/*
 *
 *  sep_crypto.c - Crypto interface structures
 *
 *  Copyright(c) 2009-2011 Intel Corporation. All rights reserved.
 *  Contributions(c) 2009-2010 Discretix. All rights reserved.
 *
 *  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; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 *  more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 *  this program; if not, write to the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *  CONTACTS:
 *
 *  Mark Allyn          mark.a.allyn@intel.com
 *  Jayant Mangalampalli jayant.mangalampalli@intel.com
 *
 *  CHANGES:
 *
 *  2009.06.26  Initial publish
 *  2010.09.14  Upgrade to Medfield
 *  2011.02.22  Enable Kernel Crypto
 *
 */

/* #define DEBUG */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/kdev_t.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/poll.h>
#include <linux/wait.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/crypto.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha.h>
#include <crypto/md5.h>
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/hash.h>
#include "sep_driver_hw_defs.h"
#include "sep_driver_config.h"
#include "sep_driver_api.h"
#include "sep_dev.h"
#include "sep_crypto.h"

#if defined(CONFIG_CRYPTO) || defined(CONFIG_CRYPTO_MODULE)

/* Globals for queuing */
static spinlock_t queue_lock;
static struct crypto_queue sep_queue;

/* Declare of dequeuer */
static void sep_dequeuer(void *data);

/* TESTING */
/**
 *      sep_do_callback
 *      @work: pointer to work_struct
 *      This is what is called by the queue; it is generic so that it
 *      can be used by any type of operation as each different callback
 *      function can use the data parameter in its own way
 */
static void sep_do_callback(struct work_struct *work)
{
        struct sep_work_struct *sep_work = container_of(work,
                struct sep_work_struct, work);
        if (sep_work != NULL) {
                (sep_work->callback)(sep_work->data);
                kfree(sep_work);
        } else {
                pr_debug("sep crypto: do callback - NULL container\n");
        }
}

/**
 *      sep_submit_work
 *      @work_queue: pointer to struct_workqueue
 *      @funct: pointer to function to execute
 *      @data: pointer to data; function will know
 *              how to use it
 *      This is a generic API to submit something to
 *      the queue. The callback function will depend
 *      on what operation is to be done
 */
static int sep_submit_work(struct workqueue_struct *work_queue,
        void(*funct)(void *),
        void *data)
{
        struct sep_work_struct *sep_work;
        int result;

        sep_work = kmalloc(sizeof(struct sep_work_struct), GFP_ATOMIC);

        if (sep_work == NULL) {
                pr_debug("sep crypto: cant allocate work structure\n");
                return -ENOMEM;
        }

        sep_work->callback = funct;
        sep_work->data = data;
        INIT_WORK(&sep_work->work, sep_do_callback);
        result = queue_work(work_queue, &sep_work->work);
        if (!result) {
                pr_debug("sep_crypto: queue_work failed\n");
                return -EINVAL;
        }
        return 0;
}

/**
 *      sep_alloc_sg_buf -
 *      @sep: pointer to struct sep_device
 *      @size: total size of area
 *      @block_size: minimum size of chunks
 *      each page is minimum or modulo this size
 *      @returns: pointer to struct scatterlist for new
 *      buffer
 **/
static struct scatterlist *sep_alloc_sg_buf(
        struct sep_device *sep,
        size_t size,
        size_t block_size)
{
        u32 nbr_pages;
        u32 ct1;
        void *buf;
        size_t current_size;
        size_t real_page_size;

        struct scatterlist *sg, *sg_temp;

        if (size == 0)
                return NULL;

        dev_dbg(&sep->pdev->dev, "sep alloc sg buf\n");

        current_size = 0;
        nbr_pages = 0;
        real_page_size = PAGE_SIZE - (PAGE_SIZE % block_size);
        /**
         * The size of each page must be modulo of the operation
         * block size; increment by the modified page size until
         * the total size is reached, then you have the number of
         * pages
         */
        while (current_size < size) {
                current_size += real_page_size;
                nbr_pages += 1;
        }

        sg = kmalloc_array(nbr_pages, sizeof(struct scatterlist), GFP_ATOMIC);
        if (!sg)
                return NULL;

        sg_init_table(sg, nbr_pages);

        current_size = 0;
        sg_temp = sg;
        for (ct1 = 0; ct1 < nbr_pages; ct1 += 1) {
                buf = (void *)get_zeroed_page(GFP_ATOMIC);
                if (!buf) {
                        dev_warn(&sep->pdev->dev,
                                "Cannot allocate page for new buffer\n");
                        kfree(sg);
                        return NULL;
                }

                sg_set_buf(sg_temp, buf, real_page_size);
                if ((size - current_size) > real_page_size) {
                        sg_temp->length = real_page_size;
                        current_size += real_page_size;
                } else {
                        sg_temp->length = (size - current_size);
                        current_size = size;
                }
                sg_temp = sg_next(sg);
        }
        return sg;
}

/**
 *      sep_free_sg_buf -
 *      @sg: pointer to struct scatterlist; points to area to free
 */
static void sep_free_sg_buf(struct scatterlist *sg)
{
        struct scatterlist *sg_temp = sg;
                while (sg_temp) {
                        free_page((unsigned long)sg_virt(sg_temp));
                        sg_temp = sg_next(sg_temp);
                }
                kfree(sg);
}

/**
 *      sep_copy_sg -
 *      @sep: pointer to struct sep_device
 *      @sg_src: pointer to struct scatterlist for source
 *      @sg_dst: pointer to struct scatterlist for destination
 *      @size: size (in bytes) of data to copy
 *
 *      Copy data from one scatterlist to another; both must
 *      be the same size
 */
static void sep_copy_sg(
        struct sep_device *sep,
        struct scatterlist *sg_src,
        struct scatterlist *sg_dst,
        size_t size)
{
        u32 seg_size;
        u32 in_offset, out_offset;

        u32 count = 0;
        struct scatterlist *sg_src_tmp = sg_src;
        struct scatterlist *sg_dst_tmp = sg_dst;
        in_offset = 0;
        out_offset = 0;

        dev_dbg(&sep->pdev->dev, "sep copy sg\n");

        if ((sg_src == NULL) || (sg_dst == NULL) || (size == 0))
                return;

        dev_dbg(&sep->pdev->dev, "sep copy sg not null\n");

        while (count < size) {
                if ((sg_src_tmp->length - in_offset) >
                        (sg_dst_tmp->length - out_offset))
                        seg_size = sg_dst_tmp->length - out_offset;
                else
                        seg_size = sg_src_tmp->length - in_offset;

                if (seg_size > (size - count))
                        seg_size = (size = count);

                memcpy(sg_virt(sg_dst_tmp) + out_offset,
                        sg_virt(sg_src_tmp) + in_offset,
                        seg_size);

                in_offset += seg_size;
                out_offset += seg_size;
                count += seg_size;

                if (in_offset >= sg_src_tmp->length) {
                        sg_src_tmp = sg_next(sg_src_tmp);
                        in_offset = 0;
                }

                if (out_offset >= sg_dst_tmp->length) {
                        sg_dst_tmp = sg_next(sg_dst_tmp);
                        out_offset = 0;
                }
        }
}

/**
 *      sep_oddball_pages -
 *      @sep: pointer to struct sep_device
 *      @sg: pointer to struct scatterlist - buffer to check
 *      @size: total data size
 *      @blocksize: minimum block size; must be multiples of this size
 *      @to_copy: 1 means do copy, 0 means do not copy
 *      @new_sg: pointer to location to put pointer to new sg area
 *      @returns: 1 if new scatterlist is needed; 0 if not needed;
 *              error value if operation failed
 *
 *      The SEP device requires all pages to be multiples of the
 *      minimum block size appropriate for the operation
 *      This function check all pages; if any are oddball sizes
 *      (not multiple of block sizes), it creates a new scatterlist.
 *      If the to_copy parameter is set to 1, then a scatter list
 *      copy is performed. The pointer to the new scatterlist is
 *      put into the address supplied by the new_sg parameter; if
 *      no new scatterlist is needed, then a NULL is put into
 *      the location at new_sg.
 *
 */
static int sep_oddball_pages(
        struct sep_device *sep,
        struct scatterlist *sg,
        size_t data_size,
        u32 block_size,
        struct scatterlist **new_sg,
        u32 do_copy)
{
        struct scatterlist *sg_temp;
        u32 flag;
        u32 nbr_pages, page_count;

        dev_dbg(&sep->pdev->dev, "sep oddball\n");
        if ((sg == NULL) || (data_size == 0) || (data_size < block_size))
                return 0;

        dev_dbg(&sep->pdev->dev, "sep oddball not null\n");
        flag = 0;
        nbr_pages = 0;
        page_count = 0;
        sg_temp = sg;

        while (sg_temp) {
                nbr_pages += 1;
                sg_temp = sg_next(sg_temp);
        }

        sg_temp = sg;
        while ((sg_temp) && (flag == 0)) {
                page_count += 1;
                if (sg_temp->length % block_size)
                        flag = 1;
                else
                        sg_temp = sg_next(sg_temp);
        }

        /* Do not process if last (or only) page is oddball */
        if (nbr_pages == page_count)
                flag = 0;

        if (flag) {
                dev_dbg(&sep->pdev->dev, "sep oddball processing\n");
                *new_sg = sep_alloc_sg_buf(sep, data_size, block_size);
                if (*new_sg == NULL) {
                        dev_warn(&sep->pdev->dev, "cannot allocate new sg\n");
                        return -ENOMEM;
                }

                if (do_copy)
                        sep_copy_sg(sep, sg, *new_sg, data_size);

                return 1;
        } else {
                return 0;
        }
}

/**
 *      sep_copy_offset_sg -
 *      @sep: pointer to struct sep_device;
 *      @sg: pointer to struct scatterlist
 *      @offset: offset into scatterlist memory
 *      @dst: place to put data
 *      @len: length of data
 *      @returns: number of bytes copies
 *
 *      This copies data from scatterlist buffer
 *      offset from beginning - it is needed for
 *      handling tail data in hash
 */
static size_t sep_copy_offset_sg(
        struct sep_device *sep,
        struct scatterlist *sg,
        u32 offset,
        void *dst,
        u32 len)
{
        size_t page_start;
        size_t page_end;
        size_t offset_within_page;
        size_t length_within_page;
        size_t length_remaining;
        size_t current_offset;

