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Commit 74ed87e7 authored by Tero Kristo's avatar Tero Kristo Committed by Herbert Xu
Browse files

crypto: omap - add base support library for common routines 



This contains the generic APIs for aligning SG buffers.

Signed-off-by: default avatarTero Kristo <t-kristo@ti.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 418f2a8c

drivers/crypto/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -314,6 +314,15 @@ config HW_RANDOM_PPC4XX 
	 This option provides the kernel-side support for the TRNG hardware

	 found in the security function of some PowerPC 4xx SoCs.



config CRYPTO_DEV_OMAP

	tristate "Support for OMAP crypto HW accelerators"

	depends on ARCH_OMAP2PLUS

	help

	  OMAP processors have various crypto HW accelerators. Select this if

          you want to use the OMAP modules for any of the crypto algorithms.



if CRYPTO_DEV_OMAP



config CRYPTO_DEV_OMAP_SHAM

	tristate "Support for OMAP MD5/SHA1/SHA2 hw accelerator"

	depends on ARCH_OMAP2PLUS
@@ -351,6 +360,8 @@ config CRYPTO_DEV_OMAP_DES 
	  the ECB and CBC modes of operation are supported by the driver. Also

	  accesses made on unaligned boundaries are supported.



endif # CRYPTO_DEV_OMAP



config CRYPTO_DEV_PICOXCELL

	tristate "Support for picoXcell IPSEC and Layer2 crypto engines"

	depends on (ARCH_PICOXCELL || COMPILE_TEST) && HAVE_CLK

drivers/crypto/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ obj-$(CONFIG_CRYPTO_DEV_MXC_SCC) += mxc-scc.o 
obj-$(CONFIG_CRYPTO_DEV_NIAGARA2) += n2_crypto.o

n2_crypto-y := n2_core.o n2_asm.o

obj-$(CONFIG_CRYPTO_DEV_NX) += nx/

obj-$(CONFIG_CRYPTO_DEV_OMAP) += omap-crypto.o

obj-$(CONFIG_CRYPTO_DEV_OMAP_AES) += omap-aes.o

obj-$(CONFIG_CRYPTO_DEV_OMAP_DES) += omap-des.o

obj-$(CONFIG_CRYPTO_DEV_OMAP_SHAM) += omap-sham.o

drivers/crypto/omap-crypto.c

0 → 100644
+184 −0
Original line number Diff line number Diff line 
/*

 * OMAP Crypto driver common support routines.

 *

 * Copyright (c) 2017 Texas Instruments Incorporated

 *   Tero Kristo <t-kristo@ti.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as published

 * by the Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/scatterlist.h>

#include <crypto/scatterwalk.h>



#include "omap-crypto.h"



static int omap_crypto_copy_sg_lists(int total, int bs,

				     struct scatterlist **sg,

				     struct scatterlist *new_sg, u16 flags)

{

	int n = sg_nents(*sg);

	struct scatterlist *tmp;



	if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) {

		new_sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);

		if (!new_sg)

			return -ENOMEM;



		sg_init_table(new_sg, n);

	}



	tmp = new_sg;



	while (*sg && total) {

		int len = (*sg)->length;



		if (total < len)

			len = total;



		if (len > 0) {

			total -= len;

			sg_set_page(tmp, sg_page(*sg), len, (*sg)->offset);

			if (total <= 0)

				sg_mark_end(tmp);

			tmp = sg_next(tmp);

		}



		*sg = sg_next(*sg);

	}



	*sg = new_sg;



	return 0;

}



static int omap_crypto_copy_sgs(int total, int bs, struct scatterlist **sg,

				struct scatterlist *new_sg, u16 flags)

{

	void *buf;

	int pages;

	int new_len;



	new_len = ALIGN(total, bs);

	pages = get_order(new_len);



	buf = (void *)__get_free_pages(GFP_ATOMIC, pages);

	if (!buf) {

		pr_err("%s: Couldn't allocate pages for unaligned cases.\n",

		       __func__);

		return -ENOMEM;

	}



	if (flags & OMAP_CRYPTO_COPY_DATA) {

		scatterwalk_map_and_copy(buf, *sg, 0, total, 0);

		if (flags & OMAP_CRYPTO_ZERO_BUF)

			memset(buf + total, 0, new_len - total);

	}



	if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY))

		sg_init_table(new_sg, 1);



	sg_set_buf(new_sg, buf, new_len);



	*sg = new_sg;



	return 0;

