipher(name, 0,
	264	CRYPTO_ALG_ASYNC \| CRYPTO_ALG_NEED_FALLBACK);
	265
	266	if (IS_ERR(op->fallback.cip)) {
	267	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
faad98f2	268	return PTR_ERR(op->fallback.cip);
cd7c3bfe SS	269	}
	270
	271	return 0;
	272	}
	273
	274	static void fallback_exit_cip(struct crypto_tfm *tfm)
	275	{
	276	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	277
	278	crypto_free_cipher(op->fallback.cip);
	279	op->fallback.cip = NULL;
	280	}
9fe757b0 JC	281
9fe757b0 JC	282	static struct crypto_alg geode_alg = {
cd7c3bfe SS	283	.cra_name = "aes",
	284	.cra_driver_name = "geode-aes",
	285	.cra_priority = 300,
	286	.cra_alignmask = 15,
	287	.cra_flags = CRYPTO_ALG_TYPE_CIPHER \|
	288	CRYPTO_ALG_NEED_FALLBACK,
	289	.cra_init = fallback_init_cip,
	290	.cra_exit = fallback_exit_cip,
b9d865e3	291	.cra_blocksize = AES_BLOCK_SIZE,
9fe757b0	292	.cra_ctxsize = sizeof(struct geode_aes_op),
cd7c3bfe	293	.cra_module = THIS_MODULE,
cd7c3bfe SS	294	.cra_u = {
	295	.cipher = {
	296	.cia_min_keysize = AES_MIN_KEY_SIZE,
	297	.cia_max_keysize = AES_MAX_KEY_SIZE,
	298	.cia_setkey = geode_setkey_cip,
	299	.cia_encrypt = geode_encrypt,
	300	.cia_decrypt = geode_decrypt
9fe757b0 JC	301	}
	302	}
	303	};
	304
	305	static int
	306	geode_cbc_decrypt(struct blkcipher_desc *desc,
	307	struct scatterlist dst, struct scatterlist src,
	308	unsigned int nbytes)
	309	{
	310	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	311	struct blkcipher_walk walk;
	312	int err, ret;
	313
cd7c3bfe SS	314	if (unlikely(op->keylen != AES_KEYSIZE_128))
	315	return fallback_blk_dec(desc, dst, src, nbytes);
	316
9fe757b0 JC	317	blkcipher_walk_init(&walk, dst, src, nbytes);
9fe757b0 JC	318	err = blkcipher_walk_virt(desc, &walk);
d2456c66	319	op->iv = walk.iv;
9fe757b0	320
99700716	321	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	322	op->src = walk.src.virt.addr,
	323	op->dst = walk.dst.virt.addr;
	324	op->mode = AES_MODE_CBC;
b9d865e3	325	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	326	op->dir = AES_DIR_DECRYPT;
9fe757b0 JC	327
9fe757b0 JC	328	ret = geode_aes_crypt(op);
9fe757b0 JC	329
9fe757b0	330	nbytes -= ret;
9fe757b0 JC	331	err = blkcipher_walk_done(desc, &walk, nbytes);
	332	}
	333
	334	return err;
	335	}
	336
	337	static int
	338	geode_cbc_encrypt(struct blkcipher_desc *desc,
	339	struct scatterlist dst, struct scatterlist src,
	340	unsigned int nbytes)
	341	{
	342	struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
	343	struct blkcipher_walk walk;
	344	int err, ret;
	345
cd7c3bfe SS	346	if (unlikely(op->keylen != AES_KEYSIZE_128))
	347	return fallback_blk_enc(desc, dst, src, nbytes);
	348
9fe757b0 JC	349	blkcipher_walk_init(&walk, dst, src, nbytes);
9fe757b0 JC	350	err = blkcipher_walk_virt(desc, &walk);
d2456c66	351	op->iv = walk.iv;
9fe757b0	352
99700716	353	while ((nbytes = walk.nbytes)) {
9fe757b0 JC	354	op->src = walk.src.virt.addr,
	355	op->dst = walk.dst.virt.addr;
	356	op->mode = AES_MODE_CBC;
b9d865e3	357	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	358	op->dir = AES_DIR_ENCRYPT;
9fe757b0 JC	359
9fe757b0 JC	360	ret = geode_aes_crypt(op);
	361	nbytes -= ret;
	362	err = blkcipher_walk_done(desc, &walk, nbytes);
	363	}
	364
	365	return err;
	366	}
	367
cd7c3bfe SS	368	static int fallback_init_blk(struct crypto_tfm *tfm)
cd7c3bfe SS	369	{
d207a38c	370	const char *name = crypto_tfm_alg_name(tfm);
cd7c3bfe SS	371	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	372
	373	op->fallback.blk = crypto_alloc_blkcipher(name, 0,
	374	CRYPTO_ALG_ASYNC \| CRYPTO_ALG_NEED_FALLBACK);
	375
	376	if (IS_ERR(op->fallback.blk)) {
	377	printk(KERN_ERR "Error allocating fallback algo %s\n", name);
	378	return PTR_ERR(op->fallback.blk);
	379	}
	380
	381	return 0;
	382	}
	383
	384	static void fallback_exit_blk(struct crypto_tfm *tfm)
	385	{
	386	struct geode_aes_op *op = crypto_tfm_ctx(tfm);
	387
	388	crypto_free_blkcipher(op->fallback.blk);
	389	op->fallback.blk = NULL;
	390	}
	391
9fe757b0 JC	392	static struct crypto_alg geode_cbc_alg = {