        /* Find which page is beginning of segment */
        page_start = 0;
        page_end = sg->length;
        while ((sg) && (offset > page_end)) {
                page_start += sg->length;
                sg = sg_next(sg);
                if (sg)
                        page_end += sg->length;
        }

        if (sg == NULL)
                return -ENOMEM;

        offset_within_page = offset - page_start;
        if ((sg->length - offset_within_page) >= len) {
                /* All within this page */
                memcpy(dst, sg_virt(sg) + offset_within_page, len);
                return len;
        } else {
                /* Scattered multiple pages */
                current_offset = 0;
                length_remaining = len;
                while ((sg) && (current_offset < len)) {
                        length_within_page = sg->length - offset_within_page;
                        if (length_within_page >= length_remaining) {
                                memcpy(dst+current_offset,
                                        sg_virt(sg) + offset_within_page,
                                        length_remaining);
                                length_remaining = 0;
                                current_offset = len;
                        } else {
                                memcpy(dst+current_offset,
                                        sg_virt(sg) + offset_within_page,
                                        length_within_page);
                                length_remaining -= length_within_page;
                                current_offset += length_within_page;
                                offset_within_page = 0;
                                sg = sg_next(sg);
                        }
                }

                if (sg == NULL)
                        return -ENOMEM;
        }
        return len;
}

/**
 *      partial_overlap -
 *      @src_ptr: source pointer
 *      @dst_ptr: destination pointer
 *      @nbytes: number of bytes
 *      @returns: 0 for success; -1 for failure
 *      We cannot have any partial overlap. Total overlap
 *      where src is the same as dst is okay
 */
static int partial_overlap(void *src_ptr, void *dst_ptr, u32 nbytes)
{
        /* Check for partial overlap */
        if (src_ptr != dst_ptr) {
                if (src_ptr < dst_ptr) {
                        if ((src_ptr + nbytes) > dst_ptr)
                                return -EINVAL;
                } else {
                        if ((dst_ptr + nbytes) > src_ptr)
                                return -EINVAL;
                }
        }

        return 0;
}

/* Debug - prints only if DEBUG is defined */
static void sep_dump_ivs(struct ablkcipher_request *req, char *reason)

        {
        unsigned char *cptr;
        struct sep_aes_internal_context *aes_internal;
        struct sep_des_internal_context *des_internal;
        int ct1;

        struct this_task_ctx *ta_ctx;
        struct crypto_ablkcipher *tfm;
        struct sep_system_ctx *sctx;

        ta_ctx = ablkcipher_request_ctx(req);
        tfm = crypto_ablkcipher_reqtfm(req);
        sctx = crypto_ablkcipher_ctx(tfm);

        dev_dbg(&ta_ctx->sep_used->pdev->dev, "IV DUMP - %s\n", reason);
        if ((ta_ctx->current_request == DES_CBC) &&
                (ta_ctx->des_opmode == SEP_DES_CBC)) {

                des_internal = (struct sep_des_internal_context *)
                        sctx->des_private_ctx.ctx_buf;
                /* print vendor */
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "sep - vendor iv for DES\n");
                cptr = (unsigned char *)des_internal->iv_context;
                for (ct1 = 0; ct1 < crypto_ablkcipher_ivsize(tfm); ct1 += 1)
                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "%02x\n", *(cptr + ct1));

                /* print walk */
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "sep - walk from kernel crypto iv for DES\n");
                cptr = (unsigned char *)ta_ctx->walk.iv;
                for (ct1 = 0; ct1 < crypto_ablkcipher_ivsize(tfm); ct1 += 1)
                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "%02x\n", *(cptr + ct1));
        } else if ((ta_ctx->current_request == AES_CBC) &&
                (ta_ctx->aes_opmode == SEP_AES_CBC)) {

                aes_internal = (struct sep_aes_internal_context *)
                        sctx->aes_private_ctx.cbuff;
                /* print vendor */
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "sep - vendor iv for AES\n");
                cptr = (unsigned char *)aes_internal->aes_ctx_iv;
                for (ct1 = 0; ct1 < crypto_ablkcipher_ivsize(tfm); ct1 += 1)
                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "%02x\n", *(cptr + ct1));

                /* print walk */
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "sep - walk from kernel crypto iv for AES\n");
                cptr = (unsigned char *)ta_ctx->walk.iv;
                for (ct1 = 0; ct1 < crypto_ablkcipher_ivsize(tfm); ct1 += 1)
                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "%02x\n", *(cptr + ct1));
        }
}

/**
 * RFC2451: Weak key check
 * Returns: 1 (weak), 0 (not weak)
 */
static int sep_weak_key(const u8 *key, unsigned int keylen)
{
        static const u8 parity[] = {
        8, 1, 0, 8, 0, 8, 8, 0, 0, 8, 8, 0, 8, 0, 2, 8,
        0, 8, 8, 0, 8, 0, 0, 8, 8,
        0, 0, 8, 0, 8, 8, 3,
        0, 8, 8, 0, 8, 0, 0, 8, 8, 0, 0, 8, 0, 8, 8, 0,
        8, 0, 0, 8, 0, 8, 8, 0, 0,
        8, 8, 0, 8, 0, 0, 8,
        0, 8, 8, 0, 8, 0, 0, 8, 8, 0, 0, 8, 0, 8, 8, 0,
        8, 0, 0, 8, 0, 8, 8, 0, 0,
        8, 8, 0, 8, 0, 0, 8,
        8, 0, 0, 8, 0, 8, 8, 0, 0, 8, 8, 0, 8, 0, 0, 8,
        0, 8, 8, 0, 8, 0, 0, 8, 8,
        0, 0, 8, 0, 8, 8, 0,
        0, 8, 8, 0, 8, 0, 0, 8, 8, 0, 0, 8, 0, 8, 8, 0,
        8, 0, 0, 8, 0, 8, 8, 0, 0,
        8, 8, 0, 8, 0, 0, 8,
        8, 0, 0, 8, 0, 8, 8, 0, 0, 8, 8, 0, 8, 0, 0, 8,
        0, 8, 8, 0, 8, 0, 0, 8, 8,
        0, 0, 8, 0, 8, 8, 0,
        8, 0, 0, 8, 0, 8, 8, 0, 0, 8, 8, 0, 8, 0, 0, 8,
        0, 8, 8, 0, 8, 0, 0, 8, 8,
        0, 0, 8, 0, 8, 8, 0,
        4, 8, 8, 0, 8, 0, 0, 8, 8, 0, 0, 8, 0, 8, 8, 0,
        8, 5, 0, 8, 0, 8, 8, 0, 0,
        8, 8, 0, 8, 0, 6, 8,
        };

        u32 n, w;

        n  = parity[key[0]]; n <<= 4;
        n |= parity[key[1]]; n <<= 4;
        n |= parity[key[2]]; n <<= 4;
        n |= parity[key[3]]; n <<= 4;
        n |= parity[key[4]]; n <<= 4;
        n |= parity[key[5]]; n <<= 4;
        n |= parity[key[6]]; n <<= 4;
        n |= parity[key[7]];
        w = 0x88888888L;

        /* 1 in 10^10 keys passes this test */
        if (!((n - (w >> 3)) & w)) {
                if (n < 0x41415151) {
                        if (n < 0x31312121) {
                                if (n < 0x14141515) {
                                        /* 01 01 01 01 01 01 01 01 */
                                        if (n == 0x11111111)
                                                goto weak;
                                        /* 01 1F 01 1F 01 0E 01 0E */
                                        if (n == 0x13131212)
                                                goto weak;
                                } else {
                                        /* 01 E0 01 E0 01 F1 01 F1 */
                                        if (n == 0x14141515)
                                                goto weak;
                                        /* 01 FE 01 FE 01 FE 01 FE */
                                        if (n == 0x16161616)
                                                goto weak;
                                }
                        } else {
                                if (n < 0x34342525) {
                                        /* 1F 01 1F 01 0E 01 0E 01 */
                                        if (n == 0x31312121)
                                                goto weak;
                                        /* 1F 1F 1F 1F 0E 0E 0E 0E (?) */
                                        if (n == 0x33332222)
                                                goto weak;
                                } else {
                                        /* 1F E0 1F E0 0E F1 0E F1 */
                                        if (n == 0x34342525)
                                                goto weak;
                                        /* 1F FE 1F FE 0E FE 0E FE */
                                        if (n == 0x36362626)
                                                goto weak;
                                }
                        }
                } else {
                        if (n < 0x61616161) {
                                if (n < 0x44445555) {
                                        /* E0 01 E0 01 F1 01 F1 01 */
                                        if (n == 0x41415151)
                                                goto weak;
                                        /* E0 1F E0 1F F1 0E F1 0E */
                                        if (n == 0x43435252)
                                                goto weak;
                                } else {
                                        /* E0 E0 E0 E0 F1 F1 F1 F1 (?) */
                                        if (n == 0x44445555)
                                                goto weak;
                                        /* E0 FE E0 FE F1 FE F1 FE */
                                        if (n == 0x46465656)
                                                goto weak;
                                }
                        } else {
                                if (n < 0x64646565) {
                                        /* FE 01 FE 01 FE 01 FE 01 */
                                        if (n == 0x61616161)
                                                goto weak;
                                        /* FE 1F FE 1F FE 0E FE 0E */
                                        if (n == 0x63636262)
                                                goto weak;
                                } else {
                                        /* FE E0 FE E0 FE F1 FE F1 */
                                        if (n == 0x64646565)
                                                goto weak;
                                        /* FE FE FE FE FE FE FE FE */
                                        if (n == 0x66666666)
                                                goto weak;
                                }
                        }
                }
        }
        return 0;
weak:
        return 1;
}
/**
 *      sep_sg_nents
 */
static u32 sep_sg_nents(struct scatterlist *sg)
{
        u32 ct1 = 0;
        while (sg) {
                ct1 += 1;
                sg = sg_next(sg);
        }

        return ct1;
}

/**
 *      sep_start_msg -
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @returns: offset to place for the next word in the message
 *      Set up pointer in message pool for new message
 */
static u32 sep_start_msg(struct this_task_ctx *ta_ctx)
{
        u32 *word_ptr;
        ta_ctx->msg_len_words = 2;
        ta_ctx->msgptr = ta_ctx->msg;
        memset(ta_ctx->msg, 0, SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);
        ta_ctx->msgptr += sizeof(u32) * 2;
        word_ptr = (u32 *)ta_ctx->msgptr;
        *word_ptr = SEP_START_MSG_TOKEN;
        return sizeof(u32) * 2;
}

/**
 *      sep_end_msg -
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @messages_offset: current message offset
 *      Returns: 0 for success; <0 otherwise
 *      End message; set length and CRC; and
 *      send interrupt to the SEP
 */
static void sep_end_msg(struct this_task_ctx *ta_ctx, u32 msg_offset)
{
        u32 *word_ptr;
        /* Msg size goes into msg after token */
        ta_ctx->msg_len_words = msg_offset / sizeof(u32) + 1;
        word_ptr = (u32 *)ta_ctx->msgptr;
        word_ptr += 1;
        *word_ptr = ta_ctx->msg_len_words;

        /* CRC (currently 0) goes at end of msg */
        word_ptr = (u32 *)(ta_ctx->msgptr + msg_offset);
        *word_ptr = 0;
}