}



static int omap_crypto_check_sg(struct scatterlist *sg, int total, int bs,

				u16 flags)

{

	int len = 0;

	int num_sg = 0;



	if (!IS_ALIGNED(total, bs))

		return OMAP_CRYPTO_NOT_ALIGNED;



	while (sg) {

		num_sg++;



		if (!IS_ALIGNED(sg->offset, 4))

			return OMAP_CRYPTO_NOT_ALIGNED;

		if (!IS_ALIGNED(sg->length, bs))

			return OMAP_CRYPTO_NOT_ALIGNED;



		len += sg->length;

		sg = sg_next(sg);



		if (len >= total)

			break;

	}



	if ((flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) && num_sg > 1)

		return OMAP_CRYPTO_NOT_ALIGNED;



	if (len != total)

		return OMAP_CRYPTO_BAD_DATA_LENGTH;



	return 0;

}



int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs,

			 struct scatterlist *new_sg, u16 flags,

			 u8 flags_shift, unsigned long *dd_flags)

{

	int ret;



	*dd_flags &= ~(OMAP_CRYPTO_COPY_MASK << flags_shift);



	if (flags & OMAP_CRYPTO_FORCE_COPY)

		ret = OMAP_CRYPTO_NOT_ALIGNED;

	else

		ret = omap_crypto_check_sg(*sg, total, bs, flags);



	if (ret == OMAP_CRYPTO_NOT_ALIGNED) {

		ret = omap_crypto_copy_sgs(total, bs, sg, new_sg, flags);

		if (ret)

			return ret;

		*dd_flags |= OMAP_CRYPTO_DATA_COPIED << flags_shift;

	} else if (ret == OMAP_CRYPTO_BAD_DATA_LENGTH) {

		ret = omap_crypto_copy_sg_lists(total, bs, sg, new_sg, flags);

		if (ret)

			return ret;

		if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY))

			*dd_flags |= OMAP_CRYPTO_SG_COPIED << flags_shift;

	} else if (flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) {

		sg_set_buf(new_sg, sg_virt(*sg), (*sg)->length);

	}



	return 0;

}

EXPORT_SYMBOL_GPL(omap_crypto_align_sg);



void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig,

			 int offset, int len, u8 flags_shift,

			 unsigned long flags)

{

	void *buf;

	int pages;



	flags >>= flags_shift;

	flags &= OMAP_CRYPTO_COPY_MASK;



	if (!flags)

		return;



	buf = sg_virt(sg);

	pages = get_order(len);



	if (orig && (flags & OMAP_CRYPTO_COPY_MASK))

		scatterwalk_map_and_copy(buf, orig, offset, len, 1);



	if (flags & OMAP_CRYPTO_DATA_COPIED)

		free_pages((unsigned long)buf, pages);

	else if (flags & OMAP_CRYPTO_SG_COPIED)

		kfree(sg);

}

EXPORT_SYMBOL_GPL(omap_crypto_cleanup);



MODULE_DESCRIPTION("OMAP crypto support library.");

MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Tero Kristo <t-kristo@ti.com>");

drivers/crypto/omap-crypto.h

0 → 100644
+37 −0
Original line number Diff line number Diff line 
/*

 * OMAP Crypto driver common support routines.

 *

 * Copyright (c) 2017 Texas Instruments Incorporated

 *   Tero Kristo <t-kristo@ti.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as published

 * by the Free Software Foundation.

 */



#ifndef __CRYPTO_OMAP_CRYPTO_H

#define __CRYPTO_OMAP_CRYPTO_H



enum {

	OMAP_CRYPTO_NOT_ALIGNED = 1,

	OMAP_CRYPTO_BAD_DATA_LENGTH,

};



#define OMAP_CRYPTO_DATA_COPIED		BIT(0)

#define OMAP_CRYPTO_SG_COPIED		BIT(1)



#define OMAP_CRYPTO_COPY_MASK		0x3



#define OMAP_CRYPTO_COPY_DATA		BIT(0)

#define OMAP_CRYPTO_FORCE_COPY		BIT(1)

#define OMAP_CRYPTO_ZERO_BUF		BIT(2)

#define OMAP_CRYPTO_FORCE_SINGLE_ENTRY	BIT(3)



int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs,

			 struct scatterlist *new_sg, u16 flags,

			 u8 flags_shift, unsigned long *dd_flags);

void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig,

			 int offset, int len, u8 flags_shift,

			 unsigned long flags);



#endif