9fe757b0 JC	393	.cra_name = "cbc(aes)",
cd7c3bfe	394	.cra_driver_name = "cbc-aes-geode",
9fe757b0	395	.cra_priority = 400,
cd7c3bfe	396	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
d912bb76 NM	397	CRYPTO_ALG_KERN_DRIVER_ONLY \|
d912bb76 NM	398	CRYPTO_ALG_NEED_FALLBACK,
cd7c3bfe SS	399	.cra_init = fallback_init_blk,
cd7c3bfe SS	400	.cra_exit = fallback_exit_blk,
b9d865e3	401	.cra_blocksize = AES_BLOCK_SIZE,
9fe757b0 JC	402	.cra_ctxsize = sizeof(struct geode_aes_op),
9fe757b0 JC	403	.cra_alignmask = 15,
cd7c3bfe SS	404	.cra_type = &crypto_blkcipher_type,
cd7c3bfe SS	405	.cra_module = THIS_MODULE,
cd7c3bfe SS	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,
bac79a2a	413	.ivsize = AES_BLOCK_SIZE,
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;
b9d865e3	437	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	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;
b9d865e3	467	op->len = nbytes - (nbytes % AES_BLOCK_SIZE);
9fe757b0 JC	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,
b9d865e3	487	.cra_blocksize = AES_BLOCK_SIZE,
9fe757b0 JC	488	.cra_ctxsize = sizeof(struct geode_aes_op),
9fe757b0 JC	489	.cra_alignmask = 15,
cd7c3bfe SS	490	.cra_type = &crypto_blkcipher_type,
cd7c3bfe SS	491	.cra_module = THIS_MODULE,
cd7c3bfe SS	492	.cra_u = {
	493	.blkcipher = {
	494	.min_keysize = AES_MIN_KEY_SIZE,
	495	.max_keysize = AES_MAX_KEY_SIZE,
	496	.setkey = geode_setkey_blk,
9fe757b0 JC	497	.encrypt = geode_ecb_encrypt,
	498	.decrypt = geode_ecb_decrypt,
	499	}
	500	}
	501	};
	502
49cfe4db	503	static void geode_aes_remove(struct pci_dev *dev)
9fe757b0 JC	504	{
	505	crypto_unregister_alg(&geode_alg);
	506	crypto_unregister_alg(&geode_ecb_alg);
	507	crypto_unregister_alg(&geode_cbc_alg);
	508
	509	pci_iounmap(dev, _iobase);
	510	_iobase = NULL;
	511
	512	pci_release_regions(dev);
	513	pci_disable_device(dev);
	514	}
	515
	516
49cfe4db	517	static int geode_aes_probe(struct pci_dev dev, const struct pci_device_id id)
9fe757b0 JC	518	{
9fe757b0 JC	519	int ret;
24086e3d	520
99700716 CC	521	ret = pci_enable_device(dev);
99700716 CC	522	if (ret)
9fe757b0 JC	523	return ret;
9fe757b0 JC	524
99700716 CC	525	ret = pci_request_regions(dev, "geode-aes");
99700716 CC	526	if (ret)
9fe757b0 JC	527	goto eenable;
	528
	529	_iobase = pci_iomap(dev, 0, 0);
	530
	531	if (_iobase == NULL) {
	532	ret = -ENOMEM;
	533	goto erequest;
	534	}
	535
	536	spin_lock_init(&lock);
	537
	538	/* Clear any pending activity */
	539	iowrite32(AES_INTR_PENDING \| AES_INTR_MASK, _iobase + AES_INTR_REG);
	540
99700716 CC	541	ret = crypto_register_alg(&geode_alg);
99700716 CC	542	if (ret)
9fe757b0 JC	543	goto eiomap;
9fe757b0 JC	544
99700716 CC	545	ret = crypto_register_alg(&geode_ecb_alg);
99700716 CC	546	if (ret)
9fe757b0 JC	547	goto ealg;
9fe757b0 JC	548
99700716 CC	549	ret = crypto_register_alg(&geode_cbc_alg);
99700716 CC	550	if (ret)
9fe757b0 JC	551	goto eecb;
9fe757b0 JC	552
701bcbc1	553	dev_notice(&dev->dev, "GEODE AES engine enabled.\n");
9fe757b0 JC	554	return 0;
	555
	556	eecb:
	557	crypto_unregister_alg(&geode_ecb_alg);
	558
	559	ealg:
	560	crypto_unregister_alg(&geode_alg);
	561
	562	eiomap:
	563	pci_iounmap(dev, _iobase);
	564
	565	erequest:
	566	pci_release_regions(dev);
	567
	568	eenable:
	569	pci_disable_device(dev);
	570
701bcbc1	571	dev_err(&dev->dev, "GEODE AES initialization failed.\n");
9fe757b0 JC	572	return ret;
	573	}
	574
	575	static struct pci_device_id geode_aes_tbl[] = {
24086e3d	576	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), },
9fe757b0 JC	577	{ 0, }
	578	};
	579
	580	MODULE_DEVICE_TABLE(pci, geode_aes_tbl);
	581
	582	static struct pci_driver geode_aes_driver = {
	583	.name = "Geode LX AES",
	584	.id_table = geode_aes_tbl,
	585	.probe = geode_aes_probe,
49cfe4db	586	.remove = geode_aes_remove,
9fe757b0 JC	587	};
9fe757b0 JC	588
49d30d3d	589	module_pci_driver(geode_aes_driver);
9fe757b0 JC	590
	591	MODULE_AUTHOR("Advanced Micro Devices, Inc.");
	592	MODULE_DESCRIPTION("Geode LX Hardware AES driver");
	593	MODULE_LICENSE("GPL");