/**
 *      sep_start_inbound_msg -
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @msg_offset: offset to place for the next word in the message
 *      @returns: 0 for success; error value for failure
 *      Set up pointer in message pool for inbound message
 */
static u32 sep_start_inbound_msg(struct this_task_ctx *ta_ctx, u32 *msg_offset)
{
        u32 *word_ptr;
        u32 token;
        u32 error = SEP_OK;

        *msg_offset = sizeof(u32) * 2;
        word_ptr = (u32 *)ta_ctx->msgptr;
        token = *word_ptr;
        ta_ctx->msg_len_words = *(word_ptr + 1);

        if (token != SEP_START_MSG_TOKEN) {
                error = SEP_INVALID_START;
                goto end_function;
        }

end_function:

        return error;
}

/**
 *      sep_write_msg -
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @in_addr: pointer to start of parameter
 *      @size: size of parameter to copy (in bytes)
 *      @max_size: size to move up offset; SEP mesg is in word sizes
 *      @msg_offset: pointer to current offset (is updated)
 *      @byte_array: flag ti indicate whether endian must be changed
 *      Copies data into the message area from caller
 */
static void sep_write_msg(struct this_task_ctx *ta_ctx, void *in_addr,
        u32 size, u32 max_size, u32 *msg_offset, u32 byte_array)
{
        u32 *word_ptr;
        void *void_ptr;
        void_ptr = ta_ctx->msgptr + *msg_offset;
        word_ptr = (u32 *)void_ptr;
        memcpy(void_ptr, in_addr, size);
        *msg_offset += max_size;

        /* Do we need to manipulate endian? */
        if (byte_array) {
                u32 i;
                for (i = 0; i < ((size + 3) / 4); i += 1)
                        *(word_ptr + i) = CHG_ENDIAN(*(word_ptr + i));
        }
}

/**
 *      sep_make_header
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @msg_offset: pointer to current offset (is updated)
 *      @op_code: op code to put into message
 *      Puts op code into message and updates offset
 */
static void sep_make_header(struct this_task_ctx *ta_ctx, u32 *msg_offset,
                            u32 op_code)
{
        u32 *word_ptr;

        *msg_offset = sep_start_msg(ta_ctx);
        word_ptr = (u32 *)(ta_ctx->msgptr + *msg_offset);
        *word_ptr = op_code;
        *msg_offset += sizeof(u32);
}



/**
 *      sep_read_msg -
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @in_addr: pointer to start of parameter
 *      @size: size of parameter to copy (in bytes)
 *      @max_size: size to move up offset; SEP mesg is in word sizes
 *      @msg_offset: pointer to current offset (is updated)
 *      @byte_array: flag ti indicate whether endian must be changed
 *      Copies data out of the message area to caller
 */
static void sep_read_msg(struct this_task_ctx *ta_ctx, void *in_addr,
        u32 size, u32 max_size, u32 *msg_offset, u32 byte_array)
{
        u32 *word_ptr;
        void *void_ptr;
        void_ptr = ta_ctx->msgptr + *msg_offset;
        word_ptr = (u32 *)void_ptr;

        /* Do we need to manipulate endian? */
        if (byte_array) {
                u32 i;
                for (i = 0; i < ((size + 3) / 4); i += 1)
                        *(word_ptr + i) = CHG_ENDIAN(*(word_ptr + i));
        }

        memcpy(in_addr, void_ptr, size);
        *msg_offset += max_size;
}

/**
 *      sep_verify_op -
 *      @ta_ctx: pointer to struct this_task_ctx
 *      @op_code: expected op_code
 *      @msg_offset: pointer to current offset (is updated)
 *      @returns: 0 for success; error for failure
 */
static u32 sep_verify_op(struct this_task_ctx *ta_ctx, u32 op_code,
                         u32 *msg_offset)
{
        u32 error;
        u32 in_ary[2];

        struct sep_device *sep = ta_ctx->sep_used;

        dev_dbg(&sep->pdev->dev, "dumping return message\n");
        error = sep_start_inbound_msg(ta_ctx, msg_offset);
        if (error) {
                dev_warn(&sep->pdev->dev,
                        "sep_start_inbound_msg error\n");
                return error;
        }

        sep_read_msg(ta_ctx, in_ary, sizeof(u32) * 2, sizeof(u32) * 2,
                msg_offset, 0);

        if (in_ary[0] != op_code) {
                dev_warn(&sep->pdev->dev,
                        "sep got back wrong opcode\n");
                dev_warn(&sep->pdev->dev,
                        "got back %x; expected %x\n",
                        in_ary[0], op_code);
                return SEP_WRONG_OPCODE;
        }

        if (in_ary[1] != SEP_OK) {
                dev_warn(&sep->pdev->dev,
                        "sep execution error\n");
                dev_warn(&sep->pdev->dev,
                        "got back %x; expected %x\n",
                        in_ary[1], SEP_OK);
                return in_ary[0];
        }

return 0;
}

/**
 * sep_read_context -
 * @ta_ctx: pointer to struct this_task_ctx
 * @msg_offset: point to current place in SEP msg; is updated
 * @dst: pointer to place to put the context
 * @len: size of the context structure (differs for crypro/hash)
 * This function reads the context from the msg area
 * There is a special way the vendor needs to have the maximum
 * length calculated so that the msg_offset is updated properly;
 * it skips over some words in the msg area depending on the size
 * of the context
 */
static void sep_read_context(struct this_task_ctx *ta_ctx, u32 *msg_offset,
        void *dst, u32 len)
{
        u32 max_length = ((len + 3) / sizeof(u32)) * sizeof(u32);
        sep_read_msg(ta_ctx, dst, len, max_length, msg_offset, 0);
}

/**
 * sep_write_context -
 * @ta_ctx: pointer to struct this_task_ctx
 * @msg_offset: point to current place in SEP msg; is updated
 * @src: pointer to the current context
 * @len: size of the context structure (differs for crypro/hash)
 * This function writes the context to the msg area
 * There is a special way the vendor needs to have the maximum
 * length calculated so that the msg_offset is updated properly;
 * it skips over some words in the msg area depending on the size
 * of the context
 */
static void sep_write_context(struct this_task_ctx *ta_ctx, u32 *msg_offset,
        void *src, u32 len)
{
        u32 max_length = ((len + 3) / sizeof(u32)) * sizeof(u32);
        sep_write_msg(ta_ctx, src, len, max_length, msg_offset, 0);
}

/**
 * sep_clear_out -
 * @ta_ctx: pointer to struct this_task_ctx
 * Clear out crypto related values in sep device structure
 * to enable device to be used by anyone; either kernel
 * crypto or userspace app via middleware
 */
static void sep_clear_out(struct this_task_ctx *ta_ctx)
{
        if (ta_ctx->src_sg_hold) {
                sep_free_sg_buf(ta_ctx->src_sg_hold);
                ta_ctx->src_sg_hold = NULL;
        }

        if (ta_ctx->dst_sg_hold) {
                sep_free_sg_buf(ta_ctx->dst_sg_hold);
                ta_ctx->dst_sg_hold = NULL;
        }

        ta_ctx->src_sg = NULL;
        ta_ctx->dst_sg = NULL;

        sep_free_dma_table_data_handler(ta_ctx->sep_used, &ta_ctx->dma_ctx);

        if (ta_ctx->i_own_sep) {
                /**
                 * The following unlocks the sep and makes it available
                 * to any other application
                 * First, null out crypto entries in sep before releasing it
                 */
                ta_ctx->sep_used->current_hash_req = NULL;
                ta_ctx->sep_used->current_cypher_req = NULL;
                ta_ctx->sep_used->current_request = 0;
                ta_ctx->sep_used->current_hash_stage = 0;
                ta_ctx->sep_used->ta_ctx = NULL;
                ta_ctx->sep_used->in_kernel = 0;

                ta_ctx->call_status.status = 0;

                /* Remove anything confidential */
                memset(ta_ctx->sep_used->shared_addr, 0,
                        SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

                sep_queue_status_remove(ta_ctx->sep_used, &ta_ctx->queue_elem);

#ifdef SEP_ENABLE_RUNTIME_PM
                ta_ctx->sep_used->in_use = 0;
                pm_runtime_mark_last_busy(&ta_ctx->sep_used->pdev->dev);
                pm_runtime_put_autosuspend(&ta_ctx->sep_used->pdev->dev);
#endif

                clear_bit(SEP_WORKING_LOCK_BIT,
                        &ta_ctx->sep_used->in_use_flags);
                ta_ctx->sep_used->pid_doing_transaction = 0;

                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "[PID%d] waking up next transaction\n",
                        current->pid);

                clear_bit(SEP_TRANSACTION_STARTED_LOCK_BIT,
                        &ta_ctx->sep_used->in_use_flags);
                wake_up(&ta_ctx->sep_used->event_transactions);

                ta_ctx->i_own_sep = 0;
        }
}

/**
  * Release crypto infrastructure from EINPROGRESS and
  * clear sep_dev so that SEP is available to anyone
  */
static void sep_crypto_release(struct sep_system_ctx *sctx,
        struct this_task_ctx *ta_ctx, u32 error)
{
        struct ahash_request *hash_req = ta_ctx->current_hash_req;
        struct ablkcipher_request *cypher_req =
                ta_ctx->current_cypher_req;
        struct sep_device *sep = ta_ctx->sep_used;

        sep_clear_out(ta_ctx);

        /**
         * This may not yet exist depending when we
         * chose to bail out. If it does exist, set
         * it to 1
         */
        if (ta_ctx->are_we_done_yet != NULL)
                *ta_ctx->are_we_done_yet = 1;

        if (cypher_req != NULL) {
                if ((sctx->key_sent == 1) ||
                        ((error != 0) && (error != -EINPROGRESS))) {
                        if (cypher_req->base.complete == NULL) {
                                dev_dbg(&sep->pdev->dev,
                                        "release is null for cypher!");
                        } else {
                                cypher_req->base.complete(
                                        &cypher_req->base, error);
                        }
                }
        }

        if (hash_req != NULL) {
                if (hash_req->base.complete == NULL) {
                        dev_dbg(&sep->pdev->dev,
                                "release is null for hash!");
                } else {
                        hash_req->base.complete(
                                &hash_req->base, error);
                }

        }
}

/**
 *      This is where we grab the sep itself and tell it to do something.
 *      It will sleep if the sep is currently busy
 *      and it will return 0 if sep is now ours; error value if there
 *      were problems
 */
static int sep_crypto_take_sep(struct this_task_ctx *ta_ctx)
{
        struct sep_device *sep = ta_ctx->sep_used;
        int result;
        struct sep_msgarea_hdr *my_msg_header;

        my_msg_header = (struct sep_msgarea_hdr *)ta_ctx->msg;

        /* add to status queue */
        ta_ctx->queue_elem = sep_queue_status_add(sep, my_msg_header->opcode,
                ta_ctx->nbytes, current->pid,
                current->comm, sizeof(current->comm));

        if (!ta_ctx->queue_elem) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] updating queue status error\n", current->pid);
                return -EINVAL;
        }

