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Commit 9fe757b0 authored by Jordan Crouse's avatar Jordan Crouse Committed by David S. Miller
Browse files

[PATCH] crypto: Add support for the Geode LX AES hardware 



Add a driver to support the AES hardware on the Geode LX processor.

Signed-off-by: default avatarJordan Crouse <jordan.crouse@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 94b9bb54

drivers/crypto/Kconfig

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Original line number Diff line number Diff line
@@ -51,4 +51,17 @@ config CRYPTO_DEV_PADLOCK_SHA 
	  If unsure say M. The compiled module will be

	  called padlock-sha.ko



config CRYPTO_DEV_GEODE

	tristate "Support for the Geode LX AES engine"

	depends on CRYPTO && X86_32

	select CRYPTO_ALGAPI

	select CRYPTO_BLKCIPHER

	default m

	help

	  Say 'Y' here to use the AMD Geode LX processor on-board AES

	  engine for the CryptoAPI AES alogrithm.



	  To compile this driver as a module, choose M here: the module

	  will be called geode-aes.



endmenu

drivers/crypto/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_CRYPTO_DEV_PADLOCK) += padlock.o

obj-$(CONFIG_CRYPTO_DEV_PADLOCK_AES) += padlock-aes.o

obj-$(CONFIG_CRYPTO_DEV_PADLOCK_SHA) += padlock-sha.o

obj-$(CONFIG_CRYPTO_DEV_GEODE) += geode-aes.o

drivers/crypto/geode-aes.c

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Original line number Diff line number Diff line 
 /* 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);

drivers/crypto/geode-aes.h

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Original line number Diff line number Diff line 
/* Copyright (C) 2003-2006, 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.

 */



#ifndef _GEODE_AES_H_

#define _GEODE_AES_H_



#define AES_KEY_LENGTH 16

#define AES_IV_LENGTH  16



#define AES_MIN_BLOCK_SIZE 16



#define AES_MODE_ECB 0

#define AES_MODE_CBC 1



#define AES_DIR_DECRYPT 0

#define AES_DIR_ENCRYPT 1



#define AES_FLAGS_USRKEY   (1 << 0)

#define AES_FLAGS_COHERENT (1 << 1)



struct geode_aes_op {



	void *src;

	void *dst;



	u32 mode;

	u32 dir;

	u32 flags;

	int len;



	u8 key[AES_KEY_LENGTH];

	u8 iv[AES_IV_LENGTH];

};



unsigned int geode_aes_crypt(struct geode_aes_op *);



#endif