        /* get the device; this can sleep */
        result = sep_wait_transaction(sep);
        if (result)
                return result;

        if (sep_dev->power_save_setup == 1)
                pm_runtime_get_sync(&sep_dev->pdev->dev);

        /* Copy in the message */
        memcpy(sep->shared_addr, ta_ctx->msg,
                SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        /* Copy in the dcb information if there is any */
        if (ta_ctx->dcb_region) {
                result = sep_activate_dcb_dmatables_context(sep,
                        &ta_ctx->dcb_region, &ta_ctx->dmatables_region,
                        ta_ctx->dma_ctx);
                if (result)
                        return result;
        }

        /* Mark the device so we know how to finish the job in the tasklet */
        if (ta_ctx->current_hash_req)
                sep->current_hash_req = ta_ctx->current_hash_req;
        else
                sep->current_cypher_req = ta_ctx->current_cypher_req;

        sep->current_request = ta_ctx->current_request;
        sep->current_hash_stage = ta_ctx->current_hash_stage;
        sep->ta_ctx = ta_ctx;
        sep->in_kernel = 1;
        ta_ctx->i_own_sep = 1;

        /* need to set bit first to avoid race condition with interrupt */
        set_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET, &ta_ctx->call_status.status);

        result = sep_send_command_handler(sep);

        dev_dbg(&sep->pdev->dev, "[PID%d]: sending command to the sep\n",
                current->pid);

        if (!result)
                dev_dbg(&sep->pdev->dev, "[PID%d]: command sent okay\n",
                        current->pid);
        else {
                dev_dbg(&sep->pdev->dev, "[PID%d]: cant send command\n",
                        current->pid);
                clear_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET,
                        &ta_ctx->call_status.status);
        }

        return result;
}

/**
 * This function sets things up for a crypto data block process
 * This does all preparation, but does not try to grab the
 * sep
 * @req: pointer to struct ablkcipher_request
 * returns: 0 if all went well, non zero if error
 */
static int sep_crypto_block_data(struct ablkcipher_request *req)
{

        int int_error;
        u32 msg_offset;
        static u32 msg[10];
        void *src_ptr;
        void *dst_ptr;

        static char small_buf[100];
        ssize_t copy_result;
        int result;

        struct scatterlist *new_sg;
        struct this_task_ctx *ta_ctx;
        struct crypto_ablkcipher *tfm;
        struct sep_system_ctx *sctx;

        struct sep_des_internal_context *des_internal;
        struct sep_aes_internal_context *aes_internal;

        ta_ctx = ablkcipher_request_ctx(req);
        tfm = crypto_ablkcipher_reqtfm(req);
        sctx = crypto_ablkcipher_ctx(tfm);

        /* start the walk on scatterlists */
        ablkcipher_walk_init(&ta_ctx->walk, req->src, req->dst, req->nbytes);
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "sep crypto block data size of %x\n",
                req->nbytes);

        int_error = ablkcipher_walk_phys(req, &ta_ctx->walk);
        if (int_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "walk phys error %x\n",
                        int_error);
                return -ENOMEM;
        }

        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "crypto block: src is %lx dst is %lx\n",
                (unsigned long)req->src, (unsigned long)req->dst);

        /* Make sure all pages are even block */
        int_error = sep_oddball_pages(ta_ctx->sep_used, req->src,
                req->nbytes, ta_ctx->walk.blocksize, &new_sg, 1);

        if (int_error < 0) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "oddball page error\n");
                return -ENOMEM;
        } else if (int_error == 1) {
                ta_ctx->src_sg = new_sg;
                ta_ctx->src_sg_hold = new_sg;
        } else {
                ta_ctx->src_sg = req->src;
                ta_ctx->src_sg_hold = NULL;
        }

        int_error = sep_oddball_pages(ta_ctx->sep_used, req->dst,
                req->nbytes, ta_ctx->walk.blocksize, &new_sg, 0);

        if (int_error < 0) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "walk phys error %x\n",
                        int_error);
                return -ENOMEM;
        } else if (int_error == 1) {
                ta_ctx->dst_sg = new_sg;
                ta_ctx->dst_sg_hold = new_sg;
        } else {
                ta_ctx->dst_sg = req->dst;
                ta_ctx->dst_sg_hold = NULL;
        }

        /* set nbytes for queue status */
        ta_ctx->nbytes = req->nbytes;

        /* Key already done; this is for data */
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "sending data\n");

        /* check for valid data and proper spacing */
        src_ptr = sg_virt(ta_ctx->src_sg);
        dst_ptr = sg_virt(ta_ctx->dst_sg);

        if (!src_ptr || !dst_ptr ||
                (ta_ctx->current_cypher_req->nbytes %
                crypto_ablkcipher_blocksize(tfm))) {

                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "cipher block size odd\n");
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "cipher block size is %x\n",
                        crypto_ablkcipher_blocksize(tfm));
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "cipher data size is %x\n",
                        ta_ctx->current_cypher_req->nbytes);
                return -EINVAL;
        }

        if (partial_overlap(src_ptr, dst_ptr,
                ta_ctx->current_cypher_req->nbytes)) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "block partial overlap\n");
                return -EINVAL;
        }

        /* Put together the message */
        sep_make_header(ta_ctx, &msg_offset, ta_ctx->block_opcode);

        /* If des, and size is 1 block, put directly in msg */
        if ((ta_ctx->block_opcode == SEP_DES_BLOCK_OPCODE) &&
                (req->nbytes == crypto_ablkcipher_blocksize(tfm))) {

                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "writing out one block des\n");

                copy_result = sg_copy_to_buffer(
                        ta_ctx->src_sg, sep_sg_nents(ta_ctx->src_sg),
                        small_buf, crypto_ablkcipher_blocksize(tfm));

                if (copy_result != crypto_ablkcipher_blocksize(tfm)) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "des block copy failed\n");
                        return -ENOMEM;
                }

                /* Put data into message */
                sep_write_msg(ta_ctx, small_buf,
                        crypto_ablkcipher_blocksize(tfm),
                        crypto_ablkcipher_blocksize(tfm) * 2,
                        &msg_offset, 1);

                /* Put size into message */
                sep_write_msg(ta_ctx, &req->nbytes,
                        sizeof(u32), sizeof(u32), &msg_offset, 0);
        } else {
                /* Otherwise, fill out dma tables */
                ta_ctx->dcb_input_data.app_in_address = src_ptr;
                ta_ctx->dcb_input_data.data_in_size = req->nbytes;
                ta_ctx->dcb_input_data.app_out_address = dst_ptr;
                ta_ctx->dcb_input_data.block_size =
                        crypto_ablkcipher_blocksize(tfm);
                ta_ctx->dcb_input_data.tail_block_size = 0;
                ta_ctx->dcb_input_data.is_applet = 0;
                ta_ctx->dcb_input_data.src_sg = ta_ctx->src_sg;
                ta_ctx->dcb_input_data.dst_sg = ta_ctx->dst_sg;

                result = sep_create_dcb_dmatables_context_kernel(
                        ta_ctx->sep_used,
                        &ta_ctx->dcb_region,
                        &ta_ctx->dmatables_region,
                        &ta_ctx->dma_ctx,
                        &ta_ctx->dcb_input_data,
                        1);
                if (result) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "crypto dma table create failed\n");
                        return -EINVAL;
                }

                /* Portion of msg is nulled (no data) */
                msg[0] = (u32)0;
                msg[1] = (u32)0;
                msg[2] = (u32)0;
                msg[3] = (u32)0;
                msg[4] = (u32)0;
                sep_write_msg(ta_ctx, (void *)msg, sizeof(u32) * 5,
                        sizeof(u32) * 5, &msg_offset, 0);
                }

        /**
         * Before we write the message, we need to overwrite the
         * vendor's IV with the one from our own ablkcipher walk
         * iv because this is needed for dm-crypt
         */
        sep_dump_ivs(req, "sending data block to sep\n");
        if ((ta_ctx->current_request == DES_CBC) &&
                (ta_ctx->des_opmode == SEP_DES_CBC)) {

                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "overwrite vendor iv on DES\n");
                des_internal = (struct sep_des_internal_context *)
                        sctx->des_private_ctx.ctx_buf;
                memcpy((void *)des_internal->iv_context,
                        ta_ctx->walk.iv, crypto_ablkcipher_ivsize(tfm));
        } else if ((ta_ctx->current_request == AES_CBC) &&
                (ta_ctx->aes_opmode == SEP_AES_CBC)) {

                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "overwrite vendor iv on AES\n");
                aes_internal = (struct sep_aes_internal_context *)
                        sctx->aes_private_ctx.cbuff;
                memcpy((void *)aes_internal->aes_ctx_iv,
                        ta_ctx->walk.iv, crypto_ablkcipher_ivsize(tfm));
        }

        /* Write context into message */
        if (ta_ctx->block_opcode == SEP_DES_BLOCK_OPCODE) {
                sep_write_context(ta_ctx, &msg_offset,
                        &sctx->des_private_ctx,
                        sizeof(struct sep_des_private_context));
        } else {
                sep_write_context(ta_ctx, &msg_offset,
                        &sctx->aes_private_ctx,
                        sizeof(struct sep_aes_private_context));
        }

        /* conclude message */
        sep_end_msg(ta_ctx, msg_offset);

        /* Parent (caller) is now ready to tell the sep to do ahead */
        return 0;
}


/**
 * This function sets things up for a crypto key submit process
 * This does all preparation, but does not try to grab the
 * sep
 * @req: pointer to struct ablkcipher_request
 * returns: 0 if all went well, non zero if error
 */
static int sep_crypto_send_key(struct ablkcipher_request *req)
{

        int int_error;
        u32 msg_offset;
        static u32 msg[10];

        u32 max_length;
        struct this_task_ctx *ta_ctx;
        struct crypto_ablkcipher *tfm;
        struct sep_system_ctx *sctx;

        ta_ctx = ablkcipher_request_ctx(req);
        tfm = crypto_ablkcipher_reqtfm(req);
        sctx = crypto_ablkcipher_ctx(tfm);

        dev_dbg(&ta_ctx->sep_used->pdev->dev, "sending key\n");

        /* start the walk on scatterlists */
        ablkcipher_walk_init(&ta_ctx->walk, req->src, req->dst, req->nbytes);
        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "sep crypto block data size of %x\n", req->nbytes);

        int_error = ablkcipher_walk_phys(req, &ta_ctx->walk);
        if (int_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "walk phys error %x\n",
                        int_error);
                return -ENOMEM;
        }

        /* check iv */
        if ((ta_ctx->current_request == DES_CBC) &&
                (ta_ctx->des_opmode == SEP_DES_CBC)) {
                if (!ta_ctx->walk.iv) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev, "no iv found\n");
                        return -EINVAL;
                }

                memcpy(ta_ctx->iv, ta_ctx->walk.iv, SEP_DES_IV_SIZE_BYTES);
        }

        if ((ta_ctx->current_request == AES_CBC) &&
                (ta_ctx->aes_opmode == SEP_AES_CBC)) {
                if (!ta_ctx->walk.iv) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev, "no iv found\n");
                        return -EINVAL;
                }

                memcpy(ta_ctx->iv, ta_ctx->walk.iv, SEP_AES_IV_SIZE_BYTES);
        }

        /* put together message to SEP */
        /* Start with op code */
        sep_make_header(ta_ctx, &msg_offset, ta_ctx->init_opcode);

        /* now deal with IV */
        if (ta_ctx->init_opcode == SEP_DES_INIT_OPCODE) {
                if (ta_ctx->des_opmode == SEP_DES_CBC) {
                        sep_write_msg(ta_ctx, ta_ctx->iv,
                                SEP_DES_IV_SIZE_BYTES, sizeof(u32) * 4,
                                &msg_offset, 1);
                } else {
                        /* Skip if ECB */
                        msg_offset += 4 * sizeof(u32);
                }
        } else {
                max_length = ((SEP_AES_IV_SIZE_BYTES + 3) /
                        sizeof(u32)) * sizeof(u32);
                if (ta_ctx->aes_opmode == SEP_AES_CBC) {
                        sep_write_msg(ta_ctx, ta_ctx->iv,
                                SEP_AES_IV_SIZE_BYTES, max_length,
                                &msg_offset, 1);
                } else {
                                /* Skip if ECB */
                                msg_offset += max_length;
                        }
                }

        /* load the key */
        if (ta_ctx->init_opcode == SEP_DES_INIT_OPCODE) {
                sep_write_msg(ta_ctx, (void *)&sctx->key.des.key1,
                        sizeof(u32) * 8, sizeof(u32) * 8,
                        &msg_offset, 1);

                msg[0] = (u32)sctx->des_nbr_keys;
                msg[1] = (u32)ta_ctx->des_encmode;
                msg[2] = (u32)ta_ctx->des_opmode;

                sep_write_msg(ta_ctx, (void *)msg,
                        sizeof(u32) * 3, sizeof(u32) * 3,
                        &msg_offset, 0);
        } else {
                sep_write_msg(ta_ctx, (void *)&sctx->key.aes,
                        sctx->keylen,
                        SEP_AES_MAX_KEY_SIZE_BYTES,
                        &msg_offset, 1);

                msg[0] = (u32)sctx->aes_key_size;
                msg[1] = (u32)ta_ctx->aes_encmode;
                msg[2] = (u32)ta_ctx->aes_opmode;
                msg[3] = (u32)0; /* Secret key is not used */
                sep_write_msg(ta_ctx, (void *)msg,
                        sizeof(u32) * 4, sizeof(u32) * 4,
                        &msg_offset, 0);
        }

        /* conclude message */
        sep_end_msg(ta_ctx, msg_offset);

        /* Parent (caller) is now ready to tell the sep to do ahead */
        return 0;
}


/* This needs to be run as a work queue as it can be put asleep */
static void sep_crypto_block(void *data)
{
        unsigned long end_time;

        int result;

        struct ablkcipher_request *req;
        struct this_task_ctx *ta_ctx;
        struct crypto_ablkcipher *tfm;
        struct sep_system_ctx *sctx;
        int are_we_done_yet;

        req = (struct ablkcipher_request *)data;
        ta_ctx = ablkcipher_request_ctx(req);
        tfm = crypto_ablkcipher_reqtfm(req);
        sctx = crypto_ablkcipher_ctx(tfm);

        ta_ctx->are_we_done_yet = &are_we_done_yet;

        pr_debug("sep_crypto_block\n");
        pr_debug("tfm is %p sctx is %p ta_ctx is %p\n",
                tfm, sctx, ta_ctx);
        pr_debug("key_sent is %d\n", sctx->key_sent);

        /* do we need to send the key */
        if (sctx->key_sent == 0) {
                are_we_done_yet = 0;
                result = sep_crypto_send_key(req); /* prep to send key */
                if (result != 0) {
                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "could not prep key %x\n", result);
                        sep_crypto_release(sctx, ta_ctx, result);
                        return;
                }

                result = sep_crypto_take_sep(ta_ctx);
                if (result) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "sep_crypto_take_sep for key send failed\n");
                        sep_crypto_release(sctx, ta_ctx, result);
                        return;
                }

                /* now we sit and wait up to a fixed time for completion */
                end_time = jiffies + (WAIT_TIME * HZ);
                while ((time_before(jiffies, end_time)) &&
                        (are_we_done_yet == 0))
                        schedule();

                /* Done waiting; still not done yet? */
                if (are_we_done_yet == 0) {
                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "Send key job never got done\n");
                        sep_crypto_release(sctx, ta_ctx, -EINVAL);
                        return;
                }

                /* Set the key sent variable so this can be skipped later */
                sctx->key_sent = 1;
        }

        /* Key sent (or maybe not if we did not have to), now send block */
        are_we_done_yet = 0;

        result = sep_crypto_block_data(req);

        if (result != 0) {
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "could prep not send block %x\n", result);
                sep_crypto_release(sctx, ta_ctx, result);
                return;
        }

        result = sep_crypto_take_sep(ta_ctx);
        if (result) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "sep_crypto_take_sep for block send failed\n");
                sep_crypto_release(sctx, ta_ctx, result);
                return;
        }

        /* now we sit and wait up to a fixed time for completion */
        end_time = jiffies + (WAIT_TIME * HZ);
        while ((time_before(jiffies, end_time)) && (are_we_done_yet == 0))
                schedule();

        /* Done waiting; still not done yet? */
        if (are_we_done_yet == 0) {
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "Send block job never got done\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

        /* That's it; entire thing done, get out of queue */

        pr_debug("crypto_block leaving\n");
        pr_debug("tfm is %p sctx is %p ta_ctx is %p\n", tfm, sctx, ta_ctx);
}

/**
 * Post operation (after interrupt) for crypto block
 */
static u32 crypto_post_op(struct sep_device *sep)
{
        /* HERE */
        u32 u32_error;
        u32 msg_offset;

        ssize_t copy_result;
        static char small_buf[100];

        struct ablkcipher_request *req;
        struct this_task_ctx *ta_ctx;
        struct sep_system_ctx *sctx;
        struct crypto_ablkcipher *tfm;

        struct sep_des_internal_context *des_internal;
        struct sep_aes_internal_context *aes_internal;

        if (!sep->current_cypher_req)
                return -EINVAL;

        /* hold req since we need to submit work after clearing sep */
        req = sep->current_cypher_req;

        ta_ctx = ablkcipher_request_ctx(sep->current_cypher_req);
        tfm = crypto_ablkcipher_reqtfm(sep->current_cypher_req);
        sctx = crypto_ablkcipher_ctx(tfm);

        pr_debug("crypto_post op\n");
        pr_debug("key_sent is %d tfm is %p sctx is %p ta_ctx is %p\n",
                sctx->key_sent, tfm, sctx, ta_ctx);

        dev_dbg(&ta_ctx->sep_used->pdev->dev, "crypto post_op\n");
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "crypto post_op message dump\n");

        /* first bring msg from shared area to local area */
        memcpy(ta_ctx->msg, sep->shared_addr,
                SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        /* Is this the result of performing init (key to SEP */
        if (sctx->key_sent == 0) {

                /* Did SEP do it okay */
                u32_error = sep_verify_op(ta_ctx, ta_ctx->init_opcode,
                        &msg_offset);
                if (u32_error) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "aes init error %x\n", u32_error);
                        sep_crypto_release(sctx, ta_ctx, u32_error);
                        return u32_error;
                        }

                /* Read Context */
                if (ta_ctx->init_opcode == SEP_DES_INIT_OPCODE) {
                        sep_read_context(ta_ctx, &msg_offset,
                        &sctx->des_private_ctx,
                        sizeof(struct sep_des_private_context));
                } else {
                        sep_read_context(ta_ctx, &msg_offset,
                        &sctx->aes_private_ctx,
                        sizeof(struct sep_aes_private_context));
                }

                sep_dump_ivs(req, "after sending key to sep\n");

                /* key sent went okay; release sep, and set are_we_done_yet */
                sctx->key_sent = 1;
                sep_crypto_release(sctx, ta_ctx, -EINPROGRESS);

        } else {

                /**
                 * This is the result of a block request
                 */
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "crypto_post_op block response\n");

                u32_error = sep_verify_op(ta_ctx, ta_ctx->block_opcode,
                        &msg_offset);

                if (u32_error) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "sep block error %x\n", u32_error);
                        sep_crypto_release(sctx, ta_ctx, u32_error);
                        return -EINVAL;
                        }

                if (ta_ctx->block_opcode == SEP_DES_BLOCK_OPCODE) {

                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "post op for DES\n");

                        /* special case for 1 block des */
                        if (sep->current_cypher_req->nbytes ==
                                crypto_ablkcipher_blocksize(tfm)) {

                                sep_read_msg(ta_ctx, small_buf,
                                        crypto_ablkcipher_blocksize(tfm),
                                        crypto_ablkcipher_blocksize(tfm) * 2,
                                        &msg_offset, 1);

                                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                        "reading in block des\n");

                                copy_result = sg_copy_from_buffer(
                                        ta_ctx->dst_sg,
                                        sep_sg_nents(ta_ctx->dst_sg),
                                        small_buf,
                                        crypto_ablkcipher_blocksize(tfm));

                                if (copy_result !=
                                        crypto_ablkcipher_blocksize(tfm)) {

                                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                                "des block copy failed\n");
                                        sep_crypto_release(sctx, ta_ctx,
                                                -ENOMEM);
                                        return -ENOMEM;
                                }
                        }

                        /* Read Context */
                        sep_read_context(ta_ctx, &msg_offset,
                                &sctx->des_private_ctx,
                                sizeof(struct sep_des_private_context));
                } else {

                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "post op for AES\n");

                        /* Skip the MAC Output */
                        msg_offset += (sizeof(u32) * 4);

                        /* Read Context */
                        sep_read_context(ta_ctx, &msg_offset,
                                &sctx->aes_private_ctx,
                                sizeof(struct sep_aes_private_context));
                }

                /* Copy to correct sg if this block had oddball pages */
                if (ta_ctx->dst_sg_hold)
                        sep_copy_sg(ta_ctx->sep_used,
                                ta_ctx->dst_sg,
                                ta_ctx->current_cypher_req->dst,
                                ta_ctx->current_cypher_req->nbytes);

                /**
                 * Copy the iv's back to the walk.iv
                 * This is required for dm_crypt
                 */
                sep_dump_ivs(req, "got data block from sep\n");
                if ((ta_ctx->current_request == DES_CBC) &&
                        (ta_ctx->des_opmode == SEP_DES_CBC)) {

                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "returning result iv to walk on DES\n");
                        des_internal = (struct sep_des_internal_context *)
                                sctx->des_private_ctx.ctx_buf;
                        memcpy(ta_ctx->walk.iv,
                                (void *)des_internal->iv_context,
                                crypto_ablkcipher_ivsize(tfm));
                } else if ((ta_ctx->current_request == AES_CBC) &&
                        (ta_ctx->aes_opmode == SEP_AES_CBC)) {

                        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                                "returning result iv to walk on AES\n");
                        aes_internal = (struct sep_aes_internal_context *)
                                sctx->aes_private_ctx.cbuff;
                        memcpy(ta_ctx->walk.iv,
                                (void *)aes_internal->aes_ctx_iv,
                                crypto_ablkcipher_ivsize(tfm));
                }

                /* finished, release everything */
                sep_crypto_release(sctx, ta_ctx, 0);
        }
        pr_debug("crypto_post_op done\n");
        pr_debug("key_sent is %d tfm is %p sctx is %p ta_ctx is %p\n",
                sctx->key_sent, tfm, sctx, ta_ctx);

        return 0;
}

static u32 hash_init_post_op(struct sep_device *sep)
{
        u32 u32_error;
        u32 msg_offset;
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(sep->current_hash_req);
        struct this_task_ctx *ta_ctx = ahash_request_ctx(sep->current_hash_req);
        struct sep_system_ctx *sctx = crypto_ahash_ctx(tfm);
        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "hash init post op\n");

        /* first bring msg from shared area to local area */
        memcpy(ta_ctx->msg, sep->shared_addr,
                SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        u32_error = sep_verify_op(ta_ctx, SEP_HASH_INIT_OPCODE,
                &msg_offset);

        if (u32_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "hash init error %x\n",
                        u32_error);
                sep_crypto_release(sctx, ta_ctx, u32_error);
                return u32_error;
                }

        /* Read Context */
        sep_read_context(ta_ctx, &msg_offset,
                &sctx->hash_private_ctx,
                sizeof(struct sep_hash_private_context));

        /* Signal to crypto infrastructure and clear out */
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "hash init post op done\n");
        sep_crypto_release(sctx, ta_ctx, 0);
        return 0;
}

static u32 hash_update_post_op(struct sep_device *sep)
{
        u32 u32_error;
        u32 msg_offset;
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(sep->current_hash_req);
        struct this_task_ctx *ta_ctx = ahash_request_ctx(sep->current_hash_req);
        struct sep_system_ctx *sctx = crypto_ahash_ctx(tfm);
        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "hash update post op\n");

        /* first bring msg from shared area to local area */
        memcpy(ta_ctx->msg, sep->shared_addr,
                SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        u32_error = sep_verify_op(ta_ctx, SEP_HASH_UPDATE_OPCODE,
                &msg_offset);

        if (u32_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "hash init error %x\n",
                        u32_error);
                sep_crypto_release(sctx, ta_ctx, u32_error);
                return u32_error;
                }

        /* Read Context */
        sep_read_context(ta_ctx, &msg_offset,
                &sctx->hash_private_ctx,
                sizeof(struct sep_hash_private_context));

        /**
         * Following is only for finup; if we just completed the
         * data portion of finup, we now need to kick off the
         * finish portion of finup.
         */

        if (ta_ctx->sep_used->current_hash_stage == HASH_FINUP_DATA) {

                /* first reset stage to HASH_FINUP_FINISH */
                ta_ctx->sep_used->current_hash_stage = HASH_FINUP_FINISH;

                /* now enqueue the finish operation */
                spin_lock_irq(&queue_lock);
                u32_error = crypto_enqueue_request(&sep_queue,
                        &ta_ctx->sep_used->current_hash_req->base);
                spin_unlock_irq(&queue_lock);

                if ((u32_error != 0) && (u32_error != -EINPROGRESS)) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "spe cypher post op cant queue\n");
                        sep_crypto_release(sctx, ta_ctx, u32_error);
                        return u32_error;
                }

                /* schedule the data send */
                u32_error = sep_submit_work(ta_ctx->sep_used->workqueue,
                        sep_dequeuer, (void *)&sep_queue);

                if (u32_error) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "cant submit work sep_crypto_block\n");
                        sep_crypto_release(sctx, ta_ctx, -EINVAL);
                        return -EINVAL;
                }
        }

        /* Signal to crypto infrastructure and clear out */
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "hash update post op done\n");
        sep_crypto_release(sctx, ta_ctx, 0);
        return 0;
}

static u32 hash_final_post_op(struct sep_device *sep)
{
        int max_length;
        u32 u32_error;
        u32 msg_offset;
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(sep->current_hash_req);
        struct sep_system_ctx *sctx = crypto_ahash_ctx(tfm);
        struct this_task_ctx *ta_ctx = ahash_request_ctx(sep->current_hash_req);
        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "hash final post op\n");

        /* first bring msg from shared area to local area */
        memcpy(ta_ctx->msg, sep->shared_addr,
                SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        u32_error = sep_verify_op(ta_ctx, SEP_HASH_FINISH_OPCODE,
                &msg_offset);

        if (u32_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev, "hash finish error %x\n",
                        u32_error);
                sep_crypto_release(sctx, ta_ctx, u32_error);
                return u32_error;
                }

        /* Grab the result */
        if (ta_ctx->current_hash_req->result == NULL) {
                /* Oops, null buffer; error out here */
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "hash finish null buffer\n");
                sep_crypto_release(sctx, ta_ctx, (u32)-ENOMEM);
                return -ENOMEM;
                }

        max_length = (((SEP_HASH_RESULT_SIZE_WORDS * sizeof(u32)) + 3) /
                sizeof(u32)) * sizeof(u32);

        sep_read_msg(ta_ctx,
                ta_ctx->current_hash_req->result,
                crypto_ahash_digestsize(tfm), max_length,
                &msg_offset, 0);

        /* Signal to crypto infrastructure and clear out */
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "hash finish post op done\n");
        sep_crypto_release(sctx, ta_ctx, 0);
        return 0;
}

static u32 hash_digest_post_op(struct sep_device *sep)
{
        int max_length;
        u32 u32_error;
        u32 msg_offset;
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(sep->current_hash_req);
        struct sep_system_ctx *sctx = crypto_ahash_ctx(tfm);
        struct this_task_ctx *ta_ctx = ahash_request_ctx(sep->current_hash_req);
        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "hash digest post op\n");

        /* first bring msg from shared area to local area */
        memcpy(ta_ctx->msg, sep->shared_addr,
                SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        u32_error = sep_verify_op(ta_ctx, SEP_HASH_SINGLE_OPCODE,
                &msg_offset);

        if (u32_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "hash digest finish error %x\n", u32_error);

                sep_crypto_release(sctx, ta_ctx, u32_error);
                return u32_error;
                }

        /* Grab the result */
        if (ta_ctx->current_hash_req->result == NULL) {
                /* Oops, null buffer; error out here */
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "hash digest finish null buffer\n");
                sep_crypto_release(sctx, ta_ctx, (u32)-ENOMEM);
                return -ENOMEM;
                }

        max_length = (((SEP_HASH_RESULT_SIZE_WORDS * sizeof(u32)) + 3) /
                sizeof(u32)) * sizeof(u32);

        sep_read_msg(ta_ctx,
                ta_ctx->current_hash_req->result,
                crypto_ahash_digestsize(tfm), max_length,
                &msg_offset, 0);

        /* Signal to crypto infrastructure and clear out */
        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "hash digest finish post op done\n");

        sep_crypto_release(sctx, ta_ctx, 0);
        return 0;
}

/**
 * The sep_finish function is the function that is scheduled (via tasklet)
 * by the interrupt service routine when the SEP sends and interrupt
 * This is only called by the interrupt handler as a tasklet.
 */
static void sep_finish(unsigned long data)
{
        struct sep_device *sep_dev;
        int res;

        res = 0;

        if (data == 0) {
                pr_debug("sep_finish called with null data\n");
                return;
        }

        sep_dev = (struct sep_device *)data;
        if (sep_dev == NULL) {
                pr_debug("sep_finish; sep_dev is NULL\n");
                return;
        }

        if (sep_dev->in_kernel == (u32)0) {
                dev_warn(&sep_dev->pdev->dev,
                        "sep_finish; not in kernel operation\n");
                return;
        }

        /* Did we really do a sep command prior to this? */
        if (0 == test_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET,
                &sep_dev->ta_ctx->call_status.status)) {

                dev_warn(&sep_dev->pdev->dev, "[PID%d] sendmsg not called\n",
                        current->pid);
                return;
        }

        if (sep_dev->send_ct != sep_dev->reply_ct) {
                dev_warn(&sep_dev->pdev->dev,
                        "[PID%d] poll; no message came back\n",
                        current->pid);
                return;
        }

        /* Check for error (In case time ran out) */
        if ((res != 0x0) && (res != 0x8)) {
                dev_warn(&sep_dev->pdev->dev,
                        "[PID%d] poll; poll error GPR3 is %x\n",
                        current->pid, res);
                return;
        }

        /* What kind of interrupt from sep was this? */
        res = sep_read_reg(sep_dev, HW_HOST_SEP_HOST_GPR2_REG_ADDR);

        dev_dbg(&sep_dev->pdev->dev, "[PID%d] GPR2 at crypto finish is %x\n",
                current->pid, res);

        /* Print request? */
        if ((res >> 30) & 0x1) {
                dev_dbg(&sep_dev->pdev->dev, "[PID%d] sep print req\n",
                        current->pid);
                dev_dbg(&sep_dev->pdev->dev, "[PID%d] contents: %s\n",
                        current->pid,
                        (char *)(sep_dev->shared_addr +
                        SEP_DRIVER_PRINTF_OFFSET_IN_BYTES));
                return;
        }

        /* Request for daemon (not currently in POR)? */
        if (res >> 31) {
                dev_dbg(&sep_dev->pdev->dev,
                        "[PID%d] sep request; ignoring\n",
                        current->pid);
                return;
        }

        /* If we got here, then we have a replay to a sep command */

        dev_dbg(&sep_dev->pdev->dev,
                "[PID%d] sep reply to command; processing request: %x\n",
                current->pid, sep_dev->current_request);

        switch (sep_dev->current_request) {
        case AES_CBC:
        case AES_ECB:

        case DES_CBC:
        case DES_ECB:
                res = crypto_post_op(sep_dev);
                break;
        case SHA1:
        case MD5:
        case SHA224:
        case SHA256:
                switch (sep_dev->current_hash_stage) {
                case HASH_INIT:
                        res = hash_init_post_op(sep_dev);
                        break;
                case HASH_UPDATE:
                case HASH_FINUP_DATA:
                        res = hash_update_post_op(sep_dev);
                        break;
                case HASH_FINUP_FINISH:
                case HASH_FINISH:
                        res = hash_final_post_op(sep_dev);
                        break;
                case HASH_DIGEST:
                        res = hash_digest_post_op(sep_dev);
                        break;
                default:
                        pr_debug("sep - invalid stage for hash finish\n");
                }
                break;
        default:
                pr_debug("sep - invalid request for finish\n");
        }

        if (res)
                pr_debug("sep - finish returned error %x\n", res);
}

static int sep_hash_cra_init(struct crypto_tfm *tfm)
        {
        const char *alg_name = crypto_tfm_alg_name(tfm);

        pr_debug("sep_hash_cra_init name is %s\n", alg_name);

        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                sizeof(struct this_task_ctx));
        return 0;
        }

static void sep_hash_cra_exit(struct crypto_tfm *tfm)
{
        pr_debug("sep_hash_cra_exit\n");
}

static void sep_hash_init(void *data)
{
        u32 msg_offset;
        int result;
        struct ahash_request *req;
        struct crypto_ahash *tfm;
        struct this_task_ctx *ta_ctx;
        struct sep_system_ctx *sctx;
        unsigned long end_time;
        int are_we_done_yet;

        req = (struct ahash_request *)data;
        tfm = crypto_ahash_reqtfm(req);
        sctx = crypto_ahash_ctx(tfm);
        ta_ctx = ahash_request_ctx(req);
        ta_ctx->sep_used = sep_dev;

        ta_ctx->are_we_done_yet = &are_we_done_yet;

        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "sep_hash_init\n");
        ta_ctx->current_hash_stage = HASH_INIT;
        /* opcode and mode */
        sep_make_header(ta_ctx, &msg_offset, SEP_HASH_INIT_OPCODE);
        sep_write_msg(ta_ctx, &ta_ctx->hash_opmode,
                sizeof(u32), sizeof(u32), &msg_offset, 0);
        sep_end_msg(ta_ctx, msg_offset);

        are_we_done_yet = 0;
        result = sep_crypto_take_sep(ta_ctx);
        if (result) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "sep_hash_init take sep failed\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
        }

        /* now we sit and wait up to a fixed time for completion */
        end_time = jiffies + (WAIT_TIME * HZ);
        while ((time_before(jiffies, end_time)) && (are_we_done_yet == 0))
                schedule();

        /* Done waiting; still not done yet? */
        if (are_we_done_yet == 0) {
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "hash init never got done\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

}

static void sep_hash_update(void *data)
{
        int int_error;
        u32 msg_offset;
        u32 len;
        struct sep_hash_internal_context *int_ctx;
        u32 block_size;
        u32 head_len;
        u32 tail_len;
        int are_we_done_yet;

        static u32 msg[10];
        static char small_buf[100];
        void *src_ptr;
        struct scatterlist *new_sg;
        ssize_t copy_result;
        struct ahash_request *req;
        struct crypto_ahash *tfm;
        struct this_task_ctx *ta_ctx;
        struct sep_system_ctx *sctx;
        unsigned long end_time;

        req = (struct ahash_request *)data;
        tfm = crypto_ahash_reqtfm(req);
        sctx = crypto_ahash_ctx(tfm);
        ta_ctx = ahash_request_ctx(req);
        ta_ctx->sep_used = sep_dev;

        ta_ctx->are_we_done_yet = &are_we_done_yet;

        /* length for queue status */
        ta_ctx->nbytes = req->nbytes;

        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "sep_hash_update\n");
        ta_ctx->current_hash_stage = HASH_UPDATE;
        len = req->nbytes;

        block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
        tail_len = req->nbytes % block_size;
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "length is %x\n", len);
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "block_size is %x\n", block_size);
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "tail len is %x\n", tail_len);

        /* Compute header/tail sizes */
        int_ctx = (struct sep_hash_internal_context *)&sctx->
                hash_private_ctx.internal_context;
        head_len = (block_size - int_ctx->prev_update_bytes) % block_size;
        tail_len = (req->nbytes - head_len) % block_size;

        /* Make sure all pages are an even block */
        int_error = sep_oddball_pages(ta_ctx->sep_used, req->src,
                req->nbytes,
                block_size, &new_sg, 1);

        if (int_error < 0) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "oddball pages error in crash update\n");
                sep_crypto_release(sctx, ta_ctx, -ENOMEM);
                return;
        } else if (int_error == 1) {
                ta_ctx->src_sg = new_sg;
                ta_ctx->src_sg_hold = new_sg;
        } else {
                ta_ctx->src_sg = req->src;
                ta_ctx->src_sg_hold = NULL;
        }

        src_ptr = sg_virt(ta_ctx->src_sg);

        if ((!req->nbytes) || (!ta_ctx->src_sg)) {
                /* null data */
                src_ptr = NULL;
        }

        ta_ctx->dcb_input_data.app_in_address = src_ptr;
        ta_ctx->dcb_input_data.data_in_size =
                req->nbytes - (head_len + tail_len);
        ta_ctx->dcb_input_data.app_out_address = NULL;
        ta_ctx->dcb_input_data.block_size = block_size;
        ta_ctx->dcb_input_data.tail_block_size = 0;
        ta_ctx->dcb_input_data.is_applet = 0;
        ta_ctx->dcb_input_data.src_sg = ta_ctx->src_sg;
        ta_ctx->dcb_input_data.dst_sg = NULL;

        int_error = sep_create_dcb_dmatables_context_kernel(
                ta_ctx->sep_used,
                &ta_ctx->dcb_region,
                &ta_ctx->dmatables_region,
                &ta_ctx->dma_ctx,
                &ta_ctx->dcb_input_data,
                1);
        if (int_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "hash update dma table create failed\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

        /* Construct message to SEP */
        sep_make_header(ta_ctx, &msg_offset, SEP_HASH_UPDATE_OPCODE);

        msg[0] = (u32)0;
        msg[1] = (u32)0;
        msg[2] = (u32)0;

        sep_write_msg(ta_ctx, msg, sizeof(u32) * 3, sizeof(u32) * 3,
                &msg_offset, 0);

        /* Handle remainders */

        /* Head */
        sep_write_msg(ta_ctx, &head_len, sizeof(u32),
                sizeof(u32), &msg_offset, 0);

        if (head_len) {
                copy_result = sg_copy_to_buffer(
                        req->src,
                        sep_sg_nents(ta_ctx->src_sg),
                        small_buf, head_len);

                if (copy_result != head_len) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "sg head copy failure in hash block\n");
                        sep_crypto_release(sctx, ta_ctx, -ENOMEM);
                        return;
                }

                sep_write_msg(ta_ctx, small_buf, head_len,
                        sizeof(u32) * 32, &msg_offset, 1);
        } else {
                msg_offset += sizeof(u32) * 32;
        }

        /* Tail */
        sep_write_msg(ta_ctx, &tail_len, sizeof(u32),
                sizeof(u32), &msg_offset, 0);

        if (tail_len) {
                copy_result = sep_copy_offset_sg(
                        ta_ctx->sep_used,
                        ta_ctx->src_sg,
                        req->nbytes - tail_len,
                        small_buf, tail_len);

                if (copy_result != tail_len) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "sg tail copy failure in hash block\n");
                        sep_crypto_release(sctx, ta_ctx, -ENOMEM);
                        return;
                }

                sep_write_msg(ta_ctx, small_buf, tail_len,
                        sizeof(u32) * 32, &msg_offset, 1);
        } else {
                msg_offset += sizeof(u32) * 32;
        }

        /* Context */
        sep_write_context(ta_ctx, &msg_offset, &sctx->hash_private_ctx,
                sizeof(struct sep_hash_private_context));

        sep_end_msg(ta_ctx, msg_offset);
        are_we_done_yet = 0;
        int_error = sep_crypto_take_sep(ta_ctx);
        if (int_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "sep_hash_update take sep failed\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
        }

        /* now we sit and wait up to a fixed time for completion */
        end_time = jiffies + (WAIT_TIME * HZ);
        while ((time_before(jiffies, end_time)) && (are_we_done_yet == 0))
                schedule();

        /* Done waiting; still not done yet? */
        if (are_we_done_yet == 0) {
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "hash update never got done\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

}

static void sep_hash_final(void *data)
{
        u32 msg_offset;
        struct ahash_request *req;
        struct crypto_ahash *tfm;
        struct this_task_ctx *ta_ctx;
        struct sep_system_ctx *sctx;
        int result;
        unsigned long end_time;
        int are_we_done_yet;

        req = (struct ahash_request *)data;
        tfm = crypto_ahash_reqtfm(req);
        sctx = crypto_ahash_ctx(tfm);
        ta_ctx = ahash_request_ctx(req);
        ta_ctx->sep_used = sep_dev;

        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "sep_hash_final\n");
        ta_ctx->current_hash_stage = HASH_FINISH;

        ta_ctx->are_we_done_yet = &are_we_done_yet;

        /* opcode and mode */
        sep_make_header(ta_ctx, &msg_offset, SEP_HASH_FINISH_OPCODE);

        /* Context */
        sep_write_context(ta_ctx, &msg_offset, &sctx->hash_private_ctx,
                sizeof(struct sep_hash_private_context));

        sep_end_msg(ta_ctx, msg_offset);
        are_we_done_yet = 0;
        result = sep_crypto_take_sep(ta_ctx);
        if (result) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "sep_hash_final take sep failed\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
        }

        /* now we sit and wait up to a fixed time for completion */
        end_time = jiffies + (WAIT_TIME * HZ);
        while ((time_before(jiffies, end_time)) && (are_we_done_yet == 0))
                schedule();

        /* Done waiting; still not done yet? */
        if (are_we_done_yet == 0) {
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "hash final job never got done\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

}

static void sep_hash_digest(void *data)
{
        int int_error;
        u32 msg_offset;
        u32 block_size;
        u32 msg[10];
        size_t copy_result;
        int result;
        int are_we_done_yet;
        u32 tail_len;
        static char small_buf[100];
        struct scatterlist *new_sg;
        void *src_ptr;

        struct ahash_request *req;
        struct crypto_ahash *tfm;
        struct this_task_ctx *ta_ctx;
        struct sep_system_ctx *sctx;
        unsigned long end_time;

        req = (struct ahash_request *)data;
        tfm = crypto_ahash_reqtfm(req);
        sctx = crypto_ahash_ctx(tfm);
        ta_ctx = ahash_request_ctx(req);
        ta_ctx->sep_used = sep_dev;

        dev_dbg(&ta_ctx->sep_used->pdev->dev,
                "sep_hash_digest\n");
        ta_ctx->current_hash_stage = HASH_DIGEST;

        ta_ctx->are_we_done_yet = &are_we_done_yet;

        /* length for queue status */
        ta_ctx->nbytes = req->nbytes;

        block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
        tail_len = req->nbytes % block_size;
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "length is %x\n", req->nbytes);
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "block_size is %x\n", block_size);
        dev_dbg(&ta_ctx->sep_used->pdev->dev, "tail len is %x\n", tail_len);

        /* Make sure all pages are an even block */
        int_error = sep_oddball_pages(ta_ctx->sep_used, req->src,
                req->nbytes,
                block_size, &new_sg, 1);

        if (int_error < 0) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "oddball pages error in crash update\n");
                sep_crypto_release(sctx, ta_ctx, -ENOMEM);
                return;
        } else if (int_error == 1) {
                ta_ctx->src_sg = new_sg;
                ta_ctx->src_sg_hold = new_sg;
        } else {
                ta_ctx->src_sg = req->src;
                ta_ctx->src_sg_hold = NULL;
        }

        src_ptr = sg_virt(ta_ctx->src_sg);

        if ((!req->nbytes) || (!ta_ctx->src_sg)) {
                /* null data */
                src_ptr = NULL;
        }

        ta_ctx->dcb_input_data.app_in_address = src_ptr;
        ta_ctx->dcb_input_data.data_in_size = req->nbytes - tail_len;
        ta_ctx->dcb_input_data.app_out_address = NULL;
        ta_ctx->dcb_input_data.block_size = block_size;
        ta_ctx->dcb_input_data.tail_block_size = 0;
        ta_ctx->dcb_input_data.is_applet = 0;
        ta_ctx->dcb_input_data.src_sg = ta_ctx->src_sg;
        ta_ctx->dcb_input_data.dst_sg = NULL;

        int_error = sep_create_dcb_dmatables_context_kernel(
                ta_ctx->sep_used,
                &ta_ctx->dcb_region,
                &ta_ctx->dmatables_region,
                &ta_ctx->dma_ctx,
                &ta_ctx->dcb_input_data,
                1);
        if (int_error) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "hash update dma table create failed\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

        /* Construct message to SEP */
        sep_make_header(ta_ctx, &msg_offset, SEP_HASH_SINGLE_OPCODE);
        sep_write_msg(ta_ctx, &ta_ctx->hash_opmode,
                sizeof(u32), sizeof(u32), &msg_offset, 0);

        msg[0] = (u32)0;
        msg[1] = (u32)0;
        msg[2] = (u32)0;

        sep_write_msg(ta_ctx, msg, sizeof(u32) * 3, sizeof(u32) * 3,
                &msg_offset, 0);

        /* Tail */
        sep_write_msg(ta_ctx, &tail_len, sizeof(u32),
                sizeof(u32), &msg_offset, 0);

        if (tail_len) {
                copy_result = sep_copy_offset_sg(
                        ta_ctx->sep_used,
                        ta_ctx->src_sg,
                        req->nbytes - tail_len,
                        small_buf, tail_len);

                if (copy_result != tail_len) {
                        dev_warn(&ta_ctx->sep_used->pdev->dev,
                                "sg tail copy failure in hash block\n");
                        sep_crypto_release(sctx, ta_ctx, -ENOMEM);
                        return;
                }

                sep_write_msg(ta_ctx, small_buf, tail_len,
                        sizeof(u32) * 32, &msg_offset, 1);
        } else {
                msg_offset += sizeof(u32) * 32;
        }

        sep_end_msg(ta_ctx, msg_offset);

        are_we_done_yet = 0;
        result = sep_crypto_take_sep(ta_ctx);
        if (result) {
                dev_warn(&ta_ctx->sep_used->pdev->dev,
                        "sep_hash_digest take sep failed\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
        }

        /* now we sit and wait up to a fixed time for completion */
        end_time = jiffies + (WAIT_TIME * HZ);
        while ((time_before(jiffies, end_time)) && (are_we_done_yet == 0))
                schedule();

        /* Done waiting; still not done yet? */
        if (are_we_done_yet == 0) {
                dev_dbg(&ta_ctx->sep_used->pdev->dev,
                        "hash digest job never got done\n");
                sep_crypto_release(sctx, ta_ctx, -EINVAL);
                return;
        }

}

/**
 * This is what is called by each of the API's provided
 * in the kernel crypto descriptors. It is run in a process
 * context using the kernel workqueues. Therefore it can
 * be put to sleep.
 */
static void sep_dequeuer(void *data)
{
        struct crypto_queue *this_queue;
        struct crypto_async_request *async_req;
        struct crypto_async_request *backlog;
        struct ablkcipher_request *cypher_req;
        struct ahash_request *hash_req;
        struct sep_system_ctx *sctx;
        struct crypto_ahash *hash_tfm;
        struct this_task_ctx *ta_ctx;


        this_queue = (struct crypto_queue *)data;

        spin_lock_irq(&queue_lock);
        backlog = crypto_get_backlog(this_queue);
        async_req = crypto_dequeue_request(this_queue);
        spin_unlock_irq(&queue_lock);

        if (!async_req) {
                pr_debug("sep crypto queue is empty\n");
                return;
        }

        if (backlog) {
                pr_debug("sep crypto backlog set\n");
                if (backlog->complete)
                        backlog->complete(backlog, -EINPROGRESS);
                backlog = NULL;
        }

        if (!async_req->tfm) {
                pr_debug("sep crypto queue null tfm\n");
                return;
        }

        if (!async_req->tfm->__crt_alg) {
                pr_debug("sep crypto queue null __crt_alg\n");
                return;
        }

        if (!async_req->tfm->__crt_alg->cra_type) {
                pr_debug("sep crypto queue null cra_type\n");
                return;
        }

        /* we have stuff in the queue */
        if (async_req->tfm->__crt_alg->cra_type !=
                &crypto_ahash_type) {
                /* This is for a cypher */
                pr_debug("sep crypto queue doing cipher\n");
                cypher_req = container_of(async_req,
                        struct ablkcipher_request,
                        base);
                if (!cypher_req) {
                        pr_debug("sep crypto queue null cypher_req\n");
                        return;
                }

                sep_crypto_block((void *)cypher_req);
                return;
        } else {
                /* This is a hash */
                pr_debug("sep crypto queue doing hash\n");
                /**
                 * This is a bit more complex than cipher; we
                 * need to figure out what type of operation
                 */
                hash_req = ahash_request_cast(async_req);
                if (!hash_req) {
                        pr_debug("sep crypto queue null hash_req\n");
                        return;
                }

                hash_tfm = crypto_ahash_reqtfm(hash_req);
                if (!hash_tfm) {
                        pr_debug("sep crypto queue null hash_tfm\n");
                        return;
                }


                sctx = crypto_ahash_ctx(hash_tfm);
                if (!sctx) {
                        pr_debug("sep crypto queue null sctx\n");
                        return;
                }

                ta_ctx = ahash_request_ctx(hash_req);

                if (ta_ctx->current_hash_stage == HASH_INIT) {
                        pr_debug("sep crypto queue hash init\n");
                        sep_hash_init((void *)hash_req);
                        return;
                } else if (ta_ctx->current_hash_stage == HASH_UPDATE) {
                        pr_debug("sep crypto queue hash update\n");
                        sep_hash_update((void *)hash_req);
                        return;
                } else if (ta_ctx->current_hash_stage == HASH_FINISH) {
                        pr_debug("sep crypto queue hash final\n");
                        sep_hash_final((void *)hash_req);
                        return;
                } else if (ta_ctx->current_hash_stage == HASH_DIGEST) {
                        pr_debug("sep crypto queue hash digest\n");
                        sep_hash_digest((void *)hash_req);
                        return;
                } else if (ta_ctx->current_hash_stage == HASH_FINUP_DATA) {
                        pr_debug("sep crypto queue hash digest\n");
                        sep_hash_update((void *)hash_req);
                        return;
                } else if (ta_ctx->current_hash_stage == HASH_FINUP_FINISH) {
                        pr_debug("sep crypto queue hash digest\n");
                        sep_hash_final((void *)hash_req);
                        return;
                } else {
                        pr_debug("sep crypto queue hash oops nothing\n");
                        return;
                }
        }
}

static int sep_sha1_init(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);

        pr_debug("sep - doing sha1 init\n");

        /* Clear out task context */
        memset(ta_ctx, 0, sizeof(struct this_task_ctx));

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA1;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA1;
        ta_ctx->current_hash_stage = HASH_INIT;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_sha1_update(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);

        pr_debug("sep - doing sha1 update\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA1;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA1;
        ta_ctx->current_hash_stage = HASH_UPDATE;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_sha1_final(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing sha1 final\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA1;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA1;
        ta_ctx->current_hash_stage = HASH_FINISH;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_sha1_digest(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing sha1 digest\n");

        /* Clear out task context */
        memset(ta_ctx, 0, sizeof(struct this_task_ctx));

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA1;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA1;
        ta_ctx->current_hash_stage = HASH_DIGEST;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_sha1_finup(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing sha1 finup\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA1;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA1;
        ta_ctx->current_hash_stage = HASH_FINUP_DATA;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_md5_init(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing md5 init\n");

        /* Clear out task context */
        memset(ta_ctx, 0, sizeof(struct this_task_ctx));

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = MD5;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_MD5;
        ta_ctx->current_hash_stage = HASH_INIT;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_md5_update(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing md5 update\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = MD5;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_MD5;
        ta_ctx->current_hash_stage = HASH_UPDATE;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_md5_final(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing md5 final\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = MD5;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_MD5;
        ta_ctx->current_hash_stage = HASH_FINISH;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_md5_digest(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);

        pr_debug("sep - doing md5 digest\n");

        /* Clear out task context */
        memset(ta_ctx, 0, sizeof(struct this_task_ctx));

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = MD5;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_MD5;
        ta_ctx->current_hash_stage = HASH_DIGEST;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_md5_finup(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);

        pr_debug("sep - doing md5 finup\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = MD5;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_MD5;
        ta_ctx->current_hash_stage = HASH_FINUP_DATA;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_sha224_init(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing sha224 init\n");

        /* Clear out task context */
        memset(ta_ctx, 0, sizeof(struct this_task_ctx));

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA224;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA224;
        ta_ctx->current_hash_stage = HASH_INIT;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,
                sep_dequeuer, (void *)&sep_queue);
        if (error1)
                pr_debug(" sep - workqueue submit failed: %x\n",
                        error1);
        spin_unlock_irq(&queue_lock);
        /* We return result of crypto enqueue */
        return error;
}

static int sep_sha224_update(struct ahash_request *req)
{
        int error;
        int error1;
        struct this_task_ctx *ta_ctx = ahash_request_ctx(req);
        pr_debug("sep - doing sha224 update\n");

        ta_ctx->sep_used = sep_dev;
        ta_ctx->current_request = SHA224;
        ta_ctx->current_hash_req = req;
        ta_ctx->current_cypher_req = NULL;
        ta_ctx->hash_opmode = SEP_HASH_SHA224;
        ta_ctx->current_hash_stage = HASH_UPDATE;

        /* lock necessary so that only one entity touches the queues */
        spin_lock_irq(&queue_lock);
        error = crypto_enqueue_request(&sep_queue, &req->base);

        if ((error != 0) && (error != -EINPROGRESS))
                pr_debug(" sep - crypto enqueue failed: %x\n",
                        error);
        error1 = sep_submit_work(ta_ctx->sep_used->workqueue,